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ck/include/gcc/riscv64/ck_pr.h
Daniel Baumann 6df1da3298
Merging upstream version 0.7.2. 
Signed-off-by: Daniel Baumann <daniel@debian.org>
2025-02-09 07:52:24 +01:00

548 lines
14 KiB
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/*
* Copyright 2009-2016 Samy Al Bahra.
* Copyright 2013-2016 Olivier Houchard.
* All rights reserved.
* Copyright 2022 The FreeBSD Foundation.
*
* Portions of this software were developed by Mitchell Horne
* under sponsorship from the FreeBSD Foundation.
*
* 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_RISCV64_H
#define CK_PR_RISCV64_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>
#if !defined(__riscv_xlen) || __riscv_xlen != 64
#error "only for riscv64!"
#endif
/*
* 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;
}
/*
* The FENCE instruction is defined in terms of predecessor and successor bits.
* This allows for greater granularity in specifying whether reads (loads) or
* writes (stores) may pass over either side of the fence.
*
* e.g. "fence r,rw" creates a barrier with acquire semantics.
*
* Note that atomic memory operations (AMOs) are defined by the RISC-V spec to
* act as both a load and store memory operation (read-modify-write, in other
* words). Thus, any of r, w, or rw will enforce ordering on an AMO.
*/
#define CK_FENCE(p, s) __asm __volatile("fence " #p "," #s ::: "memory");
#define CK_FENCE_RW_RW CK_FENCE(rw,rw)
#define CK_PR_FENCE(T, I) \
CK_CC_INLINE static void \
ck_pr_fence_strict_##T(void) \
{ \
I; \
}
CK_PR_FENCE(atomic, CK_FENCE_RW_RW)
CK_PR_FENCE(atomic_store, CK_FENCE(rw,w))
CK_PR_FENCE(atomic_load, CK_FENCE(rw,r))
CK_PR_FENCE(store_atomic, CK_FENCE(w,rw))
CK_PR_FENCE(load_atomic, CK_FENCE(r,rw))
CK_PR_FENCE(store, CK_FENCE(w,w))
CK_PR_FENCE(store_load, CK_FENCE(w,r))
CK_PR_FENCE(load, CK_FENCE(r,r))
CK_PR_FENCE(load_store, CK_FENCE(r,w))
CK_PR_FENCE(memory, CK_FENCE_RW_RW)
CK_PR_FENCE(acquire, CK_FENCE(r,rw))
CK_PR_FENCE(release, CK_FENCE(rw,w))
CK_PR_FENCE(acqrel, CK_FENCE_RW_RW)
CK_PR_FENCE(lock, CK_FENCE_RW_RW)
CK_PR_FENCE(unlock, CK_FENCE_RW_RW)
#undef CK_PR_FENCE
#undef CK_FENCE_RW_RW
#undef CK_FENCE
/*
* ck_pr_load(3)
*/
#define CK_PR_LOAD(S, M, T, I) \
CK_CC_INLINE static T \
ck_pr_md_load_##S(const M *target) \
{ \
long r = 0; \
__asm__ __volatile__(I " %0, 0(%1)\n" \
: "=r" (r) \
: "r" (target) \
: "memory"); \
