/* Machine independent support for SVR4 /proc (process file system) for GDB.
- Copyright (C) 1991 Free Software Foundation, Inc.
+ Copyright 1991, 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
Written by Fred Fish at Cygnus Support.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* N O T E S
*/
-
#include "defs.h"
-#ifdef USE_PROC_FS /* Entire file goes away if not using /proc */
-
-#include <stdio.h>
+#include <sys/types.h>
+#include <time.h>
+#include <sys/fault.h>
+#include <sys/syscall.h>
#include <sys/procfs.h>
#include <fcntl.h>
#include <errno.h>
+#include "gdb_string.h"
+#include <stropts.h>
+#include <poll.h>
+#include <unistd.h>
+#include "gdb_stat.h"
-#include "ansidecl.h"
#include "inferior.h"
#include "target.h"
+#include "command.h"
+#include "gdbcore.h"
+#include "gdbthread.h"
+
+#define MAX_SYSCALLS 256 /* Maximum number of syscalls for table */
#ifndef PROC_NAME_FMT
-#define PROC_NAME_FMT "/proc/%d"
+#define PROC_NAME_FMT "/proc/%05d"
#endif
-extern void EXFUN(supply_gregset, (gregset_t *gregsetp));
-extern void EXFUN(fill_gregset, (gregset_t *gresetp, int regno));
+extern struct target_ops procfs_ops; /* Forward declaration */
-#if defined (FP0_REGNUM)
-extern void EXFUN(supply_fpregset, (fpregset_t *fpregsetp));
-extern void EXFUN(fill_fpregset, (fpregset_t *fpresetp, int regno));
-#endif
+int procfs_suppress_run = 0; /* Non-zero if procfs should pretend not to
+ be a runnable target. Used by targets
+ that can sit atop procfs, such as solaris
+ thread support. */
#if 1 /* FIXME: Gross and ugly hack to resolve coredep.c global */
CORE_ADDR kernel_u_addr;
#endif
+#ifdef BROKEN_SIGINFO_H /* Workaround broken SGS <sys/siginfo.h> */
+#undef si_pid
+#define si_pid _data._proc.pid
+#undef si_uid
+#define si_uid _data._proc._pdata._kill.uid
+#endif /* BROKEN_SIGINFO_H */
+
/* All access to the inferior, either one started by gdb or one that has
been attached to, is controlled by an instance of a procinfo structure,
defined below. Since gdb currently only handles one inferior at a time,
- the procinfo structure is statically allocated and only one exists at
- any given time. */
+ the procinfo structure for the inferior is statically allocated and
+ only one exists at any given time. There is a separate procinfo
+ structure for use by the "info proc" command, so that we can print
+ useful information about any random process without interfering with
+ the inferior's procinfo information. */
struct procinfo {
- int valid; /* Nonzero if pid, fd, & pathname are valid */
+ struct procinfo *next;
int pid; /* Process ID of inferior */
int fd; /* File descriptor for /proc entry */
char *pathname; /* Pathname to /proc entry */
+ int had_event; /* poll/select says something happened */
int was_stopped; /* Nonzero if was stopped prior to attach */
+ int nopass_next_sigstop; /* Don't pass a sigstop on next resume */
prrun_t prrun; /* Control state when it is run */
prstatus_t prstatus; /* Current process status info */
gregset_t gregset; /* General register set */
sigset_t trace; /* Current traced signal set */
sysset_t exitset; /* Current traced system call exit set */
sysset_t entryset; /* Current traced system call entry set */
-} pi;
-
-/* Forward declarations of static functions so we don't have to worry
- about ordering within this file. The EXFUN macro may be slightly
- misleading. Should probably be called DCLFUN instead, or something
- more intuitive, since it can be used for both static and external
- definitions. */
+ fltset_t saved_fltset; /* Saved traced hardware fault set */
+ sigset_t saved_trace; /* Saved traced signal set */
+ sigset_t saved_sighold; /* Saved held signal set */
+ sysset_t saved_exitset; /* Saved traced system call exit set */
+ sysset_t saved_entryset; /* Saved traced system call entry set */
+ int num_syscall_handlers; /* Number of syscall handlers currently installed */
+ struct procfs_syscall_handler *syscall_handlers; /* Pointer to list of syscall trap handlers */
+ int new_child; /* Non-zero if it's a new thread */
+};
+
+/* List of inferior process information */
+static struct procinfo *procinfo_list = NULL;
+
+static struct pollfd *poll_list; /* pollfds used for waiting on /proc */
+
+static int num_poll_list = 0; /* Number of entries in poll_list */
+
+/* Much of the information used in the /proc interface, particularly for
+ printing status information, is kept as tables of structures of the
+ following form. These tables can be used to map numeric values to
+ their symbolic names and to a string that describes their specific use. */
+
+struct trans {
+ int value; /* The numeric value */
+ char *name; /* The equivalent symbolic value */
+ char *desc; /* Short description of value */
+};
+
+/* Translate bits in the pr_flags member of the prstatus structure, into the
+ names and desc information. */
+
+static struct trans pr_flag_table[] =
+{
+#if defined (PR_STOPPED)
+ { PR_STOPPED, "PR_STOPPED", "Process is stopped" },
+#endif
+#if defined (PR_ISTOP)
+ { PR_ISTOP, "PR_ISTOP", "Stopped on an event of interest" },
+#endif
+#if defined (PR_DSTOP)
+ { PR_DSTOP, "PR_DSTOP", "A stop directive is in effect" },
+#endif
+#if defined (PR_ASLEEP)
+ { PR_ASLEEP, "PR_ASLEEP", "Sleeping in an interruptible system call" },
+#endif
+#if defined (PR_FORK)
+ { PR_FORK, "PR_FORK", "Inherit-on-fork is in effect" },
+#endif
+#if defined (PR_RLC)
+ { PR_RLC, "PR_RLC", "Run-on-last-close is in effect" },
+#endif
+#if defined (PR_PTRACE)
+ { PR_PTRACE, "PR_PTRACE", "Process is being controlled by ptrace" },
+#endif
+#if defined (PR_PCINVAL)
+ { PR_PCINVAL, "PR_PCINVAL", "PC refers to an invalid virtual address" },
+#endif
+#if defined (PR_ISSYS)
+ { PR_ISSYS, "PR_ISSYS", "Is a system process" },
+#endif
+#if defined (PR_STEP)
+ { PR_STEP, "PR_STEP", "Process has single step pending" },
+#endif
+#if defined (PR_KLC)
+ { PR_KLC, "PR_KLC", "Kill-on-last-close is in effect" },
+#endif
+#if defined (PR_ASYNC)
+ { PR_ASYNC, "PR_ASYNC", "Asynchronous stop is in effect" },
+#endif
+#if defined (PR_PCOMPAT)
+ { PR_PCOMPAT, "PR_PCOMPAT", "Ptrace compatibility mode in effect" },
+#endif
+ { 0, NULL, NULL }
+};
-static void EXFUN(proc_init_failed, (char *why));
-static int EXFUN(open_proc_file, (int pid));
-static void EXFUN(close_proc_file, (void));
-static void EXFUN(unconditionally_kill_inferior, (void));
+/* Translate values in the pr_why field of the prstatus struct. */
-/*
+static struct trans pr_why_table[] =
+{
+#if defined (PR_REQUESTED)
+ { PR_REQUESTED, "PR_REQUESTED", "Directed to stop via PIOCSTOP/PIOCWSTOP" },
+#endif
+#if defined (PR_SIGNALLED)
+ { PR_SIGNALLED, "PR_SIGNALLED", "Receipt of a traced signal" },
+#endif
+#if defined (PR_FAULTED)
+ { PR_FAULTED, "PR_FAULTED", "Incurred a traced hardware fault" },
+#endif
+#if defined (PR_SYSENTRY)
+ { PR_SYSENTRY, "PR_SYSENTRY", "Entry to a traced system call" },
+#endif
+#if defined (PR_SYSEXIT)
+ { PR_SYSEXIT, "PR_SYSEXIT", "Exit from a traced system call" },
+#endif
+#if defined (PR_JOBCONTROL)
+ { PR_JOBCONTROL, "PR_JOBCONTROL", "Default job control stop signal action" },
+#endif
+#if defined (PR_SUSPENDED)
+ { PR_SUSPENDED, "PR_SUSPENDED", "Process suspended" },
+#endif
+ { 0, NULL, NULL }
+};
-GLOBAL FUNCTION
+/* Hardware fault translation table. */
- ptrace -- override library version to force errors for /proc version
+static struct trans faults_table[] =
+{
+#if defined (FLTILL)
+ { FLTILL, "FLTILL", "Illegal instruction" },
+#endif
+#if defined (FLTPRIV)
+ { FLTPRIV, "FLTPRIV", "Privileged instruction" },
+#endif
+#if defined (FLTBPT)
+ { FLTBPT, "FLTBPT", "Breakpoint trap" },
+#endif
+#if defined (FLTTRACE)
+ { FLTTRACE, "FLTTRACE", "Trace trap" },
+#endif
+#if defined (FLTACCESS)
+ { FLTACCESS, "FLTACCESS", "Memory access fault" },
+#endif
+#if defined (FLTBOUNDS)
+ { FLTBOUNDS, "FLTBOUNDS", "Memory bounds violation" },
+#endif
+#if defined (FLTIOVF)
+ { FLTIOVF, "FLTIOVF", "Integer overflow" },
+#endif
+#if defined (FLTIZDIV)
+ { FLTIZDIV, "FLTIZDIV", "Integer zero divide" },
+#endif
+#if defined (FLTFPE)
+ { FLTFPE, "FLTFPE", "Floating-point exception" },
+#endif
+#if defined (FLTSTACK)
+ { FLTSTACK, "FLTSTACK", "Unrecoverable stack fault" },
+#endif
+#if defined (FLTPAGE)
+ { FLTPAGE, "FLTPAGE", "Recoverable page fault" },
+#endif
+ { 0, NULL, NULL }
+};
-SYNOPSIS
+/* Translation table for signal generation information. See UNIX System
+ V Release 4 Programmer's Reference Manual, siginfo(5). */
- int ptrace (int request, int pid, int arg3, int arg4)
+static struct sigcode {
+ int signo;
+ int code;
+ char *codename;
+ char *desc;
+} siginfo_table[] = {
+#if defined (SIGILL) && defined (ILL_ILLOPC)
+ { SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode" },
+#endif
+#if defined (SIGILL) && defined (ILL_ILLOPN)
+ { SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand", },
+#endif
+#if defined (SIGILL) && defined (ILL_ILLADR)
+ { SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode" },
+#endif
+#if defined (SIGILL) && defined (ILL_ILLTRP)
+ { SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap" },
+#endif
+#if defined (SIGILL) && defined (ILL_PRVOPC)
+ { SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode" },
+#endif
+#if defined (SIGILL) && defined (ILL_PRVREG)
+ { SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register" },
+#endif
+#if defined (SIGILL) && defined (ILL_COPROC)
+ { SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error" },
+#endif
+#if defined (SIGILL) && defined (ILL_BADSTK)
+ { SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error" },
+#endif
+#if defined (SIGFPE) && defined (FPE_INTDIV)
+ { SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero" },
+#endif
+#if defined (SIGFPE) && defined (FPE_INTOVF)
+ { SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow" },
+#endif
+#if defined (SIGFPE) && defined (FPE_FLTDIV)
+ { SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating point divide by zero" },
+#endif
+#if defined (SIGFPE) && defined (FPE_FLTOVF)
+ { SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating point overflow" },
+#endif
+#if defined (SIGFPE) && defined (FPE_FLTUND)
+ { SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating point underflow" },
+#endif
+#if defined (SIGFPE) && defined (FPE_FLTRES)
+ { SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating point inexact result" },
+#endif
+#if defined (SIGFPE) && defined (FPE_FLTINV)
+ { SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating point operation" },
+#endif
+#if defined (SIGFPE) && defined (FPE_FLTSUB)
+ { SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range" },
+#endif
+#if defined (SIGSEGV) && defined (SEGV_MAPERR)
+ { SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object" },
+#endif
+#if defined (SIGSEGV) && defined (SEGV_ACCERR)
+ { SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for object" },
+#endif
+#if defined (SIGBUS) && defined (BUS_ADRALN)
+ { SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment" },
+#endif
+#if defined (SIGBUS) && defined (BUS_ADRERR)
+ { SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Non-existent physical address" },
+#endif
+#if defined (SIGBUS) && defined (BUS_OBJERR)
+ { SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object specific hardware error" },
+#endif
+#if defined (SIGTRAP) && defined (TRAP_BRKPT)
+ { SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint" },
+#endif
+#if defined (SIGTRAP) && defined (TRAP_TRACE)
+ { SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap" },
+#endif
+#if defined (SIGCLD) && defined (CLD_EXITED)
+ { SIGCLD, CLD_EXITED, "CLD_EXITED", "Child has exited" },
+#endif
+#if defined (SIGCLD) && defined (CLD_KILLED)
+ { SIGCLD, CLD_KILLED, "CLD_KILLED", "Child was killed" },
+#endif
+#if defined (SIGCLD) && defined (CLD_DUMPED)
+ { SIGCLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally" },
+#endif
+#if defined (SIGCLD) && defined (CLD_TRAPPED)
+ { SIGCLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped" },
+#endif
+#if defined (SIGCLD) && defined (CLD_STOPPED)
+ { SIGCLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped" },
+#endif
+#if defined (SIGCLD) && defined (CLD_CONTINUED)
+ { SIGCLD, CLD_CONTINUED, "CLD_CONTINUED", "Stopped child had continued" },
+#endif
+#if defined (SIGPOLL) && defined (POLL_IN)
+ { SIGPOLL, POLL_IN, "POLL_IN", "Input input available" },
+#endif
+#if defined (SIGPOLL) && defined (POLL_OUT)
+ { SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available" },
+#endif
+#if defined (SIGPOLL) && defined (POLL_MSG)
+ { SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available" },
+#endif
+#if defined (SIGPOLL) && defined (POLL_ERR)
+ { SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error" },
+#endif
+#if defined (SIGPOLL) && defined (POLL_PRI)
+ { SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available" },
+#endif
+#if defined (SIGPOLL) && defined (POLL_HUP)
+ { SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected" },
+#endif
+ { 0, 0, NULL, NULL }
+};
-DESCRIPTION
+static char *syscall_table[MAX_SYSCALLS];
- When gdb is configured to use /proc, it should not be calling
- or otherwise attempting to use ptrace. In order to catch errors
- where use of /proc is configured, but some routine is still calling
- ptrace, we provide a local version of a function with that name
- that does nothing but issue an error message.
-*/
+/* Prototypes for local functions */
-int
-DEFUN(ptrace, (request, pid, arg3, arg4),
- int request AND
- int pid AND
- int arg3 AND
- int arg4)
-{
- error ("internal error - there is a call to ptrace() somewhere");
- /*NOTREACHED*/
-}
+static void procfs_stop PARAMS ((void));
-/*
+static int procfs_thread_alive PARAMS ((int));
-GLOBAL FUNCTION
+static int procfs_can_run PARAMS ((void));
- kill_inferior_fast -- kill inferior while gdb is exiting
+static void procfs_mourn_inferior PARAMS ((void));
-SYNOPSIS
+static void procfs_fetch_registers PARAMS ((int));
- void kill_inferior_fast (void)
+static int procfs_wait PARAMS ((int, struct target_waitstatus *));
-DESCRIPTION
+static void procfs_open PARAMS ((char *, int));
- This is used when GDB is exiting. It gives less chance of error.
+static void procfs_files_info PARAMS ((struct target_ops *));
-NOTES
+static void procfs_prepare_to_store PARAMS ((void));
- Don't attempt to kill attached inferiors since we may be called
- when gdb is in the process of aborting, and killing the attached
- inferior may be very anti-social. This is particularly true if we
- were attached just so we could use the /proc facilities to get
- detailed information about it's status.
+static void procfs_detach PARAMS ((char *, int));
-*/
+static void procfs_attach PARAMS ((char *, int));
-void
-DEFUN_VOID(kill_inferior_fast)
-{
- if (inferior_pid != 0 && !attach_flag)
- {
- unconditionally_kill_inferior ();
- }
-}
+static void proc_set_exec_trap PARAMS ((void));
-/*
+static int procfs_init_inferior PARAMS ((int));
-GLOBAL FUNCTION
+static struct procinfo *create_procinfo PARAMS ((int));
- kill_inferior - kill any currently inferior
+static void procfs_store_registers PARAMS ((int));
-SYNOPSIS
+static int procfs_xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
- void kill_inferior (void)
+static void procfs_kill_inferior PARAMS ((void));
-DESCRIPTION
+static char *sigcodedesc PARAMS ((siginfo_t *));
- Kill any current inferior.
+static char *sigcodename PARAMS ((siginfo_t *));
-NOTES
+static struct procinfo *wait_fd PARAMS ((void));
- Kills even attached inferiors. Presumably the user has already
- been prompted that the inferior is an attached one rather than
- one started by gdb. (FIXME?)
+static void remove_fd PARAMS ((struct procinfo *));
-*/
+static void add_fd PARAMS ((struct procinfo *));
-void
-DEFUN_VOID(kill_inferior)
-{
- if (inferior_pid != 0)
- {
- unconditionally_kill_inferior ();
- target_mourn_inferior ();
- }
-}
+static void set_proc_siginfo PARAMS ((struct procinfo *, int));
-/*
+static void init_syscall_table PARAMS ((void));
-LOCAL FUNCTION
+static char *syscallname PARAMS ((int));
- unconditionally_kill_inferior - terminate the inferior
+static char *signalname PARAMS ((int));
-SYNOPSIS
+static char *errnoname PARAMS ((int));
- static void unconditionally_kill_inferior (void)
+static int proc_address_to_fd PARAMS ((struct procinfo *, CORE_ADDR, int));
-DESCRIPTION
+static int open_proc_file PARAMS ((int, struct procinfo *, int));
- Kill the current inferior. Should not be called until it
- is at least tested that there is an inferior.
+static void close_proc_file PARAMS ((struct procinfo *));
-NOTE
+static void unconditionally_kill_inferior PARAMS ((struct procinfo *));
- A possibly useful enhancement would be to first try sending
- the inferior a terminate signal, politely asking it to commit
- suicide, before we murder it.
+static NORETURN void proc_init_failed PARAMS ((struct procinfo *, char *)) ATTR_NORETURN;
-*/
+static void info_proc PARAMS ((char *, int));
-static void
-DEFUN_VOID(unconditionally_kill_inferior)
-{
- int signo;
-
- signo = SIGKILL;
- (void) ioctl (pi.fd, PIOCKILL, &signo);
- close_proc_file ();
- wait ((int *) 0);
-}
+static void info_proc_flags PARAMS ((struct procinfo *, int));
-/*
+static void info_proc_stop PARAMS ((struct procinfo *, int));
-GLOBAL FUNCTION
+static void info_proc_siginfo PARAMS ((struct procinfo *, int));
- child_xfer_memory -- copy data to or from inferior memory space
+static void info_proc_syscalls PARAMS ((struct procinfo *, int));
-SYNOPSIS
+static void info_proc_mappings PARAMS ((struct procinfo *, int));
- int child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
- int dowrite, struct target_ops target)
+static void info_proc_signals PARAMS ((struct procinfo *, int));
-DESCRIPTION
+static void info_proc_faults PARAMS ((struct procinfo *, int));
- Copy LEN bytes to/from inferior's memory starting at MEMADDR
- from/to debugger memory starting at MYADDR. Copy from inferior
- if DOWRITE is zero or to inferior if DOWRITE is nonzero.
