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| author | Rich Felker <dalias@aerifal.cx> | 2018-10-01 18:37:02 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2018-10-01 18:37:02 -0400 |
| commit | 0beb9dfbecad38af9759b1e83eeb007e28b70abb (patch) | |
| tree | 75c42c8b544a480ba0a7664ebe83d88de654cd60 /arch | |
| parent | 4d0a82170a25464c39522d7190b9fe302045ddb2 (diff) | |
| download | musl-0beb9dfbecad38af9759b1e83eeb007e28b70abb.tar.gz musl-0beb9dfbecad38af9759b1e83eeb007e28b70abb.tar.xz musl-0beb9dfbecad38af9759b1e83eeb007e28b70abb.zip | |
add TLSDESC support for 32-bit arm
unlike other asm where the baseline ISA is used, these functions are hot paths and use ISA-level specializations. call-clobbered vfp registers are saved before calling __tls_get_new, since there is no guarantee it won't use them. while setjmp/longjmp have to use hwcap to decide whether to the fpu is in use, since application code could be using vfp registers even if libc was compiled as pure softfloat, __tls_get_new is part of libc and can be assumed not to have access to vfp registers if tlsdesc.S does not. thus it suffices just to check the predefined preprocessor macros. the check for __ARM_PCS_VFP is redundant; !__SOFTFP__ must always be true if the target ISA level includes fpu instructions/registers.
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/reloc.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm/reloc.h b/arch/arm/reloc.h index 4b00bf64..2c2e7f58 100644 --- a/arch/arm/reloc.h +++ b/arch/arm/reloc.h @@ -26,7 +26,9 @@ #define REL_DTPMOD R_ARM_TLS_DTPMOD32 #define REL_DTPOFF R_ARM_TLS_DTPOFF32 #define REL_TPOFF R_ARM_TLS_TPOFF32 -//#define REL_TLSDESC R_ARM_TLS_DESC +#define REL_TLSDESC R_ARM_TLS_DESC + +#define TLSDESC_BACKWARDS #define CRTJMP(pc,sp) __asm__ __volatile__( \ "mov sp,%1 ; bx %0" : : "r"(pc), "r"(sp) : "memory" ) |