-/* Start (run) and stop the inferior process, for GDB.
- Copyright 1986, 1987, 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
+/* Target-struct-independent code to start (run) and stop an inferior process.
+ Copyright 1986, 1987, 1988, 1989, 1991, 1992, 1993, 1994
+ Free Software Foundation, Inc.
This file is part of GDB.
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 <string.h>
+#include <ctype.h>
#include "symtab.h"
#include "frame.h"
#include "inferior.h"
#include "breakpoint.h"
#include "wait.h"
#include "gdbcore.h"
-#include "command.h"
-#include "terminal.h" /* For #ifdef TIOCGPGRP and new_tty */
+#include "gdbcmd.h"
#include "target.h"
+#include "thread.h"
+#include "annotate.h"
#include <signal.h>
#include <sys/file.h>
#endif
-#ifdef SET_STACK_LIMIT_HUGE
-#include <sys/time.h>
-#include <sys/resource.h>
-
-extern int original_stack_limit;
-#endif /* SET_STACK_LIMIT_HUGE */
-
/* Prototypes for local functions */
static void
static void
handle_command PARAMS ((char *, int));
-static void
-sig_print_info PARAMS ((int));
+static void sig_print_info PARAMS ((enum target_signal));
static void
sig_print_header PARAMS ((void));
-static void
-remove_step_breakpoint PARAMS ((void));
-
-static void
-insert_step_breakpoint PARAMS ((void));
-
-static void
-resume PARAMS ((int, int));
-
static void
resume_cleanups PARAMS ((int));
-extern char **environ;
-
-extern struct target_ops child_ops; /* In inftarg.c */
-
-/* Sigtramp is a routine that the kernel calls (which then calls the
- signal handler). On most machines it is a library routine that
- is linked into the executable.
-
- This macro, given a program counter value and the name of the
- function in which that PC resides (which can be null if the
- name is not known), returns nonzero if the PC and name show
- that we are in sigtramp.
-
- On most machines just see if the name is sigtramp (and if we have
- no name, assume we are not in sigtramp). */
-#if !defined (IN_SIGTRAMP)
-#define IN_SIGTRAMP(pc, name) \
- (name && !strcmp ("_sigtramp", name))
-#endif
+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
#endif
/* For SVR4 shared libraries, each call goes through a small piece of
- trampoline code in the ".init" section. IN_SOLIB_TRAMPOLINE evaluates
+ trampoline code in the ".plt" 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
-/* Notify other parts of gdb that might care that signal handling may
- have changed for one or more signals. */
-#ifndef NOTICE_SIGNAL_HANDLING_CHANGE
-#define NOTICE_SIGNAL_HANDLING_CHANGE /* No actions */
-#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. */
-#ifdef TDESC
-#include "tdesc.h"
-int safe_to_init_tdesc_context = 0;
-extern dc_dcontext_t current_context;
+#ifndef INSTRUCTION_NULLIFIED
+#define INSTRUCTION_NULLIFIED 0
#endif
/* Tables of how to react to signals; the user sets them. */
(flags)[signum] = 0; \
} while (0)
-/* Nonzero if breakpoints are now inserted in the inferior. */
-/* Nonstatic for initialization during xxx_create_inferior. FIXME. */
-
-/*static*/ int breakpoints_inserted;
-/* Function inferior was in as of last step command. */
+/* Command list pointer for the "stop" placeholder. */
-static struct symbol *step_start_function;
+static struct cmd_list_element *stop_command;
-/* Nonzero => address for special breakpoint for resuming stepping. */
-
-static CORE_ADDR step_resume_break_address;
-
-/* Pointer to orig contents of the byte where the special breakpoint is. */
+/* Nonzero if breakpoints are now inserted in the inferior. */
-static char step_resume_break_shadow[BREAKPOINT_MAX];
+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. */
int stop_soon_quietly;
-/* Nonzero if pc has been changed by the debugger
- since the inferior stopped. */
-
-int pc_changed;
-
/* Nonzero if proceed is being used for a "finish" command or a similar
situation when stop_registers should be saved. */
STEP nonzero if we should step (zero to continue instead).
SIG is the signal to give the inferior (zero for none). */
-static void
+void
resume (step, sig)
int step;
- int sig;
+ enum target_signal 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 */
DO_DEFERRED_STORES;
#endif
- target_resume (step, sig);
+ /* Install inferior's terminal modes. */
+ target_terminal_inferior ();
+
+ target_resume (-1, step, sig);
discard_cleanups (old_cleanups);
}
step_range_end = 0;
step_frame_address = 0;
step_over_calls = -1;
- step_resume_break_address = 0;
stop_after_trap = 0;
stop_soon_quietly = 0;
proceed_to_finish = 0;
void
proceed (addr, siggnal, step)
CORE_ADDR addr;
- int siggnal;
+ enum target_signal siggnal;
int step;
{
int oneproc = 0;
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;
+
+#ifdef STEP_SKIPS_DELAY
+ /* Check breakpoint_here_p first, because breakpoint_here_p is fast
+ (it just checks internal GDB data structures) and STEP_SKIPS_DELAY
+ is slow (it needs to read memory from the target). */
+ if (breakpoint_here_p (read_pc () + 4)
+ && STEP_SKIPS_DELAY (read_pc ()))
+ oneproc = 1;
+#endif /* STEP_SKIPS_DELAY */
}
else
- {
- write_register (PC_REGNUM, addr);
-#ifdef NPC_REGNUM
- write_register (NPC_REGNUM, addr + 4);
-#ifdef NNPC_REGNUM
- write_register (NNPC_REGNUM, addr + 8);
-#endif
-#endif
- }
+ write_pc (addr);
+
+#ifdef PREPARE_TO_PROCEED
+ /* In a multi-threaded task we may select another thread and then continue.
+
+ In this case the thread that stopped at a breakpoint will immediately
+ cause another stop, if it is not stepped over first. On the other hand,
+ if (ADDR != -1) we only want to single step over the breakpoint if we did
+ switch to another thread.
+
+ If we are single stepping, don't do any of the above.
+ (Note that in the current implementation single stepping another
+ thread after a breakpoint and then continuing will cause the original
+ breakpoint to be hit again, but you can always continue, so it's not
+ a big deal.) */
+
+ if (! step && PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ()))
+ oneproc = 1;
+#endif /* PREPARE_TO_PROCEED */
if (trap_expected_after_continue)
{
breakpoints_inserted = 1;
}
- /* Install inferior's terminal modes. */
- target_terminal_inferior ();
-
- if (siggnal >= 0)
+ if (siggnal != TARGET_SIGNAL_DEFAULT)
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;
+ else if (!signal_program[stop_signal])
+ stop_signal = TARGET_SIGNAL_0;
+
+ annotate_starting ();
/* Resume inferior. */
resume (oneproc || step || bpstat_should_step (), stop_signal);
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 an inferior Unix child process and sets inferior_pid to its pid.
- EXEC_FILE is the file to run.
- ALLARGS is a string containing the arguments to the program.
- ENV is the environment vector to pass. Errors reported with error(). */
-
-#ifndef SHELL_FILE
-#define SHELL_FILE "/bin/sh"
-#endif
-
-void
-child_create_inferior (exec_file, allargs, env)
- char *exec_file;
- char *allargs;
- char **env;
-{
- int pid;
- char *shell_command;
- char *shell_file;
- static char default_shell_file[] = SHELL_FILE;
- int len;
- int pending_execs;
- /* Set debug_fork then attach to the child while it sleeps, to debug. */
- static int debug_fork = 0;
- /* This is set to the result of setpgrp, which if vforked, will be visible
- to you in the parent process. It's only used by humans for debugging. */
- static int debug_setpgrp = 657473;
- char **save_our_env;
-
- /* The user might want tilde-expansion, and in general probably wants
- the program to behave the same way as if run from
- his/her favorite shell. So we let the shell run it for us.
