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;
}
static void command_resume(char * token, Channel * c) {
char id[256];
long mode;
long count;
Context * ctx;
int err = 0;
json_read_string(&c->inp, id, sizeof(id));
if (read_stream(&c->inp) != 0) exception(ERR_JSON_SYNTAX);
mode = json_read_long(&c->inp);
if (read_stream(&c->inp) != 0) exception(ERR_JSON_SYNTAX);
count = json_read_long(&c->inp);
if (read_stream(&c->inp) != 0) exception(ERR_JSON_SYNTAX);
if (peek_stream(&c->inp) != MARKER_EOM) {
json_read_struct(&c->inp, resume_params_callback, &err);
if (read_stream(&c->inp) != 0) exception(ERR_JSON_SYNTAX);
}
if (read_stream(&c->inp) != MARKER_EOM) exception(ERR_JSON_SYNTAX);
if (err == 0) {
ctx = id2ctx(id);
assert(safe_event_list == NULL);
if (ctx == NULL) {
err = ERR_INV_CONTEXT;
}
else if (ctx->exited) {
err = ERR_ALREADY_EXITED;
}
else if (!ctx->intercepted) {
err = ERR_ALREADY_RUNNING;
}
else if (ctx->regs_error) {
err = ctx->regs_error;
}
else if (count != 1) {
err = EINVAL;
}
else if (mode == RM_RESUME || mode == RM_STEP_INTO) {
send_event_context_resumed(&c->bcg->out, ctx);
if (mode == RM_STEP_INTO) {
if (context_single_step(ctx) < 0) {
err = errno;
}
else {
ctx->pending_intercept = 1;
}
}
else if (context_continue(ctx) < 0) {
err = errno;
}
}
else {
err = EINVAL;
}
}
send_simple_result(c, token, err);
}
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:
return context_terminate(ctx);
}
errno = ERR_UNSUPPORTED;
return -1;
}
static void event_context_stopped(Context * ctx, void * client_data) {
TCFBroadcastGroup * bcg = client_data;
assert(ctx->stopped);
assert(!ctx->intercepted);
assert(!ctx->exited);
if (ctx->pending_safe_event) check_safe_events(ctx);
if (ctx->pending_signals != 0) {
send_event_context_exception(&bcg->out, ctx);
}
if (ctx->pending_intercept) {
send_event_context_suspended(&bcg->out, ctx);
flush_stream(&bcg->out);
}
if (!ctx->intercepted && safe_event_list == NULL) {
context_continue(ctx);
}
}
static void continue_temporary_stopped(void * arg) {
LINK * qp;
if ((uintptr_t)arg != safe_event_generation) return;
assert(safe_event_list == NULL);
if (channels_get_message_count(suspend_group) > 0) {
post_event(continue_temporary_stopped, (void *)safe_event_generation);
return;
}
for (qp = context_root.next; qp != &context_root; qp = qp->next) {
Context * ctx = ctxl2ctxp(qp);
if (ctx->exited) continue;
if (!ctx->stopped) continue;
if (ctx->intercepted) continue;
context_continue(ctx);
}
}
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;
if (syscall_never_returns(ctx)) return context_continue(ctx);
trace(LOG_CONTEXT, "context: single step ctx %#lx, id %S", ctx, ctx->id);
if (EXT(ctx)->regs_dirty) {
unsigned int state_count;
if (thread_set_state(EXT(ctx)->pid, x86_THREAD_STATE32, EXT(ctx)->regs, &state_count) != KERN_SUCCESS) {
int err = errno;
trace(LOG_ALWAYS, "error: thread_set_state 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(PT_STEP, 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(PT_STEP, ...) 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;
}
