Viewing file:  pr50305.c (1.41 KB) -rw-r--r--
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/* { dg-do compile } */
/* { dg-skip-if "incompatible options" { arm*-*-* } { "-march=*" } { "-march=armv7-a" } } */
/* { dg-skip-if "-mpure-code supports M-profile only" { *-*-* } { "-mpure-code" } } */
/* { dg-options "-O2 -fno-omit-frame-pointer -marm -march=armv7-a -mfpu=vfp3" } */
struct event {
unsigned long long id;
unsigned int flag;
};
void dummy(void)
{
/* This is here to ensure that the offset of perf_event_id below
relative to the LANCHOR symbol exceeds the allowed displacement. */
static int __warned[300];
__warned[0] = 1;
}
extern void *kmem_cache_alloc_trace (void *cachep);
extern void *cs_cachep;
extern int nr_cpu_ids;
struct event *
event_alloc (int cpu)
{
static unsigned long long __attribute__((aligned(8))) perf_event_id;
struct event *event;
unsigned long long result;
unsigned long tmp;
if (cpu >= nr_cpu_ids)
return 0;
event = kmem_cache_alloc_trace (cs_cachep);
__asm__ __volatile__ ("dmb" : : : "memory");
__asm__ __volatile__("@ atomic64_add_return\n"
"1: ldrexd %0, %H0, [%3]\n"
" adds %0, %0, %4\n"
" adc %H0, %H0, %H4\n"
" strexd %1, %0, %H0, [%3]\n"
" teq %1, #0\n"
" bne 1b"
: "=&r" (result), "=&r" (tmp), "+Qo" (perf_event_id)
: "r" (&perf_event_id), "r" (1LL)
: "cc");
__asm__ __volatile__ ("dmb" : : : "memory");
event->id = result;
if (cpu)
event->flag = 1;
for (cpu = 0; cpu < nr_cpu_ids; cpu++)
kmem_cache_alloc_trace (cs_cachep);
return event;
}
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