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Diffstat (limited to 'gdb/infrun.c')
| -rw-r--r-- | gdb/infrun.c | 3735 |
1 files changed, 0 insertions, 3735 deletions
diff --git a/gdb/infrun.c b/gdb/infrun.c deleted file mode 100644 index 128ce58..0000000 --- a/gdb/infrun.c +++ /dev/null @@ -1,3735 +0,0 @@ -/* Target-struct-independent code to start (run) and stop an inferior process. - Copyright 1986, 87, 88, 89, 91, 92, 93, 94, 95, 96, 97, 1998 - 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#include "defs.h" -#include "gdb_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 "gdbthread.h" -#include "annotate.h" -#include "symfile.h" /* for overlay functions */ - -#include <signal.h> - -/* Prototypes for local functions */ - -static void signals_info PARAMS ((char *, int)); - -static void handle_command PARAMS ((char *, int)); - -static void sig_print_info PARAMS ((enum target_signal)); - -static void sig_print_header PARAMS ((void)); - -static void resume_cleanups PARAMS ((int)); - -static int hook_stop_stub PARAMS ((PTR)); - -static void delete_breakpoint_current_contents PARAMS ((PTR)); - -int inferior_ignoring_startup_exec_events = 0; -int inferior_ignoring_leading_exec_events = 0; - -#ifdef HPUXHPPA -/* wait_for_inferior and normal_stop use this to notify the user - when the inferior stopped in a different thread than it had been - running in. */ -static int switched_from_inferior_pid; -#endif - -/* resume and wait_for_inferior use this to ensure that when - stepping over a hit breakpoint in a threaded application - only the thread that hit the breakpoint is stepped and the - other threads don't continue. This prevents having another - thread run past the breakpoint while it is temporarily - removed. - - This is not thread-specific, so it isn't saved as part of - the infrun state. - - Versions of gdb which don't use the "step == this thread steps - and others continue" model but instead use the "step == this - thread steps and others wait" shouldn't do this. */ -static int thread_step_needed = 0; - -void _initialize_infrun PARAMS ((void)); - -/* 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 - -/* Dynamic function trampolines are similar to solib trampolines in that they - are between the caller and the callee. The difference is that when you - enter a dynamic trampoline, you can't determine the callee's address. Some - (usually complex) code needs to run in the dynamic trampoline to figure out - the callee's address. This macro is usually called twice. First, when we - enter the trampoline (looks like a normal function call at that point). It - should return the PC of a point within the trampoline where the callee's - address is known. Second, when we hit the breakpoint, this routine returns - the callee's address. At that point, things proceed as per a step resume - breakpoint. */ - -#ifndef DYNAMIC_TRAMPOLINE_NEXTPC -#define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0 -#endif - -/* On SVR4 based systems, determining the callee's address is exceedingly - difficult and depends on the implementation of the run time loader. - If we are stepping at the source level, we single step until we exit - the run time loader code and reach the callee's address. */ - -#ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE -#define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 -#endif - -/* For SVR4 shared libraries, each call goes through a small piece of - trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates - to nonzero if we are current stopped in one of these. */ - -#ifndef IN_SOLIB_CALL_TRAMPOLINE -#define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0 -#endif - -/* In some shared library schemes, the return path from a shared library - call may need to go through a trampoline too. */ - -#ifndef IN_SOLIB_RETURN_TRAMPOLINE -#define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0 -#endif - -/* On MIPS16, a function that returns a floating point value may call - a library helper function to copy the return value to a floating point - register. The IGNORE_HELPER_CALL macro returns non-zero if we - should ignore (i.e. step over) this function call. */ -#ifndef IGNORE_HELPER_CALL -#define IGNORE_HELPER_CALL(pc) 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; - -#define SET_SIGS(nsigs,sigs,flags) \ - do { \ - int signum = (nsigs); \ - while (signum-- > 0) \ - if ((sigs)[signum]) \ - (flags)[signum] = 1; \ - } while (0) - -#define UNSET_SIGS(nsigs,sigs,flags) \ - do { \ - int signum = (nsigs); \ - while (signum-- > 0) \ - if ((sigs)[signum]) \ - (flags)[signum] = 0; \ - } while (0) - - -/* Command list pointer for the "stop" placeholder. */ - -static struct cmd_list_element *stop_command; - -/* Nonzero if breakpoints are now inserted in the inferior. */ - -static int breakpoints_inserted; - -/* Function inferior was in as of last step command. */ - -static struct symbol *step_start_function; - -/* Nonzero if we are expecting a trace trap and should proceed from it. */ - -static int trap_expected; - -#ifdef SOLIB_ADD -/* Nonzero if we want to give control to the user when we're notified - of shared library events by the dynamic linker. */ -static int stop_on_solib_events; -#endif - -#ifdef HP_OS_BUG -/* Nonzero if the next time we try to continue the inferior, it will - step one instruction and generate a spurious trace trap. - This is used to compensate for a bug in HP-UX. */ - -static int trap_expected_after_continue; -#endif - -/* Nonzero means expecting a trace trap - and should stop the inferior and return silently when it happens. */ - -int stop_after_trap; - -/* Nonzero means expecting a trap and caller will handle it themselves. - It is used after attach, due to attaching to a process; - when running in the shell before the child program has been exec'd; - and when running some kinds of remote stuff (FIXME?). */ - -int stop_soon_quietly; - -/* Nonzero if proceed is being used for a "finish" command or a similar - situation when stop_registers should be saved. */ - -int proceed_to_finish; - -/* 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]; - -/* Nonzero if program stopped due to error trying to insert breakpoints. */ - -static int breakpoints_failed; - -/* Nonzero after stop if current stack frame should be printed. */ - -static int stop_print_frame; - -static struct breakpoint *step_resume_breakpoint = NULL; -static struct breakpoint *through_sigtramp_breakpoint = NULL; - -/* On some platforms (e.g., HP-UX), hardware watchpoints have bad - interactions with an inferior that is running a kernel function - (aka, a system call or "syscall"). wait_for_inferior therefore - may have a need to know when the inferior is in a syscall. This - is a count of the number of inferior threads which are known to - currently be running in a syscall. */ -static int number_of_threads_in_syscalls; - -/* This is used to remember when a fork, vfork or exec event - was caught by a catchpoint, and thus the event is to be - followed at the next resume of the inferior, and not - immediately. */ -static struct { - enum target_waitkind kind; - struct { - int parent_pid; - int saw_parent_fork; - int child_pid; - int saw_child_fork; - int saw_child_exec; - } fork_event; - char * execd_pathname; -} pending_follow; - -/* Some platforms don't allow us to do anything meaningful with a - vforked child until it has exec'd. Vforked processes on such - platforms can only be followed after they've exec'd. - - When this is set to 0, a vfork can be immediately followed, - and an exec can be followed merely as an exec. When this is - set to 1, a vfork event has been seen, but cannot be followed - until the exec is seen. - - (In the latter case, inferior_pid is still the parent of the - vfork, and pending_follow.fork_event.child_pid is the child. The - appropriate process is followed, according to the setting of - follow-fork-mode.) */ -static int follow_vfork_when_exec; - -static char * follow_fork_mode_kind_names [] = { -/* ??rehrauer: The "both" option is broken, by what may be a 10.20 - kernel problem. It's also not terribly useful without a GUI to - help the user drive two debuggers. So for now, I'm disabling - the "both" option. - "parent", "child", "both", "ask" }; - */ - "parent", "child", "ask" }; - -static char * follow_fork_mode_string = NULL; - - -#if defined(HPUXHPPA) -static void -follow_inferior_fork (parent_pid, child_pid, has_forked, has_vforked) - int parent_pid; - int child_pid; - int has_forked; - int has_vforked; -{ - int followed_parent = 0; - int followed_child = 0; - int ima_clone = 0; - - /* Which process did the user want us to follow? */ - char * follow_mode = - savestring (follow_fork_mode_string, strlen (follow_fork_mode_string)); - - /* Or, did the user not know, and want us to ask? */ - if (STREQ (follow_fork_mode_string, "ask")) - { - char requested_mode[100]; - - free (follow_mode); - error ("\"ask\" mode NYI"); - follow_mode = savestring (requested_mode, strlen (requested_mode)); - } - - /* If we're to be following the parent, then detach from child_pid. - We're already following the parent, so need do nothing explicit - for it. */ - if (STREQ (follow_mode, "parent")) - { - followed_parent = 1; - - /* We're already attached to the parent, by default. */ - - /* Before detaching from the child, remove all breakpoints from - it. (This won't actually modify the breakpoint list, but will - physically remove the breakpoints from the child.) */ - if (! has_vforked || ! follow_vfork_when_exec) - { - detach_breakpoints (child_pid); - SOLIB_REMOVE_INFERIOR_HOOK (child_pid); - } - - /* Detach from the child. */ - dont_repeat (); - - target_require_detach (child_pid, "", 1); - } - - /* If we're to be following the child, then attach to it, detach - from inferior_pid, and set inferior_pid to child_pid. */ - else if (STREQ (follow_mode, "child")) - { - char child_pid_spelling [100]; /* Arbitrary length. */ - - followed_child = 1; - - /* Before detaching from the parent, detach all breakpoints from - the child. But only if we're forking, or if we follow vforks - as soon as they happen. (If we're following vforks only when - the child has exec'd, then it's very wrong to try to write - back the "shadow contents" of inserted breakpoints now -- they - belong to the child's pre-exec'd a.out.) */ - if (! has_vforked || ! follow_vfork_when_exec) - { - detach_breakpoints (child_pid); - } - - /* Before detaching from the parent, remove all breakpoints from it. */ - remove_breakpoints (); - - /* Also reset the solib inferior hook from the parent. */ - SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid); - - /* Detach from