-/* 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
+ 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 starts 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.
+ 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.
+
+ 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.
*/
#include "defs.h"
-#include "initialize.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>
-#include <a.out.h>
+
+/* unistd.h is needed to #define X_OK */
+#ifdef USG
+#include <unistd.h>
+#else
#include <sys/file.h>
+#endif
-#ifdef UMAX_PTRACE
-#include <sys/param.h>
-#include <sys/ptrace.h>
-#endif UMAX_PTRACE
+/* Prototypes for local functions */
-extern char *sys_siglist[];
-extern int errno;
+static void
+signals_info PARAMS ((char *, int));
-/* Tables of how to react to signals; the user sets them. */
+static void
+handle_command PARAMS ((char *, int));
-static char signal_stop[NSIG];
-static char signal_print[NSIG];
-static char signal_program[NSIG];
+static void
+sig_print_info PARAMS ((int));
-/* Nonzero if breakpoints are now inserted in the inferior. */
+static void
+sig_print_header PARAMS ((void));
-static int breakpoints_inserted;
+static void
+resume_cleanups PARAMS ((int));
-/* Function inferior was in as of last step command. */
+static int
+hook_stop_stub PARAMS ((char *));
-static struct symbol *step_start_function;
+/* 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
+
+
+/* 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
+
+/* 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
+
+/* 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. */
+
+#ifndef INSTRUCTION_NULLIFIED
+#define INSTRUCTION_NULLIFIED 0
+#endif
+
+/* Tables of how to react to signals; the user sets them. */
+
+static unsigned char *signal_stop;
+static unsigned char *signal_print;
+static unsigned char *signal_program;
-/* This is the sequence of bytes we insert for a breakpoint. */
+#define SET_SIGS(nsigs,sigs,flags) \
+ do { \
+ int signum = (nsigs); \
+ while (signum-- > 0) \
+ if ((sigs)[signum]) \
+ (flags)[signum] = 1; \
+ } while (0)
-static char break_insn[] = BREAKPOINT;
+#define UNSET_SIGS(nsigs,sigs,flags) \
+ do { \
+ int signum = (nsigs); \
+ while (signum-- > 0) \
+ if ((sigs)[signum]) \
+ (flags)[signum] = 0; \
+ } while (0)
-/* Nonzero => address for special breakpoint for resuming stepping. */
-static CORE_ADDR step_resume_break_address;
+/* Command list pointer for the "stop" placeholder. */
-/* Original contents of the byte where the special breakpoint is. */
+static struct cmd_list_element *stop_command;
-static char step_resume_break_shadow[sizeof break_insn];
+/* Nonzero if breakpoints are now inserted in the inferior. */
+
+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;
/* Nonzero means expecting a trace trap
and should stop the inferior and return silently when it happens. */
-static int stop_after_trap;
-
-/* Nonzero means expecting a trace trap due to attaching to a process. */
+int stop_after_trap;
-static int stop_after_attach;
+/* 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?). */
-/* Nonzero if pc has been changed by the debugger
- since the inferior stopped. */
+int stop_soon_quietly;
-int pc_changed;
+/* Nonzero if proceed is being used for a "finish" command or a similar
+ situation when stop_registers should be saved. */
-/* Nonzero if debugging a remote machine via a serial link or ethernet. */
+int proceed_to_finish;
-int remote_debugging;
-
-/* 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;
-static void insert_step_breakpoint ();
-static void remove_step_breakpoint ();
-static void wait_for_inferior ();
-static void normal_stop ();
+#ifdef NO_SINGLE_STEP
+extern int one_stepped; /* From machine dependent code */
+extern void single_step (); /* Same. */
+#endif /* NO_SINGLE_STEP */
+
+\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 CANNOT_STEP_BREAKPOINT
+ /* Most targets can step a breakpoint instruction, thus executing it
+ normally. But if this one cannot, just continue and we will hit
+ it anyway. */
+ if (step && breakpoints_inserted && breakpoint_here_p (read_pc ()))
+ step = 0;
+#endif
+
+#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 (inferior_pid, 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 ()))
+ if (breakpoint_here_p (read_pc ()))
oneproc = 1;
}
else
- write_register (PC_REGNUM, addr);
+ 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. */
-
-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. */
-
-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. */
- trap_expected = 2;
- 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 (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);
- }
- 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;
- mark_breakpoints_out ();
- terminal_init_inferior ();
- clear_proceed_status ();
- stop_after_attach = 1;
- /*proceed (-1, 0, -2);*/
