| /* Darwin support for GDB, the GNU debugger. |
| Copyright (C) 2008-2024 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 "extract-store-integer.h" |
| #include "top.h" |
| #include "inferior.h" |
| #include "target.h" |
| #include "symfile.h" |
| #include "symtab.h" |
| #include "objfiles.h" |
| #include "cli/cli-cmds.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 "gdbsupport/scoped_restore.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), |
| private_thread_info_up (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 |
| = this->find_thread (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 (inferior *inf, 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 (inf->aspace.get (), 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 (inf, |
| 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) |
| { |
| if (exec_file == nullptr) |
| no_executable_specified_error (); |
| |
| std::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 = true; |
| |
| 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); |
| } |
| } |
| |
| const 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); |
| } |