| /******************************************************************************* |
| * Copyright (c) 2007, 2017 Wind River Systems, Inc. and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * and Eclipse Distribution License v1.0 which accompany this distribution. |
| * The Eclipse Public License is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * and the Eclipse Distribution License is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * You may elect to redistribute this code under either of these licenses. |
| * |
| * Contributors: |
| * Wind River Systems - initial API and implementation |
| *******************************************************************************/ |
| |
| /* |
| * This module handles process/thread OS contexts and their state machine. |
| */ |
| |
| #include <tcf/config.h> |
| |
| #if defined(__FreeBSD__) |
| |
| #if ENABLE_DebugContext && !ENABLE_ContextProxy |
| |
| #include <stdlib.h> |
| #include <assert.h> |
| #include <errno.h> |
| #include <signal.h> |
| #include <sched.h> |
| #include <sys/ptrace.h> |
| #include <tcf/framework/context.h> |
| #include <tcf/framework/events.h> |
| #include <tcf/framework/errors.h> |
| #include <tcf/framework/trace.h> |
| #include <tcf/framework/myalloc.h> |
| #include <tcf/framework/waitpid.h> |
| #include <tcf/framework/signames.h> |
| #include <tcf/services/symbols.h> |
| #include <tcf/services/breakpoints.h> |
| #include <system/FreeBSD/tcf/regset.h> |
| |
| #define PTRACE_TRACEME PT_TRACE_ME |
| #define PTRACE_ATTACH PT_ATTACH |
| #define PTRACE_GETREGS PT_GETREGS |
| #define PTRACE_SETREGS PT_SETREGS |
| #define PTRACE_PEEKDATA PT_READ_D |
| #define PTRACE_POKEDATA PT_WRITE_D |
| #define PTRACE_CONT PT_CONTINUE |
| #define PTRACE_SINGLESTEP PT_STEP |
| |
| #define USE_PTRACE_SYSCALL 0 |
| |
| typedef struct ContextExtensionBSD { |
| pid_t pid; |
| ContextAttachCallBack * attach_callback; |
| void * attach_data; |
| int ptrace_flags; |
| int ptrace_event; |
| int syscall_enter; |
| int syscall_exit; |
| int syscall_id; |
| ContextAddress syscall_pc; |
| ContextAddress loader_state; |
| int end_of_step; |
| REG_SET * regs; /* copy of context registers, updated when context stops */ |
| ErrorReport * regs_error; /* if not NULL, 'regs' is invalid */ |
| int regs_dirty; /* if not 0, 'regs' is modified and needs to be saved before context is continued */ |
| int pending_step; |
| } ContextExtensionBSD; |
| |
| static size_t context_extension_offset = 0; |
| |
| #define EXT(ctx) ((ContextExtensionBSD *)((char *)(ctx) + context_extension_offset)) |
| |
| #include <tcf/framework/pid-hash.h> |
| |
| static LINK pending_list = TCF_LIST_INIT(pending_list); |
| |
| static MemoryErrorInfo mem_err_info; |
| |
| static const char * event_name(int event) { |
| trace(LOG_ALWAYS, "event_name(): unexpected event code %d", event); |
| return "unknown"; |
| } |
| |
| const char * context_suspend_reason(Context * ctx) { |
| static char reason[128]; |
| |
| if (EXT(ctx)->end_of_step) return REASON_STEP; |
| if (EXT(ctx)->ptrace_event != 0) { |
