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- /* Darwin support for GDB, the GNU debugger.
- Copyright (C) 2008-2022 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 "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 "gdbarch.h"
- #include <copyfile.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 "filenames.h"
- #include "gdbsupport/filestuff.h"
- #include "gdbsupport/gdb_unlinker.h"
- #include "gdbsupport/pathstuff.h"
- #include "gdbsupport/scoped_fd.h"
- #include "nat/fork-inferior.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_ptrace_me (void);
- static void darwin_encode_reply (mig_reply_error_t *reply,
- mach_msg_header_t *hdr, integer_t code);
- static void darwin_setup_request_notification (struct inferior *inf);
- static void darwin_deallocate_exception_ports (darwin_inferior *inf);
- static void darwin_setup_exceptions (struct inferior *inf);
- static void darwin_deallocate_threads (struct inferior *inf);
- /* 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 bool enable_mach_exceptions;
- /* Inferior that should report a fake stop event. */
- static struct inferior *darwin_inf_fake_stop;
- /* If non-NULL, the shell we actually invoke. See maybe_cache_shell
- for details. */
- static const char *copied_shell;
- #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);
- gdb_printf (gdb_stdlog, _("[%d inferior]: "), getpid ());
- gdb_vprintf (gdb_stdlog, 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, caddr_t arg3, int arg4)
- {
- int ret;
- errno = 0;
- ret = ptrace (request, pid, arg3, arg4);
- if (ret == -1 && errno == 0)
- ret = 0;
- inferior_debug (4, _("ptrace (%s, %d, 0x%lx, %d): %d (%s)\n"),
- name, pid, (unsigned long) 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);
- }
- void
- darwin_nat_target::check_new_threads (inferior *inf)
- {
- kern_return_t kret;
- thread_array_t thread_list;
- unsigned int new_nbr;
- unsigned int old_nbr;
- unsigned int new_ix, old_ix;
- darwin_inferior *darwin_inf = get_darwin_inferior (inf);
- std::vector<darwin_thread_t *> new_thread_vec;
- if (darwin_inf == nullptr)
- return;
- /* 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);
- old_nbr = darwin_inf->threads.size ();
- /* Quick check for no changes. */
- if (old_nbr == new_nbr)
- {
- size_t i;
- for (i = 0; i < new_nbr; i++)
- if (thread_list[i] != 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;
- }
- }
- /* Full handling: detect new threads, remove dead threads. */
- new_thread_vec.reserve (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) ? darwin_inf->threads[old_ix] : NULL;
- thread_t old_id = old != NULL ? 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. */
- new_thread_vec.push_back (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. */
- darwin_thread_info *pti = new darwin_thread_info;
- pti->gdb_port = new_id;
- pti->msg_state = DARWIN_RUNNING;
- /* Add the new thread. */
- add_thread_with_info (this, ptid_t (inf->pid, 0, new_id), pti);
- new_thread_vec.push_back (pti);
- new_ix++;
- continue;
- }
- if (old_ix < old_nbr && (new_ix == new_nbr || new_id > old_id))
- {
- /* A thread was removed. */
- struct thread_info *thr
- = find_thread_ptid (this, ptid_t (inf->pid, 0, old_id));
- delete_thread (thr);
- kret = mach_port_deallocate (gdb_task, old_id);
- MACH_CHECK_ERROR (kret);
- old_ix++;
- continue;
- }
- gdb_assert_not_reached ("unexpected thread case");
- }
- darwin_inf->threads = std::move (new_thread_vec);
- /* Deallocate the buffer. */
- kret = vm_deallocate (gdb_task, (vm_address_t) thread_list,
- new_nbr * sizeof (int));
- MACH_CHECK_ERROR (kret);
- }
- /* Return an inferior by task port. */
- static struct inferior *
- darwin_find_inferior_by_task (task_t port)
- {
- for (inferior *inf : all_inferiors ())
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- if (priv != nullptr && priv->task == port)
- return inf;
- }
- return nullptr;
- }
- /* Return an inferior by pid port. */
- static struct inferior *
- darwin_find_inferior_by_pid (int pid)
- {
- for (inferior *inf : all_inferiors ())
- {
- if (inf->pid == pid)
- return inf;
- }
- return nullptr;
- }
- /* Return a thread by port. */
- static darwin_thread_t *
- darwin_find_thread (struct inferior *inf, thread_t thread)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- if (priv != nullptr)
- for (darwin_thread_t *t : priv->threads)
- {
- 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)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- if (priv != nullptr && !priv->suspended)
- {
- kern_return_t kret;
- kret = task_suspend (priv->task);
- MACH_CHECK_ERROR (kret);
- priv->suspended = 1;
- }
- }
- /* Resume an inferior at Mach level. */
- static void
- darwin_resume_inferior (struct inferior *inf)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- if (priv != nullptr && priv->suspended)
- {
- kern_return_t kret;
- kret = task_resume (priv->task);
- MACH_CHECK_ERROR (kret);
- priv->suspended = 0;
- }
- }
- static void
- darwin_dump_message (mach_msg_header_t *hdr, int disp_body)
- {
- gdb_printf (gdb_stdlog,
- _("message header:\n"));
- gdb_printf (gdb_stdlog,
- _(" bits: 0x%x\n"), hdr->msgh_bits);
- gdb_printf (gdb_stdlog,
- _(" size: 0x%x\n"), hdr->msgh_size);
- gdb_printf (gdb_stdlog,
- _(" remote-port: 0x%x\n"), hdr->msgh_remote_port);
- gdb_printf (gdb_stdlog,
- _(" local-port: 0x%x\n"), hdr->msgh_local_port);
- gdb_printf (gdb_stdlog,
- _(" reserved: 0x%x\n"), hdr->msgh_reserved);
- gdb_printf (gdb_stdlog,
- _(" 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;
- gdb_printf (gdb_stdlog,
- _("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:
- gdb_printf
- (gdb_stdlog,
- _(" descr %d: type=%u (port) name=0x%x, dispo=%d\n"),
- k, desc[k].type, desc[k].name, desc[k].disposition);
- break;
- default:
- gdb_printf (gdb_stdlog,
- _(" 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);
- gdb_printf
- (gdb_stdlog,
- _("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);
- }
- gdb_printf (gdb_stdlog, _(" data:"));
- ldata = (const unsigned int *)data;
