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517 lines
14 KiB
517 lines
14 KiB
/*
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* Copyright 2009-2014 Samy Al Bahra.
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* Copyright 2013-2014 Olivier Houchard.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _CK_PR_ARM_H
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#define _CK_PR_ARM_H
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#ifndef _CK_PR_H
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#error Do not include this file directly, use ck_pr.h
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#endif
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#include <ck_cc.h>
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#include <ck_md.h>
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/*
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* The following represent supported atomic operations.
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* These operations may be emulated.
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*/
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#include "ck_f_pr.h"
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/*
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* Minimum interface requirement met.
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*/
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#define CK_F_PR
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CK_CC_INLINE static void
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ck_pr_stall(void)
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{
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__asm__ __volatile__("" ::: "memory");
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return;
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}
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#if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__)
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#define __CK_ISB __asm __volatile("isb" : : "r" (0) : "memory")
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#define _CK_DMB __asm __volatile("dmb" : : "r" (0) : "memory")
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#define _CK_DSB __asm __volatile("dsb" : : "r" (0) : "memory")
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/* FreeBSD's toolchain doesn't accept dmb st, so use the opcode instead */
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#ifdef __FreeBSD__
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#define _CK_DMB_ST __asm __volatile(".word 0xf57ff05e" : : "r" (0) : "memory")
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#else
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#define _CK_DMB_ST __asm __volatile("dmb st" : : "r" (0) : "memory")
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#endif /* __FreeBSD__ */
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#else
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/* armv6 doesn't have dsb/dmb/isb, and no way to wait only for stores */
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#define _CK_ISB \
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__asm __volatile("mcr p15, 0, %0, c7, c5, 4" : : "r" (0) : "memory")
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#define _CK_DSB \
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__asm __volatile("mcr p15, 0, %0, c7, c10, 4" : : "r" (0) : "memory")
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#define _CK_DMB \
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__asm __volatile("mcr p15, 0, %0, c7, c10, 5" : : "r" (0) : "memory")
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#define _CK_DMB_ST _CK_DMB
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#endif
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#define CK_PR_FENCE(T, I) \
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CK_CC_INLINE static void \
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ck_pr_fence_strict_##T(void) \
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{ \
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I; \
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}
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CK_PR_FENCE(atomic, _CK_DMB_ST)
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CK_PR_FENCE(atomic_store, _CK_DMB_ST)
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CK_PR_FENCE(atomic_load, _CK_DMB_ST)
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CK_PR_FENCE(store_atomic, _CK_DMB_ST)
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CK_PR_FENCE(load_atomic, _CK_DMB)
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CK_PR_FENCE(store, _CK_DMB_ST)
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CK_PR_FENCE(store_load, _CK_DMB_ST)
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CK_PR_FENCE(load, _CK_DMB)
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CK_PR_FENCE(load_store, _CK_DMB)
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CK_PR_FENCE(memory, _CK_DMB)
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CK_PR_FENCE(acquire, _CK_DMB)
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CK_PR_FENCE(release, _CK_DMB)
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#undef CK_PR_FENCE
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#undef _CK_ISB
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#undef _CK_DSB
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#undef _CK_DMB
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#undef _CK_DMB_ST
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#define CK_PR_LOAD(S, M, T, C, I) \
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CK_CC_INLINE static T \
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ck_pr_load_##S(const M *target) \
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{ \
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long r = 0; \
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__asm__ __volatile__(I " %0, [%1];" \
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: "=r" (r) \
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: "r" (target) \
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: "memory"); \
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return ((T)r); \
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}
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CK_PR_LOAD(ptr, void, void *, uint32_t, "ldr")
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#define CK_PR_LOAD_S(S, T, I) CK_PR_LOAD(S, T, T, T, I)
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CK_PR_LOAD_S(32, uint32_t, "ldr")
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CK_PR_LOAD_S(16, uint16_t, "ldrh")
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CK_PR_LOAD_S(8, uint8_t, "ldrb")
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CK_PR_LOAD_S(uint, unsigned int, "ldr")
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CK_PR_LOAD_S(int, int, "ldr")
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CK_PR_LOAD_S(short, short, "ldrh")
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CK_PR_LOAD_S(char, char, "ldrb")
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#undef CK_PR_LOAD_S
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#undef CK_PR_LOAD
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CK_CC_INLINE static uint64_t
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ck_pr_load_64(const uint64_t *target)
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{
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register uint64_t ret asm("r0");
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__asm __volatile("ldrd %0, [%1]" : "+r" (ret)
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: "r" (target)
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: "memory", "cc");
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return (ret);
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}
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#define CK_PR_STORE(S, M, T, C, I) \
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CK_CC_INLINE static void \
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ck_pr_store_##S(M *target, T v) \
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{ \
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__asm__ __volatile__(I " %1, [%0]" \
