/* Low level Unix child interface to ptrace, for GDB when running under Unix.
- Copyright 1988, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
+ Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
+ 1998, 1999, 2000, 2001, 2002
+ Free Software Foundation, Inc.
-This file is part of GDB.
+ This file is part of GDB.
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-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. */
+ 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., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "target.h"
+#include "gdb_string.h"
+#include "regcache.h"
+
+#include "gdb_wait.h"
+
+#include "command.h"
#ifdef USG
#include <sys/types.h>
#endif
#include <sys/param.h>
-#include <sys/dir.h>
+#include "gdb_dirent.h"
#include <signal.h>
#include <sys/ioctl.h>
-#ifndef USG
-#ifdef PTRACE_IN_WRONG_PLACE
+
+#ifdef HAVE_PTRACE_H
#include <ptrace.h>
#else
+#ifdef HAVE_SYS_PTRACE_H
#include <sys/ptrace.h>
#endif
#endif
+#if !defined (PT_READ_I)
+#define PT_READ_I 1 /* Read word from text space */
+#endif
+#if !defined (PT_READ_D)
+#define PT_READ_D 2 /* Read word from data space */
+#endif
+#if !defined (PT_READ_U)
+#define PT_READ_U 3 /* Read word from kernel user struct */
+#endif
+#if !defined (PT_WRITE_I)
+#define PT_WRITE_I 4 /* Write word to text space */
+#endif
+#if !defined (PT_WRITE_D)
+#define PT_WRITE_D 5 /* Write word to data space */
+#endif
+#if !defined (PT_WRITE_U)
+#define PT_WRITE_U 6 /* Write word to kernel user struct */
+#endif
+#if !defined (PT_CONTINUE)
+#define PT_CONTINUE 7 /* Continue after signal */
+#endif
+#if !defined (PT_STEP)
+#define PT_STEP 9 /* Set flag for single stepping */
+#endif
#if !defined (PT_KILL)
-#define PT_KILL 8
-#define PT_STEP 9
-#define PT_CONTINUE 7
-#define PT_READ_U 3
-#define PT_WRITE_U 6
-#define PT_READ_I 1
-#define PT_READ_D 2
-#define PT_WRITE_I 4
-#define PT_WRITE_D 5
-#endif /* No PT_KILL. */
+#define PT_KILL 8 /* Send child a SIGKILL signal */
+#endif
#ifndef PT_ATTACH
#define PT_ATTACH PTRACE_ATTACH
#ifndef NO_SYS_FILE
#include <sys/file.h>
#endif
-#include <sys/stat.h>
+#if 0
+/* Don't think this is used anymore. On the sequent (not sure whether it's
+ dynix or ptx or both), it is included unconditionally by sys/user.h and
+ not protected against multiple inclusion. */
+#include "gdb_stat.h"
+#endif
#if !defined (FETCH_INFERIOR_REGISTERS)
#include <sys/user.h> /* Probably need to poke the user structure */
#endif /* KERNEL_U_ADDR_BSD. */
#endif /* !FETCH_INFERIOR_REGISTERS */
+#if !defined (CHILD_XFER_MEMORY)
+static void udot_info (char *, int);
+#endif
+
+#if !defined (FETCH_INFERIOR_REGISTERS)
+static void fetch_register (int);
+static void store_register (int);
+#endif
+
+void _initialize_kernel_u_addr (void);
+void _initialize_infptrace (void);
\f
+
/* This function simply calls ptrace with the given arguments.
