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darwin-nat.c
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/* Darwin support for GDB, the GNU debugger.
Copyright (C) 2008-2015 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 <sys/stat.h>
#include "inf-child.h"
#include "value.h"
#include "arch-utils.h"
#include "bfd.h"
#include "bfd/mach-o.h"
#include <sys/ptrace.h>
#include <sys/signal.h>
#include <setjmp.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <ctype.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <libproc.h>
#include <sys/syscall.h>
#include <spawn.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"
#include "common/filestuff.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))
static void darwin_interrupt (struct target_ops *self, ptid_t);
static void darwin_resume_to (struct target_ops *ops, ptid_t ptid, int step,
enum gdb_signal signal);
static void darwin_resume (ptid_t ptid, int step,
enum gdb_signal signal);
static ptid_t darwin_wait_to (struct target_ops *ops, ptid_t ptid,
struct target_waitstatus *status, int options);
static ptid_t darwin_wait (ptid_t ptid, struct target_waitstatus *status);
static void darwin_mourn_inferior (struct target_ops *ops);
static void darwin_kill_inferior (struct target_ops *ops);
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 (struct target_ops *ops, ptid_t tpid);
static int darwin_thread_alive (struct target_ops *ops, ptid_t tpid);
static void darwin_encode_reply (mig_reply_error_t *reply,
mach_msg_header_t *hdr, integer_t code);
/* 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;
/* Port set, to wait for answer on all ports. */
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;
/* Inferior that should report a fake stop event. */
static struct inferior *darwin_inf_fake_stop;
#define PAGE_TRUNC(x) ((x) & ~(mach_page_size - 1))
#define PAGE_ROUND(x) PAGE_TRUNC((x) + mach_page_size - 1)
/* This controls output of inferior debugging. */
static unsigned int darwin_debug_flag = 0;
/* Create a __TEXT __info_plist section in the executable so that gdb could
be signed. This is required to get an authorization for task_for_pid.
Once gdb is built, you must codesign it with any system-trusted signing
authority. See taskgated(8) for details. */
static const unsigned char info_plist[]
__attribute__ ((section ("__TEXT,__info_plist"),used)) =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
"<!DOCTYPE plist PUBLIC \"-//Apple Computer//DTD PLIST 1.0//EN\""
" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">\n"
"<plist version=\"1.0\">\n"
"<dict>\n"
" <key>CFBundleIdentifier</key>\n"
" <string>org.gnu.gdb</string>\n"
" <key>CFBundleName</key>\n"
" <string>gdb</string>\n"
" <key>CFBundleVersion</key>\n"
" <string>1.0</string>\n"
" <key>SecTaskAccess</key>\n"
" <array>\n"
" <string>allowed</string>\n"
" <string>debug</string>\n"
" </array>\n"
"</dict>\n"
"</plist>\n";
static void inferior_debug (int level, const char *fmt, ...)
ATTRIBUTE_PRINTF (2, 3);
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]");
warning (_("Mach error at \"%s:%u\" in function \"%s\": %s (0x%lx)"),
file, line, 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;
}
}
/* Set errno to zero, and then call ptrace with the given arguments.
If inferior debugging traces are on, then also print a debug
trace.
The returned value is the same as the value returned by ptrace,
except in the case where that value is -1 but errno is zero.