return ((T)r); \
}
#define CK_PR_LOAD_S(S, T, I) CK_PR_LOAD(S, T, T, I)
CK_PR_LOAD(ptr, void, void *, "ld")
CK_PR_LOAD_S(64, uint64_t, "ld")
CK_PR_LOAD_S(32, uint32_t, "lwu")
CK_PR_LOAD_S(16, uint16_t, "lhu")
CK_PR_LOAD_S(8, uint8_t, "lbu")
CK_PR_LOAD_S(uint, unsigned int, "lwu")
CK_PR_LOAD_S(int, int, "lw")
CK_PR_LOAD_S(short, short, "lh")
CK_PR_LOAD_S(char, char, "lb")
#ifndef CK_PR_DISABLE_DOUBLE
CK_PR_LOAD_S(double, double, "ld")
#endif
#undef CK_PR_LOAD_S
#undef CK_PR_LOAD
/*
* ck_pr_store(3)
*/
#define CK_PR_STORE(S, M, T, I) \
CK_CC_INLINE static void \
ck_pr_md_store_##S(M *target, T val) \
{ \
__asm__ __volatile__(I " %1, 0(%0)" \
: \
: "r" (target), \
"r" (val) \
: "memory"); \
}
#define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, I)
CK_PR_STORE(ptr, void, const void *, "sd")
CK_PR_STORE_S(64, uint64_t, "sd")
CK_PR_STORE_S(32, uint32_t, "sw")
CK_PR_STORE_S(16, uint16_t, "sh")
CK_PR_STORE_S(8, uint8_t, "sb")
CK_PR_STORE_S(uint, unsigned int, "sw")
CK_PR_STORE_S(int, int, "sw")
CK_PR_STORE_S(short, short, "sh")
CK_PR_STORE_S(char, char, "sb")
#ifndef CK_PR_DISABLE_DOUBLE
CK_PR_STORE_S(double, double, "sd")
#endif
#undef CK_PR_STORE_S
#undef CK_PR_STORE
/*
* ck_pr_cas(3)
*
* NB: 'S' is to cast compare to a signed 32-bit integer, so the value will be
* sign-extended when passed to inline asm. GCC does this sign extension
* implicitly, while clang does not. It is necessary because lr.w sign-extends
* the value read from memory, so compare must match that to avoid looping
* unconditionally.
*/
#define CK_PR_CAS(N, M, T, C, S, W) \
CK_CC_INLINE static bool \
ck_pr_cas_##N##_value(M *target, T compare, T set, M *value) \
{ \
T previous; \
int tmp; \
__asm__ __volatile__("1:" \
"li %[tmp], 1\n" \
"lr." W " %[p], %[t]\n" \
"bne %[p], %[c], 2f\n" \
"sc." W " %[tmp], %[s], %[t]\n" \
"bnez %[tmp], 1b\n" \
"2:" \
: [p]"=&r" (previous), \
[tmp]"=&r" (tmp), \
[t]"+A" (*(C *)target) \
: [s]"r" (set), \
[c]"r" ((long)(S)compare) \
: "memory"); \
*(T *)value = previous; \
return (tmp == 0); \
} \
CK_CC_INLINE static bool \
ck_pr_cas_##N(M *target, T compare, T set) \
{ \
T previous; \
int tmp; \
__asm__ __volatile__("1:" \
"li %[tmp], 1\n" \
"lr." W " %[p], %[t]\n" \
"bne %[p], %[c], 2f\n" \
"sc." W " %[tmp], %[s], %[t]\n" \
"bnez %[tmp], 1b\n" \
"2:" \
: [p]"=&r" (previous), \
[tmp]"=&r" (tmp), \
[t]"+A" (*(C *)target) \
: [s]"r" (set), \
[c]"r" ((long)(S)compare) \