-
- Returns the length copied, which is either the LEN argument or
- zero. This xfer function does not do partial moves, since child_ops
- doesn't allow memory operations to cross below us in the target stack
- anyway.
+static char *mappingflags PARAMS ((long));
-NOTES
+static char *lookupname PARAMS ((struct trans *, unsigned int, char *));
- The /proc interface makes this an almost trivial task.
- */
+static char *lookupdesc PARAMS ((struct trans *, unsigned int));
+static int do_attach PARAMS ((int pid));
-int
-DEFUN(child_xfer_memory, (memaddr, myaddr, len, dowrite, target),
- CORE_ADDR memaddr AND
- char *myaddr AND
- int len AND
- int dowrite AND
- struct target_ops target /* ignored */)
-{
- int nbytes = 0;
+static void do_detach PARAMS ((int siggnal));
- if (lseek (pi.fd, (off_t) memaddr, 0) == (off_t) memaddr)
- {
- if (dowrite)
- {
- nbytes = write (pi.fd, myaddr, len);
- }
- else
- {
- nbytes = read (pi.fd, myaddr, len);
- }
- if (nbytes < 0)
- {
- nbytes = 0;
- }
- }
- return (nbytes);
-}
+static void procfs_create_inferior PARAMS ((char *, char *, char **));
-/*
+static void procfs_notice_signals PARAMS ((int pid));
-GLOBAL FUNCTION
+static struct procinfo *find_procinfo PARAMS ((pid_t pid, int okfail));
- store_inferior_registers -- copy register values back to inferior
+typedef int syscall_func_t PARAMS ((struct procinfo *pi, int syscall_num,
+ int why, int *rtnval, int *statval));
-SYNOPSIS
+static void procfs_set_syscall_trap PARAMS ((struct procinfo *pi,
+ int syscall_num, int flags,
+ syscall_func_t *func));
- void store_inferior_registers (int regno)
+static void procfs_clear_syscall_trap PARAMS ((struct procinfo *pi,
+ int syscall_num, int errok));
-DESCRIPTION
+#define PROCFS_SYSCALL_ENTRY 0x1 /* Trap on entry to sys call */
+#define PROCFS_SYSCALL_EXIT 0x2 /* Trap on exit from sys call */
- Store our current register values back into the inferior. If
- REGNO is -1 then store all the register, otherwise store just
- the value specified by REGNO.
+static syscall_func_t procfs_exit_handler;
-NOTES
+static syscall_func_t procfs_exec_handler;
- If we are storing only a single register, we first have to get all
- the current values from the process, overwrite the desired register
- in the gregset with the one we want from gdb's registers, and then
- send the whole set back to the process. For writing all the
- registers, all we have to do is generate the gregset and send it to
- the process.
+#ifdef SYS_sproc
+static syscall_func_t procfs_sproc_handler;
+static syscall_func_t procfs_fork_handler;
+#endif
- Also note that the process has to be stopped on an event of interest
- for this to work, which basically means that it has to have been
- run under the control of one of the other /proc ioctl calls and not
- ptrace. Since we don't use ptrace anyway, we don't worry about this
- fine point, but it is worth noting for future reference.
+#ifdef SYS_lwp_create
+static syscall_func_t procfs_lwp_creation_handler;
+#endif
- Gdb is confused about what this function is supposed to return.
- Some versions return a value, others return nothing. Some are
- declared to return a value and actually return nothing. Gdb ignores
- anything returned. (FIXME)
+static void modify_inherit_on_fork_flag PARAMS ((int fd, int flag));
+static void modify_run_on_last_close_flag PARAMS ((int fd, int flag));
- */
+/* */
-void
-DEFUN(store_inferior_registers, (regno),
- int regno)
+struct procfs_syscall_handler
{
- if (regno != -1)
- {
- (void) ioctl (pi.fd, PIOCGREG, &pi.gregset);
- }
- fill_gregset (&pi.gregset, regno);
- (void) ioctl (pi.fd, PIOCSREG, &pi.gregset);
+ int syscall_num; /* The number of the system call being handled */
+ /* The function to be called */
+ syscall_func_t *func;
+};
-#if defined (FP0_REGNUM)
+static void procfs_resume PARAMS ((int pid, int step,
+ enum target_signal signo));
- /* Now repeat everything using the floating point register set, if the
- target has floating point hardware. Since we ignore the returned value,
- we'll never know whether it worked or not anyway. */
+/* External function prototypes that can't be easily included in any
+ header file because the args are typedefs in system include files. */
- if (regno != -1)
- {
- (void) ioctl (pi.fd, PIOCGFPREG, &pi.fpregset);
- }
- fill_fpregset (&pi.fpregset, regno);
- (void) ioctl (pi.fd, PIOCSFPREG, &pi.fpregset);
+extern void supply_gregset PARAMS ((gregset_t *));
-#endif /* FP0_REGNUM */
+extern void fill_gregset PARAMS ((gregset_t *, int));
-}
+extern void supply_fpregset PARAMS ((fpregset_t *));
+
+extern void fill_fpregset PARAMS ((fpregset_t *, int));
/*
-GLOBAL FUNCTION
+LOCAL FUNCTION
- inferior_proc_init - initialize access to a /proc entry
+ find_procinfo -- convert a process id to a struct procinfo
SYNOPSIS
- void inferior_proc_init (int pid)
+ static struct procinfo * find_procinfo (pid_t pid, int okfail);
DESCRIPTION
+
+ Given a process id, look it up in the procinfo chain. Returns
+ a struct procinfo *. If can't find pid, then call error(),
+ unless okfail is set, in which case, return NULL;
+ */
- When gdb starts an inferior, this function is called in the parent
- process immediately after the fork. It waits for the child to stop
- on the return from the exec system call (the child itself takes care
- of ensuring that this is set up), then sets up the set of signals
- and faults that are to be traced.
+static struct procinfo *
+find_procinfo (pid, okfail)
+ pid_t pid;
+ int okfail;
+{
+ struct procinfo *procinfo;
-NOTES
+ for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
+ if (procinfo->pid == pid)
+ return procinfo;
- If proc_init_failed ever gets called, control returns to the command
- processing loop via the standard error handling code.
- */
+ if (okfail)
+ return NULL;
-void
-DEFUN(inferior_proc_init, (int pid),
- int pid)
-{
- if (!open_proc_file (pid))
- {
- proc_init_failed ("can't open process file");
- }
- else
- {
- (void) memset (&pi.prrun, 0, sizeof (pi.prrun));
- prfillset (&pi.prrun.pr_trace);
- prfillset (&pi.prrun.pr_fault);
- prdelset (&pi.prrun.pr_fault, FLTPAGE);
- if (ioctl (pi.fd, PIOCWSTOP, &pi.prstatus) < 0)
- {
- proc_init_failed ("PIOCWSTOP failed");
- }
- else if (ioctl (pi.fd, PIOCSTRACE, &pi.prrun.pr_trace) < 0)
- {
- proc_init_failed ("PIOCSTRACE failed");
- }
- else if (ioctl (pi.fd, PIOCSFAULT, &pi.prrun.pr_fault) < 0)
- {
- proc_init_failed ("PIOCSFAULT failed");
- }
- }
+ error ("procfs (find_procinfo): Couldn't locate pid %d", pid);
}
/*
-GLOBAL FUNCTION
+LOCAL MACRO
- proc_set_exec_trap -- arrange for exec'd child to halt at startup
+ current_procinfo -- convert inferior_pid to a struct procinfo
SYNOPSIS
- void proc_set_exec_trap (void)
+ static struct procinfo * current_procinfo;
DESCRIPTION
+
+ Looks up inferior_pid in the procinfo chain. Always returns a
+ struct procinfo *. If process can't be found, we error() out.
+ */
- This function is called in the child process when starting up
- an inferior, prior to doing the exec of the actual inferior.
- It sets the child process's exitset to make exit from the exec
- system call an event of interest to stop on, and then simply
- returns. The child does the exec, the system call returns, and
- the child stops at the first instruction, ready for the gdb
- parent process to take control of it.
+#define current_procinfo find_procinfo (inferior_pid, 0)
-NOTE
+/*
- We need to use all local variables since the child may be sharing
- it's data space with the parent, if vfork was used rather than
- fork.
+LOCAL FUNCTION
+
+ add_fd -- Add the fd to the poll/select list
+
+SYNOPSIS
+
+ static void add_fd (struct procinfo *);
+
+DESCRIPTION
+
+ Add the fd of the supplied procinfo to the list of fds used for
+ poll/select operations.
*/
-void
-DEFUN_VOID(proc_set_exec_trap)
+static void
+add_fd (pi)
+ struct procinfo *pi;
{
- sysset_t exitset;
- auto char procname[32];
- int fd;
-
- (void) sprintf (procname, PROC_NAME_FMT, getpid ());
- if ((fd = open (procname, O_RDWR)) < 0)
- {
- perror (procname);
- fflush (stderr);
- _exit (127);
+ if (num_poll_list <= 0)
+ poll_list = (struct pollfd *) xmalloc (sizeof (struct pollfd));
+ else
+ poll_list = (struct pollfd *) xrealloc (poll_list,
+ (num_poll_list + 1)
+ * sizeof (struct pollfd));
+ poll_list[num_poll_list].fd = pi->fd;
+ poll_list[num_poll_list].events = POLLPRI;
+
+ num_poll_list++;
+}
+
+static void
+remove_fd (pi)
+ struct procinfo *pi;
+{
+ int i;
+
+ for (i = 0; i < num_poll_list; i++)
+ {
+ if (poll_list[i].fd == pi->fd)
+ {
+ if (i != num_poll_list - 1)
+ memcpy (poll_list + i, poll_list + i + 1,
+ (num_poll_list - i - 1) * sizeof (struct pollfd));
+
+ num_poll_list--;
+
+ if (num_poll_list == 0)
+ free (poll_list);
+ else
+ poll_list = (struct pollfd *) xrealloc (poll_list,
+ num_poll_list
+ * sizeof (struct pollfd));
+ return;
+ }
+ }
+}
+
+static struct procinfo *
+wait_fd ()
+{
+ struct procinfo *pi;
+#ifndef LOSING_POLL
+ int num_fds;
+ int i;
+#endif
+
+ set_sigint_trap (); /* Causes SIGINT to be passed on to the
+ attached process. */
+ set_sigio_trap ();
+
+#ifndef LOSING_POLL
+ num_fds = poll (poll_list, num_poll_list, -1);
+#else
+ pi = current_procinfo;
+
+ while (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
+ {
+ if (errno == ENOENT)
+ {
+ /* Process exited. */
+ pi->prstatus.pr_flags = 0;
+ break;
+ }
+ else if (errno != EINTR)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCWSTOP failed");
+ }
+ }
+ pi->had_event = 1;
+#endif
+
+ clear_sigint_trap ();
+ clear_sigio_trap ();
+
+#ifndef LOSING_POLL
+
+ if (num_fds <= 0)
+ {
+ print_sys_errmsg ("poll failed\n", errno);
+ error ("Poll failed, returned %d", num_fds);
+ }
+
+ for (i = 0; i < num_poll_list && num_fds > 0; i++)
+ {
+ if ((poll_list[i].revents & (POLLPRI|POLLERR|POLLHUP|POLLNVAL)) == 0)
+ continue;
+ for (pi = procinfo_list; pi; pi = pi->next)
+ {
+ if (poll_list[i].fd == pi->fd)
+ {
+ if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSTATUS failed");
+ }
+ num_fds--;
+ pi->had_event = 1;
+ break;
+ }
+ }
+ if (!pi)
+ error ("wait_fd: Couldn't find procinfo for fd %d\n",
+ poll_list[i].fd);
+ }
+#endif /* LOSING_POLL */
+
+ return pi;
+}
+
+/*
+
+LOCAL FUNCTION
+
+ lookupdesc -- translate a value to a summary desc string
+
+SYNOPSIS
+
+ static char *lookupdesc (struct trans *transp, unsigned int val);
+
+DESCRIPTION
+
+ Given a pointer to a translation table and a value to be translated,
+ lookup the desc string and return it.
+ */
+
+static char *
+lookupdesc (transp, val)
+ struct trans *transp;
+ unsigned int val;
+{
+ char *desc;
+
+ for (desc = NULL; transp -> name != NULL; transp++)
+ {
+ if (transp -> value == val)
+ {
+ desc = transp -> desc;
+ break;
+ }
+ }
+
+ /* Didn't find a translation for the specified value, set a default one. */
+
+ if (desc == NULL)
+ {
+ desc = "Unknown";
+ }
+ return (desc);
+}
+
+/*
+
+LOCAL FUNCTION
+
+ lookupname -- translate a value to symbolic name
+
+SYNOPSIS
+
+ static char *lookupname (struct trans *transp, unsigned int val,
+ char *prefix);
+
+DESCRIPTION
+
+ Given a pointer to a translation table, a value to be translated,
+ and a default prefix to return if the value can't be translated,
+ match the value with one of the translation table entries and
+ return a pointer to the symbolic name.
+
+ If no match is found it just returns the value as a printable string,
+ with the given prefix. The previous such value, if any, is freed
+ at this time.
+ */
+
+static char *
+lookupname (transp, val, prefix)
+ struct trans *transp;
+ unsigned int val;
+ char *prefix;
+{
+ static char *locbuf;
+ char *name;
+
+ for (name = NULL; transp -> name != NULL; transp++)
+ {
+ if (transp -> value == val)
+ {
+ name = transp -> name;
+ break;
+ }
+ }
+
+ /* Didn't find a translation for the specified value, build a default
+ one using the specified prefix and return it. The lifetime of
+ the value is only until the next one is needed. */
+
+ if (name == NULL)
+ {
+ if (locbuf != NULL)
+ {
+ free (locbuf);
+ }
+ locbuf = xmalloc (strlen (prefix) + 16);
+ sprintf (locbuf, "%s %u", prefix, val);
+ name = locbuf;
+ }
+ return (name);
+}
+
+static char *
+sigcodename (sip)
+ siginfo_t *sip;
+{
+ struct sigcode *scp;
+ char *name = NULL;
+ static char locbuf[32];
+
+ for (scp = siginfo_table; scp -> codename != NULL; scp++)
+ {
+ if ((scp -> signo == sip -> si_signo) &&
+ (scp -> code == sip -> si_code))
+ {
+ name = scp -> codename;
+ break;
+ }
+ }
+ if (name == NULL)
+ {
+ sprintf (locbuf, "sigcode %u", sip -> si_signo);
+ name = locbuf;
+ }
+ return (name);
+}
+
+static char *
+sigcodedesc (sip)
+ siginfo_t *sip;
+{
+ struct sigcode *scp;
+ char *desc = NULL;
+
+ for (scp = siginfo_table; scp -> codename != NULL; scp++)
+ {
+ if ((scp -> signo == sip -> si_signo) &&
+ (scp -> code == sip -> si_code))
+ {
+ desc = scp -> desc;
+ break;
+ }
+ }
+ if (desc == NULL)
+ {
+ desc = "Unrecognized signal or trap use";
+ }
+ return (desc);
+}
+
+/*
+
+LOCAL FUNCTION
+
+ syscallname - translate a system call number into a system call name
+
+SYNOPSIS
+
+ char *syscallname (int syscallnum)
+
+DESCRIPTION
+
+ Given a system call number, translate it into the printable name
+ of a system call, or into "syscall <num>" if it is an unknown
+ number.
+ */
+
+static char *
+syscallname (syscallnum)
+ int syscallnum;
+{
+ static char locbuf[32];
+
+ if (syscallnum >= 0 && syscallnum < MAX_SYSCALLS
+ && syscall_table[syscallnum] != NULL)
+ return syscall_table[syscallnum];
+ else
+ {
+ sprintf (locbuf, "syscall %u", syscallnum);
+ return locbuf;
+ }
+}
+
+/*
+
+LOCAL FUNCTION
+
+ init_syscall_table - initialize syscall translation table
+
+SYNOPSIS
+
+ void init_syscall_table (void)
+
+DESCRIPTION
+
+ Dynamically initialize the translation table to convert system
+ call numbers into printable system call names. Done once per
+ gdb run, on initialization.
+
+NOTES
+
+ This is awfully ugly, but preprocessor tricks to make it prettier
+ tend to be nonportable.
