RepoMirrors
/
musl
mirror of git://git.musl-libc.org/musl
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

make thread-pointer-loading asm non-volatile 

this will allow the compiler to cache and reuse the result, meaning we
no longer have to take care not to load it more than once for the sake
of archs where the load may be expensive.

depends on commit 1c84c99913 for
correctness, since otherwise the compiler could hoist loads during
stage 3 of dynamic linking before the initial thread-pointer setup.
This commit is contained in:
Rich Felker 2018-10-16 14:08:01 -04:00
parent 7f01a734fe
commit a4a3e4dbc0
14 changed files with 19 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/aarch64/pthread_arch.h
View File

@ -1,7 +1,7 @@
static inline struct pthread *__pthread_self()
{
char *self;
__asm__ __volatile__ ("mrs %0,tpidr_el0" : "=r"(self));
__asm__ ("mrs %0,tpidr_el0" : "=r"(self));
return (void*)(self - sizeof(struct pthread));
}

4
arch/arm/pthread_arch.h
View File

@ -4,7 +4,7 @@
static inline pthread_t __pthread_self()
{
char *p;
__asm__ __volatile__ ( "mrc p15,0,%0,c13,c0,3" : "=r"(p) );
__asm__ ( "mrc p15,0,%0,c13,c0,3" : "=r"(p) );
return (void *)(p-sizeof(struct pthread));
}
@ -20,7 +20,7 @@ static inline pthread_t __pthread_self()
{
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" );
__asm__ ( BLX " %1" : "=r"(p) : "r"(__a_gettp_ptr) : "cc", "lr" );
return (void *)(p-sizeof(struct pthread));
}

2
arch/i386/pthread_arch.h
View File

@ -1,7 +1,7 @@
static inline struct pthread *__pthread_self()
{
struct pthread *self;
__asm__ __volatile__ ("movl %%gs:0,%0" : "=r" (self) );
__asm__ ("movl %%gs:0,%0" : "=r" (self) );
return self;
}

2
arch/microblaze/pthread_arch.h
View File

@ -1,7 +1,7 @@
static inline struct pthread *__pthread_self()
{
struct pthread *self;
__asm__ __volatile__ ("ori %0, r21, 0" : "=r" (self) );
__asm__ ("ori %0, r21, 0" : "=r" (self) );
return self;
}

4
arch/mips/pthread_arch.h
View File

@ -2,10 +2,10 @@ static inline struct pthread *__pthread_self()
{
#if __mips_isa_rev < 2
register char *tp __asm__("$3");
__asm__ __volatile__ (".word 0x7c03e83b" : "=r" (tp) );
__asm__ (".word 0x7c03e83b" : "=r" (tp) );
#else
char *tp;
__asm__ __volatile__ ("rdhwr %0, $29" : "=r" (tp) );
__asm__ ("rdhwr %0, $29" : "=r" (tp) );
#endif
return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));
}

4
arch/mips64/pthread_arch.h
View File

@ -2,10 +2,10 @@ static inline struct pthread *__pthread_self()
{
#if __mips_isa_rev < 2
register char *tp __asm__("$3");
__asm__ __volatile__ (".word 0x7c03e83b" : "=r" (tp) );
__asm__ (".word 0x7c03e83b" : "=r" (tp) );
#else
char *tp;
__asm__ __volatile__ ("rdhwr %0, $29" : "=r" (tp) );
__asm__ ("rdhwr %0, $29" : "=r" (tp) );
#endif
return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));
}

4
arch/mipsn32/pthread_arch.h
View File

@ -2,10 +2,10 @@ static inline struct pthread *__pthread_self()
{
#if __mips_isa_rev < 2
register char *tp __asm__("$3");
__asm__ __volatile__ (".word 0x7c03e83b" : "=r" (tp) );
__asm__ (".word 0x7c03e83b" : "=r" (tp) );
#else
char *tp;
__asm__ __volatile__ ("rdhwr %0, $29" : "=r" (tp) );
__asm__ ("rdhwr %0, $29" : "=r" (tp) );
#endif
return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));
}

4
arch/or1k/pthread_arch.h
View File

@ -3,10 +3,10 @@ static inline struct pthread *__pthread_self()
{
#ifdef __clang__
char *tp;
__asm__ __volatile__ ("l.ori %0, r10, 0" : "=r" (tp) );
__asm__ ("l.ori %0, r10, 0" : "=r" (tp) );
#else
register char *tp __asm__("r10");
__asm__ __volatile__ ("" : "=r" (tp) );
__asm__ ("" : "=r" (tp) );
#endif
return (struct pthread *) (tp - sizeof(struct pthread));
}

2
arch/powerpc/pthread_arch.h
View File

@ -1,7 +1,7 @@
static inline struct pthread *__pthread_self()
{
register char *tp __asm__("r2");
__asm__ __volatile__ ("" : "=r" (tp) );
__asm__ ("" : "=r" (tp) );
return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));
}

2
arch/powerpc64/pthread_arch.h
View File

@ -1,7 +1,7 @@
static inline struct pthread *__pthread_self()
{
register char *tp __asm__("r13");
__asm__ __volatile__ ("" : "=r" (tp) );
__asm__ ("" : "=r" (tp) );
return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));
}

2
arch/s390x/pthread_arch.h
View File

@ -1,7 +1,7 @@
static inline struct pthread *__pthread_self()
{
struct pthread *self;
__asm__ __volatile__ (
__asm__ (
"ear %0, %%a0\n"
"sllg %0, %0, 32\n"
"ear %0, %%a1\n"

2
arch/sh/pthread_arch.h
View File

@ -1,7 +1,7 @@
static inline struct pthread *__pthread_self()
{
char *self;
__asm__ __volatile__ ("stc gbr,%0" : "=r" (self) );
__asm__ ("stc gbr,%0" : "=r" (self) );
return (struct pthread *) (self - sizeof(struct pthread));
}

2
arch/x32/pthread_arch.h
View File

@ -1,7 +1,7 @@
static inline struct pthread *__pthread_self()
{
struct pthread *self;
__asm__ __volatile__ ("mov %%fs:0,%0" : "=r" (self) );
__asm__ ("mov %%fs:0,%0" : "=r" (self) );
return self;
}

2
arch/x86_64/pthread_arch.h
View File

@ -1,7 +1,7 @@
static inline struct pthread *__pthread_self()
{
struct pthread *self;
__asm__ __volatile__ ("mov %%fs:0,%0" : "=r" (self) );
__asm__ ("mov %%fs:0,%0" : "=r" (self) );
return self;
}