- for (i = 0; i < size / sizeof (unsigned int); i++)
- gdb_printf (gdb_stdlog, " %08x", ldata[i]);
- gdb_printf (gdb_stdlog, _("\n"));
- }
- }
- /* Adjust inferior data when a new task was created. */
- static struct inferior *
- darwin_find_new_inferior (task_t task_port, thread_t thread_port)
- {
- int task_pid;
- struct inferior *inf;
- kern_return_t kret;
- mach_port_t prev;
- /* Find the corresponding pid. */
- kret = pid_for_task (task_port, &task_pid);
- if (kret != KERN_SUCCESS)
- {
- MACH_CHECK_ERROR (kret);
- return NULL;
- }
- /* Find the inferior for this pid. */
- inf = darwin_find_inferior_by_pid (task_pid);
- if (inf == NULL)
- return NULL;
- darwin_inferior *priv = get_darwin_inferior (inf);
- /* Deallocate saved exception ports. */
- darwin_deallocate_exception_ports (priv);
- /* No need to remove dead_name notification, but still... */
- kret = mach_port_request_notification (gdb_task, priv->task,
- MACH_NOTIFY_DEAD_NAME, 0,
- MACH_PORT_NULL,
- MACH_MSG_TYPE_MAKE_SEND_ONCE,
- &prev);
- if (kret != KERN_INVALID_ARGUMENT)
- MACH_CHECK_ERROR (kret);
- /* Replace old task port. */
- kret = mach_port_deallocate (gdb_task, priv->task);
- MACH_CHECK_ERROR (kret);
- priv->task = task_port;
- darwin_setup_request_notification (inf);
- darwin_setup_exceptions (inf);
- return inf;
- }
- /* Check data representation. */
- static int
- darwin_check_message_ndr (NDR_record_t *ndr)
- {
- 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;
- return 0;
- }
- /* Decode an exception message. */
- int
- darwin_nat_target::decode_exception_message (mach_msg_header_t *hdr,
- 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 (darwin_check_message_ndr (ndr) != 0)
- return -1;
- /* Ok, the hard work. */
- data = (integer_t *)(ndr + 1);
- task_port = desc[1].name;
- thread_port = desc[0].name;
- /* Find process by port. */
- inf = darwin_find_inferior_by_task (task_port);
- *pinf = inf;
- if (inf == NULL && data[0] == EXC_SOFTWARE && data[1] == 2
- && data[2] == EXC_SOFT_SIGNAL && data[3] == SIGTRAP)
- {
- /* Not a known inferior, but a sigtrap. This happens on darwin 16.1.0,
- as a new Mach task is created when a process exec. */
- inf = darwin_find_new_inferior (task_port, thread_port);
- *pinf = inf;
- if (inf == NULL)
- {
- /* Deallocate task_port, unless it was saved. */
- kret = mach_port_deallocate (mach_task_self (), task_port);
- MACH_CHECK_ERROR (kret);
- }
- }
- else
- {
- /* 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);
- }
- 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 ? */
- mig_reply_error_t reply;
- inferior_debug
- (4, _("darwin_decode_exception_message: unknown task 0x%x\n"),
- task_port);
- /* 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. */
- 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;
- }
- /* Decode dead_name notify message. */
- static int
- darwin_decode_notify_message (mach_msg_header_t *hdr, struct inferior **pinf)
- {
- NDR_record_t *ndr = (NDR_record_t *)(hdr + 1);
- integer_t *data = (integer_t *)(ndr + 1);
- struct inferior *inf;
- task_t task_port;
- /* Check message header. */
- if (hdr->msgh_bits & MACH_MSGH_BITS_COMPLEX)
- return -1;
- /* Check descriptors. */
- if (hdr->msgh_size < (sizeof (*hdr) + sizeof (*ndr) + sizeof (integer_t)))
- return -2;
- /* Check data representation. */
- if (darwin_check_message_ndr (ndr) != 0)
- return -3;
- task_port = data[0];
- /* Find process by port. */
- inf = darwin_find_inferior_by_task (task_port);
- *pinf = inf;
- /* Check message destination. */
- if (inf != NULL)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- if (hdr->msgh_local_port != priv->notify_port)
- return -4;
- }
- 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_inferior *priv = get_darwin_inferior (inf);
- 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);
- priv->pending_messages--;
- }
- /* Wrapper around the __pthread_kill syscall. We use this instead of the
- pthread_kill function to be able to send a signal to any kind of thread,
- including GCD threads. */
- static int
- darwin_pthread_kill (darwin_thread_t *thread, int nsignal)
- {
- DIAGNOSTIC_PUSH;
- DIAGNOSTIC_IGNORE_DEPRECATED_DECLARATIONS;
- int res = syscall (SYS___pthread_kill, thread->gdb_port, nsignal);
- DIAGNOSTIC_POP;
- return res;
- }
- static void
- darwin_resume_thread (struct inferior *inf, darwin_thread_t *thread,
- int step, int nsignal)
- {
- 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. */
- int res = PTRACE (PT_THUPDATE, inf->pid,
- (caddr_t) (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. */
- int res = darwin_pthread_kill (thread, 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. */
- 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:
- kern_return_t 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_inferior *priv = get_darwin_inferior (inf);
- if (priv != nullptr)
- for (darwin_thread_t *thread : priv->threads)
- darwin_resume_thread (inf, thread, step, nsignal);
- }
- /* Suspend all threads of INF. */
- static void
- darwin_suspend_inferior_threads (struct inferior *inf)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- for (darwin_thread_t *thread : priv->threads)
- {
- switch (thread->msg_state)
- {
- case DARWIN_STOPPED:
- case DARWIN_MESSAGE:
- break;
- case DARWIN_RUNNING:
- {
- kern_return_t kret = thread_suspend (thread->gdb_port);
- MACH_CHECK_ERROR (kret);
- thread->msg_state = DARWIN_STOPPED;
- break;
- }
- }
- }
- }
- void
- darwin_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
- {
- int nsignal;
- inferior_debug
- (2, _("darwin_resume: ptid=%s, step=%d, signal=%d\n"),
- ptid.to_string ().c_str (), 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 == minus_one_ptid)
- {
- /* Resume threads. */
- for (inferior *inf : all_inferiors ())
- darwin_resume_inferior_threads (inf, step, nsignal);
- /* Resume tasks. */
- for (inferior *inf : all_inferiors ())
- darwin_resume_inferior (inf);
- }
- else
- {
- inferior *inf = find_inferior_ptid (this, ptid);
- long tid = ptid.tid ();
