-/* Start and stop the inferior process, for GDB.
- Copyright (C) 1986, 1987, 1988 Free Software Foundation, Inc.
-
-GDB is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY. No author or distributor accepts responsibility to anyone
-for the consequences of using it or for whether it serves any
-particular purpose or works at all, unless he says so in writing.
-Refer to the GDB General Public License for full details.
-
-Everyone is granted permission to copy, modify and redistribute GDB,
-but only under the conditions described in the GDB General Public
-License. A copy of this license is supposed to have been given to you
-along with GDB so you can know your rights and responsibilities. It
-should be in a file named COPYING. Among other things, the copyright
-notice and this notice must be preserved on all copies.
-
-In other words, go ahead and share GDB, but don't try to stop
-anyone else from sharing it farther. Help stamp out software hoarding!
+/* Start (run) and stop the inferior process, for GDB.
+ Copyright (C) 1986, 1987, 1988, 1989, 1991 Free Software Foundation, Inc.
+
+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 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. */
+
+/* Notes on the algorithm used in wait_for_inferior to determine if we
+ just did a subroutine call when stepping. We have the following
+ information at that point:
+
+ Current and previous (just before this step) pc.
+ Current and previous sp.
+ Current and previous start of current function.
+
+ If the start's of the functions don't match, then
+
+ a) We did a subroutine call.
+
+ In this case, the pc will be at the beginning of a function.
+
+ b) We did a subroutine return.
+
+ Otherwise.
+
+ c) We did a longjmp.
+
+ If we did a longjump, we were doing "nexti", since a next would
+ have attempted to skip over the assembly language routine in which
+ the longjmp is coded and would have simply been the equivalent of a
+ continue. I consider this ok behaivior. We'd like one of two
+ things to happen if we are doing a nexti through the longjmp()
+ routine: 1) It behaves as a stepi, or 2) It acts like a continue as
+ above. Given that this is a special case, and that anybody who
+ thinks that the concept of sub calls is meaningful in the context
+ of a longjmp, I'll take either one. Let's see what happens.
+
+ Acts like a subroutine return. I can handle that with no problem
+ at all.
+
+ -->So: If the current and previous beginnings of the current
+ function don't match, *and* the pc is at the start of a function,
+ we've done a subroutine call. If the pc is not at the start of a
+ function, we *didn't* do a subroutine call.
+
+ -->If the beginnings of the current and previous function do match,
+ either:
+
+ a) We just did a recursive call.
+
+ In this case, we would be at the very beginning of a
+ function and 1) it will have a prologue (don't jump to
+ before prologue, or 2) (we assume here that it doesn't have
+ a prologue) there will have been a change in the stack
+ pointer over the last instruction. (Ie. it's got to put
+ the saved pc somewhere. The stack is the usual place. In
+ a recursive call a register is only an option if there's a
+ prologue to do something with it. This is even true on
+ register window machines; the prologue sets up the new
+ window. It might not be true on a register window machine
+ where the call instruction moved the register window
+ itself. Hmmm. One would hope that the stack pointer would
+ also change. If it doesn't, somebody send me a note, and
+ I'll work out a more general theory.
+ so) on all machines I'm aware of:
+
+ m68k: Call changes stack pointer. Regular jumps don't.
+
+ sparc: Recursive calls must have frames and therefor,
+ prologues.
+
+ vax: All calls have frames and hence change the
+ stack pointer.
+
+ b) We did a return from a recursive call. I don't see that we
+ have either the ability or the need to distinguish this
+ from an ordinary jump. The stack frame will be printed
+ when and if the frame pointer changes; if we are in a
+ function without a frame pointer, it's the users own
+ lookout.
+
+ c) We did a jump within a function. We assume that this is
+ true if we didn't do a recursive call.
+
+ d) We are in no-man's land ("I see no symbols here"). We
+ don't worry about this; it will make calls look like simple
+ jumps (and the stack frames will be printed when the frame
+ pointer moves), which is a reasonably non-violent response.
+
+#if 0
+ We skip this; it causes more problems than it's worth.
+#ifdef SUN4_COMPILER_FEATURE
+ We do a special ifdef for the sun 4, forcing it to single step
+ into calls which don't have prologues. This means that we can't
+ nexti over leaf nodes, we can probably next over them (since they
+ won't have debugging symbols, usually), and we can next out of
+ functions returning structures (with a "call .stret4" at the end).
+#endif
+#endif
*/
+
+
+
+
+#include <stdio.h>
+#include <string.h>
#include "defs.h"
-#include "initialize.h"
#include "param.h"
#include "symtab.h"
#include "frame.h"
#include "inferior.h"
+#include "breakpoint.h"
#include "wait.h"
+#include "gdbcore.h"
+#include "signame.h"
+#include "command.h"
+#include "terminal.h" /* For #ifdef TIOCGPGRP and new_tty */
+#include "target.h"
-#include <stdio.h>
#include <signal.h>
-#include <a.out.h>
-#ifdef UMAX_PTRACE
-#include <sys/param.h>
-#include <sys/ptrace.h>
-#endif UMAX_PTRACE
+/* unistd.h is needed to #define X_OK */
+#ifdef USG
+#include <unistd.h>
+#else
+#include <sys/file.h>
+#endif
+
+#ifdef SET_STACK_LIMIT_HUGE
+#include <sys/time.h>
+#include <sys/resource.h>
+
+extern int original_stack_limit;
+#endif /* SET_STACK_LIMIT_HUGE */
+
+extern char *getenv ();
+extern char **environ;
+
+extern struct target_ops child_ops; /* In inftarg.c */
+
-extern char *sys_siglist[];
-extern int errno;
+/* Sigtramp is a routine that the kernel calls (which then calls the
+ signal handler). On most machines it is a library routine that
+ is linked into the executable.
+
+ This macro, given a program counter value and the name of the
+ function in which that PC resides (which can be null if the
+ name is not known), returns nonzero if the PC and name show
+ that we are in sigtramp.
+
+ On most machines just see if the name is sigtramp (and if we have
+ no name, assume we are not in sigtramp). */
+#if !defined (IN_SIGTRAMP)
+#define IN_SIGTRAMP(pc, name) \
+ (name && !strcmp ("_sigtramp", name))
+#endif
+
+#ifdef TDESC
+#include "tdesc.h"
+int safe_to_init_tdesc_context = 0;
+extern dc_dcontext_t current_context;
+#endif
/* Tables of how to react to signals; the user sets them. */
static char signal_program[NSIG];
/* Nonzero if breakpoints are now inserted in the inferior. */
+/* Nonstatic for initialization during xxx_create_inferior. FIXME. */
-static int breakpoints_inserted;
+/*static*/ int breakpoints_inserted;
/* Function inferior was in as of last step command. */
static struct symbol *step_start_function;
-/* This is the sequence of bytes we insert for a breakpoint. */
-
-static char break_insn[] = BREAKPOINT;
-
-/* Nonzero => address for special breakpoint for resuming stepping. */
+/* Nonzero => address for special breakpoint for resuming stepping. */
static CORE_ADDR step_resume_break_address;
-/* Original contents of the byte where the special breakpoint is. */
+/* Pointer to orig contents of the byte where the special breakpoint is. */
-static char step_resume_break_shadow[sizeof break_insn];
+static char step_resume_break_shadow[BREAKPOINT_MAX];
/* Nonzero means the special breakpoint is a duplicate
so it has not itself been inserted. */
static int step_resume_break_duplicate;
-/* Nonzero if we are expecting a trace trap and should proceed from it.
- 2 means expecting 2 trace traps and should continue both times.
- That occurs when we tell sh to exec the program: we will get
- a trap after the exec of sh and a second when the program is exec'd. */
+/* Nonzero if we are expecting a trace trap and should proceed from it. */
static int trap_expected;
+/* Nonzero if the next time we try to continue the inferior, it will
+ step one instruction and generate a spurious trace trap.
+ This is used to compensate for a bug in HP-UX. */
+
+static int trap_expected_after_continue;
+
/* Nonzero means expecting a trace trap
and should stop the inferior and return silently when it happens. */
-static int stop_after_trap;
+int stop_after_trap;
-/* Nonzero means expecting a trace trap due to attaching to a process. */
+/* Nonzero means expecting a trap and caller will handle it themselves.
+ It is used after attach, due to attaching to a process;
+ when running in the shell before the child program has been exec'd;
+ and when running some kinds of remote stuff (FIXME?). */
-static int stop_after_attach;
+int stop_soon_quietly;
/* Nonzero if pc has been changed by the debugger
since the inferior stopped. */
int pc_changed;
-/* Nonzero if debugging a remote machine via a serial link or ethernet. */
+/* Nonzero if proceed is being used for a "finish" command or a similar
+ situation when stop_registers should be saved. */
-int remote_debugging;
+int proceed_to_finish;
-/* Save register contents here when about to pop a stack dummy frame. */
+/* Save register contents here when about to pop a stack dummy frame,
+ if-and-only-if proceed_to_finish is set.
