-/* 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!
-*/
+/* Target-struct-independent code to start (run) and stop an inferior process.
+ Copyright 1986, 1987, 1988, 1989, 1991, 1992, 1993
+ 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
Current and previous sp.
Current and previous start of current function.
- If the start's of the functions don't match, then
+ If the starts of the functions don't match, then
a) We did a subroutine call.
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.
- randy@wheaties.ai.mit.edu). This is true (albeit slipperly
+ bug-gdb@prep.ai.mit.edu). This is true (albeit slipperly
so) on all machines I'm aware of:
m68k: Call changes stack pointer. Regular jumps don't.
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 "defs.h"
-#include "param.h"
+#include <string.h>
+#include <ctype.h>
#include "symtab.h"
#include "frame.h"
#include "inferior.h"
+#include "breakpoint.h"
#include "wait.h"
+#include "gdbcore.h"
+#include "gdbcmd.h"
+#include "target.h"
-#include <stdio.h>
#include <signal.h>
/* unistd.h is needed to #define X_OK */
#include <sys/file.h>
#endif
-/* The idiots at Apple only define X_OK if POSIX is defined. Fuck 'em. */
-#ifndef X_OK
-#define X_OK 1 /* Execute permission for access() */
+/* Prototypes for local functions */
+
+static void
+signals_info PARAMS ((char *, int));
+
+static void
+handle_command PARAMS ((char *, int));
+
+static void
+sig_print_info PARAMS ((int));
+
+static void
+sig_print_header PARAMS ((void));
+
+static void
+resume_cleanups PARAMS ((int));
+
+static int
+hook_stop_stub PARAMS ((char *));
+
+/* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the
+ program. It needs to examine the jmp_buf argument and extract the PC
+ from it. The return value is non-zero on success, zero otherwise. */
+#ifndef GET_LONGJMP_TARGET
+#define GET_LONGJMP_TARGET(PC_ADDR) 0
#endif
-#ifdef UMAX_PTRACE
-#include <sys/param.h>
-#include <sys/ptrace.h>
-#endif /* UMAX_PTRACE */
-extern char *sys_siglist[];
-extern int errno;
+/* Some machines have trampoline code that sits between function callers
+ and the actual functions themselves. If this machine doesn't have
+ such things, disable their processing. */
+#ifndef SKIP_TRAMPOLINE_CODE
+#define SKIP_TRAMPOLINE_CODE(pc) 0
+#endif
-/* Tables of how to react to signals; the user sets them. */
+/* For SVR4 shared libraries, each call goes through a small piece of
+ trampoline code in the ".init" section. IN_SOLIB_TRAMPOLINE evaluates
+ to nonzero if we are current stopped in one of these. */
+#ifndef IN_SOLIB_TRAMPOLINE
+#define IN_SOLIB_TRAMPOLINE(pc,name) 0
+#endif
-static char signal_stop[NSIG];
-static char signal_print[NSIG];
-static char signal_program[NSIG];
+/* On some systems, the PC may be left pointing at an instruction that won't
+ actually be executed. This is usually indicated by a bit in the PSW. If
+ we find ourselves in such a state, then we step the target beyond the
+ nullified instruction before returning control to the user so as to avoid
+ confusion. */
-/* Nonzero if breakpoints are now inserted in the inferior. */
+#ifndef INSTRUCTION_NULLIFIED
+#define INSTRUCTION_NULLIFIED 0
+#endif
-static int breakpoints_inserted;
+/* Tables of how to react to signals; the user sets them. */
-/* Function inferior was in as of last step command. */
+static unsigned char *signal_stop;
+static unsigned char *signal_print;
+static unsigned char *signal_program;
-static struct symbol *step_start_function;
+#define SET_SIGS(nsigs,sigs,flags) \
+ do { \
+ int signum = (nsigs); \
+ while (signum-- > 0) \
+ if ((sigs)[signum]) \
+ (flags)[signum] = 1; \
+ } while (0)
-/* This is the sequence of bytes we insert for a breakpoint. */
+#define UNSET_SIGS(nsigs,sigs,flags) \
+ do { \
+ int signum = (nsigs); \
+ while (signum-- > 0) \
+ if ((sigs)[signum]) \
+ (flags)[signum] = 0; \
+ } while (0)
-static char break_insn[] = BREAKPOINT;
-/* Nonzero => address for special breakpoint for resuming stepping. */
+/* Command list pointer for the "stop" placeholder. */
-static CORE_ADDR step_resume_break_address;
+static struct cmd_list_element *stop_command;
-/* Original contents of the byte where the special breakpoint is. */
+/* Nonzero if breakpoints are now inserted in the inferior. */
-static char step_resume_break_shadow[sizeof break_insn];
+static int breakpoints_inserted;
-/* Nonzero means the special breakpoint is a duplicate
- so it has not itself been inserted. */
+/* Function inferior was in as of last step command. */
-static int step_resume_break_duplicate;
+static struct symbol *step_start_function;
-/* 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;
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?). */
-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;
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 ();
+\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). */
+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(sig); /* 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);
+}
\f
/* Clear out all variables saying what to do when inferior is continued.