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: \
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: "r" (target), \
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"r" (v) \
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: "memory"); \
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return; \
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}
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CK_PR_STORE(ptr, void, const void *, uint32_t, "str")
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#define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I)
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CK_PR_STORE_S(32, uint32_t, "str")
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CK_PR_STORE_S(16, uint16_t, "strh")
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CK_PR_STORE_S(8, uint8_t, "strb")
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CK_PR_STORE_S(uint, unsigned int, "str")
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CK_PR_STORE_S(int, int, "str")
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CK_PR_STORE_S(short, short, "strh")
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CK_PR_STORE_S(char, char, "strb")
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#undef CK_PR_STORE_S
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#undef CK_PR_STORE
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CK_CC_INLINE static void
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ck_pr_store_64(const uint64_t *target, uint64_t value)
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{
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register uint64_t tmp asm("r0") = value;
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__asm __volatile("strd %0, [%1]"
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:
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: "r" (tmp), "r" (target)
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: "memory", "cc");
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}
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CK_CC_INLINE static bool
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ck_pr_cas_64_value(uint64_t *target, uint64_t compare, uint64_t set, uint64_t *value)
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{
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register uint64_t __compare asm("r0") = compare;
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register uint64_t __set asm("r2") = set;
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__asm__ __volatile__("1:"
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"ldrexd r4, [%3];"
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"cmp r4, r0;"
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"ittt eq;"
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"cmpeq r5, r1;"
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"strexdeq r6, r2, [%3];"
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"cmpeq r6, #1;"
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"beq 1b;"
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"strd r4, [%0];"
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: "+r" (value)
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: "r" (__compare), "r" (__set) ,
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"r"(target)
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: "memory", "cc", "r4", "r5", "r6");
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return (*value == compare);
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}
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CK_CC_INLINE static bool
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ck_pr_cas_ptr_2_value(void *target, void *compare, void *set, void *value)
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{
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uint32_t *_compare = compare;
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uint32_t *_set = set;
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uint64_t __compare = ((uint64_t)_compare[0]) | ((uint64_t)_compare[1] << 32);
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uint64_t __set = ((uint64_t)_set[0]) | ((uint64_t)_set[1] << 32);
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return (ck_pr_cas_64_value(target, __compare, __set, value));
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}
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CK_CC_INLINE static bool
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ck_pr_cas_64(uint64_t *target, uint64_t compare, uint64_t set)
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{
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register uint64_t __compare asm("r0") = compare;
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register uint64_t __set asm("r2") = set;
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int ret;
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__asm__ __volatile__("1:"
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"mov %0, #0;"
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"ldrexd r4, [%3];"
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"cmp r4, r0;"
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"itttt eq;"
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"cmpeq r5, r1;"
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"strexdeq r6, r2, [%3];"
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"moveq %0, #1;"
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"cmpeq r6, #1;"
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"beq 1b;"
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: "=&r" (ret)
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: "r" (__compare), "r" (__set) ,
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"r"(target)
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: "memory", "cc", "r4", "r5", "r6");
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return (ret);
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}
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CK_CC_INLINE static bool
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ck_pr_cas_ptr_2(void *target, void *compare, void *set)
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{
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uint32_t *_compare = compare;
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uint32_t *_set = set;
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uint64_t __compare = ((uint64_t)_compare[0]) | ((uint64_t)_compare[1] << 32);
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uint64_t __set = ((uint64_t)_set[0]) | ((uint64_t)_set[1] << 32);
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return (ck_pr_cas_64(target, __compare, __set));
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}
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CK_CC_INLINE static bool
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ck_pr_cas_ptr_value(void *target, void *compare, void *set, void *value)
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{
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void *previous, *tmp;
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__asm__ __volatile__("1:"
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"ldrex %0, [%2];"
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"cmp %0, %4;"
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"itt eq;"
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"strexeq %1, %3, [%2];"
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"cmpeq %1, #1;"
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"beq 1b;"
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: "=&r" (previous),
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"=&r" (tmp)
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: "r" (target),
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"r" (set),
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"r" (compare)
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: "memory", "cc");
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*(void **)value = previous;
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return (previous == compare);
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}
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CK_CC_INLINE static bool
