/* * Copyright 2009-2015 Samy Al Bahra. * Copyright 2013-2015 Olivier Houchard. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef CK_PR_ARM_H #define CK_PR_ARM_H #ifndef CK_PR_H #error Do not include this file directly, use ck_pr.h #endif #include #include /* * The following represent supported atomic operations. * These operations may be emulated. */ #include "ck_f_pr.h" /* * Minimum interface requirement met. */ #define CK_F_PR CK_CC_INLINE static void ck_pr_stall(void) { __asm__ __volatile__("" ::: "memory"); return; } #if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7VE__) #define CK_ISB __asm __volatile("isb" : : "r" (0) : "memory") #define CK_DMB __asm __volatile("dmb" : : "r" (0) : "memory") #define CK_DSB __asm __volatile("dsb" : : "r" (0) : "memory") /* FreeBSD's toolchain doesn't accept dmb st, so use the opcode instead */ #ifdef __FreeBSD__ #define CK_DMB_ST __asm __volatile(".word 0xf57ff05e" : : "r" (0) : "memory") #else #define CK_DMB_ST __asm __volatile("dmb st" : : "r" (0) : "memory") #endif /* __FreeBSD__ */ #else /* armv6 doesn't have dsb/dmb/isb, and no way to wait only for stores */ #define CK_ISB \ __asm __volatile("mcr p15, 0, %0, c7, c5, 4" : : "r" (0) : "memory") #define CK_DSB \ __asm __volatile("mcr p15, 0, %0, c7, c10, 4" : : "r" (0) : "memory") #define CK_DMB \ __asm __volatile("mcr p15, 0, %0, c7, c10, 5" : : "r" (0) : "memory") #define CK_DMB_ST CK_DMB #endif #define CK_PR_FENCE(T, I) \ CK_CC_INLINE static void \ ck_pr_fence_strict_##T(void) \ { \ I; \ } CK_PR_FENCE(atomic, CK_DMB_ST) CK_PR_FENCE(atomic_store, CK_DMB_ST) CK_PR_FENCE(atomic_load, CK_DMB_ST) CK_PR_FENCE(store_atomic, CK_DMB_ST) CK_PR_FENCE(load_atomic, CK_DMB) CK_PR_FENCE(store, CK_DMB_ST) CK_PR_FENCE(store_load, CK_DMB) CK_PR_FENCE(load, CK_DMB) CK_PR_FENCE(load_store, CK_DMB) CK_PR_FENCE(memory, CK_DMB) CK_PR_FENCE(acquire, CK_DMB) CK_PR_FENCE(release, CK_DMB) CK_PR_FENCE(acqrel, CK_DMB) CK_PR_FENCE(lock, CK_DMB) CK_PR_FENCE(unlock, CK_DMB) #undef CK_PR_FENCE #undef CK_ISB #undef CK_DSB #undef CK_DMB #undef CK_DMB_ST #define CK_PR_LOAD(S, M, T, C, I) \ CK_CC_INLINE static T \ ck_pr_md_load_##S(const M *target) \ { \ long r = 0; \ __asm__ __volatile__(I " %0, [%1];" \ : "=r" (r) \ : "r" (target) \ : "memory"); \ return ((T)r); \ } CK_PR_LOAD(ptr, void, void *, uint32_t, "ldr") #define CK_PR_LOAD_S(S, T, I) CK_PR_LOAD(S, T, T, T, I) CK_PR_LOAD_S(32, uint32_t, "ldr") CK_PR_LOAD_S(16, uint16_t, "ldrh") CK_PR_LOAD_S(8, uint8_t, "ldrb") CK_PR_LOAD_S(uint, unsigned int, "ldr") CK_PR_LOAD_S(int, int, "ldr") CK_PR_LOAD_S(short, short, "ldrh") CK_PR_LOAD_S(char, char, "ldrb") #undef CK_PR_LOAD_S #undef CK_PR_LOAD #if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7VE__) #define CK_PR_DOUBLE_LOAD(T, N) \ CK_CC_INLINE static T \ ck_pr_md_load_##N(const T *target) \ { \ register T ret; \ \ __asm __volatile("ldrexd %0, [%1]" \ : "=&r" (ret) \ : "r" (target) \ : "memory", "cc"); \ return (ret); \ } CK_PR_DOUBLE_LOAD(uint64_t, 