- /* 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);
- }
- }
- ptid_t
- darwin_nat_target::decode_message (mach_msg_header_t *hdr,
- darwin_thread_t **pthread,
- inferior **pinf,
- 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 = decode_exception_message (hdr, &inf, &thread);
- if (res < 0)
- {
- /* Should not happen... */
- warning (_("darwin_wait: ill-formatted message (id=0x%x)\n"),
- hdr->msgh_id);
- /* FIXME: send a failure reply? */
- status->set_ignore ();
- return minus_one_ptid;
- }
- if (inf == NULL)
- {
- status->set_ignore ();
- return minus_one_ptid;
- }
- *pinf = inf;
- *pthread = thread;
- darwin_inferior *priv = get_darwin_inferior (inf);
- priv->pending_messages++;
- 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->set_stopped (GDB_EXC_BAD_ACCESS);
- break;
- case EXC_BAD_INSTRUCTION:
- status->set_stopped (GDB_EXC_BAD_INSTRUCTION);
- break;
- case EXC_ARITHMETIC:
- status->set_stopped (GDB_EXC_ARITHMETIC);
- break;
- case EXC_EMULATION:
- status->set_stopped (GDB_EXC_EMULATION);
- break;
- case EXC_SOFTWARE:
- if (thread->event.ex_data[0] == EXC_SOFT_SIGNAL)
- {
- status->set_stopped
- (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->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->set_ignore ();
- }
- }
- else
- status->set_stopped (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->set_stopped (GDB_SIGNAL_TRAP);
- break;
- default:
- status->set_stopped (GDB_SIGNAL_UNKNOWN);
- break;
- }
- return ptid_t (inf->pid, 0, thread->gdb_port);
- }
- else if (hdr->msgh_id == 0x48)
- {
- /* MACH_NOTIFY_DEAD_NAME: notification for exit *or* WIFSTOPPED. */
- int res;
- res = darwin_decode_notify_message (hdr, &inf);
- if (res < 0)
- {
- /* Should not happen... */
- warning
- (_("darwin_wait: ill-formatted message (id=0x%x, res=%d)\n"),
- hdr->msgh_id, res);
- }
- *pinf = NULL;
- *pthread = NULL;
- if (res < 0 || inf == NULL)
- {
- status->set_ignore ();
- return minus_one_ptid;
- }
- if (inf != NULL)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- if (!priv->no_ptrace)
- {
- pid_t res_pid;
- int wstatus;
- res_pid = wait4 (inf->pid, &wstatus, 0, NULL);
- if (res_pid < 0 || res_pid != inf->pid)
- {
- warning (_("wait4: res=%d: %s\n"),
- res_pid, safe_strerror (errno));
- status->set_ignore ();
- return minus_one_ptid;
- }
- if (WIFEXITED (wstatus))
- {
- status->set_exited (WEXITSTATUS (wstatus));
- inferior_debug (4, _("darwin_wait: pid=%d exit, status=0x%x\n"),
- res_pid, wstatus);
- }
- else if (WIFSTOPPED (wstatus))
- {
- /* Ignore stopped state, it will be handled by the next
- exception. */
- status->set_ignore ();
- inferior_debug (4, _("darwin_wait: pid %d received WIFSTOPPED\n"),
- res_pid);
- return minus_one_ptid;
- }
- else if (WIFSIGNALED (wstatus))
- {
- status->set_signalled
- (gdb_signal_from_host (WTERMSIG (wstatus)));
- inferior_debug (4, _("darwin_wait: pid=%d received signal %d\n"),
- res_pid, status->sig());
- }
- else
- {
- status->set_ignore ();
- warning (_("Unexpected wait status after MACH_NOTIFY_DEAD_NAME "
- "notification: 0x%x"), wstatus);
- return minus_one_ptid;
- }
- return ptid_t (inf->pid);
- }
- else
- {
- inferior_debug (4, _("darwin_wait: pid=%d\n"), inf->pid);
- status->set_exited (0 /* Don't know. */);
- return ptid_t (inf->pid, 0, 0);
- }
- }
- }
- /* Unknown message. */
- warning (_("darwin: got unknown message, id: 0x%x"), hdr->msgh_id);
- status->set_ignore ();
- return minus_one_ptid;
- }
- int
- darwin_nat_target::cancel_breakpoint (ptid_t ptid)
- {
- /* Arrange for a breakpoint to be hit again later. We will handle
- the current event, eventually we will resume this thread, and this
- breakpoint will trap again.
- If we do not do this, then we run the risk that the user will
- delete or disable the breakpoint, but the thread will have already
- tripped on it. */
- struct regcache *regcache = get_thread_regcache (this, ptid);
- struct gdbarch *gdbarch = regcache->arch ();
- CORE_ADDR pc;
- pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch);
- if (breakpoint_inserted_here_p (regcache->aspace (), pc))
- {
- inferior_debug (4, "cancel_breakpoint for thread 0x%lx\n",
- (unsigned long) ptid.tid ());
- /* Back up the PC if necessary. */
- if (gdbarch_decr_pc_after_break (gdbarch))
- regcache_write_pc (regcache, pc);
- return 1;
- }
- return 0;
- }
- ptid_t
- darwin_nat_target::wait_1 (ptid_t ptid, struct target_waitstatus *status)
- {
- kern_return_t kret;
- union
- {
- mach_msg_header_t hdr;
- char data[0x100];
- } msgin;
- mach_msg_header_t *hdr = &msgin.hdr;
- ptid_t res;
- darwin_thread_t *thread;
- inferior_debug
- (2, _("darwin_wait: waiting for a message ptid=%s\n"),
- ptid.to_string ().c_str ());
- /* Handle fake stop events at first. */
- if (darwin_inf_fake_stop != NULL)
- {
- inferior *inf = darwin_inf_fake_stop;
- darwin_inf_fake_stop = NULL;
- darwin_inferior *priv = get_darwin_inferior (inf);
- status->set_stopped (GDB_SIGNAL_TRAP);
- thread = priv->threads[0];
- thread->msg_state = DARWIN_STOPPED;
- return ptid_t (inf->pid, 0, thread->gdb_port);
- }
- do
- {
- /* set_sigint_trap (); */
- /* 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);
- /* clear_sigint_trap (); */
- if (kret == MACH_RCV_INTERRUPTED)
- {
- status->set_ignore ();
- return minus_one_ptid;
- }
- if (kret != MACH_MSG_SUCCESS)
- {
- inferior_debug (5, _("mach_msg: ret=0x%x\n"), kret);
- status->set_spurious ();
- return minus_one_ptid;
- }
- /* Debug: display message. */
- if (darwin_debug_flag > 10)
- darwin_dump_message (hdr, darwin_debug_flag > 11);
- inferior *inf;
- res = decode_message (hdr, &thread, &inf, status);
- if (res == minus_one_ptid)
- continue;
- /* Early return in case an inferior has exited. */
- if (inf == NULL)
- return res;
- }
- while (status->kind () == TARGET_WAITKIND_IGNORE);
- /* Stop all tasks. */
- for (inferior *inf : all_inferiors (this))
- {
- darwin_suspend_inferior (inf);
- check_new_threads (inf);
- }
- /* Read pending messages. */
- while (1)
- {
- struct target_waitstatus status2;
- ptid_t ptid2;
