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linux-user: report signals being taken in strace output

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Native strace reports when the process being traced takes a signal:
   --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} ---

Report something similar when QEMU is doing its internal strace of
the guest process and is about to deliver it a signal.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Peter Maydell 2016-07-18 18:12:24 +01:00 committed by Riku Voipio
parent ce9c139d93
commit 0cb581d6bd
3 changed files with 120 additions and 0 deletions
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10
linux-user/qemu.h
View File

@ -362,6 +362,16 @@ void print_syscall(int num,
abi_long arg1, abi_long arg2, abi_long arg3,
abi_long arg4, abi_long arg5, abi_long arg6);
void print_syscall_ret(int num, abi_long arg1);
/**
* print_taken_signal:
* @target_signum: target signal being taken
* @tinfo: target_siginfo_t which will be passed to the guest for the signal
*
* Print strace output indicating that this signal is being taken by the guest,
* in a format similar to:
* --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} ---
*/
void print_taken_signal(int target_signum, const target_siginfo_t *tinfo);
extern int do_strace;
/* signal.c */

4
linux-user/signal.c
View File

@ -5849,6 +5849,10 @@ static void handle_pending_signal(CPUArchState *cpu_env, int sig,
handler = sa->_sa_handler;
}
if (do_strace) {
print_taken_signal(sig, &k->info);
}
if (handler == TARGET_SIG_DFL) {
/* default handler : ignore some signal. The other are job control or fatal */
if (sig == TARGET_SIGTSTP || sig == TARGET_SIGTTIN || sig == TARGET_SIGTTOU) {

106
linux-user/strace.c
View File

@ -154,6 +154,100 @@ print_signal(abi_ulong arg, int last)
gemu_log("%s%s", signal_name, get_comma(last));
}
static void print_si_code(int arg)
{
const char *codename = NULL;
switch (arg) {
case SI_USER:
codename = "SI_USER";
break;
case SI_KERNEL:
codename = "SI_KERNEL";
break;
case SI_QUEUE:
codename = "SI_QUEUE";
break;
case SI_TIMER:
codename = "SI_TIMER";
break;
case SI_MESGQ:
codename = "SI_MESGQ";
break;
case SI_ASYNCIO:
codename = "SI_ASYNCIO";
break;
case SI_SIGIO:
codename = "SI_SIGIO";
break;
case SI_TKILL:
codename = "SI_TKILL";
break;
default:
gemu_log("%d", arg);
return;
}
gemu_log("%s", codename);
}
static void print_siginfo(const target_siginfo_t *tinfo)
{
/* Print a target_siginfo_t in the format desired for printing
* signals being taken. We assume the target_siginfo_t is in the
* internal form where the top 16 bits of si_code indicate which
* part of the union is valid, rather than in the guest-visible
* form where the bottom 16 bits are sign-extended into the top 16.
*/
int si_type = extract32(tinfo->si_code, 16, 16);
int si_code = sextract32(tinfo->si_code, 0, 16);
gemu_log("{si_signo=");
print_signal(tinfo->si_signo, 1);
gemu_log(", si_code=");
print_si_code(si_code);
switch (si_type) {
case QEMU_SI_KILL:
gemu_log(", si_pid = %u, si_uid = %u",
(unsigned int)tinfo->_sifields._kill._pid,
(unsigned int)tinfo->_sifields._kill._uid);
break;
case QEMU_SI_TIMER:
gemu_log(", si_timer1 = %u, si_timer2 = %u",
tinfo->_sifields._timer._timer1,
tinfo->_sifields._timer._timer2);
break;
case QEMU_SI_POLL:
gemu_log(", si_band = %d, si_fd = %d",
tinfo->_sifields._sigpoll._band,
tinfo->_sifields._sigpoll._fd);
break;
case QEMU_SI_FAULT:
gemu_log(", si_addr = ");
print_pointer(tinfo->_sifields._sigfault._addr, 1);
break;
case QEMU_SI_CHLD:
gemu_log(", si_pid = %u, si_uid = %u, si_status = %d"
", si_utime=" TARGET_ABI_FMT_ld
", si_stime=" TARGET_ABI_FMT_ld,
(unsigned int)(tinfo->_sifields._sigchld._pid),
(unsigned int)(tinfo->_sifields._sigchld._uid),
tinfo->_sifields._sigchld._status,
tinfo->_sifields._sigchld._utime,
tinfo->_sifields._sigchld._stime);
break;
case QEMU_SI_RT:
gemu_log(", si_pid = %u, si_uid = %u, si_sigval = " TARGET_ABI_FMT_ld,
(unsigned int)tinfo->_sifields._rt._pid,
(unsigned int)tinfo->_sifields._rt._uid,
tinfo->_sifields._rt._sigval.sival_ptr);
break;
default:
g_assert_not_reached();
}
gemu_log("}");
}
static void
print_sockaddr(abi_ulong addr, abi_long addrlen)
{
@ -2190,3 +2284,15 @@ print_syscall_ret(int num, abi_long ret)
break;
}
}
void print_taken_signal(int target_signum, const target_siginfo_t *tinfo)
{
/* Print the strace output for a signal being taken:
* --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} ---
*/
gemu_log("--- ");
print_signal(target_signum, 1);
gemu_log(" ");
print_siginfo(tinfo);
gemu_log(" ---\n");
}