the parent. */ - dont_repeat (); - target_detach (NULL, 1); - - /* Attach to the child. */ - inferior_pid = child_pid; - sprintf (child_pid_spelling, "%d", child_pid); - dont_repeat (); - - target_require_attach (child_pid_spelling, 1); - - /* Was there a step_resume breakpoint? (There was if the user - did a "next" at the fork() call.) If so, explicitly reset its - thread number. - - step_resumes are a form of bp that are made to be per-thread. - Since we created the step_resume bp when the parent process - was being debugged, and now are switching to the child process, - from the breakpoint package's viewpoint, that's a switch of - "threads". We must update the bp's notion of which thread - it is for, or it'll be ignored when it triggers... */ - if (step_resume_breakpoint && - (! has_vforked || ! follow_vfork_when_exec)) - breakpoint_re_set_thread (step_resume_breakpoint); - - /* Reinsert all breakpoints in the child. (The user may've set - breakpoints after catching the fork, in which case those - actually didn't get set in the child, but only in the parent.) */ - if (! has_vforked || ! follow_vfork_when_exec) - { - breakpoint_re_set (); - insert_breakpoints (); - } - } - - /* If we're to be following both parent and child, then fork ourselves, - and attach the debugger clone to the child. */ - else if (STREQ (follow_mode, "both")) - { - char pid_suffix [100]; /* Arbitrary length. */ - - /* Clone ourselves to follow the child. This is the end of our - involvement with child_pid; our clone will take it from here... */ - dont_repeat (); - target_clone_and_follow_inferior (child_pid, &followed_child); - followed_parent = !followed_child; - - /* We continue to follow the parent. To help distinguish the two - debuggers, though, both we and our clone will reset our prompts. */ - sprintf (pid_suffix, "[%d] ", inferior_pid); - set_prompt (strcat (get_prompt (), pid_suffix)); - } - - /* The parent and child of a vfork share the same address space. - Also, on some targets the order in which vfork and exec events - are received for parent in child requires some delicate handling - of the events. - - For instance, on ptrace-based HPUX we receive the child's vfork - event first, at which time the parent has been suspended by the - OS and is essentially untouchable until the child's exit or second - exec event arrives. At that time, the parent's vfork event is - delivered to us, and that's when we see and decide how to follow - the vfork. But to get to that point, we must continue the child - until it execs or exits. To do that smoothly, all breakpoints - must be removed from the child, in case there are any set between - the vfork() and exec() calls. But removing them from the child - also removes them from the parent, due to the shared-address-space - nature of a vfork'd parent and child. On HPUX, therefore, we must - take care to restore the bp's to the parent before we continue it. - Else, it's likely that we may not stop in the expected place. (The - worst scenario is when the user tries to step over a vfork() call; - the step-resume bp must be restored for the step to properly stop - in the parent after the call completes!) - - Sequence of events, as reported to gdb from HPUX: - - Parent Child Action for gdb to take - ------------------------------------------------------- - 1 VFORK Continue child - 2 EXEC - 3 EXEC or EXIT - 4 VFORK */ - if (has_vforked) - { - target_post_follow_vfork (parent_pid, - followed_parent, - child_pid, - followed_child); - } - - pending_follow.fork_event.saw_parent_fork = 0; - pending_follow.fork_event.saw_child_fork = 0; - - free (follow_mode); -} - -static void -follow_fork (parent_pid, child_pid) - int parent_pid; - int child_pid; -{ - follow_inferior_fork (parent_pid, child_pid, 1, 0); -} - - -/* Forward declaration. */ -static void follow_exec PARAMS((int, char *)); - -static void -follow_vfork (parent_pid, child_pid) - int parent_pid; - int child_pid; -{ - follow_inferior_fork (parent_pid, child_pid, 0, 1); - - /* Did we follow the child? Had it exec'd before we saw the parent vfork? */ - if (pending_follow.fork_event.saw_child_exec && (inferior_pid == child_pid)) - { - pending_follow.fork_event.saw_child_exec = 0; - pending_follow.kind = TARGET_WAITKIND_SPURIOUS; - follow_exec (inferior_pid, pending_follow.execd_pathname); - free (pending_follow.execd_pathname); - } -} -#endif /* HPUXHPPA */ - -static void -follow_exec (pid, execd_pathname) - int pid; - char * execd_pathname; -{ -#ifdef HPUXHPPA - int saved_pid = pid; - extern struct target_ops child_ops; - - /* Did this exec() follow a vfork()? If so, we must follow the - vfork now too. Do it before following the exec. */ - if (follow_vfork_when_exec && - (pending_follow.kind == TARGET_WAITKIND_VFORKED)) - { - pending_follow.kind = TARGET_WAITKIND_SPURIOUS; - follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); - follow_vfork_when_exec = 0; - saved_pid = inferior_pid; - - /* Did we follow the parent? If so, we're done. If we followed - the child then we must also follow its exec(). */ - if (inferior_pid == pending_follow.fork_event.parent_pid) - return; - } - - /* This is an exec event that we actually wish to pay attention to. - Refresh our symbol table to the newly exec'd program, remove any - momentary bp's, etc. - - If there are breakpoints, they aren't really inserted now, - since the exec() transformed our inferior into a fresh set - of instructions. - - We want to preserve symbolic breakpoints on the list, since - we have hopes that they can be reset after the new a.out's - symbol table is read. - - However, any "raw" breakpoints must be removed from the list - (e.g., the solib bp's), since their address is probably invalid - now. - - And, we DON'T want to call delete_breakpoints() here, since - that may write the bp's "shadow contents" (the instruction - value that was overwritten witha TRAP instruction). Since - we now have a new a.out, those shadow contents aren't valid. */ - update_breakpoints_after_exec (); - - /* If there was one, it's gone now. We cannot truly step-to-next - statement through an exec(). */ - step_resume_breakpoint = NULL; - step_range_start = 0; - step_range_end = 0; - - /* If there was one, it's gone now. */ - through_sigtramp_breakpoint = NULL; - - /* What is this a.out's name? */ - printf_unfiltered ("Executing new program: %s\n", execd_pathname); - - /* We've followed the inferior through an exec. Therefore, the - inferior has essentially been killed & reborn. */ - gdb_flush (gdb_stdout); - target_mourn_inferior (); - inferior_pid = saved_pid; /* Because mourn_inferior resets inferior_pid. */ - push_target (&child_ops); - - /* That a.out is now the one to use. */ - exec_file_attach (execd_pathname, 0); - - /* And also is where symbols can be found. */ - symbol_file_command (execd_pathname, 0); - - /* Reset the shared library package. This ensures that we get - a shlib event when the child reaches "_start", at which point - the dld will have had a chance to initialize the child. */ - SOLIB_RESTART (); - SOLIB_CREATE_INFERIOR_HOOK (inferior_pid); - - /* Reinsert all breakpoints. (Those which were symbolic have - been reset to the proper address in the new a.out, thanks - to symbol_file_command...) */ - insert_breakpoints (); - - /* The next resume of this inferior should bring it to the shlib - startup breakpoints. (If the user had also set bp's on - "main" from the old (parent) process, then they'll auto- - matically get reset there in the new process.) */ -#endif -} - -/* Non-zero if we just simulating a single-step. This is needed - because we cannot remove the breakpoints in the inferior process - until after the `wait' in `wait_for_inferior'. */ -static int singlestep_breakpoints_inserted_p = 0; - - -/* Things to clean up if we QUIT out of resume (). */ -/* ARGSUSED */ -static void -resume_cleanups (arg) - int arg; -{ - normal_stop (); -} - -static char schedlock_off[] = "off"; -static char schedlock_on[] = "on"; -static char schedlock_step[] = "step"; -static char *scheduler_mode = schedlock_off; -static char *scheduler_enums[] = {schedlock_off, schedlock_on, schedlock_step}; - -static void -set_schedlock_func (args, from_tty, c) - char *args; - int from_tty; - struct cmd_list_element *c; -{ - if (c->type == set_cmd) - if (!target_can_lock_scheduler) - { - scheduler_mode = schedlock_off; - error ("Target '%s' cannot support this command.", - target_shortname); - } -} - - -/* 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; - enum target_signal sig; -{ - int should_resume = 1; - struct cleanup *old_cleanups = make_cleanup ((make_cleanup_func) - 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 - - if (SOFTWARE_SINGLE_STEP_P && step) - { - /* Do it the hard way, w/temp breakpoints */ - SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints*/); - /* ...and don't ask hardware to do it. */ - step = 0; - /* and do not pull these breakpoints until after a `wait' in - `wait_for_inferior' */ - singlestep_breakpoints_inserted_p = 1; - } - - /* Handle any optimized stores to the inferior NOW... */ -#ifdef DO_DEFERRED_STORES - DO_DEFERRED_STORES; -#endif - -#ifdef HPUXHPPA - /* If there were any forks/vforks/execs that were caught and are - now to be followed, then do so. */ - switch (pending_follow.kind) - { - case (TARGET_WAITKIND_FORKED): - pending_follow.kind = TARGET_WAITKIND_SPURIOUS; - follow_fork (inferior_pid, pending_follow.fork_event.child_pid); - break; - - case (TARGET_WAITKIND_VFORKED): - { - int saw_child_exec = pending_follow.fork_event.saw_child_exec; - - pending_follow.kind = TARGET_WAITKIND_SPURIOUS; - follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); - - /* Did we follow the child, but not yet see the child's exec event? - If so, then it actually ought to be waiting for us; we respond to - parent vfork events. We don't actually want to resume the child - in this situation; we want to just get its exec event. */ - if (! saw_child_exec && - (inferior_pid == pending_follow.fork_event.child_pid)) - should_resume = 0; - } - break; - - case (TARGET_WAITKIND_EXECD): - /* If we saw a vfork event but couldn't follow it until we saw - an exec, then now might be the time! */ - pending_follow.kind = TARGET_WAITKIND_SPURIOUS; - /* follow_exec is called as soon as the exec event is seen. */ - break; - - default: - break; - } -#endif /* HPUXHPPA */ - - /* Install inferior's terminal modes. */ - target_terminal_inferior (); - - if (should_resume) - { -#ifdef HPUXHPPA - if (thread_step_needed) - { - /* We stopped on a BPT instruction; - don't continue other threads and - just step this thread. */ - thread_step_needed = 0; - - if (!breakpoint_here_p(read_pc())) - { - /* Breakpoint deleted: ok to do regular resume - where all the threads either step or continue. */ - target_resume (-1, step, sig); - } - else - { - if (!step) - { - warning ( "Internal error, changing continue to step." ); - remove_breakpoints (); - breakpoints_inserted = 0; - trap_expected = 1; - step = 1; - } - - target_resume (inferior_pid, step, sig); - } - } - else -#endif /* HPUXHPPA */ - { - /* Vanilla resume. */ - - if ((scheduler_mode == schedlock_on) || - (scheduler_mode == schedlock_step && step != 0)) - target_resume (inferior_pid, step, sig); - else - target_resume (-1, step, sig); - } - } - - discard_cleanups (old_cleanups); -} - - -/* Clear out all variables saying what to do when inferior is continued. - First do this, then set the ones you want, then call `proceed'. */ - -void -clear_proceed_status () -{ - trap_expected = 0; - step_range_start = 0; - step_range_end = 0; - step_frame_address = 0; - step_over_calls = -1; - stop_after_trap = 0; - stop_soon_quietly = 0; - proceed_to_finish = 0; - breakpoint_proceeded = 1; /* We're about to proceed... */ - - /* 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. - 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 probably set various step_... variables - before calling here, if you are stepping. - - You should call clear_proceed_status before calling proceed. */ - -void -proceed (addr, siggnal, step) - CORE_ADDR addr; - enum target_signal siggnal; - int step; -{ - int oneproc = 0; - - if (step > 0) - step_start_function = find_pc_function (read_pc ()); - if (step < 0) - stop_after_trap = 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 (and report a second - hit at this breakpoint). */ - - if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) - oneproc = 1; - -#ifndef STEP_SKIPS_DELAY -#define STEP_SKIPS_DELAY(pc) (0) -#define STEP_SKIPS_DELAY_P (0) -#endif - /* 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 (STEP_SKIPS_DELAY_P - && breakpoint_here_p (read_pc () + 4) - && STEP_SKIPS_DELAY (read_pc ())) - oneproc = 1; - } - else - { - write_pc (addr); - - /* New address; we don't need to single-step a thread - over a breakpoint we just hit, 'cause we aren't - continuing from there. - - It's not worth worrying about the case where a user - asks for a "jump" at the current PC--if they get the - hiccup of re-hiting a hit breakpoint, what else do - they expect? */ - thread_step_needed = 0; - } - -#ifdef PREPARE_TO_PROCEED - /* In a multi-threaded task we may select another thread - and then continue or step. - - But if the old thread was stopped at a breakpoint, it - will immediately cause another breakpoint stop without - any execution (i.e. it will report a breakpoint hit - incorrectly). So we must step over it first. - - PREPARE_TO_PROCEED checks the current thread against the thread - that reported the most recent event. If a step-over is required - it returns TRUE and sets the current thread to the old thread. */ - if (PREPARE_TO_PROCEED() && breakpoint_here_p (read_pc())) - { - oneproc = 1; - thread_step_needed = 1; - } - -#endif /* PREPARE_TO_PROCEED */ - -#ifdef HP_OS_BUG - if (trap_expected_after_continue) - { - /* If (step == 0), a trap will be automatically generated after - the first instruction is executed. Force step one - instruction to clear this condition. This should not occur - if step is nonzero, but it is harmless in that case. */ - oneproc = 1; - trap_expected_after_continue = 0; - } -#endif /* HP_OS_BUG */ - - if (oneproc) - /* We will get a trace trap after one instruction. - Continue it automatically and insert breakpoints then. */ - trap_expected = 1; - else - { - int temp = insert_breakpoints (); - if (temp) - { - print_sys_errmsg ("ptrace", temp); - error ("Cannot insert breakpoints.\n\ -The same program may be running in another process."); - } - - breakpoints_inserted = 1; - } - - 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 (!signal_program[stop_signal]) - stop_signal = TARGET_SIGNAL_0; - - annotate_starting (); - - /* Make sure that output from GDB appears before output from the - inferior. */ - gdb_flush (gdb_stdout); - - /* Resume inferior. */ - 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. */ - - 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_func_start; -static char *prev_func_name; - - -/* Start remote-debugging of a machine over a serial link. */ - -void -start_remote () -{ - init_thread_list (); - init_wait_for_inferior (); - stop_soon_quietly = 1; - trap_expected = 0; - wait_for_inferior (); - normal_stop (); -} - -/* Initialize static vars when a new inferior begins. */ - -void -init_wait_for_inferior () -{ - /* These are meaningless until the first time through wait_for_inferior. */ - prev_pc = 0; - prev_func_start = 0; - prev_func_name = NULL; - -#ifdef HP_OS_BUG - trap_expected_after_continue = 0; -#endif - breakpoints_inserted = 0; - breakpoint_init_inferior (inf_starting); - - /* Don't confuse first call to proceed(). */ - stop_signal = TARGET_SIGNAL_0; - - /* The first resume is not following a fork/vfork/exec. */ - pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ - pending_follow.fork_event.saw_parent_fork = 0; - pending_follow.fork_event.saw_child_fork = 0; - pending_follow.fork_event.saw_child_exec = 0; - - /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ - number_of_threads_in_syscalls = 0; - - clear_proceed_status (); -} - -static void -delete_breakpoint_current_contents (arg) - PTR arg; -{ - struct breakpoint **breakpointp = (struct breakpoint **)arg; - if (*breakpointp != NULL) - { - delete_breakpoint (*breakpointp); - *breakpointp = NULL; - } -} - -/* Wait for control to return from inferior to debugger. - If inferior gets a signal, we may decide to start it up again - instead of returning. That is why there is a loop in this function. - When this function actually returns it means the inferior - should be left stopped and GDB should read more commands. */ - -void -wait_for_inferior () -{ - struct cleanup *old_cleanups; - struct target_waitstatus w; - int another_trap; - int random_signal = 0; - CORE_ADDR stop_func_start; - CORE_ADDR stop_func_end; - char *stop_func_name; -#if 0 - CORE_ADDR prologue_pc = 0; -#endif - CORE_ADDR 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 */ - int pid; - int saved_inferior_pid; - int update_step_sp = 0; - int stepping_through_solib_after_catch = 0; - bpstat stepping_through_solib_catchpoints = NULL; - int enable_hw_watchpoints_after_wait = 0; - int stepping_through_sigtramp = 0; - int new_thread_event; - -#ifdef HAVE_NONSTEPPABLE_WATCHPOINT - int stepped_after_stopped_by_watchpoint; -#endif - - 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)) \ - || stepping_through_solib_after_catch \ - || bpstat_should_step ()) - ; - thread_step_needed = 0; - -#ifdef HPUXHPPA - /* We'll update this if & when we switch to a new thread. */ - switched_from_inferior_pid = inferior_pid; -#endif - - while (1) - { - extern int overlay_cache_invalid; /* declared in symfile.h */ - - overlay_cache_invalid = 1; - - /* 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 (); - - if (target_wait_hook) - pid = target_wait_hook (-1, &w); - else - pid = target_wait (-1, &w); - - /* Since we've done a wait, we have a new event. Don't carry - over any expectations about needing to step over a - breakpoint. */ - thread_step_needed = 0; - - /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event is - serviced in this loop, below. */ - if (enable_hw_watchpoints_after_wait) - { - TARGET_ENABLE_HW_WATCHPOINTS(inferior_pid); - enable_hw_watchpoints_after_wait = 0; - } - - -#ifdef HAVE_NONSTEPPABLE_WATCHPOINT -stepped_after_stopped_by_watchpoint = 0; -#endif - - /* Gross. - - We goto this label from elsewhere in wait_for_inferior when we want - to continue the main loop without calling "wait" and trashing the - waitstatus contained in W. */ - have_waited: - - flush_cached_frames (); - - /* If it's a new process, add it to the thread database */ - - new_thread_event = ((pid != inferior_pid) && !in_thread_list (pid)); - - if (w.kind != TARGET_WAITKIND_EXITED - && w.kind != TARGET_WAITKIND_SIGNALLED - && new_thread_event) - { - add_thread (pid); - - -#ifdef HPUXHPPA - fprintf_unfiltered (gdb_stderr, "[New %s]\n", - target_pid_or_tid_to_str (pid)); - -#else - printf_filtered ("[New %s]\n", target_pid_to_str (pid)); -#endif - -#if 0 - /* NOTE: This block is ONLY meant to be invoked in case of a - "thread creation event"! If it is invoked for any other - sort of event (such as a new thread landing on a breakpoint), - the event will be discarded, which is almost certainly - a bad thing! - - To avoid this, the low-level module (eg. target_wait) - should call in_thread_list and add_thread, so that the - new thread is known by the time we get here. */ - - /* 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; -#endif - } - - switch (w.kind) - { - case TARGET_WAITKIND_LOADED: - /* Ignore gracefully during startup of the inferior, as it - might be the shell which has just loaded some objects, - otherwise add the symbols for the newly loaded objects. */ -#ifdef SOLIB_ADD - if (!stop_soon_quietly) - { - extern int auto_solib_add; - - /* Remove breakpoints, SOLIB_ADD might adjust - breakpoint addresses via breakpoint_re_set. */ - if (breakpoints_inserted) - remove_breakpoints (); - - /* Check for any newly added shared libraries if we're - supposed to be adding them automatically. */ - if (auto_solib_add) - { - /* Switch terminal for any messages produced by - breakpoint_re_set. */ - target_terminal_ours_for_output (); - SOLIB_ADD (NULL, 0, NULL); - target_terminal_inferior (); - } - - /* Reinsert breakpoints and continue. */ - if (breakpoints_inserted) - insert_breakpoints (); - } -#endif - 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 */ - annotate_exited (w.value.integer); - if (w.value.integer) - printf_filtered ("\nProgram exited with code 0%o.\n", - (unsigned int)w.value.integer); - else - printf_filtered ("\nProgram exited normally.