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ck_pr_cas_ptr(void *target, void *compare, void *set)
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{
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void *previous, *tmp;
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__asm__ __volatile__("1:"
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"ldrex %0, [%2];"
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"cmp %0, %4;"
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"itt eq;"
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"strexeq %1, %3, [%2];"
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"cmpeq %1, #1;"
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"beq 1b;"
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: "=&r" (previous),
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"=&r" (tmp)
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: "r" (target),
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"r" (set),
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"r" (compare)
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: "memory", "cc");
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return (previous == compare);
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}
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#define CK_PR_CAS(N, T, W) \
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CK_CC_INLINE static bool \
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ck_pr_cas_##N##_value(T *target, T compare, T set, T *value) \
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{ \
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T previous = 0, tmp = 0; \
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__asm__ __volatile__("1:" \
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"ldrex" W " %0, [%2];" \
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"cmp %0, %4;" \
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"itt eq;" \
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"strex" W "eq %1, %3, [%2];" \
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"cmpeq %1, #1;" \
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"beq 1b;" \
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/* \
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* Using "+&" instead of "=&" to avoid bogus \
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* clang warnings. \
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*/ \
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: "+&r" (previous), \
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"+&r" (tmp) \
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: "r" (target), \
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"r" (set), \
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"r" (compare) \
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: "memory", "cc"); \
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*value = previous; \
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return (previous == compare); \
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} \
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CK_CC_INLINE static bool \
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ck_pr_cas_##N(T *target, T compare, T set) \
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{ \
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T previous = 0, tmp = 0; \
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__asm__ __volatile__("1:" \
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"ldrex" W " %0, [%2];" \
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"cmp %0, %4;" \
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"itt eq;" \
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"strex" W "eq %1, %3, [%2];" \
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"cmpeq %1, #1;" \
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"beq 1b;" \
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: "+&r" (previous), \
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"+&r" (tmp) \
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: "r" (target), \
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"r" (set), \
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"r" (compare) \
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: "memory", "cc"); \
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return (previous == compare); \
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}
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CK_PR_CAS(32, uint32_t, "")
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CK_PR_CAS(uint, unsigned int, "")
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CK_PR_CAS(int, int, "")
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CK_PR_CAS(16, uint16_t, "h")
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CK_PR_CAS(8, uint8_t, "b")
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CK_PR_CAS(short, short, "h")
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CK_PR_CAS(char, char, "b")
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#undef CK_PR_CAS_S
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#undef CK_PR_CAS
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#define CK_PR_FAS(N, M, T, W) \
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CK_CC_INLINE static T \
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ck_pr_fas_##N(M *target, T v) \
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{ \
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T previous = 0; \
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T tmp = 0; \
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__asm__ __volatile__("1:" \
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"ldrex" W " %0, [%2];" \
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"strex" W " %1, %3, [%2];" \
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"cmp %1, #0;" \
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"bne 1b;" \
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: "+&r" (previous), \
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"+&r" (tmp) \
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: "r" (target), \
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"r" (v) \
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: "memory", "cc"); \
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return (previous); \
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}
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CK_PR_FAS(32, uint32_t, uint32_t, "")
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CK_PR_FAS(ptr, void, void *, "")
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CK_PR_FAS(int, int, int, "")
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CK_PR_FAS(uint, unsigned int, unsigned int, "")
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CK_PR_FAS(16, uint16_t, uint16_t, "h")
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CK_PR_FAS(8, uint8_t, uint8_t, "b")
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CK_PR_FAS(short, short, short, "h")
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CK_PR_FAS(char, char, char, "b")
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#undef CK_PR_FAS
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#define CK_PR_UNARY(O, N, M, T, I, W) \
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CK_CC_INLINE static void \
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ck_pr_##O##_##N(M *target) \
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{ \
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T previous = 0; \
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T tmp = 0; \
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__asm__ __volatile__("1:" \
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"ldrex" W " %0, [%2];" \
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I ";" \
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"strex" W " %1, %0, [%2];" \
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"cmp %1, #0;" \
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"bne 1b;" \
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: "+&r" (previous), \
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"+&r" (tmp) \
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: "r" (target) \
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: "memory", "cc"); \
