diff options
Diffstat (limited to 'include/gcc/x86/ck_pr.h')
| -rw-r--r-- | include/gcc/x86/ck_pr.h | 157 |
1 files changed, 93 insertions, 64 deletions
diff --git a/include/gcc/x86/ck_pr.h b/include/gcc/x86/ck_pr.h index a04cebf..5194dee 100644 --- a/include/gcc/x86/ck_pr.h +++ b/include/gcc/x86/ck_pr.h @@ -45,15 +45,9 @@ /* Minimum requirements for the CK_PR interface are met. */ #define CK_F_PR -#ifdef CK_MD_UMP -#define CK_PR_LOCK_PREFIX -#else -#define CK_PR_LOCK_PREFIX "lock " -#endif - /* - * Prevent speculative execution in busy-wait loops (P4 <=) - * or "predefined delay". + * Prevent speculative execution in busy-wait loops (P4 <=) or "predefined + * delay". */ CK_CC_INLINE static void ck_pr_stall(void) @@ -62,28 +56,52 @@ ck_pr_stall(void) return; } +#ifdef CK_MD_UMP +#define CK_PR_LOCK_PREFIX +#define CK_PR_FENCE(T, I) \ + CK_CC_INLINE static void \ + ck_pr_fence_strict_##T(void) \ + { \ + __asm__ __volatile__("" ::: "memory"); \ + return; \ + } +#else +#define CK_PR_LOCK_PREFIX "lock " #define CK_PR_FENCE(T, I) \ CK_CC_INLINE static void \ ck_pr_fence_strict_##T(void) \ { \ __asm__ __volatile__(I ::: "memory"); \ + return; \ } +#endif /* CK_MD_UMP */ -CK_PR_FENCE(atomic, "sfence") -CK_PR_FENCE(atomic_store, "sfence") -CK_PR_FENCE(atomic_load, "mfence") -CK_PR_FENCE(store_atomic, "sfence") -CK_PR_FENCE(load_atomic, "mfence") -CK_PR_FENCE(load, "lfence") -CK_PR_FENCE(load_store, "mfence") -CK_PR_FENCE(store, "sfence") -CK_PR_FENCE(store_load, "mfence") -CK_PR_FENCE(memory, "mfence") -CK_PR_FENCE(release, "mfence") -CK_PR_FENCE(acquire, "mfence") -CK_PR_FENCE(acqrel, "mfence") -CK_PR_FENCE(lock, "mfence") -CK_PR_FENCE(unlock, "mfence") +#if defined(CK_MD_SSE_DISABLE) +/* If SSE is disabled, then use atomic operations for serialization. */ +#define CK_MD_X86_MFENCE "lock addl $0, (%%esp)" +#define CK_MD_X86_SFENCE CK_MD_X86_MFENCE +#define CK_MD_X86_LFENCE CK_MD_X86_MFENCE +#else +#define CK_MD_X86_SFENCE "sfence" +#define CK_MD_X86_LFENCE "lfence" +#define CK_MD_X86_MFENCE "mfence" +#endif /* !CK_MD_SSE_DISABLE */ + +CK_PR_FENCE(atomic, "") +CK_PR_FENCE(atomic_store, "") +CK_PR_FENCE(atomic_load, "") +CK_PR_FENCE(store_atomic, "") +CK_PR_FENCE(load_atomic, "") +CK_PR_FENCE(load, CK_MD_X86_LFENCE) +CK_PR_FENCE(load_store, CK_MD_X86_MFENCE) +CK_PR_FENCE(store, CK_MD_X86_SFENCE) +CK_PR_FENCE(store_load, CK_MD_X86_MFENCE) +CK_PR_FENCE(memory, CK_MD_X86_MFENCE) +CK_PR_FENCE(release, CK_MD_X86_MFENCE) +CK_PR_FENCE(acquire, CK_MD_X86_MFENCE) +CK_PR_FENCE(acqrel, CK_MD_X86_MFENCE) +CK_PR_FENCE(lock, CK_MD_X86_MFENCE) +CK_PR_FENCE(unlock, CK_MD_X86_MFENCE) #undef CK_PR_FENCE @@ -215,18 +233,18 @@ CK_PR_FAA_S(8, uint8_t, "xaddb") } #define CK_PR_UNARY_V(K, S, T, C, I) \ - CK_CC_INLINE static void \ - ck_pr_##K##_##S##_zero(T *target, bool *r) \ + CK_CC_INLINE