- wait_for_inferior ();
- normal_stop ();
+ trap_expected_after_continue = 0;
+ breakpoints_inserted = 0;
+ breakpoint_init_inferior ();
+ 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;
- int stop_step_resume_break;
- int newmisc;
- int newfun_pc;
- struct symbol *newfun;
+ CORE_ADDR stop_sp = 0;
+ CORE_ADDR stop_func_start;
+ char *stop_func_name;
+ CORE_ADDR prologue_pc = 0, tmp;
struct symtab_and_line sal;
- int prev_pc;
-
- prev_pc = read_pc ();
+ int remove_breakpoints_on_following_step = 0;
+ int current_line;
+ int handling_longjmp = 0; /* FIXME */
+ struct breakpoint *step_resume_breakpoint = NULL;
+ int pid;
+
+ old_cleanups = make_cleanup (delete_breakpoint_current_contents,
+ &step_resume_breakpoint);
+ sal = find_pc_line(prev_pc, 0);
+ current_line = sal.line;
+
+ /* Are we stepping? */
+#define CURRENTLY_STEPPING() ((step_resume_breakpoint == NULL \
+ && !handling_longjmp \
+ && (step_range_end \
+ || trap_expected)) \
+ || bpstat_should_step ())
while (1)
{
- if (remote_debugging)
- remote_wait (&w);
- else
- {
- pid = wait (&w);
- if (pid != inferior_pid)
- continue;
- }
+ /* Clean up saved state that will become invalid. */
+ flush_cached_frames ();
+ registers_changed ();
- 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;
+ pid = target_wait (&w);
- /* 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. */
+#ifdef SIGTRAP_STOP_AFTER_LOAD
+
+ /* 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;
+#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;
+#endif
break;
}
- else
+
+ if (pid != inferior_pid)
{
- 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)
+ int printed = 0;
+
+ if (!in_thread_list (pid))
{
- 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. */
-#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))
-#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)
- {
- stop_pc -= DECR_PC_AFTER_BREAK;
- write_register (PC_REGNUM, stop_pc);
- pc_changed = 0;
- }
- }
+ fprintf (stderr, "[New %s]\n", target_pid_to_str (pid));
+ add_thread (pid);
- 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;
- }
+ target_resume (pid, 0, 0);
+ continue;
}
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;
+ stop_signal = WSTOPSIG (w);
- if (stop_signal >= NSIG
- || signal_print[stop_signal])
+ 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 ();
+ printf_filtered ("\nProgram received signal ");
+ signame = strsigno (stop_signal);
+ if (signame == NULL)
+ printf_filtered ("%d", stop_signal);
+ else
+ printf_filtered ("%s (%d)", signame, stop_signal);
+ printf_filtered (", %s\n", safe_strsignal (stop_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)
- terminal_inferior ();
- }
-
- /* Handle cases caused by hitting a breakpoint. */
- if (!random_signal
- && (stop_breakpoint || stop_step_resume_break))
- {
- /* Does a breakpoint want us to stop? */
- if (stop_breakpoint && stop_breakpoint != -1)
+ if (stop_signal >= NSIG || signal_stop[stop_signal])
{
- /* 0x1000000 is set in stop_breakpoint as returned by
- breakpoint_status_p to indicate a silent breakpoint. */
- if (stop_breakpoint > 0 && stop_breakpoint & 0x1000000)
+ inferior_pid = pid;
+ printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid));
+
+ flush_cached_frames ();
+ registers_changed ();
+ trap_expected = 0;
+ if (step_resume_breakpoint)
{
- stop_breakpoint &= ~0x1000000;
- stop_print_frame = 0;
+ delete_breakpoint (step_resume_breakpoint);
+ step_resume_breakpoint = NULL;
}
- 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;
+ prev_pc = 0;
+ prev_sp = 0;
+ prev_func_name = NULL;
+ step_range_start = 0;
+ step_range_end = 0;
+ step_frame_address = 0;
+ handling_longjmp = 0;
+ another_trap = 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;
- }
+ if (printed)
+ target_terminal_inferior ();
+
+ /* Clear the signal if it should not be passed. */
+ if (signal_program[stop_signal] == 0)
+ stop_signal = 0;
- /* 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. */
+ target_resume (pid, 0, stop_signal);
+ continue;
+ }
}
+ }
+
+#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. */
- /* 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 (INSTRUCTION_NULLIFIED)
+ {
+ resume (1, 0);
+ continue;
+ }
+
+ stop_pc = read_pc ();
+ set_current_frame ( create_new_frame (read_fp (), stop_pc));
+
+ stop_frame_address = FRAME_FP (get_current_frame ());
+ 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,
+ (CORE_ADDR *)NULL);
+ stop_func_start += FUNCTION_START_OFFSET;
+ another_trap = 0;
+ bpstat_clear (&stop_bpstat);
+ stop_step = 0;
+ stop_stack_dummy = 0;
+ stop_print_frame = 1;
+ 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
+#ifdef SIGEMT
+ || stop_signal == SIGEMT
+#endif
+ ))
+ || stop_soon_quietly)
+ {
+ if (stop_signal == SIGTRAP && stop_after_trap)
{
stop_print_frame = 0;
- stop_stack_dummy = 1;
-#ifdef HP9K320
- trap_expected_after_continue = 1;