step_range_end = 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
oneproc = 1;
}
else
- {
- write_register (PC_REGNUM, addr);
-#ifdef NPC_REGNUM
- write_register (NPC_REGNUM, addr + 4);
-#endif
- }
+ write_pc (addr);
if (trap_expected_after_continue)
{
}
/* 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 ();
}
-/* 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;
-}
-
-/* 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. */
-
-void
-start_inferior ()
-{
- /* 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. */
-
-#ifdef START_INFERIOR_TRAPS_EXPECTED
- trap_expected = START_INFERIOR_TRAPS_EXPECTED;
-#else
- trap_expected = 2;
-#endif
-
- running_in_shell = 0; /* Set to 1 at first SIGTRAP, 0 at second. */
- trap_expected_after_continue = 0;
- breakpoints_inserted = 0;
- mark_breakpoints_out ();
-
- /* Set up the "saved terminal modes" of the inferior
- based on what modes we are starting it with. */
- terminal_init_inferior ();
-
- /* Install inferior's terminal modes. */
- terminal_inferior ();
-
- if (remote_debugging)
- {
- trap_expected = 0;
- fetch_inferior_registers();
- set_current_frame (create_new_frame (read_register (FP_REGNUM),
- read_pc ()));
- stop_frame_address = FRAME_FP (get_current_frame());
- inferior_pid = 3;
- if (insert_breakpoints())
- fatal("Can't insert breakpoints");
- breakpoints_inserted = 1;
- proceed(-1, -1, 0);
- }
- else
- {
- wait_for_inferior ();
- normal_stop ();
- }
-}
+/* 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;
+\f
/* Start remote-debugging of a machine over a serial link. */
void
start_remote ()
{
+ init_wait_for_inferior ();
clear_proceed_status ();
- running_in_shell = 0;
+ stop_soon_quietly = 1;
trap_expected = 0;
- inferior_pid = 3;
- breakpoints_inserted = 0;
- mark_breakpoints_out ();
wait_for_inferior ();
- normal_stop();
+ normal_stop ();
}
-#ifdef ATTACH_DETACH
-
-/* Attach to process PID, then initialize for debugging it
- and wait for the trace-trap that results from attaching. */
+/* Initialize static vars when a new inferior begins. */
void
-attach_program (pid)
- int pid;
+init_wait_for_inferior ()
{
- attach (pid);
- inferior_pid = pid;
+ /* 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 ();
- terminal_init_inferior ();
- clear_proceed_status ();
- stop_after_attach = 1;
- /*proceed (-1, 0, -2);*/
- wait_for_inferior ();
- normal_stop ();
+ stop_signal = 0; /* Don't confuse first call to proceed(). */
+}
+
+static void
+delete_breakpoint_current_contents (arg)
+ PTR arg;
+{
+ struct breakpoint **breakpointp = (struct breakpoint **)arg;
+ if (*breakpointp != NULL)
+ delete_breakpoint (*breakpointp);
}
-#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;
+ struct cleanup *old_cleanups;
WAITTYPE w;
- CORE_ADDR pc;
- int tem;
int another_trap;
int random_signal;
- CORE_ADDR stop_sp, prev_sp;
- CORE_ADDR prev_func_start, stop_func_start;
- CORE_ADDR prologue_pc;
- int stop_step_resume_break;
- CORE_ADDR step_resume_break_sp;
- int newmisc;
- int newfun_pc;
- struct symbol *newfun;
+ CORE_ADDR stop_sp;
+ CORE_ADDR stop_func_start;
+ char *stop_func_name;
+ CORE_ADDR prologue_pc, tmp;
struct symtab_and_line sal;
- int prev_pc;
- extern CORE_ADDR text_end;
+ int remove_breakpoints_on_following_step = 0;
+ int current_line;
+ int handling_longjmp = 0; /* FIXME */
+ struct symtab *symtab;
+ struct breakpoint *step_resume_breakpoint = NULL;
- prev_pc = read_pc ();
- prev_func_start = get_pc_function_start (prev_pc) + FUNCTION_START_OFFSET;
- prev_sp = read_register (SP_REGNUM);
+ old_cleanups = make_cleanup (delete_breakpoint_current_contents,
+ &step_resume_breakpoint);
+ sal = find_pc_line(prev_pc, 0);
+ current_line = sal.line;
while (1)
{
- /* Clean up saved state that will become invalid */
+ /* Clean up saved state that will become invalid. */
pc_changed = 0;
flush_cached_frames ();
+ registers_changed ();
- if (remote_debugging)
- remote_wait (&w);
- else
- {
- pid = wait (&w);
- if (pid != inferior_pid)
- continue;
- }
+ target_wait (&w);
+
+#ifdef SIGTRAP_STOP_AFTER_LOAD
- /* See if the process still exists; clean up if it doesn't. */
+ /* Somebody called load(2), and it gave us a "trap signal after load".
