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+/* Copyright (C) 2012 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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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., 51 Franklin Street - Fifth Floor,
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+ Boston, MA 02110-1301, USA. */
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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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+/* Xtensa has only a 32-bit form of a store-conditional instruction,
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+ so just stub out the rest. */
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+
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+/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
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+ Return the old *MEM value. */
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+
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+#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
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+ ({__typeof__(*(mem)) __tmp, __value; \
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+ __asm__ __volatile__( \
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+ "1: l32i %1, %2, 0 \n" \
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+ " bne %1, %4, 2f \n" \
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+ " wsr %1, SCOMPARE1 \n" \
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+ " mov %0, %1 \n" \
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+ " mov %1, %3 \n" \
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+ " s32c1i %1, %2, 0 \n" \
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+ " bne %0, %1, 1b \n" \
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+ "2: \n" \
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+ : "=&a" (__value), "=&a" (__tmp) \
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+ : "a" (mem), "a" (newval), "a" (oldval) \
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+ : "memory" ); \
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+ __tmp; \
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+ })
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+
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+/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
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+ Return zero if *MEM was changed or non-zero if no exchange happened. */
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+
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+#define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \
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+ ({__typeof__(*(mem)) __tmp, __value; \
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+ __asm__ __volatile__( \
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+ "1: l32i %0, %2, 0 \n" \
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+ " sub %1, %4, %0 \n" \
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+ " bnez %1, 2f \n" \
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+ " wsr %0, SCOMPARE1 \n" \
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+ " mov %1, %3 \n" \
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+ " s32c1i %1, %2, 0 \n" \
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+ " bne %0, %1, 1b \n" \
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+ " movi %1, 0 \n" \
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+ "2: \n" \
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+ : "=&a" (__value), "=&a" (__tmp) \
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+ : "a" (mem), "a" (newval), "a" (oldval) \
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+ : "memory" ); \
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+ __tmp != 0; \
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+ })
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+
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+/* Store NEWVALUE in *MEM and return the old value. */
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+
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+#define __arch_exchange_32_acq(mem, newval) \
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+ ({__typeof__(*(mem)) __tmp, __value; \
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+ __asm__ __volatile__( \
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+ "1: l32i %0, %2, 0 \n" \
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+ " wsr %0, SCOMPARE1 \n" \
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+ " mov %1, %3 \n" \
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+ " s32c1i %1, %2, 0 \n" \
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+ " bne %0, %1, 1b \n" \
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+ : "=&a" (__value), "=&a" (__tmp) \
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+ : "a" (mem), "a" (newval) \
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+ : "memory" ); \
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+ __tmp; \
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+ })
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+
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+/* Add VALUE to *MEM and return the old value of *MEM. */
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+
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+#define __arch_atomic_exchange_and_add_32(mem, value) \
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+ ({__typeof__(*(mem)) __tmp, __value; \
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+ __asm__ __volatile__( \
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+ "1: l32i %0, %2, 0 \n" \
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+ " wsr %0, SCOMPARE1 \n" \
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+ " add %1, %0, %3 \n" \
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+ " s32c1i %1, %2, 0 \n" \
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+ " bne %0, %1, 1b \n" \
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+ : "=&a" (__value), "=&a" (__tmp) \
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+ : "a" (mem), "a" (value) \
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+ : "memory" ); \
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+ __tmp; \
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+ })
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+
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+/* Subtract VALUE from *MEM and return the old value of *MEM. */
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+
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+#define __arch_atomic_exchange_and_sub_32(mem, value) \
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+ ({__typeof__(*(mem)) __tmp, __value; \
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+ __asm__ __volatile__( \
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+ "1: l32i %0, %2, 0 \n" \
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+ " wsr %0, SCOMPARE1 \n" \
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+ " sub %1, %0, %3 \n" \
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+ " s32c1i %1, %2, 0 \n" \
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+ " bne %0, %1, 1b \n" \
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+ : "=&a" (__value), "=&a" (__tmp) \
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+ : "a" (mem), "a" (value) \
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+ : "memory" ); \
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+ __tmp; \
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+ })
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+
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+/* Decrement *MEM if it is > 0, and return the old value. */
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+
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+#define __arch_atomic_decrement_if_positive_32(mem) \
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+ ({__typeof__(*(mem)) __tmp, __value; \
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+ __asm__ __volatile__( \
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+ "1: l32i %0, %2, 0 \n" \
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+ " blti %0, 1, 2f \n" \
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+ " wsr %0, SCOMPARE1 \n" \
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+ " addi %1, %0, -1 \n" \
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+ " s32c1i %1, %2, 0 \n" \
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+ " bne %0, %1, 1b \n" \
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+ "2: \n" \
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+ : "=&a" (__value), "=&a" (__tmp) \
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+ : "a" (mem) \
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+ : "memory" ); \
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+ __tmp; \
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+ })
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+
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+
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+/* These are the preferred public interfaces: */
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+
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+#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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+ ({ \
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+ if (sizeof (*mem) != 4) \
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+ abort(); \
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+ __arch_compare_and_exchange_val_32_acq(mem, newval, oldval); \
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+ })
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+
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+#define atomic_exchange_acq(mem, newval) \
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+ ({ \
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+ if (sizeof(*(mem)) != 4) \
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+ abort(); \
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+ __arch_exchange_32_acq(mem, newval); \
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+ })
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+
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+#define atomic_exchange_and_add(mem, newval) \
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+ ({ \
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+ if (sizeof(*(mem)) != 4) \
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+ abort(); \
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+ __arch_atomic_exchange_and_add_32(mem, newval); \
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+ })
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+
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+#define atomic_exchange_and_sub(mem, newval) \
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+ ({ \
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+ if (sizeof(*(mem)) != 4) \
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+ abort(); \
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+ __arch_atomic_exchange_and_sub_32(mem, newval); \
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+ })
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+
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+#define atomic_decrement_if_positive(mem) \
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+ ({ \
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+ if (sizeof(*(mem)) != 4) \
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+ abort(); \
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+ __arch_atomic_decrement_if_positive_32(mem); \
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+ })
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+
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+#endif /* _BITS_ATOMIC_H */
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+
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Chris Zankel