- kret = mach_msg (&msgin.hdr,
- MACH_RCV_MSG | MACH_RCV_TIMEOUT, 0,
- sizeof (msgin.data), darwin_port_set, 1, MACH_PORT_NULL);
- if (kret == MACH_RCV_TIMED_OUT)
- break;
- if (kret != MACH_MSG_SUCCESS)
- {
- inferior_debug
- (5, _("darwin_wait: mach_msg(pending) ret=0x%x\n"), kret);
- break;
- }
- /* Debug: display message. */
- if (darwin_debug_flag > 10)
- darwin_dump_message (hdr, darwin_debug_flag > 11);
- inferior *inf;
- ptid2 = decode_message (hdr, &thread, &inf, &status2);
- if (inf != NULL && thread != NULL
- && thread->event.ex_type == EXC_BREAKPOINT)
- {
- if (thread->single_step
- || cancel_breakpoint (ptid_t (inf->pid, 0, thread->gdb_port)))
- {
- gdb_assert (thread->msg_state == DARWIN_MESSAGE);
- darwin_send_reply (inf, thread);
- thread->msg_state = DARWIN_RUNNING;
- }
- else
- inferior_debug
- (3, _("darwin_wait: thread 0x%x hit a non-gdb breakpoint\n"),
- thread->gdb_port);
- }
- else
- inferior_debug (3, _("darwin_wait: unhandled pending message\n"));
- }
- return res;
- }
- ptid_t
- darwin_nat_target::wait (ptid_t ptid, struct target_waitstatus *status,
- target_wait_flags options)
- {
- return wait_1 (ptid, status);
- }
- void
- darwin_nat_target::interrupt ()
- {
- struct inferior *inf = current_inferior ();
- darwin_inferior *priv = get_darwin_inferior (inf);
- /* FIXME: handle in no_ptrace mode. */
- gdb_assert (!priv->no_ptrace);
- ::kill (inf->pid, SIGINT);
- }
- /* Deallocate threads port and vector. */
- static void
- darwin_deallocate_threads (struct inferior *inf)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- for (darwin_thread_t *t : priv->threads)
- {
- kern_return_t kret = mach_port_deallocate (gdb_task, t->gdb_port);
- MACH_CHECK_ERROR (kret);
- }
- priv->threads.clear ();
- }
- void
- darwin_nat_target::mourn_inferior ()
- {
- struct inferior *inf = current_inferior ();
- darwin_inferior *priv = get_darwin_inferior (inf);
- kern_return_t kret;
- mach_port_t prev;
- /* Deallocate threads. */
- darwin_deallocate_threads (inf);
- /* Remove notify_port from darwin_port_set. */
- kret = mach_port_move_member (gdb_task,
- priv->notify_port, MACH_PORT_NULL);
- MACH_CHECK_ERROR (kret);
- /* Remove task port dead_name notification. */
- kret = mach_port_request_notification (gdb_task, priv->task,
- MACH_NOTIFY_DEAD_NAME, 0,
- MACH_PORT_NULL,
- MACH_MSG_TYPE_MAKE_SEND_ONCE,
- &prev);
- /* This can fail if the task is dead. */
- inferior_debug (4, "task=0x%x, prev=0x%x, notify_port=0x%x\n",
- priv->task, prev, priv->notify_port);
- if (kret == KERN_SUCCESS)
- {
- kret = mach_port_deallocate (gdb_task, prev);
- MACH_CHECK_ERROR (kret);
- }
- /* Destroy notify_port. */
- kret = mach_port_destroy (gdb_task, priv->notify_port);
- MACH_CHECK_ERROR (kret);
- /* Deallocate saved exception ports. */
- darwin_deallocate_exception_ports (priv);
- /* Deallocate task port. */
- kret = mach_port_deallocate (gdb_task, priv->task);
- MACH_CHECK_ERROR (kret);
- inf->priv = NULL;
- inf_child_target::mourn_inferior ();
- }
- static void
- darwin_reply_to_all_pending_messages (struct inferior *inf)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- for (darwin_thread_t *t : priv->threads)
- {
- if (t->msg_state == DARWIN_MESSAGE)
- darwin_resume_thread (inf, t, 0, 0);
- }
- }
- void
- darwin_nat_target::stop_inferior (inferior *inf)
- {
- struct target_waitstatus wstatus;
- ptid_t ptid;
- int res;
- darwin_inferior *priv = get_darwin_inferior (inf);
- gdb_assert (inf != NULL);
- darwin_suspend_inferior (inf);
- darwin_reply_to_all_pending_messages (inf);
- if (priv->no_ptrace)
- return;
- res = ::kill (inf->pid, SIGSTOP);
- if (res != 0)
- warning (_("cannot kill: %s"), safe_strerror (errno));
- /* Wait until the process is really stopped. */
- while (1)
- {
- ptid = wait_1 (ptid_t (inf->pid), &wstatus);
- if (wstatus.kind () == TARGET_WAITKIND_STOPPED
- && wstatus.sig () == GDB_SIGNAL_STOP)
- break;
- }
- }
- 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;
- }
- /* Deallocate saved exception ports. */
- static void
- darwin_deallocate_exception_ports (darwin_inferior *inf)
- {
- int i;
- kern_return_t kret;
- for (i = 0; i < inf->exception_info.count; i++)
- {
- kret = mach_port_deallocate (gdb_task, inf->exception_info.ports[i]);
- MACH_CHECK_ERROR (kret);
- }
- inf->exception_info.count = 0;
- }
- static void
- darwin_setup_exceptions (struct inferior *inf)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- kern_return_t kret;
- exception_mask_t mask;
- kret = darwin_save_exception_ports (priv);
- if (kret != KERN_SUCCESS)
- error (_("Unable to save exception ports, task_get_exception_ports"
- "returned: %d"),
- kret);
- /* Set exception port. */
- if (enable_mach_exceptions)
- mask = EXC_MASK_ALL;
- else
- mask = EXC_MASK_SOFTWARE | EXC_MASK_BREAKPOINT;
- kret = task_set_exception_ports (priv->task, mask, darwin_ex_port,
- EXCEPTION_DEFAULT, THREAD_STATE_NONE);
- if (kret != KERN_SUCCESS)
- error (_("Unable to set exception ports, task_set_exception_ports"
- "returned: %d"),
- kret);
- }
- void
- darwin_nat_target::kill ()
- {
- struct inferior *inf = current_inferior ();
- darwin_inferior *priv = get_darwin_inferior (inf);
- struct target_waitstatus wstatus;
- ptid_t ptid;
- kern_return_t kret;
- int res;
- if (inferior_ptid == null_ptid)
- return;
- gdb_assert (inf != NULL);
- kret = darwin_restore_exception_ports (priv);
- MACH_CHECK_ERROR (kret);
- darwin_reply_to_all_pending_messages (inf);
- res = ::kill (inf->pid, 9);
- if (res == 0)
- {
- /* On MacOS version Sierra, the darwin_restore_exception_ports call
- does not work as expected.
- When the kill function is called, the SIGKILL signal is received
- by gdb whereas it should have been received by the kernel since
- the exception ports have been restored.
- This behavior is not the expected one thus gdb does not reply to
- the received SIGKILL message. This situation leads to a "busy"
- resource from the kernel point of view and the inferior is never
- released, causing it to remain as a zombie process, even after
- GDB exits.