It exists so that all calls to ptrace are isolated in this
machine-dependent file. */
int
-call_ptrace (request, pid, addr, data)
- int request, pid;
- PTRACE_ARG3_TYPE addr;
- int data;
+call_ptrace (int request, int pid, PTRACE_ARG3_TYPE addr, int data)
{
- return ptrace (request, pid, addr, data);
+ int pt_status = 0;
+
+#if 0
+ int saved_errno;
+
+ printf ("call_ptrace(request=%d, pid=%d, addr=0x%x, data=0x%x)",
+ request, pid, addr, data);
+#endif
+#if defined(PT_SETTRC)
+ /* If the parent can be told to attach to us, try to do it. */
+ if (request == PT_SETTRC)
+ {
+ errno = 0;
+#if !defined (FIVE_ARG_PTRACE)
+ pt_status = ptrace (PT_SETTRC, pid, addr, data);
+#else
+ /* Deal with HPUX 8.0 braindamage. We never use the
+ calls which require the fifth argument. */
+ pt_status = ptrace (PT_SETTRC, pid, addr, data, 0);
+#endif
+ if (errno)
+ perror_with_name ("ptrace");
+#if 0
+ printf (" = %d\n", pt_status);
+#endif
+ if (pt_status < 0)
+ return pt_status;
+ else
+ return parent_attach_all (pid, addr, data);
+ }
+#endif
+
+#if defined(PT_CONTIN1)
+ /* On HPUX, PT_CONTIN1 is a form of continue that preserves pending
+ signals. If it's available, use it. */
+ if (request == PT_CONTINUE)
+ request = PT_CONTIN1;
+#endif
+
+#if defined(PT_SINGLE1)
+ /* On HPUX, PT_SINGLE1 is a form of step that preserves pending
+ signals. If it's available, use it. */
+ if (request == PT_STEP)
+ request = PT_SINGLE1;
+#endif
+
+#if 0
+ saved_errno = errno;
+ errno = 0;
+#endif
+#if !defined (FIVE_ARG_PTRACE)
+ pt_status = ptrace (request, pid, addr, data);
+#else
+ /* Deal with HPUX 8.0 braindamage. We never use the
+ calls which require the fifth argument. */
+ pt_status = ptrace (request, pid, addr, data, 0);
+#endif
+
+#if 0
+ if (errno)
+ printf (" [errno = %d]", errno);
+
+ errno = saved_errno;
+ printf (" = 0x%x\n", pt_status);
+#endif
+ return pt_status;
}
-#ifdef DEBUG_PTRACE
+
+#if defined (DEBUG_PTRACE) || defined (FIVE_ARG_PTRACE)
/* For the rest of the file, use an extra level of indirection */
/* This lets us breakpoint usefully on call_ptrace. */
#define ptrace call_ptrace
#endif
-/* This is used when GDB is exiting. It gives less chance of error.*/
+/* Wait for a process to finish, possibly running a target-specific
+ hook before returning. */
-void
-kill_inferior_fast ()
+int
+ptrace_wait (ptid_t ptid, int *status)
{
- if (inferior_pid == 0)
- return;
- ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0);
- wait ((int *)0);
+ int wstate;
+
+ wstate = wait (status);
+ target_post_wait (pid_to_ptid (wstate), *status);
+ return wstate;
}
void
-kill_inferior ()
+kill_inferior (void)
{
- kill_inferior_fast ();
+ int status;
+ int pid = PIDGET (inferior_ptid);
+
+ if (pid == 0)
+ return;
+
+ /* This once used to call "kill" to kill the inferior just in case
+ the inferior was still running. As others have noted in the past
+ (kingdon) there shouldn't be any way to get here if the inferior
+ is still running -- else there's a major problem elsewere in gdb
+ and it needs to be fixed.
+
+ The kill call causes problems under hpux10, so it's been removed;
+ if this causes problems we'll deal with them as they arise. */
+ ptrace (PT_KILL, pid, (PTRACE_ARG3_TYPE) 0, 0);
+ ptrace_wait (null_ptid, &status);
target_mourn_inferior ();
}
+#ifndef CHILD_RESUME
+
/* Resume execution of the inferior process.
If STEP is nonzero, single-step it.
If SIGNAL is nonzero, give it that signal. */
void
-child_resume (step, signal)
- int step;
- int signal;
+child_resume (ptid_t ptid, int step, enum target_signal signal)
{
+ int pid = PIDGET (ptid);
+
errno = 0;
+ if (pid == -1)
+ /* Resume all threads. */
+ /* I think this only gets used in the non-threaded case, where "resume
+ all threads" and "resume inferior_ptid" are the same. */
+ pid = PIDGET (inferior_ptid);
+
/* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where
it was. (If GDB wanted it to start some other way, we have already
written a new PC value to the child.)