+ Thus this contains the return value from the called function (assuming
+ values are returned in a register). */
char stop_registers[REGISTER_BYTES];
static int breakpoints_failed;
-/* Nonzero if inferior is in sh before our program got exec'd. */
-
-static int running_in_shell;
-
/* Nonzero after stop if current stack frame should be printed. */
static int stop_print_frame;
+#ifdef NO_SINGLE_STEP
+extern int one_stepped; /* From machine dependent code */
+extern void single_step (); /* Same. */
+#endif /* NO_SINGLE_STEP */
+
static void insert_step_breakpoint ();
static void remove_step_breakpoint ();
-static void wait_for_inferior ();
-static void normal_stop ();
+/*static*/ void wait_for_inferior ();
+void init_wait_for_inferior ();
+void normal_stop ();
+
+\f
+/* Things to clean up if we QUIT out of resume (). */
+/* ARGSUSED */
+static void
+resume_cleanups (arg)
+ int arg;
+{
+ normal_stop ();
+}
+
+/* Resume the inferior, but allow a QUIT. This is useful if the user
+ wants to interrupt some lengthy single-stepping operation
+ (for child processes, the SIGINT goes to the inferior, and so
+ we get a SIGINT random_signal, but for remote debugging and perhaps
+ other targets, that's not true).
+
+ STEP nonzero if we should step (zero to continue instead).
+ SIG is the signal to give the inferior (zero for none). */
+static void
+resume (step, sig)
+ int step;
+ int sig;
+{
+ struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0);
+ QUIT;
+
+#ifdef NO_SINGLE_STEP
+ if (step) {
+ single_step(); /* Do it the hard way, w/temp breakpoints */
+ step = 0; /* ...and don't ask hardware to do it. */
+ }
+#endif
+
+ /* Handle any optimized stores to the inferior NOW... */
+#ifdef DO_DEFERRED_STORES
+ DO_DEFERRED_STORES;
+#endif
+
+ target_resume (step, sig);
+ discard_cleanups (old_cleanups);
+}
-START_FILE
\f
/* Clear out all variables saying what to do when inferior is continued.
First do this, then set the ones you want, then call `proceed'. */
trap_expected = 0;
step_range_start = 0;
step_range_end = 0;
- step_frame = 0;
+ step_frame_address = 0;
step_over_calls = -1;
step_resume_break_address = 0;
stop_after_trap = 0;
- stop_after_attach = 0;
+ stop_soon_quietly = 0;
+ proceed_to_finish = 0;
+ breakpoint_proceeded = 1; /* We're about to proceed... */
- /* Discard any remaining commands left by breakpoint we had stopped at. */
- clear_breakpoint_commands ();
+ /* Discard any remaining commands or status from previous stop. */
+ bpstat_clear (&stop_bpstat);
}
/* Basic routine for continuing the program in various fashions.
ADDR is the address to resume at, or -1 for resume where stopped.
- SIGNAL is the signal to give it, or 0 for none,
+ SIGGNAL is the signal to give it, or 0 for none,
or -1 for act according to how it stopped.
STEP is nonzero if should trap after one instruction.
-1 means return after that and print nothing.
You should call clear_proceed_status before calling proceed. */
void
-proceed (addr, signal, step)
+proceed (addr, siggnal, step)
CORE_ADDR addr;
- int signal;
+ int siggnal;
int step;
{
int oneproc = 0;
if (step < 0)
stop_after_trap = 1;
- if (addr == -1)
+ if (addr == (CORE_ADDR)-1)
{
/* If there is a breakpoint at the address we will resume at,
step one instruction before inserting breakpoints
so that we do not stop right away. */
if (!pc_changed && breakpoint_here_p (read_pc ()))
- {
- oneproc = 1;
- /* We will get a trace trap after one instruction.
- Continue it automatically and insert breakpoints then. */
- trap_expected = 1;
- }
+ oneproc = 1;
}
else
- write_register (PC_REGNUM, addr);
+ {
+ write_register (PC_REGNUM, addr);
+#ifdef NPC_REGNUM
+ write_register (NPC_REGNUM, addr + 4);
+#ifdef NNPC_REGNUM
+ write_register (NNPC_REGNUM, addr + 8);
+#endif
+#endif
+ }
+
+ if (trap_expected_after_continue)
+ {
+ /* If (step == 0), a trap will be automatically generated after
+ the first instruction is executed. Force step one
+ instruction to clear this condition. This should not occur
+ if step is nonzero, but it is harmless in that case. */
+ oneproc = 1;
+ trap_expected_after_continue = 0;
+ }
- if (!oneproc)
+ if (oneproc)
+ /* We will get a trace trap after one instruction.
+ Continue it automatically and insert breakpoints then. */
+ trap_expected = 1;
+ else
{
int temp = insert_breakpoints ();
if (temp)
}
/* Install inferior's terminal modes. */
- terminal_inferior ();
+ target_terminal_inferior ();
- if (signal >= 0)
- stop_signal = signal;
+ if (siggnal >= 0)
+ stop_signal = siggnal;
/* If this signal should not be seen by program,
give it zero. Used for debugging signals. */
else if (stop_signal < NSIG && !signal_program[stop_signal])
stop_signal= 0;
/* Resume inferior. */
- resume (oneproc || step, stop_signal);
+ resume (oneproc || step || bpstat_should_step (), stop_signal);
/* Wait for it to stop (if not standalone)
and in any case decode why it stopped, and act accordingly. */
normal_stop ();
}
+#if 0
+/* This might be useful (not sure), but isn't currently used. See also
+ write_pc(). */
/* Writing the inferior pc as a register calls this function
to inform infrun that the pc has been set in the debugger. */
+void
writing_pc (val)
CORE_ADDR val;
{
stop_pc = val;
pc_changed = 1;
}
+#endif
-/* Start an inferior process for the first time.
- Actually it was started by the fork that created it,
- but it will have stopped one instruction after execing sh.
- Here we must get it up to actual execution of the real program. */
+/* Record the pc and sp of the program the last time it stopped.
+ These are just used internally by wait_for_inferior, but need
+ to be preserved over calls to it and cleared when the inferior
+ is started. */
+static CORE_ADDR prev_pc;
+static CORE_ADDR prev_sp;
+static CORE_ADDR prev_func_start;
+static char *prev_func_name;
-start_inferior ()
+\f
+/* Start an inferior Unix child process and sets inferior_pid to its pid.
+ EXEC_FILE is the file to run.
+ ALLARGS is a string containing the arguments to the program.
+ ENV is the environment vector to pass. Errors reported with error(). */
+
+#ifndef SHELL_FILE
+#define SHELL_FILE "/bin/sh"
+#endif
+
+void
+child_create_inferior (exec_file, allargs, env)
+ char *exec_file;
+ char *allargs;
+ char **env;
{
+ int pid;
+ char *shell_command;
+ extern int sys_nerr;
+ extern char *sys_errlist[];
+ char *shell_file;
+ static char default_shell_file[] = SHELL_FILE;
+ int len;
+ int pending_execs;
+ /* Set debug_fork then attach to the child while it sleeps, to debug. */
+ static int debug_fork = 0;
+ /* This is set to the result of setpgrp, which if vforked, will be visible
+ to you in the parent process. It's only used by humans for debugging. */
+ static int debug_setpgrp = 657473;
+ char **save_our_env;
+
+ /* The user might want tilde-expansion, and in general probably wants
+ the program to behave the same way as if run from
+ his/her favorite shell. So we let the shell run it for us.
+ FIXME, this should probably search the local environment (as
+ modified by the setenv command), not the env gdb inherited. */
+ shell_file = getenv ("SHELL");
+ if (shell_file == NULL)
+ shell_file = default_shell_file;
+
+ len = 5 + strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop*/ 10;
+ /* If desired, concat something onto the front of ALLARGS.