- To work around this, we mark all the threads of the inferior as
- signaled thus darwin_decode_message function knows that the kill
- signal was sent by gdb and will take the appropriate action
- (cancel signal and reply to the signal message). */
- for (darwin_thread_t *thread : priv->threads)
- thread->signaled = 1;
- darwin_resume_inferior (inf);
- ptid = wait_1 (ptid_t (inf->pid), &wstatus);
- }
- else if (errno != ESRCH)
- warning (_("Failed to kill inferior: kill (%d, 9) returned [%s]"),
- inf->pid, safe_strerror (errno));
- target_mourn_inferior (ptid_t (inf->pid));
- }
- static void
- darwin_setup_request_notification (struct inferior *inf)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- kern_return_t kret;
- mach_port_t prev_not;
- kret = mach_port_request_notification (gdb_task, priv->task,
- MACH_NOTIFY_DEAD_NAME, 0,
- priv->notify_port,
- MACH_MSG_TYPE_MAKE_SEND_ONCE,
- &prev_not);
- if (kret != KERN_SUCCESS)
- error (_("Termination notification request failed, "
- "mach_port_request_notification\n"
- "returned: %d"),
- kret);
- if (prev_not != MACH_PORT_NULL)
- {
- /* This is unexpected, as there should not be any previously
- registered notification request. But this is not a fatal
- issue, so just emit a warning. */
- warning (_("\
- A task termination request was registered before the debugger registered\n\
- its own. This is unexpected, but should otherwise not have any actual\n\
- impact on the debugging session."));
- }
- }
- static void
- darwin_attach_pid (struct inferior *inf)
- {
- kern_return_t kret;
- darwin_inferior *priv = new darwin_inferior;
- inf->priv.reset (priv);
- try
- {
- kret = task_for_pid (gdb_task, inf->pid, &priv->task);
- if (kret != KERN_SUCCESS)
- {
- int status;
- if (!inf->attach_flag)
- {
- kill (inf->pid, 9);
- waitpid (inf->pid, &status, 0);
- }
- error
- (_("Unable to find Mach task port for process-id %d: %s (0x%lx).\n"
- " (please check gdb is codesigned - see taskgated(8))"),
- inf->pid, mach_error_string (kret), (unsigned long) kret);
- }
- inferior_debug (2, _("inferior task: 0x%x, pid: %d\n"),
- priv->task, inf->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);
- if (kret != KERN_SUCCESS)
- error (_("Unable to create exception port, mach_port_allocate "
- "returned: %d"),
- kret);
- kret = mach_port_insert_right (gdb_task, darwin_ex_port,
- darwin_ex_port,
- MACH_MSG_TYPE_MAKE_SEND);
- if (kret != KERN_SUCCESS)
- error (_("Unable to create exception port, mach_port_insert_right "
- "returned: %d"),
- kret);
- /* Create a port set and put ex_port in it. */
- kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_PORT_SET,
- &darwin_port_set);
- if (kret != KERN_SUCCESS)
- error (_("Unable to create port set, mach_port_allocate "
- "returned: %d"),
- kret);
- kret = mach_port_move_member (gdb_task, darwin_ex_port,
- darwin_port_set);
- if (kret != KERN_SUCCESS)
- error (_("Unable to move exception port into new port set, "
- "mach_port_move_member\n"
- "returned: %d"),
- kret);
- }
- /* Create a port to be notified when the child task terminates. */
- kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_RECEIVE,
- &priv->notify_port);
- if (kret != KERN_SUCCESS)
- error (_("Unable to create notification port, mach_port_allocate "
- "returned: %d"),
- kret);
- kret = mach_port_move_member (gdb_task,
- priv->notify_port, darwin_port_set);
- if (kret != KERN_SUCCESS)
- error (_("Unable to move notification port into new port set, "
- "mach_port_move_member\n"
- "returned: %d"),
- kret);
- darwin_setup_request_notification (inf);
- darwin_setup_exceptions (inf);
- }
- catch (const gdb_exception &ex)
- {
- exit_inferior (inf);
- switch_to_no_thread ();
- throw;
- }
- target_ops *darwin_ops = get_native_target ();
- if (!inf->target_is_pushed (darwin_ops))
- inf->push_target (darwin_ops);
- }
- /* Get the thread_info object corresponding to this darwin_thread_info. */
- static struct thread_info *
- thread_info_from_private_thread_info (darwin_thread_info *pti)
- {
- for (struct thread_info *it : all_threads ())
- {
- darwin_thread_info *iter_pti = get_darwin_thread_info (it);
- if (iter_pti->gdb_port == pti->gdb_port)
- return it;
- }
- gdb_assert_not_reached ("did not find gdb thread for darwin thread");
- }
- void
- darwin_nat_target::init_thread_list (inferior *inf)
- {
- check_new_threads (inf);
- darwin_inferior *priv = get_darwin_inferior (inf);
- gdb_assert (!priv->threads.empty ());
- darwin_thread_info *first_pti = priv->threads.front ();
- struct thread_info *first_thread
- = thread_info_from_private_thread_info (first_pti);
- switch_to_thread (first_thread);
- }
- /* 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. */
- if (close (ptrace_fds[1]) < 0)
- trace_start_error_with_name ("close");
- /* Wait until gdb is ready. */
- res = read (ptrace_fds[0], &c, 1);
- if (res != 0)
- trace_start_error (_("unable to read from pipe, read returned: %d"), res);
- if (close (ptrace_fds[0]) < 0)
- trace_start_error_with_name ("close");
- /* Get rid of privileges. */
- if (setegid (getgid ()) < 0)
- trace_start_error_with_name ("setegid");
- /* Set TRACEME. */
- if (PTRACE (PT_TRACE_ME, 0, 0, 0) < 0)
- trace_start_error_with_name ("PTRACE");
- /* Redirect signals to exception port. */
- if (PTRACE (PT_SIGEXC, 0, 0, 0) < 0)
- trace_start_error_with_name ("PTRACE");
- }
- /* 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));
- }
- mark_fd_no_cloexec (ptrace_fds[0]);
- mark_fd_no_cloexec (ptrace_fds[1]);
- }
- void
- darwin_nat_target::ptrace_him (int pid)
- {
- struct inferior *inf = current_inferior ();
- darwin_attach_pid (inf);
- /* Let's the child run. */
- ::close (ptrace_fds[0]);
- ::close (ptrace_fds[1]);
- unmark_fd_no_cloexec (ptrace_fds[0]);
- unmark_fd_no_cloexec (ptrace_fds[1]);
- init_thread_list (inf);
- gdb_startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED);
- }
- static void
- darwin_execvp (const char *file, char * const argv[], char * const env[])
- {
- posix_spawnattr_t attr;
- short ps_flags = 0;
- int res;
- res = posix_spawnattr_init (&attr);
- if (res != 0)
- {
- gdb_printf
- (gdb_stderr, "Cannot initialize attribute for posix_spawn\n");
