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+/* Copyright (C) 2003 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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+
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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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+
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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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+
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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, write to the Free
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+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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+ 02111-1307 USA. */
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+
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+#include <stdint.h>
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+#include <bits/kernel-features.h>
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+
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+#define ABORT_INSTRUCTION __asm__(__UCLIBC_ABORT_INSTRUCTION__)
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+
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+/* We need EFAULT, ENOSYS */
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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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+
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+#ifndef _BITS_ATOMIC_H
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+#define _BITS_ATOMIC_H 1
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+
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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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+
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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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+
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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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+
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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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+
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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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+#define ASM_EAGAIN "11"
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+
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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 = EFAULT; \
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+ volatile int lws_ret = 0xdeadbeef; \
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+ __asm__ volatile( \
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+ "0: \n\t" \
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+ "copy %3, %%r26 \n\t" \
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+ "copy %4, %%r25 \n\t" \
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+ "copy %5, %%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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+ "cmpib,=,n " ASM_EAGAIN ",%%r21,0b \n\t" \
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+ "nop \n\t" \
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+ "stw %%r28, %0 \n\t" \
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+ "sub %%r0, %%r21, %%r21 \n\t" \
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+ "stw %%r21, %1 \n\t" \
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+ : "=m" (lws_ret), "=m" (lws_errno), "=m" (*mem) \
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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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+
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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 != oldval); \
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+ })
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+#else
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+# error __ASSUME_LWS_CAS is required to build uClibc.
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+#endif
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+/* __ASSUME_LWS_CAS */
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+
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+#endif
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+/* _BITS_ATOMIC_H */
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