+ SHELL_COMMAND is the result. */
+#ifdef SHELL_COMMAND_CONCAT
+ shell_command = (char *) alloca (strlen (SHELL_COMMAND_CONCAT) + len);
+ strcpy (shell_command, SHELL_COMMAND_CONCAT);
+#else
+ shell_command = (char *) alloca (len);
+ shell_command[0] = '\0';
+#endif
+ strcat (shell_command, "exec ");
+ strcat (shell_command, exec_file);
+ strcat (shell_command, " ");
+ strcat (shell_command, allargs);
+
+ /* exec is said to fail if the executable is open. */
+ close_exec_file ();
+
+ /* Retain a copy of our environment variables, since the child will
+ replace the value of environ and if we're vforked, we have to
+ restore it. */
+ save_our_env = environ;
+
+ /* Tell the terminal handling subsystem what tty we plan to run on;
+ it will just record the information for later. */
+
+ new_tty_prefork (inferior_io_terminal);
+
+ /* It is generally good practice to flush any possible pending stdio
+ output prior to doing a fork, to avoid the possibility of both the
+ parent and child flushing the same data after the fork. */
+
+ fflush (stdout);
+ fflush (stderr);
+
+#if defined(USG) && !defined(HAVE_VFORK)
+ pid = fork ();
+#else
+ if (debug_fork)
+ pid = fork ();
+ else
+ pid = vfork ();
+#endif
+
+ if (pid < 0)
+ perror_with_name ("vfork");
+
+ if (pid == 0)
+ {
+ if (debug_fork)
+ sleep (debug_fork);
+
+#ifdef TIOCGPGRP
+ /* Run inferior in a separate process group. */
+#ifdef USG
+ debug_setpgrp = setpgrp ();
+#else
+ debug_setpgrp = setpgrp (getpid (), getpid ());
+#endif
+ if (debug_setpgrp == -1)
+ perror("setpgrp failed in child");
+#endif /* TIOCGPGRP */
+
+#ifdef SET_STACK_LIMIT_HUGE
+ /* Reset the stack limit back to what it was. */
+ {
+ struct rlimit rlim;
+
+ getrlimit (RLIMIT_STACK, &rlim);
+ rlim.rlim_cur = original_stack_limit;
+ setrlimit (RLIMIT_STACK, &rlim);
+ }
+#endif /* SET_STACK_LIMIT_HUGE */
+
+ /* Ask the tty subsystem to switch to the one we specified earlier
+ (or to share the current terminal, if none was specified). */
+
+ new_tty ();
+
+ /* Changing the signal handlers for the inferior after
+ a vfork can also change them for the superior, so we don't mess
+ with signals here. See comments in
+ initialize_signals for how we get the right signal handlers
+ for the inferior. */
+
+#ifdef USE_PROC_FS
+ proc_set_exec_trap (); /* Use SVR4 /proc interface */
+#else
+ call_ptrace (0, 0, 0, 0); /* "Trace me, Dr. Memory!" */
+#endif
+
+ /* There is no execlpe call, so we have to set the environment
+ for our child in the global variable. If we've vforked, this
+ clobbers the parent, but environ is restored a few lines down
+ in the parent. By the way, yes we do need to look down the
+ path to find $SHELL. Rich Pixley says so, and I agree. */
+ environ = env;
+ execlp (shell_file, shell_file, "-c", shell_command, (char *)0);
+
+ fprintf (stderr, "Cannot exec %s: %s.\n", shell_file,
+ errno < sys_nerr ? sys_errlist[errno] : "unknown error");
+ fflush (stderr);
+ _exit (0177);
+ }
+
+ /* Restore our environment in case a vforked child clob'd it. */
+ environ = save_our_env;
+
+ /* Now that we have a child process, make it our target. */
+ push_target (&child_ops);
+
+#ifdef CREATE_INFERIOR_HOOK
+ CREATE_INFERIOR_HOOK (pid);
+#endif
+
+/* The process was started by the fork that created it,
+ but it will have stopped one instruction after execing the shell.
+ Here we must get it up to actual execution of the real program. */
+
+ inferior_pid = pid; /* Needed for wait_for_inferior stuff below */
+
+ clear_proceed_status ();
+
+#if defined (START_INFERIOR_HOOK)
+ START_INFERIOR_HOOK ();
+#endif
+
/* We will get a trace trap after one instruction.
Continue it automatically. Eventually (after shell does an exec)
it will get another trace trap. Then insert breakpoints and continue. */
- trap_expected = 2;
- running_in_shell = 0; /* Set to 1 at first SIGTRAP, 0 at second. */
- breakpoints_inserted = 0;
- mark_breakpoints_out ();
+
+#ifdef START_INFERIOR_TRAPS_EXPECTED
+ pending_execs = START_INFERIOR_TRAPS_EXPECTED;
+#else
+ pending_execs = 2;
+#endif
+
+ init_wait_for_inferior ();
/* Set up the "saved terminal modes" of the inferior
based on what modes we are starting it with. */
- terminal_init_inferior ();
+ target_terminal_init ();
/* Install inferior's terminal modes. */
- terminal_inferior ();
+ target_terminal_inferior ();
- if (remote_debugging)
+ while (1)
{
- trap_expected = 0;
- fetch_inferior_registers();
- set_current_frame (read_register(FP_REGNUM));
- stop_frame = get_current_frame();
- inferior_pid = 3;
- if (insert_breakpoints())
- fatal("Can't insert breakpoints");
- breakpoints_inserted = 1;
- proceed(-1, -1, 0);
+ stop_soon_quietly = 1; /* Make wait_for_inferior be quiet */
+ wait_for_inferior ();
+ if (stop_signal != SIGTRAP)
+ {
+ /* Let shell child handle its own signals in its own way */
+ /* FIXME, what if child has exit()ed? Must exit loop somehow */
+ resume (0, stop_signal);
+ }
+ else
+ {
+ /* We handle SIGTRAP, however; it means child did an exec. */
+ if (0 == --pending_execs)
+ break;
+ resume (0, 0); /* Just make it go on */
+ }
}
- else
+ stop_soon_quietly = 0;
+
+ /* We are now in the child process of interest, having exec'd the
+ correct program, and are poised at the first instruction of the
+ new program. */
+#ifdef SOLIB_CREATE_INFERIOR_HOOK
+ SOLIB_CREATE_INFERIOR_HOOK ();
+#endif
+
+ /* Should this perhaps just be a "proceed" call? FIXME */
+ insert_step_breakpoint ();
+ breakpoints_failed = insert_breakpoints ();
+ if (!breakpoints_failed)
{
+ breakpoints_inserted = 1;
+ target_terminal_inferior();
+ /* Start the child program going on its first instruction, single-
+ stepping if we need to. */
+ resume (bpstat_should_step (), 0);
wait_for_inferior ();
normal_stop ();
}
void
start_remote ()
{
+ init_wait_for_inferior ();
clear_proceed_status ();
- running_in_shell = 0;
+ stop_soon_quietly = 1;
trap_expected = 0;
- inferior_pid = 3;
+ wait_for_inferior ();
+ normal_stop ();
+}
+
+/* Initialize static vars when a new inferior begins. */
+
+void
+init_wait_for_inferior ()
+{
+ /* These are meaningless until the first time through wait_for_inferior. */
+ prev_pc = 0;
+ prev_sp = 0;
+ prev_func_start = 0;
+ prev_func_name = NULL;
+
+ trap_expected_after_continue = 0;
breakpoints_inserted = 0;
mark_breakpoints_out ();
- wait_for_inferior ();
- normal_stop();
+ stop_signal = 0; /* Don't confuse first call to proceed(). */
}
-#ifdef ATTACH_DETACH
/* Attach to process PID, then initialize for debugging it
and wait for the trace-trap that results from attaching. */
void
-attach_program (pid)
- int pid;
+child_attach (args, from_tty)
+ char *args;
+ int from_tty;
{
+ char *exec_file;
+ int pid;
+
+ dont_repeat();
+
+ if (!args)
+ error_no_arg ("process-id to attach");
+
+#ifndef ATTACH_DETACH
+ error ("Can't attach to a process on this machine.");
+#else
+ pid = atoi (args);
+
+ if (target_has_execution)
+ {
+ if (query ("A program is being debugged already. Kill it? "))
+ target_kill ((char *)0, from_tty);
+ else
+ error ("Inferior not killed.");
+ }
+
+ exec_file = (char *) get_exec_file (1);
+
+ if (from_tty)
+ {
+ printf ("Attaching program: %s pid %d\n",
+ exec_file, pid);
+ fflush (stdout);
+ }
+
attach (pid);
inferior_pid = pid;
+ push_target (&child_ops);
mark_breakpoints_out ();
- terminal_init_inferior ();
+ target_terminal_init ();
clear_proceed_status ();
- stop_after_attach = 1;
+ stop_soon_quietly = 1;
/*proceed (-1, 0, -2);*/
+ target_terminal_inferior ();
wait_for_inferior ();
+#ifdef SOLIB_ADD
+ SOLIB_ADD ((char *)0, from_tty, (struct target_ops *)0);
+#endif
normal_stop ();
+#endif /* ATTACH_DETACH */
}
-#endif /* ATTACH_DETACH */
\f
/* Wait for control to return from inferior to debugger.