instructions), so we don't have to worry about that here. */
if (step)
- ptrace (PT_STEP, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
+ {
+ if (SOFTWARE_SINGLE_STEP_P ())
+ internal_error (__FILE__, __LINE__, "failed internal consistency check"); /* Make sure this doesn't happen. */
+ else
+ ptrace (PT_STEP, pid, (PTRACE_ARG3_TYPE) 1,
+ target_signal_to_host (signal));
+ }
else
- ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
+ ptrace (PT_CONTINUE, pid, (PTRACE_ARG3_TYPE) 1,
+ target_signal_to_host (signal));
if (errno)
- perror_with_name ("ptrace");
+ {
+ perror_with_name ("ptrace");
+ }
}
+#endif /* CHILD_RESUME */
\f
-#ifdef ATTACH_DETACH
-/* Nonzero if we are debugging an attached process rather than
- an inferior. */
-extern int attach_flag;
+#ifdef ATTACH_DETACH
/* Start debugging the process whose number is PID. */
int
-attach (pid)
- int pid;
+attach (int pid)
{
errno = 0;
ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0);
SIGNAL = 0 means just continue it. */
void
-detach (signal)
- int signal;
+detach (int signal)
{
errno = 0;
- ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
+ ptrace (PT_DETACH, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) 1,
+ signal);
if (errno)
perror_with_name ("ptrace");
attach_flag = 0;
}
#endif /* ATTACH_DETACH */
\f
-#if !defined (FETCH_INFERIOR_REGISTERS)
+/* Default the type of the ptrace transfer to int. */
+#ifndef PTRACE_XFER_TYPE
+#define PTRACE_XFER_TYPE int
+#endif
/* KERNEL_U_ADDR is the amount to subtract from u.u_ar0
to get the offset in the core file of the register values. */
-#if defined (KERNEL_U_ADDR_BSD)
+#if defined (KERNEL_U_ADDR_BSD) && !defined (FETCH_INFERIOR_REGISTERS)
/* Get kernel_u_addr using BSD-style nlist(). */
CORE_ADDR kernel_u_addr;
+#endif /* KERNEL_U_ADDR_BSD. */
void
-_initialize_kernel_u_addr ()
+_initialize_kernel_u_addr (void)
{
+#if defined (KERNEL_U_ADDR_BSD) && !defined (FETCH_INFERIOR_REGISTERS)
struct nlist names[2];
names[0].n_un.n_name = "_u";
if (nlist ("/vmunix", names) == 0)
kernel_u_addr = names[0].n_value;
else
- fatal ("Unable to get kernel u area address.");
-}
+ internal_error (__FILE__, __LINE__,
+ "Unable to get kernel u area address.");
#endif /* KERNEL_U_ADDR_BSD. */
-
-#if defined (KERNEL_U_ADDR_HPUX)
-/* Get kernel_u_addr using HPUX-style nlist(). */
-CORE_ADDR kernel_u_addr;
-
-struct hpnlist {
- char * n_name;
- long n_value;
- unsigned char n_type;
- unsigned char n_length;
- short n_almod;
- short n_unused;
-};
-static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }};
-
-/* read the value of the u area from the hp-ux kernel */
-void _initialize_kernel_u_addr ()
-{
- nlist ("/hp-ux", &nl);
- kernel_u_addr = nl[0].n_value;
}
-#endif /* KERNEL_U_ADDR_HPUX. */
+
+#if !defined (FETCH_INFERIOR_REGISTERS)
#if !defined (offsetof)
#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
/* U_REGS_OFFSET is the offset of the registers within the u area. */
#if !defined (U_REGS_OFFSET)
#define U_REGS_OFFSET \
- ptrace (PT_READ_U, inferior_pid, \
+ ptrace (PT_READ_U, PIDGET (inferior_ptid), \
(PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
- KERNEL_U_ADDR
#endif
-/* Registers we shouldn't try to fetch. */
-#if !defined (CANNOT_FETCH_REGISTER)
-#define CANNOT_FETCH_REGISTER(regno) 0
-#endif
-
/* Fetch one register. */
static void
-fetch_register (regno)
- int regno;
+fetch_register (int regno)
{
- register unsigned int regaddr;
- char buf[MAX_REGISTER_RAW_SIZE];
- char mess[128]; /* For messages */
+ /* This isn't really an address. But ptrace thinks of it as one. */
+ CORE_ADDR regaddr;
+ char mess[128]; /* For messages */
register int i;
-
- /* Offset of registers within the u area. */
- unsigned int offset;