- return;
- }
- /* Do like execve: replace the image. */
- ps_flags = POSIX_SPAWN_SETEXEC;
- /* Disable ASLR. The constant doesn't look to be available outside the
- kernel include files. */
- #ifndef _POSIX_SPAWN_DISABLE_ASLR
- #define _POSIX_SPAWN_DISABLE_ASLR 0x0100
- #endif
- ps_flags |= _POSIX_SPAWN_DISABLE_ASLR;
- res = posix_spawnattr_setflags (&attr, ps_flags);
- if (res != 0)
- {
- gdb_printf (gdb_stderr, "Cannot set posix_spawn flags\n");
- return;
- }
- posix_spawnp (NULL, argv[0], NULL, &attr, argv, env);
- }
- /* Read kernel version, and return TRUE if this host may have System
- Integrity Protection (Sierra or later). */
- static bool
- may_have_sip ()
- {
- char str[16];
- size_t sz = sizeof (str);
- int ret;
- ret = sysctlbyname ("kern.osrelease", str, &sz, NULL, 0);
- if (ret == 0 && sz < sizeof (str))
- {
- unsigned long ver = strtoul (str, NULL, 10);
- if (ver >= 16)
- return true;
- }
- return false;
- }
- /* A helper for maybe_cache_shell. This copies the shell to the
- cache. It will throw an exception on any failure. */
- static void
- copy_shell_to_cache (const char *shell, const std::string &new_name)
- {
- scoped_fd from_fd = gdb_open_cloexec (shell, O_RDONLY, 0);
- if (from_fd.get () < 0)
- error (_("Could not open shell (%s) for reading: %s"),
- shell, safe_strerror (errno));
- std::string new_dir = ldirname (new_name.c_str ());
- if (!mkdir_recursive (new_dir.c_str ()))
- error (_("Could not make cache directory \"%s\": %s"),
- new_dir.c_str (), safe_strerror (errno));
- gdb::char_vector temp_name = make_temp_filename (new_name);
- scoped_fd to_fd = gdb_mkostemp_cloexec (&temp_name[0]);
- gdb::unlinker unlink_file_on_error (temp_name.data ());
- if (to_fd.get () < 0)
- error (_("Could not open temporary file \"%s\" for writing: %s"),
- temp_name.data (), safe_strerror (errno));
- if (fcopyfile (from_fd.get (), to_fd.get (), nullptr,
- COPYFILE_STAT | COPYFILE_DATA) != 0)
- error (_("Could not copy shell to cache as \"%s\": %s"),
- temp_name.data (), safe_strerror (errno));
- /* Be sure that the caching is atomic so that we don't get bad
- results from multiple copies of gdb running at the same time. */
- if (rename (temp_name.data (), new_name.c_str ()) != 0)
- error (_("Could not rename shell cache file to \"%s\": %s"),
- new_name.c_str (), safe_strerror (errno));
- unlink_file_on_error.keep ();
- }
- /* If $SHELL is restricted, try to cache a copy. Starting with El
- Capitan, macOS introduced System Integrity Protection. Among other
- things, this prevents certain executables from being ptrace'd. In
- particular, executables in /bin, like most shells, are affected.
- To work around this, while preserving command-line glob expansion
- and redirections, gdb will cache a copy of the shell. Return true
- if all is well -- either the shell is not subject to SIP or it has
- been successfully cached. Returns false if something failed. */
- static bool
- maybe_cache_shell ()
- {
- /* SF_RESTRICTED is defined in sys/stat.h and lets us determine if a
- given file is subject to SIP. */
- #ifdef SF_RESTRICTED
- /* If a check fails we want to revert -- maybe the user deleted the
- cache while gdb was running, or something like that. */
- copied_shell = nullptr;
- const char *shell = get_shell ();
- if (!IS_ABSOLUTE_PATH (shell))
- {
- warning (_("This version of macOS has System Integrity Protection.\n\
- Normally gdb would try to work around this by caching a copy of your shell,\n\
- but because your shell (%s) is not an absolute path, this is being skipped."),
- shell);
- return false;
- }
- struct stat sb;
- if (stat (shell, &sb) < 0)
- {
- warning (_("This version of macOS has System Integrity Protection.\n\
- Normally gdb would try to work around this by caching a copy of your shell,\n\
- but because gdb could not stat your shell (%s), this is being skipped.\n\
- The error was: %s"),
- shell, safe_strerror (errno));
- return false;
- }
- if ((sb.st_flags & SF_RESTRICTED) == 0)
- return true;
- /* Put the copy somewhere like ~/Library/Caches/gdb/bin/sh. */
- std::string new_name = get_standard_cache_dir ();
- /* There's no need to insert a directory separator here, because
- SHELL is known to be absolute. */
- new_name.append (shell);
- /* Maybe it was cached by some earlier gdb. */
- if (stat (new_name.c_str (), &sb) != 0 || !S_ISREG (sb.st_mode))
- {
- try
- {
- copy_shell_to_cache (shell, new_name);
- }
- catch (const gdb_exception_error &ex)
- {
- warning (_("This version of macOS has System Integrity Protection.\n\
- Because `startup-with-shell' is enabled, gdb tried to work around SIP by\n\
- caching a copy of your shell. However, this failed:\n\
- %s\n\
- If you correct the problem, gdb will automatically try again the next time\n\
- you \"run\". To prevent these attempts, you can use:\n\
- set startup-with-shell off"),
- ex.what ());
- return false;
- }
- gdb_printf (_("Note: this version of macOS has System Integrity Protection.\n\
- Because `startup-with-shell' is enabled, gdb has worked around this by\n\
- caching a copy of your shell. The shell used by \"run\" is now:\n\
- %s\n"),
- new_name.c_str ());
- }
- /* We need to make sure that the new name has the correct lifetime. */
- static std::string saved_shell = std::move (new_name);
- copied_shell = saved_shell.c_str ();
- #endif /* SF_RESTRICTED */
- return true;
- }
- void
- darwin_nat_target::create_inferior (const char *exec_file,
- const std::string &allargs,
- char **env, int from_tty)
- {
- gdb::optional<scoped_restore_tmpl<bool>> restore_startup_with_shell;
- darwin_nat_target *the_target = this;
- if (startup_with_shell && may_have_sip ())
- {
- if (!maybe_cache_shell ())
- {
- warning (_("startup-with-shell is now temporarily disabled"));
- restore_startup_with_shell.emplace (&startup_with_shell, 0);
- }
- }
- /* Do the hard work. */
- fork_inferior (exec_file, allargs, env, darwin_ptrace_me,
- [the_target] (int pid)
- {
- the_target->ptrace_him (pid);
- },
- darwin_pre_ptrace, copied_shell,
- darwin_execvp);
- }
- /* Set things up such that the next call to darwin_wait will immediately
- return a fake stop event for inferior INF.
