X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Finftarg.c;h=a20c39fd07ad36960583258fdd37da2a4648cf4e;hb=464e0365d26d6de5eaa70d14c69a3028ed222deb;hp=ce64437f766a77fca0411d9995c51fa9206bf950;hpb=3c0c9328b9c299580bcf8cb6fdb3b71d5a0525ff;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/inftarg.c b/gdb/inftarg.c index ce64437f76..a20c39fd07 100644 --- a/gdb/inftarg.c +++ b/gdb/inftarg.c @@ -1,108 +1,285 @@ -/* Subroutines for handling an "inferior" (child) process as a target - for debugging, in GDB. - Copyright 1990, 1991 Free Software Foundation, Inc. +/* Target-vector operations for controlling Unix child processes, for GDB. + + Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, + 2000, 2002, 2003 Free Software Foundation, Inc. + Contributed by Cygnus Support. -This file is part of GDB. + ## Contains temporary hacks.. -GDB 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 1, or (at your option) -any later version. + This file is part of GDB. -GDB 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. + 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. -You should have received a copy of the GNU General Public License -along with GDB; see the file COPYING. If not, write to -the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + 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 #include "defs.h" -#include "param.h" -#include "frame.h" /* required by inferior.h */ +#include "frame.h" /* required by inferior.h */ #include "inferior.h" #include "target.h" -#include "wait.h" #include "gdbcore.h" -#include "ieee-float.h" /* Required by REGISTER_CONVERT_TO_XXX */ - -extern int fetch_inferior_registers(); -extern int store_inferior_registers(); -extern int child_xfer_memory(); -extern int memory_insert_breakpoint(), memory_remove_breakpoint(); -extern void terminal_init_inferior(), terminal_ours(), terminal_inferior(); -extern void terminal_ours_for_output(), child_terminal_info(); -extern void kill_inferior(), add_syms_addr_command(); -extern struct value *call_function_by_hand(); -extern void child_resume(); -extern void child_create_inferior(); -extern void child_mourn_inferior(); -extern void child_attach (); - -/* Forward declaration */ -extern struct target_ops child_ops; +#include "command.h" +#include "gdb_stat.h" +#include +#include +#include + +#include "gdb_wait.h" +#include "inflow.h" + +extern struct symtab_and_line *child_enable_exception_callback (enum + exception_event_kind, + int); + +extern struct exception_event_record + *child_get_current_exception_event (void); + +extern void _initialize_inftarg (void); + +static void child_prepare_to_store (void); + +#ifndef CHILD_WAIT +static ptid_t child_wait (ptid_t, struct target_waitstatus *); +#endif /* CHILD_WAIT */ + +#if !defined(CHILD_POST_WAIT) +void child_post_wait (ptid_t, int); +#endif + +static void child_open (char *, int); + +static void child_files_info (struct target_ops *); + +static void child_detach (char *, int); + +static void child_attach (char *, int); + +#if !defined(CHILD_POST_ATTACH) +extern void child_post_attach (int); +#endif + +static void ptrace_me (void); + +static void ptrace_him (int); + +static void child_create_inferior (char *, char *, char **); + +static void child_mourn_inferior (void); + +static int child_can_run (void); + +static void child_stop (void); + +#ifndef CHILD_THREAD_ALIVE +int child_thread_alive (ptid_t); +#endif + +static void init_child_ops (void); + +extern char **environ; + +struct target_ops child_ops; + +int child_suppress_run = 0; /* Non-zero if inftarg should pretend not to + be a runnable target. Used by targets + that can sit atop inftarg, such as HPUX + thread support. */ + +#ifndef CHILD_WAIT /* Wait for child to do something. Return pid of child, or -1 in case - of error; store status through argument pointer STATUS. */ + of error; store status through argument pointer OURSTATUS. */ -int -child_wait (status) - int *status; +static ptid_t +child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) { + int save_errno; + int status; + char *execd_pathname = NULL; + int exit_status; + int related_pid; + int syscall_id; + enum target_waitkind kind; int pid; - do { - pid = wait (status); - if (pid == -1) /* No more children to wait for */ + do + { + set_sigint_trap (); /* Causes SIGINT to be passed on to the + attached process. */ + set_sigio_trap (); + + pid = ptrace_wait (inferior_ptid, &status); + + save_errno = errno; + + clear_sigio_trap (); + + clear_sigint_trap (); + + if (pid == -1) + { + if (save_errno == EINTR) + continue; + + fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n", + safe_strerror (save_errno)); + + /* Claim it exited with unknown signal. */ + ourstatus->kind = TARGET_WAITKIND_SIGNALLED; + ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; + return pid_to_ptid (-1); + } + + /* Did it exit? + */ + if (target_has_exited (pid, status, &exit_status)) + { + /* ??rehrauer: For now, ignore this. */ + continue; + } + + if (!target_thread_alive (pid_to_ptid (pid))) + { + ourstatus->kind = TARGET_WAITKIND_SPURIOUS; + return pid_to_ptid (pid); + } + } while (pid != PIDGET (inferior_ptid)); /* Some other child died or stopped */ + + store_waitstatus (ourstatus, status); + return pid_to_ptid (pid); +} +#endif /* CHILD_WAIT */ + +#if !defined(CHILD_POST_WAIT) +void +child_post_wait (ptid_t ptid, int wait_status) +{ + /* This version of Unix doesn't require a meaningful "post wait" + operation. + */ +} +#endif + + +#ifndef CHILD_THREAD_ALIVE + +/* Check to see if the given thread is alive. + + FIXME: Is kill() ever the right way to do this? I doubt it, but + for now we're going to try and be compatable with the old thread + code. */ +int +child_thread_alive (ptid_t ptid) +{ + pid_t pid = PIDGET (ptid); + + return (kill (pid, 0) != -1); +} + +#endif + +/* Attach to process PID, then initialize for debugging it. */ + +static void +child_attach (char *args, int from_tty) +{ + if (!args) + error_no_arg ("process-id to attach"); + +#ifndef ATTACH_DETACH + error ("Can't attach to a process on this machine."); +#else + { + char *exec_file; + int pid; + char *dummy; + + dummy = args; + pid = strtol (args, &dummy, 0); + /* Some targets don't set errno on errors, grrr! */ + if ((pid == 0) && (args == dummy)) + error ("Illegal process-id: %s\n", args); + + if (pid == getpid ()) /* Trying to masturbate? */ + error ("I refuse to debug myself!"); + + if (from_tty) { - fprintf (stderr, "Child process unexpectedly missing.\n"); - *status = 42; /* Claim it exited with signal 42 */ - return -1; + exec_file = (char *) get_exec_file (0); + + if (exec_file) + printf_unfiltered ("Attaching to program: %s, %s\n", exec_file, + target_pid_to_str (pid_to_ptid (pid))); + else + printf_unfiltered ("Attaching to %s\n", + target_pid_to_str (pid_to_ptid (pid))); + + gdb_flush (gdb_stdout); } - } while (pid != inferior_pid); /* Some other child died or stopped */ - return pid; + + attach (pid); + + inferior_ptid = pid_to_ptid (pid); + push_target (&child_ops); + } +#endif /* ATTACH_DETACH */ } +#if !defined(CHILD_POST_ATTACH) +void +child_post_attach (int pid) +{ + /* This version of Unix doesn't require a meaningful "post attach" + operation by a debugger. */ +} +#endif -/* - * child_detach() - * takes a program previously attached to and detaches it. - * The program resumes execution and will no longer stop - * on signals, etc. We better not have left any breakpoints - * in the program or it'll die when it hits one. For this - * to work, it may be necessary for the process to have been - * previously attached. It *might* work if the program was - * started via the normal ptrace (PTRACE_TRACEME). - */ +/* Take a program previously attached to and detaches it. + The program resumes execution and will no longer stop + on signals, etc. We'd better not have left any breakpoints + in the program or it'll die when it hits one. For this + to work, it may be necessary for the process to have been + previously attached. It *might* work if the program was + started via the normal ptrace (PTRACE_TRACEME). */ static void -child_detach (args, from_tty) - char *args; - int from_tty; +child_detach (char *args, int from_tty) { - int siggnal = 0; - #ifdef ATTACH_DETACH - if (from_tty) - { - char *exec_file = get_exec_file (0); - if (exec_file == 0) - exec_file = ""; - printf ("Detaching program: %s pid %d\n", - exec_file, inferior_pid); - fflush (stdout); - } - if (args) - siggnal = atoi (args); - - detach (siggnal); - inferior_pid = 0; - unpush_target (&child_ops); /* Pop out of handling an inferior */ + { + int siggnal = 0; + int pid = PIDGET (inferior_ptid); + + if (from_tty) + { + char *exec_file = get_exec_file (0); + if (exec_file == 