mirror of
https://github.com/xemu-project/xemu.git
synced 2026-07-11 01:24:41 +02:00
Richard Henderson
ff633bc5d5
The tmp[lh] variables were defined as inputs to the asm rather than outputs, which meant that the compiler rightly diagnosed uninitialized inputs. Reported-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
/*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
* Compare-and-swap for 128-bit atomic operations, AArch64 version.
|
|
*
|
|
* Copyright (C) 2018, 2023 Linaro, Ltd.
|
|
*
|
|
* See docs/devel/atomics.rst for discussion about the guarantees each
|
|
* atomic primitive is meant to provide.
|
|
*/
|
|
|
|
#ifndef AARCH64_ATOMIC128_CAS_H
|
|
#define AARCH64_ATOMIC128_CAS_H
|
|
|
|
/* Through gcc 10, aarch64 has no support for 128-bit atomics. */
|
|
#if defined(CONFIG_ATOMIC128) || defined(CONFIG_CMPXCHG128)
|
|
#include "host/include/generic/host/atomic128-cas.h.inc"
|
|
#else
|
|
static inline Int128 atomic16_cmpxchg(Int128 *ptr, Int128 cmp, Int128 new)
|
|
{
|
|
uint64_t cmpl = int128_getlo(cmp), cmph = int128_gethi(cmp);
|
|
uint64_t newl = int128_getlo(new), newh = int128_gethi(new);
|
|
uint64_t oldl, oldh;
|
|
uint32_t tmp;
|
|
|
|
asm("0: ldaxp %[oldl], %[oldh], %[mem]\n\t"
|
|
"cmp %[oldl], %[cmpl]\n\t"
|
|
"ccmp %[oldh], %[cmph], #0, eq\n\t"
|
|
"b.ne 1f\n\t"
|
|
"stlxp %w[tmp], %[newl], %[newh], %[mem]\n\t"
|
|
"cbnz %w[tmp], 0b\n"
|
|
"1:"
|
|
: [mem] "+m"(*ptr), [tmp] "=&r"(tmp),
|
|
[oldl] "=&r"(oldl), [oldh] "=&r"(oldh)
|
|
: [cmpl] "r"(cmpl), [cmph] "r"(cmph),
|
|
[newl] "r"(newl), [newh] "r"(newh)
|
|
: "memory", "cc");
|
|
|
|
return int128_make128(oldl, oldh);
|
|
}
|
|
|
|
static inline Int128 atomic16_xchg(Int128 *ptr, Int128 new)
|
|
{
|
|
uint64_t newl = int128_getlo(new), newh = int128_gethi(new);
|
|
uint64_t oldl, oldh;
|
|
uint32_t tmp;
|
|
|
|
asm("0: ldaxp %[oldl], %[oldh], %[mem]\n\t"
|
|
"stlxp %w[tmp], %[newl], %[newh], %[mem]\n\t"
|
|
"cbnz %w[tmp], 0b"
|
|
: [mem] "+m"(*ptr), [tmp] "=&r"(tmp),
|
|
[oldl] "=&r"(oldl), [oldh] "=&r"(oldh)
|
|
: [newl] "r"(newl), [newh] "r"(newh)
|
|
: "memory");
|
|
|
|
return int128_make128(oldl, oldh);
|
|
}
|
|
|
|
static inline Int128 atomic16_fetch_and(Int128 *ptr, Int128 new)
|
|
{
|
|
uint64_t newl = int128_getlo(new), newh = int128_gethi(new);
|
|
uint64_t oldl, oldh, tmpl, tmph;
|
|
uint32_t tmp;
|
|
|
|
asm("0: ldaxp %[oldl], %[oldh], %[mem]\n\t"
|
|
"and %[tmpl], %[oldl], %[newl]\n\t"
|
|
"and %[tmph], %[oldh], %[newh]\n\t"
|
|
"stlxp %w[tmp], %[tmpl], %[tmph], %[mem]\n\t"
|
|
"cbnz %w[tmp], 0b"
|
|
: [mem] "+m"(*ptr), [tmp] "=&r"(tmp),
|
|
[oldl] "=&r"(oldl), [oldh] "=&r"(oldh),
|
|
[tmpl] "=&r"(tmpl), [tmph] "=&r"(tmph)
|
|
: [newl] "r"(newl), [newh] "r"(newh)
|
|
: "memory");
|
|
|
|
return int128_make128(oldl, oldh);
|
|
}
|
|
|
|
static inline Int128 atomic16_fetch_or(Int128 *ptr, Int128 new)
|
|
{
|
|
uint64_t newl = int128_getlo(new), newh = int128_gethi(new);
|
|
uint64_t oldl, oldh, tmpl, tmph;
|
|
uint32_t tmp;
|
|
|
|
asm("0: ldaxp %[oldl], %[oldh], %[mem]\n\t"
|
|
"orr %[tmpl], %[oldl], %[newl]\n\t"
|
|
"orr %[tmph], %[oldh], %[newh]\n\t"
|
|
"stlxp %w[tmp], %[tmpl], %[tmph], %[mem]\n\t"
|
|
"cbnz %w[tmp], 0b"
|
|
: [mem] "+m"(*ptr), [tmp] "=&r"(tmp),
|
|
[oldl] "=&r"(oldl), [oldh] "=&r"(oldh),
|
|
[tmpl] "=&r"(tmpl), [tmph] "=&r"(tmph)
|
|
: [newl] "r"(newl), [newh] "r"(newh)
|
|
: "memory");
|
|
|
|
return int128_make128(oldl, oldh);
|
|
}
|
|
|
|
# define CONFIG_CMPXCHG128 1
|
|
# define HAVE_CMPXCHG128 1
|
|
#endif
|
|
|
|
#endif /* AARCH64_ATOMIC128_CAS_H */
|