| assert(ctx->signal == SIGTRAP); |
| snprintf(reason, sizeof(reason), "Event: %s", event_name(EXT(ctx)->ptrace_event)); |
| return reason; |
| } |
| if (ctx->signal == SIGSTOP || ctx->signal == SIGTRAP) return REASON_USER_REQUEST; |
| snprintf(reason, sizeof(reason), "Signal %d", ctx->signal); |
| return reason; |
| } |
| |
| int context_attach_self(void) { |
| if (ptrace(PTRACE_TRACEME, 0, 0, 0) < 0) { |
| int err = errno; |
| trace(LOG_ALWAYS, "error: ptrace(PTRACE_TRACEME) failed: pid %d, error %d %s", |
| getpid(), err, errno_to_str(err)); |
| errno = err; |
| return -1; |
| } |
| return 0; |
| } |
| |
| int context_attach(pid_t pid, ContextAttachCallBack * done, void * data, int mode) { |
| Context * ctx = NULL; |
| |
| assert(done != NULL); |
| trace(LOG_CONTEXT, "context: attaching pid %d", pid); |
| if ((mode & CONTEXT_ATTACH_SELF) == 0 && ptrace(PTRACE_ATTACH, pid, 0, 0) < 0) { |
| int err = errno; |
| trace(LOG_ALWAYS, "error: ptrace(PTRACE_ATTACH) failed: pid %d, error %d %s", |
| pid, err, errno_to_str(err)); |
| errno = err; |
| return -1; |
| } |
| add_waitpid_process(pid); |
| ctx = create_context(pid2id(pid, 0)); |
| ctx->mem = ctx; |
| ctx->mem_access |= MEM_ACCESS_INSTRUCTION; |
| ctx->mem_access |= MEM_ACCESS_DATA; |
| ctx->mem_access |= MEM_ACCESS_USER; |
| ctx->big_endian = big_endian_host(); |
| EXT(ctx)->pid = pid; |
| EXT(ctx)->attach_callback = done; |
| EXT(ctx)->attach_data = data; |
| list_add_first(&ctx->ctxl, &pending_list); |
| /* TODO: context_attach works only for main task in a process */ |
| return 0; |
| } |
| |
| int context_has_state(Context * ctx) { |
| return ctx != NULL && ctx->parent != NULL; |
| } |
| |
| int context_stop(Context * ctx) { |
| trace(LOG_CONTEXT, "context:%s suspending ctx %#lx id %s", |
| ctx->pending_intercept ? "" : " temporary", ctx, ctx->id); |
| assert(is_dispatch_thread()); |
| assert(!ctx->exited); |
| assert(!ctx->stopped); |
| assert(!EXT(ctx)->regs_dirty); |
| if (tkill(EXT(ctx)->pid, SIGSTOP) < 0) { |
| int err = errno; |
| if (err == ESRCH) { |
| ctx->exiting = 1; |
| return 0; |
| } |
| trace(LOG_ALWAYS, "error: tkill(SIGSTOP) failed: ctx %#lx, id %s, error %d %s", |
| ctx, ctx->id, err, errno_to_str(err)); |
| errno = err; |
| return -1; |
| } |
| return 0; |
| } |
| |
| int context_continue(Context * ctx) { |
| int signal = 0; |
| |
| assert(is_dispatch_thread()); |
| assert(ctx->stopped); |
| assert(!ctx->pending_intercept); |
| assert(!EXT(ctx)->pending_step); |
| assert(!ctx->exited); |
| |
| if (skip_breakpoint(ctx, 0)) return 0; |
| |
| if (!EXT(ctx)->ptrace_event) { |
| unsigned n = 0; |
| while (sigset_get_next(&ctx->pending_signals, &n)) { |
| if (sigset_get(&ctx->sig_dont_pass, n)) { |
| sigset_set(&ctx->pending_signals, n, 0); |
| } |
| else { |
| signal = n; |
| break; |
| } |
| } |
| assert(signal != SIGSTOP); |
| assert(signal != SIGTRAP); |
| } |
| |
| trace(LOG_CONTEXT, "context: resuming ctx %#lx, id %s, with signal %d", ctx, ctx->id, signal); |
| if (EXT(ctx)->regs_dirty) { |