0) + exec_file = ""; + printf_unfiltered ("Detaching from program: %s, %s\n", exec_file, + target_pid_to_str (pid_to_ptid (pid))); + gdb_flush (gdb_stdout); + } + if (args) + siggnal = atoi (args); + + detach (siggnal); + + inferior_ptid = null_ptid; + unpush_target (&child_ops); + } #else - error ("This version of Unix does not support detaching a process."); + error ("This version of Unix does not support detaching a process."); #endif } @@ -112,71 +289,410 @@ child_detach (args, from_tty) that registers contains all the registers from the program being debugged. */ -void -child_prepare_to_store () +static void +child_prepare_to_store (void) { #ifdef CHILD_PREPARE_TO_STORE CHILD_PREPARE_TO_STORE (); #endif } -/* Convert data from raw format for register REGNUM - to virtual format for register REGNUM. */ +/* Print status information about what we're accessing. */ -void -host_convert_to_virtual (regnum, from, to) - int regnum; - char *from; - char *to; +static void +child_files_info (struct target_ops *ignore) +{ + printf_unfiltered ("\tUsing the running image of %s %s.\n", + attach_flag ? "attached" : "child", target_pid_to_str (inferior_ptid)); +} + +static void +child_open (char *arg, int from_tty) +{ + error ("Use the \"run\" command to start a Unix child process."); +} + +/* Stub function which causes the inferior that runs it, to be ptrace-able + by its parent process. */ + +static void +ptrace_me (void) +{ + /* "Trace me, Dr. Memory!" */ + call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0); +} + +/* Stub function which causes the GDB that runs it, to start ptrace-ing + the child process. */ + +static void +ptrace_him (int pid) { - REGISTER_CONVERT_TO_VIRTUAL (regnum, from, to); + push_target (&child_ops); + + /* On some targets, there must be some explicit synchronization + between the parent and child processes after the debugger + forks, and before the child execs the debuggee program. This + call basically gives permission for the child to exec. + */ + + target_acknowledge_created_inferior (pid); + + /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, + * and will be 1 or 2 depending on whether we're starting + * without or with a shell. + */ + startup_inferior (START_INFERIOR_TRAPS_EXPECTED); + + /* On some targets, there must be some explicit actions taken after + the inferior has been started up. + */ + target_post_startup_inferior (pid_to_ptid (pid)); } -/* Convert data from virtual format for register REGNUM - to raw format for register REGNUM. */ +/* Start an inferior Unix child process and sets inferior_ptid to its pid. + EXEC_FILE is the file to run. + ALLARGS is a string containing the arguments to the program. + ENV is the environment vector to pass. Errors reported with error(). */ + +static void +child_create_inferior (char *exec_file, char *allargs, char **env) +{ +#ifdef HPUXHPPA + fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, pre_fork_inferior, NULL); +#else + fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL, NULL); +#endif + /* We are at the first instruction we care about. */ + /* Pedal to the metal... */ + proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); +} +#if !defined(CHILD_POST_STARTUP_INFERIOR) void -host_convert_from_virtual (regnum, from, to) - int regnum; - char *from; - char *to; +child_post_startup_inferior (ptid_t ptid) { - REGISTER_CONVERT_TO_RAW (regnum, from, to); + /* This version of Unix doesn't require a meaningful "post startup inferior" + operation by a debugger. + */ } +#endif + +#if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR) +void +child_acknowledge_created_inferior (int pid) +{ + /* This version of Unix doesn't require a meaningful "acknowledge created inferior" + operation by a debugger. + */ +} +#endif + + +#if !defined(CHILD_INSERT_FORK_CATCHPOINT) +int +child_insert_fork_catchpoint (int pid) +{ + /* This version of Unix doesn't support notification of fork events. */ + return 0; +} +#endif + +#if !defined(CHILD_REMOVE_FORK_CATCHPOINT) +int +child_remove_fork_catchpoint (int pid) +{ + /* This version of Unix doesn't support notification of fork events. */ + return 0; +} +#endif + +#if !defined(CHILD_INSERT_VFORK_CATCHPOINT) +int +child_insert_vfork_catchpoint (int pid) +{ + /* This version of Unix doesn't support notification of vfork events. */ + return 0; +} +#endif + +#if !defined(CHILD_REMOVE_VFORK_CATCHPOINT) +int +child_remove_vfork_catchpoint (int pid) +{ + /* This version of Unix doesn't support notification of vfork events. */ + return 0; +} +#endif + +#if !defined(CHILD_FOLLOW_FORK) +int +child_follow_fork (int follow_child) +{ + /* This version of Unix doesn't support following fork or vfork events. */ + return 0; +} +#endif + +#if !defined(CHILD_INSERT_EXEC_CATCHPOINT) +int +child_insert_exec_catchpoint (int pid) +{ + /* This version of Unix doesn't support notification of exec events. */ + return 0; +} +#endif + +#if !defined(CHILD_REMOVE_EXEC_CATCHPOINT) +int +child_remove_exec_catchpoint (int pid) +{ + /* This version of Unix doesn't support notification of exec events. */ + return 0; +} +#endif + +#if !defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL) +int +child_reported_exec_events_per_exec_call (void) +{ + /* This version of Unix doesn't support notification of exec events. + */ + return 1; +} +#endif + +#if !defined(CHILD_HAS_EXITED) +int +child_has_exited (int pid, int wait_status, int *exit_status) +{ + if (WIFEXITED (wait_status)) + { + *exit_status = WEXITSTATUS (wait_status); + return 1; + } + + if (WIFSIGNALED (wait_status)) + { + *exit_status = 0; /* ?? Don't know what else to say here. */ + return 1; + } + + /* ?? Do we really need to consult the event state, too? Assume the + wait_state alone suffices. + */ + return 0; +} +#endif -/* Print status information about what we're accessing. */ static void -child_files_info () -{ - printf ("\tUsing the running image of %s process %d.\n", - attach_flag? "attached": "child", inferior_pid); -} - -struct target_ops child_ops = { - "child", "Unix child process", - 0, 0, /* open, close */ - child_attach, child_detach, - child_resume, - child_wait, - fetch_inferior_registers, store_inferior_registers, - child_prepare_to_store, - host_convert_to_virtual, host_convert_from_virtual, - child_xfer_memory, child_files_info, - memory_insert_breakpoint, memory_remove_breakpoint, - terminal_init_inferior, terminal_inferior, - terminal_ours_for_output, terminal_ours, child_terminal_info, - kill_inferior, 0, add_syms_addr_command, /* load */ - call_function_by_hand, - 0, /* lookup_symbol */ - child_create_inferior, child_mourn_inferior, - process_stratum, 0, /* next */ - 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */ - OPS_MAGIC, /* Always the last thing */ -}; +child_mourn_inferior (void) +{ + unpush_target (&child_ops); + generic_mourn_inferior (); +} + +static int +child_can_run (void) +{ + /* This variable is controlled by modules that sit atop inftarg that may layer + their own process structure atop that provided here. hpux-thread.c does + this because of the Hpux user-mode level thread model. */ + + return !child_suppress_run; +} + +/* Send a SIGINT to the process group. This acts just like the user typed a + ^C on the controlling terminal. + + XXX - This may not be correct for all systems. Some may want to use + killpg() instead of kill (-pgrp). */ + +static void +child_stop (void) +{ + kill (-inferior_process_group, SIGINT); +} + +#if !defined(CHILD_ENABLE_EXCEPTION_CALLBACK) +struct symtab_and_line * +child_enable_exception_callback (enum exception_event_kind kind, int enable) +{ + return (struct symtab_and_line *) NULL; +} +#endif + +#if !defined(CHILD_GET_CURRENT_EXCEPTION_EVENT) +struct exception_event_record * +child_get_current_exception_event (void) +{ + return (struct exception_event_record *) NULL; +} +#endif + + +#if !defined(CHILD_PID_TO_EXEC_FILE) +char * +child_pid_to_exec_file (int pid) +{ + /* This version of Unix doesn't support translation of a process ID + to the filename of the executable file. + */ + return NULL; +} +#endif + +char * +child_core_file_to_sym_file (char *core) +{ + /* The target stratum for a running executable need not support + this operation. + */ + return NULL; +} + +/* Perform a partial transfer to/from the specified object. For + memory transfers, fall back to the old memory xfer functions. */ + +static LONGEST +child_xfer_partial (struct target_ops *ops, enum target_object object, + const char *annex, void *readbuf, + const void *writebuf, ULONGEST offset, LONGEST len) +{ + switch (object) + { + case TARGET_OBJECT_MEMORY: + if (readbuf) + return child_xfer_memory (offset, readbuf, len, 0/*write*/, + NULL, ops); + if (writebuf) + return