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return; \
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}
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CK_PR_UNARY(inc, ptr, void, void *, "add %0, %0, #1", "")
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CK_PR_UNARY(dec, ptr, void, void *, "sub %0, %0, #1", "")
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CK_PR_UNARY(not, ptr, void, void *, "mvn %0, %0", "")
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CK_PR_UNARY(neg, ptr, void, void *, "neg %0, %0", "")
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#define CK_PR_UNARY_S(S, T, W) \
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CK_PR_UNARY(inc, S, T, T, "add %0, %0, #1", W) \
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CK_PR_UNARY(dec, S, T, T, "sub %0, %0, #1", W) \
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CK_PR_UNARY(not, S, T, T, "mvn %0, %0", W) \
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CK_PR_UNARY(neg, S, T, T, "neg %0, %0", W) \
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CK_PR_UNARY_S(32, uint32_t, "")
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CK_PR_UNARY_S(uint, unsigned int, "")
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CK_PR_UNARY_S(int, int, "")
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CK_PR_UNARY_S(16, uint16_t, "h")
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CK_PR_UNARY_S(8, uint8_t, "b")
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CK_PR_UNARY_S(short, short, "h")
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CK_PR_UNARY_S(char, char, "b")
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#undef CK_PR_UNARY_S
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#undef CK_PR_UNARY
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#define CK_PR_BINARY(O, N, M, T, I, W) \
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CK_CC_INLINE static void \
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ck_pr_##O##_##N(M *target, T delta) \
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{ \
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T previous = 0; \
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T tmp = 0; \
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__asm__ __volatile__("1:" \
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"ldrex" W " %0, [%2];" \
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I " %0, %0, %3;" \
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"strex" W " %1, %0, [%2];" \
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"cmp %1, #0;" \
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"bne 1b;" \
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: "+&r" (previous), \
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"+&r" (tmp) \
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: "r" (target), \
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"r" (delta) \
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: "memory", "cc"); \
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return; \
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}
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CK_PR_BINARY(and, ptr, void, uintptr_t, "and", "")
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CK_PR_BINARY(add, ptr, void, uintptr_t, "add", "")
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CK_PR_BINARY(or, ptr, void, uintptr_t, "orr", "")
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CK_PR_BINARY(sub, ptr, void, uintptr_t, "sub", "")
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CK_PR_BINARY(xor, ptr, void, uintptr_t, "eor", "")
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#define CK_PR_BINARY_S(S, T, W) \
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CK_PR_BINARY(and, S, T, T, "and", W) \
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CK_PR_BINARY(add, S, T, T, "add", W) \
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CK_PR_BINARY(or, S, T, T, "orr", W) \
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CK_PR_BINARY(sub, S, T, T, "sub", W) \
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CK_PR_BINARY(xor, S, T, T, "eor", W)
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CK_PR_BINARY_S(32, uint32_t, "")
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CK_PR_BINARY_S(uint, unsigned int, "")
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CK_PR_BINARY_S(int, int, "")
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CK_PR_BINARY_S(16, uint16_t, "h")
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CK_PR_BINARY_S(8, uint8_t, "b")
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CK_PR_BINARY_S(short, short, "h")
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CK_PR_BINARY_S(char, char, "b")
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#undef CK_PR_BINARY_S
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#undef CK_PR_BINARY
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CK_CC_INLINE static void *
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ck_pr_faa_ptr(void *target, uintptr_t delta)
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{
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uintptr_t previous, r, tmp;
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__asm__ __volatile__("1:"
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"ldrex %0, [%3];"
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"add %1, %4, %0;"
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"strex %2, %1, [%3];"
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"cmp %2, #0;"
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"bne 1b;"
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: "=&r" (previous),
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"=&r" (r),
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"=&r" (tmp)
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: "r" (target),
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"r" (delta)
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: "memory", "cc");
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return (void *)(previous);
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}
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#define CK_PR_FAA(S, T, W) \
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CK_CC_INLINE static T \
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ck_pr_faa_##S(T *target, T delta) \
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{ \
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T previous = 0, r = 0, tmp = 0; \
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__asm__ __volatile__("1:" \
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"ldrex" W " %0, [%3];" \
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"add %1, %4, %0;" \
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"strex" W " %2, %1, [%3];" \
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"cmp %2, #0;" \
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"bne 1b;" \
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: "+&r" (previous), \
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"+&r" (r), \
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"+&r" (tmp) \
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: "r" (target), \
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"r" (delta) \
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: "memory", "cc"); \
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return (previous); \
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}
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CK_PR_FAA(32, uint32_t, "")
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CK_PR_FAA(uint, unsigned int, "")
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CK_PR_FAA(int, int, "")
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CK_PR_FAA(16, uint16_t, "h")
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CK_PR_FAA(8, uint8_t, "b")
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CK_PR_FAA(short, short, "h")
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CK_PR_FAA(char, char, "b")
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#undef CK_PR_FAA
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#endif /* _CK_PR_ARM_H */
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