- This assumes that the inferior's thread list has been initialized,
- as it will suspend the inferior's first thread. */
- static void
- darwin_setup_fake_stop_event (struct inferior *inf)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- darwin_thread_t *thread;
- kern_return_t kret;
- gdb_assert (darwin_inf_fake_stop == NULL);
- darwin_inf_fake_stop = inf;
- /* When detecting a fake pending stop event, darwin_wait returns
- an event saying that the first thread is in a DARWIN_STOPPED
- state. To make that accurate, we need to suspend that thread
- as well. Otherwise, we'll try resuming it when resuming the
- inferior, and get a warning because the thread's suspend count
- is already zero, making the resume request useless. */
- thread = priv->threads[0];
- kret = thread_suspend (thread->gdb_port);
- MACH_CHECK_ERROR (kret);
- }
- /* Attach to process PID, then initialize for debugging it
- and wait for the trace-trap that results from attaching. */
- void
- darwin_nat_target::attach (const char *args, int from_tty)
- {
- pid_t pid;
- struct inferior *inf;
- pid = parse_pid_to_attach (args);
- if (pid == getpid ()) /* Trying to masturbate? */
- error (_("I refuse to debug myself!"));
- target_announce_attach (from_tty, pid);
- if (pid == 0 || ::kill (pid, 0) < 0)
- error (_("Can't attach to process %d: %s (%d)"),
- pid, safe_strerror (errno), errno);
- inf = current_inferior ();
- inferior_appeared (inf, pid);
- inf->attach_flag = 1;
- darwin_attach_pid (inf);
- darwin_suspend_inferior (inf);
- init_thread_list (inf);
- darwin_inferior *priv = get_darwin_inferior (inf);
- darwin_check_osabi (priv, inferior_ptid.tid ());
- darwin_setup_fake_stop_event (inf);
- priv->no_ptrace = 1;
- }
- /* 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. */
- void
- darwin_nat_target::detach (inferior *inf, int from_tty)
- {
- darwin_inferior *priv = get_darwin_inferior (inf);
- kern_return_t kret;
- int res;
- /* Display message. */
- target_announce_detach (from_tty);
- /* If ptrace() is in use, stop the process. */
- if (!priv->no_ptrace)
- stop_inferior (inf);
- kret = darwin_restore_exception_ports (priv);
- MACH_CHECK_ERROR (kret);
- if (!priv->no_ptrace)
- {
- res = PTRACE (PT_DETACH, inf->pid, 0, 0);
- if (res != 0)
- warning (_("Unable to detach from process-id %d: %s (%d)"),
- inf->pid, safe_strerror (errno), errno);
- }
- darwin_reply_to_all_pending_messages (inf);
- /* When using ptrace, we have just performed a PT_DETACH, which
- resumes the inferior. On the other hand, when we are not using
- ptrace, we need to resume its execution ourselves. */
- if (priv->no_ptrace)
- darwin_resume_inferior (inf);
- mourn_inferior ();
- }
- std::string
- darwin_nat_target::pid_to_str (ptid_t ptid)
- {
- long tid = ptid.tid ();
- if (tid != 0)
- return string_printf (_("Thread 0x%lx of process %u"),
- tid, ptid.pid ());
- return normal_pid_to_str (ptid);
- }
- bool
- darwin_nat_target::thread_alive (ptid_t ptid)
- {
- return true;
- }
- /* 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 / written otherwise. */
- static int
- darwin_read_write_inferior (task_t task, CORE_ADDR addr,
- gdb_byte *rdaddr, const gdb_byte *wraddr,
- ULONGEST length)
- {
- kern_return_t kret;
- mach_vm_size_t res_length = 0;
- inferior_debug (8, _("darwin_read_write_inferior(task=0x%x, %s, len=%s)\n"),
- task, core_addr_to_string (addr), pulongest (length));
- /* First read. */
- if (rdaddr != NULL)
- {
- mach_vm_size_t count;
- /* According to target.h(to_xfer_partial), one and only one may be
- non-null. */
- gdb_assert (wraddr == NULL);
- kret = mach_vm_read_overwrite (task, addr, length,
- (mach_vm_address_t) rdaddr, &count);
- if (kret != KERN_SUCCESS)
- {
- inferior_debug
- (1, _("darwin_read_write_inferior: mach_vm_read failed at %s: %s"),
- core_addr_to_string (addr), mach_error_string (kret));
- return 0;
- }
- return count;
- }
- /* See above. */
- gdb_assert (wraddr != NULL);
- while (length != 0)
- {
- mach_vm_address_t offset = addr & (mach_page_size - 1);
- mach_vm_address_t region_address = (mach_vm_address_t) (addr - offset);
- mach_vm_size_t aligned_length =
- (mach_vm_size_t) PAGE_ROUND (offset + length);
- vm_region_submap_short_info_data_64_t info;
- mach_msg_type_number_t count = VM_REGION_SUBMAP_SHORT_INFO_COUNT_64;
- natural_t region_depth = 1000;
- mach_vm_address_t region_start = region_address;
- mach_vm_size_t region_length;
- mach_vm_size_t write_length;
- /* Read page protection. */
- kret = mach_vm_region_recurse
- (task, ®ion_start, ®ion_length, ®ion_depth,
- (vm_region_recurse_info_t) &info, &count);
- if (kret != KERN_SUCCESS)
- {
- inferior_debug (1, _("darwin_read_write_inferior: "
- "mach_vm_region_recurse failed at %s: %s\n"),
- core_addr_to_string (region_address),
- mach_error_string (kret));
- return res_length;
- }
- inferior_debug
- (9, _("darwin_read_write_inferior: "
- "mach_vm_region_recurse addr=%s, start=%s, len=%s\n"),
- core_addr_to_string (region_address),
- core_addr_to_string (region_start),
- core_addr_to_string (region_length));
- /* Check for holes in memory. */
- if (region_start > region_address)
- {
- warning (_("No memory at %s (vs %s+0x%x). Nothing written"),
- core_addr_to_string (region_address),
- core_addr_to_string (region_start),
- (unsigned)region_length);
- return res_length;
- }
- /* Adjust the length. */
- region_length -= (region_address - region_start);
- if (region_length > aligned_length)
- region_length = aligned_length;
- /* Make the pages RW. */
- if (!(info.protection & VM_PROT_WRITE))
- {
- vm_prot_t prot = VM_PROT_READ | VM_PROT_WRITE;
- kret = mach_vm_protect (task, region_address, region_length,
- FALSE, prot);
- if (kret != KERN_SUCCESS)
- {
- prot |= VM_PROT_COPY;
- kret = mach_vm_protect (task, region_address, region_length,
- FALSE, prot);
- }
- if (kret != KERN_SUCCESS)
- {
- warning (_("darwin_read_write_inferior: "
- "mach_vm_protect failed at %s "
- "(len=0x%lx, prot=0x%x): %s"),
- core_addr_to_string (region_address),
- (unsigned long) region_length, (unsigned) prot,
- mach_error_string (kret));
- return res_length;
- }
- }
- if (offset + length > region_length)
- write_length = region_length - offset;
- else
- write_length = length;
- /* Write. */
- kret = mach_vm_write (task, addr, (vm_offset_t) wraddr, write_length);
- if (kret != KERN_SUCCESS)
- {
- warning (_("darwin_read_write_inferior: mach_vm_write failed: %s"),
- mach_error_string (kret));
- return res_length;
- }
- /* Restore page rights. */
- if (!(info.protection & VM_PROT_WRITE))
- {
- kret = mach_vm_protect (task, region_address, region_length,
- FALSE, info.protection);
- if (kret != KERN_SUCCESS)
- {
- warning (_("darwin_read_write_inferior: "
- "mach_vm_protect restore failed at %s "
- "(len=0x%lx): %s"),
- core_addr_to_string (region_address),
- (unsigned long) region_length,
- mach_error_string (kret));
- }
- }
- addr += write_length;
- wraddr += write_length;
- res_length += write_length;
- length -= write_length;
- }
- return res_length;
- }
- /* Read LENGTH bytes at offset ADDR of task_dyld_info for TASK, and copy them
- to RDADDR (in big endian).