| if (ptrace(PTRACE_SETREGS, EXT(ctx)->pid, 0, (int)EXT(ctx)->regs) < 0) { |
| int err = errno; |
| if (err == ESRCH) { |
| EXT(ctx)->regs_dirty = 0; |
| send_context_started_event(ctx); |
| return 0; |
| } |
| trace(LOG_ALWAYS, "error: ptrace(PTRACE_SETREGS) failed: ctx %#lx, id %s, error %d %s", |
| ctx, ctx->id, err, errno_to_str(err)); |
| errno = err; |
| return -1; |
| } |
| EXT(ctx)->regs_dirty = 0; |
| } |
| if (ptrace(PTRACE_CONT, EXT(ctx)->pid, 0, signal) < 0) { |
| int err = errno; |
| if (err == ESRCH) { |
| send_context_started_event(ctx); |
| return 0; |
| } |
| trace(LOG_ALWAYS, "error: ptrace(PTRACE_CONT, ...) failed: ctx %#lx, id %s, error %d %s", |
| ctx, ctx->id, err, errno_to_str(err)); |
| errno = err; |
| return -1; |
| } |
| sigset_set(&ctx->pending_signals, signal, 0); |
| send_context_started_event(ctx); |
| return 0; |
| } |
| |
| int context_single_step(Context * ctx) { |
| assert(is_dispatch_thread()); |
| assert(context_has_state(ctx)); |
| assert(ctx->stopped); |
| assert(!ctx->exited); |
| assert(!EXT(ctx)->pending_step); |
| |
| if (skip_breakpoint(ctx, 1)) return 0; |
| |
| trace(LOG_CONTEXT, "context: single step ctx %#lx, id %s", ctx, ctx->id); |
| if (EXT(ctx)->regs_dirty) { |
| if (ptrace(PTRACE_SETREGS, EXT(ctx)->pid, 0, (int)EXT(ctx)->regs) < 0) { |
| int err = errno; |
| if (err == ESRCH) { |
| EXT(ctx)->regs_dirty = 0; |
| EXT(ctx)->pending_step = 1; |
| send_context_started_event(ctx); |
| return 0; |
| } |
| trace(LOG_ALWAYS, "error: ptrace(PTRACE_SETREGS) failed: ctx %#lx, id %s, error %d %s", |
| ctx, ctx->id, err, errno_to_str(err)); |
| errno = err; |
| return -1; |
| } |
| EXT(ctx)->regs_dirty = 0; |
| } |
| if (ptrace(PTRACE_SINGLESTEP, EXT(ctx)->pid, 0, 0) < 0) { |
| int err = errno; |
| if (err == ESRCH) { |
| EXT(ctx)->pending_step = 1; |
| send_context_started_event(ctx); |
| return 0; |
| } |
| trace(LOG_ALWAYS, "error: ptrace(PTRACE_SINGLESTEP, ...) failed: ctx %#lx, id %s, error %d %s", |
| ctx, ctx->id, err, errno_to_str(err)); |
| errno = err; |
| return -1; |
| } |
| EXT(ctx)->pending_step = 1; |
| send_context_started_event(ctx); |
| return 0; |
| } |
| |
| int context_resume(Context * ctx, int mode, ContextAddress range_start, ContextAddress range_end) { |
| switch (mode) { |
| case RM_RESUME: |
| return context_continue(ctx); |
| case RM_STEP_INTO: |
| return context_single_step(ctx); |
| case RM_TERMINATE: |
| sigset_set(&ctx->pending_signals, SIGKILL, 1); |
| return context_continue(ctx); |
| } |
| errno = ERR_UNSUPPORTED; |
| return -1; |
| } |
| |
| int context_can_resume(Context * ctx, int mode) { |
| switch (mode) { |
| case RM_RESUME: |
| return 1; |
| case RM_STEP_INTO: |
| case RM_TERMINATE: |
| return context_has_state(ctx); |
| } |
| return 0; |
| } |
| |
| int context_write_mem(Context * ctx, ContextAddress address, void * buf, size_t size) { |
| ContextAddress word_addr; |
| unsigned word_size = context_word_size(ctx); |
| assert(is_dispatch_thread()); |
| assert(!ctx->exited); |
| trace(LOG_CONTEXT, "context: write memory ctx %#lx, id %s, address %#lx, size %zu", |