+ */
+
+static void
+init_syscall_table ()
+{
+#if defined (SYS_exit)
+ syscall_table[SYS_exit] = "exit";
+#endif
+#if defined (SYS_fork)
+ syscall_table[SYS_fork] = "fork";
+#endif
+#if defined (SYS_read)
+ syscall_table[SYS_read] = "read";
+#endif
+#if defined (SYS_write)
+ syscall_table[SYS_write] = "write";
+#endif
+#if defined (SYS_open)
+ syscall_table[SYS_open] = "open";
+#endif
+#if defined (SYS_close)
+ syscall_table[SYS_close] = "close";
+#endif
+#if defined (SYS_wait)
+ syscall_table[SYS_wait] = "wait";
+#endif
+#if defined (SYS_creat)
+ syscall_table[SYS_creat] = "creat";
+#endif
+#if defined (SYS_link)
+ syscall_table[SYS_link] = "link";
+#endif
+#if defined (SYS_unlink)
+ syscall_table[SYS_unlink] = "unlink";
+#endif
+#if defined (SYS_exec)
+ syscall_table[SYS_exec] = "exec";
+#endif
+#if defined (SYS_execv)
+ syscall_table[SYS_execv] = "execv";
+#endif
+#if defined (SYS_execve)
+ syscall_table[SYS_execve] = "execve";
+#endif
+#if defined (SYS_chdir)
+ syscall_table[SYS_chdir] = "chdir";
+#endif
+#if defined (SYS_time)
+ syscall_table[SYS_time] = "time";
+#endif
+#if defined (SYS_mknod)
+ syscall_table[SYS_mknod] = "mknod";
+#endif
+#if defined (SYS_chmod)
+ syscall_table[SYS_chmod] = "chmod";
+#endif
+#if defined (SYS_chown)
+ syscall_table[SYS_chown] = "chown";
+#endif
+#if defined (SYS_brk)
+ syscall_table[SYS_brk] = "brk";
+#endif
+#if defined (SYS_stat)
+ syscall_table[SYS_stat] = "stat";
+#endif
+#if defined (SYS_lseek)
+ syscall_table[SYS_lseek] = "lseek";
+#endif
+#if defined (SYS_getpid)
+ syscall_table[SYS_getpid] = "getpid";
+#endif
+#if defined (SYS_mount)
+ syscall_table[SYS_mount] = "mount";
+#endif
+#if defined (SYS_umount)
+ syscall_table[SYS_umount] = "umount";
+#endif
+#if defined (SYS_setuid)
+ syscall_table[SYS_setuid] = "setuid";
+#endif
+#if defined (SYS_getuid)
+ syscall_table[SYS_getuid] = "getuid";
+#endif
+#if defined (SYS_stime)
+ syscall_table[SYS_stime] = "stime";
+#endif
+#if defined (SYS_ptrace)
+ syscall_table[SYS_ptrace] = "ptrace";
+#endif
+#if defined (SYS_alarm)
+ syscall_table[SYS_alarm] = "alarm";
+#endif
+#if defined (SYS_fstat)
+ syscall_table[SYS_fstat] = "fstat";
+#endif
+#if defined (SYS_pause)
+ syscall_table[SYS_pause] = "pause";
+#endif
+#if defined (SYS_utime)
+ syscall_table[SYS_utime] = "utime";
+#endif
+#if defined (SYS_stty)
+ syscall_table[SYS_stty] = "stty";
+#endif
+#if defined (SYS_gtty)
+ syscall_table[SYS_gtty] = "gtty";
+#endif
+#if defined (SYS_access)
+ syscall_table[SYS_access] = "access";
+#endif
+#if defined (SYS_nice)
+ syscall_table[SYS_nice] = "nice";
+#endif
+#if defined (SYS_statfs)
+ syscall_table[SYS_statfs] = "statfs";
+#endif
+#if defined (SYS_sync)
+ syscall_table[SYS_sync] = "sync";
+#endif
+#if defined (SYS_kill)
+ syscall_table[SYS_kill] = "kill";
+#endif
+#if defined (SYS_fstatfs)
+ syscall_table[SYS_fstatfs] = "fstatfs";
+#endif
+#if defined (SYS_pgrpsys)
+ syscall_table[SYS_pgrpsys] = "pgrpsys";
+#endif
+#if defined (SYS_xenix)
+ syscall_table[SYS_xenix] = "xenix";
+#endif
+#if defined (SYS_dup)
+ syscall_table[SYS_dup] = "dup";
+#endif
+#if defined (SYS_pipe)
+ syscall_table[SYS_pipe] = "pipe";
+#endif
+#if defined (SYS_times)
+ syscall_table[SYS_times] = "times";
+#endif
+#if defined (SYS_profil)
+ syscall_table[SYS_profil] = "profil";
+#endif
+#if defined (SYS_plock)
+ syscall_table[SYS_plock] = "plock";
+#endif
+#if defined (SYS_setgid)
+ syscall_table[SYS_setgid] = "setgid";
+#endif
+#if defined (SYS_getgid)
+ syscall_table[SYS_getgid] = "getgid";
+#endif
+#if defined (SYS_signal)
+ syscall_table[SYS_signal] = "signal";
+#endif
+#if defined (SYS_msgsys)
+ syscall_table[SYS_msgsys] = "msgsys";
+#endif
+#if defined (SYS_sys3b)
+ syscall_table[SYS_sys3b] = "sys3b";
+#endif
+#if defined (SYS_acct)
+ syscall_table[SYS_acct] = "acct";
+#endif
+#if defined (SYS_shmsys)
+ syscall_table[SYS_shmsys] = "shmsys";
+#endif
+#if defined (SYS_semsys)
+ syscall_table[SYS_semsys] = "semsys";
+#endif
+#if defined (SYS_ioctl)
+ syscall_table[SYS_ioctl] = "ioctl";
+#endif
+#if defined (SYS_uadmin)
+ syscall_table[SYS_uadmin] = "uadmin";
+#endif
+#if defined (SYS_utssys)
+ syscall_table[SYS_utssys] = "utssys";
+#endif
+#if defined (SYS_fsync)
+ syscall_table[SYS_fsync] = "fsync";
+#endif
+#if defined (SYS_umask)
+ syscall_table[SYS_umask] = "umask";
+#endif
+#if defined (SYS_chroot)
+ syscall_table[SYS_chroot] = "chroot";
+#endif
+#if defined (SYS_fcntl)
+ syscall_table[SYS_fcntl] = "fcntl";
+#endif
+#if defined (SYS_ulimit)
+ syscall_table[SYS_ulimit] = "ulimit";
+#endif
+#if defined (SYS_rfsys)
+ syscall_table[SYS_rfsys] = "rfsys";
+#endif
+#if defined (SYS_rmdir)
+ syscall_table[SYS_rmdir] = "rmdir";
+#endif
+#if defined (SYS_mkdir)
+ syscall_table[SYS_mkdir] = "mkdir";
+#endif
+#if defined (SYS_getdents)
+ syscall_table[SYS_getdents] = "getdents";
+#endif
+#if defined (SYS_sysfs)
+ syscall_table[SYS_sysfs] = "sysfs";
+#endif
+#if defined (SYS_getmsg)
+ syscall_table[SYS_getmsg] = "getmsg";
+#endif
+#if defined (SYS_putmsg)
+ syscall_table[SYS_putmsg] = "putmsg";
+#endif
+#if defined (SYS_poll)
+ syscall_table[SYS_poll] = "poll";
+#endif
+#if defined (SYS_lstat)
+ syscall_table[SYS_lstat] = "lstat";
+#endif
+#if defined (SYS_symlink)
+ syscall_table[SYS_symlink] = "symlink";
+#endif
+#if defined (SYS_readlink)
+ syscall_table[SYS_readlink] = "readlink";
+#endif
+#if defined (SYS_setgroups)
+ syscall_table[SYS_setgroups] = "setgroups";
+#endif
+#if defined (SYS_getgroups)
+ syscall_table[SYS_getgroups] = "getgroups";
+#endif
+#if defined (SYS_fchmod)
+ syscall_table[SYS_fchmod] = "fchmod";
+#endif
+#if defined (SYS_fchown)
+ syscall_table[SYS_fchown] = "fchown";
+#endif
+#if defined (SYS_sigprocmask)
+ syscall_table[SYS_sigprocmask] = "sigprocmask";
+#endif
+#if defined (SYS_sigsuspend)
+ syscall_table[SYS_sigsuspend] = "sigsuspend";
+#endif
+#if defined (SYS_sigaltstack)
+ syscall_table[SYS_sigaltstack] = "sigaltstack";
+#endif
+#if defined (SYS_sigaction)
+ syscall_table[SYS_sigaction] = "sigaction";
+#endif
+#if defined (SYS_sigpending)
+ syscall_table[SYS_sigpending] = "sigpending";
+#endif
+#if defined (SYS_context)
+ syscall_table[SYS_context] = "context";
+#endif
+#if defined (SYS_evsys)
+ syscall_table[SYS_evsys] = "evsys";
+#endif
+#if defined (SYS_evtrapret)
+ syscall_table[SYS_evtrapret] = "evtrapret";
+#endif
+#if defined (SYS_statvfs)
+ syscall_table[SYS_statvfs] = "statvfs";
+#endif
+#if defined (SYS_fstatvfs)
+ syscall_table[SYS_fstatvfs] = "fstatvfs";
+#endif
+#if defined (SYS_nfssys)
+ syscall_table[SYS_nfssys] = "nfssys";
+#endif
+#if defined (SYS_waitsys)
+ syscall_table[SYS_waitsys] = "waitsys";
+#endif
+#if defined (SYS_sigsendsys)
+ syscall_table[SYS_sigsendsys] = "sigsendsys";
+#endif
+#if defined (SYS_hrtsys)
+ syscall_table[SYS_hrtsys] = "hrtsys";
+#endif
+#if defined (SYS_acancel)
+ syscall_table[SYS_acancel] = "acancel";
+#endif
+#if defined (SYS_async)
+ syscall_table[SYS_async] = "async";
+#endif
+#if defined (SYS_priocntlsys)
+ syscall_table[SYS_priocntlsys] = "priocntlsys";
+#endif
+#if defined (SYS_pathconf)
+ syscall_table[SYS_pathconf] = "pathconf";
+#endif
+#if defined (SYS_mincore)
+ syscall_table[SYS_mincore] = "mincore";
+#endif
+#if defined (SYS_mmap)
+ syscall_table[SYS_mmap] = "mmap";
+#endif
+#if defined (SYS_mprotect)
+ syscall_table[SYS_mprotect] = "mprotect";
+#endif
+#if defined (SYS_munmap)
+ syscall_table[SYS_munmap] = "munmap";
+#endif
+#if defined (SYS_fpathconf)
+ syscall_table[SYS_fpathconf] = "fpathconf";
+#endif
+#if defined (SYS_vfork)
+ syscall_table[SYS_vfork] = "vfork";
+#endif
+#if defined (SYS_fchdir)
+ syscall_table[SYS_fchdir] = "fchdir";
+#endif
+#if defined (SYS_readv)
+ syscall_table[SYS_readv] = "readv";
+#endif
+#if defined (SYS_writev)
+ syscall_table[SYS_writev] = "writev";
+#endif
+#if defined (SYS_xstat)
+ syscall_table[SYS_xstat] = "xstat";
+#endif
+#if defined (SYS_lxstat)
+ syscall_table[SYS_lxstat] = "lxstat";
+#endif
+#if defined (SYS_fxstat)
+ syscall_table[SYS_fxstat] = "fxstat";
+#endif
+#if defined (SYS_xmknod)
+ syscall_table[SYS_xmknod] = "xmknod";
+#endif
+#if defined (SYS_clocal)
+ syscall_table[SYS_clocal] = "clocal";
+#endif
+#if defined (SYS_setrlimit)
+ syscall_table[SYS_setrlimit] = "setrlimit";
+#endif
+#if defined (SYS_getrlimit)
+ syscall_table[SYS_getrlimit] = "getrlimit";
+#endif
+#if defined (SYS_lchown)
+ syscall_table[SYS_lchown] = "lchown";
+#endif
+#if defined (SYS_memcntl)
+ syscall_table[SYS_memcntl] = "memcntl";
+#endif
+#if defined (SYS_getpmsg)
+ syscall_table[SYS_getpmsg] = "getpmsg";
+#endif
+#if defined (SYS_putpmsg)
+ syscall_table[SYS_putpmsg] = "putpmsg";
+#endif
+#if defined (SYS_rename)
+ syscall_table[SYS_rename] = "rename";
+#endif
+#if defined (SYS_uname)
+ syscall_table[SYS_uname] = "uname";
+#endif
+#if defined (SYS_setegid)
+ syscall_table[SYS_setegid] = "setegid";
+#endif
+#if defined (SYS_sysconfig)
+ syscall_table[SYS_sysconfig] = "sysconfig";
+#endif
+#if defined (SYS_adjtime)
+ syscall_table[SYS_adjtime] = "adjtime";
+#endif
+#if defined (SYS_systeminfo)
+ syscall_table[SYS_systeminfo] = "systeminfo";
+#endif
+#if defined (SYS_seteuid)
+ syscall_table[SYS_seteuid] = "seteuid";
+#endif
+#if defined (SYS_sproc)
+ syscall_table[SYS_sproc] = "sproc";
+#endif
+}
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_kill_inferior - kill any currently inferior
+
+SYNOPSIS
+
+ void procfs_kill_inferior (void)
+
+DESCRIPTION
+
+ Kill any current inferior.
+
+NOTES
+
+ Kills even attached inferiors. Presumably the user has already
+ been prompted that the inferior is an attached one rather than
+ one started by gdb. (FIXME?)
+
+*/
+
+static void
+procfs_kill_inferior ()
+{
+ target_mourn_inferior ();
+}
+
+/*
+
+LOCAL FUNCTION
+
+ unconditionally_kill_inferior - terminate the inferior
+
+SYNOPSIS
+
+ static void unconditionally_kill_inferior (struct procinfo *)
+
+DESCRIPTION
+
+ Kill the specified inferior.
+
+NOTE
+
+ A possibly useful enhancement would be to first try sending
+ the inferior a terminate signal, politely asking it to commit
+ suicide, before we murder it (we could call that
+ politely_kill_inferior()).
+
+*/
+
+static void
+unconditionally_kill_inferior (pi)
+ struct procinfo *pi;
+{
+ int signo;
+ int ppid;
+
+ ppid = pi->prstatus.pr_ppid;
+
+ signo = SIGKILL;
+
+#ifdef PROCFS_NEED_CLEAR_CURSIG_FOR_KILL
+ /* Alpha OSF/1-3.x procfs needs a clear of the current signal
+ before the PIOCKILL, otherwise it might generate a corrupted core
+ file for the inferior. */
+ ioctl (pi->fd, PIOCSSIG, NULL);
+#endif
+#ifdef PROCFS_NEED_PIOCSSIG_FOR_KILL
+ /* Alpha OSF/1-2.x procfs needs a PIOCSSIG call with a SIGKILL signal
+ to kill the inferior, otherwise it might remain stopped with a
+ pending SIGKILL.
+ We do not check the result of the PIOCSSIG, the inferior might have
+ died already. */
+ {
+ struct siginfo newsiginfo;
+
+ memset ((char *) &newsiginfo, 0, sizeof (newsiginfo));
+ newsiginfo.si_signo = signo;
+ newsiginfo.si_code = 0;
+ newsiginfo.si_errno = 0;
+ newsiginfo.si_pid = getpid ();
+ newsiginfo.si_uid = getuid ();
+ ioctl (pi->fd, PIOCSSIG, &newsiginfo);
+ }
+#else
+ ioctl (pi->fd, PIOCKILL, &signo);
+#endif
+
+ close_proc_file (pi);
+
+/* Only wait() for our direct children. Our grandchildren zombies are killed
+ by the death of their parents. */
+
+ if (ppid == getpid())
+ wait ((int *) 0);
+}
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_xfer_memory -- copy data to or from inferior memory space
+
+SYNOPSIS
+
+ int procfs_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
+ int dowrite, struct target_ops target)
+
+DESCRIPTION
+
+ Copy LEN bytes to/from inferior's memory starting at MEMADDR
+ from/to debugger memory starting at MYADDR. Copy from inferior
+ if DOWRITE is zero or to inferior if DOWRITE is nonzero.
+
+ Returns the length copied, which is either the LEN argument or
+ zero. This xfer function does not do partial moves, since procfs_ops
+ doesn't allow memory operations to cross below us in the target stack
+ anyway.
+
+NOTES
+
+ The /proc interface makes this an almost trivial task.
+ */
+
+static int
+procfs_xfer_memory (memaddr, myaddr, len, dowrite, target)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ int len;
+ int dowrite;
+ struct target_ops *target; /* ignored */
+{
+ int nbytes = 0;
+ struct procinfo *pi;
+
+ pi = current_procinfo;
+
+ if (lseek(pi->fd, (off_t) memaddr, 0) == (off_t) memaddr)
+ {
+ if (dowrite)
+ {
+ nbytes = write (pi->fd, myaddr, len);
+ }
+ else
+ {
+ nbytes = read (pi->fd, myaddr, len);
+ }
+ if (nbytes < 0)
+ {
+ nbytes = 0;
+ }
+ }
+ return (nbytes);
+}
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_store_registers -- copy register values back to inferior
+
+SYNOPSIS
+
+ void procfs_store_registers (int regno)
+
+DESCRIPTION
+
+ Store our current register values back into the inferior. If
+ REGNO is -1 then store all the register, otherwise store just
+ the value specified by REGNO.
+
+NOTES
+
+ If we are storing only a single register, we first have to get all
+ the current values from the process, overwrite the desired register
+ in the gregset with the one we want from gdb's registers, and then
+ send the whole set back to the process. For writing all the
+ registers, all we have to do is generate the gregset and send it to
+ the process.
+
+ Also note that the process has to be stopped on an event of interest
+ for this to work, which basically means that it has to have been
+ run under the control of one of the other /proc ioctl calls and not
+ ptrace. Since we don't use ptrace anyway, we don't worry about this
+ fine point, but it is worth noting for future reference.
+
+ Gdb is confused about what this function is supposed to return.
+ Some versions return a value, others return nothing. Some are
+ declared to return a value and actually return nothing. Gdb ignores
+ anything returned. (FIXME)
+
+ */
+
+static void
+procfs_store_registers (regno)
+ int regno;
+{
+ struct procinfo *pi;
+
+ pi = current_procinfo;
+
+ if (regno != -1)
+ {
+ ioctl (pi->fd, PIOCGREG, &pi->gregset);
+ }
+ fill_gregset (&pi->gregset, regno);
+ ioctl (pi->fd, PIOCSREG, &pi->gregset);
+
+#if defined (FP0_REGNUM)
+
+ /* Now repeat everything using the floating point register set, if the
+ target has floating point hardware. Since we ignore the returned value,
+ we'll never know whether it worked or not anyway. */
+
+ if (regno != -1)
+ {
+ ioctl (pi->fd, PIOCGFPREG, &pi->fpregset);
+ }
+ fill_fpregset (&pi->fpregset, regno);
+ ioctl (pi->fd, PIOCSFPREG, &pi->fpregset);
+
+#endif /* FP0_REGNUM */
+
+}
+
+/*
+
+LOCAL FUNCTION
+
+ create_procinfo - initialize access to a /proc entry
+
+SYNOPSIS
+
+ struct procinfo * create_procinfo (int pid)
+
+DESCRIPTION
+
+ Allocate a procinfo structure, open the /proc file and then set up the
+ set of signals and faults that are to be traced. Returns a pointer to
+ the new procinfo structure.
+
+NOTES
+
+ If proc_init_failed ever gets called, control returns to the command
+ processing loop via the standard error handling code.
+
+ */
+
+static struct procinfo *
+create_procinfo (pid)
+ int pid;
+{
+ struct procinfo *pi;
+
+ pi = find_procinfo (pid, 1);
+ if (pi != NULL)
+ return pi; /* All done! It already exists */
+
+ pi = (struct procinfo *) xmalloc (sizeof (struct procinfo));
+
+ if (!open_proc_file (pid, pi, O_RDWR))
+ proc_init_failed (pi, "can't open process file");
+
+ /* open_proc_file may modify pid. */
+
+ pid = pi -> pid;
+
+ /* Add new process to process info list */
+
+ pi->next = procinfo_list;
+ procinfo_list = pi;
+
+ add_fd (pi); /* Add to list for poll/select */
+
+ pi->num_syscall_handlers = 0;
+ pi->syscall_handlers = NULL;
+ memset ((char *) &pi->prrun, 0, sizeof (pi->prrun));
+ prfillset (&pi->prrun.pr_trace);
+ procfs_notice_signals (pid);
+ prfillset (&pi->prrun.pr_fault);
+ prdelset (&pi->prrun.pr_fault, FLTPAGE);
+
+#ifdef PROCFS_DONT_TRACE_FAULTS
+ premptyset (&pi->prrun.pr_fault);
+#endif
+
+ if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
+ proc_init_failed (pi, "PIOCSTATUS failed");
+
+/* A bug in Solaris (2.5 at least) causes PIOCWSTOP to hang on LWPs that are
+ already stopped, even if they all have PR_ASYNC set. */
+
+ if (!(pi->prstatus.pr_flags & PR_STOPPED))
+ if (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
+ proc_init_failed (pi, "PIOCWSTOP failed");
+
+ if (ioctl (pi->fd, PIOCSFAULT, &pi->prrun.pr_fault) < 0)
+ proc_init_failed (pi, "PIOCSFAULT failed");
+
+ return pi;
+}
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_exit_handler - handle entry into the _exit syscall
+
+SYNOPSIS
+
+ int procfs_exit_handler (pi, syscall_num, why, rtnvalp, statvalp)
+
+DESCRIPTION
+
+ This routine is called when an inferior process enters the _exit()
+ system call. It continues the process, and then collects the exit
+ status and pid which are returned in *statvalp and *rtnvalp. After
+ that it returns non-zero to indicate that procfs_wait should wake up.
+
+NOTES
+ There is probably a better way to do this.
+
+ */
+
+static int
+procfs_exit_handler (pi, syscall_num, why, rtnvalp, statvalp)
+ struct procinfo *pi;
+ int syscall_num;
+ int why;
+ int *rtnvalp;
+ int *statvalp;
+{
+ pi->prrun.pr_flags = PRCFAULT;
+
+ if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
+ perror_with_name (pi->pathname);
+
+ *rtnvalp = wait (statvalp);
+ if (*rtnvalp >= 0)
+ *rtnvalp = pi->pid;
+
+ return 1;
+}
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_exec_handler - handle exit from the exec family of syscalls
+
+SYNOPSIS
+
+ int procfs_exec_handler (pi, syscall_num, why, rtnvalp, statvalp)
+
+DESCRIPTION
+
+ This routine is called when an inferior process is about to finish any
+ of the exec() family of system calls. It pretends that we got a
+ SIGTRAP (for compatibility with ptrace behavior), and returns non-zero
+ to tell procfs_wait to wake up.
+
+NOTES
+ This need for compatibility with ptrace is questionable. In the
+ future, it shouldn't be necessary.