- FIXME, this should probably search the local environment (as
- modified by the setenv command), not the env gdb inherited. */
- shell_file = getenv ("SHELL");
- if (shell_file == NULL)
- shell_file = default_shell_file;
-
- len = 5 + strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop*/ 10;
- /* If desired, concat something onto the front of ALLARGS.
- SHELL_COMMAND is the result. */
-#ifdef SHELL_COMMAND_CONCAT
- shell_command = (char *) alloca (strlen (SHELL_COMMAND_CONCAT) + len);
- strcpy (shell_command, SHELL_COMMAND_CONCAT);
-#else
- shell_command = (char *) alloca (len);
- shell_command[0] = '\0';
-#endif
- strcat (shell_command, "exec ");
- strcat (shell_command, exec_file);
- strcat (shell_command, " ");
- strcat (shell_command, allargs);
-
- /* exec is said to fail if the executable is open. */
- close_exec_file ();
-
- /* Retain a copy of our environment variables, since the child will
- replace the value of environ and if we're vforked, we have to
- restore it. */
- save_our_env = environ;
-
- /* Tell the terminal handling subsystem what tty we plan to run on;
- it will just record the information for later. */
-
- new_tty_prefork (inferior_io_terminal);
-
- /* It is generally good practice to flush any possible pending stdio
- output prior to doing a fork, to avoid the possibility of both the
- parent and child flushing the same data after the fork. */
-
- fflush (stdout);
- fflush (stderr);
-
-#if defined(USG) && !defined(HAVE_VFORK)
- pid = fork ();
-#else
- if (debug_fork)
- pid = fork ();
- else
- pid = vfork ();
-#endif
-
- if (pid < 0)
- perror_with_name ("vfork");
-
- if (pid == 0)
- {
- if (debug_fork)
- sleep (debug_fork);
-
-#ifdef TIOCGPGRP
- /* Run inferior in a separate process group. */
-#ifdef NEED_POSIX_SETPGID
- debug_setpgrp = setpgid (0, 0);
-#else
-#if defined(USG) && !defined(SETPGRP_ARGS)
- debug_setpgrp = setpgrp ();
-#else
- debug_setpgrp = setpgrp (getpid (), getpid ());
-#endif /* USG */
-#endif /* NEED_POSIX_SETPGID */
- if (debug_setpgrp == -1)
- perror("setpgrp failed in child");
-#endif /* TIOCGPGRP */
-
-#ifdef SET_STACK_LIMIT_HUGE
- /* Reset the stack limit back to what it was. */
- {
- struct rlimit rlim;
-
- getrlimit (RLIMIT_STACK, &rlim);
- rlim.rlim_cur = original_stack_limit;
- setrlimit (RLIMIT_STACK, &rlim);
- }
-#endif /* SET_STACK_LIMIT_HUGE */
-
- /* Ask the tty subsystem to switch to the one we specified earlier
- (or to share the current terminal, if none was specified). */
-
- new_tty ();
-
- /* Changing the signal handlers for the inferior after
- a vfork can also change them for the superior, so we don't mess
- with signals here. See comments in
- initialize_signals for how we get the right signal handlers
- for the inferior. */
-
-#ifdef USE_PROC_FS
- /* Use SVR4 /proc interface */
- proc_set_exec_trap ();
-#else
- /* "Trace me, Dr. Memory!" */
- call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0);
-#endif
-
- /* There is no execlpe call, so we have to set the environment
- for our child in the global variable. If we've vforked, this
- clobbers the parent, but environ is restored a few lines down
- in the parent. By the way, yes we do need to look down the
- path to find $SHELL. Rich Pixley says so, and I agree. */
- environ = env;
- execlp (shell_file, shell_file, "-c", shell_command, (char *)0);
-
- fprintf (stderr, "Cannot exec %s: %s.\n", shell_file,
- safe_strerror (errno));
- fflush (stderr);
- _exit (0177);
- }
-
- /* Restore our environment in case a vforked child clob'd it. */
- environ = save_our_env;
-
- /* Now that we have a child process, make it our target. */
- push_target (&child_ops);
-
-#ifdef CREATE_INFERIOR_HOOK
- CREATE_INFERIOR_HOOK (pid);
-#endif
-
-/* The process was started by the fork that created it,
- but it will have stopped one instruction after execing the shell.
- Here we must get it up to actual execution of the real program. */
-
- inferior_pid = pid; /* Needed for wait_for_inferior stuff below */
-
- clear_proceed_status ();
-
- /* 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
- pending_execs = START_INFERIOR_TRAPS_EXPECTED;
-#else
- pending_execs = 2;
-#endif
-
- init_wait_for_inferior ();
-
- /* Set up the "saved terminal modes" of the inferior
- based on what modes we are starting it with. */
- target_terminal_init ();
-
- /* Install inferior's terminal modes. */
- target_terminal_inferior ();
-
- while (1)
- {
- stop_soon_quietly = 1; /* Make wait_for_inferior be quiet */
- wait_for_inferior ();
- if (stop_signal != SIGTRAP)
- {
- /* Let shell child handle its own signals in its own way */
- /* FIXME, what if child has exit()ed? Must exit loop somehow */
- resume (0, stop_signal);
- }
- else
- {
- /* We handle SIGTRAP, however; it means child did an exec. */
- if (0 == --pending_execs)
- break;
- resume (0, 0); /* Just make it go on */
- }
- }
- stop_soon_quietly = 0;
-
- /* We are now in the child process of interest, having exec'd the
- correct program, and are poised at the first instruction of the
- new program. */
-#ifdef SOLIB_CREATE_INFERIOR_HOOK
- SOLIB_CREATE_INFERIOR_HOOK (pid);
-#endif
-
- /* Pedal to the metal. Away we go. */
- proceed ((CORE_ADDR) -1, 0, 0);
-}
-
/* Start remote-debugging of a machine over a serial link. */
void
{
/* 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 ();
- stop_signal = 0; /* Don't confuse first call to proceed(). */
-}
+ breakpoint_init_inferior ();
+ /* Don't confuse first call to proceed(). */
+ stop_signal = TARGET_SIGNAL_0;
+}
-/* Attach to process PID, then initialize for debugging it
- and wait for the trace-trap that results from attaching. */
-
-void
-child_attach (args, from_tty)
- char *args;
- int from_tty;
+static void
+delete_breakpoint_current_contents (arg)
+ PTR arg;
{
- char *exec_file;
- int pid;
-
- dont_repeat();
-
- if (!args)
- error_no_arg ("process-id to attach");
-
-#ifndef ATTACH_DETACH
- error ("Can't attach to a process on this machine.");
-#else
- pid = atoi (args);
-
- if (pid == getpid()) /* Trying to masturbate? */
- error ("I refuse to debug myself!");
-
- if (target_has_execution)
- {
- if (query ("A program is being debugged already. Kill it? "))
- target_kill ();
- else
- error ("Inferior not killed.");
- }
-
- exec_file = (char *) get_exec_file (1);
-
- if (from_tty)
- {
- printf ("Attaching program: %s pid %d\n",
- exec_file, pid);
- fflush (stdout);
- }
-
- attach (pid);
- inferior_pid = pid;
- push_target (&child_ops);
-
- mark_breakpoints_out ();
- target_terminal_init ();
- clear_proceed_status ();
- stop_soon_quietly = 1;
- /*proceed (-1, 0, -2);*/
- target_terminal_inferior ();
- wait_for_inferior ();
-#ifdef SOLIB_ADD
- SOLIB_ADD ((char *)0, from_tty, (struct target_ops *)0);
-#endif
- normal_stop ();
-#endif /* ATTACH_DETACH */
+ struct breakpoint **breakpointp = (struct breakpoint **)arg;
+ if (*breakpointp != NULL)
+ delete_breakpoint (*breakpointp);
}
\f
/* Wait for control to return from inferior to debugger.