\n"); - - /* Record the exit code in the convenience variable $_exitcode, so - that the user can inspect this again later. */ - set_internalvar (lookup_internalvar ("_exitcode"), - value_from_longest (builtin_type_int, - (LONGEST) w.value.integer)); - gdb_flush (gdb_stdout); - target_mourn_inferior (); - singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P*/ - stop_print_frame = 0; - goto stop_stepping; - - case TARGET_WAITKIND_SIGNALLED: - stop_print_frame = 0; - stop_signal = w.value.sig; - target_terminal_ours (); /* Must do this before mourn anyway */ - annotate_signalled (); - - /* This looks pretty bogus to me. Doesn't TARGET_WAITKIND_SIGNALLED - mean it is already dead? This has been here since GDB 2.8, so - perhaps it means rms didn't understand unix waitstatuses? - For the moment I'm just kludging around this in remote.c - rather than trying to change it here --kingdon, 5 Dec 1994. */ - target_kill (); /* kill mourns as well */ - - 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); - singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P*/ - goto stop_stepping; - - /* The following are the only cases in which we keep going; - the above cases end in a continue or goto. */ - case TARGET_WAITKIND_FORKED: - stop_signal = TARGET_SIGNAL_TRAP; - pending_follow.kind = w.kind; - - /* Ignore fork events reported for the parent; we're only - interested in reacting to forks of the child. Note that - we expect the child's fork event to be available if we - waited for it now. */ - if (inferior_pid == pid) - { - pending_follow.fork_event.saw_parent_fork = 1; - pending_follow.fork_event.parent_pid = pid; - pending_follow.fork_event.child_pid = w.value.related_pid; - continue; - } - else - { - pending_follow.fork_event.saw_child_fork = 1; - pending_follow.fork_event.child_pid = pid; - pending_follow.fork_event.parent_pid = w.value.related_pid; - } - - stop_pc = read_pc_pid (pid); - saved_inferior_pid = inferior_pid; - inferior_pid = pid; - stop_bpstat = bpstat_stop_status - (&stop_pc, -#if DECR_PC_AFTER_BREAK - (prev_pc != stop_pc - DECR_PC_AFTER_BREAK - && CURRENTLY_STEPPING ()) -#else /* DECR_PC_AFTER_BREAK zero */ - 0 -#endif /* DECR_PC_AFTER_BREAK zero */ - ); - random_signal = ! bpstat_explains_signal (stop_bpstat); - inferior_pid = saved_inferior_pid; - goto process_event_stop_test; - - /* If this a platform which doesn't allow a debugger to touch a - vfork'd inferior until after it exec's, then we'd best keep - our fingers entirely off the inferior, other than continuing - it. This has the unfortunate side-effect that catchpoints - of vforks will be ignored. But since the platform doesn't - allow the inferior be touched at vfork time, there's really - little choice. */ - case TARGET_WAITKIND_VFORKED: - stop_signal = TARGET_SIGNAL_TRAP; - pending_follow.kind = w.kind; - - /* Is this a vfork of the parent? If so, then give any - vfork catchpoints a chance to trigger now. (It's - dangerous to do so if the child canot be touched until - it execs, and the child has not yet exec'd. We probably - should warn the user to that effect when the catchpoint - triggers...) */ - if (pid == inferior_pid) - { - pending_follow.fork_event.saw_parent_fork = 1; - pending_follow.fork_event.parent_pid = pid; - pending_follow.fork_event.child_pid = w.value.related_pid; - } - - /* If we've seen the child's vfork event but cannot really touch - the child until it execs, then we must continue the child now. - Else, give any vfork catchpoints a chance to trigger now. */ - else - { - pending_follow.fork_event.saw_child_fork = 1; - pending_follow.fork_event.child_pid = pid; - pending_follow.fork_event.parent_pid = w.value.related_pid; - target_post_startup_inferior (pending_follow.fork_event.child_pid); - follow_vfork_when_exec = ! target_can_follow_vfork_prior_to_exec (); - if (follow_vfork_when_exec) - { - target_resume (pid, 0, TARGET_SIGNAL_0); - continue; - } - } - - stop_pc = read_pc (); - stop_bpstat = bpstat_stop_status - (&stop_pc, -#if DECR_PC_AFTER_BREAK - (prev_pc != stop_pc - DECR_PC_AFTER_BREAK - && CURRENTLY_STEPPING ()) -#else /* DECR_PC_AFTER_BREAK zero */ - 0 -#endif /* DECR_PC_AFTER_BREAK zero */ - ); - random_signal = ! bpstat_explains_signal (stop_bpstat); - goto process_event_stop_test; - - case TARGET_WAITKIND_EXECD: - stop_signal = TARGET_SIGNAL_TRAP; - - /* Is this a target which reports multiple exec events per actual - call to exec()? (HP-UX using ptrace does, for example.) If so, - ignore all but the last one. Just resume the exec'r, and wait - for the next exec event. */ - if (inferior_ignoring_leading_exec_events) - { - inferior_ignoring_leading_exec_events--; - if (pending_follow.kind == TARGET_WAITKIND_VFORKED) - ENSURE_VFORKING_PARENT_REMAINS_STOPPED(pending_follow.fork_event.parent_pid); - target_resume (pid, 0, TARGET_SIGNAL_0); - continue; - } - inferior_ignoring_leading_exec_events = - target_reported_exec_events_per_exec_call () - 1; - - pending_follow.execd_pathname = savestring (w.value.execd_pathname, - strlen (w.value.execd_pathname)); - - /* Did inferior_pid exec, or did a (possibly not-yet-followed) - child of a vfork exec? - - ??rehrauer: This is unabashedly an HP-UX specific thing. On - HP-UX, events associated with a vforking inferior come in - threes: a vfork event for the child (always first), followed - a vfork event for the parent and an exec event for the child. - The latter two can come in either order. - - If we get the parent vfork event first, life's good: We follow - either the parent or child, and then the child's exec event is - a "don't care". - - But if we get the child's exec event first, then we delay - responding to it until we handle the parent's vfork. Because, - otherwise we can't satisfy a "catch vfork". */ - if (pending_follow.kind == TARGET_WAITKIND_VFORKED) - { - pending_follow.fork_event.saw_child_exec = 1; - - /* On some targets, the child must be resumed before - the parent vfork event is delivered. A single-step - suffices. */ - if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK()) - target_resume (pid, 1, TARGET_SIGNAL_0); - /* We expect the parent vfork event to be available now. */ - continue; - } - - /* This causes the eventpoints and symbol table to be reset. Must - do this now, before trying to determine whether to stop. */ - follow_exec (inferior_pid, pending_follow.execd_pathname); - free (pending_follow.execd_pathname); - - stop_pc = read_pc_pid (pid); - saved_inferior_pid = inferior_pid; - inferior_pid = pid; - stop_bpstat = bpstat_stop_status - (&stop_pc, -#if DECR_PC_AFTER_BREAK - (prev_pc != stop_pc - DECR_PC_AFTER_BREAK - && CURRENTLY_STEPPING ()) -#else /* DECR_PC_AFTER_BREAK zero */ - 0 -#endif /* DECR_PC_AFTER_BREAK zero */ - ); - random_signal = ! bpstat_explains_signal (stop_bpstat); - inferior_pid = saved_inferior_pid; - goto process_event_stop_test; - - /* These syscall events are returned on HP-UX, as part of its - implementation of page-protection-based "hardware" watchpoints. - HP-UX has unfortunate interactions between page-protections and - some system calls. Our solution is to disable hardware watches - when a system call is entered, and reenable them when the syscall - completes. The downside of this is that we may miss the precise - point at which a watched piece of memory is modified. "Oh well." - - Note that we may have multiple threads running, which may each - enter syscalls at roughly the same time. Since we don't have a - good notion currently of whether a watched piece of memory is - thread-private, we'd best not have any page-protections active - when any thread is in a syscall. Thus, we only want to reenable - hardware watches when no threads are in a syscall. - - Also, be careful not to try to gather much state about a thread - that's in a syscall. It's frequently a losing proposition. */ - case TARGET_WAITKIND_SYSCALL_ENTRY: - number_of_threads_in_syscalls++; - if (number_of_threads_in_syscalls == 1) - { - TARGET_DISABLE_HW_WATCHPOINTS(inferior_pid); - } - resume (0, TARGET_SIGNAL_0); - continue; - - /* Before examining the threads further, step this thread to - get it entirely out of the syscall. (We get notice of the - event when the thread is just on the verge of exiting a - syscall. Stepping one instruction seems to get it back - into user code.) - - Note that although the logical place to reenable h/w watches - is here, we cannot. We cannot reenable them before stepping - the thread (this causes the next wait on the thread to hang). - - Nor can we enable them after stepping until we've done a wait. - Thus, we simply set the flag enable_hw_watchpoints_after_wait - here, which will be serviced immediately after the target - is waited on. */ - case TARGET_WAITKIND_SYSCALL_RETURN: - target_resume (pid, 1, TARGET_SIGNAL_0); - - if (number_of_threads_in_syscalls > 0) - { - number_of_threads_in_syscalls--; - enable_hw_watchpoints_after_wait = - (number_of_threads_in_syscalls == 0); - } - continue; - - case TARGET_WAITKIND_STOPPED: - stop_signal = w.value.sig; - break; - } - - /* 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. */ - if (new_thread_event) - { - target_resume (-1, 0, TARGET_SIGNAL_0); - continue; - } - - 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) - { - if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) - random_signal = 0; - else - if (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)) - { - int remove_status; - - /* Saw a breakpoint, but it was hit by the wrong thread. - Just continue. */ - write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, pid); - - remove_status = remove_breakpoints (); - /* Did we fail to remove breakpoints? If so, try - to set the PC past the bp. (There's at least - one situation in which we can fail to remove - the bp's: On HP-UX's that use ttrace, we can't - change the address space of a vforking child - process until the child exits (well, okay, not - then either :-) or execs. */ - if (remove_status != 0) - { - write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, pid); - } - else - { /* Single step */ - target_resume (pid, 1, TARGET_SIGNAL_0); - /* 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 (); - } - - /* We need to restart all the threads now. */ - target_resume (-1, 0, TARGET_SIGNAL_0); - continue; - } - else - { - /* This breakpoint matches--either it is the right - thread or it's a generic breakpoint for all threads. - Remember that we'll need to step just _this_ thread - on any following user continuation! */ - thread_step_needed = 1; - } - } - } - 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. - - Note that if there's any kind of pending follow (i.e., of a fork, - vfork or exec), we don't want to do this now. Rather, we'll let - the next resume handle it. */ - if ((pid != inferior_pid) && - (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) - { - 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]) - { -/* ??rehrauer: I don't understand the rationale for this code. If the - inferior will stop as a result of this signal, then the act of handling - the stop ought to print a message that's couches the stoppage in user - terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior - won't stop as a result of the signal -- i.e., if the signal is merely - a side-effect of