+
+ */
+
+static int
+procfs_exec_handler (pi, syscall_num, why, rtnvalp, statvalp)
+ struct procinfo *pi;
+ int syscall_num;
+ int why;
+ int *rtnvalp;
+ int *statvalp;
+{
+ *statvalp = (SIGTRAP << 8) | 0177;
+
+ return 1;
+}
+
+#ifdef SYS_sproc /* IRIX lwp creation system call */
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_sproc_handler - handle exit from the sproc syscall
+
+SYNOPSIS
+
+ int procfs_sproc_handler (pi, syscall_num, why, rtnvalp, statvalp)
+
+DESCRIPTION
+
+ This routine is called when an inferior process is about to finish an
+ sproc() system call. This is the system call that IRIX uses to create
+ a lightweight process. When the target process gets this event, we can
+ look at rval1 to find the new child processes ID, and create a new
+ procinfo struct from that.
+
+ After that, it pretends that we got a SIGTRAP, and returns non-zero
+ to tell procfs_wait to wake up. Subsequently, wait_for_inferior gets
+ woken up, sees the new process and continues it.
+
+NOTES
+ We actually never see the child exiting from sproc because we will
+ shortly stop the child with PIOCSTOP, which is then registered as the
+ event of interest.
+ */
+
+static int
+procfs_sproc_handler (pi, syscall_num, why, rtnvalp, statvalp)
+ struct procinfo *pi;
+ int syscall_num;
+ int why;
+ int *rtnvalp;
+ int *statvalp;
+{
+/* We've just detected the completion of an sproc system call. Now we need to
+ setup a procinfo struct for this thread, and notify the thread system of the
+ new arrival. */
+
+/* If sproc failed, then nothing interesting happened. Continue the process
+ and go back to sleep. */
+
+ if (pi->prstatus.pr_errno != 0)
+ {
+ pi->prrun.pr_flags &= PRSTEP;
+ pi->prrun.pr_flags |= PRCFAULT;
+
+ if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
+ perror_with_name (pi->pathname);
+
+ return 0;
+ }
+
+ /* At this point, the new thread is stopped at it's first instruction, and
+ the parent is stopped at the exit from sproc. */
+
+ /* Notify the caller of the arrival of a new thread. */
+ create_procinfo (pi->prstatus.pr_rval1);
+
+ *rtnvalp = pi->prstatus.pr_rval1;
+ *statvalp = (SIGTRAP << 8) | 0177;
+
+ return 1;
+}
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_fork_handler - handle exit from the fork syscall
+
+SYNOPSIS
+
+ int procfs_fork_handler (pi, syscall_num, why, rtnvalp, statvalp)
+
+DESCRIPTION
+
+ This routine is called when an inferior process is about to finish a
+ fork() system call. We will open up the new process, and then close
+ it, which releases it from the clutches of the debugger.
+
+ After that, we continue the target process as though nothing had
+ happened.
+
+NOTES
+ This is necessary for IRIX because we have to set PR_FORK in order
+ to catch the creation of lwps (via sproc()). When an actual fork
+ occurs, it becomes necessary to reset the forks debugger flags and
+ continue it because we can't hack multiple processes yet.
+ */
+
+static int
+procfs_fork_handler (pi, syscall_num, why, rtnvalp, statvalp)
+ struct procinfo *pi;
+ int syscall_num;
+ int why;
+ int *rtnvalp;
+ int *statvalp;
+{
+ struct procinfo *pitemp;
+
+/* At this point, we've detected the completion of a fork (or vfork) call in
+ our child. The grandchild is also stopped because we set inherit-on-fork
+ earlier. (Note that nobody has the grandchilds' /proc file open at this
+ point.) We will release the grandchild from the debugger by opening it's
+ /proc file and then closing it. Since run-on-last-close is set, the
+ grandchild continues on its' merry way. */
+
+
+ pitemp = create_procinfo (pi->prstatus.pr_rval1);
+ if (pitemp)
+ close_proc_file (pitemp);
+
+ if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
+ perror_with_name (pi->pathname);
+
+ return 0;
+}
+#endif /* SYS_sproc */
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_init_inferior - initialize target vector and access to a
+ /proc entry
+
+SYNOPSIS
+
+ int procfs_init_inferior (int pid)
+
+DESCRIPTION
+
+ When gdb starts an inferior, this function is called in the parent
+ process immediately after the fork. It waits for the child to stop
+ on the return from the exec system call (the child itself takes care
+ of ensuring that this is set up), then sets up the set of signals
+ and faults that are to be traced. Returns the pid, which may have had
+ the thread-id added to it.
+
+NOTES
+
+ If proc_init_failed ever gets called, control returns to the command
+ processing loop via the standard error handling code.
+
+ */
+
+static int
+procfs_init_inferior (pid)
+ int pid;
+{
+ struct procinfo *pip;
+
+ push_target (&procfs_ops);
+
+ pip = create_procinfo (pid);
+
+ procfs_set_syscall_trap (pip, SYS_exit, PROCFS_SYSCALL_ENTRY,
+ procfs_exit_handler);
+
+#ifndef PRFS_STOPEXEC
+#ifdef SYS_exec
+ procfs_set_syscall_trap (pip, SYS_exec, PROCFS_SYSCALL_EXIT,
+ procfs_exec_handler);
+#endif
+#ifdef SYS_execv
+ procfs_set_syscall_trap (pip, SYS_execv, PROCFS_SYSCALL_EXIT,
+ procfs_exec_handler);
+#endif
+#ifdef SYS_execve
+ procfs_set_syscall_trap (pip, SYS_execve, PROCFS_SYSCALL_EXIT,
+ procfs_exec_handler);
+#endif
+#endif /* PRFS_STOPEXEC */
+
+ /* Setup traps on exit from sproc() */
+
+#ifdef SYS_sproc
+ procfs_set_syscall_trap (pip, SYS_sproc, PROCFS_SYSCALL_EXIT,
+ procfs_sproc_handler);
+ procfs_set_syscall_trap (pip, SYS_fork, PROCFS_SYSCALL_EXIT,
+ procfs_fork_handler);
+#ifdef SYS_vfork
+ procfs_set_syscall_trap (pip, SYS_vfork, PROCFS_SYSCALL_EXIT,
+ procfs_fork_handler);
+#endif
+/* Turn on inherit-on-fork flag so that all children of the target process
+ start with tracing flags set. This allows us to trap lwp creation. Note
+ that we also have to trap on fork and vfork in order to disable all tracing
+ in the targets child processes. */
+
+ modify_inherit_on_fork_flag (pip->fd, 1);
+#endif
+
+#ifdef SYS_lwp_create
+ procfs_set_syscall_trap (pip, SYS_lwp_create, PROCFS_SYSCALL_EXIT,
+ procfs_lwp_creation_handler);
+#endif
+
+ /* create_procinfo may change the pid, so we have to update inferior_pid
+ here before calling other gdb routines that need the right pid. */
+
+ pid = pip -> pid;
+ inferior_pid = pid;
+
+ add_thread (pip -> pid); /* Setup initial thread */
+
+#ifdef START_INFERIOR_TRAPS_EXPECTED
+ startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
+#else
+ /* One trap to exec the shell, one to exec the program being debugged. */
+ startup_inferior (2);
+#endif
+
+ return pid;
+}
+
+/*
+
+GLOBAL FUNCTION
+
+ procfs_notice_signals
+
+SYNOPSIS
+
+ static void procfs_notice_signals (int pid);
+
+DESCRIPTION
+
+ When the user changes the state of gdb's signal handling via the
+ "handle" command, this function gets called to see if any change
+ in the /proc interface is required. It is also called internally
+ by other /proc interface functions to initialize the state of
+ the traced signal set.
+
+ One thing it does is that signals for which the state is "nostop",
+ "noprint", and "pass", have their trace bits reset in the pr_trace
+ field, so that they are no longer traced. This allows them to be
+ delivered directly to the inferior without the debugger ever being
+ involved.
+ */
+
+static void
+procfs_notice_signals (pid)
+ int pid;
+{
+ int signo;
+ struct procinfo *pi;
+
+ pi = find_procinfo (pid, 0);
+
+ for (signo = 0; signo < NSIG; signo++)
+ {
+ if (signal_stop_state (target_signal_from_host (signo)) == 0 &&
+ signal_print_state (target_signal_from_host (signo)) == 0 &&
+ signal_pass_state (target_signal_from_host (signo)) == 1)
+ {
+ prdelset (&pi->prrun.pr_trace, signo);
+ }
+ else
+ {
+ praddset (&pi->prrun.pr_trace, signo);
+ }
+ }
+ if (ioctl (pi->fd, PIOCSTRACE, &pi->prrun.pr_trace))
+ {
+ print_sys_errmsg ("PIOCSTRACE failed", errno);
+ }
+}
+
+/*
+
+LOCAL FUNCTION
+
+ proc_set_exec_trap -- arrange for exec'd child to halt at startup
+
+SYNOPSIS
+
+ void proc_set_exec_trap (void)
+
+DESCRIPTION
+
+ This function is called in the child process when starting up
+ an inferior, prior to doing the exec of the actual inferior.
+ It sets the child process's exitset to make exit from the exec
+ system call an event of interest to stop on, and then simply
+ returns. The child does the exec, the system call returns, and
+ the child stops at the first instruction, ready for the gdb
+ parent process to take control of it.
+
+NOTE
+
+ We need to use all local variables since the child may be sharing
+ it's data space with the parent, if vfork was used rather than
+ fork.
+
+ Also note that we want to turn off the inherit-on-fork flag in
+ the child process so that any grand-children start with all
+ tracing flags cleared.
+ */
+
+static void
+proc_set_exec_trap ()
+{
+ sysset_t exitset;
+ sysset_t entryset;
+ auto char procname[32];
+ int fd;
+
+ sprintf (procname, PROC_NAME_FMT, getpid ());
+ if ((fd = open (procname, O_RDWR)) < 0)
+ {
+ perror (procname);
+ gdb_flush (gdb_stderr);
+ _exit (127);
+ }
+ premptyset (&exitset);
+ premptyset (&entryset);
+
+#ifdef PIOCSSPCACT
+ /* Under Alpha OSF/1 we have to use a PIOCSSPCACT ioctl to trace
+ exits from exec system calls because of the user level loader. */
+ {
+ int prfs_flags;
+
+ if (ioctl (fd, PIOCGSPCACT, &prfs_flags) < 0)
+ {
+ perror (procname);
+ gdb_flush (gdb_stderr);
+ _exit (127);
+ }
+ prfs_flags |= PRFS_STOPEXEC;
+ if (ioctl (fd, PIOCSSPCACT, &prfs_flags) < 0)
+ {
+ perror (procname);
+ gdb_flush (gdb_stderr);
+ _exit (127);
+ }
+ }
+#else
+ /* GW: Rationale...
+ Not all systems with /proc have all the exec* syscalls with the same
+ names. On the SGI, for example, there is no SYS_exec, but there
+ *is* a SYS_execv. So, we try to account for that. */
+
+#ifdef SYS_exec
+ praddset (&exitset, SYS_exec);
+#endif
+#ifdef SYS_execve
+ praddset (&exitset, SYS_execve);
+#endif
+#ifdef SYS_execv
+ praddset (&exitset, SYS_execv);
+#endif
+
+ if (ioctl (fd, PIOCSEXIT, &exitset) < 0)
+ {
+ perror (procname);
+ gdb_flush (gdb_stderr);
+ _exit (127);
+ }
+#endif
+
+ praddset (&entryset, SYS_exit);
+
+ if (ioctl (fd, PIOCSENTRY, &entryset) < 0)
+ {
+ perror (procname);
+ gdb_flush (gdb_stderr);
+ _exit (126);
+ }
+
+ /* Turn off inherit-on-fork flag so that all grand-children of gdb
+ start with tracing flags cleared. */
+
+ modify_inherit_on_fork_flag (fd, 0);
+
+ /* Turn on run-on-last-close flag so that this process will not hang
+ if GDB goes away for some reason. */
+
+ modify_run_on_last_close_flag (fd, 1);
+
+#ifdef PR_ASYNC
+ {
+ long pr_flags;
+
+/* Solaris needs this to make procfs treat all threads seperately. Without
+ this, all threads halt whenever something happens to any thread. Since
+ GDB wants to control all this itself, it needs to set PR_ASYNC. */
+
+ pr_flags = PR_ASYNC;
+
+ ioctl (fd, PIOCSET, &pr_flags);
+ }
+#endif /* PR_ASYNC */
+}
+
+/*
+
+GLOBAL FUNCTION
+
+ proc_iterate_over_mappings -- call function for every mapped space
+
+SYNOPSIS
+
+ int proc_iterate_over_mappings (int (*func)())
+
+DESCRIPTION
+
+ Given a pointer to a function, call that function for every
+ mapped address space, passing it an open file descriptor for
+ the file corresponding to that mapped address space (if any)
+ and the base address of the mapped space. Quit when we hit
+ the end of the mappings or the function returns nonzero.
+ */
+
+int
+proc_iterate_over_mappings (func)
+ int (*func) PARAMS ((int, CORE_ADDR));
+{
+ int nmap;
+ int fd;
+ int funcstat = 0;
+ struct prmap *prmaps;
+ struct prmap *prmap;
+ struct procinfo *pi;
+
+ pi = current_procinfo;
+
+ if (ioctl (pi->fd, PIOCNMAP, &nmap) == 0)
+ {
+ prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
+ if (ioctl (pi->fd, PIOCMAP, prmaps) == 0)
+ {
+ for (prmap = prmaps; prmap -> pr_size && funcstat == 0; ++prmap)
+ {
+ fd = proc_address_to_fd (pi, (CORE_ADDR) prmap -> pr_vaddr, 0);
+ funcstat = (*func) (fd, (CORE_ADDR) prmap -> pr_vaddr);
+ close (fd);
+ }
+ }
+ }
+ return (funcstat);
+}
+
+#if 0 /* Currently unused */
+/*
+
+GLOBAL FUNCTION
+
+ proc_base_address -- find base address for segment containing address
+
+SYNOPSIS
+
+ CORE_ADDR proc_base_address (CORE_ADDR addr)
+
+DESCRIPTION
+
+ Given an address of a location in the inferior, find and return
+ the base address of the mapped segment containing that address.
+
+ This is used for example, by the shared library support code,
+ where we have the pc value for some location in the shared library
+ where we are stopped, and need to know the base address of the
+ segment containing that address.
+*/
+
+CORE_ADDR
+proc_base_address (addr)
+ CORE_ADDR addr;
+{
+ int nmap;
+ struct prmap *prmaps;
+ struct prmap *prmap;
+ CORE_ADDR baseaddr = 0;
+ struct procinfo *pi;
+
+ pi = current_procinfo;
+
+ if (ioctl (pi->fd, PIOCNMAP, &nmap) == 0)
+ {
+ prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
+ if (ioctl (pi->fd, PIOCMAP, prmaps) == 0)
+ {
+ for (prmap = prmaps; prmap -> pr_size; ++prmap)
+ {
+ if ((prmap -> pr_vaddr <= (caddr_t) addr) &&
+ (prmap -> pr_vaddr + prmap -> pr_size > (caddr_t) addr))
+ {
+ baseaddr = (CORE_ADDR) prmap -> pr_vaddr;
+ break;
+ }
+ }
+ }
+ }
+ return (baseaddr);
+}
+
+#endif /* 0 */
+
+/*
+
+LOCAL FUNCTION
+
+ proc_address_to_fd -- return open fd for file mapped to address
+
+SYNOPSIS
+
+ int proc_address_to_fd (struct procinfo *pi, CORE_ADDR addr, complain)
+
+DESCRIPTION
+
+ Given an address in the current inferior's address space, use the
+ /proc interface to find an open file descriptor for the file that
+ this address was mapped in from. Return -1 if there is no current
+ inferior. Print a warning message if there is an inferior but
+ the address corresponds to no file (IE a bogus address).
+
+*/
+
+static int
+proc_address_to_fd (pi, addr, complain)
+ struct procinfo *pi;
+ CORE_ADDR addr;
+ int complain;
+{
+ int fd = -1;
+
+ if ((fd = ioctl (pi->fd, PIOCOPENM, (caddr_t *) &addr)) < 0)
+ {
+ if (complain)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ warning ("can't find mapped file for address 0x%x", addr);
+ }
+ }
+ return (fd);
+}
+
+
+/* Attach to process PID, then initialize for debugging it
+ and wait for the trace-trap that results from attaching. */
+
+static void
+procfs_attach (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ char *exec_file;
+ int pid;
+
+ if (!args)
+ error_no_arg ("process-id to attach");
+
+ pid = atoi (args);
+
+ if (pid == getpid()) /* Trying to masturbate? */
+ error ("I refuse to debug myself!");
+
+ if (from_tty)
+ {
+ exec_file = (char *) get_exec_file (0);
+
+ if (exec_file)
+ printf_unfiltered ("Attaching to program `%s', %s\n", exec_file, target_pid_to_str (pid));
+ else
+ printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid));
+
+ gdb_flush (gdb_stdout);
+ }
+
+ inferior_pid = pid = do_attach (pid);
+ push_target (&procfs_ops);
+}
+
+
+/* Take a program previously attached to and detaches it.
+ The program resumes execution and will no longer stop
+ on signals, etc. We'd better not have left any breakpoints
+ in the program or it'll die when it hits one. For this
+ to work, it may be necessary for the process to have been
+ previously attached. It *might* work if the program was
+ started via the normal ptrace (PTRACE_TRACEME). */
+
+static void
+procfs_detach (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ int siggnal = 0;
+
+ if (from_tty)
+ {
+ char *exec_file = get_exec_file (0);
+ if (exec_file == 0)
+ exec_file = "";
+ printf_unfiltered ("Detaching from program: %s %s\n",
+ exec_file, target_pid_to_str (inferior_pid));
+ gdb_flush (gdb_stdout);
+ }
+ if (args)
+ siggnal = atoi (args);
+
+ do_detach (siggnal);
+ inferior_pid = 0;
+ unpush_target (&procfs_ops); /* Pop out of handling an inferior */
+}
+
+/* Get ready to modify the registers array. On machines which store
+ individual registers, this doesn't need to do anything. On machines
+ which store all the registers in one fell swoop, this makes sure
+ that registers contains all the registers from the program being
+ debugged. */
+
+static void
+procfs_prepare_to_store ()
+{
+#ifdef CHILD_PREPARE_TO_STORE
+ CHILD_PREPARE_TO_STORE ();
+#endif
+}
+
+/* Print status information about what we're accessing. */
+
+static void
+procfs_files_info (ignore)
+ struct target_ops *ignore;
+{
+ printf_unfiltered ("\tUsing the running image of %s %s via /proc.\n",
+ attach_flag? "attached": "child", target_pid_to_str (inferior_pid));
+}
+
+/* ARGSUSED */
+static void
+procfs_open (arg, from_tty)
+ char *arg;
+ int from_tty;
+{
+ error ("Use the \"run\" command to start a Unix child process.");
+}
+
+/*
+
+LOCAL FUNCTION
+
+ do_attach -- attach to an already existing process
+
+SYNOPSIS
+
+ int do_attach (int pid)
+
+DESCRIPTION
+
+ Attach to an already existing process with the specified process
+ id. If the process is not already stopped, query whether to
+ stop it or not.
