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-rw-r--r--gdb/darwin-nat.c1307
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diff --git a/gdb/darwin-nat.c b/gdb/darwin-nat.c
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+/* Darwin support for GDB, the GNU debugger.
+ Copyright (C) 2008 Free Software Foundation, Inc.
+
+ Contributed by AdaCore.
+
+ 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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "defs.h"
+#include "top.h"
+#include "inferior.h"
+#include "target.h"
+#include "symfile.h"
+#include "symtab.h"
+#include "objfiles.h"
+#include "gdb.h"
+#include "gdbcmd.h"
+#include "gdbcore.h"
+#include "gdbthread.h"
+#include "regcache.h"
+#include "event-top.h"
+#include "inf-loop.h"
+#include "gdb_stat.h"
+#include "exceptions.h"
+#include "inf-child.h"
+#include "value.h"
+#include "arch-utils.h"
+#include "bfd.h"
+
+#include <sys/ptrace.h>
+#include <sys/signal.h>
+#include <machine/setjmp.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+#include <ctype.h>
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/proc.h>
+
+#include <mach/mach_error.h>
+#include <mach/mach_vm.h>
+#include <mach/mach_init.h>
+#include <mach/vm_map.h>
+#include <mach/task.h>
+#include <mach/mach_port.h>
+#include <mach/thread_act.h>
+#include <mach/port.h>
+
+#include "darwin-nat.h"
+
+/* Quick overview.
+ Darwin kernel is Mach + BSD derived kernel. Note that they share the
+ same memory space and are linked together (ie there is no micro-kernel).
+
+ Although ptrace(2) is available on Darwin, it is not complete. We have
+ to use Mach calls to read and write memory and to modify registers. We
+ also use Mach to get inferior faults. As we cannot use select(2) or
+ signals with Mach port (the Mach communication channel), signals are
+ reported to gdb as an exception. Furthermore we detect death of the
+ inferior through a Mach notification message. This way we only wait
+ on Mach ports.
+
+ Some Mach documentation is available for Apple xnu source package or
+ from the web. */
+
+
+#define PTRACE(CMD, PID, ADDR, SIG) \
+ darwin_ptrace(#CMD, CMD, (PID), (ADDR), (SIG))
+
+extern boolean_t exc_server (mach_msg_header_t *in, mach_msg_header_t *out);
+
+static void darwin_stop (ptid_t);
+
+static void darwin_resume (ptid_t ptid, int step,
+ enum target_signal signal);
+
+static ptid_t darwin_wait (ptid_t ptid, struct target_waitstatus *status);
+
+static void darwin_mourn_inferior (struct target_ops *ops);
+
+static int darwin_lookup_task (char *args, task_t * ptask, int *ppid);
+
+static void darwin_kill_inferior (void);
+
+static void darwin_ptrace_me (void);
+
+static void darwin_ptrace_him (int pid);
+
+static void darwin_create_inferior (struct target_ops *ops, char *exec_file,
+ char *allargs, char **env, int from_tty);
+
+static void darwin_files_info (struct target_ops *ops);
+
+static char *darwin_pid_to_str (ptid_t tpid);
+
+static int darwin_thread_alive (ptid_t tpid);
+
+/* Current inferior. */
+darwin_inferior *darwin_inf = NULL;
+
+/* Target operations for Darwin. */
+static struct target_ops *darwin_ops;
+
+/* Task identifier of gdb. */
+static task_t gdb_task;
+
+/* A copy of mach_host_self (). */
+mach_port_t darwin_host_self;
+
+/* Exception port. */
+mach_port_t darwin_ex_port;
+
+/* Notification port. */
+mach_port_t darwin_not_port;
+
+/* Port set. */
+mach_port_t darwin_port_set;
+
+/* Page size. */
+static vm_size_t mach_page_size;
+
+/* If Set, catch all mach exceptions (before they are converted to signals
+ by the kernel). */
+static int enable_mach_exceptions;
+
+#define PAGE_TRUNC(x) ((x) & ~(mach_page_size - 1))
+#define PAGE_ROUND(x) PAGE_TRUNC((x) + mach_page_size - 1)
+
+/* Buffer containing received message and to be sent message. */
+static union
+{
+ mach_msg_header_t hdr;
+ char data[1024];
+} msgin, msgout;
+
+/* Current message state.
+ If the kernel has sent a message it expects a reply and the inferior
+ can't be killed before. */
+static enum msg_state { NO_MESSAGE, GOT_MESSAGE, REPLY_SENT } msg_state;
+
+/* Unmarshalled received message. */
+static struct exc_msg
+{
+ /* Receive port. */
+ mach_port_t port;
+
+ /* Thread and task taking the exception. */
+ mach_port_t thread_port;
+ mach_port_t task_port;
+
+ /* Type of the exception. */
+ exception_type_t ex_type;
+
+ /* Machine dependent details. */
+ mach_msg_type_number_t data_count;
+ integer_t ex_data[4];
+} exc_msg;
+
+
+/* This controls output of inferior debugging.
+ 1 = basic exception handling
+ 2 = task management
+ 3 = thread management
+ 4 = pending_event_handler
+ 6 = most chatty level. */
+
+static int darwin_debug_flag = 0;
+
+static void
+inferior_debug (int level, const char *fmt, ...)
