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108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/* Copyright (C) 2003-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Carlos O'Donell <carlos@baldric.uwo.ca>, 2005.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdint.h> /* Required for type definitions e.g. uint8_t. */
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#include <abort-instr.h> /* Required for ABORT_INSTRUCTIUON. */
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#include <kernel-features.h> /* Required for __ASSUME_LWS_CAS. */
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/* We need EFAULT, ENONSYS */
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#if !defined EFAULT && !defined ENOSYS
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#define EFAULT 14
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#define ENOSYS 251
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#endif
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#ifndef _BITS_ATOMIC_H
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#define _BITS_ATOMIC_H 1
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typedef int8_t atomic8_t;
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typedef uint8_t uatomic8_t;
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typedef int_fast8_t atomic_fast8_t;
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typedef uint_fast8_t uatomic_fast8_t;
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typedef int32_t atomic32_t;
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typedef uint32_t uatomic32_t;
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typedef int_fast32_t atomic_fast32_t;
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typedef uint_fast32_t uatomic_fast32_t;
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typedef intptr_t atomicptr_t;
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typedef uintptr_t uatomicptr_t;
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typedef intmax_t atomic_max_t;
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typedef uintmax_t uatomic_max_t;
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/* prev = *addr;
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if (prev == old)
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*addr = new;
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return prev; */
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/* Use the kernel atomic light weight syscalls on hppa. */
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#define _LWS "0xb0"
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#define _LWS_CAS "0"
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/* Note r31 is the link register. */
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#define _LWS_CLOBBER "r1", "r26", "r25", "r24", "r23", "r22", "r21", "r20", "r28", "r31", "memory"
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/* String constant for -EAGAIN. */
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#define _ASM_EAGAIN "-11"
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/* String constant for -EDEADLOCK. */
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#define _ASM_EDEADLOCK "-45"
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#if __ASSUME_LWS_CAS
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/* The only basic operation needed is compare and exchange. */
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# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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({ \
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volatile int lws_errno; \
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volatile int lws_ret; \
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asm volatile( \
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"0: \n\t" \
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"copy %2, %%r26 \n\t" \
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"copy %3, %%r25 \n\t" \
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"copy %4, %%r24 \n\t" \
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"ble " _LWS "(%%sr2, %%r0) \n\t" \
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"ldi " _LWS_CAS ", %%r20 \n\t" \
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"ldi " _ASM_EAGAIN ", %%r24 \n\t" \
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"cmpb,=,n %%r24, %%r21, 0b \n\t" \
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"nop \n\t" \
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"ldi " _ASM_EDEADLOCK ", %%r25 \n\t" \
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"cmpb,=,n %%r25, %%r21, 0b \n\t" \
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"nop \n\t" \
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"stw %%r28, %0 \n\t" \
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"stw %%r21, %1 \n\t" \
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: "=m" (lws_ret), "=m" (lws_errno) \
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: "r" (mem), "r" (oldval), "r" (newval) \
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: _LWS_CLOBBER \
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); \
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\
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if(lws_errno == -EFAULT || lws_errno == -ENOSYS) \
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ABORT_INSTRUCTION; \
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\
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lws_ret; \
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})
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# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
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({ \
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int ret; \
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ret = atomic_compare_and_exchange_val_acq(mem, newval, oldval); \
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/* Return 1 if it was already acquired. */ \
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(ret != (int)oldval); \
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})
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#else
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# error __ASSUME_LWS_CAS is required to build glibc.
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#endif
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/* __ASSUME_LWS_CAS */
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#endif
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/* _BITS_ATOMIC_H */
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