This case is documented to be a non-error situation, so we
return zero in that case. */
static int
darwin_ptrace (const char *name,
int request, int pid, PTRACE_TYPE_ARG3 arg3, int arg4)
{
int ret;
errno = 0;
ret = ptrace (request, pid, (caddr_t) arg3, arg4);
if (ret == -1 && errno == 0)
ret = 0;
inferior_debug (4, _("ptrace (%s, %d, 0x%x, %d): %d (%s)\n"),
name, pid, arg3, arg4, ret,
(ret != 0) ? safe_strerror (errno) : _("no error"));
return ret;
}
static int
cmp_thread_t (const void *l, const void *r)
{
thread_t tl = *(const thread_t *)l;
thread_t tr = *(const thread_t *)r;
return (int)(tl - tr);
}
static void
darwin_check_new_threads (struct 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;
darwin_inferior *darwin_inf = inf->priv;
VEC (darwin_thread_t) *thread_vec;
/* Get list of threads. */
kret = task_threads (darwin_inf->task, &thread_list, &new_nbr);
MACH_CHECK_ERROR (kret);
if (kret != KERN_SUCCESS)
return;
/* Sort the list. */
if (new_nbr > 1)
qsort (thread_list, new_nbr, sizeof (thread_t), cmp_thread_t);
if (darwin_inf->threads)
old_nbr = VEC_length (darwin_thread_t, darwin_inf->threads);
else
old_nbr = 0;
/* Quick check for no changes. */
if (old_nbr == new_nbr)
{
for (i = 0; i < new_nbr; i++)
if (thread_list[i]
!= VEC_index (darwin_thread_t, darwin_inf->threads, i)->gdb_port)
break;
if (i == new_nbr)
{
/* Deallocate ports. */
for (i = 0; i < new_nbr; i++)
{
kret = mach_port_deallocate (mach_task_self (), thread_list[i]);
MACH_CHECK_ERROR (kret);
}
/* Deallocate the buffer. */
kret = vm_deallocate (gdb_task, (vm_address_t) thread_list,
new_nbr * sizeof (int));
MACH_CHECK_ERROR (kret);
return;
}
}
thread_vec = VEC_alloc (darwin_thread_t, new_nbr);
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;
darwin_thread_t *old = (old_ix < old_nbr) ?
VEC_index (darwin_thread_t, darwin_inf->threads, old_ix) : NULL;
thread_t old_id = old ? old->gdb_port : THREAD_NULL;
inferior_debug
(12, _(" new_ix:%d/%d, old_ix:%d/%d, new_id:0x%x old_id:0x%x\n"),
new_ix, new_nbr, old_ix, old_nbr, new_id, old_id);
if (old_id == new_id)
{
/* Thread still exist. */
VEC_safe_push (darwin_thread_t, thread_vec, old);
new_ix++;
old_ix++;
/* Deallocate the port. */
kret = mach_port_deallocate (gdb_task, new_id);
MACH_CHECK_ERROR (kret);
continue;
}
if (new_ix < new_nbr && new_id == MACH_PORT_DEAD)
{
/* Ignore dead ports.
In some weird cases, we might get dead ports. They should
correspond to dead thread so they could safely be ignored. */
new_ix++;
continue;
}
if (new_ix < new_nbr && (old_ix == old_nbr || new_id < old_id))
{
/* A thread was created. */
struct thread_info *tp;
struct private_thread_info *pti;
pti = XCNEW (struct private_thread_info);
pti->gdb_port = new_id;
pti->msg_state = DARWIN_RUNNING;
/* Add a new thread unless this is the first one ever met. */
if (!(old_nbr == 0 && new_ix == 0))
tp = add_thread_with_info (ptid_build (inf->pid, 0, new_id), pti);
else
{
tp = find_thread_ptid (ptid_build (inf->pid, 0, 0));
gdb_assert (tp);
tp->priv = pti;
}
VEC_safe_push (darwin_thread_t, thread_vec, pti);
new_ix++;
continue;
}
if (old_ix < old_nbr && (new_ix == new_nbr || new_id > old_id))
{
/* 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++;
continue;
}
gdb_assert_not_reached ("unexpected thread case");
}
if (darwin_inf->threads)
VEC_free (darwin_thread_t, darwin_inf->threads);
darwin_inf->threads = thread_vec;
/* Deallocate the buffer. */
kret = vm_deallocate (gdb_task, (vm_address_t) thread_list,
new_nbr * sizeof (int));
MACH_CHECK_ERROR (kret);
}
static int
find_inferior_task_it (struct inferior *inf, void *port_ptr)