+
+NOTES
+
+ The option of stopping at attach time is specific to the /proc
+ versions of gdb. Versions using ptrace force the attachee
+ to stop. (I have changed this version to do so, too. All you
+
+*/
+
+static int
+do_attach (pid)
+ int pid;
+{
+ struct procinfo *pi;
+
+ pi = (struct procinfo *) xmalloc (sizeof (struct procinfo));
+
+ if (!open_proc_file (pid, pi, O_RDWR))
+ {
+ free (pi);
+ perror_with_name (pi->pathname);
+ /* NOTREACHED */
+ }
+
+ pid = pi -> pid;
+
+ /* Add new process to process info list */
+
+ pi->next = procinfo_list;
+ procinfo_list = pi;
+
+ add_fd (pi); /* Add to list for poll/select */
+
+ /* Get current status of process and if it is not already stopped,
+ then stop it. Remember whether or not it was stopped when we first
+ examined it. */
+
+ if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ close_proc_file (pi);
+ error ("PIOCSTATUS failed");
+ }
+ if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
+ {
+ pi->was_stopped = 1;
+ }
+ else
+ {
+ pi->was_stopped = 0;
+ if (1 || query ("Process is currently running, stop it? "))
+ {
+ /* Make it run again when we close it. */
+
+ modify_run_on_last_close_flag (pi->fd, 1);
+
+ if (ioctl (pi->fd, PIOCSTOP, &pi->prstatus) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ close_proc_file (pi);
+ error ("PIOCSTOP failed");
+ }
+ pi->nopass_next_sigstop = 1;
+ }
+ else
+ {
+ printf_unfiltered ("Ok, gdb will wait for %s to stop.\n", target_pid_to_str (pid));
+ }
+ }
+
+ /* Remember some things about the inferior that we will, or might, change
+ so that we can restore them when we detach. */
+
+ ioctl (pi->fd, PIOCGTRACE, &pi->saved_trace);
+ ioctl (pi->fd, PIOCGHOLD, &pi->saved_sighold);
+ ioctl (pi->fd, PIOCGFAULT, &pi->saved_fltset);
+ ioctl (pi->fd, PIOCGENTRY, &pi->saved_entryset);
+ ioctl (pi->fd, PIOCGEXIT, &pi->saved_exitset);
+
+ /* Set up trace and fault sets, as gdb expects them. */
+
+ memset (&pi->prrun, 0, sizeof (pi->prrun));
+ prfillset (&pi->prrun.pr_trace);
+ procfs_notice_signals (pid);
+ prfillset (&pi->prrun.pr_fault);
+ prdelset (&pi->prrun.pr_fault, FLTPAGE);
+
+#ifdef PROCFS_DONT_TRACE_FAULTS
+ premptyset (&pi->prrun.pr_fault);
+#endif
+
+ if (ioctl (pi->fd, PIOCSFAULT, &pi->prrun.pr_fault))
+ {
+ print_sys_errmsg ("PIOCSFAULT failed", errno);
+ }
+ if (ioctl (pi->fd, PIOCSTRACE, &pi->prrun.pr_trace))
+ {
+ print_sys_errmsg ("PIOCSTRACE failed", errno);
+ }
+ attach_flag = 1;
+ return (pid);
+}
+
+/*
+
+LOCAL FUNCTION
+
+ do_detach -- detach from an attached-to process
+
+SYNOPSIS
+
+ void do_detach (int signal)
+
+DESCRIPTION
+
+ Detach from the current attachee.
+
+ If signal is non-zero, the attachee is started running again and sent
+ the specified signal.
+
+ If signal is zero and the attachee was not already stopped when we
+ attached to it, then we make it runnable again when we detach.
+
+ Otherwise, we query whether or not to make the attachee runnable
+ again, since we may simply want to leave it in the state it was in
+ when we attached.
+
+ We report any problems, but do not consider them errors, since we
+ MUST detach even if some things don't seem to go right. This may not
+ be the ideal situation. (FIXME).
+ */
+
+static void
+do_detach (signal)
+ int signal;
+{
+ struct procinfo *pi;
+
+ pi = current_procinfo;
+
+ if (signal)
+ {
+ set_proc_siginfo (pi, signal);
+ }
+ if (ioctl (pi->fd, PIOCSEXIT, &pi->saved_exitset) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCSEXIT failed.\n");
+ }
+ if (ioctl (pi->fd, PIOCSENTRY, &pi->saved_entryset) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCSENTRY failed.\n");
+ }
+ if (ioctl (pi->fd, PIOCSTRACE, &pi->saved_trace) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCSTRACE failed.\n");
+ }
+ if (ioctl (pi->fd, PIOCSHOLD, &pi->saved_sighold) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOSCHOLD failed.\n");
+ }
+ if (ioctl (pi->fd, PIOCSFAULT, &pi->saved_fltset) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCSFAULT failed.\n");
+ }
+ if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCSTATUS failed.\n");
+ }
+ else
+ {
+ if (signal || (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
+ {
+ if (signal || !pi->was_stopped ||
+ query ("Was stopped when attached, make it runnable again? "))
+ {
+ /* Clear any pending signal if we want to detach without
+ a signal. */
+ if (signal == 0)
+ set_proc_siginfo (pi, signal);
+
+ /* Clear any fault that might have stopped it. */
+ if (ioctl (pi->fd, PIOCCFAULT, 0))
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCCFAULT failed.\n");
+ }
+
+ /* Make it run again when we close it. */
+
+ modify_run_on_last_close_flag (pi->fd, 1);
+ }
+ }
}
- premptyset (&exitset);
- praddset (&exitset, SYS_exec);
- praddset (&exitset, SYS_execve);
- if (ioctl (fd, PIOCSEXIT, &exitset) < 0)
+ close_proc_file (pi);
+ attach_flag = 0;
+}
+
+/* emulate wait() as much as possible.
+ Wait for child to do something. Return pid of child, or -1 in case
+ of error; store status in *OURSTATUS.
+
+ Not sure why we can't
+ just use wait(), but it seems to have problems when applied to a
+ process being controlled with the /proc interface.
+
+ We have a race problem here with no obvious solution. We need to let
+ the inferior run until it stops on an event of interest, which means
+ that we need to use the PIOCWSTOP ioctl. However, we cannot use this
+ ioctl if the process is already stopped on something that is not an
+ event of interest, or the call will hang indefinitely. Thus we first
+ use PIOCSTATUS to see if the process is not stopped. If not, then we
+ use PIOCWSTOP. But during the window between the two, if the process
+ stops for any reason that is not an event of interest (such as a job
+ control signal) then gdb will hang. One possible workaround is to set
+ an alarm to wake up every minute of so and check to see if the process
+ is still running, and if so, then reissue the PIOCWSTOP. But this is
+ a real kludge, so has not been implemented. FIXME: investigate
+ alternatives.
+
+ FIXME: Investigate why wait() seems to have problems with programs
+ being control by /proc routines. */
+
+static int
+procfs_wait (pid, ourstatus)
+ int pid;
+ struct target_waitstatus *ourstatus;
+{
+ short what;
+ short why;
+ int statval = 0;
+ int checkerr = 0;
+ int rtnval = -1;
+ struct procinfo *pi;
+
+ if (pid != -1) /* Non-specific process? */
+ pi = NULL;
+ else
+ for (pi = procinfo_list; pi; pi = pi->next)
+ if (pi->had_event)
+ break;
+
+ if (!pi)
{
- perror (procname);
- fflush (stderr);
- _exit (127);
+ wait_again:
+
+ if (pi)
+ pi->had_event = 0;
+
+ pi = wait_fd ();
+ }
+
+ if (pid != -1)
+ for (pi = procinfo_list; pi; pi = pi->next)
+ if (pi->pid == pid && pi->had_event)
+ break;
+
+ if (!pi && !checkerr)
+ goto wait_again;
+
+ if (!checkerr && !(pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
+ {
+ if (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
+ {
+ checkerr++;
+ }
+ }
+ if (checkerr)
+ {
+ if (errno == ENOENT)
+ {
+ rtnval = wait (&statval);
+ if (rtnval != inferior_pid)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCWSTOP, wait failed, returned %d", rtnval);
+ /* NOTREACHED */
+ }
+ }
+ else
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSTATUS or PIOCWSTOP failed.");
+ /* NOTREACHED */
+ }
+ }
+ else if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
+ {
+ rtnval = pi->pid;
+ why = pi->prstatus.pr_why;
+ what = pi->prstatus.pr_what;
+
+ switch (why)
+ {
+ case PR_SIGNALLED:
+ statval = (what << 8) | 0177;
+ break;
+ case PR_SYSENTRY:
+ case PR_SYSEXIT:
+ {
+ int i;
+ int found_handler = 0;
+
+ for (i = 0; i < pi->num_syscall_handlers; i++)
+ if (pi->syscall_handlers[i].syscall_num == what)
+ {
+ found_handler = 1;
+ if (!pi->syscall_handlers[i].func (pi, what, why,
+ &rtnval, &statval))
+ goto wait_again;
+
+ break;
+ }
+
+ if (!found_handler)
+ if (why == PR_SYSENTRY)
+ error ("PR_SYSENTRY, unhandled system call %d", what);
+ else
+ error ("PR_SYSEXIT, unhandled system call %d", what);
+ }
+ break;
+ case PR_REQUESTED:
+ statval = (SIGSTOP << 8) | 0177;
+ break;
+ case PR_JOBCONTROL:
+ statval = (what << 8) | 0177;
+ break;
+ case PR_FAULTED:
+ switch (what)
+ {
+#ifdef FLTWATCH
+ case FLTWATCH:
+ statval = (SIGTRAP << 8) | 0177;
+ break;
+#endif
+#ifdef FLTKWATCH
+ case FLTKWATCH:
+ statval = (SIGTRAP << 8) | 0177;
+ break;
+#endif
+#ifndef FAULTED_USE_SIGINFO
+ /* Irix, contrary to the documentation, fills in 0 for si_signo.
+ Solaris fills in si_signo. I'm not sure about others. */
+ case FLTPRIV:
+ case FLTILL:
+ statval = (SIGILL << 8) | 0177;
+ break;
+ case FLTBPT:
+ case FLTTRACE:
+ statval = (SIGTRAP << 8) | 0177;
+ break;
+ case FLTSTACK:
+ case FLTACCESS:
+ case FLTBOUNDS:
+ statval = (SIGSEGV << 8) | 0177;
+ break;
+ case FLTIOVF:
+ case FLTIZDIV:
+ case FLTFPE:
+ statval = (SIGFPE << 8) | 0177;
+ break;
+ case FLTPAGE: /* Recoverable page fault */
+#endif /* not FAULTED_USE_SIGINFO */
+ default:
+ /* Use the signal which the kernel assigns. This is better than
+ trying to second-guess it from the fault. In fact, I suspect
+ that FLTACCESS can be either SIGSEGV or SIGBUS. */
+ statval = ((pi->prstatus.pr_info.si_signo) << 8) | 0177;
+ break;
+ }
+ break;
+ default:
+ error ("PIOCWSTOP, unknown why %d, what %d", why, what);
+ }
+/* Stop all the other threads when any of them stops. */
+
+ {
+ struct procinfo *procinfo;
+
+ for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
+ {
+ if (!procinfo->had_event)
+ {
+ /* A bug in Solaris (2.5) causes us to hang when trying to
+ stop a stopped process. So, we have to check first in
+ order to avoid the hang. */
+ if (ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus) < 0)
+ {
+ print_sys_errmsg (procinfo->pathname, errno);
+ error ("PIOCSTATUS failed");
+ }
+ if (!(procinfo->prstatus.pr_flags & PR_STOPPED))
+ if (ioctl (procinfo->fd, PIOCSTOP, &procinfo->prstatus) < 0)
+ {
+ print_sys_errmsg (procinfo->pathname, errno);
+ error ("PIOCSTOP failed");
+ }
+ }
+ }
+ }
+ }
+ else
+ {
+ error ("PIOCWSTOP, stopped for unknown/unhandled reason, flags %#x",
+ pi->prstatus.pr_flags);
+ }
+
+ store_waitstatus (ourstatus, statval);
+
+ if (rtnval == -1) /* No more children to wait for */
+ {
+ fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing.\n");
+ /* Claim it exited with unknown signal. */
+ ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+ ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
+ return rtnval;
+ }
+
+ pi->had_event = 0; /* Indicate that we've seen this one */
+ return (rtnval);
+}
+
+/*
+
+LOCAL FUNCTION
+
+ set_proc_siginfo - set a process's current signal info
+
+SYNOPSIS
+
+ void set_proc_siginfo (struct procinfo *pip, int signo);
+
+DESCRIPTION
+
+ Given a pointer to a process info struct in PIP and a signal number
+ in SIGNO, set the process's current signal and its associated signal
+ information. The signal will be delivered to the process immediately
+ after execution is resumed, even if it is being held. In addition,
+ this particular delivery will not cause another PR_SIGNALLED stop
+ even if the signal is being traced.
+
+ If we are not delivering the same signal that the prstatus siginfo
+ struct contains information about, then synthesize a siginfo struct
+ to match the signal we are doing to deliver, make it of the type
+ "generated by a user process", and send this synthesized copy. When
+ used to set the inferior's signal state, this will be required if we
+ are not currently stopped because of a traced signal, or if we decide
+ to continue with a different signal.
+
+ Note that when continuing the inferior from a stop due to receipt
+ of a traced signal, we either have set PRCSIG to clear the existing
+ signal, or we have to call this function to do a PIOCSSIG with either
+ the existing siginfo struct from pr_info, or one we have synthesized
+ appropriately for the signal we want to deliver. Otherwise if the
+ signal is still being traced, the inferior will immediately stop
+ again.
+
+ See siginfo(5) for more details.
+*/
+
+static void
+set_proc_siginfo (pip, signo)
+ struct procinfo *pip;
+ int signo;
+{
+ struct siginfo newsiginfo;
+ struct siginfo *sip;
+
+#ifdef PROCFS_DONT_PIOCSSIG_CURSIG
+ /* With Alpha OSF/1 procfs, the kernel gets really confused if it
+ receives a PIOCSSIG with a signal identical to the current signal,
+ it messes up the current signal. Work around the kernel bug. */
+ if (signo == pip -> prstatus.pr_cursig)
+ return;
+#endif
+
+ if (signo == pip -> prstatus.pr_info.si_signo)
+ {
+ sip = &pip -> prstatus.pr_info;
+ }
+ else
+ {
+ memset ((char *) &newsiginfo, 0, sizeof (newsiginfo));
+ sip = &newsiginfo;
+ sip -> si_signo = signo;
+ sip -> si_code = 0;
+ sip -> si_errno = 0;
+ sip -> si_pid = getpid ();
+ sip -> si_uid = getuid ();
}
+ if (ioctl (pip -> fd, PIOCSSIG, sip) < 0)
+ {
+ print_sys_errmsg (pip -> pathname, errno);
+ warning ("PIOCSSIG failed");
+ }
+}
+
+/* Resume execution of process PID. If STEP is nozero, then
+ just single step it. If SIGNAL is nonzero, restart it with that
+ signal activated. */
+
+static void
+procfs_resume (pid, step, signo)
+ int pid;
+ int step;
+ enum target_signal signo;
+{
+ int signal_to_pass;
+ struct procinfo *pi, *procinfo;
+
+ pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
+
+ errno = 0;
+ pi->prrun.pr_flags = PRSTRACE | PRSFAULT | PRCFAULT;
+
+#if 0
+ /* It should not be necessary. If the user explicitly changes the value,
+ value_assign calls write_register_bytes, which writes it. */
+/* It may not be absolutely necessary to specify the PC value for
+ restarting, but to be safe we use the value that gdb considers
+ to be current. One case where this might be necessary is if the
+ user explicitly changes the PC value that gdb considers to be
+ current. FIXME: Investigate if this is necessary or not. */
+
+#ifdef PRSVADDR_BROKEN
+/* Can't do this under Solaris running on a Sparc, as there seems to be no
+ place to put nPC. In fact, if you use this, nPC seems to be set to some
+ random garbage. We have to rely on the fact that PC and nPC have been
+ written previously via PIOCSREG during a register flush. */
+
+ pi->prrun.pr_vaddr = (caddr_t) *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
+ pi->prrun.pr_flags != PRSVADDR;
+#endif
+#endif
+
+ if (signo == TARGET_SIGNAL_STOP && pi->nopass_next_sigstop)
+ /* When attaching to a child process, if we forced it to stop with
+ a PIOCSTOP, then we will have set the nopass_next_sigstop flag.
+ Upon resuming the first time after such a stop, we explicitly
+ inhibit sending it another SIGSTOP, which would be the normal
+ result of default signal handling. One potential drawback to
+ this is that we will also ignore any attempt to by the user
+ to explicitly continue after the attach with a SIGSTOP. Ultimately
+ this problem should be dealt with by making the routines that
+ deal with the inferior a little smarter, and possibly even allow
+ an inferior to continue running at the same time as gdb. (FIXME?) */
+ signal_to_pass = 0;
+ else if (signo == TARGET_SIGNAL_TSTP
+ && pi->prstatus.pr_cursig == SIGTSTP
+ && pi->prstatus.pr_action.sa_handler == SIG_DFL)
+
+ /* We are about to pass the inferior a SIGTSTP whose action is
+ SIG_DFL. The SIG_DFL action for a SIGTSTP is to stop
+ (notifying the parent via wait()), and then keep going from the
+ same place when the parent is ready for you to keep going. So
+ under the debugger, it should do nothing (as if the program had
+ been stopped and then later resumed. Under ptrace, this
+ happens for us, but under /proc, the system obligingly stops
+ the process, and wait_for_inferior would have no way of
+ distinguishing that type of stop (which indicates that we
+ should just start it again), with a stop due to the pr_trace
+ field of the prrun_t struct.
+
+ Note that if the SIGTSTP is being caught, we *do* need to pass it,
+ because the handler needs to get executed. */
+ signal_to_pass = 0;
+ else
+ signal_to_pass = target_signal_to_host (signo);
+
+ if (signal_to_pass)
+ {
+ set_proc_siginfo (pi, signal_to_pass);
+ }
+ else
+ {
+ pi->prrun.pr_flags |= PRCSIG;
+ }
+ pi->nopass_next_sigstop = 0;
+ if (step)
+ {
+ pi->prrun.pr_flags |= PRSTEP;
+ }
+
+ /* Don't try to start a process unless it's stopped on an
+ `event of interest'. Doing so will cause errors. */
+
+ if ((pi->prstatus.pr_flags & PR_ISTOP)
+ && ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
+ {
+ perror_with_name (pi->pathname);
+ /* NOTREACHED */
+ }
+
+ pi->had_event = 0;
+
+ /* Continue all the other threads that haven't had an event of
+ interest. */
+
+ if (pid == -1)
+ for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
+ {
+ if (pi != procinfo && !procinfo->had_event)
+ {
+ procinfo->prrun.pr_flags &= PRSTEP;
+ procinfo->prrun.pr_flags |= PRCFAULT | PRCSIG;
+ ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus);
+
+ /* Don't try to start a process unless it's stopped on an
+ `event of interest'. Doing so will cause errors. */
+
+ if ((procinfo->prstatus.pr_flags & PR_ISTOP)
+ && ioctl (procinfo->fd, PIOCRUN, &procinfo->prrun) < 0)
+ {
+ if (ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus) < 0)
+ {
+ fprintf_unfiltered(gdb_stderr, "PIOCSTATUS failed, errno=%d\n", errno);
+ }
+ print_sys_errmsg (procinfo->pathname, errno);
+ error ("PIOCRUN failed");
+ }
+ ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus);
+ }
+ }
+}
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_fetch_registers -- fetch current registers from inferior
+
+SYNOPSIS
+
+ void procfs_fetch_registers (int regno)
+
+DESCRIPTION
+
+ Read the current values of the inferior's registers, both the
+ general register set and floating point registers (if supported)
+ and update gdb's idea of their current values.
