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Also work around clang bctrl issue in get_clockfreq.c

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Stan Shebs 2019-03-25 14:03:24 -07:00 committed by Fangrui Song
parent b930ad424b
commit 895947a3ca
1 changed files with 18 additions and 0 deletions
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18
sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
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@ -25,11 +25,29 @@
#include <libc-vdso.h>
#include <not-cancel.h>
#if defined __clang__ && defined __powerpc64__
/* On ppc, __get_clockfreq's body eventually expands into asm code
that does a bctrl, but clang does not recognize the need to save
the link register, so calls loop infinitely instead of returning.
As workaround, make a dummy function call that forces a link
register save. */
volatile int get_clockfreq_dummy_glob;
void __attribute__((noinline)) get_clockfreq_dummy ()
{
get_clockfreq_dummy_glob = 45;
}
#endif
hp_timing_t
__get_clockfreq (void)
{
hp_timing_t result = 0L;
#if defined __clang__ && defined __powerpc64__
get_clockfreq_dummy ();
#endif
#ifdef SHARED
/* The vDSO does not return an error (it clear cr0.so on returning). */
INTERNAL_SYSCALL_DECL (err);