+ Ignore it gracefully. */
+
+ SIGTRAP_STOP_AFTER_LOAD (w);
+#endif
+
+ /* 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 */
+ if (WEXITSTATUS (w))
+ printf_filtered ("\nProgram exited with code 0%o.\n",
+ (unsigned int)WEXITSTATUS (w));
else
- printf ("\nProgram exited normally.\n");
+ if (!batch_mode())
+ printf_filtered ("\nProgram exited normally.\n");
fflush (stdout);
- inferior_died ();
+ target_mourn_inferior ();
#ifdef NO_SINGLE_STEP
- one_stepped = 0; /* Clear single_step state since proc gone */
-#endif /* NO_SINGLE_STEP */
+ one_stepped = 0;
+#endif
stop_print_frame = 0;
break;
}
else if (!WIFSTOPPED (w))
{
- kill_inferior ();
+ char *signame;
+
stop_print_frame = 0;
stop_signal = WTERMSIG (w);
- terminal_ours_for_output ();
- printf ("\nProgram terminated with signal %d, %s\n",
- stop_signal,
- stop_signal < NSIG
- ? sys_siglist[stop_signal]
- : "(undocumented)");
- printf ("The inferior process no longer exists.\n");
+ target_terminal_ours (); /* Must do this before mourn anyway */
+ target_kill (); /* kill mourns as well */
+#ifdef PRINT_RANDOM_SIGNAL
+ printf_filtered ("\nProgram terminated: ");
+ PRINT_RANDOM_SIGNAL (stop_signal);
+#else
+ printf_filtered ("\nProgram terminated with signal ");
+ signame = strsigno (stop_signal);
+ if (signame == NULL)
+ printf_filtered ("%d", stop_signal);
+ else
+ /* Do we need to print the number in addition to the name? */
+ printf_filtered ("%s (%d)", signame, stop_signal);
+ printf_filtered (", %s\n", safe_strsignal (stop_signal));
+#endif
+ printf_filtered ("The program no longer exists.\n");
fflush (stdout);
#ifdef NO_SINGLE_STEP
- one_stepped = 0; /* Clear single_step state since proc gone */
-#endif /* 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 */
+
+/* If PC is pointing at a nullified instruction, then step beyond it so that
+ the user won't be confused when GDB appears to be ready to execute it. */
- fetch_inferior_registers ();
- stop_pc = read_pc ();
- set_current_frame ( create_new_frame (read_register (FP_REGNUM),
- read_pc ()));
-#ifdef CONVEX_PTRACE
- /* pop frame stored by user-mode trap, if present */
- if (stop_pc == BREAK_TRAP_ADDR)
+ if (INSTRUCTION_NULLIFIED)
{
- POP_FRAME;
- stop_pc = read_pc () - 2;
- write_register (PC_REGNUM, stop_pc);
-#ifdef NPC_REGNUM
- write_register (NPC_REGNUM, stop_pc + 4);
-#endif
- pc_changed = 0;
+ resume (1, 0);
+ continue;
}
- else if (stop_pc > STACK_END_ADDR)
- {
- POP_FRAME;
- stop_pc = read_pc ();
- }
-#endif /* CONVEX_PTRACE */
+
+ stop_pc = read_pc ();
+ set_current_frame ( create_new_frame (read_fp (),
+ read_pc ()));
+
stop_frame_address = FRAME_FP (get_current_frame ());
- stop_sp = read_register (SP_REGNUM);
- stop_func_start =
- get_pc_function_start (stop_pc) + FUNCTION_START_OFFSET;
+ stop_sp = read_sp ();
+ 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. */
+ find_pc_partial_function (stop_pc, &stop_func_name, &stop_func_start);
+ stop_func_start += FUNCTION_START_OFFSET;
another_trap = 0;
- stop_breakpoint = 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)
+ (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. */
-
+ 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
-#ifndef CONVEX_PTRACE
|| (breakpoints_inserted &&
(stop_signal == SIGILL
- || stop_signal == SIGEMT))
-#endif /* not CONVEX_PTRACE */
- || stop_after_attach)
+#ifdef SIGEMT
+ || stop_signal == SIGEMT
+#endif
+ ))
+ || stop_soon_quietly)
{
if (stop_signal == SIGTRAP && stop_after_trap)
{
stop_print_frame = 0;
break;
}
- if (stop_after_attach)
+ if (stop_soon_quietly)
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;
+ if just proceeded over a breakpoint.
+
+ However, if we are trying to proceed over a breakpoint
+ and end up in sigtramp, then step_resume_breakpoint
+ will be set and we should check whether we've hit the
+ step breakpoint. */
+ if (stop_signal == SIGTRAP && trap_expected
+ && step_resume_breakpoint == 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.
+ that lands 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))
+ if (prev_pc == stop_pc - DECR_PC_AFTER_BREAK
+ || !step_range_end
+ || step_resume_breakpoint != NULL
+ || handling_longjmp /* FIXME */)
#endif /* DECR_PC_AFTER_BREAK not zero */
{
- /* For condition exprs. */
- select_frame (get_current_frame (), 0);
- stop_breakpoint =
- breakpoint_stop_status (stop_pc, stop_frame_address);
+ stop_bpstat =
+ bpstat_stop_status (&stop_pc, stop_frame_address);
/* 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);
-#ifdef NPC_REGNUM
- write_register (NPC_REGNUM, stop_pc + 4);
-#endif
- 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)
- {
- stop_pc -= DECR_PC_AFTER_BREAK;
- write_register (PC_REGNUM, stop_pc);
- pc_changed = 0;
- }
}
}
if (stop_signal == SIGTRAP)
random_signal
- = !(stop_breakpoint || trap_expected
- || stop_step_resume_break
-#ifndef CONVEX_PTRACE
- || (stop_sp INNER_THAN stop_pc
- && stop_pc INNER_THAN stop_frame_address)
-#else
- || stop_pc == text_end - 2
-#endif
- || (step_range_end && !step_resume_break_address));
+ = !(bpstat_explains_signal (stop_bpstat)
+ || trap_expected
+ || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)
+ || (step_range_end && step_resume_breakpoint == NULL));
else
{
random_signal
- = !(stop_breakpoint
- || stop_step_resume_break
-#ifdef news800
- || (stop_sp INNER_THAN stop_pc
- && stop_pc INNER_THAN stop_frame_address)
