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bsd-user/signal.c: Implement dump_core_and_abort 

Force delivering a signal and generating a core file. It's a global
function for the moment...

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Kyle Evans <kevans@freebsd.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2022-01-08 21:05:20 -07:00
parent fd5bec9ad2
commit 3771454783
2 changed files with 77 additions and 0 deletions
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76
bsd-user/signal.c
View File

@ -172,6 +172,82 @@ static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
tinfo->si_code = deposit32(si_code, 24, 8, si_type);
}
/* Returns 1 if given signal should dump core if not handled. */
static int core_dump_signal(int sig)
{
switch (sig) {
case TARGET_SIGABRT:
case TARGET_SIGFPE:
case TARGET_SIGILL:
case TARGET_SIGQUIT:
case TARGET_SIGSEGV:
case TARGET_SIGTRAP:
case TARGET_SIGBUS:
return 1;
default:
return 0;
}
}
/* Abort execution with signal. */
static void QEMU_NORETURN dump_core_and_abort(int target_sig)
{
CPUArchState *env = thread_cpu->env_ptr;
CPUState *cpu = env_cpu(env);
TaskState *ts = cpu->opaque;
int core_dumped = 0;
int host_sig;
struct sigaction act;
host_sig = target_to_host_signal(target_sig);
gdb_signalled(env, target_sig);
/* Dump core if supported by target binary format */
if (core_dump_signal(target_sig) && (ts->bprm->core_dump != NULL)) {
stop_all_tasks();
core_dumped =
((*ts->bprm->core_dump)(target_sig, env) == 0);
}
if (core_dumped) {
struct rlimit nodump;
/*
* We already dumped the core of target process, we don't want
* a coredump of qemu itself.
*/
getrlimit(RLIMIT_CORE, &nodump);
nodump.rlim_cur = 0;
setrlimit(RLIMIT_CORE, &nodump);
(void) fprintf(stderr, "qemu: uncaught target signal %d (%s) "
"- %s\n", target_sig, strsignal(host_sig), "core dumped");
}
/*
* The proper exit code for dying from an uncaught signal is
* -<signal>. The kernel doesn't allow exit() or _exit() to pass
* a negative value. To get the proper exit code we need to
* actually die from an uncaught signal. Here the default signal
* handler is installed, we send ourself a signal and we wait for
* it to arrive.
*/
memset(&act, 0, sizeof(act));
sigfillset(&act.sa_mask);
act.sa_handler = SIG_DFL;
sigaction(host_sig, &act, NULL);
kill(getpid(), host_sig);
/*
* Make sure the signal isn't masked (just reuse the mask inside
* of act).
*/
sigdelset(&act.sa_mask, host_sig);
sigsuspend(&act.sa_mask);
/* unreachable */
abort();
}
/*
* Queue a signal so that it will be send to the virtual CPU as soon as
* possible.

1
bsd-user/syscall_defs.h
View File

@ -21,6 +21,7 @@
#define _SYSCALL_DEFS_H_
#include <sys/syscall.h>
#include <sys/resource.h>
#include "errno_defs.h"