64) #ifndef CK_PR_DISABLE_DOUBLE CK_PR_DOUBLE_LOAD(double, double) #endif #undef CK_PR_DOUBLE_LOAD #endif #define CK_PR_STORE(S, M, T, C, I) \ CK_CC_INLINE static void \ ck_pr_md_store_##S(M *target, T v) \ { \ __asm__ __volatile__(I " %1, [%0]" \ : \ : "r" (target), \ "r" (v) \ : "memory"); \ return; \ } CK_PR_STORE(ptr, void, const void *, uint32_t, "str") #define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I) CK_PR_STORE_S(32, uint32_t, "str") CK_PR_STORE_S(16, uint16_t, "strh") CK_PR_STORE_S(8, uint8_t, "strb") CK_PR_STORE_S(uint, unsigned int, "str") CK_PR_STORE_S(int, int, "str") CK_PR_STORE_S(short, short, "strh") CK_PR_STORE_S(char, char, "strb") #undef CK_PR_STORE_S #undef CK_PR_STORE #if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7VE__) #define CK_PR_DOUBLE_STORE(T, N) \ CK_CC_INLINE static void \ ck_pr_md_store_##N(const T *target, T value) \ { \ T tmp; \ uint32_t flag; \ __asm __volatile("1: \n" \ "ldrexd %0, [%2]\n" \ "strexd %1, %3, [%2]\n" \ "teq %1, #0\n" \ "it ne \n" \ "bne 1b\n" \ : "=&r" (tmp), "=&r" (flag) \ : "r" (target), "r" (value) \ : "memory", "cc"); \ } CK_PR_DOUBLE_STORE(uint64_t, 64) #ifndef CK_PR_DISABLE_DOUBLE CK_PR_DOUBLE_STORE(double, double) #endif #undef CK_PR_DOUBLE_STORE #define CK_PR_DOUBLE_CAS_VALUE(T, N) \ CK_CC_INLINE static bool \ ck_pr_cas_##N##_value(T *target, T compare, T set, T *value) \ { \ T previous; \ int tmp; \ \ __asm__ __volatile__("1:" \ "ldrexd %0, [%4];" \ "cmp %Q0, %Q2;" \ "ittt eq;" \ "cmpeq %R0, %R2;" \ "strexdeq %1, %3, [%4];" \ "cmpeq %1, #1;" \ "beq 1b;" \ :"=&r" (previous), "=&r" (tmp) \ : "r" (compare), "r" (set) , \ "r"(target) \ : "memory", "cc"); \ *value = previous; \ return (*value == compare); \ } CK_PR_DOUBLE_CAS_VALUE(uint64_t, 64) #ifndef CK_PR_DISABLE_DOUBLE CK_PR_DOUBLE_CAS_VALUE(double, double) #endif #undef CK_PR_DOUBLE_CAS_VALUE CK_CC_INLINE static bool ck_pr_cas_ptr_2_value(void *target, void *compare, void *set, void *value) { uint32_t *_compare = CK_CPP_CAST(uint32_t *, compare); uint32_t *_set = CK_CPP_CAST(uint32_t *, set); uint64_t __compare = ((uint64_t)_compare[0]) | ((uint64_t)_compare[1] << 32); uint64_t __set = ((uint64_t)_set[0]) | ((uint64_t)_set[1] << 32); return (ck_pr_cas_64_value(CK_CPP_CAST(uint64_t *, target), __compare, __set, CK_CPP_CAST(uint64_t *, value))); } #define CK_PR_DOUBLE_CAS(T, N) \ CK_CC_INLINE static bool \ ck_pr_cas_##N(T *target, T compare, T set) \ { \ int ret; \ T tmp; \ \ __asm__ __volatile__("1:" \ "mov %0, #0;" \ "ldrexd %1, [%4];" \ "cmp %Q1, %Q2;" \ "itttt eq;" \ "cmpeq %R1, %R2;" \ "strexdeq %1, %3, [%4];" \ "moveq %0, #1;" \ "cmpeq %1, #1;" \ "beq 1b;" \ : "=&r" (ret), "=&r" (tmp) \ : "r" (compare), "r" (set) , \ "r"(target) \ : "memory", "cc"); \ \ return (ret); \ } CK_PR_DOUBLE_CAS(uint64_t, 64) #ifndef CK_PR_DISABLE_DOUBLE CK_PR_DOUBLE_CAS(double, double) #endif CK_CC_INLINE static bool ck_pr_cas_ptr_2(void *target, void *compare, void *set) { uint32_t *_compare = CK_CPP_CAST(uint32_t *, compare); uint32_t *_set = CK_CPP_CAST(uint32_t *, set); uint64_t __compare = ((uint64_t)_compare[0]) | ((uint64_t)_compare[1] << 32); uint64_t __set = ((uint64_t)_set[0]) | ((uint64_t)_set[1] << 32); return (ck_pr_cas_64(CK_CPP_CAST(uint64_t *, target), __compare, __set)); } #endif CK_CC_INLINE static bool ck_pr_cas_ptr_value(void *target, void *compare, void *set, void *value) { void *previous, *tmp; __asm__ __volatile__("1:" "ldrex %0, [%2];" "cmp %0, %4;" "itt eq;" "strexeq %1, %3, [%2];" "cmpeq %1, #1;" "beq 1b;" : "=&r" (previous), "=&r" (tmp) : "r" (target), "r" (set), "r" (compare) : "memory", "cc"); *(void **)value = previous; return (previous == compare); } CK_CC_INLINE static bool ck_pr_cas_ptr(void *target, void *compare, void *set) { void *previous, *tmp; __asm__ __volatile__("1:" "ldrex %0, [%2];" "cmp %0, %4;" "itt eq;" "strexeq %1, %3, [%2];" "cmpeq %1, #1;" "beq 1b;" : "=&r" (previous), "=&r" (tmp) : "r" (target), "r" (set), "r" (compare) : "memory", "cc"); return (previous == compare); } #define CK_PR_CAS(N, T, W) \ CK_CC_INLINE static bool \ ck_pr_cas_##N##_value(T *target, T compare, T set, T *value) \ { \ T previous = 0, tmp = 0; \ __asm__ __volatile__("1:" \ "ldrex" W " %0, [%2];" \ "cmp %0, %4;" \ "itt eq;" \ "strex" W "eq %1, %3, [%2];" \ "cmpeq %1, #1;" \ "beq 1b;" \ /* \ * Using "+&" instead of "=&" to avoid bogus \ * clang warnings. \ */ \ : "+&r" (previous), \ "+&r" (tmp) \ : "r" (target), \ "r" (set), \ "r" (compare) \ : "memory", "cc"); \ *value = previous; \ return (previous == compare); \ } \ CK_CC_INLINE static bool \ ck_pr_cas_##N(T *target, T compare, T set) \ { \ T previous = 0, tmp = 0; \ __asm__ __volatile__("1:" \ "ldrex" W " %0, [%2];" \ "cmp %0, %4;" \ "itt eq;" \ "strex" W "eq %1, %3, [%2];" \ "cmpeq %1, #1;" \ "beq 1b;" \ : "+&r" (previous), \ "+&r" (tmp) \ : "r" (target), \ "r" (set), \ "r" (compare) \ : "memory", "cc"); \ return (previous == compare); \ } CK_PR_CAS(32, uint32_t, "") CK_PR_CAS(uint, unsigned int, "") CK_PR_CAS(int, int, "") CK_PR_CAS(16, uint16_t, "h") CK_PR_CAS(8, uint8_t, "b") CK_PR_CAS(short, short, "h") CK_PR_CAS(char, char, "b") #undef CK_PR_CAS #define CK_PR_FAS(N, M, T, W) \ CK_CC_INLINE static T \ ck_pr_fas_##N(M *target, T v) \ { \ T previous = 0; \ T tmp = 0; \ __asm__ __volatile__("1:" \ "ldrex" W " %0, [%2];" \ "strex" W " %1, %3, [%2];" \ "cmp %1, #0;" \ "bne 1b;" \ : "+&r" (previous), \ "+&r" (tmp) \ : "r" (target), \ "r" (v) \ : "memory", "cc"); \ return (previous); \ } CK_PR_FAS(32, uint32_t, uint32_t, "") CK_PR_FAS(ptr, void, void *, "") CK_PR_FAS(int, int, int, "") CK_PR_FAS(uint, unsigned int, unsigned int, "") CK_PR_FAS(16, uint16_t, uint16_t, "h") CK_PR_FAS(8, uint8_t, uint8_t, "b") CK_PR_FAS(short, short, short, "h") CK_PR_FAS(char, char, char, "b") #undef CK_PR_FAS #define CK_PR_UNARY(O, N, M, T, I, W) \ CK_CC_INLINE static void \ ck_pr_##O##_##N(M *target) \ { \ T previous = 0; \ T tmp = 0; \ __asm__ __volatile__("1:" \ "ldrex" W " %0, [%2];" \ I ";" \ "strex" W " %1, %0, [%2];" \ "cmp %1, #0;" \ "bne 1b;" \ : "+&r" (previous), \ "+&r" (tmp) \ : "r" (target) \ : "memory", "cc"); \ return; \ } CK_PR_UNARY(inc, ptr, void, void *, "add %0, %0, #1", "") CK_PR_UNARY(dec, ptr, void, void *, "sub %0, %0, #1", "") CK_PR_UNARY(not, ptr, void, void *, "mvn %0, %0", "") CK_PR_UNARY(neg, ptr, void, void *, "neg %0, %0", "") #define CK_PR_UNARY_S(S, T, W) \ CK_PR_UNARY(inc, S, T, T, "add %0, %0, #1", W) \ CK_PR_UNARY(dec, S, T, T, "sub %0, %0, #1", W) \ CK_PR_UNARY(not, S, T, T, "mvn %0, %0", W) \ CK_PR_UNARY(neg, S, T, T, "neg %0, %0", W) \ CK_PR_UNARY_S(32, uint32_t, "") CK_PR_UNARY_S(uint, unsigned int, "") CK_PR_UNARY_S(int, int, "") CK_PR_UNARY_S(16, uint16_t, "h") CK_PR_UNARY_S(8, uint8_t, "b") CK_PR_UNARY_S(short, short, "h") CK_PR_UNARY_S(char, char, "b") #undef CK_PR_UNARY_S #undef CK_PR_UNARY #define CK_PR_BINARY(O, N, M, T, I, W) \ CK_CC_INLINE static void \ ck_pr_##O##_##N(M *target, T delta) \ { \ T previous = 0; \ T tmp = 0; \ __asm__ __volatile__("1:" \ "ldrex" W " %0, [%2];" \ I " %0, %0, %3;" \ "strex" W " %1, %0, [%2];" \ "cmp %1, #0;" \ "bne 1b;" \ : "+&r" (previous), \ "+&r" (tmp) \ : "r" (target), \ "r" (delta) \ : "memory", "cc"); \ return; \ } CK_PR_BINARY(and, ptr, void, uintptr_t, "and", "") CK_PR_BINARY(add, ptr, void, uintptr_t, "add", "") CK_PR_BINARY(or, ptr, void, uintptr_t, "orr", "") CK_PR_BINARY(sub, ptr, void, uintptr_t, "sub", "") CK_PR_BINARY(xor, ptr, void, uintptr_t, "eor", "") #define CK_PR_BINARY_S(S, T, W) \ CK_PR_BINARY(and, S, T, T, "and", W) \ CK_PR_BINARY(add, S, T, T, "add", W) \ CK_PR_BINARY(or, S, T, T, "orr", W) \ CK_PR_BINARY(sub, S, T, T, "sub", W) \ CK_PR_BINARY(xor, S, T, T, "eor", W) CK_PR_BINARY_S(32, uint32_t, "") CK_PR_BINARY_S(uint, unsigned int, "") CK_PR_BINARY_S(int, int, "") CK_PR_BINARY_S(16, uint16_t, "h") CK_PR_BINARY_S(8, uint8_t, "b") CK_PR_BINARY_S(short, short, "h") CK_PR_BINARY_S(char, char, "b") #undef CK_PR_BINARY_S #undef CK_PR_BINARY CK_CC_INLINE static void * ck_pr_faa_ptr(void *target, uintptr_t delta) { uintptr_t previous, r, tmp; __asm__ __volatile__("1:" "ldrex %0, [%3];" "add %1, %4, %0;" "strex %2, %1, [%3];" "cmp %2, #0;" "bne 1b;" : "=&r" (previous), "=&r" (r), "=&r" (tmp) : "r" (target), "r" (delta) : "memory", "cc"); return (void *)(previous); } #define CK_PR_FAA(S, T, W) \ CK_CC_INLINE static T \ ck_pr_faa_##S(T *target, T delta) \ { \ T previous = 0, r = 0, tmp = 0; \ __asm__ __volatile__("1:" \ "ldrex" W " %0, [%3];" \ "add %1, %4, %0;" \ "strex" W " %2, %1, [%3];" \ "cmp %2, #0;" \ "bne 1b;" \ : "+&r" (previous), \ "+&r" (r), \ "+&r" (tmp) \ : "r" (target), \ "r" (delta) \ : "memory", "cc"); \ return (previous); \ } CK_PR_FAA(32, uint32_t, "") CK_PR_FAA(uint, unsigned int, "") CK_PR_FAA(int, int, "") CK_PR_FAA(16, uint16_t, "h") CK_PR_FAA(8, uint8_t, "b") CK_PR_FAA(short, short, "h") CK_PR_FAA(char, char, "b") #undef CK_PR_FAA #endif /* CK_PR_ARM_H */