something GDB's doing "under the covers" for the - user, such as stepping threads over a breakpoint they shouldn't stop - for -- then the message seems to be a serious annoyance at best. - - For now, remove the message altogether. */ -#if 0 - 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); -#endif - } - - /* 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(). */ - - /* Save infrun state for the old thread. */ - save_infrun_state (inferior_pid, prev_pc, - prev_func_start, prev_func_name, - trap_expected, step_resume_breakpoint, - through_sigtramp_breakpoint, - step_range_start, step_range_end, - step_frame_address, handling_longjmp, - another_trap, - stepping_through_solib_after_catch, - stepping_through_solib_catchpoints, - stepping_through_sigtramp); - -#ifdef HPUXHPPA - switched_from_inferior_pid = inferior_pid; -#endif - - inferior_pid = pid; - - /* Load infrun state for the new thread. */ - load_infrun_state (inferior_pid, &prev_pc, - &prev_func_start, &prev_func_name, - &trap_expected, &step_resume_breakpoint, - &through_sigtramp_breakpoint, - &step_range_start, &step_range_end, - &step_frame_address, &handling_longjmp, - &another_trap, - &stepping_through_solib_after_catch, - &stepping_through_solib_catchpoints, - &stepping_through_sigtramp); - - if (context_hook) - context_hook (pid_to_thread_id (pid)); - - printf_filtered ("[Switching to %s]\n", target_pid_to_str (pid)); - flush_cached_frames (); - } - - if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) - { - /* Pull the single step breakpoints out of the target. */ - SOFTWARE_SINGLE_STEP (0, 0); - singlestep_breakpoints_inserted_p = 0; - } - - /* 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 0 /* XXX DEBUG */ - printf ("infrun.c:1607: pc = 0x%x\n", read_pc ()); -#endif - /* if (INSTRUCTION_NULLIFIED && CURRENTLY_STEPPING ()) */ - if (INSTRUCTION_NULLIFIED) - { - struct target_waitstatus tmpstatus; -#if 0 - all_registers_info ((char *)0, 0); -#endif - registers_changed (); - target_resume (pid, 1, TARGET_SIGNAL_0); - - /* We may have received a signal that we want to pass to - the inferior; therefore, we must not clobber the waitstatus - in W. So we call wait ourselves, then continue the loop - at the "have_waited" label. */ - if (target_wait_hook) - target_wait_hook (pid, &tmpstatus); - else - target_wait (pid, &tmpstatus); - - goto have_waited; - } - -#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)) - { -/* At this point, we are stopped at an instruction which has attempted to write - to a piece of memory under control of a watchpoint. The instruction hasn't - actually executed yet. If we were to evaluate the watchpoint expression - now, we would get the old value, and therefore no change would seem to have - occurred. - - In order to make watchpoints work `right', we really need to complete the - memory write, and then evaluate the watchpoint expression. The following - code does that by removing the watchpoint (actually, all watchpoints and - breakpoints), single-stepping the target, re-inserting watchpoints, and then - falling through to let normal single-step processing handle proceed. Since - this includes evaluating watchpoints, things will come to a stop in the - correct manner. */ - - write_pc (stop_pc - DECR_PC_AFTER_BREAK); - - remove_breakpoints (); - registers_changed(); - target_resume (pid, 1, TARGET_SIGNAL_0); /* Single step */ - - if (target_wait_hook) - target_wait_hook (pid, &w); - else - target_wait (pid, &w); - insert_breakpoints (); - - /* FIXME-maybe: is this cleaner than setting a flag? Does it - handle things like signals arriving and other things happening - in combination correctly? */ - stepped_after_stopped_by_watchpoint = 1; - goto have_waited; - } -#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_end = 0; - stop_func_name = 0; - /* Don't care about return value; stop_func_start and stop_func_name - will both be 0 if it doesn't work. */ - find_pc_partial_function (stop_pc, &stop_func_name, &stop_func_start, - &stop_func_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; - 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. */ - - /* 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 == TARGET_SIGNAL_TRAP - || (breakpoints_inserted && - (stop_signal == TARGET_SIGNAL_ILL - || stop_signal == TARGET_SIGNAL_EMT - )) - || stop_soon_quietly) - { - if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) - { - stop_print_frame = 0; - break; - } - if (stop_soon_quietly) - break; - - /* Don't even think about breakpoints - if just proceeded over a breakpoint. - - However, if we are trying to proceed over a breakpoint - and end up in sigtramp, then through_sigtramp_breakpoint - will be set and we should check whether we've hit the - step breakpoint. */ - 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, - (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 - and 3) we didn't hit a breakpoint in a signal handler - without an intervening stop in sigtramp, which is - detected by a new stack pointer value below - any usual function calling stack adjustments. */ - (CURRENTLY_STEPPING () - && prev_pc != stop_pc - DECR_PC_AFTER_BREAK - && !(step_range_end - && INNER_THAN (read_sp (), (step_sp - 16)))) : - 0) - ); - /* Following in case break condition called a - function. */ - stop_print_frame = 1; - } - - if (stop_signal == TARGET_SIGNAL_TRAP) - random_signal - = !(bpstat_explains_signal (stop_bpstat) - || trap_expected -#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) - /* 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, read_sp (), - FRAME_FP (get_current_frame ())) -#endif /* No CALL_DUMMY_BREAKPOINT_OFFSET. */ - ); - if (!random_signal) - stop_signal = TARGET_SIGNAL_TRAP; - } - } - - /* When we reach this point, we've pretty much decided - that the reason for stopping must've been a random - (unexpected) signal. */ - - else - random_signal = 1; - /* If a fork, vfork or exec event was seen, then there are two - possible responses we can make: - - 1. If a catchpoint triggers for the event (random_signal == 0), - then we must stop now and issue a prompt. We will resume - the inferior when the user tells us to. - 2. If no catchpoint triggers for the event (random_signal == 1), - then we must resume the inferior now and keep checking. - - In either case, we must take appropriate steps to "follow" the - the fork/vfork/exec when the inferior is resumed. For example, - if follow-fork-mode is "child", then we must detach from the - parent inferior and follow the new child inferior. - - In either case, setting pending_follow causes the next resume() - to take the appropriate following action. */ -process_event_stop_test: - if (w.kind == TARGET_WAITKIND_FORKED) - { - if (random_signal) /* I.e., no catchpoint triggered for this. */ - { - trap_expected = 1; - stop_signal = TARGET_SIGNAL_0; - goto keep_going; - } - } - else if (w.kind == TARGET_WAITKIND_VFORKED) - { - if (random_signal) /* I.e., no catchpoint triggered for this. */ - { - stop_signal = TARGET_SIGNAL_0; - goto keep_going; - } - } - else if (w.kind == TARGET_WAITKIND_EXECD) - { - pending_follow.kind = w.kind; - if (random_signal) /* I.e., no catchpoint triggered for this. */ - { - trap_expected = 1; - stop_signal = TARGET_SIGNAL_0; - goto keep_going; - } - } - - /* 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 (signal_print[stop_signal]) - { - printed = 1; - target_terminal_ours_for_output (); - 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 (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 = TARGET_SIGNAL_0; - - /* If we're in the middle of a "next" command, let the code for - stepping over a function handle this. pai/1997-09-10 - - A previous comment here suggested it was possible to change - this to jump to keep_going in all cases. */ - - if (step_over_calls > 0) - goto step_over_function; - else - 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 (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; - } - /* 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; - } - -#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 - && (INNER_THAN (FRAME_FP (get_current_frame ()), - 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) - { - thread_step_needed = 1; - 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: - /* This proably demands a more elegant solution, but, yeah - right... - - This function's use of the simple variable - step_resume_breakpoint doesn't seem to accomodate - simultaneously active step-resume bp's, although the - breakpoint list certainly can. - - If we reach here and step_resume_breakpoint is already - NULL, then apparently we have multiple active - step-resume bp's. We'll just delete the breakpoint we - stopped at, and carry on. */ - if (step_resume_breakpoint == NULL) - { - step_resume_breakpoint = - bpstat_find_step_resume_breakpoint (stop_bpstat); - } - 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_CHECK_SHLIBS: - case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: -#ifdef SOLIB_ADD - { - extern int auto_solib_add; - - /* Remove breakpoints, we eventually want to step over the - shlib event breakpoint, and SOLIB_ADD might adjust - breakpoint addresses via breakpoint_re_set. */ - if (breakpoints_inserted) - remove_breakpoints (); - breakpoints_inserted = 0; - - /* Check for any newly added shared libraries if we're - supposed to be adding them automatically. */ - if (auto_solib_add) - { - /* Switch terminal for any messages produced by - breakpoint_re_set. */ - target_terminal_ours_for_output (); - SOLIB_ADD (NULL, 0, NULL); - target_terminal_inferior (); - } - - /* Try to reenable shared library breakpoints, additional - code segments in shared libraries might be mapped in now. */ - re_enable_breakpoints_in_shlibs (); - - /* If requested, stop when the dynamic linker notifies - gdb of events. This allows the user to get control - and place breakpoints in initializer routines for - dynamically loaded objects (among other things). */ - if (stop_on_solib_events) - { - stop_print_frame = 0; - goto stop_stepping; - } - - /* If we stopped due to an explicit catchpoint, then the - (see above) call to SOLIB_ADD pulled in any symbols - from a newly-loaded library, if appropriate. - - We do want the inferior to stop, but not where it is - now, which is in the dynamic linker callback. Rather, - we would like it stop in the user's program, just after - the call that caused this catchpoint to trigger. That - gives the user a more useful vantage from which to - examine their program's state. */ - else if (what.main_action == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) - { - /* ??rehrauer: If I could