-#endif
-
+ = !(bpstat_explains_signal (stop_bpstat)
+ /* End of a stack dummy. Some systems (e.g. Sony
+ news) give another signal besides SIGTRAP,
+ so check here as well as above. */
+ || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)
);
if (!random_signal)
stop_signal = SIGTRAP;
/* For the program's own signals, act according to
the signal handling tables. */
- if (random_signal
- && !(running_in_shell && stop_signal == SIGSEGV))
+ if (random_signal)
{
/* Signal not for debugging purposes. */
int printed = 0;
-
+
stopped_by_random_signal = 1;
-
+
if (stop_signal >= NSIG
|| signal_print[stop_signal])
{
+ char *signame;
printed = 1;
- terminal_ours_for_output ();
- printf ("\nProgram received signal %d, %s\n",
- stop_signal,
- stop_signal < NSIG
- ? sys_siglist[stop_signal]
- : "(undocumented)");
+ target_terminal_ours_for_output ();
+#ifdef PRINT_RANDOM_SIGNAL
+ PRINT_RANDOM_SIGNAL (stop_signal);
+#else
+ printf_filtered ("\nProgram received signal ");
+ signame = strsigno (stop_signal);
+ if (signame == NULL)
+ printf_filtered ("%d", stop_signal);
+ else
+ /* Do we need to print the number as well as the name? */
+ printf_filtered ("%s (%d)", signame, stop_signal);
+ printf_filtered (", %s\n", safe_strsignal (stop_signal));
+#endif /* PRINT_RANDOM_SIGNAL */
fflush (stdout);
}
if (stop_signal >= NSIG
/* If not going to stop, give terminal back
if we took it away. */
else if (printed)
- terminal_inferior ();
+ target_terminal_inferior ();
+
+ /* Clear the signal if it should not be passed. */
+ if (signal_program[stop_signal] == 0)
+ stop_signal = 0;
+
+ /* I'm not sure whether this needs to be check_sigtramp2 or
+ whether it could/should be keep_going. */
+ goto check_sigtramp2;
}
/* Handle cases caused by hitting a breakpoint. */
+ {
+ CORE_ADDR jmp_buf_pc;
+ struct bpstat_what what;
+
+ what = bpstat_what (stop_bpstat);
+
+ switch (what.main_action)
+ {
+ case BPSTAT_WHAT_SET_LONGJMP_RESUME:
+ /* If we hit the breakpoint at longjmp, disable it for the
+ duration of this command. Then, install a temporary
+ breakpoint at the target of the jmp_buf. */
+ disable_longjmp_breakpoint();
+ remove_breakpoints ();
+ breakpoints_inserted = 0;
+ if (!GET_LONGJMP_TARGET(&jmp_buf_pc)) goto keep_going;
+
+ /* Need to blow away step-resume breakpoint, as it
+ interferes with us */
+ if (step_resume_breakpoint != NULL)
+ {
+ delete_breakpoint (step_resume_breakpoint);
+ step_resume_breakpoint = NULL;
+ what.step_resume = 0;
+ }
- if (!random_signal
- && (stop_breakpoint || stop_step_resume_break))
- {
- /* Does a breakpoint want us to stop? */
- if (stop_breakpoint && stop_breakpoint != -1
- && stop_breakpoint != -0x1000001)
- {
- /* 0x1000000 is set in stop_breakpoint as returned by
- breakpoint_stop_status to indicate a silent
- breakpoint. */
- if ((stop_breakpoint > 0 ? stop_breakpoint :
- -stop_breakpoint)
- & 0x1000000)
- {
- stop_print_frame = 0;
- if (stop_breakpoint > 0)
- stop_breakpoint -= 0x1000000;
- else
- stop_breakpoint += 0x1000000;
- }
- 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
#if 0
-#ifndef HAVE_REGISTER_WINDOWS
- && step_resume_break_sp INNER_THAN stop_sp
-#endif
-#endif
- )))
- {
- remove_step_breakpoint ();
- step_resume_break_address = 0;
- }
- /* Otherwise, must remove breakpoints and single-step
- to get us past the one we hit. */
- else
- {
+ /* FIXME - Need to implement nested temporary breakpoints */
+ if (step_over_calls > 0)
+ set_longjmp_resume_breakpoint(jmp_buf_pc,
+ get_current_frame());
+ else
+#endif /* 0 */
+ set_longjmp_resume_breakpoint(jmp_buf_pc, NULL);
+ handling_longjmp = 1; /* FIXME */
+ goto keep_going;
+
+ case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
+ case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE:
+ remove_breakpoints ();
+ breakpoints_inserted = 0;
+#if 0
+ /* FIXME - Need to implement nested temporary breakpoints */
+ if (step_over_calls
+ && (stop_frame_address
+ INNER_THAN step_frame_address))
+ {
+ another_trap = 1;
+ goto keep_going;
+ }
+#endif /* 0 */
+ disable_longjmp_breakpoint();
+ handling_longjmp = 0; /* FIXME */
+ if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME)
+ break;
+ /* else fallthrough */
+
+ case BPSTAT_WHAT_SINGLE:
+ if (breakpoints_inserted)
remove_breakpoints ();
- remove_step_breakpoint ();
- breakpoints_inserted = 0;
+ breakpoints_inserted = 0;
+ another_trap = 1;
+ /* Still need to check other stuff, at least the case
+ where we are stepping and step out of the right range. */
+ break;
+
+ case BPSTAT_WHAT_STOP_NOISY:
+ stop_print_frame = 1;
+ /* We are about to nuke the step_resume_breakpoint via the
+ cleanup chain, so no need to worry about it here. */
+ goto stop_stepping;
+
+ case BPSTAT_WHAT_STOP_SILENT:
+ stop_print_frame = 0;
+ /* We are about to nuke the step_resume_breakpoint via the
+ cleanup chain, so no need to worry about it here. */
+ goto stop_stepping;
+
+ case BPSTAT_WHAT_KEEP_CHECKING:
+ break;
+ }
+
+ if (what.step_resume)
+ {
+ delete_breakpoint (step_resume_breakpoint);
+ step_resume_breakpoint = NULL;
+
+ /* If were waiting for a trap, hitting the step_resume_break
+ doesn't count as getting it. */
+ if (trap_expected)
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. */
- }
+ /* 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. */
-#ifndef CONVEX_PTRACE
- if (stop_sp INNER_THAN stop_pc
- && stop_pc INNER_THAN stop_frame_address)