child_xfer_memory (offset, readbuf, len, 1/*write*/, + NULL, ops); + return -1; + + case TARGET_OBJECT_UNWIND_TABLE: +#ifndef NATIVE_XFER_UNWIND_TABLE +#define NATIVE_XFER_UNWIND_TABLE(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1) +#endif + return NATIVE_XFER_UNWIND_TABLE (ops, object, annex, readbuf, writebuf, + offset, len); + +#if 0 + case TARGET_OBJECT_AUXV: + return native_xfer_auxv (PIDGET (inferior_ptid), readbuf, writebuf, + offset, len); +#endif + + default: + return -1; + } +} + +#if !defined(CHILD_PID_TO_STR) +char * +child_pid_to_str (ptid_t ptid) +{ + return normal_pid_to_str (ptid); +} +#endif + +static void +init_child_ops (void) +{ + child_ops.to_shortname = "child"; + child_ops.to_longname = "Unix child process"; + child_ops.to_doc = "Unix child process (started by the \"run\" command)."; + child_ops.to_open = child_open; + child_ops.to_attach = child_attach; + child_ops.to_post_attach = child_post_attach; + child_ops.to_detach = child_detach; + child_ops.to_resume = child_resume; + child_ops.to_wait = child_wait; + child_ops.to_post_wait = child_post_wait; + child_ops.to_fetch_registers = fetch_inferior_registers; + child_ops.to_store_registers = store_inferior_registers; + child_ops.to_prepare_to_store = child_prepare_to_store; + child_ops.to_xfer_memory = child_xfer_memory; + child_ops.to_xfer_partial = child_xfer_partial; + child_ops.to_files_info = child_files_info; + child_ops.to_insert_breakpoint = memory_insert_breakpoint; + child_ops.to_remove_breakpoint = memory_remove_breakpoint; + child_ops.to_terminal_init = terminal_init_inferior; + child_ops.to_terminal_inferior = terminal_inferior; + child_ops.to_terminal_ours_for_output = terminal_ours_for_output; + child_ops.to_terminal_save_ours = terminal_save_ours; + child_ops.to_terminal_ours = terminal_ours; + child_ops.to_terminal_info = child_terminal_info; + child_ops.to_kill = kill_inferior; + child_ops.to_create_inferior = child_create_inferior; + child_ops.to_post_startup_inferior = child_post_startup_inferior; + child_ops.to_acknowledge_created_inferior = child_acknowledge_created_inferior; + child_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint; + child_ops.to_remove_fork_catchpoint = child_remove_fork_catchpoint; + child_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint; + child_ops.to_remove_vfork_catchpoint = child_remove_vfork_catchpoint; + child_ops.to_follow_fork = child_follow_fork; + child_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint; + child_ops.to_remove_exec_catchpoint = child_remove_exec_catchpoint; + child_ops.to_reported_exec_events_per_exec_call = child_reported_exec_events_per_exec_call; + child_ops.to_has_exited = child_has_exited; + child_ops.to_mourn_inferior = child_mourn_inferior; + child_ops.to_can_run = child_can_run; + child_ops.to_thread_alive = child_thread_alive; + child_ops.to_pid_to_str = child_pid_to_str; + child_ops.to_stop = child_stop; + child_ops.to_enable_exception_callback = child_enable_exception_callback; + child_ops.to_get_current_exception_event = child_get_current_exception_event; + child_ops.to_pid_to_exec_file = child_pid_to_exec_file; + child_ops.to_stratum = process_stratum; + child_ops.to_has_all_memory = 1; + child_ops.to_has_memory = 1; + child_ops.to_has_stack = 1; + child_ops.to_has_registers = 1; + child_ops.to_has_execution = 1; + child_ops.to_magic = OPS_MAGIC; +} + +/* Take over the 'find_mapped_memory' vector from inftarg.c. */ +extern void +inftarg_set_find_memory_regions (int (*func) (int (*) (CORE_ADDR, + unsigned long, + int, int, int, + void *), + void *)) +{ + child_ops.to_find_memory_regions = func; +} + +/* Take over the 'make_corefile_notes' vector from inftarg.c. */ +extern void +inftarg_set_make_corefile_notes (char * (*func) (bfd *, int *)) +{ + child_ops.to_make_corefile_notes = func; +} void -_initialize_inftarg () +_initialize_inftarg (void) { +#ifdef HAVE_OPTIONAL_PROC_FS + char procname[32]; + int fd; + + /* If we have an optional /proc filesystem (e.g. under OSF/1), + don't add ptrace support if we can access the running GDB via /proc. */ +#ifndef PROC_NAME_FMT +#define PROC_NAME_FMT "/proc/%05d" +#endif + sprintf (procname, PROC_NAME_FMT, getpid ()); + fd = open (procname, O_RDONLY); + if (fd >= 0) + { + close (fd); + return; + } +#endif + + init_child_ops (); add_target (&child_ops); }