kumquat-buildroot/toolchain/uClibc/uClibc-0.9.30-xtensa-013-atomic.h.patch
Peter Korsgaard c1b3b6cab0 toolchain/uclibc: xtensa patches
New files missing from 58050c28.

Signed-off-by: Maxim Grigoriev <maxim2405@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
2009-07-25 20:25:34 +02:00

166 lines
8.7 KiB
Diff

--- /dev/null 2008-09-18 06:50:54.356228028 -0700
+++ uClibc-0.9.29/libc/sysdeps/linux/xtensa/bits/atomic.h 2008-10-04 11:40:21.000000000 -0700
@@ -0,0 +1,162 @@
+/*
+ * Copyright (C) 2008 Tensilica, Inc.
+ * Contributed by Joe Taylor <joe@tensilica.com> 2008
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+
+#ifndef _XTENSA_BITS_ATOMIC_H
+#define _XTENSA_BITS_ATOMIC_H 1
+
+/* Xtensa has only a 32-bit form of a store-conditional instruction,
+ so just stub out the rest. */
+
+/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
+ Return the old *MEM value. */
+
+#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ "1: l32i %1, %2, 0 \n" \
+ " bne %1, %4, 2f \n" \
+ " wsr %1, SCOMPARE1 \n" \
+ " mov %0, %1 \n" \
+ " mov %1, %3 \n" \
+ " s32c1i %1, %2, 0 \n" \
+ " bne %0, %1, 1b \n" \
+ "2: \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem), "a" (newval), "a" (oldval) \
+ : "memory" ); \
+ __tmp; \
+ })
+
+/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
+ Return zero if *MEM was changed or non-zero if no exchange happened. */
+
+#define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ "1: l32i %0, %2, 0 \n" \
+ " sub %1, %4, %0 \n" \
+ " bnez %1, 2f \n" \
+ " wsr %0, SCOMPARE1 \n" \
+ " mov %1, %3 \n" \
+ " s32c1i %1, %2, 0 \n" \
+ " bne %0, %1, 1b \n" \
+ " movi %1, 0 \n" \
+ "2: \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem), "a" (newval), "a" (oldval) \
+ : "memory" ); \
+ __tmp != 0; \
+ })
+
+/* Store NEWVALUE in *MEM and return the old value. */
+
+#define __arch_exchange_32_acq(mem, newval) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ "1: l32i %0, %2, 0 \n" \
+ " wsr %0, SCOMPARE1 \n" \
+ " mov %1, %3 \n" \
+ " s32c1i %1, %2, 0 \n" \
+ " bne %0, %1, 1b \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem), "a" (newval) \
+ : "memory" ); \
+ __tmp; \
+ })
+
+/* Add VALUE to *MEM and return the old value of *MEM. */
+
+#define __arch_atomic_exchange_and_add_32(mem, value) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ "1: l32i %0, %2, 0 \n" \
+ " wsr %0, SCOMPARE1 \n" \
+ " add %1, %0, %3 \n" \
+ " s32c1i %1, %2, 0 \n" \
+ " bne %0, %1, 1b \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem), "a" (value) \
+ : "memory" ); \
+ __tmp; \
+ })
+
+/* Subtract VALUE from *MEM and return the old value of *MEM. */
+
+#define __arch_atomic_exchange_and_sub_32(mem, value) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ "1: l32i %0, %2, 0 \n" \
+ " wsr %0, SCOMPARE1 \n" \
+ " sub %1, %0, %3 \n" \
+ " s32c1i %1, %2, 0 \n" \
+ " bne %0, %1, 1b \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem), "a" (value) \
+ : "memory" ); \
+ __tmp; \
+ })
+
+/* Decrement *MEM if it is > 0, and return the old value. */
+
+#define __arch_atomic_decrement_if_positive_32(mem) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ "1: l32i %0, %2, 0 \n" \
+ " blti %0, 1, 2f \n" \
+ " wsr %0, SCOMPARE1 \n" \
+ " addi %1, %0, -1 \n" \
+ " s32c1i %1, %2, 0 \n" \
+ " bne %0, %1, 1b \n" \
+ "2: \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem) \
+ : "memory" ); \
+ __tmp; \
+ })
+
+
+/* These are the preferred public interfaces: */
+
+#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
+ ({ \
+ if (sizeof (*mem) != 4) \
+ abort(); \
+ __arch_compare_and_exchange_val_32_acq(mem, newval, oldval); \
+ })
+
+#define atomic_exchange_acq(mem, newval) \
+ ({ \
+ if (sizeof(*(mem)) != 4) \
+ abort(); \
+ __arch_exchange_32_acq(mem, newval); \
+ })
+
+#define atomic_exchange_and_add(mem, newval) \
+ ({ \
+ if (sizeof(*(mem)) != 4) \
+ abort(); \
+ __arch_atomic_exchange_and_add_32(mem, newval); \
+ })
+
+#define atomic_exchange_and_sub(mem, newval) \
+ ({ \
+ if (sizeof(*(mem)) != 4) \
+ abort(); \
+ __arch_atomic_exchange_and_sub_32(mem, newval); \
+ })
+
+#define atomic_decrement_if_positive(mem) \
+ ({ \
+ if (sizeof(*(mem)) != 4) \
+ abort(); \
+ __arch_atomic_decrement_if_positive_32(mem); \
+ })
+
+#endif /* _XTENSA_BITS_ATOMIC_H */
+