-#else
- /* "stack" dummy must be in text segment for Convex Unix */
- if (stop_pc == text_end - 2)
+ if (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
- {
- stop_print_frame = 0;
- stop_stack_dummy = 1;
-#ifdef HP9K320
- trap_expected_after_continue = 1;
-#endif
- break;
- }
-
- if (step_resume_break_address)
+ break;
+ }
+
+ if (step_resume_breakpoint)
/* Having a step-resume breakpoint overrides anything
else having to do with stepping commands until
that breakpoint is reached. */
- ;
+ /* I suspect this could/should be keep_going, because if the
+ check_sigtramp2 check succeeds, then it will put in another
+ step_resume_breakpoint, and we aren't (yet) prepared to nest
+ them. */
+ goto check_sigtramp2;
+
+ if (step_range_end == 0)
+ /* Likewise if we aren't even stepping. */
+ /* I'm not sure whether this needs to be check_sigtramp2 or
+ whether it could/should be keep_going. */
+ goto check_sigtramp2;
+
/* 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 != prev_sp
- || stop_frame_address != step_frame_address)))
+ if (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)))
{
- /* 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;
- }
+ /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
+ So definately need to check for sigtramp here. */
+ goto check_sigtramp2;
}
/* 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)
+
+ /* Did we just take a signal? */
+ if (IN_SIGTRAMP (stop_pc, stop_func_name)
+ && !IN_SIGTRAMP (prev_pc, prev_func_name))
{
- if (stop_func_start)
- {
- prologue_pc = stop_func_start;
- SKIP_PROLOGUE (prologue_pc);
- }
+ /* 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. */
+ {
+ struct symtab_and_line sr_sal;
+
+ sr_sal.pc = prev_pc;
+ sr_sal.symtab = NULL;
+ sr_sal.line = 0;
+ step_resume_breakpoint =
+ set_momentary_breakpoint (sr_sal, get_current_frame (),
+ bp_step_resume);
+ if (breakpoints_inserted)
+ insert_breakpoints ();
+ }
+
+ /* If this is stepi or nexti, make sure that the stepping range
+ gets us past that instruction. */
+ if (step_range_end == 1)
+ /* FIXME: Does this run afoul of the code below which, if
+ we step into the middle of a line, resets the stepping
+ range? */
+ step_range_end = (step_range_start = prev_pc) + 1;
+
+ remove_breakpoints_on_following_step = 1;
+ goto keep_going;
+ }
+
+ if (stop_func_start)
+ {
+ /* Do this after the IN_SIGTRAMP check; it might give
+ an error. */
+ prologue_pc = stop_func_start;
+ SKIP_PROLOGUE (prologue_pc);
+ }
+
+ /* ==> See comments at top of file on this algorithm. <==*/
- /* ==> See comments at top of file on this algorithm. <==*/
+ if ((stop_pc == stop_func_start
+ || IN_SOLIB_TRAMPOLINE (stop_pc, stop_func_name))
+ && (stop_func_start != prev_func_start
+ || prologue_pc != stop_func_start
+ || stop_sp != prev_sp))
+ {
+ /* It's a subroutine call. */
- if (stop_pc == stop_func_start
- && (stop_func_start != prev_func_start
- || prologue_pc != stop_func_start
- || stop_sp != prev_sp))
+ if (step_over_calls == 0)
{
- newfun = find_pc_function (stop_pc);
- /* It's a subroutine call */
- if (step_over_calls > 0 || (step_over_calls && newfun == 0))
- {
- /* A subroutine call has happened. */
- /* Set a special breakpoint after the return */
- step_resume_break_address =
- SAVED_PC_AFTER_CALL (get_current_frame ());
- step_resume_break_duplicate
- = breakpoint_here_p (step_resume_break_address);
- step_resume_break_sp = stop_sp;
- if (breakpoints_inserted)
- insert_step_breakpoint ();
- }
- /* Subroutine call with source code we should not step over.
- Do step to the first line of code in it. */
- else if (step_over_calls)
- {
- 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. */
-#ifdef convex
- /* no, don't either. It skips any code that's
- legitimately on the first line. */
+ /* I presume that step_over_calls is only 0 when we're
+ supposed to be stepping at the assembly language level
+ ("stepi"). Just stop. */
+ stop_step = 1;
+ break;
+ }
+
+ if (step_over_calls > 0)
+ /* We're doing a "next". */
+ goto step_over_function;
+
+ /* If we are in a function call trampoline (a stub between
+ the calling routine and the real function), locate the real
+ function. That's what tells us (a) whether we want to step
+ into it at all, and (b) what prologue we want to run to
+ the end of, if we do step into it. */
+ tmp = SKIP_TRAMPOLINE_CODE (stop_pc);
+ if (tmp != 0)
+ stop_func_start = tmp;
+
+ /* If we have line number information for the function we
+ are thinking of stepping into, step into it.
+
+ If there are several symtabs at that PC (e.g. with include
+ files), just want to know whether *any* of them have line
+ numbers. find_pc_line handles this. */
+ {
+ struct symtab_and_line tmp_sal;
+
+ tmp_sal = find_pc_line (stop_func_start, 0);
+ if (tmp_sal.line != 0)
+ goto step_into_function;
+ }
+
+step_over_function:
+ /* A subroutine call has happened. */
+ {
+ /* Set a special breakpoint after the return */
+ struct symtab_and_line sr_sal;
+ sr_sal.pc =
+ ADDR_BITS_REMOVE
+ (SAVED_PC_AFTER_CALL (get_current_frame ()));
+ sr_sal.symtab = NULL;
+ sr_sal.line = 0;
+ step_resume_breakpoint =
+ set_momentary_breakpoint (sr_sal, get_current_frame (),
+ bp_step_resume);
+ if (breakpoints_inserted)
+ insert_breakpoints ();
+ }
+ goto keep_going;
+
+step_into_function:
+ /* Subroutine call with source code we should not step over.