+
+*/
+
+static void
+procfs_fetch_registers (regno)
+ int regno;
+{
+ struct procinfo *pi;
+
+ pi = current_procinfo;
+
+ if (ioctl (pi->fd, PIOCGREG, &pi->gregset) != -1)
+ {
+ supply_gregset (&pi->gregset);
+ }
+#if defined (FP0_REGNUM)
+ if (ioctl (pi->fd, PIOCGFPREG, &pi->fpregset) != -1)
+ {
+ supply_fpregset (&pi->fpregset);
+ }
+#endif
+}
+
+/*
+
+LOCAL FUNCTION
+
+ proc_init_failed - called whenever /proc access initialization
+fails
+
+SYNOPSIS
+
+ static void proc_init_failed (struct procinfo *pi, char *why)
+
+DESCRIPTION
+
+ This function is called whenever initialization of access to a /proc
+ entry fails. It prints a suitable error message, does some cleanup,
+ and then invokes the standard error processing routine which dumps
+ us back into the command loop.
+ */
+
+static void
+proc_init_failed (pi, why)
+ struct procinfo *pi;
+ char *why;
+{
+ print_sys_errmsg (pi->pathname, errno);
+ kill (pi->pid, SIGKILL);
+ close_proc_file (pi);
+ error (why);
+ /* NOTREACHED */
+}
+
+/*
+
+LOCAL FUNCTION
+
+ close_proc_file - close any currently open /proc entry
+
+SYNOPSIS
+
+ static void close_proc_file (struct procinfo *pip)
+
+DESCRIPTION
+
+ Close any currently open /proc entry and mark the process information
+ entry as invalid. In order to ensure that we don't try to reuse any
+ stale information, the pid, fd, and pathnames are explicitly
+ invalidated, which may be overkill.
+
+ */
+
+static void
+close_proc_file (pip)
+ struct procinfo *pip;
+{
+ struct procinfo *procinfo;
+
+ remove_fd (pip); /* Remove fd from poll/select list */
+
+ close (pip -> fd);
+
+ free (pip -> pathname);
+
+ /* Unlink pip from the procinfo chain. Note pip might not be on the list. */
+
+ if (procinfo_list == pip)
+ procinfo_list = pip->next;
+ else
+ for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
+ if (procinfo->next == pip)
+ procinfo->next = pip->next;
+
+ free (pip);
}
+/*
+
+LOCAL FUNCTION
+
+ open_proc_file - open a /proc entry for a given process id
+
+SYNOPSIS
+
+ static int open_proc_file (int pid, struct procinfo *pip, int mode)
+
+DESCRIPTION
+
+ Given a process id and a mode, close the existing open /proc
+ entry (if any) and open one for the new process id, in the
+ specified mode. Once it is open, then mark the local process
+ information structure as valid, which guarantees that the pid,
+ fd, and pathname fields match an open /proc entry. Returns
+ zero if the open fails, nonzero otherwise.
+
+ Note that the pathname is left intact, even when the open fails,
+ so that callers can use it to construct meaningful error messages
+ rather than just "file open failed".
+
+ Note that for Solaris, the process-id also includes an LWP-id, so we
+ actually attempt to open that. If we are handed a pid with a 0 LWP-id,
+ then we will ask the kernel what it is and add it to the pid. Hence,
+ the pid can be changed by us.
+ */
-#ifdef ATTACH_DETACH
+static int
+open_proc_file (pid, pip, mode)
+ int pid;
+ struct procinfo *pip;
+ int mode;
+{
+ int tmp, tmpfd;
-/*
+ pip -> next = NULL;
+ pip -> had_event = 0;
+ pip -> pathname = xmalloc (32);
+ pip -> pid = pid;
-GLOBAL FUNCTION
+#ifndef PIOCOPENLWP
+ tmp = pid;
+#else
+ tmp = pid & 0xffff;
+#endif
- attach -- attach to an already existing process
+ sprintf (pip -> pathname, PROC_NAME_FMT, tmp);
+ if ((tmpfd = open (pip -> pathname, mode)) < 0)
+ return 0;
-SYNOPSIS
+#ifndef PIOCOPENLWP
+ pip -> fd = tmpfd;
+#else
+ tmp = (pid >> 16) & 0xffff; /* Extract thread id */
- int attach (int pid)
+ if (tmp == 0)
+ { /* Don't know thread id yet */
+ if (ioctl (tmpfd, PIOCSTATUS, &pip -> prstatus) < 0)
+ {
+ print_sys_errmsg (pip -> pathname, errno);
+ close (tmpfd);
+ error ("open_proc_file: PIOCSTATUS failed");
+ }
-DESCRIPTION
+ tmp = pip -> prstatus.pr_who; /* Get thread id from prstatus_t */
+ pip -> pid = (tmp << 16) | pid; /* Update pip */
+ }
- Attach to an already existing process with the specified process
- id. If the process is not already stopped, query whether to
- stop it or not.
+ if ((pip -> fd = ioctl (tmpfd, PIOCOPENLWP, &tmp)) < 0)
+ {
+ close (tmpfd);
+ return 0;
+ }
-NOTES
+#ifdef PIOCSET /* New method */
+ {
+ long pr_flags;
+ pr_flags = PR_ASYNC;
+ ioctl (pip -> fd, PIOCSET, &pr_flags);
+ }
+#endif
- The option of stopping at attach time is specific to the /proc
- versions of gdb. Versions using ptrace force the attachee
- to stop.
+ close (tmpfd); /* All done with main pid */
+#endif /* PIOCOPENLWP */
-*/
+ return 1;
+}
-int
-DEFUN(attach, (pid),
- int pid)
+static char *
+mappingflags (flags)
+ long flags;
{
- if (!open_proc_file (pid))
- {
- perror_with_name (pi.pathname);
- /* NOTREACHED */
- }
-
- /* Get current status of process and if it is not already stopped,
- then stop it. Remember whether or not it was stopped when we first
- examined it. */
+ static char asciiflags[8];
- if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0)
- {
- print_sys_errmsg (pi.pathname, errno);
- close_proc_file ();
- error ("PIOCSTATUS failed");
- }
- if (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
+ strcpy (asciiflags, "-------");
+#if defined (MA_PHYS)
+ if (flags & MA_PHYS) asciiflags[0] = 'd';
+#endif
+ if (flags & MA_STACK) asciiflags[1] = 's';
+ if (flags & MA_BREAK) asciiflags[2] = 'b';
+ if (flags & MA_SHARED) asciiflags[3] = 's';
+ if (flags & MA_READ) asciiflags[4] = 'r';
+ if (flags & MA_WRITE) asciiflags[5] = 'w';
+ if (flags & MA_EXEC) asciiflags[6] = 'x';
+ return (asciiflags);
+}
+
+static void
+info_proc_flags (pip, summary)
+ struct procinfo *pip;
+ int summary;
+{
+ struct trans *transp;
+
+ printf_filtered ("%-32s", "Process status flags:");
+ if (!summary)
{
- pi.was_stopped = 1;
+ printf_filtered ("\n\n");
}
- else
+ for (transp = pr_flag_table; transp -> name != NULL; transp++)
{
- pi.was_stopped = 0;
- if (query ("Process is currently running, stop it? "))
+ if (pip -> prstatus.pr_flags & transp -> value)
{
- if (ioctl (pi.fd, PIOCSTOP, &pi.prstatus) < 0)
+ if (summary)
{
- print_sys_errmsg (pi.pathname, errno);
- close_proc_file ();
- error ("PIOCSTOP failed");
+ printf_filtered ("%s ", transp -> name);
+ }
+ else
+ {
+ printf_filtered ("\t%-16s %s.\n", transp -> name, transp -> desc);
}
}
}
-
- /* Remember some things about the inferior that we will, or might, change
- so that we can restore them when we detach. */
-
- (void) ioctl (pi.fd, PIOCGTRACE, &pi.trace);
- (void) ioctl (pi.fd, PIOCGFAULT, &pi.fltset);
- (void) ioctl (pi.fd, PIOCGENTRY, &pi.entryset);
- (void) ioctl (pi.fd, PIOCGEXIT, &pi.exitset);
-
- /* Set up trace and fault sets, as gdb expects them. */
-
- (void) memset (&pi.prrun, 0, sizeof (pi.prrun));
- prfillset (&pi.prrun.pr_trace);
- prfillset (&pi.prrun.pr_fault);
- prdelset (&pi.prrun.pr_fault, FLTPAGE);
- if (ioctl (pi.fd, PIOCSFAULT, &pi.prrun.pr_fault))
- {
- print_sys_errmsg ("PIOCSFAULT failed");
- }
- if (ioctl (pi.fd, PIOCSTRACE, &pi.prrun.pr_trace))
- {
- print_sys_errmsg ("PIOCSTRACE failed");
- }
- attach_flag = 1;
- return (pid);
+ printf_filtered ("\n");
}
-/*
-
-GLOBAL FUNCTION
-
- detach -- detach from an attached-to process
+static void
+info_proc_stop (pip, summary)
+ struct procinfo *pip;
+ int summary;
+{
+ struct trans *transp;
+ int why;
+ int what;
-SYNOPSIS
+ why = pip -> prstatus.pr_why;
+ what = pip -> prstatus.pr_what;
- void detach (int signal)
+ if (pip -> prstatus.pr_flags & PR_STOPPED)
+ {
+ printf_filtered ("%-32s", "Reason for stopping:");
+ if (!summary)
+ {
+ printf_filtered ("\n\n");
+ }
+ for (transp = pr_why_table; transp -> name != NULL; transp++)
+ {
+ if (why == transp -> value)
+ {
+ if (summary)
+ {
+ printf_filtered ("%s ", transp -> name);
+ }
+ else
+ {
+ printf_filtered ("\t%-16s %s.\n",
+ transp -> name, transp -> desc);
+ }
+ break;
+ }
+ }
+
+ /* Use the pr_why field to determine what the pr_what field means, and
+ print more information. */
+
+ switch (why)
+ {
+ case PR_REQUESTED:
+ /* pr_what is unused for this case */
+ break;
+ case PR_JOBCONTROL:
+ case PR_SIGNALLED:
+ if (summary)
+ {
+ printf_filtered ("%s ", signalname (what));
+ }
+ else
+ {
+ printf_filtered ("\t%-16s %s.\n", signalname (what),
+ safe_strsignal (what));
+ }
+ break;
+ case PR_SYSENTRY:
+ if (summary)
+ {
+ printf_filtered ("%s ", syscallname (what));
+ }
+ else
+ {
+ printf_filtered ("\t%-16s %s.\n", syscallname (what),
+ "Entered this system call");
+ }
+ break;
+ case PR_SYSEXIT:
+ if (summary)
+ {
+ printf_filtered ("%s ", syscallname (what));
+ }
+ else
+ {
+ printf_filtered ("\t%-16s %s.\n", syscallname (what),
+ "Returned from this system call");
+ }
+ break;
+ case PR_FAULTED:
+ if (summary)
+ {
+ printf_filtered ("%s ",
+ lookupname (faults_table, what, "fault"));
+ }
+ else
+ {
+ printf_filtered ("\t%-16s %s.\n",
+ lookupname (faults_table, what, "fault"),
+ lookupdesc (faults_table, what));
+ }
+ break;
+ }
+ printf_filtered ("\n");
+ }
+}
-DESCRIPTION
+static void
+info_proc_siginfo (pip, summary)
+ struct procinfo *pip;
+ int summary;
+{
+ struct siginfo *sip;
- Detach from the current attachee.
+ if ((pip -> prstatus.pr_flags & PR_STOPPED) &&
+ (pip -> prstatus.pr_why == PR_SIGNALLED ||
+ pip -> prstatus.pr_why == PR_FAULTED))
+ {
+ printf_filtered ("%-32s", "Additional signal/fault info:");
+ sip = &pip -> prstatus.pr_info;
+ if (summary)
+ {
+ printf_filtered ("%s ", signalname (sip -> si_signo));
+ if (sip -> si_errno > 0)
+ {
+ printf_filtered ("%s ", errnoname (sip -> si_errno));
+ }
+ if (sip -> si_code <= 0)
+ {
+ printf_filtered ("sent by %s, uid %d ",
+ target_pid_to_str (sip -> si_pid),
+ sip -> si_uid);
+ }
+ else
+ {
+ printf_filtered ("%s ", sigcodename (sip));
+ if ((sip -> si_signo == SIGILL) ||
+ (sip -> si_signo == SIGFPE) ||
+ (sip -> si_signo == SIGSEGV) ||
+ (sip -> si_signo == SIGBUS))
+ {
+ printf_filtered ("addr=%#lx ",
+ (unsigned long) sip -> si_addr);
+ }
+ else if ((sip -> si_signo == SIGCHLD))
+ {
+ printf_filtered ("child %s, status %u ",
+ target_pid_to_str (sip -> si_pid),
+ sip -> si_status);
+ }
+ else if ((sip -> si_signo == SIGPOLL))
+ {
+ printf_filtered ("band %u ", sip -> si_band);
+ }
+ }
+ }
+ else
+ {
+ printf_filtered ("\n\n");
+ printf_filtered ("\t%-16s %s.\n", signalname (sip -> si_signo),
+ safe_strsignal (sip -> si_signo));
+ if (sip -> si_errno > 0)
+ {
+ printf_filtered ("\t%-16s %s.\n",
+ errnoname (sip -> si_errno),
+ safe_strerror (sip -> si_errno));
+ }
+ if (sip -> si_code <= 0)
+ {
+ printf_filtered ("\t%-16u %s\n", sip -> si_pid, /* XXX need target_pid_to_str() */
+ "PID of process sending signal");
+ printf_filtered ("\t%-16u %s\n", sip -> si_uid,
+ "UID of process sending signal");
+ }
+ else
+ {
+ printf_filtered ("\t%-16s %s.\n", sigcodename (sip),
+ sigcodedesc (sip));
+ if ((sip -> si_signo == SIGILL) ||
+ (sip -> si_signo == SIGFPE))
+ {
+ printf_filtered ("\t%#-16lx %s.\n",
+ (unsigned long) sip -> si_addr,
+ "Address of faulting instruction");
+ }
+ else if ((sip -> si_signo == SIGSEGV) ||
+ (sip -> si_signo == SIGBUS))
+ {
+ printf_filtered ("\t%#-16lx %s.\n",
+ (unsigned long) sip -> si_addr,
+ "Address of faulting memory reference");
+ }
+ else if ((sip -> si_signo == SIGCHLD))
+ {
+ printf_filtered ("\t%-16u %s.\n", sip -> si_pid, /* XXX need target_pid_to_str() */
+ "Child process ID");
+ printf_filtered ("\t%-16u %s.\n", sip -> si_status,
+ "Child process exit value or signal");
+ }
+ else if ((sip -> si_signo == SIGPOLL))
+ {
+ printf_filtered ("\t%-16u %s.\n", sip -> si_band,
+ "Band event for POLL_{IN,OUT,MSG}");
+ }
+ }
+ }
+ printf_filtered ("\n");
+ }
+}
- If signal is non-zero, the attachee is started running again and sent
- the specified signal.
+static void
+info_proc_syscalls (pip, summary)
+ struct procinfo *pip;
+ int summary;
+{
+ int syscallnum;
- If signal is zero and the attachee was not already stopped when we
- attached to it, then we make it runnable again when we detach.
+ if (!summary)
+ {
- Otherwise, we query whether or not to make the attachee runnable
- again, since we may simply want to leave it in the state it was in
- when we attached.
+#if 0 /* FIXME: Needs to use gdb-wide configured info about system calls. */
+ if (pip -> prstatus.pr_flags & PR_ASLEEP)
+ {
+ int syscallnum = pip -> prstatus.pr_reg[R_D0];
+ if (summary)
+ {
+ printf_filtered ("%-32s", "Sleeping in system call:");
+ printf_filtered ("%s", syscallname (syscallnum));
+ }
+ else
+ {
+ printf_filtered ("Sleeping in system call '%s'.\n",
+ syscallname (syscallnum));
+ }
+ }
+#endif
- We report any problems, but do not consider them errors, since we
- MUST detach even if some things don't seem to go right. This may not
- be the ideal situation. (FIXME).
- */
+ if (ioctl (pip -> fd, PIOCGENTRY, &pip -> entryset) < 0)
+ {
+ print_sys_errmsg (pip -> pathname, errno);
+ error ("PIOCGENTRY failed");
+ }
+
+ if (ioctl (pip -> fd, PIOCGEXIT, &pip -> exitset) < 0)
+ {
+ print_sys_errmsg (pip -> pathname, errno);
+ error ("PIOCGEXIT failed");
+ }
+
+ printf_filtered ("System call tracing information:\n\n");
+
+ printf_filtered ("\t%-12s %-8s %-8s\n",
+ "System call",
+ "Entry",
+ "Exit");
+ for (syscallnum = 0; syscallnum < MAX_SYSCALLS; syscallnum++)
+ {
+ QUIT;
+ if (syscall_table[syscallnum] != NULL)
+ printf_filtered ("\t%-12s ", syscall_table[syscallnum]);
+ else
+ printf_filtered ("\t%-12d ", syscallnum);
+
+ printf_filtered ("%-8s ",
+ prismember (&pip -> entryset, syscallnum)
+ ? "on" : "off");
+ printf_filtered ("%-8s ",
+ prismember (&pip -> exitset, syscallnum)
+ ? "on" : "off");
+ printf_filtered ("\n");
+ }
+ printf_filtered ("\n");
+ }
+}
-void
-DEFUN(detach, (signal),
- int signal)
+static char *
+signalname (signo)
+ int signo;
{
- if (signal)
+ const char *name;
+ static char locbuf[32];
+
+ name = strsigno (signo);
+ if (name == NULL)
{
- struct siginfo siginfo;
- siginfo.si_signo = signal;
- siginfo.si_code = 0;
- siginfo.si_errno = 0;
- if (ioctl (pi.fd, PIOCSSIG, &siginfo) < 0)
- {
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSSIG failed.\n");
- }
+ sprintf (locbuf, "Signal %d", signo);
}
- if (ioctl (pi.fd, PIOCSEXIT, &pi.exitset) < 0)
+ else
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSEXIT failed.\n");
+ sprintf (locbuf, "%s (%d)", name, signo);
}
- if (ioctl (pi.fd, PIOCSENTRY, &pi.entryset) < 0)
+ return (locbuf);
+}
+
+static char *
+errnoname (errnum)
+ int errnum;
+{
+ const char *name;
+ static char locbuf[32];
+
+ name = strerrno (errnum);
+ if (name == NULL)
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSENTRY failed.\n");
+ sprintf (locbuf, "Errno %d", errnum);
}
- if (ioctl (pi.fd, PIOCSTRACE, &pi.trace) < 0)
+ else
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSTRACE failed.\n");
+ sprintf (locbuf, "%s (%d)", name, errnum);
}
- if (ioctl (pi.fd, PIOCSFAULT, &pi.fltset) < 0)
+ return (locbuf);
+}
+
+static void
+info_proc_signals (pip, summary)
+ struct procinfo *pip;
+ int summary;
+{
+ int signo;
+
+ if (!summary)
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSFAULT failed.\n");
+ if (ioctl (pip -> fd, PIOCGTRACE, &pip -> trace) < 0)
+ {
+ print_sys_errmsg (pip -> pathname, errno);
+ error ("PIOCGTRACE failed");
+ }
+
+ printf_filtered ("Disposition of signals:\n\n");
+ printf_filtered ("\t%-15s %-8s %-8s %-8s %s\n\n",
+ "Signal", "Trace", "Hold", "Pending", "Description");
+ for (signo = 0; signo < NSIG; signo++)
+ {
+ QUIT;
+ printf_filtered ("\t%-15s ", signalname (signo));
+ printf_filtered ("%-8s ",
+ prismember (&pip -> trace, signo)
+ ? "on" : "off");
+ printf_filtered ("%-8s ",
+ prismember (&pip -> prstatus.pr_sighold, signo)
+ ? "on" : "off");
+
+#ifdef PROCFS_SIGPEND_OFFSET
+ /* Alpha OSF/1 numbers the pending signals from 1. */
+ printf_filtered ("%-8s ",
+ (signo ? prismember (&pip -> prstatus.pr_sigpend,
+ signo - 1)
+ : 0)
+ ? "yes" : "no");
+#else
+ printf_filtered ("%-8s ",
+ prismember (&pip -> prstatus.pr_sigpend, signo)
+ ? "yes" : "no");
+#endif
+ printf_filtered (" %s\n", safe_strsignal (signo));
+ }
+ printf_filtered ("\n");
}
- if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0)
+}
+
+static void
+info_proc_faults (pip, summary)
+ struct procinfo *pip;
+ int summary;
+{
+ struct trans *transp;
+
+ if (!summary)
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSTATUS failed.\n");
+ if (ioctl (pip -> fd, PIOCGFAULT, &pip -> fltset) < 0)
+ {
+ print_sys_errmsg (pip -> pathname, errno);
+ error ("PIOCGFAULT failed");
+ }
+
+ printf_filtered ("Current traced hardware fault set:\n\n");
+ printf_filtered ("\t%-12s %-8s\n", "Fault", "Trace");
+
+ for (transp = faults_table; transp -> name != NULL; transp++)
+ {
+ QUIT;
+ printf_filtered ("\t%-12s ", transp -> name);
+ printf_filtered ("%-8s", prismember (&pip -> fltset, transp -> value)
+ ? "on" : "off");
+ printf_filtered ("\n");
+ }
+ printf_filtered ("\n");
}
- else
+}
+
+static void
+info_proc_mappings (pip, summary)
+ struct procinfo *pip;
+ int summary;
+{
+ int nmap;
+ struct prmap *prmaps;
+ struct prmap *prmap;
+
+ if (!summary)
{
- if (signal || (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
+ printf_filtered ("Mapped address spaces:\n\n");
+#ifdef BFD_HOST_64_BIT
+ printf_filtered (" %18s %18s %10s %10s %7s\n",
+#else
+ printf_filtered ("\t%10s %10s %10s %10s %7s\n",
+#endif
+ "Start Addr",
+ " End Addr",
+ " Size",
+ " Offset",
+ "Flags");
+ if (ioctl (pip -> fd, PIOCNMAP, &nmap) == 0)
{
- if (signal || !pi.was_stopped ||
- query ("Was stopped when attached, make it runnable again? "))
+ prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
+ if (ioctl (pip -> fd, PIOCMAP, prmaps) == 0)
{
- (void) memset (&pi.prrun, 0, sizeof (pi.prrun));
- pi.prrun.pr_flags = PRCFAULT;
- if (ioctl (pi.fd, PIOCRUN, &pi.prrun))
+ for (prmap = prmaps; prmap -> pr_size; ++prmap)
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCRUN failed.\n");
+#ifdef BFD_HOST_64_BIT
+ printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
+#else
+ printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
+#endif
+ (unsigned long)prmap -> pr_vaddr,
+ (unsigned long)prmap -> pr_vaddr
+ + prmap -> pr_size - 1,
+ prmap -> pr_size,
+ prmap -> pr_off,
+ mappingflags (prmap -> pr_mflags));
}
}
}
+ printf_filtered ("\n");
}
- close_proc_file ();
- attach_flag = 0;
}
-#endif /* ATTACH_DETACH */
-
/*
-GLOBAL FUNCTION
+LOCAL FUNCTION
- proc_wait -- emulate wait() as much as possible
+ info_proc -- implement the "info proc" command
SYNOPSIS
- int proc_wait (int *statloc)
+ void info_proc (char *args, int from_tty)
DESCRIPTION
- Try to emulate wait() as much as possible. Not sure why we can't
- just use wait(), but it seems to have problems when applied to a
- process being controlled with the /proc interface.