If inferior gets a signal, we may decide to start it up again
When this function actually returns it means the inferior
should be left stopped and GDB should read more commands. */
-static void
+void
wait_for_inferior ()
{
- register int pid;
WAITTYPE w;
- CORE_ADDR pc;
- int tem;
int another_trap;
int random_signal;
CORE_ADDR stop_sp;
+ CORE_ADDR stop_func_start;
+ char *stop_func_name;
+ CORE_ADDR prologue_pc;
int stop_step_resume_break;
- int newmisc;
- int newfun_pc;
- struct symbol *newfun;
struct symtab_and_line sal;
- int prev_pc;
+ int remove_breakpoints_on_following_step = 0;
+#ifdef TDESC
+ extern dc_handle_t tdesc_handle;
+#endif
+ int current_line;
+
+#if 0
+ /* This no longer works now that read_register is lazy;
+ it might try to ptrace when the process is not stopped. */
+ prev_pc = read_pc ();
+ (void) find_pc_partial_function (prev_pc, &prev_func_name,
+ &prev_func_start);
+ prev_func_start += FUNCTION_START_OFFSET;
+ prev_sp = read_register (SP_REGNUM);
+#endif /* 0 */
+
+ sal = find_pc_line(prev_pc, 0);
+ current_line = sal.line;
while (1)
{
- prev_pc = read_pc ();
-
- if (remote_debugging)
- remote_wait (&w);
- else
- {
- pid = wait (&w);
- if (pid != inferior_pid)
- continue;
- }
-
+ /* Clean up saved state that will become invalid. */
pc_changed = 0;
- fetch_inferior_registers ();
- stop_pc = read_pc ();
- set_current_frame (read_register (FP_REGNUM));
- stop_frame = get_current_frame ();
- stop_sp = read_register (SP_REGNUM);
- another_trap = 0;
- stop_breakpoint = 0;
- stop_step = 0;
- stop_stack_dummy = 0;
- stop_print_frame = 1;
- stop_step_resume_break = 0;
- random_signal = 0;
- breakpoints_failed = 0;
+ flush_cached_frames ();
+ registers_changed ();
- /* Look at the cause of the stop, and decide what to do.
- The alternatives are:
- 1) break; to really stop and return to the debugger,
- 2) drop through to start up again
- (set another_trap to 1 to single step once)
- 3) set random_signal to 1, and the decision between 1 and 2
- will be made according to the signal handling tables. */
+ target_wait (&w);
+ /* See if the process still exists; clean up if it doesn't. */
if (WIFEXITED (w))
{
- terminal_ours_for_output ();
- if (WRETCODE (w))
- printf ("\nProgram exited with code 0%o.\n", WRETCODE (w));
+ target_terminal_ours (); /* Must do this before mourn anyway */
+#ifdef TDESC
+ safe_to_init_tdesc_context = 0;
+#endif
+ if (WEXITSTATUS (w))
+ printf ("\nProgram exited with code 0%o.\n",
+ (unsigned int)WEXITSTATUS (w));
else
- printf ("\nProgram exited normally.\n");
+ if (!batch_mode())
+ printf ("\nProgram exited normally.\n");
fflush (stdout);
- inferior_died ();
+ target_mourn_inferior ();
+#ifdef NO_SINGLE_STEP
+ one_stepped = 0;
+#endif
stop_print_frame = 0;
break;
}
else if (!WIFSTOPPED (w))
{
- kill_inferior ();
stop_print_frame = 0;
stop_signal = WTERMSIG (w);
- terminal_ours_for_output ();
+ target_terminal_ours (); /* Must do this before mourn anyway */
+ target_kill ((char *)0, 0); /* kill mourns as well */
+#ifdef TDESC
+ safe_to_init_tdesc_context = 0;
+#endif
+#ifdef PRINT_RANDOM_SIGNAL
+ printf ("\nProgram terminated: ");
+ PRINT_RANDOM_SIGNAL (stop_signal);
+#else
printf ("\nProgram terminated with signal %d, %s\n",
stop_signal,
stop_signal < NSIG
? sys_siglist[stop_signal]
: "(undocumented)");
+#endif
printf ("The inferior process no longer exists.\n");
fflush (stdout);
+#ifdef NO_SINGLE_STEP
+ one_stepped = 0;
+#endif
break;
}
+
+#ifdef NO_SINGLE_STEP
+ if (one_stepped)
+ single_step (0); /* This actually cleans up the ss */
+#endif /* NO_SINGLE_STEP */
+
+ stop_pc = read_pc ();
+#ifdef TDESC
+ if (safe_to_init_tdesc_context)
+ {
+ current_context = init_dcontext();
+ set_current_frame ( create_new_frame (get_frame_base (read_pc()),read_pc()));
+ }
else
+#endif /* TDESC */
+ set_current_frame ( create_new_frame (read_register (FP_REGNUM),
+ read_pc ()));
+
+ stop_frame_address = FRAME_FP (get_current_frame ());
+ stop_sp = read_register (SP_REGNUM);
+ stop_func_start = 0;
+ stop_func_name = 0;
+ /* Don't care about return value; stop_func_start and stop_func_name
+ will both be 0 if it doesn't work. */
+ (void) find_pc_partial_function (stop_pc, &stop_func_name,
+ &stop_func_start);
+ stop_func_start += FUNCTION_START_OFFSET;
+ another_trap = 0;
+ bpstat_clear (&stop_bpstat);
+ stop_step = 0;
+ stop_stack_dummy = 0;
+ stop_print_frame = 1;
+ stop_step_resume_break = 0;
+ random_signal = 0;
+ stopped_by_random_signal = 0;
+ breakpoints_failed = 0;
+
+ /* Look at the cause of the stop, and decide what to do.
+ The alternatives are:
+ 1) break; to really stop and return to the debugger,
+ 2) drop through to start up again
+ (set another_trap to 1 to single step once)
+ 3) set random_signal to 1, and the decision between 1 and 2
+ will be made according to the signal handling tables. */
+
+ stop_signal = WSTOPSIG (w);
+
+ /* First, distinguish signals caused by the debugger from signals
+ that have to do with the program's own actions.
+ Note that breakpoint insns may cause SIGTRAP or SIGILL
+ or SIGEMT, depending on the operating system version.
+ Here we detect when a SIGILL or SIGEMT is really a breakpoint
+ and change it to SIGTRAP. */
+
+ if (stop_signal == SIGTRAP
+ || (breakpoints_inserted &&
+ (stop_signal == SIGILL
+ || stop_signal == SIGEMT))
+ || stop_soon_quietly)
{
- stop_signal = WSTOPSIG (w);
-
- /* First, distinguish signals caused by the debugger from signals
- that have to do with the program's own actions.
- Note that breakpoint insns may cause SIGTRAP or SIGILL
- or SIGEMT, depending on the operating system version.
- Here we detect when a SIGILL or SIGEMT is really a breakpoint
- and change it to SIGTRAP. */
-
- if (stop_signal == SIGTRAP
- || (breakpoints_inserted &&
- (stop_signal == SIGILL
- || stop_signal == SIGEMT))
- || stop_after_attach)
+ if (stop_signal == SIGTRAP && stop_after_trap)
{
- if (stop_signal == SIGTRAP && stop_after_trap)
- {
- stop_print_frame = 0;
- break;
- }
- if (stop_after_attach)
- break;
- /* Don't even think about breakpoints
- if still running the shell that will exec the program
- or if just proceeded over a breakpoint. */
- if (stop_signal == SIGTRAP && trap_expected)
- stop_breakpoint = 0;
- else
- /* See if there is a breakpoint at the current PC. */
+ stop_print_frame = 0;
+ break;
+ }
+ if (stop_soon_quietly)
+ break;
+
+ /* Don't even think about breakpoints
+ if just proceeded over a breakpoint.
+
+ However, if we are trying to proceed over a breakpoint
+ and end up in sigtramp, then step_resume_break_address
+ will be set and we should check whether we've hit the
+ step breakpoint. */
+ if (stop_signal == SIGTRAP && trap_expected
+ && step_resume_break_address == NULL)
+ bpstat_clear (&stop_bpstat);
+ else
+ {
+ /* See if there is a breakpoint at the current PC. */
#if DECR_PC_AFTER_BREAK
- /* Notice the case of stepping through a jump
- that leads just after a breakpoint.
- Don't confuse that with hitting the breakpoint.
- What we check for is that 1) stepping is going on
- and 2) the pc before the last insn does not match
- the address of the breakpoint before the current pc. */
- if (!(prev_pc != stop_pc - DECR_PC_AFTER_BREAK
- && step_range_end && !step_resume_break_address))
+ /* Notice the case of stepping through a jump
+ that leads just after a breakpoint.
+ Don't confuse that with hitting the breakpoint.