void
wait_for_inferior ()
{
- WAITTYPE w;
+ struct cleanup *old_cleanups;
+ struct target_waitstatus w;
int another_trap;
int random_signal;
- CORE_ADDR stop_sp;
CORE_ADDR stop_func_start;
+ CORE_ADDR stop_func_end;
char *stop_func_name;
- CORE_ADDR prologue_pc, tmp;
- int stop_step_resume_break;
+ CORE_ADDR prologue_pc = 0, tmp;
struct symtab_and_line sal;
int remove_breakpoints_on_following_step = 0;
int current_line;
+ struct symtab *current_symtab;
int handling_longjmp = 0; /* FIXME */
+ struct breakpoint *step_resume_breakpoint = NULL;
+ struct breakpoint *through_sigtramp_breakpoint = NULL;
+ int pid;
+ int update_step_sp = 0;
+ old_cleanups = make_cleanup (delete_breakpoint_current_contents,
+ &step_resume_breakpoint);
+ make_cleanup (delete_breakpoint_current_contents,
+ &through_sigtramp_breakpoint);
sal = find_pc_line(prev_pc, 0);
current_line = sal.line;
+ current_symtab = sal.symtab;
+
+ /* Are we stepping? */
+#define CURRENTLY_STEPPING() \
+ ((through_sigtramp_breakpoint == NULL \
+ && !handling_longjmp \
+ && ((step_range_end && step_resume_breakpoint == NULL) \
+ || trap_expected)) \
+ || bpstat_should_step ())
while (1)
{
- /* Clean up saved state that will become invalid. */
- pc_changed = 0;
- flush_cached_frames ();
+ /* We have to invalidate the registers BEFORE calling target_wait because
+ they can be loaded from the target while in target_wait. This makes
+ remote debugging a bit more efficient for those targets that provide
+ critical registers as part of their normal status mechanism. */
+
registers_changed ();
- target_wait (&w);
+ if (target_wait_hook)
+ pid = target_wait_hook (-1, &w);
+ else
+ pid = target_wait (-1, &w);
-#ifdef SIGTRAP_STOP_AFTER_LOAD
+ flush_cached_frames ();
- /* Somebody called load(2), and it gave us a "trap signal after load".
- Ignore it gracefully. */
+ /* If it's a new process, add it to the thread database */
- SIGTRAP_STOP_AFTER_LOAD (w);
-#endif
+ if (pid != inferior_pid
+ && !in_thread_list (pid))
+ {
+ fprintf_unfiltered (gdb_stderr, "[New %s]\n", target_pid_to_str (pid));
+ add_thread (pid);
+
+ /* We may want to consider not doing a resume here in order to give
+ the user a chance to play with the new thread. It might be good
+ to make that a user-settable option. */
+
+ /* At this point, all threads are stopped (happens automatically in
+ either the OS or the native code). Therefore we need to continue
+ all threads in order to make progress. */
+
+ target_resume (-1, 0, TARGET_SIGNAL_0);
+ continue;
+ }
- /* See if the process still exists; clean up if it doesn't. */
- if (WIFEXITED (w))
+ switch (w.kind)
{
+ case TARGET_WAITKIND_LOADED:
+ /* Ignore it gracefully. */
+ if (breakpoints_inserted)
+ {
+ mark_breakpoints_out ();
+ insert_breakpoints ();
+ }
+ resume (0, TARGET_SIGNAL_0);
+ continue;
+
+ case TARGET_WAITKIND_SPURIOUS:
+ resume (0, TARGET_SIGNAL_0);
+ continue;
+
+ case TARGET_WAITKIND_EXITED:
target_terminal_ours (); /* Must do this before mourn anyway */
- if (WEXITSTATUS (w))
+ annotate_exited (w.value.integer);
+ if (w.value.integer)
printf_filtered ("\nProgram exited with code 0%o.\n",
- (unsigned int)WEXITSTATUS (w));
+ (unsigned int)w.value.integer);
else
- if (!batch_mode())
- printf_filtered ("\nProgram exited normally.\n");
- fflush (stdout);
+ printf_filtered ("\nProgram exited normally.\n");
+ gdb_flush (gdb_stdout);
target_mourn_inferior ();
#ifdef NO_SINGLE_STEP
one_stepped = 0;
#endif
stop_print_frame = 0;
- break;
- }
- else if (!WIFSTOPPED (w))
- {
+ goto stop_stepping;
+
+ case TARGET_WAITKIND_SIGNALLED:
stop_print_frame = 0;
- stop_signal = WTERMSIG (w);
+ stop_signal = w.value.sig;
target_terminal_ours (); /* Must do this before mourn anyway */
+ annotate_signalled ();
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 %d, %s\n",
- stop_signal, safe_strsignal (stop_signal));
-#endif
- printf_filtered ("The inferior process no longer exists.\n");
- fflush (stdout);
+ printf_filtered ("\nProgram terminated with signal ");
+ annotate_signal_name ();
+ printf_filtered ("%s", target_signal_to_name (stop_signal));
+ annotate_signal_name_end ();
+ printf_filtered (", ");
+ annotate_signal_string ();
+ printf_filtered ("%s", target_signal_to_string (stop_signal));
+ annotate_signal_string_end ();
+ printf_filtered (".\n");
+
+ printf_filtered ("The program no longer exists.\n");
+ gdb_flush (gdb_stdout);
#ifdef NO_SINGLE_STEP
one_stepped = 0;
#endif
+ goto stop_stepping;
+
+ case TARGET_WAITKIND_STOPPED:
+ /* This is the only case in which we keep going; the above cases
+ end in a continue or goto. */
break;
}
-
+
+ stop_signal = w.value.sig;
+
+ stop_pc = read_pc_pid (pid);
+
+ /* See if a thread hit a thread-specific breakpoint that was meant for
+ another thread. If so, then step that thread past the breakpoint,
+ and continue it. */
+
+ if (stop_signal == TARGET_SIGNAL_TRAP
+ && breakpoints_inserted
+ && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK))
+ {
+ random_signal = 0;
+ if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, pid))
+ {
+ /* Saw a breakpoint, but it was hit by the wrong thread. Just continue. */
+ write_pc (stop_pc - DECR_PC_AFTER_BREAK);
+
+ remove_breakpoints ();
+ target_resume (pid, 1, TARGET_SIGNAL_0); /* Single step */
+ /* FIXME: What if a signal arrives instead of the single-step
+ happening? */
+
+ if (target_wait_hook)
+ target_wait_hook (pid, &w);
+ else
+ target_wait (pid, &w);
+ insert_breakpoints ();
+ target_resume (pid, 0, TARGET_SIGNAL_0);
+ continue;
+ }
+ }
+ else
+ random_signal = 1;
+
+ /* See if something interesting happened to the non-current thread. If
+ so, then switch to that thread, and eventually give control back to
+ the user. */
+
+ if (pid != inferior_pid)
+ {
+ int printed = 0;
+
+ /* If it's a random signal for a non-current thread, notify user
+ if he's expressed an interest. */
+
+ if (random_signal
+ && signal_print[stop_signal])
+ {
+ printed = 1;
+ target_terminal_ours_for_output ();
+ printf_filtered ("\nProgram received signal %s, %s.\n",
+ target_signal_to_name (stop_signal),
+ target_signal_to_string (stop_signal));
+ gdb_flush (gdb_stdout);
+ }
+
+ /* If it's not SIGTRAP and not a signal we want to stop for, then
+ continue the thread. */
+
+ if (stop_signal != TARGET_SIGNAL_TRAP
+ && !signal_stop[stop_signal])
+ {
+ if (printed)
+ target_terminal_inferior ();
+
+ /* Clear the signal if it should not be passed. */
+ if (signal_program[stop_signal] == 0)
+ stop_signal = TARGET_SIGNAL_0;
+
+ target_resume (pid, 0, stop_signal);
+ continue;
+ }
+
+ /* It's a SIGTRAP or a signal we're interested in. Switch threads,
+ and fall into the rest of wait_for_inferior(). */
+
+ inferior_pid = pid;
+ printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid));
+
+ flush_cached_frames ();
+ trap_expected = 0;