{
return inf->priv->task == *(task_t*)port_ptr;
}
static int
find_inferior_notify_it (struct inferior *inf, void *port_ptr)
{
return inf->priv->notify_port == *(task_t*)port_ptr;
}
/* Return an inferior by task port. */
static struct inferior *
darwin_find_inferior_by_task (task_t port)
{
return iterate_over_inferiors (&find_inferior_task_it, &port);
}
/* Return an inferior by notification port. */
static struct inferior *
darwin_find_inferior_by_notify (mach_port_t port)
{
return iterate_over_inferiors (&find_inferior_notify_it, &port);
}
/* Return a thread by port. */
static darwin_thread_t *
darwin_find_thread (struct inferior *inf, thread_t thread)
{
darwin_thread_t *t;
int k;
for (k = 0;
VEC_iterate (darwin_thread_t, inf->priv->threads, k, t);
k++)
if (t->gdb_port == thread)
return t;
return NULL;
}
/* Suspend (ie stop) an inferior at Mach level. */
static void
darwin_suspend_inferior (struct inferior *inf)
{
if (!inf->priv->suspended)
{
kern_return_t kret;
kret = task_suspend (inf->priv->task);
MACH_CHECK_ERROR (kret);
inf->priv->suspended = 1;
}
}
/* Resume an inferior at Mach level. */
static void
darwin_resume_inferior (struct inferior *inf)
{
if (inf->priv->suspended)
{
kern_return_t kret;
kret = task_resume (inf->priv->task);
MACH_CHECK_ERROR (kret);
inf->priv->suspended = 0;
}
}
/* Iterator functions. */
static int
darwin_suspend_inferior_it (struct inferior *inf, void *arg)
{
darwin_suspend_inferior (inf);
darwin_check_new_threads (inf);
return 0;
}
static int
darwin_resume_inferior_it (struct inferior *inf, void *arg)
{
darwin_resume_inferior (inf);
return 0;
}
static void
darwin_dump_message (mach_msg_header_t *hdr, int disp_body)
{
printf_unfiltered (_("message header:\n"));
printf_unfiltered (_(" bits: 0x%x\n"), hdr->msgh_bits);
printf_unfiltered (_(" size: 0x%x\n"), hdr->msgh_size);
printf_unfiltered (_(" remote-port: 0x%x\n"), hdr->msgh_remote_port);
printf_unfiltered (_(" local-port: 0x%x\n"), hdr->msgh_local_port);
printf_unfiltered (_(" reserved: 0x%x\n"), hdr->msgh_reserved);
printf_unfiltered (_(" id: 0x%x\n"), hdr->msgh_id);
if (disp_body)
{
const unsigned char *data;
const unsigned int *ldata;
int size;
int i;
data = (unsigned char *)(hdr + 1);
size = hdr->msgh_size - sizeof (mach_msg_header_t);
if (hdr->msgh_bits & MACH_MSGH_BITS_COMPLEX)
{
mach_msg_body_t *bod = (mach_msg_body_t*)data;
mach_msg_port_descriptor_t *desc =
(mach_msg_port_descriptor_t *)(bod + 1);
int k;
NDR_record_t *ndr;
printf_unfiltered (_("body: descriptor_count=%u\n"),
bod->msgh_descriptor_count);
data += sizeof (mach_msg_body_t);
size -= sizeof (mach_msg_body_t);
for (k = 0; k < bod->msgh_descriptor_count; k++)
switch (desc[k].type)
{
case MACH_MSG_PORT_DESCRIPTOR:
printf_unfiltered
(_(" descr %d: type=%u (port) name=0x%x, dispo=%d\n"),
k, desc[k].type, desc[k].name, desc[k].disposition);
break;
default:
printf_unfiltered (_(" descr %d: type=%u\n"),
k, desc[k].type);
break;
}
data += bod->msgh_descriptor_count
* sizeof (mach_msg_port_descriptor_t);
size -= bod->msgh_descriptor_count
* sizeof (mach_msg_port_descriptor_t);
ndr = (NDR_record_t *)(desc + bod->msgh_descriptor_count);
printf_unfiltered
(_("NDR: mig=%02x if=%02x encod=%02x "
"int=%02x char=%02x float=%02x\n"),
ndr->mig_vers, ndr->if_vers, ndr->mig_encoding,
ndr->int_rep, ndr->char_rep, ndr->float_rep);
data += sizeof (NDR_record_t);
size -= sizeof (NDR_record_t);
}
printf_unfiltered (_(" data:"));
ldata = (const unsigned int *)data;
for (i = 0; i < size / sizeof (unsigned int); i++)
printf_unfiltered (" %08x", ldata[i]);