| ctx, ctx->id, address, size); |
| assert(word_size <= sizeof(unsigned long)); |
| if (check_breakpoints_on_memory_write(ctx, address, buf, size) < 0) return -1; |
| for (word_addr = address & ~((ContextAddress)word_size - 1); word_addr < address + size; word_addr += word_size) { |
| unsigned long word = 0; |
| if (word_addr < address || word_addr + word_size > address + size) { |
| size_t i; |
| errno = 0; |
| word = ptrace(PTRACE_PEEKDATA, EXT(ctx)->pid, (char *)word_addr, 0); |
| if (errno != 0) { |
| int err = errno; |
| trace(LOG_CONTEXT, "error: ptrace(PTRACE_PEEKDATA, ...) failed: ctx %#lx, id %s, addr %#lx, error %d %s", |
| ctx, ctx->id, word_addr, err, errno_to_str(err)); |
| errno = err; |
| return -1; |
| } |
| for (i = 0; i < word_size; i++) { |
| if (word_addr + i >= address && word_addr + i < address + size) { |
| ((char *)&word)[i] = ((char *)buf)[word_addr + i - address]; |
| } |
| } |
| } |
| else { |
| memcpy(&word, (char *)buf + (word_addr - address), word_size); |
| } |
| if (ptrace(PTRACE_POKEDATA, EXT(ctx)->pid, (char *)word_addr, word) < 0) { |
| int err = errno; |
| trace(LOG_ALWAYS, "error: ptrace(PTRACE_POKEDATA, ...) failed: ctx %#lx, id %s, addr %#lx, error %d %s", |
| ctx, ctx->id, word_addr, err, errno_to_str(err)); |
| errno = err; |
| return -1; |
| } |
| } |
| return 0; |
| } |
| |
| int context_read_mem(Context * ctx, ContextAddress address, void * buf, size_t size) { |
| ContextAddress word_addr; |
| unsigned word_size = context_word_size(ctx); |
| assert(is_dispatch_thread()); |
| assert(!ctx->exited); |
| trace(LOG_CONTEXT, "context: read memory ctx %#lx, id %s, address %#lx, size %zu", |
| ctx, ctx->id, address, size); |
| assert(word_size <= sizeof(unsigned long)); |
| for (word_addr = address & ~((ContextAddress)word_size - 1); word_addr < address + size; word_addr += word_size) { |
| unsigned long word = 0; |
| errno = 0; |
| word = ptrace(PTRACE_PEEKDATA, EXT(ctx)->pid, (char *)word_addr, 0); |
| if (errno != 0) { |
| int err = errno; |
| trace(LOG_CONTEXT, "error: ptrace(PTRACE_PEEKDATA, ...) failed: ctx %#lx, id %s, addr %#lx, error %d %s", |
| ctx, ctx->id, word_addr, err, errno_to_str(err)); |
| errno = err; |
| return -1; |
| } |
| if (word_addr < address || word_addr + word_size > address + size) { |
| size_t i; |
| for (i = 0; i < word_size; i++) { |
| if (word_addr + i >= address && word_addr + i < address + size) { |
| ((char *)buf)[word_addr + i - address] = ((char *)&word)[i]; |
| } |
| } |
| } |
| else { |
| memcpy((char *)buf + (word_addr - address), &word, word_size); |
| } |
| } |
| return check_breakpoints_on_memory_read(ctx, address, buf, size); |
| } |
| |
| #if ENABLE_ExtendedMemoryErrorReports |
| int context_get_mem_error_info(MemoryErrorInfo * info) { |
| if (mem_err_info.error == 0) { |
| set_errno(ERR_OTHER, "Extended memory error info not available"); |
| return -1; |
| } |
| *info = mem_err_info; |
| return 0; |
| } |
| #endif |
| |
