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ptrace_report_signal: save debug regs before to send SIGCHLD to tracer

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This commit is contained in:
Tomoki Shirasawa
2016-03-09 22:29:51 +09:00
parent bf0cf0a346
commit 3f16a9443e
2 changed files with 10 additions and 6 deletions
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15
arch/x86/kernel/syscall.c
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@ -473,6 +473,7 @@ void ptrace_report_signal(struct thread *thread, int sig)
proc->signal_flags &= ~SIGNAL_STOP_STOPPED;
}
parent_pid = proc->parent->pid;
save_debugreg(thread->ptrace_debugreg);
mcs_rwlock_writer_unlock(&proc->update_lock, &lock);
memset(&info, '\0', sizeof info);
@ -646,16 +647,16 @@ do_signal(unsigned long rc, void *regs0, struct thread *thread, struct sig_pendi
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
memset(&info, '\0', sizeof info);
info.si_signo = SIGCHLD;
info.si_code = CLD_STOPPED;
info._sifields._sigchld.si_pid = thread->proc->pid;
info._sifields._sigchld.si_status = (sig << 8) | 0x7f;
do_kill(cpu_local_var(current), thread->proc->parent->pid, -1, SIGCHLD, &info, 0);
if(ptraceflag){
ptrace_report_signal(thread, orgsig);
}
else{
memset(&info, '\0', sizeof info);
info.si_signo = SIGCHLD;
info.si_code = CLD_STOPPED;
info._sifields._sigchld.si_pid = thread->proc->pid;
info._sifields._sigchld.si_status = (sig << 8) | 0x7f;
do_kill(cpu_local_var(current), thread->proc->parent->pid, -1, SIGCHLD, &info, 0);
dkprintf("do_signal,SIGSTOP,changing state\n");
/* Update thread state in fork tree */
@ -708,6 +709,7 @@ do_signal(unsigned long rc, void *regs0, struct thread *thread, struct sig_pendi
info._sifields._sigchld.si_status = 0x0000ffff;
do_kill(cpu_local_var(current), proc->parent->pid, -1, SIGCHLD, &info, 0);
proc->signal_flags = SIGNAL_STOP_CONTINUED;
proc->status = PS_RUNNING;
dkprintf("do_signal,SIGCONT,do nothing\n");
break;
case SIGQUIT:
@ -1097,6 +1099,7 @@ done:
else if(sig == SIGCONT || ptracecont){
/* Wake up the target only when stopped by SIGSTOP */
sched_wakeup_thread(tthread, PS_STOPPED);
tthread->proc->status = PS_RUNNING;
}
}
}

1
kernel/process.c
View File

@ -2689,6 +2689,7 @@ sched_wakeup_thread(struct thread *thread, int valid_states)
irqstate = ihk_mc_spinlock_lock(&(v->runq_lock));
if (thread->status & valid_states) {
xchg4((int *)(&thread->proc->status), PS_RUNNING);
xchg4((int *)(&thread->status), PS_RUNNING);
status = 0;
}