+{
+ va_list ap;
+
+ if (darwin_debug_flag < level)
+ return;
+
+ va_start (ap, fmt);
+ printf_unfiltered (_("[%d inferior]: "), getpid ());
+ vprintf_unfiltered (fmt, ap);
+ va_end (ap);
+}
+
+void
+mach_check_error (kern_return_t ret, const char *file,
+ unsigned int line, const char *func)
+{
+ if (ret == KERN_SUCCESS)
+ return;
+ if (func == NULL)
+ func = _("[UNKNOWN]");
+
+ error (_("error on line %u of \"%s\" in function \"%s\": %s (0x%lx)\n"),
+ line, file, func, mach_error_string (ret), (unsigned long) ret);
+}
+
+static const char *
+unparse_exception_type (unsigned int i)
+{
+ static char unknown_exception_buf[32];
+
+ switch (i)
+ {
+ case EXC_BAD_ACCESS:
+ return "EXC_BAD_ACCESS";
+ case EXC_BAD_INSTRUCTION:
+ return "EXC_BAD_INSTRUCTION";
+ case EXC_ARITHMETIC:
+ return "EXC_ARITHMETIC";
+ case EXC_EMULATION:
+ return "EXC_EMULATION";
+ case EXC_SOFTWARE:
+ return "EXC_SOFTWARE";
+ case EXC_BREAKPOINT:
+ return "EXC_BREAKPOINT";
+ case EXC_SYSCALL:
+ return "EXC_SYSCALL";
+ case EXC_MACH_SYSCALL:
+ return "EXC_MACH_SYSCALL";
+ case EXC_RPC_ALERT:
+ return "EXC_RPC_ALERT";
+ case EXC_CRASH:
+ return "EXC_CRASH";
+ default:
+ snprintf (unknown_exception_buf, 32, _("unknown (%d)"), i);
+ return unknown_exception_buf;
+ }
+}
+
+static int
+darwin_ptrace (const char *name,
+ int request, int pid, PTRACE_TYPE_ARG3 arg3, int arg4)
+{
+ int ret;
+
+ ret = ptrace (request, pid, (caddr_t) arg3, arg4);
+
+ inferior_debug (2, _("ptrace (%s, %d, 0x%x, %d): %d (%s)\n"),
+ name, pid, arg3, arg4, ret,
+ (ret != 0) ? strerror (errno) : _("no error"));
+ return ret;
+}
+
+static int
+cmp_thread_t (const void *l, const void *r)
+{
+ thread_t lt = *(const thread_t *)l;
+ thread_t lr = *(const thread_t *)r;
+ return (int)(lr - lt);
+}
+
+static void
+darwin_check_new_threads (darwin_inferior *inf)
+{
+ kern_return_t kret;
+ unsigned int i;
+ thread_array_t thread_list;
+ unsigned int new_nbr;
+ unsigned int old_nbr;
+ unsigned int new_ix, old_ix;
+ VEC (thread_t) *thread_vec;
+
+ /* Get list of threads. */
+ kret = task_threads (inf->task, &thread_list, &new_nbr);
+ MACH_CHECK_ERROR (kret);
+ if (kret != KERN_SUCCESS)
+ return;
+
+ if (new_nbr > 1)
+ qsort (thread_list, new_nbr, sizeof (thread_t), cmp_thread_t);
+
+ thread_vec = VEC_alloc (thread_t, new_nbr);
+
+ if (inf->threads)
+ old_nbr = VEC_length (thread_t, inf->threads);
+ else
+ old_nbr = 0;
+
+ for (new_ix = 0, old_ix = 0; new_ix < new_nbr || old_ix < old_nbr;)
+ {
+ thread_t new_id = (new_ix < new_nbr) ?
+ thread_list[new_ix] : THREAD_NULL;
+ thread_t old_id = (old_ix < old_nbr) ?
+ VEC_index (thread_t, inf->threads, old_ix) : THREAD_NULL;
+
+ if (old_id == new_id)
+ {
+ /* Thread still exist. */
+ VEC_safe_push (thread_t, thread_vec, old_id);
+ new_ix++;
+ old_ix++;
+
+ kret = mach_port_deallocate (gdb_task, old_id);
+ MACH_CHECK_ERROR (kret);
+ continue;
+ }
+ if (new_id < old_id || old_ix == old_nbr)
+ {
+ /* A thread was created. */
+ struct thread_info *tp;
+
+ tp = add_thread (ptid_build (inf->pid, 0, new_id));
+ VEC_safe_push (thread_t, thread_vec, new_id);
+ new_ix++;
+ continue;
+ }
+ if (new_id > old_id || new_ix == new_nbr)
+ {
+ /* A thread was removed. */
+ delete_thread (ptid_build (inf->pid, 0, old_id));
+ kret = mach_port_deallocate (gdb_task, old_id);
+ MACH_CHECK_ERROR (kret);
+ old_ix++;
+ }
+ }
+
+ if (inf->threads)
+ VEC_free (thread_t, inf->threads);
+ inf->threads = thread_vec;
+
+ kret = vm_deallocate (gdb_task, (vm_address_t) thread_list,
+ new_nbr * sizeof (int));
+ MACH_CHECK_ERROR (kret);
+}
+
+static void
+darwin_stop (ptid_t t)
+{
+ int ret;
+
+ ret = kill (ptid_get_pid (inferior_ptid), SIGINT);
+}
+
+static void
+darwin_resume (ptid_t ptid, int step, enum target_signal signal)
+{
+ struct target_waitstatus status;
+ int pid;
+ thread_t thread;
+ kern_return_t kret;
+ int res;
+
+ /* minus_one_ptid is RESUME_ALL. */
+ if (ptid_equal (ptid, minus_one_ptid))
+ ptid = inferior_ptid;
+
+ pid = ptid_get_pid (ptid);