| int context_write_reg(Context * ctx, RegisterDefinition * def, unsigned offs, unsigned size, void * buf) { |
| ContextExtensionBSD * ext = EXT(ctx); |
| |
| assert(is_dispatch_thread()); |
| assert(context_has_state(ctx)); |
| assert(ctx->stopped); |
| assert(!ctx->exited); |
| assert(offs + size <= def->size); |
| |
| if (ext->regs_error) { |
| set_error_report_errno(ext->regs_error); |
| return -1; |
| } |
| memcpy((uint8_t *)ext->regs + def->offset + offs, buf, size); |
| ext->regs_dirty = 1; |
| return 0; |
| } |
| |
| int context_read_reg(Context * ctx, RegisterDefinition * def, unsigned offs, unsigned size, void * buf) { |
| ContextExtensionBSD * ext = EXT(ctx); |
| |
| assert(is_dispatch_thread()); |
| assert(context_has_state(ctx)); |
| assert(ctx->stopped); |
| assert(!ctx->exited); |
| assert(offs + size <= def->size); |
| |
| if (ext->regs_error) { |
| set_error_report_errno(ext->regs_error); |
| return -1; |
| } |
| memcpy(buf, (uint8_t *)ext->regs + def->offset + offs, size); |
| return 0; |
| } |
| |
| unsigned context_word_size(Context * ctx) { |
| return sizeof(void *); |
| } |
| |
| int context_get_canonical_addr(Context * ctx, ContextAddress addr, |
| Context ** canonical_ctx, ContextAddress * canonical_addr, |
| ContextAddress * block_addr, ContextAddress * block_size) { |
| /* Direct mapping, page size is irrelevant */ |
| ContextAddress page_size = 0x100000; |
| assert(is_dispatch_thread()); |
| *canonical_ctx = ctx->mem; |
| if (canonical_addr != NULL) *canonical_addr = addr; |
| if (block_addr != NULL) *block_addr = addr & ~(page_size - 1); |
| if (block_size != NULL) *block_size = page_size; |
| return 0; |
| } |
| |
| Context * context_get_group(Context * ctx, int group) { |
| static Context * cpu_group = NULL; |
| switch (group) { |
| case CONTEXT_GROUP_INTERCEPT: |
| return ctx; |
| case CONTEXT_GROUP_CPU: |
| if (cpu_group == NULL) cpu_group = create_context("CPU"); |
| return cpu_group; |
| } |
| return ctx->mem; |
| } |
| |
| int context_get_supported_bp_access_types(Context * ctx) { |
| return 0; |
| } |
| |
| int context_plant_breakpoint(ContextBreakpoint * bp) { |
| errno = ERR_UNSUPPORTED; |
| return -1; |
| } |
| |
| int context_unplant_breakpoint(ContextBreakpoint * bp) { |
| errno = ERR_UNSUPPORTED; |
| return -1; |
| } |
| |
| int context_get_memory_map(Context * ctx, MemoryMap * map) { |
| ctx = ctx->mem; |
| assert(!ctx->exited); |
| return 0; |
| } |
| |
| #if ENABLE_ContextISA |
| int context_get_isa(Context * ctx, ContextAddress addr, ContextISA * isa) { |
| memset(isa, 0, sizeof(ContextISA)); |
| #if defined(__i386__) |
| isa->def = "386"; |
| #elif defined(__x86_64__) |
| isa->def = "X86_64"; |
| #else |
| isa->def = NULL; |
| #endif |
| #if SERVICE_Symbols |
| if (get_context_isa(ctx, addr, &isa->isa, &isa->addr, &isa->size) < 0) return -1; |
| #endif |
| return 0; |
| } |
| #endif |
| |
| static Context * find_pending(pid_t pid) { |
| LINK * l = pending_list.next; |
| while (l != &pending_list) { |
| Context * c = ctxl2ctxp(l); |
| if (EXT(c)->pid == pid) { |
| list_remove(&c->ctxl); |
| return c; |
