/*
* 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 <ck_cc.h>
#include <ck_md.h>
/*
* 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 */