+ What we check for is that 1) stepping is going on
+ and 2) the pc before the last insn does not match
+ the address of the breakpoint before the current pc. */
+ if (!(prev_pc != stop_pc - DECR_PC_AFTER_BREAK
+ && step_range_end && !step_resume_break_address))
#endif /* DECR_PC_AFTER_BREAK not zero */
- {
- select_frame (stop_frame, 0); /* For condition exprs. */
- stop_breakpoint = breakpoint_stop_status (stop_pc, stop_frame);
- /* Following in case break condition called a function. */
- stop_print_frame = 1;
- if (stop_breakpoint && DECR_PC_AFTER_BREAK)
- {
- stop_pc -= DECR_PC_AFTER_BREAK;
- write_register (PC_REGNUM, stop_pc);
- pc_changed = 0;
- }
- }
- /* See if we stopped at the special breakpoint for
- stepping over a subroutine call. */
- if (stop_pc - DECR_PC_AFTER_BREAK == step_resume_break_address)
{
- stop_step_resume_break = 1;
- if (DECR_PC_AFTER_BREAK)
+ /* See if we stopped at the special breakpoint for
+ stepping over a subroutine call. If both are zero,
+ this wasn't the reason for the stop. */
+ if (stop_pc - DECR_PC_AFTER_BREAK
+ == step_resume_break_address
+ && step_resume_break_address)
{
- stop_pc -= DECR_PC_AFTER_BREAK;
- write_register (PC_REGNUM, stop_pc);
- pc_changed = 0;
+ stop_step_resume_break = 1;
+ if (DECR_PC_AFTER_BREAK)
+ {
+ stop_pc -= DECR_PC_AFTER_BREAK;
+ write_register (PC_REGNUM, stop_pc);
+ pc_changed = 0;
+ }
+ }
+ else
+ {
+ stop_bpstat =
+ bpstat_stop_status (&stop_pc, stop_frame_address);
+ /* Following in case break condition called a
+ function. */
+ stop_print_frame = 1;
}
- }
-
- if (stop_signal == SIGTRAP)
- random_signal
- = !(stop_breakpoint || trap_expected
- || stop_step_resume_break
- || (stop_sp INNER_THAN stop_pc && stop_pc INNER_THAN stop_frame)
- || (step_range_end && !step_resume_break_address));
- else
- {
- random_signal
- = !(stop_breakpoint || stop_step_resume_break);
- if (!random_signal)
- stop_signal = SIGTRAP;
}
}
+
+ if (stop_signal == SIGTRAP)
+ random_signal
+ = !(bpstat_explains_signal (stop_bpstat)
+ || trap_expected
+ || stop_step_resume_break
+ || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)
+ || (step_range_end && !step_resume_break_address));
else
- random_signal = 1;
-
- /* For the program's own signals, act according to
- the signal handling tables. */
-
- if (random_signal
- && !(running_in_shell && stop_signal == SIGSEGV))
{
- /* Signal not for debugging purposes. */
- int printed = 0;
-
- if (stop_signal >= NSIG
- || signal_print[stop_signal])
- {
- printed = 1;
- terminal_ours_for_output ();
- printf ("\nProgram received signal %d, %s\n",
- stop_signal,
- stop_signal < NSIG
- ? sys_siglist[stop_signal]
- : "(undocumented)");
- fflush (stdout);
- }
- if (stop_signal >= NSIG
- || signal_stop[stop_signal])
- break;
- /* If not going to stop, give terminal back
- if we took it away. */
- else if (printed)
- terminal_inferior ();
+ random_signal
+ = !(bpstat_explains_signal (stop_bpstat)
+ || stop_step_resume_break
+ /* End of a stack dummy. Some systems (e.g. Sony
+ news) give another signal besides SIGTRAP,
+ so check here as well as above. */
+ || (stop_sp INNER_THAN stop_pc
+ && stop_pc INNER_THAN stop_frame_address)
+ );
+ if (!random_signal)
+ stop_signal = SIGTRAP;
}
-
- /* Handle cases caused by hitting a breakpoint. */
-
- if (!random_signal
- && (stop_breakpoint || stop_step_resume_break))
+ }
+ else
+ random_signal = 1;
+
+ /* For the program's own signals, act according to
+ the signal handling tables. */
+
+ if (random_signal)
+ {
+ /* Signal not for debugging purposes. */
+ int printed = 0;
+
+ stopped_by_random_signal = 1;
+
+ if (stop_signal >= NSIG
+ || signal_print[stop_signal])
{
- /* Does a breakpoint want us to stop? */
- if (stop_breakpoint && stop_breakpoint != -1)
- {
- /* 0x1000000 is set in stop_breakpoint as returned by
- breakpoint_status_p to indicate a silent breakpoint. */
- if (stop_breakpoint > 0 && stop_breakpoint & 0x1000000)
- {
- stop_breakpoint &= ~0x1000000;
- stop_print_frame = 0;
- }
- break;
- }
- /* But if we have hit the step-resumption breakpoint,
- remove it. It has done its job getting us here. */
- if (stop_step_resume_break
- && (step_frame == 0 || stop_frame == step_frame))
- {
- remove_step_breakpoint ();
- step_resume_break_address = 0;
- }
- /* Otherwise, must remove breakpoints and single-step
- to get us past the one we hit. */
- else
- {
- remove_breakpoints ();
- remove_step_breakpoint ();
- breakpoints_inserted = 0;
- another_trap = 1;
- }
-
- /* We come here if we hit a breakpoint but should not
- stop for it. Possibly we also were stepping
- and should stop for that. So fall through and
- test for stepping. But, if not stepping,
- do not stop. */
+ printed = 1;
+ target_terminal_ours_for_output ();
+#ifdef PRINT_RANDOM_SIGNAL
+ PRINT_RANDOM_SIGNAL (stop_signal);
+#else
+ printf ("\nProgram received signal %d, %s\n",
+ stop_signal,
+ stop_signal < NSIG
+ ? sys_siglist[stop_signal]
+ : "(undocumented)");
+#endif /* PRINT_RANDOM_SIGNAL */
+ fflush (stdout);
}
+ if (stop_signal >= NSIG
+ || signal_stop[stop_signal])
+ break;
+ /* If not going to stop, give terminal back
+ if we took it away. */
+ else if (printed)
+ target_terminal_inferior ();
+
+ /* Note that virtually all the code below does `if !random_signal'.
+ Perhaps this code should end with a goto or continue. At least
+ one (now fixed) bug was caused by this -- a !random_signal was
+ missing in one of the tests below. */
+ }
+
+ /* Handle cases caused by hitting a breakpoint. */
+
+ if (!random_signal
+ && (bpstat_explains_signal (stop_bpstat) || stop_step_resume_break))
+ {
+ /* Does a breakpoint want us to stop? */
+ if (bpstat_stop (stop_bpstat))
+ {
+ stop_print_frame = bpstat_should_print (stop_bpstat);
+ break;
+ }
+ /* But if we have hit the step-resumption breakpoint,
+ remove it. It has done its job getting us here.
+ The sp test is to make sure that we don't get hung
+ up in recursive calls in functions without frame
+ pointers. If the stack pointer isn't outside of
+ where the breakpoint was set (within a routine to be
+ stepped over), we're in the middle of a recursive
+ call. Not true for reg window machines (sparc)
+ because the must change frames to call things and
+ the stack pointer doesn't have to change if it
+ the bp was set in a routine without a frame (pc can
+ be stored in some other window).
+
+ The removal of the sp test is to allow calls to
+ alloca. Nasty things were happening. Oh, well,
+ gdb can only handle one level deep of lack of
+ frame pointer. */
+ if (stop_step_resume_break
+ && (step_frame_address == 0
+ || (stop_frame_address == step_frame_address)))
+ {
+ remove_step_breakpoint ();
+ step_resume_break_address = 0;
- /* If this is the breakpoint at the end of a stack dummy,
- just stop silently. */
- if (stop_sp INNER_THAN stop_pc && stop_pc INNER_THAN stop_frame)
+ /* If were waiting for a trap, hitting the step_resume_break
+ doesn't count as getting it. */
+ if (trap_expected)
+ another_trap = 1;
+ }
+ /* Otherwise, must remove breakpoints and single-step
+ to get us past the one we hit. */
+ else
{
- stop_print_frame = 0;
- stop_stack_dummy = 1;
+ remove_breakpoints ();
+ remove_step_breakpoint ();
+ breakpoints_inserted = 0;
+ another_trap = 1;
+ }
+
+ /* We come here if we hit a breakpoint but should not
+ stop for it. Possibly we also were stepping
+ and should stop for that. So fall through and
+ test for stepping. But, if not stepping,
+ do not stop. */
+ }
+
+ /* If this is the breakpoint at the end of a stack dummy,
+ just stop silently. */
+ if (!random_signal
+ && PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address))
+ {
+ stop_print_frame = 0;
+ stop_stack_dummy = 1;
+#ifdef HP_OS_BUG
+ trap_expected_after_continue = 1;
+#endif
+ break;
+ }
+
+ if (step_resume_break_address)
+ /* Having a step-resume breakpoint overrides anything
+ else having to do with stepping commands until
+ that breakpoint is reached. */
+ ;
+ /* If stepping through a line, keep going if still within it. */
+ else if (!random_signal
+ && step_range_end
+ && stop_pc >= step_range_start
+ && stop_pc < step_range_end
+ /* The step range might include the start of the
+ function, so if we are at the start of the
+ step range and either the stack or frame pointers
+ just changed, we've stepped outside */
+ && !(stop_pc == step_range_start
+ && stop_frame_address
+ && (stop_sp INNER_THAN prev_sp
+ || stop_frame_address != step_frame_address)))
+ {
+#if 0
+ /* When "next"ing through a function,
+ This causes an extra stop at the end.