| } |
| l = l->next; |
| } |
| return NULL; |
| } |
| |
| static void event_pid_exited(pid_t pid, int status, int signal) { |
| Context * ctx; |
| |
| ctx = context_find_from_pid(pid, 1); |
| if (ctx == NULL) { |
| ctx = find_pending(pid); |
| if (ctx == NULL) { |
| trace(LOG_EVENTS, "event: ctx not found, pid %d, exit status %d, term signal %d", pid, status, signal); |
| } |
| else { |
| assert(ctx->ref_count == 0); |
| ctx->ref_count = 1; |
| if (EXT(ctx)->attach_callback != NULL) { |
| if (status == 0) status = EINVAL; |
| EXT(ctx)->attach_callback(status, ctx, EXT(ctx)->attach_data); |
| } |
| assert(list_is_empty(&ctx->children)); |
| assert(ctx->parent == NULL); |
| ctx->exited = 1; |
| context_unlock(ctx); |
| } |
| } |
| else { |
| /* Note: ctx->exiting should be 1 here. However, PTRACE_EVENT_EXIT can be lost by PTRACE because of racing |
| * between PTRACE_CONT (or PTRACE_SYSCALL) and SIGTRAP/PTRACE_EVENT_EXIT. So, ctx->exiting can be 0. |
| */ |
| if (EXT(ctx->parent)->pid == pid) ctx = ctx->parent; |
| assert(EXT(ctx)->attach_callback == NULL); |
| if (ctx->exited) { |
| trace(LOG_EVENTS, "event: ctx %#lx, pid %d, exit status %d unexpected, stopped %d, exited %d", |
| ctx, pid, status, ctx->stopped, ctx->exited); |
| } |
| else { |
| trace(LOG_EVENTS, "event: ctx %#lx, pid %d, exit status %d, term signal %d", ctx, pid, status, signal); |
| ctx->exiting = 1; |
| if (ctx->stopped) send_context_started_event(ctx); |
| if (!list_is_empty(&ctx->children)) { |
| LINK * l = ctx->children.next; |
| while (l != &ctx->children) { |
| Context * c = cldl2ctxp(l); |
| l = l->next; |
| assert(c->parent == ctx); |
| if (!c->exited) { |
| c->exiting = 1; |
| if (c->stopped) send_context_started_event(c); |
| release_error_report(EXT(c)->regs_error); |
| loc_free(EXT(c)->regs); |
| EXT(c)->regs_error = NULL; |
| EXT(c)->regs = NULL; |
| send_context_exited_event(c); |
| } |
| } |
| } |
| release_error_report(EXT(ctx)->regs_error); |
| loc_free(EXT(ctx)->regs); |
| EXT(ctx)->regs_error = NULL; |
| EXT(ctx)->regs = NULL; |
| send_context_exited_event(ctx); |
| } |
| } |
| } |
| |
| static void event_pid_stopped(pid_t pid, int signal, int event, int syscall) { |
| int stopped_by_exception = 0; |
| Context * ctx = NULL; |
| |
| trace(LOG_EVENTS, "event: pid %d stopped, signal %d, event %s", pid, signal, event_name(event)); |
| |
| ctx = context_find_from_pid(pid, 1); |
| |
| if (ctx == NULL) { |
| ctx = find_pending(pid); |
| if (ctx != NULL) { |
| Context * prs = ctx; |
| assert(prs->ref_count == 0); |
| ctx = create_context(pid2id(pid, pid)); |
| EXT(ctx)->pid = pid; |
| EXT(ctx)->regs = (REG_SET *)loc_alloc(sizeof(REG_SET)); |
| ctx->pending_intercept = 1; |
| ctx->mem = prs; |
| ctx->parent = prs; |
| ctx->big_endian = prs->big_endian; |
| prs->ref_count++; |
| list_add_last(&ctx->cldl, &prs->children); |
| link_context(prs); |
| link_context(ctx); |
| send_context_created_event(prs); |
| send_context_created_event(ctx); |
| if (EXT(prs)->attach_callback) { |
| EXT(prs)->attach_callback(0, prs, EXT(prs)->attach_data); |