-#endif
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_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. */
+ stop_bpstat = bpstat_stop_status
+ (&stop_pc, stop_frame_address,
+#if DECR_PC_AFTER_BREAK
+ /* Notice the case of stepping through a jump
+ 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. */
+ (prev_pc != stop_pc - DECR_PC_AFTER_BREAK
+ && CURRENTLY_STEPPING ())
+#else /* DECR_PC_AFTER_BREAK zero */
+ 0
+#endif /* DECR_PC_AFTER_BREAK zero */
+ );
+ /* Following in case break condition called a
+ function. */
+ stop_print_frame = 1;
+ }
- 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)
+ if (stop_signal == SIGTRAP)
+ random_signal
+ = !(bpstat_explains_signal (stop_bpstat)
+ || trap_expected
+#ifndef CALL_DUMMY_BREAKPOINT_OFFSET
+ || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)
+#endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
+ || (step_range_end && step_resume_breakpoint == NULL));
+ else
{
- /* 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;
- }
+ random_signal
+ = !(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. */
+#ifndef CALL_DUMMY_BREAKPOINT_OFFSET
+ || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)
+#endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
+ );
+ if (!random_signal)
+ stop_signal = SIGTRAP;
}
+ }
+ else
+ random_signal = 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)
+ /* 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])
{
- newfun = find_pc_function (stop_pc);
- newmisc = -1;
- if (newfun)
- {
- newfun_pc = BLOCK_START (SYMBOL_BLOCK_VALUE (newfun))
- + FUNCTION_START_OFFSET;
- }
+ char *signame;
+ printed = 1;
+ 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
- {
- 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)))
- {
- /* 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_duplicate
- = breakpoint_here_p (step_resume_break_address);
- 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 (stop_pc == newfun_pc && step_over_calls)
- {
- SKIP_PROLOGUE (newfun_pc);
- sal = find_pc_line (newfun_pc, 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)
- newfun_pc = sal.end;
-
- if (newfun_pc == stop_pc)
- /* We are already there: stop now. */
- stop_step = 1;
- else
- /* Put the step-breakpoint there and go until there. */
- {
- 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;
- }
- }
- /* No subroutince call; stop now. */
- else
- {
- stop_step = 1;
- break;
- }
+ /* 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
+ || signal_stop[stop_signal])
+ break;
+ /* If not going to stop, give terminal back
+ if we took it away. */
+ else if (printed)
+ 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;
}
- /* Save the pc before execution, to compare with pc after stop. */
- prev_pc = read_pc ();
+ /* Handle cases caused by hitting a breakpoint. */
+ {
+ CORE_ADDR jmp_buf_pc;
+ struct bpstat_what what;
- /* If we did not do break;, it means we should keep
- running the inferior and not return to debugger. */
+ what = bpstat_what (stop_bpstat);
+
+ if (what.call_dummy)
+ {
+ stop_stack_dummy = 1;
+#ifdef HP_OS_BUG
+ trap_expected_after_continue = 1;
+#endif
+ }
+
+ 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 0
+ /* 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 ();
+ 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. */
+
+#ifndef CALL_DUMMY_BREAKPOINT_OFFSET
+ /* This is the old way of detecting the end of the stack dummy.
+ An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets
+ handled above. As soon as we can test it on all of them, all
+ architectures should define it. */
+
+ /* If this is the breakpoint at the end of a stack dummy,
+ just stop silently, unless the user was doing an si/ni, in which
+ case she'd better know what she's doing. */
+
+ if (PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)
+ && !step_range_end)
+ {
+ stop_print_frame = 0;
+ stop_stack_dummy = 1;
+#ifdef HP_OS_BUG
+ trap_expected_after_continue = 1;
+#endif
+ break;
+ }
+#endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
+
+ 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. */
+ 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)))
+ {
+ /* 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. */
+
+ /* Did we just take a signal? */
+ if (IN_SIGTRAMP (stop_pc, stop_func_name)
+ && !IN_SIGTRAMP (prev_pc, prev_func_name))
+ {
+ /* 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. <==*/
+
+ 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 (step_over_calls == 0)
+ {
+ /* 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;
+#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. */
+ {
+ 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, NULL, 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;
+ }
- /* 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. */
+ /* We aren't done stepping.