+ if (step_resume_breakpoint)
+ {
+ delete_breakpoint (step_resume_breakpoint);
+ step_resume_breakpoint = NULL;
+ }
+
+ /* Not sure whether we need to blow this away too,
+ but probably it is like the step-resume
+ breakpoint. */
+ if (through_sigtramp_breakpoint)
+ {
+ delete_breakpoint (through_sigtramp_breakpoint);
+ through_sigtramp_breakpoint = NULL;
+ }
+ prev_pc = 0;
+ prev_func_name = NULL;
+ step_range_start = 0;
+ step_range_end = 0;
+ step_frame_address = 0;
+ handling_longjmp = 0;
+ another_trap = 0;
+ }
+
#ifdef NO_SINGLE_STEP
if (one_stepped)
single_step (0); /* This actually cleans up the ss */
#endif /* NO_SINGLE_STEP */
- stop_pc = read_pc ();
- set_current_frame ( create_new_frame (read_register (FP_REGNUM),
- read_pc ()));
-
- stop_frame_address = FRAME_FP (get_current_frame ());
- stop_sp = read_register (SP_REGNUM);
+ /* 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 (INSTRUCTION_NULLIFIED)
+ {
+ resume (1, 0);
+ continue;
+ }
+
+#ifdef HAVE_STEPPABLE_WATCHPOINT
+ /* It may not be necessary to disable the watchpoint to stop over
+ it. For example, the PA can (with some kernel cooperation)
+ single step over a watchpoint without disabling the watchpoint. */
+ if (STOPPED_BY_WATCHPOINT (w))
+ {
+ resume (1, 0);
+ continue;
+ }
+#endif
+
+#ifdef HAVE_NONSTEPPABLE_WATCHPOINT
+ /* It is far more common to need to disable a watchpoint
+ to step the inferior over it. FIXME. What else might
+ a debug register or page protection watchpoint scheme need
+ here? */
+ if (STOPPED_BY_WATCHPOINT (w))
+ {
+ remove_breakpoints ();
+ resume (1, 0);
+
+ /* FIXME: This is bogus. You can't interact with the
+ inferior except when it is stopped. It apparently
+ happens to work on Irix4, but it depends on /proc
+ allowing us to muck with the memory of a running process,
+ and the kernel deciding to run one instruction of the
+ inferior before it executes our insert_breakpoints code,
+ which seems like an awfully dubious assumption. */
+ insert_breakpoints ();
+
+ continue;
+ }
+#endif
+
+#ifdef HAVE_CONTINUABLE_WATCHPOINT
+ /* It may be possible to simply continue after a watchpoint. */
+ STOPPED_BY_WATCHPOINT (w);
+#endif
+
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);
+ find_pc_partial_function (stop_pc, &stop_func_name, &stop_func_start,
+ &stop_func_end);
stop_func_start += FUNCTION_START_OFFSET;
another_trap = 0;
bpstat_clear (&stop_bpstat);
stop_step = 0;
stop_stack_dummy = 0;
stop_print_frame = 1;
- stop_step_resume_break = 0;
random_signal = 0;
stopped_by_random_signal = 0;
breakpoints_failed = 0;
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
Here we detect when a SIGILL or SIGEMT is really a breakpoint
and change it to SIGTRAP. */
- if (stop_signal == SIGTRAP
+ if (stop_signal == TARGET_SIGNAL_TRAP
|| (breakpoints_inserted &&
- (stop_signal == SIGILL
-#ifdef SIGEMT
- || stop_signal == SIGEMT
-#endif
+ (stop_signal == TARGET_SIGNAL_ILL
+ || stop_signal == TARGET_SIGNAL_EMT
))
|| stop_soon_quietly)
{
- if (stop_signal == SIGTRAP && stop_after_trap)
+ if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap)
{
stop_print_frame = 0;
break;
if just proceeded over a breakpoint.
However, if we are trying to proceed over a breakpoint
- and end up in sigtramp, then step_resume_break_address
+ and end up in sigtramp, then through_sigtramp_breakpoint
will be set and we should check whether we've hit the
step breakpoint. */
- if (stop_signal == SIGTRAP && trap_expected
- && step_resume_break_address == 0)
+ if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected
+ && through_sigtramp_breakpoint == NULL)
bpstat_clear (&stop_bpstat);
else
{
/* See if there is a breakpoint at the current PC. */
+ stop_bpstat = bpstat_stop_status
+ (&stop_pc,
#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. */
- if (prev_pc == stop_pc - DECR_PC_AFTER_BREAK
- || !step_range_end
- || step_resume_break_address
- || handling_longjmp /* FIXME */)
-#endif /* DECR_PC_AFTER_BREAK not zero */
- {
- /* See if we stopped at the special breakpoint for
- stepping over a subroutine call. If both are zero,
- this wasn't the reason for the stop. */
- if (step_resume_break_address
- && 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;
- }
- }
- else
- {
- stop_bpstat =
- bpstat_stop_status (&stop_pc, stop_frame_address);
- /* Following in case break condition called a
- function. */
- stop_print_frame = 1;
- }
- }
+ /* 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 (stop_signal == SIGTRAP)
+
+ if (stop_signal == TARGET_SIGNAL_TRAP)
random_signal
= !(bpstat_explains_signal (stop_bpstat)
|| trap_expected
- || stop_step_resume_break
- || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)
- || (step_range_end && !step_resume_break_address));
+#ifndef CALL_DUMMY_BREAKPOINT_OFFSET
+ || PC_IN_CALL_DUMMY (stop_pc, read_sp (),
+ FRAME_FP (get_current_frame ()))
+#endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
+ || (step_range_end && step_resume_breakpoint == NULL));
else
{
random_signal
= !(bpstat_explains_signal (stop_bpstat)
- || stop_step_resume_break
/* End of a stack dummy. Some systems (e.g. Sony
news) give another signal besides SIGTRAP,
so check here as well as above. */
- || PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address)
+#ifndef CALL_DUMMY_BREAKPOINT_OFFSET
+ || PC_IN_CALL_DUMMY (stop_pc, read_sp (),
+ FRAME_FP (get_current_frame ()))
+#endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */
);
if (!random_signal)
- stop_signal = SIGTRAP;
+ stop_signal = TARGET_SIGNAL_TRAP;
}
}
else
random_signal = 1;
-
+
/* For the program's own signals, act according to
the signal handling tables. */
-
+
if (random_signal)
{
/* Signal not for debugging purposes. */
stopped_by_random_signal = 1;
- if (stop_signal >= NSIG
- || signal_print[stop_signal])
+ if (signal_print[stop_signal])
{
printed = 1;
target_terminal_ours_for_output ();
-#ifdef PRINT_RANDOM_SIGNAL
- PRINT_RANDOM_SIGNAL (stop_signal);
-#else
- printf_filtered ("\nProgram received signal %d, %s\n",
- stop_signal, safe_strsignal (stop_signal));
-#endif /* PRINT_RANDOM_SIGNAL */
- fflush (stdout);
+ annotate_signal ();
+ printf_filtered ("\nProgram received signal ");
+ annotate_signal_name ();
+ printf_filtered ("%s", target_signal_to_name (stop_signal));
+ annotate_signal_name_end ();
+ printf_filtered (", ");
+ annotate_signal_string ();
+ printf_filtered ("%s", target_signal_to_string (stop_signal));
+ annotate_signal_string_end ();
+ printf_filtered (".\n");
+ gdb_flush (gdb_stdout);
}
- if (stop_signal >= NSIG
- || signal_stop[stop_signal])
+ if (signal_stop[stop_signal])
break;
/* If not going to stop, give terminal back
if we took it away. */
else if (printed)
target_terminal_inferior ();
- /* Note that virtually all the code below does `if !random_signal'.