printf_unfiltered (_("\n"));
}
}
static int
darwin_decode_exception_message (mach_msg_header_t *hdr,
struct inferior **pinf,
darwin_thread_t **pthread)
{
mach_msg_body_t *bod = (mach_msg_body_t*)(hdr + 1);
mach_msg_port_descriptor_t *desc = (mach_msg_port_descriptor_t *)(bod + 1);
NDR_record_t *ndr;
integer_t *data;
struct inferior *inf;
darwin_thread_t *thread;
task_t task_port;
thread_t thread_port;
kern_return_t kret;
int i;
/* Check message destination. */
if (hdr->msgh_local_port != darwin_ex_port)
return -1;
/* Check message header. */
if (!(hdr->msgh_bits & MACH_MSGH_BITS_COMPLEX))
return -1;
/* Check descriptors. */
if (hdr->msgh_size < (sizeof (*hdr) + sizeof (*bod) + 2 * sizeof (*desc)
+ sizeof (*ndr) + 2 * sizeof (integer_t))
|| bod->msgh_descriptor_count != 2
|| desc[0].type != MACH_MSG_PORT_DESCRIPTOR
|| desc[0].disposition != MACH_MSG_TYPE_MOVE_SEND
|| desc[1].type != MACH_MSG_PORT_DESCRIPTOR
|| desc[1].disposition != MACH_MSG_TYPE_MOVE_SEND)
return -1;
/* Check data representation. */
ndr = (NDR_record_t *)(desc + 2);
if (ndr->mig_vers != NDR_PROTOCOL_2_0
|| ndr->if_vers != NDR_PROTOCOL_2_0
|| ndr->mig_encoding != NDR_record.mig_encoding
|| ndr->int_rep != NDR_record.int_rep
|| ndr->char_rep != NDR_record.char_rep
|| ndr->float_rep != NDR_record.float_rep)
return -1;
/* Ok, the hard work. */
data = (integer_t *)(ndr + 1);
task_port = desc[1].name;
thread_port = desc[0].name;
/* We got new rights to the task, get rid of it. Do not get rid of thread
right, as we will need it to find the thread. */
kret = mach_port_deallocate (mach_task_self (), task_port);
MACH_CHECK_ERROR (kret);
/* Find process by port. */
inf = darwin_find_inferior_by_task (task_port);
*pinf = inf;
if (inf == NULL)
{
/* Not a known inferior. This could happen if the child fork, as
the created process will inherit its exception port.
FIXME: should the exception port be restored ? */
kern_return_t kret;
mig_reply_error_t reply;
/* Free thread port (we don't know it). */
kret = mach_port_deallocate (mach_task_self (), thread_port);
MACH_CHECK_ERROR (kret);
darwin_encode_reply (&reply, hdr, KERN_SUCCESS);
kret = mach_msg (&reply.Head, MACH_SEND_MSG | MACH_SEND_INTERRUPT,
reply.Head.msgh_size, 0,
MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE,
MACH_PORT_NULL);
MACH_CHECK_ERROR (kret);
return 0;
}
/* Find thread by port. */
/* Check for new threads. Do it early so that the port in the exception
message can be deallocated. */
darwin_check_new_threads (inf);
/* Free the thread port (as gdb knows the thread, it has already has a right
for it, so this just decrement a reference counter). */
kret = mach_port_deallocate (mach_task_self (), thread_port);
MACH_CHECK_ERROR (kret);
thread = darwin_find_thread (inf, thread_port);
if (thread == NULL)
return -1;
*pthread = thread;
/* The thread should be running. However we have observed cases where a
thread got a SIGTTIN message after being stopped. */
gdb_assert (thread->msg_state != DARWIN_MESSAGE);
/* Finish decoding. */
thread->event.header = *hdr;
thread->event.thread_port = thread_port;
thread->event.task_port = task_port;
thread->event.ex_type = data[0];
thread->event.data_count = data[1];
if (hdr->msgh_size < (sizeof (*hdr) + sizeof (*bod) + 2 * sizeof (*desc)
+ sizeof (*ndr) + 2 * sizeof (integer_t)
+ data[1] * sizeof (integer_t)))
return -1;
for (i = 0; i < data[1]; i++)
thread->event.ex_data[i] = data[2 + i];
thread->msg_state = DARWIN_MESSAGE;
return 0;
}
static void
darwin_encode_reply (mig_reply_error_t *reply, mach_msg_header_t *hdr,
integer_t code)
{