+ Do step to the first line of code in it. */
+ 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. */
+#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;
+ 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
- /* Put the step-breakpoint there and go until there. */
- {
- step_resume_break_address = stop_func_start;
- step_resume_break_sp = stop_sp;
-
- 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;
- }
- }
- 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 subroutince call; stop now. */
- else
+
+ if (stop_func_start == stop_pc)
{
+ /* We are already there: stop now. */
stop_step = 1;
break;
}
+ else
+ /* Put the step-breakpoint there and go until there. */
+ {
+ struct symtab_and_line sr_sal;
+
+ sr_sal.pc = stop_func_start;
+ sr_sal.symtab = NULL;
+ sr_sal.line = 0;
+ /* 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_resume_breakpoint =
+ set_momentary_breakpoint (sr_sal, (CORE_ADDR)0,
+ bp_step_resume);
+ if (breakpoints_inserted)
+ insert_breakpoints ();
+
+ /* And make sure stepping stops right away then. */
+ step_range_end = step_range_start;
+ }
+ goto keep_going;
+ }
+
+ /* We've wandered out of the step range (but haven't done a
+ subroutine call or return). (Is that true? I think we get
+ here if we did a return and maybe a longjmp). */
+
+ sal = find_pc_line(stop_pc, 0);
+
+ if (step_range_end == 1)
+ {
+ /* It is stepi or nexti. We always want to stop stepping after
+ one instruction. */
+ stop_step = 1;
+ break;
+ }
+
+ if (sal.line == 0)
+ {
+ /* We have no line number information. That means to stop
+ stepping (does this always happen right after one instruction,
+ when we do "s" in a function with no line numbers,
+ or can this happen as a result of a return or longjmp?). */
+ stop_step = 1;
+ break;
+ }
+
+ if (stop_pc == sal.pc && current_line != sal.line)
+ {
+ /* We are at the start of a different line. So stop. Note that
+ we don't stop if we step into the middle of a different line.
+ That is said to make things like for (;;) statements work
+ better. */
+ stop_step = 1;
+ break;
+ }
+
+ /* We aren't done stepping.
+
+ Optimize by setting the stepping range to the line.
+ (We might not be in the original line, but if we entered a
+ new line in mid-statement, we continue stepping. This makes
+ things like for(;;) statements work better.) */
+ step_range_start = sal.pc;
+ step_range_end = sal.end;
+ goto keep_going;
+
+ check_sigtramp2:
+ 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. FIXME: This should
+ be more enduring than a step_resume breakpoint; we should know
+ that we will later need to keep going rather than re-hitting
+ the breakpoint here (see testsuite/gdb.t06/signals.exp where
+ it says "exceedingly difficult"). */
+ struct symtab_and_line sr_sal;
+
+ sr_sal.pc = prev_pc;
+ sr_sal.symtab = NULL;
+ sr_sal.line = 0;
+ step_resume_breakpoint =
+ set_momentary_breakpoint (sr_sal, get_current_frame (),
+ bp_step_resume);
+ if (breakpoints_inserted)
+ insert_breakpoints ();
+
+ remove_breakpoints_on_following_step = 1;
+ another_trap = 1;
}
+ keep_going:
+ /* Come to this label when you need to resume the inferior.
+ It's really much cleaner to do a goto than a maze of if-else
+ conditions. */
+
/* 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
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_breakpoint == NULL)
+ || (trap_expected && step_resume_breakpoint == NULL)
+ || 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. */
+ if (step_resume_breakpoint == NULL &&
+ remove_breakpoints_on_following_step)
+ {
+ remove_breakpoints_on_following_step = 0;
+ remove_breakpoints ();
+ breakpoints_inserted = 0;
+ }
+ else if (!breakpoints_inserted &&
+ (step_resume_breakpoint != NULL || !another_trap))
{
- insert_step_breakpoint ();
breakpoints_failed = insert_breakpoints ();
if (breakpoints_failed)
break;
if (stop_signal == SIGTRAP)
stop_signal = 0;
- resume ((step_range_end && !step_resume_break_address)
- || trap_expected,
+#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_resume_breakpoint == NULL
+ && !handling_longjmp
+ && (step_range_end
+ || trap_expected))
+ || bpstat_should_step (),
stop_signal);
}
}
+
+ stop_stepping:
+ 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;
+ }
+ do_cleanups (old_cleanups);
}
\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. */
-/* FIXME, normal_stop is ALWAYS called immediately after wait_for_inferior.