- Perhaps this code should end with a goto or continue. At least
- one (now fixed) bug was caused by this -- a !random_signal was
- missing in one of the tests below. */
+ /* Clear the signal if it should not be passed. */
+ if (signal_program[stop_signal] == 0)
+ stop_signal = TARGET_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);
- if (!random_signal)
- if (bpstat_explains_signal (stop_bpstat))
+ if (what.call_dummy)
{
- CORE_ADDR jmp_buf_pc;
+ stop_stack_dummy = 1;
+#ifdef HP_OS_BUG
+ trap_expected_after_continue = 1;
+#endif
+ }
- switch (stop_bpstat->breakpoint_at->type) /* FIXME */
+ 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)
{
- /* 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. */
- case bp_longjmp:
- 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 */
- remove_step_breakpoint ();
- step_resume_break_address = 0;
- stop_step_resume_break = 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;
+ delete_breakpoint (step_resume_breakpoint);
+ step_resume_breakpoint = NULL;
+ }
+ /* Not sure whether we need to blow this away too, but probably
+ it is like the step-resume breakpoint. */
+ if (through_sigtramp_breakpoint != NULL)
+ {
+ delete_breakpoint (through_sigtramp_breakpoint);
+ through_sigtramp_breakpoint = NULL;
+ }
- case bp_longjmp_resume:
- 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;
- }
+#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 */
- disable_longjmp_breakpoint();
- handling_longjmp = 0; /* FIXME */
- break;
-
- default:
- fprintf(stderr, "Unknown breakpoint type %d\n",
- stop_bpstat->breakpoint_at->type);
- case bp_watchpoint:
- case bp_breakpoint:
- case bp_until:
- case bp_finish:
- /* Does a breakpoint want us to stop? */
- if (bpstat_stop (stop_bpstat))
- {
- stop_print_frame = bpstat_should_print (stop_bpstat);
- goto stop_stepping;
- }
- /* 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;
- }
- break;
- }
- }
- else if (stop_step_resume_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. */
-
- /*
- Disable test for step_frame_address match so that we always stop even if the
- frames don't match. Reason: if we hit the step_resume_breakpoint, there is
- no way to temporarily disable it so that we can step past it. If we leave
- the breakpoint in, then we loop forever repeatedly hitting, but never
- getting past the breakpoint. This change keeps nexting over recursive
- function calls from hanging gdb.
- */
+ 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
- if (* step_frame_address == 0
- || (step_frame_address == stop_frame_address))
-#endif
+ /* FIXME - Need to implement nested temporary breakpoints */
+ if (step_over_calls
+ && (FRAME_FP (get_current_frame ())
+ INNER_THAN step_frame_address))
{
- remove_step_breakpoint ();
- step_resume_break_address = 0;
-
- /* If were waiting for a trap, hitting the step_resume_break
- doesn't count as getting it. */
- if (trap_expected)
- another_trap = 1;
+ 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 and
+ through_sigtramp_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 and
+ through_sigtramp_breakpoint via the cleanup chain, so
+ no need to worry about it here. */
+
+ goto stop_stepping;
+
+ case BPSTAT_WHAT_STEP_RESUME:
+ delete_breakpoint (step_resume_breakpoint);
+ step_resume_breakpoint = NULL;
+ break;
+
+ case BPSTAT_WHAT_THROUGH_SIGTRAMP:
+ if (through_sigtramp_breakpoint)
+ delete_breakpoint (through_sigtramp_breakpoint);
+ through_sigtramp_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;
+ break;
+
+ case BPSTAT_WHAT_LAST:
+ /* Not a real code, but listed here to shut up gcc -Wall. */
+
+ case BPSTAT_WHAT_KEEP_CHECKING:
+ break;
}
+ }
/* We come here if we hit a breakpoint but should not
stop for it. Possibly we also were stepping
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. */
- if (!random_signal
- && PC_IN_CALL_DUMMY (stop_pc, stop_sp, stop_frame_address))
- {
- stop_print_frame = 0;
- stop_stack_dummy = 1;
+ 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, read_sp (), FRAME_FP (get_current_frame ()))
+ && !step_range_end)
+ {
+ stop_print_frame = 0;
+ stop_stack_dummy = 1;
#ifdef HP_OS_BUG
- trap_expected_after_continue = 1;
+ trap_expected_after_continue = 1;
#endif
- break;
- }
-
- if (step_resume_break_address)
+ 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'm not sure whether this needs to be check_sigtramp2 or
+ whether it could/should be keep_going. */
+ 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 INNER_THAN 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
+ && FRAME_FP (get_current_frame ())
+ && (read_sp () INNER_THAN step_sp
+ || FRAME_FP (get_current_frame ()) != 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. */
- else if (!random_signal && step_range_end)
+
+ /* We stepped out of the stepping range. */
+
+ /* We can't update step_sp every time through the loop, because
+ reading the stack pointer would slow down stepping too much.