+ thread = ptid_get_tid (ptid);
+
+ inferior_debug
+ (2, _("darwin_resume: state=%d, thread=0x%x, step=%d signal=%d\n"),
+ msg_state, thread, step, signal);
+
+ switch (msg_state)
+ {
+ case GOT_MESSAGE:
+ switch (exc_msg.ex_type)
+ {
+ case EXC_SOFTWARE:
+ if (exc_msg.ex_data[0] == EXC_SOFT_SIGNAL)
+ {
+ int nsignal = target_signal_to_host (signal);
+ res = PTRACE (PT_THUPDATE, pid,
+ (void *)exc_msg.thread_port, nsignal);
+ if (res < 0)
+ printf_unfiltered (_("ptrace THUP: res=%d\n"), res);
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ if (thread != 0)
+ {
+ inferior_debug (2, _("darwin_set_sstep (thread=%x, enable=%d)\n"),
+ thread, step);
+ darwin_set_sstep (thread, step);
+ }
+
+ kret = mach_msg (&msgout.hdr, MACH_SEND_MSG | MACH_SEND_INTERRUPT,
+ msgout.hdr.msgh_size, 0,
+ MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE,
+ MACH_PORT_NULL);
+ if (kret != 0)
+ printf_unfiltered (_("mach_msg (reply) ret=%d\n"), kret);
+
+ msg_state = REPLY_SENT;
+ break;
+
+ case NO_MESSAGE:
+ if (step)
+ res = PTRACE (PT_STEP, pid, (caddr_t)1, 0);
+ else
+ res = PTRACE (PT_CONTINUE, pid, (caddr_t)1, 0);
+ break;
+
+ default:
+ gdb_assert (0);
+ }
+}
+
+kern_return_t
+catch_exception_raise_state
+ (mach_port_t port,
+ exception_type_t exception_type, mach_exception_data_t exception_data,
+ mach_msg_type_number_t data_count, thread_state_flavor_t * state_flavor,
+ thread_state_t in_state, mach_msg_type_number_t in_state_count,
+ thread_state_t out_state, mach_msg_type_number_t out_state_count)
+{
+ return KERN_FAILURE;
+}
+
+kern_return_t
+catch_exception_raise_state_identity
+ (mach_port_t port, mach_port_t thread_port, mach_port_t task_port,
+ exception_type_t exception_type, mach_exception_data_t exception_data,
+ mach_msg_type_number_t data_count, thread_state_flavor_t * state_flavor,
+ thread_state_t in_state, mach_msg_type_number_t in_state_count,
+ thread_state_t out_state, mach_msg_type_number_t out_state_count)
+{
+ kern_return_t kret;
+
+ kret = mach_port_deallocate (mach_task_self (), task_port);
+ MACH_CHECK_ERROR (kret);
+ kret = mach_port_deallocate (mach_task_self (), thread_port);
+ MACH_CHECK_ERROR (kret);
+
+ return KERN_FAILURE;
+}
+
+kern_return_t
+catch_exception_raise (mach_port_t port,
+ mach_port_t thread_port,
+ mach_port_t task_port,
+ exception_type_t exception_type,
+ exception_data_t exception_data,
+ mach_msg_type_number_t data_count)
+{
+ kern_return_t kret;
+ int i;
+ int res;
+
+ /* We got new rights to the task. Get rid of it. */
+ kret = mach_port_deallocate (mach_task_self (), task_port);
+ MACH_CHECK_ERROR (kret);
+
+ inferior_debug
+ (7, _("catch_exception_raise: exception_type=%d, data_count=%d\n"),
+ exception_type, data_count);
+ if (darwin_debug_flag > 7)
+ {
+ for (i = 0; i < data_count; i++)
+ printf_unfiltered (" %08x", exception_data[i]);
+ printf_unfiltered ("\n");
+ }
+
+ /* Save the message.
+ FIXME: this should be in a per-thread variable. */
+ exc_msg.port = port;
+ exc_msg.thread_port = thread_port;
+ exc_msg.task_port = task_port;
+ exc_msg.ex_type = exception_type;
+ exc_msg.data_count = data_count;
+ for (i = 0; i < data_count && i < 4; i++)
+ exc_msg.ex_data[i] = exception_data[i];
+
+ return KERN_SUCCESS;
+}
+
+static ptid_t
+darwin_wait (ptid_t ptid, struct target_waitstatus *status)
+{
+ kern_return_t kret;
+ mach_msg_header_t *hdr = &msgin.hdr;
+ pid_t pid = ptid_get_pid (inferior_ptid); /* FIXME. */
+
+ gdb_assert (msg_state != GOT_MESSAGE);
+
+ inferior_debug (6, _("darwin_wait: waiting for a message\n"));
+
+ /* Wait for a message. */
+ kret = mach_msg (&msgin.hdr, MACH_RCV_MSG | MACH_RCV_INTERRUPT, 0,
+ sizeof (msgin.data), darwin_port_set, 0, MACH_PORT_NULL);
+
+ if (kret == MACH_RCV_INTERRUPTED)
+ {
+ status->kind = TARGET_WAITKIND_IGNORE;
+ return minus_one_ptid;
+ }
+
+ if (kret != MACH_MSG_SUCCESS)
+ {
+ inferior_debug (1, _("mach_msg: ret=%x\n"), kret);
+ status->kind = TARGET_WAITKIND_SPURIOUS;
+ return minus_one_ptid;
+ }
+
