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define and use internal macros for hidden visibility, weak refs

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this cleans up what had become widespread direct inline use of "GNU C"
style attributes directly in the source, and lowers the barrier to
increased use of hidden visibility, which will be useful to recovering
some of the efficiency lost when the protected visibility hack was
dropped in commit dc2f368e56, especially
on archs where the PLT ABI is costly.
This commit is contained in:
Rich Felker
2018-09-05 14:05:14 -04:00
parent 2de29bc994
commit 9b95fd0944
38 changed files with 94 additions and 125 deletions
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arch/arm/atomic_arch.h
+3 -2
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@@ -1,11 +1,12 @@
#include "libc.h"
#if __ARM_ARCH_4__ || __ARM_ARCH_4T__ || __ARM_ARCH == 4
#define BLX "mov lr,pc\n\tbx"
#else
#define BLX "blx"
#endif
extern uintptr_t __attribute__((__visibility__("hidden")))
__a_cas_ptr, __a_barrier_ptr;
extern hidden uintptr_t __a_cas_ptr, __a_barrier_ptr;
#if ((__ARM_ARCH_6__ || __ARM_ARCH_6K__ || __ARM_ARCH_6KZ__ || __ARM_ARCH_6ZK__) && !__thumb__) \
|| __ARM_ARCH_6T2__ || __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
arch/arm/pthread_arch.h
+1 -1
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@@ -18,7 +18,7 @@ static inline pthread_t __pthread_self()
static inline pthread_t __pthread_self()
{
extern uintptr_t __attribute__((__visibility__("hidden"))) __a_gettp_ptr;
extern hidden uintptr_t __a_gettp_ptr;
register uintptr_t p __asm__("r0");
__asm__ __volatile__ ( BLX " %1" : "=r"(p) : "r"(__a_gettp_ptr) : "cc", "lr" );
return (void *)(p-sizeof(struct pthread));
arch/mips/syscall_arch.h
+1 -2
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@@ -3,8 +3,7 @@
((union { long long ll; long l[2]; }){ .ll = x }).l[1]
#define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
__attribute__((visibility("hidden")))
long (__syscall)(long, ...);
hidden long (__syscall)(long, ...);
#define SYSCALL_RLIM_INFINITY (-1UL/2)
arch/mipsn32/syscall_arch.h
+1 -2
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@@ -1,8 +1,7 @@
#define __SYSCALL_LL_E(x) (x)
#define __SYSCALL_LL_O(x) (x)
__attribute__((visibility("hidden")))
long (__syscall)(long, ...);
hidden long (__syscall)(long, ...);
#define SYSCALL_RLIM_INFINITY (-1UL/2)
arch/sh/atomic_arch.h
+3 -1
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@@ -1,3 +1,5 @@
#include "libc.h"
#if defined(__SH4A__)
#define a_ll a_ll
@@ -30,7 +32,7 @@ static inline void a_barrier()
#else
#define a_cas a_cas
__attribute__((__visibility__("hidden"))) extern const void *__sh_cas_ptr;
extern hidden const void *__sh_cas_ptr;
static inline int a_cas(volatile int *p, int t, int s)
{
register int r1 __asm__("r1");