: "memory"); \
return (tmp == 0); \
}
#define CK_PR_CAS_S(N, T, W) CK_PR_CAS(N, T, T, T, T, W)
#define CK_PR_CAS_32_S(N, T, W) CK_PR_CAS(N, T, T, T, int32_t, W)
CK_PR_CAS(ptr, void, void *, uint64_t, uint64_t, "d")
CK_PR_CAS_S(64, uint64_t, "d")
CK_PR_CAS_32_S(32, uint32_t, "w")
CK_PR_CAS_32_S(uint, unsigned int, "w")
CK_PR_CAS_32_S(int, int, "w")
#ifndef CK_PR_DISABLE_DOUBLE
CK_PR_CAS_S(double, double, "d")
#endif
#undef CK_PR_CAS_S
#undef CK_PR_CAS
/*
* ck_pr_faa(3)
*/
#define CK_PR_FAA(N, M, T, C, W) \
CK_CC_INLINE static T \
ck_pr_faa_##N(M *target, T delta) \
{ \
T previous; \
__asm__ __volatile__("amoadd." W " %0, %2, %1\n" \
: "=&r" (previous), \
"+A" (*(C *)target) \
: "r" (delta) \
: "memory"); \
return (previous); \
}
#define CK_PR_FAA_S(N, T, W) CK_PR_FAA(N, T, T, T, W)
CK_PR_FAA(ptr, void, void *, uint64_t, "d")
CK_PR_FAA_S(64, uint64_t, "d")
CK_PR_FAA_S(32, uint32_t, "w")
CK_PR_FAA_S(uint, unsigned int, "w")
CK_PR_FAA_S(int, int, "w")
#undef CK_PR_FAA_S
#undef CK_PR_FAA
/*
* ck_pr_fas(3)
*/
#define CK_PR_FAS(N, M, T, C, W) \
CK_CC_INLINE static T \
ck_pr_fas_##N(M *target, T val) \
{ \
T previous; \
__asm__ __volatile__("amoswap." W " %0, %2, %1\n" \
: "=&r" (previous), \
"+A" (*(C *)target) \
: "r" (val) \
: "memory"); \
return (previous); \
}
#define CK_PR_FAS_S(N, T, W) CK_PR_FAS(N, T, T, T, W)
CK_PR_FAS(ptr, void, void *, uint64_t, "d")
CK_PR_FAS_S(64, uint64_t, "d")
CK_PR_FAS_S(32, uint32_t, "w")
CK_PR_FAS_S(int, int, "w")
CK_PR_FAS_S(uint, unsigned int, "w")
#undef CK_PR_FAS_S
#undef CK_PR_FAS
/*
* ck_pr_add(3)
*/
#define CK_PR_ADD(N, M, T, C, W) \
CK_CC_INLINE static void \
ck_pr_add_##N(M *target, T val) \
{ \
__asm__ __volatile__("amoadd." W " zero, %1, %0\n" \
: "+A" (*(C *)target) \
: "r" (val) \
: "memory"); \
} \
CK_CC_INLINE static bool \
ck_pr_add_##N##_is_zero(M *target, T val) \
{ \
T previous; \
__asm__ __volatile__("amoadd." W " %0, %2, %1\n" \
: "=&r" (previous), \
"+A" (*(C *)target) \
: "r" (val) \
: "memory"); \
return (((C)previous + (C)val) == 0); \
}
#define CK_PR_ADD_S(N, T, W) CK_PR_ADD(N, T, T, T, W)
CK_PR_ADD(ptr, void, void *, uint64_t, "d")
CK_PR_ADD_S(64, uint64_t, "d")
CK_PR_ADD_S(32, uint32_t, "w")
CK_PR_ADD_S(uint, unsigned int, "w")
CK_PR_ADD_S(int, int, "w")
#undef CK_PR_ADD_S
#undef CK_PR_ADD
/*
* ck_pr_inc(3)
*
* Implemented in terms of ck_pr_add(3); RISC-V has no atomic inc or dec
* instructions.