- They should probably be merged into a single function, since that
- would avoid numerous tests (e.g. of inferior_pid). */
-
-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 (inferior_pid)
+ 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\
+ printf_filtered ("Stopped; cannot insert breakpoints.\n\
The same program may be running in another process.\n");
}
- if (inferior_pid)
- remove_step_breakpoint ();
-
- if (inferior_pid && breakpoints_inserted)
+ if (target_has_execution && breakpoints_inserted)
if (remove_breakpoints ())
{
- terminal_ours_for_output ();
- printf ("Cannot remove breakpoints because program is no longer writable.\n\
-It must be running in another process.\n\
+ target_terminal_ours_for_output ();
+ printf_filtered ("Cannot remove breakpoints because program is no longer writable.\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)
- delete_current_display ();
+ disable_current_display ();
if (step_multi && stop_step)
return;
- terminal_ours ();
+ target_terminal_ours ();
- if (running_in_shell)
- {
- if (stop_signal == SIGSEGV)
- {
- char *exec_file = (char *) get_exec_file (1);
+ /* Look up the hook_stop and run it if it exists. */
- if (access (exec_file, X_OK) != 0)
- printf ("The file \"%s\" is not executable.\n", exec_file);
- else
- 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 (stop_command->hook)
+ {
+ catch_errors (hook_stop_stub, (char *)stop_command->hook,
+ "Error while running hook_stop:\n", RETURN_MASK_ALL);
}
- 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 (get_current_frame (), 0);
if (stop_print_frame)
{
- if (stop_breakpoint > 0)
- printf ("\nBpt %d, ", stop_breakpoint);
- print_sel_frame (stop_step
- && step_frame_address == stop_frame_address
- && 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)
{
select_frame (get_current_frame (), 0);
}
}
+
+static int
+hook_stop_stub (cmd)
+ char *cmd;
+{
+ execute_user_command ((struct cmd_list_element *)cmd, 0);
+ return (0);
+}
\f
+int signal_stop_state (signo)
+ int signo;
+{
+ return ((signo >= 0 && signo < NSIG) ? signal_stop[signo] : 0);
+}
+
+int signal_print_state (signo)
+ int signo;
+{
+ return ((signo >= 0 && signo < NSIG) ? signal_print[signo] : 0);
+}
+
+int signal_pass_state (signo)
+ int signo;
+{
+ return ((signo >= 0 && signo < NSIG) ? signal_program[signo] : 0);
+}
+
static void
-insert_step_breakpoint ()
+sig_print_header ()
{
- 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);
- }
+ printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n");
}
static void
-remove_step_breakpoint ()
+sig_print_info (number)
+ int number;
{
- if (step_resume_break_address && !step_resume_break_duplicate)
- write_memory (step_resume_break_address, step_resume_break_shadow,
- sizeof break_insn);
+ char *name;
+
+ if ((name = strsigno (number)) == NULL)
+ printf_filtered ("%d\t\t", number);
+ else
+ printf_filtered ("%s (%d)\t", name, 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", safe_strsignal (number));
}
-\f
+
/* Specify how various signals in the inferior should be handled. */
static void
char *args;
int from_tty;
{
- register char *p = args;
- int signum = 0;
- register int digits, wordlen;
+ char **argv;
+ int digits, wordlen;
+ int sigfirst, signum, siglast;
+ int allsigs;
+ int nsigs;
+ unsigned char *sigs;
+ struct cleanup *old_chain;
+
+ if (args == NULL)
+ {
+ error_no_arg ("signal to handle");
+ }
+
+ /* Allocate and zero an array of flags for which signals to handle. */
+
+ nsigs = signo_max () + 1;
+ sigs = (unsigned char *) alloca (nsigs);
+ memset (sigs, 0, nsigs);
- if (!args)
- error_no_arg ("signal to handle");
+ /* Break the command line up into args. */
- while (*p)
+ argv = buildargv (args);
+ if (argv == NULL)
{
- /* Find the end of the next word in the args. */
- for (wordlen = 0; p[wordlen] && p[wordlen] != ' ' && p[wordlen] != '\t';
- wordlen++);
- for (digits = 0; p[digits] >= '0' && p[digits] <= '9'; digits++);
+ nomem (0);
+ }
+ old_chain = make_cleanup (freeargv, (char *) argv);
+
+ /* Walk through the args, looking for signal numbers, signal names, and
+ actions. Signal numbers and signal names may be interspersed with
+ actions, with the actions being performed for all signals cumulatively
+ specified. Signal ranges can be specified as <LOW>-<HIGH>. */
- /* If it is all digits, it is signal number to operate on. */
- if (digits == wordlen)
+ while (*argv != NULL)
+ {
+ wordlen = strlen (*argv);
+ for (digits = 0; isdigit ((*argv)[digits]); digits++) {;}
+ allsigs = 0;
+ sigfirst = siglast = -1;
+
+ if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
{
- signum = atoi (p);
- if (signum <= 0 || signum >= NSIG)
+ /* Apply action to all signals except those used by the
+ debugger. Silently skip those. */
+ allsigs = 1;
+ sigfirst = 0;
+ siglast = nsigs - 1;
+ }
+ else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen))
+ {
+ SET_SIGS (nsigs, sigs, signal_stop);
+ SET_SIGS (nsigs, sigs, signal_print);
+ }
+ else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen))
+ {
+ UNSET_SIGS (nsigs, sigs, signal_program);
+ }
+ else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen))
+ {
+ SET_SIGS (nsigs, sigs, signal_print);
+ }
+ else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen))
+ {
+ SET_SIGS (nsigs, sigs, signal_program);
+ }
+ else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen))
+ {
+ UNSET_SIGS (nsigs, sigs, signal_stop);
+ }
+ else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen))
+ {
+ SET_SIGS (nsigs, sigs, signal_program);
+ }
+ else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen))
+ {
+ UNSET_SIGS (nsigs, sigs, signal_print);
+ UNSET_SIGS (nsigs, sigs, signal_stop);
+ }
+ else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen))
+ {
+ UNSET_SIGS (nsigs, sigs, signal_program);
+ }
+ else if (digits > 0)
+ {
+ sigfirst = siglast = atoi (*argv);
+ if ((*argv)[digits] == '-')
+ {
+ siglast = atoi ((*argv) + digits + 1);
+ }
+ if (sigfirst > siglast)
+ {
+ /* Bet he didn't figure we'd think of this case... */
+ signum = sigfirst;
+ sigfirst = siglast;
+ siglast = signum;
+ }
+ if (sigfirst < 0 || sigfirst >= nsigs)
{
- p[wordlen] = '\0';
- error ("Invalid signal %s given as argument to \"handle\".", p);
+ error ("Signal %d not in range 0-%d", sigfirst, nsigs - 1);
}
- if (signum == SIGTRAP || signum == SIGINT)
+ if (siglast < 0 || siglast >= nsigs)
{
- if (!query ("Signal %d is used by the debugger.\nAre you sure you want to change it? ", signum))