+ Is there any reason for this?
+ It's confusing to the user. */
+ /* Don't step through the return from a function
+ unless that is the first instruction stepped through. */
+ if (ABOUT_TO_RETURN (stop_pc))
+ {
+ stop_step = 1;
break;
}
+#endif
+ }
+
+ /* We stepped out of the stepping range. See if that was due
+ to a subroutine call that we should proceed to the end of. */
+ else if (!random_signal && step_range_end)
+ {
+ if (stop_func_start)
+ {
+ prologue_pc = stop_func_start;
+ SKIP_PROLOGUE (prologue_pc);
+ }
- if (step_resume_break_address)
- /* Having a step-resume breakpoint overrides anything
- else having to do with stepping commands until
- that breakpoint is reached. */
- ;
- /* If stepping through a line, keep going if still within it. */
- else if (!random_signal
- && step_range_end
- && stop_pc >= step_range_start
- && stop_pc < step_range_end)
+ /* Did we just take a signal? */
+ if (IN_SIGTRAMP (stop_pc, stop_func_name)
+ && !IN_SIGTRAMP (prev_pc, prev_func_name))
{
- /* Don't step through the return from a function
- unless that is the first instruction stepped through. */
- if (ABOUT_TO_RETURN (stop_pc))
- {
- stop_step = 1;
- break;
- }
+ /* This code is needed at least in the following case:
+ The user types "next" and then a signal arrives (before
+ the "next" is done). */
+ /* We've just taken a signal; go until we are back to
+ the point where we took it and one more. */
+ step_resume_break_address = prev_pc;
+ step_resume_break_duplicate =
+ breakpoint_here_p (step_resume_break_address);
+ if (breakpoints_inserted)
+ insert_step_breakpoint ();
+ /* Make sure that the stepping range gets us past
+ that instruction. */
+ if (step_range_end == 1)
+ step_range_end = (step_range_start = prev_pc) + 1;
+ remove_breakpoints_on_following_step = 1;
}
- /* We stepped out of the stepping range. See if that was due
- to a subroutine call that we should proceed to the end of. */
- else if (!random_signal && step_range_end)
+ /* ==> See comments at top of file on this algorithm. <==*/
+
+ else if (stop_pc == stop_func_start
+ && (stop_func_start != prev_func_start
+ || prologue_pc != stop_func_start
+ || stop_sp != prev_sp))
{
- newfun = find_pc_function (stop_pc);
- newmisc = -1;
- if (newfun)
- {
- newfun_pc = BLOCK_START (SYMBOL_BLOCK_VALUE (newfun))
- + FUNCTION_START_OFFSET;
- }
- else
- {
- newmisc = find_pc_misc_function (stop_pc);
- if (newmisc >= 0)
- newfun_pc = misc_function_vector[newmisc].address
- + FUNCTION_START_OFFSET;
- else newfun_pc = 0;
- }
- if (stop_pc == newfun_pc
- && (step_over_calls > 0 || (step_over_calls && newfun == 0)))
+ /* It's a subroutine call */
+ if (step_over_calls > 0
+ || (step_over_calls && find_pc_function (stop_pc) == 0))
{
/* A subroutine call has happened. */
/* Set a special breakpoint after the return */
- step_resume_break_address = SAVED_PC_AFTER_CALL (stop_frame);
+ step_resume_break_address =
+ ADDR_BITS_REMOVE
+ (SAVED_PC_AFTER_CALL (get_current_frame ()));
step_resume_break_duplicate
= breakpoint_here_p (step_resume_break_address);
if (breakpoints_inserted)
}
/* Subroutine call with source code we should not step over.
Do step to the first line of code in it. */
- else if (stop_pc == newfun_pc && step_over_calls)
+ else if (step_over_calls)
{
- SKIP_PROLOGUE (newfun_pc);
- sal = find_pc_line (newfun_pc, 0);
+ SKIP_PROLOGUE (stop_func_start);
+ sal = find_pc_line (stop_func_start, 0);
/* Use the step_resume_break to step until
the end of the prologue, even if that involves jumps
(as it seems to on the vax under 4.2). */
/* If the prologue ends in the middle of a source line,
continue to the end of that source line.
Otherwise, just go to end of prologue. */
- if (sal.end && sal.pc != newfun_pc)
- step_resume_break_address = sal.end;
+#ifdef PROLOGUE_FIRSTLINE_OVERLAP
+ /* no, don't either. It skips any code that's
+ legitimately on the first line. */
+#else
+ if (sal.end && sal.pc != stop_func_start)
+ stop_func_start = sal.end;
+#endif
+
+ if (stop_func_start == stop_pc)
+ {
+ /* We are already there: stop now. */
+ stop_step = 1;
+ break;
+ }
else
- step_resume_break_address = newfun_pc;
-
- step_resume_break_duplicate
- = breakpoint_here_p (step_resume_break_address);
- if (breakpoints_inserted)
- insert_step_breakpoint ();
- /* Do not specify what the fp should be when we stop
- since on some machines the prologue
- is where the new fp value is established. */
- step_frame = 0;
- /* And make sure stepping stops right away then. */
- step_range_end = step_range_start;
+ /* Put the step-breakpoint there and go until there. */
+ {
+ step_resume_break_address = stop_func_start;
+
+ step_resume_break_duplicate
+ = breakpoint_here_p (step_resume_break_address);
+ if (breakpoints_inserted)
+ insert_step_breakpoint ();
+ /* Do not specify what the fp should be when we stop
+ since on some machines the prologue
+ is where the new fp value is established. */
+ step_frame_address = 0;
+ /* And make sure stepping stops right away then. */
+ step_range_end = step_range_start;
+ }
}
- /* No subroutince call; stop now. */
else
{
+ /* We get here only if step_over_calls is 0 and we
+ just stepped into a subroutine. I presume
+ that step_over_calls is only 0 when we're
+ supposed to be stepping at the assembly
+ language level.*/
stop_step = 1;
break;
}
}
+ /* No subroutine call; stop now. */
+ else
+ {
+ /* We've wandered out of the step range (but we haven't done a
+ subroutine call or return (that's handled elsewhere)). We
+ don't really want to stop until we encounter the start of a
+ new statement. If so, we stop. Otherwise, we reset
+ step_range_start and step_range_end, and just continue. */
+ sal = find_pc_line(stop_pc, 0);
+
+ if (step_range_end == 1 || /* Don't do this for stepi/nexti */
+ sal.line == 0 || /* Stop now if no line # info */
+ (current_line != sal.line
+ && stop_pc == sal.pc)) {
+ stop_step = 1;
+ break;
+ } else {
+ /* This is probably not necessary, but it probably makes
+ stepping more efficient, as we avoid calling find_pc_line()
+ for each instruction we step over. */
+ step_range_start = sal.pc;
+ step_range_end = sal.end;
+ }
+ }
}
+ else if (trap_expected
+ && IN_SIGTRAMP (stop_pc, stop_func_name)
+ && !IN_SIGTRAMP (prev_pc, prev_func_name))
+ {
+ /* What has happened here is that we have just stepped the inferior
+ with a signal (because it is a signal which shouldn't make
+ us stop), thus stepping into sigtramp.
+
+ So we need to set a step_resume_break_address breakpoint
+ and continue until we hit it, and then step. */
+ step_resume_break_address = prev_pc;
+ /* Always 1, I think, but it's probably easier to have
+ the step_resume_break as usual rather than trying to
+ re-use the breakpoint which is already there. */
+ step_resume_break_duplicate =
+ breakpoint_here_p (step_resume_break_address);
+ if (breakpoints_inserted)
+ insert_step_breakpoint ();
+ remove_breakpoints_on_following_step = 1;
+ another_trap = 1;
+ }
+
+ /* Save the pc before execution, to compare with pc after stop. */
+ prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */
+ prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER
+ BREAK is defined, the
+ original pc would not have
+ been at the start of a
+ function. */
+ prev_func_name = stop_func_name;
+ prev_sp = stop_sp;
+
/* If we did not do break;, it means we should keep
running the inferior and not return to debugger. */
- /* If trap_expected is 2, it means continue once more
- and insert breakpoints at the next trap.
- If trap_expected is 1 and the signal was SIGSEGV, it means
- the shell is doing some memory allocation--just resume it
- with SIGSEGV.