+ /* Debug: display message. */
+ if (darwin_debug_flag > 10)
+ {
+ const unsigned long *buf = (unsigned long *) hdr;
+ unsigned int i;
+
+ printf_unfiltered (_(" bits: 0x%x"), hdr->msgh_bits);
+ printf_unfiltered (_(", size: 0x%x"), hdr->msgh_size);
+ printf_unfiltered (_(", remote-port: 0x%x"), hdr->msgh_remote_port);
+ printf_unfiltered (_(", local-port: 0x%x"), hdr->msgh_local_port);
+ printf_unfiltered (_(", reserved: 0x%x"), hdr->msgh_reserved);
+ printf_unfiltered (_(", id: 0x%x\n"), hdr->msgh_id);
+
+ if (darwin_debug_flag > 11)
+ {
+ printf_unfiltered (_(" data:"));
+ for (i = 0; i < hdr->msgh_size; i++)
+ printf_unfiltered (" %08lx", buf[i]);
+ printf_unfiltered (_("\n"));
+ }
+ }
+
+ /* Exception message. */
+ if (hdr->msgh_local_port == darwin_ex_port)
+ {
+ /* Handle it via the exception server. */
+ if (!exc_server (&msgin.hdr, &msgout.hdr))
+ {
+ printf_unfiltered (_("exc_server: unknown message (id=%x)\n"),
+ hdr->msgh_id);
+ status->kind = TARGET_WAITKIND_SPURIOUS;
+ return minus_one_ptid;
+ }
+
+ status->kind = TARGET_WAITKIND_STOPPED;
+
+ inferior_debug (2, _("darwin_wait: thread=%x, got %s\n"),
+ exc_msg.thread_port,
+ unparse_exception_type (exc_msg.ex_type));
+
+ switch (exc_msg.ex_type)
+ {
+ case EXC_BAD_ACCESS:
+ status->value.sig = TARGET_EXC_BAD_ACCESS;
+ break;
+ case EXC_BAD_INSTRUCTION:
+ status->value.sig = TARGET_EXC_BAD_INSTRUCTION;
+ break;
+ case EXC_ARITHMETIC:
+ status->value.sig = TARGET_EXC_ARITHMETIC;
+ break;
+ case EXC_EMULATION:
+ status->value.sig = TARGET_EXC_EMULATION;
+ break;
+ case EXC_SOFTWARE:
+ if (exc_msg.ex_data[0] == EXC_SOFT_SIGNAL)
+ {
+ status->value.sig = target_signal_from_host (exc_msg.ex_data[1]);
+ inferior_debug (2, _(" (signal %d: %s)\n"),
+ exc_msg.ex_data[1],
+ target_signal_to_name (status->value.sig));
+ }
+ else
+ status->value.sig = TARGET_EXC_SOFTWARE;
+ break;
+ case EXC_BREAKPOINT:
+ /* Many internal GDB routines expect breakpoints to be reported
+ as TARGET_SIGNAL_TRAP, and will report TARGET_EXC_BREAKPOINT
+ as a spurious signal. */
+ status->value.sig = TARGET_SIGNAL_TRAP;
+ break;
+ default:
+ status->value.sig = TARGET_SIGNAL_UNKNOWN;
+ break;
+ }
+
+ msg_state = GOT_MESSAGE;
+
+ return ptid_build (pid, 0, exc_msg.thread_port);
+ }
+ else if (hdr->msgh_local_port == darwin_not_port)
+ {
+ pid_t res;
+ int wstatus;
+
+ /* FIXME: translate task port to pid. */
+ res = wait4 (pid, &wstatus, 0, NULL);
+ if (res != pid)
+ {
+ printf_unfiltered (_("wait4: res=%x\n"), res);
+ wstatus = 0;
+ }
+ status->kind = TARGET_WAITKIND_EXITED;
+ status->value.integer = WEXITSTATUS (wstatus);
+
+ inferior_debug (2, _("darwin_wait: pid=%d exit, status=%x\n"),
+ pid, wstatus);
+
+ msg_state = NO_MESSAGE;
+
+ return ptid;
+ }
+ else
+ {
+ printf_unfiltered (_("Bad local-port: %x\n"), hdr->msgh_local_port);
+ status->kind = TARGET_WAITKIND_SPURIOUS;
+ return minus_one_ptid;
+ }
+}
+
+static void
+darwin_mourn_inferior (struct target_ops *ops)
+{
+ struct inferior *inf = current_inferior ();
+ kern_return_t kret;
+ mach_port_t prev;
+ int i;
+
+ unpush_target (darwin_ops);
+
+ /* Deallocate threads. */
+ if (darwin_inf->threads)
+ {
+ int k;
+ thread_t t;
+ for (k = 0; VEC_iterate (thread_t, darwin_inf->threads, k, t); k++)
+ {
+ kret = mach_port_deallocate (gdb_task, t);
+ MACH_CHECK_ERROR (kret);
+ }
+ VEC_free (thread_t, darwin_inf->threads);
+ darwin_inf->threads = NULL;
+ }
+
+ kret = mach_port_request_notification (gdb_task, darwin_inf->task,
+ MACH_NOTIFY_DEAD_NAME, 0,
+ darwin_inf->prev_not_port,
+ MACH_MSG_TYPE_MAKE_SEND_ONCE,
+ &prev);
+ /* This can fail if the task is dead. */
+ if (kret == KERN_SUCCESS)
+ {
+ kret = mach_port_deallocate (gdb_task, prev);
+ MACH_CHECK_ERROR (kret);
+ }
+
+ /* Deallocate saved exception ports. */
+ for (i = 0; i < darwin_inf->exception_info.count; i++)
+ {
+ kret = mach_port_deallocate
+ (gdb_task, darwin_inf->exception_info.ports[i]);
+ MACH_CHECK_ERROR (kret);
+ }
+ darwin_inf->exception_info.count = 0;
+