- if (trap_expected > 1)
+ 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))
{
- trap_expected--;
- running_in_shell = 1;
- resume (0, 0);
+ /* 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;
}
- else if (running_in_shell && stop_signal == SIGSEGV)
+
+ 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
+ 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 && 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 (CURRENTLY_STEPPING (), 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,
- stop_signal);
+#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. */
+ /* FIXME: Shouldn't this be based on the valid bit of the SXIP?
+ (this is only used on the 88k). */
+
+ if (!bpstat_explains_signal (stop_bpstat)
+ && (stop_signal != SIGCLD)
+ && !stopped_by_random_signal)
+ SHIFT_INST_REGS();
+#endif /* SHIFT_INST_REGS */
+
+ resume (CURRENTLY_STEPPING (), 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. */
-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\
+ 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. */
- delete_current_display ();
+ 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)
- {
- 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 (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);
}
}
+
+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;
- 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. */
- if (!args)
- error_no_arg ("signal to handle");
+ nsigs = signo_max () + 1;
+ sigs = (unsigned char *) alloca (nsigs);
+ memset (sigs, 0, nsigs);
- while (*p)
+ /* Break the command line up into args. */
+
+ argv = buildargv (args);
+ if (argv == NULL)
+ {
+ 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>. */
+
+ while (*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++);
+ wordlen = strlen (*argv);
+ for (digits = 0; isdigit ((*argv)[digits]); digits++) {;}
+ allsigs = 0;
+ sigfirst = siglast = -1;
- /* If it is all digits, it is signal number to operate on. */
- if (digits == wordlen)
+ if (wordlen >= 1 && !strncmp (*argv, "all", wordlen))
+ {
+ /* 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))
{
- signum = atoi (p);
- if (signum == SIGTRAP || signum == SIGINT)
+ 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] == '-')
{
- if (!query ("Signal %d is used by the debugger.\nAre you sure you want to change it? ", signum))
- error ("Not confirmed.");
+ 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)
+ {
+ error ("Signal %d not in range 0-%d", sigfirst, nsigs - 1);
+ }
+ if (siglast < 0 || siglast >= nsigs)
+ {
+ 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);
- read_line ();
- }
- 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
-static
-initialize ()
+/* 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->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->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;
+
+ memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES);
+
+ read_register_bytes (0, inf_status->registers, REGISTER_BYTES);
+
+ record_selected_frame (&(inf_status->selected_frame_address),
+ &(inf_status->selected_level));
+ return;
+}
+
+struct restore_selected_frame_args {
+ FRAME_ADDR frame_address;
+ int level;
+};
+
+static int restore_selected_frame PARAMS ((char *));
+
+/* Restore the selected frame. args is really a struct
+ restore_selected_frame_args * (declared as char * for catch_errors)
+ telling us what frame to restore. Returns 1 for success, or 0 for
+ failure. An error message will have been printed on error. */
+static int
+restore_selected_frame (args)
+ char *args;
+{
+ struct restore_selected_frame_args *fr =
+ (struct restore_selected_frame_args *) args;
+ FRAME fid;
+ int level = fr->level;
+
+ 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) != fr->frame_address ||
+ level != 0)
+ {
+ warning ("Unable to restore previously selected frame.\n");
+ return 0;
+ }
+ select_frame (fid, fr->level);
+ return(1);
+}
+
+void
+restore_inferior_status (inf_status)
+ struct inferior_status *inf_status;
+{
+ 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;
+ 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;
+
+ memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES);
+
+ /* The inferior can be gone if the user types "print exit(0)"
+ (and perhaps other times). */
+ if (target_has_execution)
+ write_register_bytes (0, inf_status->registers, REGISTER_BYTES);
+
+ /* The inferior can be gone if the user types "print exit(0)"
+ (and perhaps other times). */
+
+ /* FIXME: If we are being called after stopping in a function which
+ is called from gdb, we should not be trying to restore the
+ selected frame; it just prints a spurious error message (The
+ message is useful, however, in detecting bugs in gdb (like if gdb
+ clobbers the stack)). In fact, should we be restoring the
+ inferior status at all in that case? . */
+
+ if (target_has_stack && inf_status->restore_stack_info)
+ {
+ struct restore_selected_frame_args fr;
+ fr.level = inf_status->selected_level;
+ fr.frame_address = inf_status->selected_frame_address;
+ /* The point of catch_errors is that if the stack is clobbered,
+ walking the stack might encounter a garbage pointer and error()
+ trying to dereference it. */
+ if (catch_errors (restore_selected_frame, &fr,
+ "Unable to restore previously selected frame:\n",
+ RETURN_MASK_ERROR) == 0)
+ /* Error in restoring the selected frame. Select the innermost
+ frame. */
+ select_frame (get_current_frame (), 0);
+ }
+}
+
+\f
+void
+_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 */
}
-
-END_FILE
projects / deliverable / binutils-gdb.git / blobdiff