mach_msg_header_t *rh = &reply->Head;
rh->msgh_bits = MACH_MSGH_BITS (MACH_MSGH_BITS_REMOTE (hdr->msgh_bits), 0);
rh->msgh_remote_port = hdr->msgh_remote_port;
rh->msgh_size = (mach_msg_size_t) sizeof (mig_reply_error_t);
rh->msgh_local_port = MACH_PORT_NULL;
rh->msgh_id = hdr->msgh_id + 100;
reply->NDR = NDR_record;
reply->RetCode = code;
}
static void
darwin_send_reply (struct inferior *inf, darwin_thread_t *thread)
{
kern_return_t kret;
mig_reply_error_t reply;
darwin_encode_reply (&reply, &thread->event.header, KERN_SUCCESS);
kret = mach_msg (&reply.Head, MACH_SEND_MSG | MACH_SEND_INTERRUPT,
reply.Head.msgh_size, 0,
MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE,
MACH_PORT_NULL);
MACH_CHECK_ERROR (kret);
inf->priv->pending_messages--;
}
static void
darwin_resume_thread (struct inferior *inf, darwin_thread_t *thread,
int step, int nsignal)
{
kern_return_t kret;
int res;
inferior_debug
(3, _("darwin_resume_thread: state=%d, thread=0x%x, step=%d nsignal=%d\n"),
thread->msg_state, thread->gdb_port, step, nsignal);
switch (thread->msg_state)
{
case DARWIN_MESSAGE:
if (thread->event.ex_type == EXC_SOFTWARE
&& thread->event.ex_data[0] == EXC_SOFT_SIGNAL)
{
/* Either deliver a new signal or cancel the signal received. */
res = PTRACE (PT_THUPDATE, inf->pid,
(void *)(uintptr_t)thread->gdb_port, nsignal);
if (res < 0)
inferior_debug (1, _("ptrace THUP: res=%d\n"), res);
}
else if (nsignal)
{
/* Note: ptrace is allowed only if the process is stopped.
Directly send the signal to the thread. */
res = syscall (SYS___pthread_kill, thread->gdb_port, nsignal);
inferior_debug (4, _("darwin_resume_thread: kill 0x%x %d: %d\n"),
thread->gdb_port, nsignal, res);
thread->signaled = 1;
}
/* Set or reset single step. */
if (step != thread->single_step)
{
inferior_debug (4, _("darwin_set_sstep (thread=0x%x, enable=%d)\n"),
thread->gdb_port, step);
darwin_set_sstep (thread->gdb_port, step);
thread->single_step = step;
}
darwin_send_reply (inf, thread);
thread->msg_state = DARWIN_RUNNING;
break;
case DARWIN_RUNNING:
break;
case DARWIN_STOPPED:
kret = thread_resume (thread->gdb_port);
MACH_CHECK_ERROR (kret);
thread->msg_state = DARWIN_RUNNING;
break;
}
}
/* Resume all threads of the inferior. */
static void
darwin_resume_inferior_threads (struct inferior *inf, int step, int nsignal)
{
darwin_thread_t *thread;
int k;
for (k = 0;
VEC_iterate (darwin_thread_t, inf->priv->threads, k, thread);
k++)
darwin_resume_thread (inf, thread, step, nsignal);
}
struct resume_inferior_threads_param
{
int step;
int nsignal;
};
static int
darwin_resume_inferior_threads_it (struct inferior *inf, void *param)
{
int step = ((struct resume_inferior_threads_param *)param)->step;
int nsignal = ((struct resume_inferior_threads_param *)param)->nsignal;
darwin_resume_inferior_threads (inf, step, nsignal);
return 0;
}
/* Suspend all threads of INF. */
static void
darwin_suspend_inferior_threads (struct inferior *inf)
{
darwin_thread_t *thread;
kern_return_t kret;
int k;
for (k = 0;
VEC_iterate (darwin_thread_t, inf->priv->threads, k, thread);
k++)
switch (thread->msg_state)
{
case DARWIN_STOPPED:
case DARWIN_MESSAGE:
break;
case DARWIN_RUNNING:
kret = thread_suspend (thread->gdb_port);
MACH_CHECK_ERROR (kret);
thread->msg_state = DARWIN_STOPPED;
break;
}
}
static void
darwin_resume (ptid_t ptid, int step, enum gdb_signal signal)
{
struct target_waitstatus status;
int pid;
kern_return_t kret;
int res;
int nsignal;
struct inferior *inf;
inferior_debug
(2, _("darwin_resume: pid=%d, tid=0x%x, step=%d, signal=%d\n"),
ptid_get_pid (ptid), ptid_get_tid (ptid), step, signal);
