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Diffstat (limited to 'gdb/inftarg.c')
| -rw-r--r-- | gdb/inftarg.c | 856 |
1 files changed, 856 insertions, 0 deletions
diff --git a/gdb/inftarg.c b/gdb/inftarg.c new file mode 100644 index 00000000000..9035310c494 --- /dev/null +++ b/gdb/inftarg.c @@ -0,0 +1,856 @@ +/* Target-vector operations for controlling Unix child processes, for GDB. + Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, + 2000, 2002 + Free Software Foundation, Inc. + Contributed by Cygnus Support. + + ## Contains temporary hacks.. + + 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 "frame.h" /* required by inferior.h */ +#include "inferior.h" +#include "target.h" +#include "gdbcore.h" +#include "command.h" +#include "gdb_stat.h" +#include <signal.h> +#include <sys/types.h> +#include <fcntl.h> + +#include "gdb_wait.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_detach_from_process (int, char *, int, int); + +static void child_attach (char *, int); + +static void child_attach_to_process (char *, int, int); + +#if !defined(CHILD_POST_ATTACH) +extern void child_post_attach (int); +#endif + +static void child_require_attach (char *, int); + +static void child_require_detach (int, char *, int); + +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 + +/*## */ +/* Enable HACK for ttrace work. In + * infttrace.c/require_notification_of_events, + * this is set to 0 so that the loop in child_wait + * won't loop. + */ +int not_same_real_pid = 1; +/*## */ + + +/* Wait for child to do something. Return pid of child, or -1 in case + of error; store status through argument pointer OURSTATUS. */ + +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 + { + 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); + } + + if (target_has_forked (pid, &related_pid) + && ((pid == PIDGET (inferior_ptid)) + || (related_pid == PIDGET (inferior_ptid)))) + { + ourstatus->kind = TARGET_WAITKIND_FORKED; + ourstatus->value.related_pid = related_pid; + return pid_to_ptid (pid); + } + + if (target_has_vforked (pid, &related_pid) + && ((pid == PIDGET (inferior_ptid)) + || (related_pid == PIDGET (inferior_ptid)))) + { + ourstatus->kind = TARGET_WAITKIND_VFORKED; + ourstatus->value.related_pid = related_pid; + return pid_to_ptid (pid); + } + + if (target_has_execd (pid, &execd_pathname)) + { + /* Are we ignoring initial exec events? (This is likely because + we're in the process of starting up the inferior, and another + (older) mechanism handles those.) If so, we'll report this + as a regular stop, not an exec. + */ + if (inferior_ignoring_startup_exec_events) + { + inferior_ignoring_startup_exec_events--; + } + else + { + ourstatus->kind = TARGET_WAITKIND_EXECD; + ourstatus->value.execd_pathname = execd_pathname; + return pid_to_ptid (pid); + } + } + + /* All we must do with these is communicate their occurrence + to wait_for_inferior... + */ + if (target_has_syscall_event (pid, &kind, &syscall_id)) + { + ourstatus->kind = kind; + ourstatus->value.syscall_id = syscall_id; + return pid_to_ptid (pid); + } + + /*## } while (pid != PIDGET (inferior_ptid)); ## *//* Some other child died or stopped */ +/* hack for thread testing */ + } + while ((pid != PIDGET (inferior_ptid)) && not_same_real_pid); +/*## */ + + 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 + +static void +child_attach_to_process (char *args, int from_tty, int after_fork) +{ + 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) + { + exec_file = (char *) get_exec_file (0); + + if (after_fork) + printf_unfiltered ("Attaching after fork to %s\n", + target_pid_to_str (pid_to_ptid (pid))); + else 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); + } + + if (!after_fork) + attach (pid); + else + REQUIRE_ATTACH (pid); + + inferior_ptid = pid_to_ptid (pid); + push_target (&child_ops); + } +#endif /* ATTACH_DETACH */ +} + + +/* Attach to process PID, then initialize for debugging it. */ + +static void +child_attach (char *args, int from_tty) +{ + child_attach_to_process (args, from_tty, 0); +} + +#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 + +static void +child_require_attach (char *args, int from_tty) +{ + child_attach_to_process (args, from_tty, 1); +} + +static void +child_detach_from_process (int pid, char *args, int from_tty, int after_fork) +{ +#ifdef ATTACH_DETACH + { + int siggnal = 0; + + if (from_tty) + { + char *exec_file = get_exec_file (0); + if (exec_file == 0) + exec_file = ""; + if (after_fork) + printf_unfiltered ("Detaching after fork from %s\n", + target_pid_to_str (pid_to_ptid (pid))); + else + 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); + + if (!after_fork) + detach (siggnal); + else + REQUIRE_DETACH (pid, siggnal); + } +#else + error ("This version of Unix does not support detaching a process."); +#endif +} + +/* 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 (char *args, int from_tty) +{ + child_detach_from_process (PIDGET (inferior_ptid), args, from_tty, 0); + inferior_ptid = null_ptid; + unpush_target (&child_ops); +} + +static void +child_require_detach (int pid, char *args, int from_tty) +{ + child_detach_from_process (pid, args, from_tty, 1); +} + + +/* Get ready to modify the registers array. On machines which store + individual registers, this doesn't need to do anything. On machines + which store all the registers in one fell swoop, this makes sure + that registers contains all the registers from the program being + debugged. */ + +static void +child_prepare_to_store (void) +{ +#ifdef CHILD_PREPARE_TO_STORE + CHILD_PREPARE_TO_STORE (); +#endif +} + +/* Print status information about what we're accessing. */ + +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)); +} + +/* ARGSUSED */ +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) +{ + 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)); +} + +/* 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 +child_post_startup_inferior (ptid_t ptid) +{ + /* 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 + + +void +child_clone_and_follow_inferior (int child_pid, int *followed_child) +{ + clone_and_follow_inferior (child_pid, followed_child); + + /* Don't resume CHILD_PID; it's stopped where it ought to be, until + the decision gets made elsewhere how to continue it. + */ +} + + +#if !defined(CHILD_POST_FOLLOW_INFERIOR_BY_CLONE) +void +child_post_follow_inferior_by_clone (void) +{ + /* This version of Unix doesn't require a meaningful "post follow inferior" + operation by a clone 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_HAS_FORKED) +int +child_has_forked (int pid, int *child_pid) +{ + /* This version of Unix doesn't support notification of fork events. */ + return 0; +} +#endif + + +#if !defined(CHILD_HAS_VFORKED) +int +child_has_vforked (int pid, int *child_pid) +{ + /* This version of Unix doesn't support notification of vfork events. + */ + return 0; +} +#endif + + +#if !defined(CHILD_CAN_FOLLOW_VFORK_PRIOR_TO_EXEC) +int +child_can_follow_vfork_prior_to_exec (void) +{ + /* This version of Unix doesn't support notification of vfork events. + However, if it did, it probably wouldn't allow vforks to be followed + before the following exec. + */ + return 0; +} +#endif + + +#if !defined(CHILD_POST_FOLLOW_VFORK) +void +child_post_follow_vfork (int parent_pid, int followed_parent, int child_pid, + int followed_child) +{ + /* This version of Unix doesn't require a meaningful "post follow vfork" + operation by a clone debugger. + */ +} +#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_HAS_EXECD) +int +child_has_execd (int pid, char **execd_pathname) +{ + /* 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_SYSCALL_EVENT) +int +child_has_syscall_event (int pid, enum target_waitkind *kind, int *syscall_id) +{ + /* This version of Unix doesn't support notification of syscall events. + */ + return 0; +} +#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 + + +static void +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) +{ + extern pid_t inferior_process_group; + + 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; +} + + +#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_require_attach = child_require_attach; + child_ops.to_detach = child_detach; + child_ops.to_require_detach = child_require_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_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_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_clone_and_follow_inferior = child_clone_and_follow_inferior; + child_ops.to_post_follow_inferior_by_clone = child_post_follow_inferior_by_clone; + 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_has_forked = child_has_forked; + child_ops.to_has_vforked = child_has_vforked; + child_ops.to_can_follow_vfork_prior_to_exec = child_can_follow_vfork_prior_to_exec; + child_ops.to_post_follow_vfork = child_post_follow_vfork; + child_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint; + child_ops.to_remove_exec_catchpoint = child_remove_exec_catchpoint; + child_ops.to_has_execd = child_has_execd; + child_ops.to_reported_exec_events_per_exec_call = child_reported_exec_events_per_exec_call; + child_ops.to_has_syscall_event = child_has_syscall_event; + 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 (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 ()); + if ((fd = open (procname, O_RDONLY)) >= 0) + { + close (fd); + return; + } +#endif + + init_child_ops (); + add_target (&child_ops); +} |