+ unsigned int offset; /* Offset of registers within the u area. */
+ char *buf = alloca (MAX_REGISTER_RAW_SIZE);
+ int tid;
if (CANNOT_FETCH_REGISTER (regno))
{
- bzero (buf, REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
+ memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
supply_register (regno, buf);
return;
}
+ /* Overload thread id onto process id */
+ if ((tid = TIDGET (inferior_ptid)) == 0)
+ tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
+
offset = U_REGS_OFFSET;
regaddr = register_addr (regno, offset);
- for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
+ for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
{
errno = 0;
- *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid,
- (PTRACE_ARG3_TYPE) regaddr, 0);
- regaddr += sizeof (int);
+ *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid,
+ (PTRACE_ARG3_TYPE) regaddr, 0);
+ regaddr += sizeof (PTRACE_XFER_TYPE);
if (errno != 0)
{
- sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno);
+ sprintf (mess, "reading register %s (#%d)",
+ REGISTER_NAME (regno), regno);
perror_with_name (mess);
}
}
}
-/* Fetch all registers, or just one, from the child process. */
+/* Fetch register values from the inferior.
+ If REGNO is negative, do this for all registers.
+ Otherwise, REGNO specifies which register (so we can save time). */
void
-fetch_inferior_registers (regno)
- int regno;
+fetch_inferior_registers (int regno)
{
- if (regno == -1)
- for (regno = 0; regno < NUM_REGS; regno++)
+ if (regno >= 0)
+ {
fetch_register (regno);
+ }
else
- fetch_register (regno);
+ {
+ for (regno = 0; regno < NUM_REGS; regno++)
+ {
+ fetch_register (regno);
+ }
+ }
}
-/* Registers we shouldn't try to store. */
-#if !defined (CANNOT_STORE_REGISTER)
-#define CANNOT_STORE_REGISTER(regno) 0
-#endif
-
-/* Store our register values back into the inferior.
- If REGNO is -1, do this for all registers.
- Otherwise, REGNO specifies which register (so we can save time). */
+/* Store one register. */
-void
-store_inferior_registers (regno)
- int regno;
+static void
+store_register (int regno)
{
- register unsigned int regaddr;
- char buf[80];
- extern char registers[];
+ /* This isn't really an address. But ptrace thinks of it as one. */
+ CORE_ADDR regaddr;
+ char mess[128]; /* For messages */
register int i;
+ unsigned int offset; /* Offset of registers within the u area. */
+ int tid;
+ char *buf = alloca (MAX_REGISTER_RAW_SIZE);
- unsigned int offset = U_REGS_OFFSET;
+ if (CANNOT_STORE_REGISTER (regno))
+ {
+ return;
+ }
- if (regno >= 0)
+ /* Overload thread id onto process id */
+ if ((tid = TIDGET (inferior_ptid)) == 0)
+ tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
+
+ offset = U_REGS_OFFSET;
+
+ regaddr = register_addr (regno, offset);
+
+ /* Put the contents of regno into a local buffer */
+ regcache_collect (regno, buf);
+
+ /* Store the local buffer into the inferior a chunk at the time. */
+ for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
{
- regaddr = register_addr (regno, offset);
- for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
+ errno = 0;
+ ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr,
+ *(PTRACE_XFER_TYPE *) (buf + i));
+ regaddr += sizeof (PTRACE_XFER_TYPE);
+ if (errno != 0)
{
- errno = 0;
- ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
- *(int *) ®isters[REGISTER_BYTE (regno) + i]);
- if (errno != 0)
- {
- sprintf (buf, "writing register number %d(%d)", regno, i);
- perror_with_name (buf);
- }
- regaddr += sizeof(int);
+ sprintf (mess, "writing register %s (#%d)",
+ REGISTER_NAME (regno), regno);
+ perror_with_name (mess);
}
}
+}
+
+/* Store our register values back into the inferior.
+ If REGNO is negative, do this for all registers.