+ But we can update it every time we leave the step range. */
+ update_step_sp = 1;
+
+ /* 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);
- }
+ /* We've just taken a signal; go until we are back to
+ the point where we took it and one more. */
+
+ /* This code is needed at least in the following case:
+ The user types "next" and then a signal arrives (before
+ the "next" is done). */
+
+ /* Note that if we are stopped at a breakpoint, then we need
+ the step_resume breakpoint to override any breakpoints at
+ the same location, so that we will still step over the
+ breakpoint even though the signal happened. */
+
+ {
+ struct symtab_and_line sr_sal;
+
+ sr_sal.pc = prev_pc;
+ sr_sal.symtab = NULL;
+ sr_sal.line = 0;
+ /* We could probably be setting the frame to
+ step_frame_address; I don't think anyone thought to try it. */
+ step_resume_breakpoint =
+ set_momentary_breakpoint (sr_sal, NULL, 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 1
+ /* See if we left the step range due to a subroutine call that
+ we should proceed to the end of. */
+
+ if (stop_func_start)
+ {
+ struct symtab *s;
+
+ /* Do this after the IN_SIGTRAMP check; it might give
+ an error. */
+ prologue_pc = stop_func_start;
+
+ /* Don't skip the prologue if this is assembly source */
+ s = find_pc_symtab (stop_pc);
+ if (s && s->language != language_asm)
+ SKIP_PROLOGUE (prologue_pc);
+ }
+
+ if ((/* Might be a non-recursive call. If the symbols are missing
+ enough that stop_func_start == prev_func_start even though
+ they are really two functions, we will treat some calls as
+ jumps. */
+ stop_func_start != prev_func_start
+
+ /* Might be a recursive call if either we have a prologue
+ or the call instruction itself saves the PC on the stack. */
+ || prologue_pc != stop_func_start
+ || read_sp () != step_sp)
+ && (/* PC is completely out of bounds of any known objfiles. Treat
+ like a subroutine call. */
+ ! stop_func_start
+
+ /* If we do a call, we will be at the start of a function... */
+ || stop_pc == stop_func_start
+
+ /* ...except on the Alpha with -O (and also Irix 5 and
+ perhaps others), in which we might call the address
+ after the load of gp. Since prologues don't contain
+ calls, we can't return to within one, and we don't
+ jump back into them, so this check is OK. */
+
+ || stop_pc < prologue_pc
+
+ /* ...and if it is a leaf function, the prologue might
+ consist of gp loading only, so the call transfers to
+ the first instruction after the prologue. */
+ || (stop_pc == prologue_pc
+
+ /* Distinguish this from the case where we jump back
+ to the first instruction after the prologue,
+ within a function. */
+ && stop_func_start != prev_func_start)
+
+ /* If we end up in certain places, it means we did a subroutine
+ call. I'm not completely sure this is necessary now that we
+ have the above checks with stop_func_start (and now that
+ find_pc_partial_function is pickier). */
+ || IN_SOLIB_TRAMPOLINE (stop_pc, stop_func_name)
+
+ /* If none of the above apply, it is a jump within a function,
+ or a return from a subroutine. The other case is longjmp,
+ which can no longer happen here as long as the
+ handling_longjmp stuff is working. */
+ ))
+#else
+/* This is experimental code which greatly simplifies the subroutine call
+ test. I've actually tested on the Alpha, and it works great. -Stu */
+
+ if (in_prologue (stop_pc, NULL)
+ || (prev_func_start != 0
+ && stop_func_start == 0))
+#endif
+ {
+ /* It's a subroutine call. */
- /* Did we just take a signal? */
- if (IN_SIGTRAMP (stop_pc, stop_func_name)
- && !IN_SIGTRAMP (prev_pc, prev_func_name))
+ if (step_over_calls == 0)
{
- /* This code is needed at least in the following case:
- The user types "next" and then a signal arrives (before
- the "next" is done). */
- /* We've just taken a signal; go until we are back to
- the point where we took it and one more. */
- step_resume_break_address = prev_pc;
- step_resume_break_duplicate =
- breakpoint_here_p (step_resume_break_address);
- if (breakpoints_inserted)
- insert_step_breakpoint ();
- /* Make sure that the stepping range gets us past
- that instruction. */
- if (step_range_end == 1)
- step_range_end = (step_range_start = prev_pc) + 1;
- remove_breakpoints_on_following_step = 1;
- goto save_pc;
+ /* 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;
}
- /* ==> 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.
- (0) If we are not stepping over any calls ("stepi"), we
- just stop.
- (1) If we're doing a "next", we want to continue through
- the call ("step over the call").
- (2) If we are in a function-call trampoline (a stub between
- the calling routine and the real function), locate
- the real function and change stop_func_start.
- (3) If we're doing a "step", and there are no debug symbols
- at the target of the call, we want to continue through
- it ("step over the call").
- (4) Otherwise, we want to stop soon, after the function
- prologue ("step into the 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. */
- stop_step = 1;
- break;
- }
-
- if (step_over_calls > 0)
- goto step_over_function;
-
- tmp = SKIP_TRAMPOLINE_CODE (stop_pc);
- if (tmp != 0)
- stop_func_start = tmp;
-
- if (find_pc_function (stop_func_start) != 0)
- goto step_into_function;
+ 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 */
- step_resume_break_address =
- ADDR_BITS_REMOVE
- (SAVED_PC_AFTER_CALL (get_current_frame ()));
- step_resume_break_duplicate
- = breakpoint_here_p (step_resume_break_address);
- if (breakpoints_inserted)
- insert_step_breakpoint ();
- goto save_pc;
+ /* 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);
+ step_resume_breakpoint->frame = step_frame_address;
+ 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. */
+ /* Subroutine call with source code we should not step over.
+ Do step to the first line of code in it. */
+ {
+ struct symtab *s;
+
+ s = find_pc_symtab (stop_pc);
+ if (s && s->language != language_asm)
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. */
+ }
+ 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 (if it is still
+ within the function). 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. */
+ /* 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 && sal.end < stop_func_end)
+ 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_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;
- }
- goto save_pc;
+ 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). */
+ /* We've wandered out of the step range. */
- sal = find_pc_line(stop_pc, 0);
-
- if (step_range_end == 1 || /* stepi or nexti */
- sal.line == 0 || /* ...or no line # info */
- (stop_pc == sal.pc /* ...or we're at the start */
- && current_line != sal.line)) { /* of a different line */
- /* Stop because we're done stepping. */
- stop_step = 1;
- break;
- } else {
- /* We aren't done stepping, and we have line number info for $pc.
- Optimize by setting the step_range for 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 save_pc;
- }
- /* We never fall through here */
+ 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 || current_symtab != sal.symtab))
+ {
+ /* 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.) */
+
+ if (stop_func_end && sal.end >= stop_func_end)
+ {
+ /* If this is the last line of the function, don't keep stepping
+ (it would probably step us out of the function).
+ This is particularly necessary for a one-line function,
+ in which after skipping the prologue we better stop even though
+ we will be in mid-line. */
+ stop_step = 1;
+ break;
}
+ 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))
us stop), thus stepping into sigtramp.