+ kret = mach_port_deallocate (gdb_task, darwin_inf->task);
+ MACH_CHECK_ERROR (kret);
+
+ darwin_inf->task = 0;
+ darwin_inf->pid = 0;
+
+ generic_mourn_inferior ();
+}
+
+static void
+darwin_stop_inferior (darwin_inferior *inf)
+{
+ struct target_waitstatus wstatus;
+ ptid_t ptid;
+ kern_return_t kret;
+ int status;
+ int res;
+
+ gdb_assert (inf != NULL);
+
+ kret = task_suspend (inf->task);
+ MACH_CHECK_ERROR (kret);
+
+ if (msg_state == GOT_MESSAGE)
+ darwin_resume (inferior_ptid, 0, 0);
+
+ res = kill (inf->pid, SIGSTOP);
+ if (res != 0)
+ warning (_("cannot kill: %s\n"), strerror (errno));
+
+ ptid = darwin_wait (inferior_ptid, &wstatus);
+ gdb_assert (wstatus.kind = TARGET_WAITKIND_STOPPED);
+}
+
+static void
+darwin_kill_inferior (void)
+{
+ struct target_waitstatus wstatus;
+ ptid_t ptid;
+ kern_return_t kret;
+ int status;
+ int res;
+
+ gdb_assert (darwin_inf != NULL);
+
+ if (ptid_equal (inferior_ptid, null_ptid))
+ return;
+
+ darwin_stop_inferior (darwin_inf);
+
+ res = PTRACE (PT_KILL, darwin_inf->pid, 0, 0);
+ gdb_assert (res == 0);
+
+ if (msg_state == GOT_MESSAGE)
+ {
+ exc_msg.ex_type = 0;
+ darwin_resume (inferior_ptid, 0, 0);
+ }
+
+ kret = task_resume (darwin_inf->task);
+ MACH_CHECK_ERROR (kret);
+
+ ptid = darwin_wait (inferior_ptid, &wstatus);
+
+ /* This double wait seems required... */
+ res = waitpid (darwin_inf->pid, &status, 0);
+ gdb_assert (res == darwin_inf->pid);
+
+ msg_state = NO_MESSAGE;
+
+ target_mourn_inferior ();
+}
+
+/* The child must synchronize with gdb: gdb must set the exception port
+ before the child call PTRACE_SIGEXC. We use a pipe to achieve this.
+ FIXME: is there a lighter way ? */
+static int ptrace_fds[2];
+
+static void
+darwin_ptrace_me (void)
+{
+ int res;
+ char c;
+
+ /* Close write end point. */
+ close (ptrace_fds[1]);
+
+ /* Wait until gdb is ready. */
+ res = read (ptrace_fds[0], &c, 1);
+ gdb_assert (res == 0);
+ close (ptrace_fds[0]);
+
+ /* Get rid of privileges. */
+ setegid (getgid ());
+
+ /* Set TRACEME. */
+ PTRACE (PT_TRACE_ME, 0, 0, 0);
+
+ /* Redirect signals to exception port. */
+ PTRACE (PT_SIGEXC, 0, 0, 0);
+}
+
+/* Dummy function to be sure fork_inferior uses fork(2) and not vfork(2). */
+static void
+darwin_pre_ptrace (void)
+{
+ if (pipe (ptrace_fds) != 0)
+ {
+ ptrace_fds[0] = -1;
+ ptrace_fds[1] = -1;
+ error (_("unable to create a pipe: %s"), safe_strerror (errno));
+ }
+}
+
+static kern_return_t
+darwin_save_exception_ports (darwin_inferior *inf)
+{
+ kern_return_t kret;
+
+ inf->exception_info.count =
+ sizeof (inf->exception_info.ports) / sizeof (inf->exception_info.ports[0]);
+
+ kret = task_get_exception_ports
+ (inf->task, EXC_MASK_ALL, inf->exception_info.masks,
+ &inf->exception_info.count, inf->exception_info.ports,
+ inf->exception_info.behaviors, inf->exception_info.flavors);
+ return kret;
+}
+
+static kern_return_t
+darwin_restore_exception_ports (darwin_inferior *inf)
+{
+ int i;
+ kern_return_t kret;
+
+ for (i = 0; i < inf->exception_info.count; i++)
+ {
+ kret = task_set_exception_ports
+ (inf->task, inf->exception_info.masks[i], inf->exception_info.ports[i],
+ inf->exception_info.behaviors[i], inf->exception_info.flavors[i]);
+ if (kret != KERN_SUCCESS)
+ return kret;
+ }
+
+ return KERN_SUCCESS;
+}
+
+static void
+darwin_attach_pid (int pid)
+{
+ task_t itask;
+ kern_return_t kret;
+ mach_port_t prev_port;
+ int traps_expected;
+ exception_mask_t mask;
+
+ kret = task_for_pid (gdb_task, pid, &itask);
+ if (kret != KERN_SUCCESS)
+ {
+ int status;
+ struct inferior *inf = current_inferior ();
+
+ if (!inf->attach_flag)
+ {
+ kill (pid, 9);
+ waitpid (pid, &status, 0);
+ }
+
+ error (_("Unable to find Mach task port for process-id %d: %s (0x%lx).\n"
+ " (please check gdb is setgid procmod)"),
+ pid, mach_error_string (kret), (unsigned long) kret);
+ }
+
+ inferior_debug (2, _("inferior task: 0x%08x, pid: %d\n"), itask, pid);
+
+ if (darwin_ex_port == MACH_PORT_NULL)
+ {
+ /* Create a port to get exceptions. */
+ kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_RECEIVE,
+ &darwin_ex_port);
+ gdb_assert (kret == KERN_SUCCESS);
+
+ kret = mach_port_insert_right (gdb_task, darwin_ex_port, darwin_ex_port,
+ MACH_MSG_TYPE_MAKE_SEND);
+ gdb_assert (kret == KERN_SUCCESS);
+
+ /* Create a port set and put ex_port in it. */
+ kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_PORT_SET,
+ &darwin_port_set);
+ gdb_assert (kret == KERN_SUCCESS);
+
+ kret = mach_port_move_member (gdb_task, darwin_ex_port, darwin_port_set);
+ gdb_assert (kret == KERN_SUCCESS);
+
+ /* Create a port to be notified when the child task terminates. */
+ kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_RECEIVE,
+ &darwin_not_port);
+ gdb_assert (kret == KERN_SUCCESS);
+
+ kret = mach_port_insert_right (gdb_task, darwin_not_port, darwin_not_port,
+ MACH_MSG_TYPE_MAKE_SEND);
+ gdb_assert (kret == KERN_SUCCESS);
+
+ kret = mach_port_move_member (gdb_task, darwin_not_port, darwin_port_set);
+ gdb_assert (kret == KERN_SUCCESS);
+ }
+
+ kret = mach_port_request_notification (gdb_task, itask,
+ MACH_NOTIFY_DEAD_NAME, 0,
+ darwin_not_port,
+ MACH_MSG_TYPE_MAKE_SEND_ONCE,
+ &darwin_inf->prev_not_port);
+ gdb_assert (kret == KERN_SUCCESS);
+
+ darwin_inf->task = itask;
+ darwin_inf->pid = pid;
+
+ kret = darwin_save_exception_ports (darwin_inf);
+ gdb_assert (kret == KERN_SUCCESS);
+
+ /* Set exception port. */
+ if (enable_mach_exceptions)
+ mask = EXC_MASK_ALL;
+ else
+ mask = EXC_MASK_SOFTWARE;
+ kret = task_set_exception_ports
+ (itask, mask, darwin_ex_port, EXCEPTION_DEFAULT, THREAD_STATE_NONE);
+ gdb_assert (kret == KERN_SUCCESS);
+
+ push_target (darwin_ops);
+}
+
+static void
+darwin_init_thread_list (darwin_inferior *inf)
+{
+ thread_t thread;
+
+ darwin_check_new_threads (inf);
+
+ gdb_assert (inf->threads && VEC_length (thread_t, inf->threads) > 0);
+ thread = VEC_index (thread_t, inf->threads, 0);
+ inferior_ptid = ptid_build (inf->pid, 0, thread);
+}
+
+static void
+darwin_ptrace_him (int pid)
+{
+ task_t itask;
+ kern_return_t kret;
+ mach_port_t prev_port;
+ int traps_expected;
+
+ darwin_attach_pid (pid);
+
+ /* Let's the child run. */
+ close (ptrace_fds[0]);
+ close (ptrace_fds[1]);
+
+ /* fork_inferior automatically add a thread - but it uses a wrong tid. */
+ delete_thread_silent (inferior_ptid);
+ darwin_init_thread_list (darwin_inf);
+
+ startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
+}
+
+static void
+darwin_create_inferior (struct target_ops *ops, char *exec_file,
+ char *allargs, char **env, int from_tty)
+{
+ /* Do the hard work. */
+ fork_inferior (exec_file, allargs, env, darwin_ptrace_me, darwin_ptrace_him,
+ darwin_pre_ptrace, NULL);
+
+ /* Return now in case of error. */
+ if (ptid_equal (inferior_ptid, null_ptid))
+ return;
+}
+
+
+/* Attach to process PID, then initialize for debugging it
+ and wait for the trace-trap that results from attaching. */
+static void
+darwin_attach (struct target_ops *ops, char *args, int from_tty)
+{
+ pid_t pid;
+ pid_t pid2;
+ int wstatus;
+ int res;
+ struct inferior *inf;
+
+ gdb_assert (msg_state == NO_MESSAGE);
+
+ if (!args)
+ error_no_arg (_("process-id to attach"));
+
+ pid = atoi (args);
+
+ if (pid == getpid ()) /* Trying to masturbate? */
+ error (_("I refuse to debug myself!"));
+
+ if (from_tty)
+ printf_unfiltered (_("Attaching to pid %d\n"), pid);
+
+ res = PTRACE (PT_ATTACHEXC, pid, 0, 0);
+ if (res != 0)
+ error (_("Unable to attach to process-id %d: %s (%d)"),
+ pid, strerror (errno), errno);
+
+ inf = add_inferior (pid);
+ inf->attach_flag = 1;
+
+ darwin_attach_pid (pid);
+
+ pid2 = wait4 (pid, &wstatus, WUNTRACED, NULL);
+ gdb_assert (pid2 == pid);
+ inferior_debug (1, _("darwin_attach: wait4 pid=%d, status=0x%x\n"),
+ pid2, wstatus);
+
+
+ darwin_init_thread_list (darwin_inf);
+
+ darwin_check_osabi (darwin_inf, ptid_get_tid (inferior_ptid));
+
+ /* Looks strange, but the kernel doesn't stop the process...
+ (Bug in Leopard ?)