figure out how to get the - right return PC from here, we could just set a temp - breakpoint and resume. I'm not sure we can without - cracking open the dld's shared libraries and sniffing - their unwind tables and text/data ranges, and that's - not a terribly portable notion. - - Until that time, we must step the inferior out of the - dld callback, and also out of the dld itself (and any - code or stubs in libdld.sl, such as "shl_load" and - friends) until we reach non-dld code. At that point, - we can stop stepping. */ - bpstat_get_triggered_catchpoints (stop_bpstat, - &stepping_through_solib_catchpoints); - stepping_through_solib_after_catch = 1; - - /* Be sure to lift all breakpoints, so the inferior does - actually step past this point... */ - another_trap = 1; - break; - } - else - { - /* We want to step over this breakpoint, then keep going. */ - another_trap = 1; - break; - } - } -#endif - 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 - and should stop for that. So fall through and - test for stepping. But, if not stepping, - do not stop. */ - - /* Are we stepping to get the inferior out of the dynamic - linker's hook (and possibly the dld itself) after catching - a shlib event? */ - if (stepping_through_solib_after_catch) - { -#if defined(SOLIB_ADD) - /* Have we reached our destination? If not, keep going. */ - if (SOLIB_IN_DYNAMIC_LINKER (pid, stop_pc)) - { - another_trap = 1; - goto keep_going; - } -#endif - /* Else, stop and report the catchpoint(s) whose triggering - caused us to begin stepping. */ - stepping_through_solib_after_catch = 0; - bpstat_clear (&stop_bpstat); - stop_bpstat = bpstat_copy (stepping_through_solib_catchpoints); - bpstat_clear (&stepping_through_solib_catchpoints); - stop_print_frame = 1; - goto stop_stepping; - } - -#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 (CALL_DUMMY_HAS_COMPLETED (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; -#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'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. - - Note that step_range_end is the address of the first instruction - beyond the step range, and NOT the address of the last instruction - within it! */ - if (stop_pc >= step_range_start - && stop_pc < step_range_end -#if 0 -/* I haven't a clue what might trigger this clause, and it seems wrong - anyway, so I've disabled it until someone complains. -Stu 10/24/95 */ - - /* 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 ()) - && (INNER_THAN (read_sp (), step_sp) - || FRAME_FP (get_current_frame ()) != step_frame_address)) -#endif -) - { - /* 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. */ - - /* If we are stepping at the source level and entered the runtime - loader dynamic symbol resolution code, we keep on single stepping - until we exit the run time loader code and reach the callee's - address. */ - if (step_over_calls < 0 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) - goto keep_going; - - /* 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) - && INNER_THAN (read_sp (), step_sp)) - { - /* We've just taken a signal; go until we are back to - the point where we took it and one more. */ - - /* Note: The test above succeeds not only when we stepped - into a signal handler, but also when we step past the last - statement of a signal handler and end up in the return stub - of the signal handler trampoline. To distinguish between - these two cases, check that the frame is INNER_THAN the - previous one below. pai/1997-09-11 */ - - - { - CORE_ADDR current_frame = FRAME_FP (get_current_frame()); - - if (INNER_THAN (current_frame, step_frame_address)) - { - /* We have 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; - - INIT_SAL(&sr_sal); - sr_sal.symtab = NULL; - sr_sal.line = 0; - sr_sal.pc = prev_pc; - /* 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 (); - } - else - { - /* We just stepped out of a signal handler and into - its calling trampoline. - - Normally, we'd jump to step_over_function from - here, but for some reason GDB can't unwind the - stack correctly to find the real PC for the point - user code where the signal trampoline will return - -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. - But signal trampolines are pretty small stubs of - code, anyway, so it's OK instead to just - single-step out. Note: assuming such trampolines - don't exhibit recursion on any platform... */ - find_pc_partial_function (stop_pc, &stop_func_name, - &stop_func_start, - &stop_func_end); - /* Readjust stepping range */ - step_range_start = stop_func_start; - step_range_end = stop_func_end; - stepping_through_sigtramp = 1; - } - } - - - /* 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 0 - /* I disabled this test because it was too complicated and slow. - The SKIP_PROLOGUE was especially slow, because it caused - unnecessary prologue examination on various architectures. - The code in the #else clause has been tested on the Sparc, - Mips, PA, and Power architectures, so it's pretty likely to - be correct. -Stu 10/24/95 */ - - /* 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 (!(INNER_THAN (step_sp, read_sp ())) /* don't mistake (sig)return - as a call */ - && (/* 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_CALL_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 test is a much more streamlined, (but hopefully correct) - replacement for the code above. It's been tested on the Sparc, - Mips, PA, and Power architectures with good results. */ - - if (stop_pc == stop_func_start /* Quick test */ - || (in_prologue (stop_pc, stop_func_start) && - ! IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, stop_func_name)) - || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, stop_func_name) - || stop_func_name == 0) -#endif - - { - /* 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 || IGNORE_HELPER_CALL (stop_pc)) - /* 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; - else - { - tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); - if (tmp) - { - struct symtab_and_line xxx; - /* Why isn't this s_a_l called "sr_sal", like all of the - other s_a_l's where this code is duplicated? */ - INIT_SAL (&xxx); /* initialize to zeroes */ - xxx.pc = tmp; - xxx.section = find_pc_overlay (xxx.pc); - step_resume_breakpoint = - set_momentary_breakpoint (xxx, NULL, bp_step_resume); - insert_breakpoints (); - goto keep_going; - } - } - - /* 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; - - INIT_SAL(&sr_sal); - sr_sal.symtab = NULL; - sr_sal.line = 0; - - /* If we came here after encountering a signal in the middle of - a "next", use the stashed-away previous frame pc */ - sr_sal.pc - = stopped_by_random_signal - ? prev_pc - : ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ())); - - step_resume_breakpoint = - set_momentary_breakpoint (sr_sal, - stopped_by_random_signal ? - NULL : get_current_frame (), - bp_step_resume); - - /* We've just entered a callee, and we wish to resume until - it returns to the caller. Setting a step_resume bp on - the return PC will catch a return from the callee. - - However, if the callee is recursing, we want to be - careful not to catch returns of those recursive calls, - but of THIS instance of the call. - - To do this, we set the step_resume bp's frame to our - current caller's frame (step_frame_address, which is - set by the "next" or "until" command, before execution - begins). - - But ... don't do it if we're single-stepping out of a - sigtramp, because the reason we're single-stepping is - precisely because unwinding is a problem (HP-UX 10.20, - e.g.) and the frame address is likely to be incorrect. - No danger of sigtramp recursion. */ - - if (stepping_through_sigtramp) - { - step_resume_breakpoint->frame = (CORE_ADDR) NULL; - stepping_through_sigtramp = 0; - } - else if (!IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) - 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. */ - { - 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 (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. */ -#else - 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. */ - { - struct symtab_and_line sr_sal; - - INIT_SAL (&sr_sal); /* initialize to zeroes */ - sr_sal.pc = stop_func_start; - sr_sal.section = find_pc_overlay (stop_func_start); - /* 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. */ - - 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 we're in the return path from a shared library trampoline, - we want to proceed through the trampoline when stepping. */ - if (IN_SOLIB_RETURN_TRAMPOLINE(stop_pc, stop_func_name)) - { - CORE_ADDR tmp; - - /* Determine where this trampoline returns. */ - tmp = SKIP_TRAMPOLINE_CODE (stop_pc); - - /* Only proceed through if we know where it's going. */ - if (tmp) - { - /* And put the step-breakpoint there and go until there. */ - struct symtab_and_line sr_sal; - - INIT_SAL (&sr_sal); /* initialize to zeroes */ - sr_sal.pc = tmp; - sr_sal.section = find_pc_overlay (sr_sal.pc); - /* 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 (); - - /* Restart without fiddling with the step ranges or - other state. */ - goto keep_going; - } - } - - 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; - step_frame_address = FRAME_FP (get_current_frame ()); - current_line = sal.line; - current_symtab = sal.symtab; - - /* In the case where we just stepped out of a function into the middle - of a line of the caller, continue stepping, but step_frame_address - must be modified to current frame */ - { - CORE_ADDR current_frame = FRAME_FP (get_current_frame()); - if (!