So we need to set a step_resume_break_address breakpoint
- and continue until we hit it, and then step. */
- step_resume_break_address = prev_pc;
- /* Always 1, I think, but it's probably easier to have
- the step_resume_break as usual rather than trying to
- re-use the breakpoint which is already there. */
- step_resume_break_duplicate =
- breakpoint_here_p (step_resume_break_address);
+ 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;
+ /* We perhaps could set the frame if we kept track of what
+ the frame corresponding to prev_pc was. But we don't,
+ so don't. */
+ through_sigtramp_breakpoint =
+ set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp);
if (breakpoints_inserted)
- insert_step_breakpoint ();
+ insert_breakpoints ();
+
remove_breakpoints_on_following_step = 1;
another_trap = 1;
}
-/* My apologies to the gods of structured programming. */
-/* Come to this label when you need to resume the inferior. It's really much
- cleaner at this time to do a goto than to try and figure out what the
- if-else chain ought to look like!! */
-
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_pc:
/* 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
been at the start of a
function. */
prev_func_name = stop_func_name;
- prev_sp = stop_sp;
+
+ if (update_step_sp)
+ step_sp = read_sp ();
+ update_step_sp = 0;
/* 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)
+ if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP)
{
/* We took a signal (which we are supposed to pass through to
the inferior, else we'd have done a break above) and we
haven't yet gotten our trap. Simply continue. */
- resume ((step_range_end && !step_resume_break_address)
- || (trap_expected && !step_resume_break_address)
- || bpstat_should_step (),
- stop_signal);
+ resume (CURRENTLY_STEPPING (), stop_signal);
}
else
{
to one-proceed past a breakpoint. */
/* If we've just finished a special step resume and we don't
want to hit a breakpoint, pull em out. */
- if (!step_resume_break_address &&
- remove_breakpoints_on_following_step)
+ if (step_resume_breakpoint == NULL
+ && through_sigtramp_breakpoint == NULL
+ && remove_breakpoints_on_following_step)
{
remove_breakpoints_on_following_step = 0;
remove_breakpoints ();
breakpoints_inserted = 0;
}
else if (!breakpoints_inserted &&
- (step_resume_break_address != 0 || !another_trap))
+ (through_sigtramp_breakpoint != NULL || !another_trap))
{
- insert_step_breakpoint ();
breakpoints_failed = insert_breakpoints ();
if (breakpoints_failed)
break;
trap_expected = another_trap;
- if (stop_signal == SIGTRAP)
- stop_signal = 0;
+ if (stop_signal == TARGET_SIGNAL_TRAP)
+ stop_signal = TARGET_SIGNAL_0;
#ifdef SHIFT_INST_REGS
/* I'm not sure when this following segment applies. I do know, now,
that we shouldn't rewrite the regs when we were stopped by a
random signal from the inferior process. */
+ /* 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)
+ && (stop_signal != TARGET_SIGNAL_CHLD)
&& !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);
- }
- }
+ SHIFT_INST_REGS();
#endif /* SHIFT_INST_REGS */
- resume ((!step_resume_break_address
- && !handling_longjmp
- && (step_range_end
- || trap_expected))
- || bpstat_should_step (),
- stop_signal);
+ resume (CURRENTLY_STEPPING (), stop_signal);
}
}
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.
/* 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)
+ if (target_has_execution && get_current_frame())
(get_current_frame ())->pc = read_pc ();
if (breakpoints_failed)
The same program may be running in another process.\n");
}
- if (target_has_execution)
- remove_step_breakpoint ();
-
if (target_has_execution && breakpoints_inserted)
if (remove_breakpoints ())
{
disable_current_display ();
if (step_multi && stop_step)
- return;
+ goto done;
target_terminal_ours ();
+ /* Look up the hook_stop and run it if it exists. */
+
+ if (stop_command->hook)
+ {
+ catch_errors (hook_stop_stub, (char *)stop_command->hook,
+ "Error while running hook_stop:\n", RETURN_MASK_ALL);
+ }
+
if (!target_has_stack)
- return;
+ goto done;
/* Select innermost stack frame except on return from a stack dummy routine,
or if the program has exited. Print it without a level number if
source_only = bpstat_print (stop_bpstat);
source_only = source_only ||
( stop_step
- && step_frame_address == stop_frame_address
+ && step_frame_address == FRAME_FP (get_current_frame ())
&& step_start_function == find_pc_function (stop_pc));
print_stack_frame (selected_frame, -1, source_only? -1: 1);
POP_FRAME ends with a setting of the current frame, so we
can use that next. */
POP_FRAME;
+ /* Set stop_pc to what it was before we called the function. Can't rely
+ on restore_inferior_status because that only gets called if we don't
+ stop in the called function. */
+ stop_pc = read_pc();
select_frame (get_current_frame (), 0);
}
-}
-\f
-static void
-insert_step_breakpoint ()
-{
- if (step_resume_break_address && !step_resume_break_duplicate)
- target_insert_breakpoint (step_resume_break_address,
- step_resume_break_shadow);
+ done:
+ annotate_stopped ();
}
-static void
-remove_step_breakpoint ()
+static int
+hook_stop_stub (cmd)
+ char *cmd;
{
- if (step_resume_break_address && !step_resume_break_duplicate)
- target_remove_breakpoint (step_resume_break_address,
- step_resume_break_shadow);
+ 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);
+ return signal_stop[signo];
}
int signal_print_state (signo)
int signo;
{
- return ((signo >= 0 && signo < NSIG) ? signal_print[signo] : 0);
+ return signal_print[signo];
}
int signal_pass_state (signo)
int signo;
{
- return ((signo >= 0 && signo < NSIG) ? signal_program[signo] : 0);
+ return signal_program[signo];
}
static void
sig_print_header ()
{
- printf_filtered ("Signal\t\tStop\tPrint\tPass to program\tDescription\n");
+ printf_filtered ("\
+Signal Stop\tPrint\tPass to program\tDescription\n");
}
static void
-sig_print_info (number)
- int number;
+sig_print_info (oursig)
+ enum target_signal oursig;
{
- 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));
+ char *name = target_signal_to_name (oursig);
+ printf_filtered ("%s", name);
+ printf_filtered ("%*.*s ", 13 - strlen (name), 13 - strlen (name),
+ " ");
+ printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No");
+ printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No");
+ printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
+ printf_filtered ("%s\n", target_signal_to_string (oursig));
}
/* Specify how various signals in the inferior should be handled. */
char **argv;
int digits, wordlen;
int sigfirst, signum, siglast;
+ enum target_signal oursig;
int allsigs;
int nsigs;
unsigned char *sigs;
/* Allocate and zero an array of flags for which signals to handle. */
- nsigs = signo_max () + 1;
+ nsigs = (int)TARGET_SIGNAL_LAST;
sigs = (unsigned char *) alloca (nsigs);
memset (sigs, 0, nsigs);
}
old_chain = make_cleanup (freeargv, (char *) argv);
- /* Walk through the args, looking for signal numbers, signal names, and
+ /* Walk through the args, looking for signal oursigs, 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>. */
}
else if (digits > 0)
{
+ /* It is numeric. The numeric signal refers to our own internal
+ signal numbering from target.h, not to host/target signal number.
+ This is a feature; users really should be using symbolic names
+ anyway, and the common ones like SIGHUP, SIGINT, SIGALRM, etc.
+ will work right anyway. */
+
sigfirst = siglast = atoi (*argv);
if ((*argv)[digits] == '-')
{
error ("Signal %d not in range 0-%d", siglast, nsigs - 1);
}
}
- else if ((signum = strtosigno (*argv)) != 0)
- {
- sigfirst = siglast = signum;
- }
else
{
- /* Not a number and not a recognized flag word => complain. */
- error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
+ oursig = target_signal_from_name (*argv);
+ if (oursig != TARGET_SIGNAL_UNKNOWN)
+ {
+ sigfirst = siglast = (int)oursig;
+ }
+ else
+ {
+ /* Not a number and not a recognized flag word => complain. */
+ error ("Unrecognized or ambiguous flag word: \"%s\".", *argv);
+ }
}
/* If any signal numbers or symbol names were found, set flags for
for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
{
- switch (signum)
+ switch ((enum target_signal)signum)
{
- case SIGTRAP:
- case SIGINT:
+ case TARGET_SIGNAL_TRAP:
+ case TARGET_SIGNAL_INT:
if (!allsigs && !sigs[signum])
{
- if (query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum)))
+ if (query ("%s is used by the debugger.\n\
+Are you sure you want to change it? ",
+ target_signal_to_name
+ ((enum target_signal)signum)))
{
sigs[signum] = 1;
}
else
{
- printf ("Not confirmed, unchanged.\n");
- fflush (stdout);
+ printf_unfiltered ("Not confirmed, unchanged.\n");
+ gdb_flush (gdb_stdout);
}
}
break;
argv++;
}
- NOTICE_SIGNAL_HANDLING_CHANGE;
+ target_notice_signals(inferior_pid);
if (from_tty)
{
do_cleanups (old_chain);
}
-/* Print current contents of the tables set by the handle command. */
+/* Print current contents of the tables set by the handle command.
