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Fix CPU feature identification for ppc32/64 - add more paranoia, and

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configure the sigill handler so that it can be used more than once.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5662
This commit is contained in:
Julian Seward 2006-02-21 17:11:11 +00:00
parent 65940e9512
commit bf2ba3210f
1 changed files with 25 additions and 8 deletions
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33
coregrind/m_machine.c
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@ -342,22 +342,30 @@ Bool VG_(machine_get_hwcaps)( void )
struct vki_sigaction saved_act, tmp_act;
volatile Bool have_F, have_V, have_FX, have_GX;
Int r;
VG_(sigemptyset)(&tmp_set);
VG_(sigaddset)(&tmp_set, VKI_SIGILL);
VG_(sigprocmask)(VKI_SIG_UNBLOCK, &tmp_set, &saved_set);
r = VG_(sigprocmask)(VKI_SIG_UNBLOCK, &tmp_set, &saved_set);
vg_assert(r == 0);
VG_(sigaction)(VKI_SIGILL, NULL, &saved_act);
r = VG_(sigaction)(VKI_SIGILL, NULL, &saved_act);
vg_assert(r == 0);
tmp_act = saved_act;
/* NODEFER: signal handler does not return (from the kernel's point of
view), hence if it is to successfully catch a signal more than once,
we need the NODEFER flag. */
tmp_act.sa_flags &= ~VKI_SA_RESETHAND;
tmp_act.sa_flags &= ~VKI_SA_SIGINFO;
tmp_act.sa_flags |= VKI_SA_NODEFER;
/* standard FP insns */
have_F = True;
tmp_act.ksa_handler = handler_sigill;
VG_(sigaction)(VKI_SIGILL, &tmp_act, NULL);
r = VG_(sigaction)(VKI_SIGILL, &tmp_act, NULL);
vg_assert(r == 0);
if (__builtin_setjmp(env_sigill)) {
have_F = False;
} else {
@ -367,7 +375,8 @@ Bool VG_(machine_get_hwcaps)( void )
/* Altivec insns */
have_V = True;
tmp_act.ksa_handler = handler_sigill;
VG_(sigaction)(VKI_SIGILL, &tmp_act, NULL);
r = VG_(sigaction)(VKI_SIGILL, &tmp_act, NULL);
vg_assert(r == 0);
if (__builtin_setjmp(env_sigill)) {
have_V = False;
} else {
@ -377,7 +386,8 @@ Bool VG_(machine_get_hwcaps)( void )
/* General-Purpose optional (fsqrt, fsqrts) */
have_FX = True;
tmp_act.ksa_handler = handler_sigill;
VG_(sigaction)(VKI_SIGILL, &tmp_act, NULL);
r = VG_(sigaction)(VKI_SIGILL, &tmp_act, NULL);
vg_assert(r == 0);
if (__builtin_setjmp(env_sigill)) {
have_FX = False;
} else {
@ -387,15 +397,18 @@ Bool VG_(machine_get_hwcaps)( void )
/* Graphics optional (stfiwx, fres, frsqrte, fsel) */
have_GX = True;
tmp_act.ksa_handler = handler_sigill;
VG_(sigaction)(VKI_SIGILL, &tmp_act, NULL);
r = VG_(sigaction)(VKI_SIGILL, &tmp_act, NULL);
vg_assert(r == 0);
if (__builtin_setjmp(env_sigill)) {
have_GX = False;
} else {
__asm__ __volatile__("frsqrte 0,0");
}
VG_(sigaction)(VKI_SIGILL, &saved_act, NULL);
VG_(sigprocmask)(VKI_SIG_SETMASK, &saved_set, NULL);
r = VG_(sigaction)(VKI_SIGILL, &saved_act, NULL);
vg_assert(r == 0);
r = VG_(sigprocmask)(VKI_SIG_SETMASK, &saved_set, NULL);
vg_assert(r == 0);
/*
VG_(printf)("F %d V %d FX %d GX %d\n",
(Int)have_F, (Int)have_V, (Int)have_FX, (Int)have_GX);
@ -439,8 +452,12 @@ Bool VG_(machine_get_hwcaps)( void )
VG_(sigaction)(VKI_SIGILL, NULL, &saved_act);
tmp_act = saved_act;
/* NODEFER: signal handler does not return (from the kernel's point of
view), hence if it is to successfully catch a signal more than once,
we need the NODEFER flag. */
tmp_act.sa_flags &= ~VKI_SA_RESETHAND;
tmp_act.sa_flags &= ~VKI_SA_SIGINFO;
tmp_act.sa_flags |= VKI_SA_NODEFER;
/* standard FP insns */
have_F = True;