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/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Carlos O'Donell <carlos@baldric.uwo.ca>, 2005.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include <stdint.h> /* Required for type definitions e.g. uint8_t. */
#ifndef _ATOMIC_MACHINE_H
#define _ATOMIC_MACHINE_H 1
typedef int8_t atomic8_t;
typedef uint8_t uatomic8_t;
typedef int_fast8_t atomic_fast8_t;
typedef uint_fast8_t uatomic_fast8_t;
typedef int32_t atomic32_t;
typedef uint32_t uatomic32_t;
typedef int_fast32_t atomic_fast32_t;
typedef uint_fast32_t uatomic_fast32_t;
typedef intptr_t atomicptr_t;
typedef uintptr_t uatomicptr_t;
typedef intmax_t atomic_max_t;
typedef uintmax_t uatomic_max_t;
#define __HAVE_64B_ATOMICS 0
#define USE_ATOMIC_COMPILER_BUILTINS 0
/* XXX Is this actually correct? */
#define ATOMIC_EXCHANGE_USES_CAS 1
/* prev = *addr;
if (prev == old)
*addr = new;
return prev; */
/* Use the kernel atomic light weight syscalls on hppa. */
#define _LWS "0xb0"
#define _LWS_CAS "0"
/* Note r31 is the link register. */
#define _LWS_CLOBBER "r1", "r23", "r22", "r20", "r31", "memory"
/* String constant for -EAGAIN. */
#define _ASM_EAGAIN "-11"
/* String constant for -EDEADLOCK. */
#define _ASM_EDEADLOCK "-45"
/* The only basic operation needed is compare and exchange. The mem
pointer must be word aligned. We no longer loop on deadlock. */
#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
({ \
register long lws_errno asm("r21"); \
register unsigned long lws_ret asm("r28"); \
register unsigned long lws_mem asm("r26") = (unsigned long)(mem); \
register unsigned long lws_old asm("r25") = (unsigned long)(oldval);\
register unsigned long lws_new asm("r24") = (unsigned long)(newval);\
__asm__ __volatile__( \
"0: \n\t" \
"ble " _LWS "(%%sr2, %%r0) \n\t" \
"ldi " _LWS_CAS ", %%r20 \n\t" \
"cmpiclr,<> " _ASM_EAGAIN ", %%r21, %%r0\n\t" \
"b,n 0b \n\t" \
"cmpclr,= %%r0, %%r21, %%r0 \n\t" \
"iitlbp %%r0,(%%sr0, %%r0) \n\t" \
: "=r" (lws_ret), "=r" (lws_errno) \
: "r" (lws_mem), "r" (lws_old), "r" (lws_new) \
: _LWS_CLOBBER \
); \
\
(__typeof (oldval)) lws_ret; \
})
#define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
({ \
__typeof__ (*mem) ret; \
ret = atomic_compare_and_exchange_val_acq(mem, newval, oldval); \
/* Return 1 if it was already acquired. */ \
(ret != oldval); \
})
#endif
/* _ATOMIC_MACHINE_H */
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