(INNER_THAN (current_frame, step_frame_address))) - step_frame_address = current_frame; - } - - - goto keep_going; - - check_sigtramp2: - if (trap_expected - && IN_SIGTRAMP (stop_pc, stop_func_name) - && !IN_SIGTRAMP (prev_pc, prev_func_name) - && INNER_THAN (read_sp (), step_sp)) - { - /* 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; - - INIT_SAL (&sr_sal); /* initialize to zeroes */ - sr_sal.pc = prev_pc; - sr_sal.section = find_pc_overlay (sr_sal.pc); - /* 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_breakpoints (); - - remove_breakpoints_on_following_step = 1; - another_trap = 1; - } - - keep_going: - /* Come to this label when you need to resume the inferior. - It's really much cleaner to do a goto than a maze of if-else - conditions. */ - - /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug - a vforked child beetween its creation and subsequent exit or - call to exec(). However, I had big problems in this rather - creaky exec engine, getting that to work. The fundamental - problem is that I'm trying to debug two processes via an - engine that only understands a single process with possibly - multiple threads. - - Hence, this spot is known to have problems when - target_can_follow_vfork_prior_to_exec returns 1. */ - - /* Save the pc before execution, to compare with pc after stop. */ - prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ - prev_func_start = stop_func_start; /* Ok, since if DECR_PC_AFTER - BREAK is defined, the - original pc would not have - been at the start of a - function. */ - prev_func_name = stop_func_name; - - 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 != 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 (CURRENTLY_STEPPING (), stop_signal); - } - else - { - /* 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. */ - /* 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 - && through_sigtramp_breakpoint == NULL - && remove_breakpoints_on_following_step) - { - remove_breakpoints_on_following_step = 0; - remove_breakpoints (); - breakpoints_inserted = 0; - } - else if (!breakpoints_inserted && - (through_sigtramp_breakpoint != NULL || !another_trap)) - { - breakpoints_failed = insert_breakpoints (); - if (breakpoints_failed) - break; - breakpoints_inserted = 1; - } - - trap_expected = another_trap; - - 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 != TARGET_SIGNAL_CHLD) - && !stopped_by_random_signal) - SHIFT_INST_REGS(); -#endif /* SHIFT_INST_REGS */ - - resume (CURRENTLY_STEPPING (), stop_signal); - } - } - - stop_stepping: - if (target_has_execution) - { - /* Are we stopping for a vfork event? We only stop when we see - the child's event. However, we may not yet have seen the - parent's event. And, inferior_pid is still set to the parent's - pid, until we resume again and follow either the parent or child. - - To ensure that we can really touch inferior_pid (aka, the - parent process) -- which calls to functions like read_pc - implicitly do -- wait on the parent if necessary. */ - if ((pending_follow.kind == TARGET_WAITKIND_VFORKED) - && ! pending_follow.fork_event.saw_parent_fork) - { - int parent_pid; - - do { - if (target_wait_hook) - parent_pid = target_wait_hook (-1, &w); - else - parent_pid = target_wait (-1, &w); - } while (parent_pid != inferior_pid); - } - - - /* 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; - } - do_cleanups (old_cleanups); -} - -/* This function returns TRUE if ep is an internal breakpoint - set to catch generic shared library (aka dynamically-linked - library) events. (This is *NOT* the same as a catchpoint for a - shlib event. The latter is something a user can set; this is - something gdb sets for its own use, and isn't ever shown to a - user.) */ -static int -is_internal_shlib_eventpoint (ep) - struct breakpoint * ep; -{ - return - (ep->type == bp_shlib_event) - ; -} - -/* This function returns TRUE if bs indicates that the inferior - stopped due to a shared library (aka dynamically-linked library) - event. */ -static int -stopped_for_internal_shlib_event (bs) - bpstat bs; -{ - /* Note that multiple eventpoints may've caused the stop. Any - that are associated with shlib events will be accepted. */ - for (;bs != NULL; bs = bs->next) - { - if ((bs->breakpoint_at != NULL) - && is_internal_shlib_eventpoint (bs->breakpoint_at)) - return 1; - } - - /* If we get here, then no candidate was found. */ - return 0; -} - -/* This function returns TRUE if bs indicates that the inferior - stopped due to a shared library (aka dynamically-linked library) - event caught by a catchpoint. - - If TRUE, cp_p is set to point to the catchpoint. - - Else, the value of cp_p is undefined. */ -static int -stopped_for_shlib_catchpoint (bs, cp_p) - bpstat bs; - struct breakpoint ** cp_p; -{ - /* Note that multiple eventpoints may've caused the stop. Any - that are associated with shlib events will be accepted. */ - *cp_p = NULL; - - for (;bs != NULL; bs = bs->next) - { - if ((bs->breakpoint_at != NULL) - && ep_is_shlib_catchpoint (bs->breakpoint_at)) - { - *cp_p = bs->breakpoint_at; - return 1; - } - } - - /* If we get here, then no candidate was found. */ - return 0; -} - - -/* Here to return control to GDB when the inferior stops for real. - Print appropriate messages, remove breakpoints, give terminal our modes. - - 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. */ - -void -normal_stop () -{ - -#ifdef HPUXHPPA - /* As with the notification of thread events, we want to delay - notifying the user that we've switched thread context until - the inferior actually stops. - - (Note that there's no point in saying anything if the inferior - has exited!) */ - if ((switched_from_inferior_pid != inferior_pid) && - target_has_execution) - { - target_terminal_ours_for_output (); - printf_filtered ("[Switched to %s]\n", - target_pid_or_tid_to_str (inferior_pid)); - switched_from_inferior_pid = inferior_pid; - } -#endif - - /* 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()) - (get_current_frame ())->pc = read_pc (); - - if (breakpoints_failed) - { - target_terminal_ours_for_output (); - print_sys_errmsg ("ptrace", breakpoints_failed); - printf_filtered ("Stopped; cannot insert breakpoints.\n\ -The same program may be running in another process.\n"); - } - - if (target_has_execution && breakpoints_inserted) - { - if (remove_breakpoints ()) - { - target_terminal_ours_for_output (); - printf_filtered ("Cannot remove breakpoints because "); - printf_filtered ("program is no longer writable.\n"); - printf_filtered ("It might be running in another process.\n"); - printf_filtered ("Further execution is probably impossible.\n"); - } - } - breakpoints_inserted = 0; - - /* 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_bpstat); - - /* If an auto-display called a function and that got a signal, - delete that auto-display to avoid an infinite recursion. */ - - if (stopped_by_random_signal) - disable_current_display (); - - /* Don't print a message if in the middle of doing a "step n" - operation for n > 1 */ - if (step_multi && stop_step) - goto done; - - target_terminal_ours (); - - /* Did we stop because the user set the stop_on_solib_events - variable? (If so, we report this as a generic, "Stopped due - to shlib event" message.) */ - if (stopped_for_internal_shlib_event (stop_bpstat)) - { - printf_filtered ("Stopped due to shared library event\n"); - } - - /* Look up the hook_stop and run it if it exists. */ - - if (stop_command && stop_command->hook) - { - catch_errors (hook_stop_stub, stop_command->hook, - "Error while running hook_stop:\n", RETURN_MASK_ALL); - } - - if (!target_has_stack) - { - - goto done; - } - - /* Select innermost stack frame - i.e., current frame is frame 0, - and current location is based on that. - Don't do this on return from a stack dummy routine, - or if the program has exited. */ - - if (!stop_stack_dummy) - { - select_frame (get_current_frame (), 0); - - /* Print current location without a level number, if - we have changed functions or hit a breakpoint. - Print source line if we have one. - bpstat_print() contains the logic deciding in detail - what to print, based on the event(s) that just occurred. */ - - if (stop_print_frame) - { - int bpstat_ret; - int source_flag; - - bpstat_ret = bpstat_print (stop_bpstat); - /* bpstat_print() returned one of: - -1: Didn't print anything - 0: Printed preliminary "Breakpoint n, " message, desires - location tacked on - 1: Printed something, don't tack on location */ - - if (bpstat_ret == -1) - if ( stop_step - && step_frame_address == FRAME_FP (get_current_frame ()) - && step_start_function == find_pc_function (stop_pc)) - source_flag = -1; /* finished step, just print source line */ - else - source_flag = 1; /* print location and source line */ - else if (bpstat_ret == 0) /* hit bpt, desire location */ - source_flag = 1; /* print location and source line */ - else /* bpstat_ret == 1, hit bpt, do not desire location */ - source_flag = -1; /* just print source line */ - - /* The behavior of this routine with respect to the source - flag is: - -1: Print only source line - 0: Print only location - 1: Print location and source line */ - show_and_print_stack_frame (selected_frame, -1, source_flag); - - /* Display the auto-display expressions. */ - do_displays (); - } - } - - /* Save the function value return registers, if we care. - We might be about to restore their previous contents. */ - 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_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); - } - - - TUIDO (((TuiOpaqueFuncPtr)tui_vCheckDataValues, selected_frame)); - - done: - annotate_stopped (); -} - -static int -hook_stop_stub (cmd) - PTR cmd; -{ - execute_user_command ((struct cmd_list_element *)cmd, 0); - return (0); -} - -int signal_stop_state (signo) - int signo; -{ - return signal_stop[signo]; -} - -int signal_print_state (signo) - int signo; -{ - return signal_print[signo]; -} - -int signal_pass_state (signo) - int signo; -{ - return signal_program[signo]; -} - -static void -sig_print_header () -{ - printf_filtered ("\ -Signal Stop\tPrint\tPass to program\tDescription\n"); -} - -static void -sig_print_info (oursig) - enum target_signal oursig; -{ - char *name = target_signal_to_name (oursig); - int name_padding = 13 - strlen (name); - if (name_padding <= 0) - name_padding = 0; - - printf_filtered ("%s", name); - printf_filtered ("%*.