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sparc: Fix syscall fallback bugs in VDSO.

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First, the trap number for 32-bit syscalls is 0x10.

Also, only negate the return value when syscall error is indicated by
the carry bit being set.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-10-17 21:28:01 -07:00
parent c343db455e
commit 776ca1543b
2 changed files with 16 additions and 1 deletions
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12
arch/sparc/vdso/vclock_gettime.c
View file

@ -33,9 +33,19 @@
#define TICK_PRIV_BIT (1ULL << 63)
#endif
#ifdef CONFIG_SPARC64
#define SYSCALL_STRING \
"ta 0x6d;" \
"sub %%g0, %%o0, %%o0;" \
"bcs,a 1f;" \
" sub %%g0, %%o0, %%o0;" \
"1:"
#else
#define SYSCALL_STRING \
"ta 0x10;" \
"bcs,a 1f;" \
" sub %%g0, %%o0, %%o0;" \
"1:"
#endif
#define SYSCALL_CLOBBERS \
"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \

5
tools/perf/util/event.c
View file

@ -1081,6 +1081,7 @@ void *cpu_map_data__alloc(struct cpu_map *map, size_t *size, u16 *type, int *max
}
*size += sizeof(struct cpu_map_data);
*size = PERF_ALIGN(*size, sizeof(u64));
return zalloc(*size);
}
@ -1560,7 +1561,9 @@ struct map *thread__find_map(struct thread *thread, u8 cpumode, u64 addr,
return NULL;
}
#if 0
try_again:
#endif
al->map = map_groups__find(mg, al->addr);
if (al->map == NULL) {
/*
@ -1572,6 +1575,7 @@ struct map *thread__find_map(struct thread *thread, u8 cpumode, u64 addr,
* "[vdso]" dso, but for now lets use the old trick of looking
* in the whole kernel symbol list.
*/
#if 0
if (cpumode == PERF_RECORD_MISC_USER && machine &&
mg != &machine->kmaps &&
machine__kernel_ip(machine, al->addr)) {
@ -1579,6 +1583,7 @@ struct map *thread__find_map(struct thread *thread, u8 cpumode, u64 addr,
load_map = true;
goto try_again;
}
#endif
} else {
/*
* Kernel maps might be changed when loading symbols so loading