*/
#define CK_PR_INC(N, M, T, W) \
CK_CC_INLINE static void \
ck_pr_inc_##N(M *target) \
{ \
ck_pr_add_##N(target, (T)1); \
} \
CK_CC_INLINE static bool \
ck_pr_inc_##N##_is_zero(M *target) \
{ \
return (ck_pr_add_##N##_is_zero(target, (T)1)); \
}
#define CK_PR_INC_S(N, T, W) CK_PR_INC(N, T, T, W)
CK_PR_INC(ptr, void, void *, "d")
CK_PR_INC_S(64, uint64_t, "d")
CK_PR_INC_S(32, uint32_t, "w")
CK_PR_INC_S(uint, unsigned int, "w")
CK_PR_INC_S(int, int, "w")
#undef CK_PR_INC_S
#undef CK_PR_INC
/*
* ck_pr_sub(3)
*/
#define CK_PR_SUB(N, M, T, C, W) \
CK_CC_INLINE static void \
ck_pr_sub_##N(M *target, T val) \
{ \
__asm__ __volatile__("amoadd." W " zero, %1, %0\n" \
: "+A" (*(C *)target) \
: "r" (-(C)val) \
: "memory"); \
} \
CK_CC_INLINE static bool \
ck_pr_sub_##N##_is_zero(M *target, T val) \
{ \
T previous; \
__asm__ __volatile__("amoadd." W " %0, %2, %1\n" \
: "=&r" (previous), \
"+A" (*(C *)target) \
: "r" (-(C)val) \
: "memory"); \
return (((C)previous - (C)val) == 0); \
}
#define CK_PR_SUB_S(N, T, W) CK_PR_SUB(N, T, T, T, W)
CK_PR_SUB(ptr, void, void *, uint64_t, "d")
CK_PR_SUB_S(64, uint64_t, "d")
CK_PR_SUB_S(32, uint32_t, "w")
CK_PR_SUB_S(uint, unsigned int, "w")
CK_PR_SUB_S(int, int, "w")
#undef CK_PR_SUB_S
#undef CK_PR_SUB
/*
* ck_pr_dec(3)
*/
#define CK_PR_DEC(N, M, T, W) \
CK_CC_INLINE static void \
ck_pr_dec_##N(M *target) \
{ \
ck_pr_sub_##N(target, (T)1); \
} \
CK_CC_INLINE static bool \
ck_pr_dec_##N##_is_zero(M *target) \
{ \
return (ck_pr_sub_##N##_is_zero(target, (T)1)); \
}
#define CK_PR_DEC_S(N, T, W) CK_PR_DEC(N, T, T, W)
CK_PR_DEC(ptr, void, void *, "d")
CK_PR_DEC_S(64, uint64_t, "d")
CK_PR_DEC_S(32, uint32_t, "w")
CK_PR_DEC_S(uint, unsigned int, "w")
CK_PR_DEC_S(int, int, "w")
#undef CK_PR_DEC_S
#undef CK_PR_DEC
/*
* ck_pr_neg(3)
*/
#define CK_PR_NEG(N, M, T, C, W) \
CK_CC_INLINE static void \
ck_pr_neg_##N(M *target) \
{ \
__asm__ __volatile__("1:" \
"lr." W " t0, %0\n" \
"sub t0, zero, t0\n" \
"sc." W " t1, t0, %0\n" \
"bnez t1, 1b\n" \
: "+A" (*(C *)target) \
: \
: "t0", "t1", "memory"); \
}
#define CK_PR_NEG_S(N, T, W) CK_PR_NEG(N, T, T, T, W)
CK_PR_NEG(ptr, void, void *, uint64_t, "d")
CK_PR_NEG_S(64, uint64_t, "d")
CK_PR_NEG_S(32, uint32_t, "w")
CK_PR_NEG_S(uint, unsigned int, "w")
CK_PR_NEG_S(int, int, "w")
#undef CK_PR_NEG_S
#undef CK_PR_NEG
/*
* ck_pr_not(3)
*/
#define CK_PR_NOT(N, M, T, C, W) \
CK_CC_INLINE static void \
ck_pr_not_##N(M *target) \
{ \
__asm__ __volatile__("1:" \
"lr." W " t0, %0\n" \
"not t0, t0\n" \
"sc." W " t1, t0, %0\n" \
"bnez t1, 1b\n" \