*s ", name_padding, name_padding, - " "); - 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. */ - -static void -handle_command (args, from_tty) - char *args; - int from_tty; -{ - char **argv; - int digits, wordlen; - int sigfirst, signum, siglast; - enum target_signal oursig; - int allsigs; - int nsigs; - unsigned char *sigs; - struct cleanup *old_chain; - - if (args == NULL) - { - error_no_arg ("signal to handle"); - } - - /* Allocate and zero an array of flags for which signals to handle. */ - - nsigs = (int)TARGET_SIGNAL_LAST; - sigs = (unsigned char *) alloca (nsigs); - memset (sigs, 0, nsigs); - - /* Break the command line up into args. */ - - argv = buildargv (args); - if (argv == NULL) - { - nomem (0); - } - old_chain = make_cleanup ((make_cleanup_func) freeargv, (char *) argv); - - /* 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>. */ - - while (*argv != NULL) - { - wordlen = strlen (*argv); - for (digits = 0; isdigit ((*argv)[digits]); digits++) {;} - allsigs = 0; - sigfirst = siglast = -1; - - if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) - { - /* Apply action to all signals except those used by the - debugger. Silently skip those. */ - allsigs = 1; - sigfirst = 0; - siglast = nsigs - 1; - } - else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) - { - SET_SIGS (nsigs, sigs, signal_stop); - SET_SIGS (nsigs, sigs, signal_print); - } - else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) - { - UNSET_SIGS (nsigs, sigs, signal_program); - } - else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) - { - SET_SIGS (nsigs, sigs, signal_print); - } - else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) - { - SET_SIGS (nsigs, sigs, signal_program); - } - else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) - { - UNSET_SIGS (nsigs, sigs, signal_stop); - } - else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) - { - SET_SIGS (nsigs, sigs, signal_program); - } - else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) - { - UNSET_SIGS (nsigs, sigs, signal_print); - UNSET_SIGS (nsigs, sigs, signal_stop); - } - else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) - { - UNSET_SIGS (nsigs, sigs, signal_program); - } - else if (digits > 0) - { - /* 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 = (int) - target_signal_from_command (atoi (*argv)); - if ((*argv)[digits] == '-') - { - siglast = (int) - target_signal_from_command (atoi ((*argv) + digits + 1)); - } - if (sigfirst > siglast) - { - /* Bet he didn't figure we'd think of this case... */ - signum = sigfirst; - sigfirst = siglast; - siglast = signum; - } - } - else - { - 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 - which signals to apply actions to. */ - - for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) - { - switch ((enum target_signal)signum) - { - case TARGET_SIGNAL_TRAP: - case TARGET_SIGNAL_INT: - if (!allsigs && !sigs[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_unfiltered ("Not confirmed, unchanged.\n"); - gdb_flush (gdb_stdout); - } - } - break; - case TARGET_SIGNAL_0: - case TARGET_SIGNAL_DEFAULT: - case TARGET_SIGNAL_UNKNOWN: - /* Make sure that "all" doesn't print these. */ - break; - default: - sigs[signum] = 1; - break; - } - } - - argv++; - } - - target_notice_signals(inferior_pid); - - if (from_tty) - { - /* Show the results. */ - sig_print_header (); - for (signum = 0; signum < nsigs; signum++) - { - if (sigs[signum]) - { - sig_print_info (signum); - } - } - } - - do_cleanups (old_chain); -} - -static void -xdb_handle_command (args, from_tty) - char *args; - int from_tty; -{ - char **argv; - struct cleanup *old_chain; - - /* Break the command line up into args. */ - - argv = buildargv (args); - if (argv == NULL) - { - nomem (0); - } - old_chain = make_cleanup ((make_cleanup_func) freeargv, (char *) argv); - if (argv[1] != (char *)NULL) - { - char *argBuf; - int bufLen; - - bufLen = strlen(argv[0]) + 20; - argBuf = (char *)xmalloc(bufLen); - if (argBuf) - { - int validFlag = 1; - enum target_signal oursig; - - oursig = target_signal_from_name (argv[0]); - memset(argBuf, 0, bufLen); - if (strcmp(argv[1], "Q") == 0) - sprintf(argBuf, "%s %s", argv[0], "noprint"); - else - { - if (strcmp(argv[1], "s") == 0) - { - if (!signal_stop[oursig]) - sprintf(argBuf, "%s %s", argv[0], "stop"); - else - sprintf(argBuf, "%s %s", argv[0], "nostop"); - } - else if (strcmp(argv[1], "i") == 0) - { - if (!signal_program[oursig]) - sprintf(argBuf, "%s %s", argv[0], "pass"); - else - sprintf(argBuf, "%s %s", argv[0], "nopass"); - } - else if (strcmp(argv[1], "r") == 0) - { - if (!signal_print[oursig]) - sprintf(argBuf, "%s %s", argv[0], "print"); - else - sprintf(argBuf, "%s %s", argv[0], "noprint"); - } - else - validFlag = 0; - } - if (validFlag) - handle_command(argBuf, from_tty); - else - printf_filtered("Invalid signal handling flag.\n"); - if (argBuf) - free(argBuf); - } - } - do_cleanups (old_chain); -} - -/* 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; -{ - enum target_signal oursig; - sig_print_header (); - - if (signum_exp) - { - /* First see if this is a symbol name. */ - oursig = target_signal_from_name (signum_exp); - if (oursig == TARGET_SIGNAL_UNKNOWN) - { - /* No, try numeric. */ - oursig = - target_signal_from_command (parse_and_eval_address (signum_exp)); - } - sig_print_info (oursig); - return; - } - - printf_filtered ("\n"); - /* 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; - - 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"); -} - -/* 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_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 { - CORE_ADDR frame_address; - int level; -}; - -static int restore_selected_frame PARAMS ((PTR)); - -/* 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) - PTR args; -{ - struct restore_selected_frame_args *fr = - (struct restore_selected_frame_args *) args; - struct frame_info *frame; - int level = fr->level; - - frame = find_relative_frame (get_current_frame (), &level); - - /* If inf_status->selected_frame_address is NULL, there was no - previously selected frame. */ - if (frame == NULL || - /* FRAME_FP (frame) != fr->frame_address || */ - /* elz: deleted this check as a quick fix to the problem that - for function called by hand gdb creates no internal frame - structure and the real stack and gdb's idea of stack are - different if nested calls by hands are made. - - mvs: this worries me. */ - level != 0) - { - warning ("Unable to restore previously selected frame.\n"); - return 0; - } - - select_frame (frame, 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_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); - - } -} - - - -void -set_follow_fork_mode_command (arg, from_tty, c) - char * arg; - int from_tty; - struct cmd_list_element * c; -{ - if (! STREQ (arg, "parent") && - ! STREQ (arg, "child") && - ! STREQ (arg, "both") && - ! STREQ (arg, "ask")) - error ("follow-fork-mode must be one of \"parent\", \"child\", \"both\" or \"ask\"."); - - if (follow_fork_mode_string != NULL) - free (follow_fork_mode_string); - follow_fork_mode_string = savestring (arg, strlen (arg)); -} - - - -void -_initialize_infrun () -{ - register int i; - register int numsigs; - struct cmd_list_element * c; - - add_info ("signals", signals_info, - "What debugger does when program gets various signals.\n\ -Specify a signal as argument to print info on that signal only."); - add_info_alias ("handle", "signals", 0); - - add_com ("handle", class_run, handle_command, - concat ("Specify how to handle a signal.\n\ -Args are signals and actions to apply to those signals.\n\ -Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ -from 1-15 are allowed for compatibility with old versions of GDB.\n\ -Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\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.", NULL)); - if (xdb_commands) - { - add_com("lz", class_info, signals_info, - "What debugger does when program gets various signals.\n\ -Specify a signal as argument to print info on that signal only."); - add_com("z", class_run, xdb_handle_command, - concat ("Specify how to handle a signal.\n\ -Args are signals and actions to apply to those signals.\n\ -Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ -from 1-15 are allowed for compatibility with old versions of GDB.\n\ -Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\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 \"s\" (toggles between stop and nostop), \n\ -\"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ -nopass), \"Q\" (noprint)\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.", NULL)); - } - - if (!dbx_commands) - 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); - for (i = 0; i < numsigs; i++) - { - signal_stop[i] = 1; - signal_print[i] = 1; - signal_program[i] = 1; - } - - /* Signals caused by debugger's own actions - should not be given to the program afterwards. */ - signal_program[TARGET_SIGNAL_TRAP] = 0; - signal_program[TARGET_SIGNAL_INT] = 0; - - /* Signals that are not errors should not normally enter the debugger. */ - 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; - signal_stop[TARGET_SIGNAL_WINCH] = 0; - signal_print[TARGET_SIGNAL_WINCH] = 0; - -#ifdef SOLIB_ADD - add_show_from_set - (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, - (char *) &stop_on_solib_events, - "Set stopping for shared library events.\n\ -If nonzero, gdb will give control to the user when the dynamic linker\n\ -notifies gdb of shared library events. The most common event of interest\n\ -to the user would be loading/unloading of a new library.\n", - &setlist), - &showlist); -#endif - - c = add_set_enum_cmd ("follow-fork-mode", - class_run, - follow_fork_mode_kind_names, - (char *) &follow_fork_mode_string, -/* ??rehrauer: The "both" option is broken, by what may be a 10.20 - kernel problem. It's also not terribly useful without a GUI to - help the user drive two debuggers. So for now, I'm disabling - the "both" option. */ -/* "Set debugger response to a program call of fork \ -or vfork.\n\ -A fork or vfork creates a new process. follow-fork-mode can be:\n\ - parent - the original process is debugged after a fork\n\ - child - the new process is debugged after a fork\n\ - both - both the parent and child are debugged after a fork\n\ - ask - the debugger will ask for one of the above choices\n\ -For \"both\", another copy of the debugger will be started to follow\n\ -the new child process. The original debugger will continue to follow\n\ -the original parent process. To distinguish their prompts, the\n\ -debugger copy's prompt will be changed.\n\ -For \"parent\" or \"child\", the unfollowed process will run free.\n\ -By default, the debugger will follow the parent process.", -*/ - "Set debugger response to a program call of fork \ -or vfork.\n\ -A fork or vfork creates a new process. follow-fork-mode can be:\n\ - parent - the original process is debugged after a fork\n\ - child - the new process is debugged after a fork\n\ - ask - the debugger will ask for one of the above choices\n\ -For \"parent\" or \"child\", the unfollowed process will run free.\n\ -By default, the debugger will follow the parent process.", - &setlist); -/* c->function.sfunc = ;*/ - add_show_from_set (c, &showlist); - - set_follow_fork_mode_command ("parent", 0, NULL); - - c = add_set_enum_cmd ("scheduler-locking", class_run, - scheduler_enums, /* array of string names */ - (char *) &scheduler_mode, /* current mode */ - "Set mode for locking scheduler during execution.\n\ -off == no locking (threads may preempt at any time)\n\ -on == full locking (no thread except the current thread may run)\n\ -step == scheduler locked during every single-step operation.\n\ - In this mode, no other thread may run during a step command.\n\ - Other threads may run while stepping over a function call ('next').", - &setlist); - - c->function.sfunc = set_schedlock_func; /* traps on target vector */ - add_show_from_set (c, &showlist); -} |