- Return 0 on failure; number of bytes read / written otherwise. */
- #ifdef TASK_DYLD_INFO_COUNT
- /* This is not available in Darwin 9. */
- static enum target_xfer_status
- darwin_read_dyld_info (task_t task, CORE_ADDR addr, gdb_byte *rdaddr,
- ULONGEST length, ULONGEST *xfered_len)
- {
- struct task_dyld_info task_dyld_info;
- mach_msg_type_number_t count = TASK_DYLD_INFO_COUNT;
- kern_return_t kret;
- if (addr != 0 || length > sizeof (mach_vm_address_t))
- return TARGET_XFER_EOF;
- kret = task_info (task, TASK_DYLD_INFO,
- (task_info_t) &task_dyld_info, &count);
- MACH_CHECK_ERROR (kret);
- if (kret != KERN_SUCCESS)
- return TARGET_XFER_E_IO;
- store_unsigned_integer (rdaddr, length, BFD_ENDIAN_BIG,
- task_dyld_info.all_image_info_addr);
- *xfered_len = (ULONGEST) length;
- return TARGET_XFER_OK;
- }
- #endif
- enum target_xfer_status
- darwin_nat_target::xfer_partial (enum target_object object, const char *annex,
- gdb_byte *readbuf, const gdb_byte *writebuf,
- ULONGEST offset, ULONGEST len,
- ULONGEST *xfered_len)
- {
- struct inferior *inf = current_inferior ();
- darwin_inferior *priv = get_darwin_inferior (inf);
- inferior_debug
- (8, _("darwin_xfer_partial(%s, %s, rbuf=%s, wbuf=%s) pid=%u\n"),
- core_addr_to_string (offset), pulongest (len),
- host_address_to_string (readbuf), host_address_to_string (writebuf),
- inf->pid);
- switch (object)
- {
- case TARGET_OBJECT_MEMORY:
- {
- int l = darwin_read_write_inferior (priv->task, offset,
- readbuf, writebuf, len);
- if (l == 0)
- return TARGET_XFER_EOF;
- else
- {
- gdb_assert (l > 0);
- *xfered_len = (ULONGEST) l;
- return TARGET_XFER_OK;
- }
- }
- #ifdef TASK_DYLD_INFO_COUNT
- case TARGET_OBJECT_DARWIN_DYLD_INFO:
- if (writebuf != NULL || readbuf == NULL)
- {
- /* Support only read. */
- return TARGET_XFER_E_IO;
- }
- return darwin_read_dyld_info (priv->task, offset, readbuf, len,
- xfered_len);
- #endif
- default:
- return TARGET_XFER_E_IO;
- }
- }
- static void
- set_enable_mach_exceptions (const char *args, int from_tty,
- struct cmd_list_element *c)
- {
- if (inferior_ptid != null_ptid)
- {
- struct inferior *inf = current_inferior ();
- darwin_inferior *priv = get_darwin_inferior (inf);
- exception_mask_t mask;
- kern_return_t kret;
- if (enable_mach_exceptions)
- mask = EXC_MASK_ALL;
- else
- {
- darwin_restore_exception_ports (priv);
- mask = EXC_MASK_SOFTWARE | EXC_MASK_BREAKPOINT;
- }
- kret = task_set_exception_ports (priv->task, mask, darwin_ex_port,
- EXCEPTION_DEFAULT, THREAD_STATE_NONE);
- MACH_CHECK_ERROR (kret);
- }
- }
- char *
- darwin_nat_target::pid_to_exec_file (int pid)
- {
- static char path[PATH_MAX];
- int res;
- res = proc_pidinfo (pid, PROC_PIDPATHINFO, 0, path, PATH_MAX);
- if (res >= 0)
- return path;
- else
- return NULL;
- }
- ptid_t
- darwin_nat_target::get_ada_task_ptid (long lwp, ULONGEST thread)
- {
- struct inferior *inf = current_inferior ();
- darwin_inferior *priv = get_darwin_inferior (inf);
- kern_return_t kret;
- mach_port_name_array_t names;
- mach_msg_type_number_t names_count;
- mach_port_type_array_t types;
- mach_msg_type_number_t types_count;
- long res = 0;
- /* First linear search. */
- for (darwin_thread_t *t : priv->threads)
- {
- if (t->inf_port == lwp)
- return ptid_t (inferior_ptid.pid (), 0, t->gdb_port);
- }
- /* Maybe the port was never extract. Do it now. */
- /* First get inferior port names. */
- kret = mach_port_names (priv->task, &names, &names_count, &types,
- &types_count);
- MACH_CHECK_ERROR (kret);
- if (kret != KERN_SUCCESS)
- return null_ptid;
- /* For each name, copy the right in the gdb space and then compare with
- our view of the inferior threads. We don't forget to deallocate the
- right. */
- for (int i = 0; i < names_count; i++)
- {
- mach_port_t local_name;
- mach_msg_type_name_t local_type;
- /* We just need to know the corresponding name in gdb name space.
- So extract and deallocate the right. */
- kret = mach_port_extract_right (priv->task, names[i],
- MACH_MSG_TYPE_COPY_SEND,
- &local_name, &local_type);
- if (kret != KERN_SUCCESS)
- continue;
- mach_port_deallocate (gdb_task, local_name);
- for (darwin_thread_t *t : priv->threads)
- {
- if (t->gdb_port == local_name)
- {
- t->inf_port = names[i];
- if (names[i] == lwp)
- res = t->gdb_port;
- }
- }
- }
- vm_deallocate (gdb_task, (vm_address_t) names,
- names_count * sizeof (mach_port_t));
- if (res)
- return ptid_t (current_inferior ()->pid, 0, res);
- else
- return null_ptid;
- }
- bool
- darwin_nat_target::supports_multi_process ()
- {
- return true;
- }
- void _initialize_darwin_nat ();
- void
- _initialize_darwin_nat ()
- {
- kern_return_t kret;
- 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);
- }
- inferior_debug (2, _("GDB task: 0x%lx, pid: %d\n"),
- (unsigned long) mach_task_self (), getpid ());
- add_setshow_zuinteger_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);
- }
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