| EXT(prs)->attach_callback = NULL; |
| EXT(prs)->attach_data = NULL; |
| } |
| } |
| } |
| |
| if (ctx == NULL) return; |
| |
| assert(!ctx->exited); |
| assert(!EXT(ctx)->attach_callback); |
| |
| if (signal != SIGSTOP && signal != SIGTRAP) { |
| sigset_set(&ctx->pending_signals, signal, 1); |
| if (sigset_get(&ctx->sig_dont_stop, signal) == 0) { |
| ctx->pending_intercept = 1; |
| stopped_by_exception = 1; |
| } |
| } |
| |
| if (ctx->stopped) { |
| send_context_changed_event(ctx); |
| } |
| else { |
| ContextAddress pc0 = 0; |
| ContextAddress pc1 = 0; |
| |
| assert(!EXT(ctx)->regs_dirty); |
| |
| EXT(ctx)->end_of_step = 0; |
| EXT(ctx)->ptrace_event = event; |
| ctx->signal = signal; |
| ctx->stopped_by_bp = 0; |
| ctx->stopped_by_exception = stopped_by_exception; |
| ctx->stopped = 1; |
| |
| get_PC(ctx, &pc0); |
| if (EXT(ctx)->regs_error) { |
| release_error_report(EXT(ctx)->regs_error); |
| EXT(ctx)->regs_error = NULL; |
| } |
| if (ptrace(PTRACE_GETREGS, EXT(ctx)->pid, 0, (int)EXT(ctx)->regs) < 0) { |
| assert(errno != 0); |
| if (errno == ESRCH) { |
| /* Racing condition: somebody resumed this context while we are handling stop event. |
| * |
| * One possible cause: main thread has exited forcing children to exit too. |
| * I beleive it is a bug in PTRACE implementation - PTRACE should delay exiting of |
| * a context while it is stopped, but it does not, which causes a nasty racing. |
| * |
| * Workaround: Ignore current event, assume context is running. |
| */ |
| ctx->stopped = 0; |
| return; |
| } |
| EXT(ctx)->regs_error = get_error_report(errno); |
| trace(LOG_ALWAYS, "error: ptrace(PTRACE_GETREGS) failed; id %s, error %d %s", |
| ctx->id, errno, errno_to_str(errno)); |
| } |
| get_PC(ctx, &pc1); |
| |
| trace(LOG_EVENTS, "event: pid %d stopped at PC = %#lx", pid, pc1); |
| |
| if (signal == SIGTRAP && event == 0 && !syscall) { |
| #ifdef TRAP_OFFSET |
| offs = -(TRAP_OFFSET); |
| #else |
| size_t break_size = 0; |
| get_break_instruction(ctx, &break_size); |
| offs = break_size; |
| #endif |
| ctx->stopped_by_bp = !EXT(ctx)->regs_error && is_breakpoint_address(ctx, pc1 - offs); |
| if (offs != 0 && ctx->stopped_by_bp && set_PC(ctx, pc1 - offs) < 0) { |
| trace(LOG_ALWAYS, "Cannot adjust PC after breakpoint: %s", errno_to_str(errno)); |
| } |
| EXT(ctx)->end_of_step = !ctx->stopped_by_bp && EXT(ctx)->pending_step; |
| } |
| EXT(ctx)->pending_step = 0; |
| send_context_stopped_event(ctx); |
| } |
| } |
| |
| static void waitpid_listener(int pid, int exited, int exit_code, int signal, int event_code, int syscall, void * args) { |
| if (exited) { |
| event_pid_exited(pid, exit_code, signal); |
| } |
| else { |
| event_pid_stopped(pid, signal, event_code, syscall); |
| } |
| } |
| |
| void init_contexts_sys_dep(void) { |
| context_extension_offset = context_extension(sizeof(ContextExtensionBSD)); |
| add_waitpid_listener(waitpid_listener, NULL); |
| ini_context_pid_hash(); |
| } |
| |
| #endif /* if ENABLE_DebugContext */ |
| #endif /* __FreeBSD__ */ |