+ Do it manually. */
+ /* FIXME: doesn't look to work with multi-threads!! */
+ kill (pid, SIGSTOP);
+}
+
+/* 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 fork. */
+static void
+darwin_detach (struct target_ops *ops, char *args, int from_tty)
+{
+ kern_return_t kret;
+ int res;
+
+ if (from_tty)
+ {
+ char *exec_file = get_exec_file (0);
+ if (exec_file == 0)
+ exec_file = "";
+ printf_unfiltered (_("Detaching from program: %s, %d\n"), exec_file,
+ ptid_get_pid (inferior_ptid));
+ gdb_flush (gdb_stdout);
+ }
+
+ darwin_stop_inferior (darwin_inf);
+
+ kret = darwin_restore_exception_ports (darwin_inf);
+ MACH_CHECK_ERROR (kret);
+
+ if (msg_state == GOT_MESSAGE)
+ {
+ exc_msg.ex_type = 0;
+ darwin_resume (inferior_ptid, 0, 0);
+ }
+
+ kret = task_resume (darwin_inf->task);
+ gdb_assert (kret == KERN_SUCCESS);
+
+ res = PTRACE (PT_DETACH, darwin_inf->pid, 0, 0);
+ if (res != 0)
+ printf_unfiltered (_("Unable to detach from process-id %d: %s (%d)"),
+ darwin_inf->pid, strerror (errno), errno);
+
+ msg_state = NO_MESSAGE;
+
+ darwin_mourn_inferior (ops);
+}
+
+static void
+darwin_files_info (struct target_ops *ops)
+{
+ gdb_assert (darwin_inf != NULL);
+}
+
+static char *
+darwin_pid_to_str (ptid_t ptid)
+{
+ static char buf[128];
+
+ snprintf (buf, sizeof (buf),
+ _("process %d gdb-thread 0x%lx"),
+ (unsigned) ptid_get_pid (ptid),
+ (unsigned long) ptid_get_tid (ptid));
+ return buf;
+}
+
+static int
+darwin_thread_alive (ptid_t ptid)
+{
+ return 1;
+}
+
+/* If RDADDR is not NULL, read inferior task's LEN bytes from ADDR and
+ copy it to RDADDR in gdb's address space.
+ If WRADDR is not NULL, write gdb's LEN bytes from WRADDR and copy it
+ to ADDR in inferior task's address space.
+ Return 0 on failure; number of bytes read / writen otherwise. */
+static int
+darwin_read_write_inferior (task_t task, CORE_ADDR addr,
+ char *rdaddr, const char *wraddr, int length)
+{
+ kern_return_t err;
+ mach_vm_address_t offset = addr & (mach_page_size - 1);
+ mach_vm_address_t low_address = (mach_vm_address_t) (addr - offset);
+ mach_vm_size_t aligned_length = (mach_vm_size_t) PAGE_ROUND (offset + length);
+ pointer_t copied;
+ int copy_count;
+ mach_vm_size_t remaining_length;
+ mach_vm_address_t region_address;
+ mach_vm_size_t region_length;
+
+ inferior_debug (8, _("darwin_read_write_inferior(%s, len=%d)\n"),
+ core_addr_to_string (addr), length);
+
+ /* Get memory from inferior with page aligned addresses */
+ err = mach_vm_read (task, low_address, aligned_length,
+ &copied, &copy_count);
+ if (err != KERN_SUCCESS)
+ {
+ warning (_("darwin_read_write_inferior: vm_read failed: %s"),
+ mach_error_string (err));
+ return 0;
+ }
+
+ if (rdaddr != NULL)
+ memcpy (rdaddr, (char *)copied + offset, length);
+
+ if (wraddr == NULL)
+ goto out;
+
+ memcpy ((char *)copied + offset, wraddr, length);
+
+ /* Do writes atomically.
+ First check for holes and unwritable memory. */
+ for (region_address = low_address, remaining_length = aligned_length;
+ region_address < low_address + aligned_length;
+ region_address += region_length, remaining_length -= region_length)
+ {
+ vm_region_basic_info_data_64_t info;
+ mach_port_t object_name;
+ mach_vm_address_t old_address = region_address;
+ mach_msg_type_number_t count;
+
+ region_length = remaining_length;
+ count = VM_REGION_BASIC_INFO_COUNT_64;
+ err = mach_vm_region (task, &region_address, &region_length,
+ VM_REGION_BASIC_INFO_64,
+ (vm_region_info_t) &info, &count, &object_name);
+
+ if (err != KERN_SUCCESS)
+ {
+ warning (_("darwin_write_inferior: mach_vm_region failed: %s"),
+ mach_error_string (err));
+ goto out;
+ }
+
+ /* Check for holes in memory */
+ if (region_address > old_address)
+ {
+ warning (_("No memory at %s (vs %s+0x%x). Nothing written"),
+ core_addr_to_string (old_address),
+ core_addr_to_string (region_address),
+ (unsigned)region_length);
+ length = 0;
+ goto out;
+ }
+
+ if (!(info.max_protection & VM_PROT_WRITE))
+ {
+ warning (_("Memory at address %s is unwritable. Nothing written"),
+ core_addr_to_string (old_address));
+ length = 0;
+ goto out;
+ }
+
+ if (!(info.protection & VM_PROT_WRITE))
+ {
+ err = mach_vm_protect (task, old_address, region_length,
+ FALSE, info.protection | VM_PROT_WRITE);
+ if (err != KERN_SUCCESS)
+ {
+ warning