- error ("Not confirmed.");
+ error ("Signal %d not in range 0-%d", siglast, nsigs - 1);
}
}
- 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))
+ else if ((signum = strtosigno (*argv)) != 0)
{
- signal_stop[signum] = 1;
- signal_print[signum] = 1;
+ sigfirst = siglast = signum;
}
- else if (wordlen >= 2 && !strncmp (p, "print", wordlen))
- signal_print[signum] = 1;
- else if (wordlen >= 2 && !strncmp (p, "pass", wordlen))
- signal_program[signum] = 1;
- else if (!strncmp (p, "ignore", wordlen))
- signal_program[signum] = 0;
- else if (wordlen >= 3 && !strncmp (p, "nostop", wordlen))
- signal_stop[signum] = 0;
- else if (wordlen >= 4 && !strncmp (p, "noprint", wordlen))
+ else
{
- signal_print[signum] = 0;
- signal_stop[signum] = 0;
+ /* Not a number and not a recognized flag word => complain. */
+ error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
}
- else if (wordlen >= 4 && !strncmp (p, "nopass", wordlen))
- signal_program[signum] = 0;
- else if (wordlen >= 3 && !strncmp (p, "noignore", wordlen))
- signal_program[signum] = 1;
- /* Not a number and not a recognized flag word => complain. */
- else
+
+ /* If any signal numbers or symbol names were found, set flags for
+ which signals to apply actions to. */
+
+ for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
{
- p[wordlen] = 0;
- error ("Unrecognized flag word: \"%s\".", p);
+ switch (signum)
+ {
+ case SIGTRAP:
+ case SIGINT:
+ if (!allsigs && !sigs[signum])
+ {
+ if (query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum)))
+ {
+ sigs[signum] = 1;
+ }
+ else
+ {
+ printf ("Not confirmed, unchanged.\n");
+ fflush (stdout);
+ }
+ }
+ break;
+ default:
+ sigs[signum] = 1;
+ break;
+ }
}
- /* Find start of next word. */
- p += wordlen;
- while (*p == ' ' || *p == '\t') p++;
+ argv++;
}
+ target_notice_signals();
+
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 ();
+ for (signum = 0; signum < nsigs; signum++)
+ {
+ if (sigs[signum])
+ {
+ sig_print_info (signum);
+ }
+ }
}
+
+ do_cleanups (old_chain);
}
/* Print current contents of the tables set by the handle command. */
static void
-signals_info (signum_exp)
+signals_info (signum_exp, from_tty)
char *signum_exp;
+ int from_tty;
{
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 = strtosigno (signum_exp);
+ if (i == 0)
+ {
+ /* 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)
- {
- printf ("[Type Return to see more]");
- fflush (stdout);
- gdb_read_line (0, 0);
- }
- 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]);
+
+ sig_print_info (i);
}
- printf ("\nUse the \"handle\" command to change these tables.\n");
+ 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). */
-struct command_line *get_breakpoint_commands ();
-
void
save_inferior_status (inf_status, restore_stack_info)
struct inferior_status *inf_status;
inf_status->stop_signal = stop_signal;
inf_status->stop_pc = stop_pc;
inf_status->stop_frame_address = stop_frame_address;
- inf_status->stop_breakpoint = stop_breakpoint;
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->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_after_attach = stop_after_attach;
- inf_status->breakpoint_commands = get_breakpoint_commands ();
+ 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);
+ memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES);
record_selected_frame (&(inf_status->selected_frame_address),
&(inf_status->selected_level));
stop_signal = inf_status->stop_signal;
stop_pc = inf_status->stop_pc;
stop_frame_address = inf_status->stop_frame_address;
- stop_breakpoint = inf_status->stop_breakpoint;
stop_step = inf_status->stop_step;
stop_stack_dummy = inf_status->stop_stack_dummy;
stopped_by_random_signal = inf_status->stopped_by_random_signal;
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_after_attach = inf_status->stop_after_attach;
- set_breakpoint_commands (inf_status->breakpoint_commands);
+ 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);
+ memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES);
- if (inf_status->restore_stack_info)
+ /* 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 (FRAME_FP (fid) != inf_status->selected_frame_address ||
+
+ /* 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)
{
+#if 1
+ /* 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;
}
select_frame (fid, inf_status->selected_level);
}
- return;
}
\f
_initialize_infrun ()
{
register int i;
+ register int numsigs;
add_info ("signals", signals_info,
"What debugger does when program gets various signals.\n\
Specify a signal number as argument to print info on that signal only.");
+ add_info_alias ("handle", "signals", 0);
add_com ("handle", class_run, handle_command,
"Specify how to handle a signal.\n\
-Args are signal number followed by flags.\n\
-Flags allowed are \"stop\", \"print\", \"pass\",\n\
- \"nostop\", \"noprint\" or \"nopass\".\n\
-Print means print a message if this signal happens.\n\
+Args are signal numbers and actions to apply to those signals.\n\
+Signal numbers may be numeric (ex. 11) or symbolic (ex. SIGSEGV).\n\
+Numeric ranges may be specified with the form LOW-HIGH (ex. 14-21).\n\
+The special arg \"all\" is recognized to mean all signals except those\n\
+used by the debugger, typically SIGTRAP and SIGINT.\n\
+Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
+\"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
Stop means reenter debugger if this signal happens (implies print).\n\
+Print means print a message if this signal happens.\n\
Pass means let program see this signal; otherwise program doesn't know.\n\
+Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
Pass and Stop may be combined.");
- for (i = 0; i < NSIG; i++)
+ stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command,
+ "There is no `stop' command, but you can set a hook on `stop'.\n\
+This allows you to set a list of commands to be run each time execution\n\
+of the program stops.", &cmdlist);
+
+ numsigs = signo_max () + 1;
+ signal_stop = (unsigned char *)
+ xmalloc (sizeof (signal_stop[0]) * numsigs);
+ signal_print = (unsigned char *)
+ xmalloc (sizeof (signal_print[0]) * numsigs);
+ signal_program = (unsigned char *)
+ xmalloc (sizeof (signal_program[0]) * numsigs);
+ for (i = 0; i < numsigs; i++)
{
signal_stop[i] = 1;
signal_print[i] = 1;
signal_print[SIGURG] = 0;
#endif /* SIGURG */
}
-
projects / deliverable / binutils-gdb.git / blobdiff