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parasite: Introduce get_thread_ctx helper

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Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov
2013-10-30 17:48:08 +04:00
parent 77576c63ab
commit f0453c8e6f
1 changed files with 19 additions and 18 deletions
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37
parasite-syscall.c
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@@ -65,6 +65,21 @@ static struct vma_area *get_vma_by_ip(struct list_head *vma_area_list, unsigned
return NULL;
}
static int get_thread_ctx(int pid, struct thread_ctx *ctx)
{
if (ptrace(PTRACE_GETSIGMASK, pid, sizeof(k_rtsigset_t), &ctx->sigmask)) {
pr_perror("can't get signal blocking mask for %d", pid);
return -1;
}
if (ptrace(PTRACE_GETREGS, pid, NULL, &ctx->regs)) {
pr_perror("Can't obtain registers (pid: %d)", pid);
return -1;
}
return 0;
}
static int parasite_run(pid_t pid, unsigned long ip, void *stack,
user_regs_struct_t *regs, struct thread_ctx *octx)
{
@@ -506,20 +521,13 @@ int parasite_dump_thread_seized(struct parasite_ctl *ctl, int id,
args = parasite_args(ctl, struct parasite_dump_thread);
ret = ptrace(PTRACE_GETSIGMASK, pid, sizeof(k_rtsigset_t), &octx.sigmask);
if (ret) {
pr_perror("ptrace can't get signal blocking mask for %d", pid);
ret = get_thread_ctx(pid, &octx);
if (ret)
return -1;
}
tc->has_blk_sigset = true;
memcpy(&tc->blk_sigset, &octx.sigmask, sizeof(k_rtsigset_t));
ret = ptrace(PTRACE_GETREGS, pid, NULL, &octx.regs);
if (ret) {
pr_perror("Can't obtain registers (pid: %d)", pid);
return -1;
}
ret = parasite_execute_trap_by_pid(PARASITE_CMD_DUMP_THREAD, ctl,
pid, ctl->r_thread_stack, &octx);
if (ret) {
@@ -1020,15 +1028,8 @@ struct parasite_ctl *parasite_prep_ctl(pid_t pid, struct vm_area_list *vma_area_
ctl->tsock = -1;
if (ptrace(PTRACE_GETSIGMASK, pid, sizeof(k_rtsigset_t), &ctl->orig.sigmask)) {
pr_perror("ptrace doesn't support PTRACE_GETSIGMASK\n");
if (get_thread_ctx(pid, &ctl->orig))
goto err;
}
if (ptrace(PTRACE_GETREGS, pid, NULL, &ctl->orig.regs)) {
pr_err("Can't obtain registers (pid: %d)\n", pid);
goto err;
}
ctl->pid.real = pid;
ctl->pid.virt = 0;