+ (_("darwin_read_write_inferior: mach_vm_protect failed: %s"),
+ mach_error_string (err));
+ length = 0;
+ goto out;
+ }
+ }
+ }
+
+ err = mach_vm_write (task, low_address, copied, aligned_length);
+
+ if (err != KERN_SUCCESS)
+ {
+ warning (_("darwin_read_write_inferior: mach_vm_write failed: %s"),
+ mach_error_string (err));
+ length = 0;
+ }
+out:
+ mach_vm_deallocate (mach_task_self (), copied, copy_count);
+ return length;
+}
+
+
+/* Return 0 on failure, number of bytes handled otherwise. TARGET
+ is ignored. */
+static int
+darwin_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int write,
+ struct mem_attrib *attrib, struct target_ops *target)
+{
+ task_t task = darwin_inf->task;
+
+ if (task == MACH_PORT_NULL)
+ return 0;
+
+ inferior_debug (8, _("darwin_xfer_memory(%s, %d, %c)\n"),
+ core_addr_to_string (memaddr), len, write ? 'w' : 'r');
+
+ if (write)
+ return darwin_read_write_inferior (task, memaddr, NULL, myaddr, len);
+ else
+ return darwin_read_write_inferior (task, memaddr, myaddr, NULL, len);
+}
+
+static LONGEST
+darwin_xfer_partial (struct target_ops *ops,
+ enum target_object object, const char *annex,
+ gdb_byte *readbuf, const gdb_byte *writebuf,
+ ULONGEST offset, LONGEST len)
+{
+ inferior_debug (8, _("darwin_xfer_partial(%s, %d, rbuf=%p, wbuf=%p)\n"),
+ core_addr_to_string (offset), (int)len, readbuf, writebuf);
+
+ if (object != TARGET_OBJECT_MEMORY)
+ return -1;
+
+ return darwin_read_write_inferior (darwin_inf->task, offset,
+ readbuf, writebuf, len);
+}
+
+static void
+set_enable_mach_exceptions (char *args, int from_tty,
+ struct cmd_list_element *c)
+{
+ if (darwin_inf && darwin_inf->task != TASK_NULL)
+ {
+ exception_mask_t mask;
+ kern_return_t kret;
+
+ if (enable_mach_exceptions)
+ mask = EXC_MASK_ALL;
+ else
+ {
+ darwin_restore_exception_ports (darwin_inf);
+ mask = EXC_MASK_SOFTWARE;
+ }
+ kret = task_set_exception_ports (darwin_inf->task, mask, darwin_ex_port,
+ EXCEPTION_DEFAULT, THREAD_STATE_NONE);
+ MACH_CHECK_ERROR (kret);
+ }
+}
+
+void
+_initialize_darwin_inferior ()
+{
+ kern_return_t kret;
+
+ gdb_assert (darwin_inf == NULL);
+
+ gdb_task = mach_task_self ();
+ darwin_host_self = mach_host_self ();
+
+ /* Read page size. */
+ kret = host_page_size (darwin_host_self, &mach_page_size);
+ if (kret != KERN_SUCCESS)
+ {
+ mach_page_size = 0x1000;
+ MACH_CHECK_ERROR (kret);
+ }
+
+ darwin_inf = (struct darwin_inferior *)
+ xmalloc (sizeof (struct darwin_inferior));
+
+ memset (darwin_inf, 0, sizeof (*darwin_inf));
+
+ darwin_ops = inf_child_target ();
+
+ darwin_ops->to_shortname = "darwin-child";
+ darwin_ops->to_longname = _("Darwin child process");
+ darwin_ops->to_doc =
+ _("Darwin child process (started by the \"run\" command).");
+ darwin_ops->to_create_inferior = darwin_create_inferior;
+ darwin_ops->to_attach = darwin_attach;
+ darwin_ops->to_attach_no_wait = 0;
+ darwin_ops->to_detach = darwin_detach;
+ darwin_ops->to_files_info = darwin_files_info;
+ darwin_ops->to_wait = darwin_wait;
+ darwin_ops->to_mourn_inferior = darwin_mourn_inferior;
+ darwin_ops->to_kill = darwin_kill_inferior;
+ darwin_ops->to_stop = darwin_stop;
+ darwin_ops->to_resume = darwin_resume;
+ darwin_ops->to_thread_alive = darwin_thread_alive;
+ darwin_ops->to_pid_to_str = darwin_pid_to_str;
+ darwin_ops->to_load = NULL;
+ darwin_ops->deprecated_xfer_memory = darwin_xfer_memory;
+ darwin_ops->to_xfer_partial = darwin_xfer_partial;
+ darwin_ops->to_has_thread_control = tc_schedlock /*| tc_switch */;
+
+ darwin_complete_target (darwin_ops);
+
+ add_target (darwin_ops);
+
+ inferior_debug (2, _("GDB task: 0x%lx, pid: %d\n"), mach_task_self (),
+ getpid ());
+
+ add_setshow_zinteger_cmd ("darwin", class_obscure,
+ &darwin_debug_flag, _("\
+Set if printing inferior communication debugging statements."), _("\
+Show if printing inferior communication debugging statements."), NULL,
+ NULL, NULL,
+ &setdebuglist, &showdebuglist);
+
+ add_setshow_boolean_cmd ("mach-exceptions", class_support,
+ &enable_mach_exceptions, _("\
+Set if mach exceptions are caught."), _("\
+Show if mach exceptions are caught."), _("\
+When this mode is on, all low level exceptions are reported before being\n\
+reported by the kernel."),
+ &set_enable_mach_exceptions, NULL,
+ &setlist, &showlist);
+}
generated by cgit v1.1 at 2024-12-17 06:46:50 +0000