+ Otherwise, REGNO specifies which register (so we can save time). */
+
+void
+store_inferior_registers (int regno)
+{
+ if (regno >= 0)
+ {
+ store_register (regno);
+ }
else
{
for (regno = 0; regno < NUM_REGS; regno++)
{
- if (CANNOT_STORE_REGISTER (regno))
- continue;
- regaddr = register_addr (regno, offset);
- for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
- {
- errno = 0;
- ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
- *(int *) ®isters[REGISTER_BYTE (regno) + i]);
- if (errno != 0)
- {
- sprintf (buf, "writing register number %d(%d)", regno, i);
- perror_with_name (buf);
- }
- regaddr += sizeof(int);
- }
+ store_register (regno);
}
}
}
#endif /* !defined (FETCH_INFERIOR_REGISTERS). */
\f
+
+/* Set an upper limit on alloca. */
+#ifndef GDB_MAX_ALLOCA
+#define GDB_MAX_ALLOCA 0x1000
+#endif
+
+#if !defined (CHILD_XFER_MEMORY)
/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
- in the NEW_SUN_PTRACE case.
- It ought to be straightforward. But it appears that writing did
- not write the data that I specified. I cannot understand where
- it got the data that it actually did write. */
-
-/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
- to debugger memory starting at MYADDR. Copy to inferior if
- WRITE 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. */
+ in the NEW_SUN_PTRACE case. It ought to be straightforward. But
+ it appears that writing did not write the data that I specified. I
+ cannot understand where it got the data that it actually did write. */
+
+/* Copy LEN bytes to or from inferior's memory starting at MEMADDR to
+ debugger memory starting at MYADDR. Copy to inferior if WRITE is
+ nonzero. TARGET is ignored.
+
+ 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. */
int
-child_xfer_memory (memaddr, myaddr, len, write, target)
- CORE_ADDR memaddr;
- char *myaddr;
- int len;
- int write;
- struct target_ops *target; /* ignored */
+child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
+ struct mem_attrib *attrib, struct target_ops *target)
{
- register int i;
+ int i;
/* Round starting address down to longword boundary. */
- register CORE_ADDR addr = memaddr & - sizeof (int);
+ CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
/* Round ending address up; get number of longwords that makes. */
- register int count
- = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
+ int count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
+ / sizeof (PTRACE_XFER_TYPE));
+ int alloc = count * sizeof (PTRACE_XFER_TYPE);
+ PTRACE_XFER_TYPE *buffer;
+ struct cleanup *old_chain = NULL;
+
+#ifdef PT_IO
+ /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO request
+ that promises to be much more efficient in reading and writing
+ data in the traced process's address space. */
+
+ {
+ struct ptrace_io_desc piod;
+
+ /* NOTE: We assume that there are no distinct address spaces for
+ instruction and data. */
+ piod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D;
+ piod.piod_offs = (void *) memaddr;
+ piod.piod_addr = myaddr;
+ piod.piod_len = len;
+
+ if (ptrace (PT_IO, PIDGET (inferior_ptid), (caddr_t) &piod, 0) == -1)
+ {
+ /* If the PT_IO request is somehow not supported, fallback on
+ using PT_WRITE_D/PT_READ_D. Otherwise we will return zero
+ to indicate failure. */
+ if (errno != EINVAL)
+ return 0;
+ }
+ else
+ {
+ /* Return the actual number of bytes read or written. */
+ return piod.piod_len;
+ }
+ }
+#endif
+
/* Allocate buffer of that many longwords. */
- register int *buffer = (int *) alloca (count * sizeof (int));
+ if (len < GDB_MAX_ALLOCA)
+ {
+ buffer = (PTRACE_XFER_TYPE *) alloca (alloc);
+ }
+ else
+ {
+ buffer = (PTRACE_XFER_TYPE *) xmalloc (alloc);
+ old_chain = make_cleanup (xfree, buffer);
+ }
if (write)
{
- /* Fill start and end extra bytes of buffer with existing memory data. */
-
- if (addr != memaddr || len < (int)sizeof (int)) {