+ Implement gdb's "info proc" command by using the /proc interface
+ to print status information about any currently running process.
-NOTES
+ Examples of the use of "info proc" are:
- We have a race problem here with no obvious solution. We need to let
- the inferior run until it stops on an event of interest, which means
- that we need to use the PIOCWSTOP ioctl. However, we cannot use this
- ioctl if the process is already stopped on something that is not an
- event of interest, or the call will hang indefinitely. Thus we first
- use PIOCSTATUS to see if the process is not stopped. If not, then we
- use PIOCWSTOP. But during the window between the two, if the process
- stops for any reason that is not an event of interest (such as a job
- control signal) then gdb will hang. One possible workaround is to set
- an alarm to wake up every minute of so and check to see if the process
- is still running, and if so, then reissue the PIOCWSTOP. But this is
- a real kludge, so has not been implemented. FIXME: investigate
- alternatives.
-
- FIXME: Investigate why wait() seems to have problems with programs
- being control by /proc routines.
+ info proc (prints summary info for current inferior)
+ info proc 123 (prints summary info for process with pid 123)
+ info proc mappings (prints address mappings)
+ info proc times (prints process/children times)
+ info proc id (prints pid, ppid, gid, sid, etc)
+ FIXME: i proc id not implemented.
+ info proc status (prints general process state info)
+ FIXME: i proc status not implemented.
+ info proc signals (prints info about signal handling)
+ info proc all (prints all info)
*/
-int
-DEFUN(proc_wait, (statloc),
- int *statloc)
+static void
+info_proc (args, from_tty)
+ char *args;
+ int from_tty;
{
- short what;
- short why;
- int statval = 0;
- int checkerr = 0;
- int rtnval = -1;
-
- if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0)
- {
- checkerr++;
- }
- else if (!(pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
+ int pid = inferior_pid;
+ struct procinfo *pip;
+ struct cleanup *old_chain;
+ char **argv;
+ int argsize;
+ int summary = 1;
+ int flags = 0;
+ int syscalls = 0;
+ int signals = 0;
+ int faults = 0;
+ int mappings = 0;
+ int times = 0;
+ int id = 0;
+ int status = 0;
+ int all = 0;
+ int nlwp;
+ int *lwps;
+
+ old_chain = make_cleanup (null_cleanup, 0);
+
+ /* Default to using the current inferior if no pid specified. Note
+ that inferior_pid may be 0, hence we set okerr. */
+
+ pip = find_procinfo (inferior_pid, 1);
+
+ if (args != NULL)
{
- if (ioctl (pi.fd, PIOCWSTOP, &pi.prstatus) < 0)
+ if ((argv = buildargv (args)) == NULL)
{
- checkerr++;
+ nomem (0);
}
- }
- if (checkerr)
+ make_cleanup (freeargv, (char *) argv);
+
+ while (*argv != NULL)
+ {
+ argsize = strlen (*argv);
+ if (argsize >= 1 && strncmp (*argv, "all", argsize) == 0)
+ {
+ summary = 0;
+ all = 1;
+ }
+ else if (argsize >= 2 && strncmp (*argv, "faults", argsize) == 0)
+ {
+ summary = 0;
+ faults = 1;
+ }
+ else if (argsize >= 2 && strncmp (*argv, "flags", argsize) == 0)
+ {
+ summary = 0;
+ flags = 1;
+ }
+ else if (argsize >= 1 && strncmp (*argv, "id", argsize) == 0)
+ {
+ summary = 0;
+ id = 1;
+ }
+ else if (argsize >= 1 && strncmp (*argv, "mappings", argsize) == 0)
+ {
+ summary = 0;
+ mappings = 1;
+ }
+ else if (argsize >= 2 && strncmp (*argv, "signals", argsize) == 0)
+ {
+ summary = 0;
+ signals = 1;
+ }
+ else if (argsize >= 2 && strncmp (*argv, "status", argsize) == 0)
+ {
+ summary = 0;
+ status = 1;
+ }
+ else if (argsize >= 2 && strncmp (*argv, "syscalls", argsize) == 0)
+ {
+ summary = 0;
+ syscalls = 1;
+ }
+ else if (argsize >= 1 && strncmp (*argv, "times", argsize) == 0)
+ {
+ summary = 0;
+ times = 1;
+ }
+ else if ((pid = atoi (*argv)) > 0)
+ {
+ pip = (struct procinfo *) xmalloc (sizeof (struct procinfo));
+ memset (pip, 0, sizeof (*pip));
+
+ pip->pid = pid;
+ if (!open_proc_file (pid, pip, O_RDONLY))
+ {
+ perror_with_name (pip -> pathname);
+ /* NOTREACHED */
+ }
+ pid = pip->pid;
+ make_cleanup (close_proc_file, pip);
+ }
+ else if (**argv != '\000')
+ {
+ error ("Unrecognized or ambiguous keyword `%s'.", *argv);
+ }
+ argv++;
+ }
+ }
+
+ /* If we don't have a valid open process at this point, then we have no
+ inferior or didn't specify a specific pid. */
+
+ if (!pip)
{
- if (errno == ENOENT)
+ error ("\
+No process. Start debugging a program or specify an explicit process ID.");
+ }
+ if (ioctl (pip -> fd, PIOCSTATUS, &(pip -> prstatus)) < 0)
+ {
+ print_sys_errmsg (pip -> pathname, errno);
+ error ("PIOCSTATUS failed");
+ }
+
+#ifdef PIOCLWPIDS
+ nlwp = pip->prstatus.pr_nlwp;
+ lwps = alloca ((2 * nlwp + 2) * sizeof (id_t));
+
+ if (ioctl (pip->fd, PIOCLWPIDS, lwps))
+ {
+ print_sys_errmsg (pip -> pathname, errno);
+ error ("PIOCSTATUS failed");
+ }
+#else /* PIOCLWPIDS */
+ nlwp = 1;
+ lwps = alloca ((2 * nlwp + 2) * sizeof *lwps);
+ lwps[0] = 0;
+#endif /* PIOCLWPIDS */
+
+ for (; nlwp > 0; nlwp--, lwps++)
+ {
+ pip = find_procinfo ((*lwps << 16) | pid, 1);
+
+ if (!pip)
{
- rtnval = wait (&statval);
- if (rtnval != inferior_pid)
+ pip = (struct procinfo *) xmalloc (sizeof (struct procinfo));
+ memset (pip, 0, sizeof (*pip));
+ if (!open_proc_file ((*lwps << 16) | pid, pip, O_RDONLY))
+ continue;
+
+ make_cleanup (close_proc_file, pip);
+
+ if (ioctl (pip -> fd, PIOCSTATUS, &(pip -> prstatus)) < 0)
{
- error ("PIOCWSTOP, wait failed, returned %d", rtnval);
- /* NOTREACHED */
+ print_sys_errmsg (pip -> pathname, errno);
+ error ("PIOCSTATUS failed");
}
}
- else
+
+ /* Print verbose information of the requested type(s), or just a summary
+ of the information for all types. */
+
+ printf_filtered ("\nInformation for %s.%d:\n\n", pip -> pathname, *lwps);
+ if (summary || all || flags)
{
- print_sys_errmsg (pi.pathname, errno);
- error ("PIOCSTATUS or PIOCWSTOP failed.");
- /* NOTREACHED */
+ info_proc_flags (pip, summary);
}
- }
- else if (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
- {
- rtnval = pi.prstatus.pr_pid;
- why = pi.prstatus.pr_why;
- what = pi.prstatus.pr_what;
- if (why == PR_SIGNALLED)
+ if (summary || all)
{
- statval = (what << 8) | 0177;
+ info_proc_stop (pip, summary);
}
- else if ((why == PR_SYSEXIT) &&
- (what == SYS_exec || what == SYS_execve))
+ if (summary || all || signals || faults)
{
- statval = (SIGTRAP << 8) | 0177;
+ info_proc_siginfo (pip, summary);
}
- else if (why == PR_REQUESTED)
+ if (summary || all || syscalls)
{
- statval = (SIGSTOP << 8) | 0177;
+ info_proc_syscalls (pip, summary);
}
- else if (why == PR_JOBCONTROL)
+ if (summary || all || mappings)
{
- statval = (what << 8) | 0177;
+ info_proc_mappings (pip, summary);
}
- else if (why == PR_FAULTED)
+ if (summary || all || signals)
{
- switch (what)
- {
- case FLTPRIV:
- case FLTILL:
- statval = (SIGILL << 8) | 0177;
- break;
- case FLTBPT:
- case FLTTRACE:
- statval = (SIGTRAP << 8) | 0177;
- break;
- case FLTSTACK:
- case FLTACCESS:
- case FLTBOUNDS:
- statval = (SIGSEGV << 8) | 0177;
- break;
- case FLTIOVF:
- case FLTIZDIV:
- case FLTFPE:
- statval = (SIGFPE << 8) | 0177;
- break;
- case FLTPAGE: /* Recoverable page fault */
- default:
- rtnval = -1;
- error ("PIOCWSTOP, unknown why %d, what %d", why, what);
- /* NOTREACHED */
- }
+ info_proc_signals (pip, summary);
}
- else
+ if (summary || all || faults)
{
- rtnval = -1;
- error ("PIOCWSTOP, unknown why %d, what %d", why, what);
- /* NOTREACHED */
+ info_proc_faults (pip, summary);
}
+ printf_filtered ("\n");
+
+ /* All done, deal with closing any temporary process info structure,
+ freeing temporary memory , etc. */
+
+ do_cleanups (old_chain);
}
- else
- {
- error ("PIOCWSTOP, stopped for unknown/unhandled reason, flags %#x",
- pi.prstatus.pr_flags);
- /* NOTREACHED */
- }
- if (statloc)
- {
- *statloc = statval;
- }
- return (rtnval);
}
/*
-GLOBAL FUNCTION
+LOCAL FUNCTION
- child_resume -- resume execution of the inferior process
+ modify_inherit_on_fork_flag - Change the inherit-on-fork flag
SYNOPSIS
- void child_resume (int step, int signal)
+ void modify_inherit_on_fork_flag (fd, flag)
DESCRIPTION
- Resume execution of the inferior process. If STEP is nozero, then
- just single step it. If SIGNAL is nonzero, restart it with that
- signal activated.
+ Call this routine to modify the inherit-on-fork flag. This routine is
+ just a nice wrapper to hide the #ifdefs needed by various systems to
+ control this flag.
-NOTE
-
- It may not be absolutely necessary to specify the PC value for
- restarting, but to be safe we use the value that gdb considers
- to be current. One case where this might be necessary is if the
- user explicitly changes the PC value that gdb considers to be
- current. FIXME: Investigate if this is necessary or not.
*/
-void
-DEFUN(child_resume, (step, signal),
- int step AND
- int signal)
+static void
+modify_inherit_on_fork_flag (fd, flag)
+ int fd;
+ int flag;
{
- errno = 0;
- pi.prrun.pr_flags = PRSVADDR | PRSTRACE | PRSFAULT | PRCFAULT;
- pi.prrun.pr_vaddr = (caddr_t) *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
- if (signal)
- {
- if (signal != pi.prstatus.pr_cursig)
- {
- struct siginfo siginfo;
- siginfo.si_signo = signal;
- siginfo.si_code = 0;
- siginfo.si_errno = 0;
- (void) ioctl (pi.fd, PIOCSSIG, &siginfo);
- }
- }
+#ifdef PIOCSET
+ long pr_flags;
+#endif
+ int retval;
+
+#ifdef PIOCSET /* New method */
+ pr_flags = PR_FORK;
+ if (flag)
+ retval = ioctl (fd, PIOCSET, &pr_flags);
else
- {
- pi.prrun.pr_flags |= PRCSIG;
- }
- if (step)
- {
- pi.prrun.pr_flags |= PRSTEP;
- }
- if (ioctl (pi.fd, PIOCRUN, &pi.prrun) != 0)
- {
- perror_with_name (pi.pathname);
- /* NOTREACHED */
- }
+ retval = ioctl (fd, PIOCRESET, &pr_flags);
+
+#else
+#ifdef PIOCSFORK /* Original method */
+ if (flag)
+ retval = ioctl (fd, PIOCSFORK, NULL);
+ else
+ retval = ioctl (fd, PIOCRFORK, NULL);
+#else
+ Neither PR_FORK nor PIOCSFORK exist!!!
+#endif
+#endif
+
+ if (!retval)
+ return;
+
+ print_sys_errmsg ("modify_inherit_on_fork_flag", errno);
+ error ("PIOCSFORK or PR_FORK modification failed");
}
/*
-GLOBAL FUNCTION
+LOCAL FUNCTION
- fetch_inferior_registers -- fetch current registers from inferior
+ modify_run_on_last_close_flag - Change the run-on-last-close flag
SYNOPSIS
- void fetch_inferior_registers (void)
+ void modify_run_on_last_close_flag (fd, flag)
DESCRIPTION
- Read the current values of the inferior's registers, both the
- general register set and floating point registers (if supported)
- and update gdb's idea of their current values.
+ Call this routine to modify the run-on-last-close flag. This routine
+ is just a nice wrapper to hide the #ifdefs needed by various systems to
+ control this flag.
-*/
+ */
-void
-DEFUN_VOID(fetch_inferior_registers)
+static void
+modify_run_on_last_close_flag (fd, flag)
+ int fd;
+ int flag;
{
- if (ioctl (pi.fd, PIOCGREG, &pi.gregset) != -1)
- {
- supply_gregset (&pi.gregset);
- }
-#if defined (FP0_REGNUM)
- if (ioctl (pi.fd, PIOCGFPREG, &pi.fpregset) != -1)
- {
- supply_fpregset (&pi.fpregset);
- }
+#ifdef PIOCSET
+ long pr_flags;
+#endif
+ int retval;
+
+#ifdef PIOCSET /* New method */
+ pr_flags = PR_RLC;
+ if (flag)
+ retval = ioctl (fd, PIOCSET, &pr_flags);
+ else
+ retval = ioctl (fd, PIOCRESET, &pr_flags);
+
+#else
+#ifdef PIOCSRLC /* Original method */
+ if (flag)
+ retval = ioctl (fd, PIOCSRLC, NULL);
+ else
+ retval = ioctl (fd, PIOCRRLC, NULL);
+#else
+ Neither PR_RLC nor PIOCSRLC exist!!!
#endif
+#endif
+
+ if (!retval)
+ return;
+
+ print_sys_errmsg ("modify_run_on_last_close_flag", errno);
+ error ("PIOCSRLC or PR_RLC modification failed");
}
/*
-GLOBAL FUNCTION
+LOCAL FUNCTION
- fetch_core_registers -- fetch current registers from core file data
+ procfs_clear_syscall_trap -- Deletes the trap for the specified system call.
SYNOPSIS
- void fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
- int which)
+ void procfs_clear_syscall_trap (struct procinfo *, int syscall_num, int errok)
DESCRIPTION
- Read the values of either the general register set (WHICH equals 0)
- or the floating point register set (WHICH equals 2) from the core
- file data (pointed to by CORE_REG_SECT), and update gdb's idea of
- their current values. The CORE_REG_SIZE parameter is ignored.
-
-NOTES
-
- Use the indicated sizes to validate the gregset and fpregset
- structures.
-*/
+ This function function disables traps for the specified system call.
+ errok is non-zero if errors should be ignored.