+ It is possible we should just be printing signals actually used
+ by the current target (but for things to work right when switching
+ targets, all signals should be in the signal tables). */
static void
signals_info (signum_exp, from_tty)
char *signum_exp;
int from_tty;
{
- register int i;
+ enum target_signal oursig;
sig_print_header ();
if (signum_exp)
{
/* First see if this is a symbol name. */
- i = strtosigno (signum_exp);
- if (i == 0)
+ oursig = target_signal_from_name (signum_exp);
+ if (oursig == TARGET_SIGNAL_UNKNOWN)
{
/* Nope, maybe it's an address which evaluates to a signal
number. */
- i = parse_and_eval_address (signum_exp);
- if (i >= NSIG || i < 0)
+ /* The numeric signal refers to our own internal
+ signal numbering from target.h, not to host/target signal number.
+ This is a feature; users really should be using symbolic names
+ anyway, and the common ones like SIGHUP, SIGINT, SIGALRM, etc.
+ will work right anyway. */
+ int i = parse_and_eval_address (signum_exp);
+ if (i >= (int)TARGET_SIGNAL_LAST
+ || i < 0
+ || i == (int)TARGET_SIGNAL_UNKNOWN
+ || i == (int)TARGET_SIGNAL_DEFAULT)
error ("Signal number out of bounds.");
+ oursig = (enum target_signal)i;
}
- sig_print_info (i);
+ sig_print_info (oursig);
return;
}
printf_filtered ("\n");
- for (i = 0; i < NSIG; i++)
+ /* These ugly casts brought to you by the native VAX compiler. */
+ for (oursig = TARGET_SIGNAL_FIRST;
+ (int)oursig < (int)TARGET_SIGNAL_LAST;
+ oursig = (enum target_signal)((int)oursig + 1))
{
QUIT;
- sig_print_info (i);
+ if (oursig != TARGET_SIGNAL_UNKNOWN
+ && oursig != TARGET_SIGNAL_DEFAULT
+ && oursig != TARGET_SIGNAL_0)
+ sig_print_info (oursig);
}
printf_filtered ("\nUse the \"handle\" command to change these tables.\n");
struct inferior_status *inf_status;
int restore_stack_info;
{
- inf_status->pc_changed = pc_changed;
inf_status->stop_signal = stop_signal;
inf_status->stop_pc = stop_pc;
- inf_status->stop_frame_address = stop_frame_address;
inf_status->stop_step = stop_step;
inf_status->stop_stack_dummy = stop_stack_dummy;
inf_status->stopped_by_random_signal = stopped_by_random_signal;
inf_status->step_range_end = step_range_end;
inf_status->step_frame_address = step_frame_address;
inf_status->step_over_calls = step_over_calls;
- inf_status->step_resume_break_address = step_resume_break_address;
inf_status->stop_after_trap = stop_after_trap;
inf_status->stop_soon_quietly = stop_soon_quietly;
/* Save original bpstat chain here; replace it with copy of chain.
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;
{
- FRAME fid;
- int level = inf_status->selected_level;
-
- pc_changed = inf_status->pc_changed;
stop_signal = inf_status->stop_signal;
stop_pc = inf_status->stop_pc;
- stop_frame_address = inf_status->stop_frame_address;
stop_step = inf_status->stop_step;
stop_stack_dummy = inf_status->stop_stack_dummy;
stopped_by_random_signal = inf_status->stopped_by_random_signal;
step_range_end = inf_status->step_range_end;
step_frame_address = inf_status->step_frame_address;
step_over_calls = inf_status->step_over_calls;
- step_resume_break_address = inf_status->step_resume_break_address;
stop_after_trap = inf_status->stop_after_trap;
stop_soon_quietly = inf_status->stop_soon_quietly;
bpstat_clear (&stop_bpstat);
/* 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)
{
- fid = find_relative_frame (get_current_frame (),
- &level);
-
- /* If inf_status->selected_frame_address is NULL, there was no
- previously selected frame. */
- if (fid == 0 ||
- FRAME_FP (fid) != inf_status->selected_frame_address ||
- level != 0)
- {
-#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);
+ 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);
}
}
Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
Pass and Stop may be combined.");
- numsigs = signo_max () + 1;
- signal_stop = (unsigned char *)
- xmalloc (sizeof (signal_stop[0]) * numsigs);
- signal_print = (unsigned char *)
- xmalloc (sizeof (signal_print[0]) * numsigs);
+ 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 = (int)TARGET_SIGNAL_LAST;
+ 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);
+ xmalloc (sizeof (signal_program[0]) * numsigs);
for (i = 0; i < numsigs; i++)
{
signal_stop[i] = 1;
/* Signals caused by debugger's own actions
should not be given to the program afterwards. */
- signal_program[SIGTRAP] = 0;
- signal_program[SIGINT] = 0;
+ signal_program[TARGET_SIGNAL_TRAP] = 0;
+ signal_program[TARGET_SIGNAL_INT] = 0;
/* Signals that are not errors should not normally enter the debugger. */
-#ifdef SIGALRM
- signal_stop[SIGALRM] = 0;
- signal_print[SIGALRM] = 0;
-#endif /* SIGALRM */
-#ifdef SIGVTALRM
- signal_stop[SIGVTALRM] = 0;
- signal_print[SIGVTALRM] = 0;
-#endif /* SIGVTALRM */
-#ifdef SIGPROF
- signal_stop[SIGPROF] = 0;
- signal_print[SIGPROF] = 0;
-#endif /* SIGPROF */
-#ifdef SIGCHLD
- signal_stop[SIGCHLD] = 0;
- signal_print[SIGCHLD] = 0;
-#endif /* SIGCHLD */
-#ifdef SIGCLD
- signal_stop[SIGCLD] = 0;
- signal_print[SIGCLD] = 0;
-#endif /* SIGCLD */
-#ifdef SIGIO
- signal_stop[SIGIO] = 0;
- signal_print[SIGIO] = 0;
-#endif /* SIGIO */
-#ifdef SIGURG
- signal_stop[SIGURG] = 0;
- signal_print[SIGURG] = 0;
-#endif /* SIGURG */
+ signal_stop[TARGET_SIGNAL_ALRM] = 0;
+ signal_print[TARGET_SIGNAL_ALRM] = 0;
+ signal_stop[TARGET_SIGNAL_VTALRM] = 0;
+ signal_print[TARGET_SIGNAL_VTALRM] = 0;
+ signal_stop[TARGET_SIGNAL_PROF] = 0;
+ signal_print[TARGET_SIGNAL_PROF] = 0;
+ signal_stop[TARGET_SIGNAL_CHLD] = 0;
+ signal_print[TARGET_SIGNAL_CHLD] = 0;
+ signal_stop[TARGET_SIGNAL_IO] = 0;
+ signal_print[TARGET_SIGNAL_IO] = 0;
+ signal_stop[TARGET_SIGNAL_POLL] = 0;
+ signal_print[TARGET_SIGNAL_POLL] = 0;
+ signal_stop[TARGET_SIGNAL_URG] = 0;
+ signal_print[TARGET_SIGNAL_URG] = 0;
}