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default to portable C for the thread id on arm 32-bit, issue #495

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daan 2021-12-17 13:48:39 -08:00
parent f5ea6c70bd
commit 30a99e2c51
1 changed files with 8 additions and 8 deletions
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16
include/mimalloc-internal.h
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@ -708,21 +708,21 @@ static inline mi_threadid_t _mi_thread_id(void) mi_attr_noexcept {
}
#elif defined(__GNUC__) && \
(defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__))
(defined(__x86_64__) || defined(__i386__) || defined(__aarch64__))
// TLS register on x86 is in the FS or GS register, see: https://akkadia.org/drepper/tls.pdf
// see also https://akkadia.org/drepper/tls.pdf for more info on the TLS register.
static inline void* mi_tls_slot(size_t slot) mi_attr_noexcept {
void* res;
const size_t ofs = (slot*sizeof(void*));
#if defined(__i386__)
__asm__("movl %%gs:%1, %0" : "=r" (res) : "m" (*((void**)ofs)) : ); // 32-bit always uses GS
__asm__("movl %%gs:%1, %0" : "=r" (res) : "m" (*((void**)ofs)) : ); // x86 32-bit always uses GS
#elif defined(__APPLE__) && defined(__x86_64__)
__asm__("movq %%gs:%1, %0" : "=r" (res) : "m" (*((void**)ofs)) : ); // x86_64 macOSX uses GS
#elif defined(__x86_64__) && (MI_INTPTR_SIZE==4)
__asm__("movl %%fs:%1, %0" : "=r" (res) : "m" (*((void**)ofs)) : ); // x32 ABI
#elif defined(__x86_64__)
__asm__("movq %%fs:%1, %0" : "=r" (res) : "m" (*((void**)ofs)) : ); // x86_64 Linux, BSD uses FS
#elif defined(__arm__)
#elif defined(__arm__) // arm32: defined but currently not used (see issue #495)
void** tcb; MI_UNUSED(ofs);
__asm__ volatile ("mrc p15, 0, %0, c13, c0, 3\nbic %0, %0, #3" : "=r" (tcb));
res = tcb[slot];
@ -739,7 +739,7 @@ static inline void* mi_tls_slot(size_t slot) mi_attr_noexcept {
return res;
}
// setting is only used on macOSX for now
// setting a tls slot is only used on macOSX for now
static inline void mi_tls_slot_set(size_t slot, void* value) mi_attr_noexcept {
const size_t ofs = (slot*sizeof(void*));
#if defined(__i386__)
@ -767,8 +767,8 @@ static inline void mi_tls_slot_set(size_t slot, void* value) mi_attr_noexcept {
}
static inline mi_threadid_t _mi_thread_id(void) mi_attr_noexcept {
#if defined(__arm__) || (defined(__ANDROID__) && defined(__aarch64__))
// issue #384, #495: on arm32 and arm32/arm64 Android, slot 1 is the thread ID (pointer to pthread internal struct)
#if defined(__ANDROID__) && (defined(__arm__) || defined(__aarch64__))
// issue #384, #495: on arm Android, slot 1 is the thread ID (pointer to pthread internal struct)
return (uintptr_t)mi_tls_slot(1);
#else
// in all our other targets, slot 0 is the pointer to the thread control block
@ -776,7 +776,7 @@ static inline mi_threadid_t _mi_thread_id(void) mi_attr_noexcept {
#endif
}
#else
// otherwise use standard C
// otherwise use portable C
static inline mi_threadid_t _mi_thread_id(void) mi_attr_noexcept {
return (uintptr_t)&_mi_heap_default;
}