+ */
-void
-fetch_core_registers (core_reg_sect, core_reg_size, which)
- char *core_reg_sect;
- unsigned core_reg_size;
- int which;
+static void
+procfs_clear_syscall_trap (pi, syscall_num, errok)
+ struct procinfo *pi;
+ int syscall_num;
+ int errok;
{
+ sysset_t sysset;
+ int goterr, i;
+
+ goterr = ioctl (pi->fd, PIOCGENTRY, &sysset) < 0;
- if (which == 0)
+ if (goterr && !errok)
{
- if (core_reg_size != sizeof (pi.gregset))
- {
- warning ("wrong size gregset struct in core file");
- }
- else
- {
- (void) memcpy ((char *) &pi.gregset, core_reg_sect,
- sizeof (pi.gregset));
- supply_gregset (&pi.gregset);
- }
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCGENTRY failed");
}
- else if (which == 2)
+
+ if (!goterr)
{
- if (core_reg_size != sizeof (pi.fpregset))
+ prdelset (&sysset, syscall_num);
+
+ if ((ioctl (pi->fd, PIOCSENTRY, &sysset) < 0) && !errok)
{
- warning ("wrong size fpregset struct in core file");
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSENTRY failed");
}
- else
+ }
+
+ goterr = ioctl (pi->fd, PIOCGEXIT, &sysset) < 0;
+
+ if (goterr && !errok)
+ {
+ procfs_clear_syscall_trap (pi, syscall_num, 1);
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCGEXIT failed");
+ }
+
+ if (!goterr)
+ {
+ praddset (&sysset, syscall_num);
+
+ if ((ioctl (pi->fd, PIOCSEXIT, &sysset) < 0) && !errok)
{
- (void) memcpy ((char *) &pi.fpregset, core_reg_sect,
- sizeof (pi.fpregset));
-#if defined (FP0_REGNUM)
- supply_fpregset (&pi.fpregset);
-#endif
+ procfs_clear_syscall_trap (pi, syscall_num, 1);
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSEXIT failed");
}
}
+
+ if (!pi->syscall_handlers)
+ {
+ if (!errok)
+ error ("procfs_clear_syscall_trap: syscall_handlers is empty");
+ return;
+ }
+
+ /* Remove handler func from the handler list */
+
+ for (i = 0; i < pi->num_syscall_handlers; i++)
+ if (pi->syscall_handlers[i].syscall_num == syscall_num)
+ {
+ if (i + 1 != pi->num_syscall_handlers)
+ { /* Not the last entry.
+ Move subsequent entries fwd. */
+ memcpy (&pi->syscall_handlers[i], &pi->syscall_handlers[i + 1],
+ (pi->num_syscall_handlers - i - 1)
+ * sizeof (struct procfs_syscall_handler));
+ }
+
+ pi->syscall_handlers = xrealloc (pi->syscall_handlers,
+ (pi->num_syscall_handlers - 1)
+ * sizeof (struct procfs_syscall_handler));
+ pi->num_syscall_handlers--;
+ return;
+ }
+
+ if (!errok)
+ error ("procfs_clear_syscall_trap: Couldn't find handler for sys call %d",
+ syscall_num);
}
/*
LOCAL FUNCTION
- proc_init_failed - called whenever /proc access initialization fails
+ procfs_set_syscall_trap -- arrange for a function to be called when the
+ child executes the specified system call.
SYNOPSIS
- static void proc_init_failed (char *why)
+ void procfs_set_syscall_trap (struct procinfo *, int syscall_num, int flags,
+ syscall_func_t *function)
DESCRIPTION
- This function is called whenever initialization of access to a /proc
- entry fails. It prints a suitable error message, does some cleanup,
- and then invokes the standard error processing routine which dumps
- us back into the command loop.
+ This function sets up an entry and/or exit trap for the specified system
+ call. When the child executes the specified system call, your function
+ will be called with the call #, a flag that indicates entry or exit, and
+ pointers to rtnval and statval (which are used by procfs_wait). The
+ function should return non-zero if something interesting happened, zero
+ otherwise.
*/
static void
-DEFUN(proc_init_failed, (why),
- char *why)
+procfs_set_syscall_trap (pi, syscall_num, flags, func)
+ struct procinfo *pi;
+ int syscall_num;
+ int flags;
+ syscall_func_t *func;
{
- print_sys_errmsg (pi.pathname, errno);
- (void) kill (pi.pid, SIGKILL);
- close_proc_file ();
- error (why);
- /* NOTREACHED */
+ sysset_t sysset;
+
+ if (flags & PROCFS_SYSCALL_ENTRY)
+ {
+ if (ioctl (pi->fd, PIOCGENTRY, &sysset) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCGENTRY failed");
+ }
+
+ praddset (&sysset, syscall_num);
+
+ if (ioctl (pi->fd, PIOCSENTRY, &sysset) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSENTRY failed");
+ }
+ }
+
+ if (flags & PROCFS_SYSCALL_EXIT)
+ {
+ if (ioctl (pi->fd, PIOCGEXIT, &sysset) < 0)
+ {
+ procfs_clear_syscall_trap (pi, syscall_num, 1);
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCGEXIT failed");
+ }
+
+ praddset (&sysset, syscall_num);
+
+ if (ioctl (pi->fd, PIOCSEXIT, &sysset) < 0)
+ {
+ procfs_clear_syscall_trap (pi, syscall_num, 1);
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSEXIT failed");
+ }
+ }
+
+ if (!pi->syscall_handlers)
+ {
+ pi->syscall_handlers = xmalloc (sizeof (struct procfs_syscall_handler));
+ pi->syscall_handlers[0].syscall_num = syscall_num;
+ pi->syscall_handlers[0].func = func;
+ pi->num_syscall_handlers = 1;
+ }
+ else
+ {
+ int i;
+
+ for (i = 0; i < pi->num_syscall_handlers; i++)
+ if (pi->syscall_handlers[i].syscall_num == syscall_num)
+ {
+ pi->syscall_handlers[i].func = func;
+ return;
+ }
+
+ pi->syscall_handlers = xrealloc (pi->syscall_handlers, (i + 1)
+ * sizeof (struct procfs_syscall_handler));
+ pi->syscall_handlers[i].syscall_num = syscall_num;
+ pi->syscall_handlers[i].func = func;
+ pi->num_syscall_handlers++;
+ }
}
+#ifdef SYS_lwp_create
+
/*
LOCAL FUNCTION
- close_proc_file - close any currently open /proc entry
+ procfs_lwp_creation_handler - handle exit from the _lwp_create syscall
SYNOPSIS
- static void close_proc_file (void)
+ int procfs_lwp_creation_handler (pi, syscall_num, why, rtnvalp, statvalp)
DESCRIPTION
- Close any currently open /proc entry and mark the process information
- entry as invalid. In order to ensure that we don't try to reuse any
- stale information, the pid, fd, and pathnames are explicitly
- invalidated, which may be overkill.
+ This routine is called both when an inferior process and it's new lwp
+ are about to finish a _lwp_create() system call. This is the system
+ call that Solaris uses to create a lightweight process. When the
+ target process gets this event, we can look at sysarg[2] to find the
+ new childs lwp ID, and create a procinfo struct from that. After that,
+ we pretend that we got a SIGTRAP, and return non-zero to tell
+ procfs_wait to wake up. Subsequently, wait_for_inferior gets woken up,
+ sees the new process and continues it.
+
+ When we see the child exiting from lwp_create, we just contine it,
+ since everything was handled when the parent trapped.
+NOTES
+ In effect, we are only paying attention to the parent's completion of
+ the lwp_create syscall. If we only paid attention to the child
+ instead, then we wouldn't detect the creation of a suspended thread.
*/
-static void
-DEFUN_VOID(close_proc_file)
+static int
+procfs_lwp_creation_handler (pi, syscall_num, why, rtnvalp, statvalp)
+ struct procinfo *pi;
+ int syscall_num;
+ int why;
+ int *rtnvalp;
+ int *statvalp;
{
- pi.pid = 0;
- if (pi.valid)
- {
- (void) close (pi.fd);
+ int lwp_id;
+ struct procinfo *childpi;
+
+ /* We've just detected the completion of an lwp_create system call. Now we
+ need to setup a procinfo struct for this thread, and notify the thread
+ system of the new arrival. */
+
+ /* If lwp_create failed, then nothing interesting happened. Continue the
+ process and go back to sleep. */
+
+ if (pi->prstatus.pr_reg[R_PSR] & PS_FLAG_CARRY)
+ { /* _lwp_create failed */
+ pi->prrun.pr_flags &= PRSTEP;
+ pi->prrun.pr_flags |= PRCFAULT;
+
+ if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
+ perror_with_name (pi->pathname);
+
+ return 0;
}
- pi.fd = -1;
- if (pi.pathname)
- {
- free (pi.pathname);
- pi.pathname = NULL;
+
+ /* At this point, the new thread is stopped at it's first instruction, and
+ the parent is stopped at the exit from lwp_create. */
+
+ if (pi->new_child) /* Child? */
+ { /* Yes, just continue it */
+ pi->prrun.pr_flags &= PRSTEP;
+ pi->prrun.pr_flags |= PRCFAULT;
+
+ if ((pi->prstatus.pr_flags & PR_ISTOP)
+ && ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
+ perror_with_name (pi->pathname);
+
+ pi->new_child = 0; /* No longer new */
+
+ return 0;
}
- pi.valid = 0;
+
+ /* We're the proud parent of a new thread. Setup an exit trap for lwp_create
+ in the child and continue the parent. */
+
+ /* Third arg is pointer to new thread id. */
+ lwp_id = read_memory_integer (pi->prstatus.pr_sysarg[2], sizeof (int));
+
+ lwp_id = (lwp_id << 16) | PIDGET (pi->pid);
+
+ childpi = create_procinfo (lwp_id);
+
+ /* The new process has actually inherited the lwp_create syscall trap from
+ it's parent, but we still have to call this to register a handler for
+ that child. */
+
+ procfs_set_syscall_trap (childpi, SYS_lwp_create, PROCFS_SYSCALL_EXIT,
+ procfs_lwp_creation_handler);
+
+ childpi->new_child = 1; /* Flag this as an unseen child process */
+
+ *rtnvalp = lwp_id; /* the new arrival. */
+ *statvalp = (SIGTRAP << 8) | 0177;
+
+ return 1;
}
+#endif /* SYS_lwp_create */
-/*
+/* Fork an inferior process, and start debugging it with /proc. */
-LOCAL FUNCTION
+static void
+procfs_create_inferior (exec_file, allargs, env)
+ char *exec_file;
+ char *allargs;
+ char **env;
+{
+ char *shell_file = getenv ("SHELL");
+ char *tryname;
+ if (shell_file != NULL && strchr (shell_file, '/') == NULL)
+ {
- open_proc_file - open a /proc entry for a given process id
+ /* We will be looking down the PATH to find shell_file. If we
+ just do this the normal way (via execlp, which operates by
+ attempting an exec for each element of the PATH until it
+ finds one which succeeds), then there will be an exec for
+ each failed attempt, each of which will cause a PR_SYSEXIT
+ stop, and we won't know how to distinguish the PR_SYSEXIT's
+ for these failed execs with the ones for successful execs
+ (whether the exec has succeeded is stored at that time in the
+ carry bit or some such architecture-specific and
+ non-ABI-specified place).
+
+ So I can't think of anything better than to search the PATH
+ now. This has several disadvantages: (1) There is a race
+ condition; if we find a file now and it is deleted before we
+ exec it, we lose, even if the deletion leaves a valid file
+ further down in the PATH, (2) there is no way to know exactly
+ what an executable (in the sense of "capable of being
+ exec'd") file is. Using access() loses because it may lose
+ if the caller is the superuser; failing to use it loses if
+ there are ACLs or some such. */
+
+ char *p;
+ char *p1;
+ /* FIXME-maybe: might want "set path" command so user can change what
+ path is used from within GDB. */
+ char *path = getenv ("PATH");
+ int len;
+ struct stat statbuf;
+
+ if (path == NULL)
+ path = "/bin:/usr/bin";
+
+ tryname = alloca (strlen (path) + strlen (shell_file) + 2);
+ for (p = path; p != NULL; p = p1 ? p1 + 1: NULL)
+ {
+ p1 = strchr (p, ':');
+ if (p1 != NULL)
+ len = p1 - p;
+ else
+ len = strlen (p);
+ strncpy (tryname, p, len);
+ tryname[len] = '\0';
+ strcat (tryname, "/");
+ strcat (tryname, shell_file);
+ if (access (tryname, X_OK) < 0)
+ continue;
+ if (stat (tryname, &statbuf) < 0)
+ continue;
+ if (!S_ISREG (statbuf.st_mode))
+ /* We certainly need to reject directories. I'm not quite
+ as sure about FIFOs, sockets, etc., but I kind of doubt
+ that people want to exec() these things. */
+ continue;
+ break;
+ }
+ if (p == NULL)
+ /* Not found. This must be an error rather than merely passing
+ the file to execlp(), because execlp() would try all the
+ exec()s, causing GDB to get confused. */
+ error ("Can't find shell %s in PATH", shell_file);
-SYNOPSIS
+ shell_file = tryname;
+ }
- static int open_proc_file (pid)
+ fork_inferior (exec_file, allargs, env,
+ proc_set_exec_trap, procfs_init_inferior, shell_file);
-DESCRIPTION
+ /* We are at the first instruction we care about. */
+ /* Pedal to the metal... */
- Given a process id, close the existing open /proc entry (if any)
- and open one for the new process id. Once it is open, then
- mark the local process information structure as valid, which
- guarantees that the pid, fd, and pathname fields match an open
- /proc entry. Returns zero if the open fails, nonzero otherwise.
+ proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
+}
- Note that the pathname is left intact, even when the open fails,
- so that callers can use it to construct meaningful error messages
- rather than just "file open failed".
- */
+/* Clean up after the inferior dies. */
-static int
-DEFUN(open_proc_file, (pid),
- int pid)
+static void
+procfs_mourn_inferior ()
{
- pi.valid = 0;
- if (pi.valid)
+ struct procinfo *pi;
+ struct procinfo *next_pi;
+
+ for (pi = procinfo_list; pi; pi = next_pi)
{
- (void) close (pi.fd);
+ next_pi = pi->next;
+ unconditionally_kill_inferior (pi);
}
- if (pi.pathname == NULL)
+
+ unpush_target (&procfs_ops);
+ generic_mourn_inferior ();
+}
+
+
+/* Mark our target-struct as eligible for stray "run" and "attach" commands. */
+static int
+procfs_can_run ()
+{
+ /* This variable is controlled by modules that sit atop procfs that may layer
+ their own process structure atop that provided here. sol-thread.c does
+ this because of the Solaris two-level thread model. */
+
+ return !procfs_suppress_run;
+}
+#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
+\f
+/* Insert a watchpoint */
+int
+procfs_set_watchpoint(pid, addr, len, rw)
+ int pid;
+ CORE_ADDR addr;
+ int len;
+ int rw;
+{
+ struct procinfo *pi;
+ prwatch_t wpt;
+
+ pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
+ wpt.pr_vaddr = (caddr_t)addr;
+ wpt.pr_size = len;
+ wpt.pr_wflags = ((rw & 1) ? MA_READ : 0) | ((rw & 2) ? MA_WRITE : 0);
+ if (ioctl (pi->fd, PIOCSWATCH, &wpt) < 0)
{
- pi.pathname = xmalloc (32);
+ if (errno == E2BIG)
+ return -1;
+ /* Currently it sometimes happens that the same watchpoint gets
+ deleted twice - don't die in this case (FIXME please) */
+ if (errno == ESRCH && len == 0)
+ return 0;
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSWATCH failed");
}
- sprintf (pi.pathname, PROC_NAME_FMT, pid);
- if ((pi.fd = open (pi.pathname, O_RDWR)) >= 0)
+ return 0;
+}
+
+int
+procfs_stopped_by_watchpoint(pid)
+ int pid;
+{
+ struct procinfo *pi;
+ short what;
+ short why;
+
+ pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
+ if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
{
- pi.valid = 1;
- pi.pid = pid;
+ why = pi->prstatus.pr_why;
+ what = pi->prstatus.pr_what;
+ if (why == PR_FAULTED
+#if defined (FLTWATCH) && defined (FLTKWATCH)
+ && (what == FLTWATCH || what == FLTKWATCH)
+#else
+#ifdef FLTWATCH
+ && (what == FLTWATCH)
+#endif
+#ifdef FLTKWATCH
+ && (what == FLTKWATCH)
+#endif
+#endif
+ )
+ return what;
}
- return (pi.valid);
+ return 0;
+}
+#endif
+
+/* Why is this necessary? Shouldn't dead threads just be removed from the
+ thread database? */
+
+static int
+procfs_thread_alive (pid)
+ int pid;
+{
+ return 1;
+}
+
+/* Send a SIGINT to the process group. This acts just like the user typed a
+ ^C on the controlling terminal.
+
+ XXX - This may not be correct for all systems. Some may want to use
+ killpg() instead of kill (-pgrp). */
+
+static void
+procfs_stop ()
+{
+ extern pid_t inferior_process_group;
+
+ kill (-inferior_process_group, SIGINT);
+}
+\f
+/* Convert a pid to printable form. */
+
+#ifdef TIDGET
+char *
+procfs_pid_to_str (pid)
+ int pid;
+{
+ static char buf[100];
+
+ sprintf (buf, "Kernel thread %d", TIDGET (pid));
+
+ return buf;
}
+#endif /* TIDGET */
+\f
+struct target_ops procfs_ops = {
+ "procfs", /* to_shortname */
+ "Unix /proc child process", /* to_longname */
+ "Unix /proc child process (started by the \"run\" command).", /* to_doc */
+ procfs_open, /* to_open */
+ 0, /* to_close */
+ procfs_attach, /* to_attach */
+ procfs_detach, /* to_detach */
+ procfs_resume, /* to_resume */
+ procfs_wait, /* to_wait */
+ procfs_fetch_registers, /* to_fetch_registers */
+ procfs_store_registers, /* to_store_registers */
+ procfs_prepare_to_store, /* to_prepare_to_store */
+ procfs_xfer_memory, /* to_xfer_memory */
+ procfs_files_info, /* to_files_info */
+ memory_insert_breakpoint, /* to_insert_breakpoint */
+ memory_remove_breakpoint, /* to_remove_breakpoint */
+ terminal_init_inferior, /* to_terminal_init */
+ terminal_inferior, /* to_terminal_inferior */
+ terminal_ours_for_output, /* to_terminal_ours_for_output */
+ terminal_ours, /* to_terminal_ours */
+ child_terminal_info, /* to_terminal_info */
+ procfs_kill_inferior, /* to_kill */
+ 0, /* to_load */
+ 0, /* to_lookup_symbol */
+ procfs_create_inferior, /* to_create_inferior */
+ procfs_mourn_inferior, /* to_mourn_inferior */
+ procfs_can_run, /* to_can_run */
+ procfs_notice_signals, /* to_notice_signals */
+ procfs_thread_alive, /* to_thread_alive */
+ procfs_stop, /* to_stop */
+ process_stratum, /* to_stratum */
+ 0, /* to_next */
+ 1, /* to_has_all_memory */
+ 1, /* to_has_memory */
+ 1, /* to_has_stack */
+ 1, /* to_has_registers */
+ 1, /* to_has_execution */
+ 0, /* sections */
+ 0, /* sections_end */
+ OPS_MAGIC /* to_magic */
+};
+
+void
+_initialize_procfs ()
+{
+#ifdef HAVE_OPTIONAL_PROC_FS
+ char procname[32];
+ int fd;
+
+ /* If we have an optional /proc filesystem (e.g. under OSF/1),
+ don't add procfs support if we cannot access the running
+ GDB via /proc. */
+ sprintf (procname, PROC_NAME_FMT, getpid ());
+ if ((fd = open (procname, O_RDONLY)) < 0)
+ return;
+ close (fd);
+#endif
+
+ add_target (&procfs_ops);
-#endif /* USE_PROC_FS */
+ add_info ("proc", info_proc,
+"Show process status information using /proc entry.\n\
+Specify process id or use current inferior by default.\n\
+Specify keywords for detailed information; default is summary.\n\
+Keywords are: `all', `faults', `flags', `id', `mappings', `signals',\n\
+`status', `syscalls', and `times'.\n\
+Unambiguous abbreviations may be used.");
+
+ init_syscall_table ();
+}
projects / binutils.git / blobdiff