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(handler): get_bsp() returns an integer, not a pointer.

Browse source 
(main): Do some silly FP computations.  On x86-64, this ensures
	that the signal handler invocations will always be called
	with the FPU-state saved as well.  Without this, the first
	signal was invoked without FPU-state, the second with, causing
	a spurious failure.

2004/11/17 02:06:25-08:00 mostang.com!davidm
(get_bsp): New function.
(handler): Clean up & check for error returns.
(main): Also fail if we didn't get SIGUSR2.

(Logical change 1.290)
This commit is contained in:
mostang.com!davidm 2005-05-03 09:13:17 +00:00
parent 3ff39e9fc9
commit d9445c1f46
1 changed files with 52 additions and 14 deletions
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66
tests/Gtest-resume-sig.c
View file

@ -1,5 +1,5 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2003 Hewlett-Packard Co
Copyright (C) 2003-2004 Hewlett-Packard Co
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
Permission is hereby granted, free of charge, to any person obtaining
@ -45,6 +45,20 @@ int nerrors;
int got_usr1, got_usr2;
char *sigusr1_sp;
uintptr_t
get_bsp (void)
{
#if UNW_TARGET_IA64
# ifdef __INTEL_COMPILER
return __getReg (_IA64_REG_AR_BSP);
# else
return (uintptr_t) __builtin_ia64_bsp ();
# endif
#else
return 0;
#endif
}
void
handler (int sig)
{
@ -53,15 +67,11 @@ handler (int sig)
unw_context_t uc;
unw_cursor_t c;
char foo;
int ret;
#if UNW_TARGET_IA64
# ifdef __ECC
void *bsp = (void *) __getReg(_IA64_REG_AR_BSP);
# else
void *bsp = __builtin_ia64_bsp ();
#endif
if (verbose)
printf ("bsp = %p\n", bsp);
printf ("bsp = %llx\n", (unsigned long long) get_bsp ());
#endif
if (verbose)
@ -80,15 +90,23 @@ handler (int sig)
signal (SIGUSR1, SIG_IGN);
signal (SIGUSR2, handler);
unw_getcontext(&uc);
unw_init_local(&c, &uc);
unw_step(&c); /* step to signal trampoline */
unw_step(&c); /* step to signaller frame (main ()) */
unw_get_reg(&c, UNW_REG_IP, &ip);
if ((ret = unw_getcontext (&uc)) < 0)
panic ("unw_getcontext() failed: ret=%d\n", ret);
if ((ret = unw_init_local (&c, &uc)) < 0)
panic ("unw_init_local() failed: ret=%d\n", ret);
if ((ret = unw_step (&c)) < 0) /* step to signal trampoline */
panic ("unw_step(1) failed: ret=%d\n", ret);
if ((ret = unw_step (&c)) < 0) /* step to signal trampoline */
panic ("unw_step(2) failed: ret=%d\n", ret);
if ((ret = unw_get_reg (&c, UNW_REG_IP, &ip)) < 0)
panic ("unw_get_reg(IP) failed: ret=%d\n", ret);
if (verbose)
printf ("resuming at 0x%lx, with SIGUSR2 pending\n",
(unsigned long) ip);
unw_resume(&c);
unw_resume (&c);
}
else if (sig == SIGUSR2)
{
@ -110,17 +128,37 @@ handler (int sig)
int
main (int argc, char **argv)
{
float d = 1.0;
int n = 0;
if (argc > 1)
verbose = 1;
signal (SIGUSR1, handler);
/* Use the FPU a bit; otherwise we get spurious errors should the
signal handler need to use the FPU for any reason. This seems to
happen on x86-64. */
while (d > 0.0)
{
d /= 2.0;
++n;
}
if (n > 9999)
return -1; /* can't happen, but don't tell the compiler... */
if (verbose)
printf ("sending SIGUSR1\n");
kill (getpid (), SIGUSR1);
if (!got_usr2)
panic ("failed to get SIGUSR2\n");
if (nerrors)
fprintf (stderr, "FAILURE: detected %d errors\n", nerrors);
{
fprintf (stderr, "FAILURE: detected %d errors\n", nerrors);
exit (-1);
}
if (verbose)
printf ("SUCCESS\n");