- /* Need part of initial word -- fetch it. */
- buffer[0] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
- 0);
- }
-
- if (count > 1) /* FIXME, avoid if even boundary */
+ /* Fill start and end extra bytes of buffer with existing memory
+ data. */
+ if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE))
{
- buffer[count - 1]
- = ptrace (PT_READ_I, inferior_pid,
- (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)),
- 0);
+ /* Need part of initial word -- fetch it. */
+ buffer[0] = ptrace (PT_READ_I, PIDGET (inferior_ptid),
+ (PTRACE_ARG3_TYPE) addr, 0);
}
- /* Copy data to be written over corresponding part of buffer */
+ if (count > 1) /* FIXME, avoid if even boundary. */
+ {
+ buffer[count - 1] =
+ ptrace (PT_READ_I, PIDGET (inferior_ptid),
+ ((PTRACE_ARG3_TYPE)
+ (addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))), 0);
+ }
- memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
+ /* Copy data to be written over corresponding part of buffer. */
+ memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
+ myaddr, len);
/* Write the entire buffer. */
-
- for (i = 0; i < count; i++, addr += sizeof (int))
+ for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
{
errno = 0;
- ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr,
- buffer[i]);
+ ptrace (PT_WRITE_D, PIDGET (inferior_ptid),
+ (PTRACE_ARG3_TYPE) addr, buffer[i]);
if (errno)
{
/* Using the appropriate one (I or D) is necessary for
- Gould NP1, at least. */
+ Gould NP1, at least. */
errno = 0;
- ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
- buffer[i]);
+ ptrace (PT_WRITE_I, PIDGET (inferior_ptid),
+ (PTRACE_ARG3_TYPE) addr, buffer[i]);
}
if (errno)
return 0;
}
+#ifdef CLEAR_INSN_CACHE
+ CLEAR_INSN_CACHE ();
+#endif
}
else
{
- /* Read all the longwords */
- for (i = 0; i < count; i++, addr += sizeof (int))
+ /* Read all the longwords. */
+ for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
{
errno = 0;
- buffer[i] = ptrace (PT_READ_I, inferior_pid,
+ buffer[i] = ptrace (PT_READ_I, PIDGET (inferior_ptid),
(PTRACE_ARG3_TYPE) addr, 0);
if (errno)
return 0;
}
/* Copy appropriate bytes out of the buffer. */
- memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
+ memcpy (myaddr,
+ (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
+ len);
}
+
+ if (old_chain != NULL)
+ do_cleanups (old_chain);
return len;
}
+\f
+
+static void
+udot_info (char *dummy1, int dummy2)
+{
+#if defined (KERNEL_U_SIZE)
+ int udot_off; /* Offset into user struct */
+ int udot_val; /* Value from user struct at udot_off */
+ char mess[128]; /* For messages */
+#endif
+
+ if (!target_has_execution)
+ {
+ error ("The program is not being run.");
+ }
+
+#if !defined (KERNEL_U_SIZE)
+
+ /* Adding support for this command is easy. Typically you just add a
+ routine, called "kernel_u_size" that returns the size of the user
+ struct, to the appropriate *-nat.c file and then add to the native
+ config file "#define KERNEL_U_SIZE kernel_u_size()" */
+ error ("Don't know how large ``struct user'' is in this version of gdb.");
+
+#else
+
+ for (udot_off = 0; udot_off < KERNEL_U_SIZE; udot_off += sizeof (udot_val))
+ {
+ if ((udot_off % 24) == 0)
+ {
+ if (udot_off > 0)
+ {
+ printf_filtered ("\n");
+ }
+ printf_filtered ("%04x:", udot_off);
+ }
+ udot_val = ptrace (PT_READ_U, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) udot_off, 0);
+ if (errno != 0)
+ {
+ sprintf (mess, "\nreading user struct at offset 0x%x", udot_off);
+ perror_with_name (mess);
+ }
+ /* Avoid using nonportable (?) "*" in print specs */
+ printf_filtered (sizeof (int) == 4 ? " 0x%08x" : " 0x%16x", udot_val);
+ }
+ printf_filtered ("\n");
+
+#endif
+}
+#endif /* !defined (CHILD_XFER_MEMORY). */
+\f
+
+void
+_initialize_infptrace (void)
+{
+#if !defined (CHILD_XFER_MEMORY)
+ add_info ("udot", udot_info,
+ "Print contents of kernel ``struct user'' for current child.");
+#endif
+}
projects / binutils.git / blobdiff