- Otherwise insert breakpoints now, and possibly single step. */
-
- if (trap_expected > 1)
- {
- trap_expected--;
- running_in_shell = 1;
- resume (0, 0);
- }
- else if (running_in_shell && stop_signal == SIGSEGV)
+ if (trap_expected && stop_signal != SIGTRAP)
{
- resume (0, SIGSEGV);
+ /* We took a signal (which we are supposed to pass through to
+ the inferior, else we'd have done a break above) and we
+ haven't yet gotten our trap. Simply continue. */
+ resume ((step_range_end && !step_resume_break_address)
+ || (trap_expected && !step_resume_break_address)
+ || bpstat_should_step (),
+ stop_signal);
}
else
{
- /* Here, we are not awaiting another exec to get
- the program we really want to debug.
+ /* Either the trap was not expected, but we are continuing
+ anyway (the user asked that this signal be passed to the
+ child)
+ -- or --
+ The signal was SIGTRAP, e.g. it was our signal, but we
+ decided we should resume from it.
+
+ We're going to run this baby now!
+
Insert breakpoints now, unless we are trying
to one-proceed past a breakpoint. */
- running_in_shell = 0;
- if (!breakpoints_inserted && !another_trap)
+ /* If we've just finished a special step resume and we don't
+ want to hit a breakpoint, pull em out. */
+#ifdef TDESC
+ if (!tdesc_handle)
+ {
+ init_tdesc();
+ safe_to_init_tdesc_context = 1;
+ }
+#endif
+
+ if (!step_resume_break_address &&
+ remove_breakpoints_on_following_step)
+ {
+ remove_breakpoints_on_following_step = 0;
+ remove_breakpoints ();
+ breakpoints_inserted = 0;
+ }
+ else if (!breakpoints_inserted &&
+ (step_resume_break_address != NULL || !another_trap))
{
insert_step_breakpoint ();
breakpoints_failed = insert_breakpoints ();
if (stop_signal == SIGTRAP)
stop_signal = 0;
+#ifdef SHIFT_INST_REGS
+ /* I'm not sure when this following segment applies. I do know, now,
+ that we shouldn't rewrite the regs when we were stopped by a
+ random signal from the inferior process. */
+
+ if (!bpstat_explains_signal (stop_bpstat)
+ && (stop_signal != SIGCLD)
+ && !stopped_by_random_signal)
+ {
+ CORE_ADDR pc_contents = read_register (PC_REGNUM);
+ CORE_ADDR npc_contents = read_register (NPC_REGNUM);
+ if (pc_contents != npc_contents)
+ {
+ write_register (NNPC_REGNUM, npc_contents);
+ write_register (NPC_REGNUM, pc_contents);
+ }
+ }
+#endif /* SHIFT_INST_REGS */
+
resume ((step_range_end && !step_resume_break_address)
- || trap_expected,
+ || (trap_expected && !step_resume_break_address)
+ || bpstat_should_step (),
stop_signal);
}
}
+ if (target_has_execution)
+ {
+ /* Assuming the inferior still exists, set these up for next
+ time, just like we did above if we didn't break out of the
+ loop. */
+ prev_pc = read_pc ();
+ prev_func_start = stop_func_start;
+ prev_func_name = stop_func_name;
+ prev_sp = stop_sp;
+ }
}
\f
/* Here to return control to GDB when the inferior stops for real.
Print appropriate messages, remove breakpoints, give terminal our modes.
- RUNNING_IN_SHELL nonzero means the shell got a signal before
- exec'ing the program we wanted to run.
STOP_PRINT_FRAME nonzero means print the executing frame
(pc, function, args, file, line number and line text).
BREAKPOINTS_FAILED nonzero means stop was due to error
attempting to insert breakpoints. */
-static void
+void
normal_stop ()
{
+ /* Make sure that the current_frame's pc is correct. This
+ is a correction for setting up the frame info before doing
+ DECR_PC_AFTER_BREAK */
+ if (target_has_execution)
+ (get_current_frame ())->pc = read_pc ();
+
if (breakpoints_failed)
{
- terminal_ours_for_output ();
+ target_terminal_ours_for_output ();
print_sys_errmsg ("ptrace", breakpoints_failed);
printf ("Stopped; cannot insert breakpoints.\n\
The same program may be running in another process.\n");
}
- if (inferior_pid)
+ if (target_has_execution)
remove_step_breakpoint ();
- if (inferior_pid && breakpoints_inserted)
+ if (target_has_execution && breakpoints_inserted)
if (remove_breakpoints ())
{
- terminal_ours_for_output ();
+ target_terminal_ours_for_output ();
printf ("Cannot remove breakpoints because program is no longer writable.\n\
-It must be running in another process.\n\
+It might be running in another process.\n\
Further execution is probably impossible.\n");
}
/* Delete the breakpoint we stopped at, if it wants to be deleted.
Delete any breakpoint that is to be deleted at the next stop. */
- breakpoint_auto_delete (stop_breakpoint);
+ breakpoint_auto_delete (stop_bpstat);
+
+ /* If an auto-display called a function and that got a signal,
+ delete that auto-display to avoid an infinite recursion. */
+
+ if (stopped_by_random_signal)
+ disable_current_display ();
if (step_multi && stop_step)
return;
- terminal_ours ();
+ target_terminal_ours ();
- if (running_in_shell)
- {
- if (stop_signal == SIGSEGV)
- printf ("\
-You have just encountered a bug in \"sh\". GDB starts your program\n\
-by running \"sh\" with a command to exec your program.\n\
-This is so that \"sh\" will process wildcards and I/O redirection.\n\
-This time, \"sh\" crashed.\n\
-\n\
-One known bug in \"sh\" bites when the environment takes up a lot of space.\n\
-Try \"info env\" to see the environment; then use \"unset-env\" to kill\n\
-some variables whose values are large; then do \"run\" again.\n\
-\n\
-If that works, you might want to put those \"unset-env\" commands\n\
-into a \".gdbinit\" file in this directory so they will happen every time.\n");
- /* Don't confuse user with his program's symbols on sh's data. */
- stop_print_frame = 0;
- }
-
- if (inferior_pid == 0)
+ if (!target_has_stack)
return;
/* Select innermost stack frame except on return from a stack dummy routine,
- or if the program has exited. */
+ or if the program has exited. Print it without a level number if
+ we have changed functions or hit a breakpoint. Print source line
+ if we have one. */
if (!stop_stack_dummy)
{
- select_frame (stop_frame, 0);
+ select_frame (get_current_frame (), 0);
if (stop_print_frame)
{
- if (stop_breakpoint > 0)
- printf ("\nBpt %d, ", stop_breakpoint);
- print_sel_frame (stop_step
- && step_frame == stop_frame
- && step_start_function == find_pc_function (stop_pc));
+ int source_only;
+
+ source_only = bpstat_print (stop_bpstat);
+ source_only = source_only ||
+ ( stop_step
+ && step_frame_address == stop_frame_address
+ && step_start_function == find_pc_function (stop_pc));
+
+ print_stack_frame (selected_frame, -1, source_only? -1: 1);
+
/* Display the auto-display expressions. */
do_displays ();
}
}
- /* Save the function value return registers
+ /* Save the function value return registers, if we care.
We might be about to restore their previous contents. */
- read_register_bytes (0, stop_registers, REGISTER_BYTES);
+ if (proceed_to_finish)
+ read_register_bytes (0, stop_registers, REGISTER_BYTES);
if (stop_stack_dummy)
{
- /* Pop the empty frame that contains the stack dummy. */
+ /* Pop the empty frame that contains the stack dummy.