: "+A" (*(C *)target) \
: \
: "t0", "t1", "memory"); \
}
#define CK_PR_NOT_S(N, T, W) CK_PR_NOT(N, T, T, T, W)
CK_PR_NOT(ptr, void, void *, uint64_t, "d")
CK_PR_NOT_S(64, uint64_t, "d")
CK_PR_NOT_S(32, uint32_t, "w")
CK_PR_NOT_S(uint, unsigned int, "w")
CK_PR_NOT_S(int, int, "w")
#undef CK_PR_NOT_S
#undef CK_PR_NOT
/*
* ck_pr_and(3), ck_pr_or(3), and ck_pr_xor(3)
*/
#define CK_PR_BINARY(O, N, M, T, C, I, W) \
CK_CC_INLINE static void \
ck_pr_##O##_##N(M *target, T delta) \
{ \
__asm__ __volatile__(I "." W " zero, %1, %0\n" \
: "+A" (*(C *)target) \
: "r" (delta) \
: "memory"); \
}
CK_PR_BINARY(and, ptr, void, void *, uint64_t, "amoand", "d")
CK_PR_BINARY(or, ptr, void, void *, uint64_t, "amoor", "d")
CK_PR_BINARY(xor, ptr, void, void *, uint64_t, "amoxor", "d")
#define CK_PR_BINARY_S(S, T, W) \
CK_PR_BINARY(and, S, T, T, T, "amoand", W) \
CK_PR_BINARY(or, S, T, T, T, "amoor", W) \
CK_PR_BINARY(xor, S, T, T, T, "amoxor", W) \
CK_PR_BINARY_S(64, uint64_t, "d")
CK_PR_BINARY_S(32, uint32_t, "w")
CK_PR_BINARY_S(uint, unsigned int, "w")
CK_PR_BINARY_S(int, int, "w")
#undef CK_PR_BINARY_S
#undef CK_PR_BINARY
/*
* ck_pr_btc(3), ck_pr_btr(3), and ck_pr_bts(3)
*/
#define CK_PR_BTX(K, S, I, W, M, C, O) \
CK_CC_INLINE static bool \
ck_pr_##K##_##S(M *target, unsigned int idx) \
{ \
C ret; \
C mask = (C)0x1 << idx; \
__asm__ __volatile__(I "." W " %1, %2, %0\n" \
: "+A" (*(C *)target), \
"=r" (ret) \
: "r" (O(mask)) \
: "memory", "cc"); \
return ((ret & mask) != 0); \
}
#define CK_PR_BTC(S, W, M, C) CK_PR_BTX(btc, S, "amoxor", W, M, C, 0+)
#define CK_PR_BTC_S(S, W, T) CK_PR_BTC(S, W, T, T)
CK_PR_BTC(ptr, "d", void, uint64_t)
CK_PR_BTC_S(64, "d", uint64_t)
CK_PR_BTC_S(32, "w", uint32_t)
CK_PR_BTC_S(uint, "w", unsigned int)
CK_PR_BTC_S(int, "w", int)
#undef CK_PR_BTC_S
#undef CK_PR_BTC
#define CK_PR_BTR(S, W, M, C) CK_PR_BTX(btr, S, "amoand", W, M, C, ~)
#define CK_PR_BTR_S(S, W, T) CK_PR_BTR(S, W, T, T)
CK_PR_BTR(ptr, "d", void, uint64_t)
CK_PR_BTR_S(64, "d", uint64_t)
CK_PR_BTR_S(32, "w", uint32_t)
CK_PR_BTR_S(uint, "w", unsigned int)
CK_PR_BTR_S(int, "w", int)
#undef CK_PR_BTR_S
#undef CK_PR_BTR
#define CK_PR_BTS(S, W, M, C) CK_PR_BTX(bts, S, "amoor", W, M, C, 0+)
#define CK_PR_BTS_S(S, W, T) CK_PR_BTS(S, W, T, T)
CK_PR_BTS(ptr, "d", void, uint64_t)
CK_PR_BTS_S(64, "d", uint64_t)
CK_PR_BTS_S(32, "w", uint32_t)
CK_PR_BTS_S(uint, "w", unsigned int)
CK_PR_BTS_S(int, "w", int)
#undef CK_PR_BTS_S
#undef CK_PR_BTS
#undef CK_PR_BTX
#endif /* CK_PR_RISCV64_H */
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