static bool \ + ck_pr_##K##_##S##_is_zero(T *target) \ { \ + bool ret; \ __asm__ __volatile__(CK_PR_LOCK_PREFIX I " %0; setz %1" \ : "+m" (*(C *)target), \ - "=m" (*r) \ + "=qm" (ret) \ : \ : "memory", "cc"); \ - return; \ + return ret; \ } - #define CK_PR_UNARY_S(K, S, T, I) CK_PR_UNARY(K, S, T, T, I) #define CK_PR_GENERATE(K) \ @@ -289,8 +307,38 @@ CK_PR_GENERATE(xor) #undef CK_PR_BINARY /* - * Atomic compare and swap. + * Atomic compare and swap, with a variant that sets *v to the old value of target. */ +#ifdef __GCC_ASM_FLAG_OUTPUTS__ +#define CK_PR_CAS(S, M, T, C, I) \ + CK_CC_INLINE static bool \ + ck_pr_cas_##S(M *target, T compare, T set) \ + { \ + bool z; \ + __asm__ __volatile__(CK_PR_LOCK_PREFIX I " %3, %0" \ + : "+m" (*(C *)target), \ + "=@ccz" (z), \ + /* RAX is clobbered by cmpxchg. */ \ + "+a" (compare) \ + : "q" (set) \ + : "memory", "cc"); \ + return z; \ + } \ + \ + CK_CC_INLINE static bool \ + ck_pr_cas_##S##_value(M *target, T compare, T set, M *v) \ + { \ + bool z; \ + __asm__ __volatile__(CK_PR_LOCK_PREFIX I " %3, %0;" \ + : "+m" (*(C *)target), \ + "=@ccz" (z), \ + "+a" (compare) \ + : "q" (set) \ + : "memory", "cc"); \ + *(T *)v = compare; \ + return z; \ + } +#else #define CK_PR_CAS(S, M, T, C, I) \ CK_CC_INLINE static bool \ ck_pr_cas_##S(M *target, T compare, T set) \ @@ -303,7 +351,23 @@ CK_PR_GENERATE(xor) "a" (compare) \ : "memory", "cc"); \ return z; \ + } \ + \ + CK_CC_INLINE static bool \ + ck_pr_cas_##S##_value(M *target, T compare, T set, M *v) \ + { \ + bool z; \ + __asm__ __volatile__(CK_PR_LOCK_PREFIX I " %3, %0;" \ + "setz %1;" \ + : "+m" (*(C *)target), \ + "=q" (z), \ + "+a" (compare) \ + : "q" (set) \ + : "memory", "cc"); \ + *(T *)v = compare; \ + return z; \ } +#endif CK_PR_CAS(ptr, void, void *, char, "cmpxchgl") @@ -320,41 +384,6 @@ CK_PR_CAS_S(8, uint8_t, "cmpxchgb") #undef CK_PR_CAS /* - * Compare and swap, set *v to old value of target. - */ -#define CK_PR_CAS_O(S, M, T, C, I, R) \ - CK_CC_INLINE static bool \ - ck_pr_cas_##S##_value(M *target, T compare, T set, M *v) \ - { \ - bool z; \ - __asm__ __volatile__(CK_PR_LOCK_PREFIX "cmpxchg" I " %3, %0;" \ - "mov %% " R ", %2;" \ - "setz %1;" \ - : "+m" (*(C *)target), \ - "=a" (z), \ - "=m" (*(C *)v) \ - : "q" (set), \ - "a" (compare) \ - : "memory", "cc"); \ - return (bool)z; \ - } - -CK_PR_CAS_O(ptr, void, void *, char, "l", "eax") - -#define CK_PR_CAS_O_S(S, T, I, R) \ - CK_PR_CAS_O(S, T, T, T, I, R) - -CK_PR_CAS_O_S(char, char, "b", "al") -CK_PR_CAS_O_S(int, int, "l", "eax") -CK_PR_CAS_O_S(uint, unsigned int, "l", "eax") -CK_PR_CAS_O_S(32, uint32_t, "l", "eax") -CK_PR_CAS_O_S(16, uint16_t, "w", "ax") -CK_PR_CAS_O_S(8, uint8_t, "b", "al") - -#undef CK_PR_CAS_O_S -#undef CK_PR_CAS_O - -/* * Atomic bit test operations. */ #define CK_PR_BT(K, S, T, P, C, I) \ |