+ POP_FRAME ends with a setting of the current frame, so we
+ can use that next. */
POP_FRAME;
- select_frame (read_register (FP_REGNUM), 0);
+ select_frame (get_current_frame (), 0);
}
}
\f
insert_step_breakpoint ()
{
if (step_resume_break_address && !step_resume_break_duplicate)
- {
- read_memory (step_resume_break_address,
- step_resume_break_shadow, sizeof break_insn);
- write_memory (step_resume_break_address,
- break_insn, sizeof break_insn);
- }
+ target_insert_breakpoint (step_resume_break_address,
+ step_resume_break_shadow);
}
static void
remove_step_breakpoint ()
{
if (step_resume_break_address && !step_resume_break_duplicate)
- write_memory (step_resume_break_address, step_resume_break_shadow,
- sizeof break_insn);
+ target_remove_breakpoint (step_resume_break_address,
+ step_resume_break_shadow);
}
\f
+static void
+sig_print_header ()
+{
+ printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n");
+}
+
+static void
+sig_print_info (number)
+ int number;
+{
+ char *abbrev = sig_abbrev(number);
+ if (abbrev == NULL)
+ printf_filtered ("%d\t\t", number);
+ else
+ printf_filtered ("SIG%s (%d)\t", abbrev, number);
+ printf_filtered ("%s\t", signal_stop[number] ? "Yes" : "No");
+ printf_filtered ("%s\t", signal_print[number] ? "Yes" : "No");
+ printf_filtered ("%s\t\t", signal_program[number] ? "Yes" : "No");
+ printf_filtered ("%s\n", sys_siglist[number]);
+}
+
/* Specify how various signals in the inferior should be handled. */
static void
int from_tty;
{
register char *p = args;
- int signum;
+ int signum = 0;
register int digits, wordlen;
+ char *nextarg;
if (!args)
error_no_arg ("signal to handle");
while (*p)
{
/* Find the end of the next word in the args. */
- for (wordlen = 0; p[wordlen] && p[wordlen] != ' ' && p[wordlen] != '\t';
+ for (wordlen = 0;
+ p[wordlen] && p[wordlen] != ' ' && p[wordlen] != '\t';
wordlen++);
+ /* Set nextarg to the start of the word after the one we just
+ found, and null-terminate this one. */
+ if (p[wordlen] == '\0')
+ nextarg = p + wordlen;
+ else
+ {
+ p[wordlen] = '\0';
+ nextarg = p + wordlen + 1;
+ }
+
+
for (digits = 0; p[digits] >= '0' && p[digits] <= '9'; digits++);
- /* If it is all digits, it is signal number to operate on. */
- if (digits == wordlen)
+ if (signum == 0)
{
- signum = atoi (p);
+ /* It is the first argument--must be the signal to operate on. */
+ if (digits == wordlen)
+ {
+ /* Numeric. */
+ signum = atoi (p);
+ if (signum <= 0 || signum >= NSIG)
+ {
+ p[wordlen] = '\0';
+ error ("Invalid signal %s given as argument to \"handle\".", p);
+ }
+ }
+ else
+ {
+ /* Symbolic. */
+ signum = sig_number (p);
+ if (signum == -1)
+ error ("No such signal \"%s\"", p);
+ }
+
if (signum == SIGTRAP || signum == SIGINT)
{
- if (!query ("Signal %d is used by the debugger.\nAre you sure you want to change it? ", signum))
+ if (!query ("SIG%s is used by the debugger.\nAre you sure you want to change it? ", sig_abbrev (signum)))
error ("Not confirmed.");
}
}
- else if (signum == 0)
- error ("First argument is not a signal number.");
-
/* Else, if already got a signal number, look for flag words
saying what to do for it. */
else if (!strncmp (p, "stop", wordlen))
/* Not a number and not a recognized flag word => complain. */
else
{
- p[wordlen] = 0;
error ("Unrecognized flag word: \"%s\".", p);
}
/* Find start of next word. */
- p += wordlen;
+ p = nextarg;
while (*p == ' ' || *p == '\t') p++;
}
if (from_tty)
{
/* Show the results. */
- printf ("Number\tStop\tPrint\tPass to program\tDescription\n");
- printf ("%d\t", signum);
- printf ("%s\t", signal_stop[signum] ? "Yes" : "No");
- printf ("%s\t", signal_print[signum] ? "Yes" : "No");
- printf ("%s\t\t", signal_program[signum] ? "Yes" : "No");
- printf ("%s\n", sys_siglist[signum]);
+ sig_print_header ();
+ sig_print_info (signum);
}
}
char *signum_exp;
{
register int i;
- printf ("Number\tStop\tPrint\tPass to program\tDescription\n");
+ sig_print_header ();
if (signum_exp)
{
- i = parse_and_eval_address (signum_exp);
- printf ("%d\t", i);
- printf ("%s\t", signal_stop[i] ? "Yes" : "No");
- printf ("%s\t", signal_print[i] ? "Yes" : "No");
- printf ("%s\t\t", signal_program[i] ? "Yes" : "No");
- printf ("%s\n", sys_siglist[i]);
+ /* First see if this is a symbol name. */
+ i = sig_number (signum_exp);
+ if (i == -1)
+ {
+ /* Nope, maybe it's an address which evaluates to a signal
+ number. */
+ i = parse_and_eval_address (signum_exp);
+ if (i >= NSIG || i < 0)
+ error ("Signal number out of bounds.");
+ }
+ sig_print_info (i);
return;
}
- printf ("\n");
+ printf_filtered ("\n");
for (i = 0; i < NSIG; i++)
{
QUIT;
- if (i > 0 && i % 16 == 0)
+
+ sig_print_info (i);
+ }
+
+ printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
+}
+\f
+/* Save all of the information associated with the inferior<==>gdb
+ connection. INF_STATUS is a pointer to a "struct inferior_status"
+ (defined in inferior.h). */
+
+void
+save_inferior_status (inf_status, restore_stack_info)
+ struct inferior_status *inf_status;
+ int restore_stack_info;
+{
+ inf_status->pc_changed = pc_changed;
+ inf_status->stop_signal = stop_signal;
+ inf_status->stop_pc = stop_pc;
+ inf_status->stop_frame_address = stop_frame_address;
+ inf_status->stop_step = stop_step;
+ inf_status->stop_stack_dummy = stop_stack_dummy;
+ inf_status->stopped_by_random_signal = stopped_by_random_signal;
+ inf_status->trap_expected = trap_expected;
+ inf_status->step_range_start = step_range_start;
+ inf_status->step_range_end = step_range_end;
+ inf_status->step_frame_address = step_frame_address;
+ inf_status->step_over_calls = step_over_calls;
+ inf_status->step_resume_break_address = step_resume_break_address;
+ inf_status->stop_after_trap = stop_after_trap;
+ inf_status->stop_soon_quietly = stop_soon_quietly;
+ /* Save original bpstat chain here; replace it with copy of chain.
+ If caller's caller is walking the chain, they'll be happier if we
+ hand them back the original chain when restore_i_s is called. */
+ inf_status->stop_bpstat = stop_bpstat;
+ stop_bpstat = bpstat_copy (stop_bpstat);
+ inf_status->breakpoint_proceeded = breakpoint_proceeded;
+ inf_status->restore_stack_info = restore_stack_info;
+ inf_status->proceed_to_finish = proceed_to_finish;
+
+ bcopy (stop_registers, inf_status->stop_registers, REGISTER_BYTES);
+
+ record_selected_frame (&(inf_status->selected_frame_address),
+ &(inf_status->selected_level));
+ return;
+}
+
+void
+restore_inferior_status (inf_status)
+ struct inferior_status *inf_status;
+{
+ FRAME fid;
+ int level = inf_status->selected_level;
+
+ pc_changed = inf_status->pc_changed;
+ stop_signal = inf_status->stop_signal;
+ stop_pc = inf_status->stop_pc;
+ stop_frame_address = inf_status->stop_frame_address;
+ stop_step = inf_status->stop_step;
+ stop_stack_dummy = inf_status->stop_stack_dummy;
+ stopped_by_random_signal = inf_status->stopped_by_random_signal;
+ trap_expected = inf_status->trap_expected;
+ step_range_start = inf_status->step_range_start;
+ step_range_end = inf_status->step_range_end;
+ step_frame_address = inf_status->step_frame_address;
+ step_over_calls = inf_status->step_over_calls;
+ step_resume_break_address = inf_status->step_resume_break_address;
+ stop_after_trap = inf_status->stop_after_trap;
+ stop_soon_quietly = inf_status->stop_soon_quietly;
+ bpstat_clear (&stop_bpstat);
+ stop_bpstat = inf_status->stop_bpstat;
+ breakpoint_proceeded = inf_status->breakpoint_proceeded;
+ proceed_to_finish = inf_status->proceed_to_finish;
+
+ bcopy (inf_status->stop_registers, stop_registers, REGISTER_BYTES);
+
+ /* The inferior can be gone if the user types "print exit(0)"
+ (and perhaps other times). */
+ if (target_has_stack && inf_status->restore_stack_info)
+ {
+ fid = find_relative_frame (get_current_frame (),
+ &level);
+
+ /* If inf_status->selected_frame_address is NULL, there was no
+ previously selected frame. */
+ if (fid == 0 ||
+ FRAME_FP (fid) != inf_status->selected_frame_address ||
+ level != 0)
{
- printf ("[Type Return to see more]");
- fflush (stdout);
- read_line ();
+#if 0
+ /* I'm not sure this error message is a good idea. I have
+ only seen it occur after "Can't continue previously
+ requested operation" (we get called from do_cleanups), in
+ which case it just adds insult to injury (one confusing
+ error message after another. Besides which, does the
+ user really care if we can't restore the previously
+ selected frame? */
+ fprintf (stderr, "Unable to restore previously selected frame.\n");
+#endif
+ select_frame (get_current_frame (), 0);
+ return;
}
- printf ("%d\t", i);
- printf ("%s\t", signal_stop[i] ? "Yes" : "No");
- printf ("%s\t", signal_print[i] ? "Yes" : "No");
- printf ("%s\t\t", signal_program[i] ? "Yes" : "No");
- printf ("%s\n", sys_siglist[i]);
+
+ select_frame (fid, inf_status->selected_level);
}
-
- printf ("\nUse the \"handle\" command to change these tables.\n");
}
+
\f
-static
-initialize ()
+void
+_initialize_infrun ()
{
register int i;
#endif /* SIGURG */
}
-END_FILE
projects / binutils.git / blobdiff