if (signal == GDB_SIGNAL_0)
nsignal = 0;
else
nsignal = gdb_signal_to_host (signal);
/* Don't try to single step all threads. */
if (step)
ptid = inferior_ptid;
/* minus_one_ptid is RESUME_ALL. */
if (ptid_equal (ptid, minus_one_ptid))
{
struct resume_inferior_threads_param param;
param.nsignal = nsignal;
param.step = step;
/* Resume threads. */
iterate_over_inferiors (darwin_resume_inferior_threads_it, ¶m);
/* Resume tasks. */
iterate_over_inferiors (darwin_resume_inferior_it, NULL);
}
else
{
struct inferior *inf = find_inferior_ptid (ptid);
long tid = ptid_get_tid (ptid);
/* Stop the inferior (should be useless). */
darwin_suspend_inferior (inf);
if (tid == 0)
darwin_resume_inferior_threads (inf, step, nsignal);
else
{
darwin_thread_t *thread;
/* Suspend threads of the task. */
darwin_suspend_inferior_threads (inf);
/* Resume the selected thread. */
thread = darwin_find_thread (inf, tid);
gdb_assert (thread);
darwin_resume_thread (inf, thread, step, nsignal);
}
/* Resume the task. */
darwin_resume_inferior (inf);
}
}
static void
darwin_resume_to (struct target_ops *ops, ptid_t ptid, int step,
enum gdb_signal signal)
{
return darwin_resume (ptid, step, signal);
}
static ptid_t
darwin_decode_message (mach_msg_header_t *hdr,
darwin_thread_t **pthread,
struct inferior **pinf,
struct target_waitstatus *status)
{
darwin_thread_t *thread;
struct inferior *inf;
/* Exception message. 2401 == 0x961 is exc. */
if (hdr->msgh_id == 2401)
{
int res;
/* Decode message. */
res = darwin_decode_exception_message (hdr, &inf, &thread);
if (res < 0)
{
/* Should not happen... */
printf_unfiltered
(_("darwin_wait: ill-formatted message (id=0x%x)\n"), hdr->msgh_id);
/* FIXME: send a failure reply? */
status->kind = TARGET_WAITKIND_IGNORE;
return minus_one_ptid;
}
if (inf == NULL)
{
status->kind = TARGET_WAITKIND_IGNORE;
return minus_one_ptid;
}
*pinf = inf;
*pthread = thread;
inf->priv->pending_messages++;
status->kind = TARGET_WAITKIND_STOPPED;
thread->msg_state = DARWIN_MESSAGE;
inferior_debug (4, _("darwin_wait: thread=0x%x, got %s\n"),
thread->gdb_port,
unparse_exception_type (thread->event.ex_type));
switch (thread->event.ex_type)
{
case EXC_BAD_ACCESS:
status->value.sig = GDB_EXC_BAD_ACCESS;
break;
case EXC_BAD_INSTRUCTION:
status->value.sig = GDB_EXC_BAD_INSTRUCTION;
break;
case EXC_ARITHMETIC:
status->value.sig = GDB_EXC_ARITHMETIC;
break;
case EXC_EMULATION:
status->value.sig = GDB_EXC_EMULATION;
break;
case EXC_SOFTWARE:
if (thread->event.ex_data[0] == EXC_SOFT_SIGNAL)
{
status->value.sig =
gdb_signal_from_host (thread->event.ex_data[1]);
inferior_debug (5, _(" (signal %d: %s)\n"),
thread->event.ex_data[1],
gdb_signal_to_name (status->value.sig));
/* If the thread is stopped because it has received a signal
that gdb has just sent, continue. */
if (thread->signaled)
{
thread->signaled = 0;
darwin_send_reply (inf, thread);
thread->msg_state = DARWIN_RUNNING;
status->kind = TARGET_WAITKIND_IGNORE;
}
}
else
status->value.sig = GDB_EXC_SOFTWARE;
break;
case EXC_BREAKPOINT:
/* Many internal GDB routines expect breakpoints to be reported
as GDB_SIGNAL_TRAP, and will report GDB_EXC_BREAKPOINT
as a spurious signal. */
status->value.sig = GDB_SIGNAL_TRAP;
break;
default:
status->value.sig = GDB_SIGNAL_UNKNOWN;
break;
}
return ptid_build (inf->pid, 0, thread->gdb_port);
}
else if (hdr->msgh_id == 0x48)
{
/* MACH_NOTIFY_DEAD_NAME: notification for exit. */
*pinf = NULL;
*pthread = NULL;
inf = darwin_find_inferior_by_notify (hdr->msgh_local_port);
if (inf != NULL)
{
if (!inf->priv->no_ptrace)
{
pid_t res;