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-rw-r--r--libc/sysdeps/linux/hppa/bits/atomic.h103
1 files changed, 103 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/hppa/bits/atomic.h b/libc/sysdeps/linux/hppa/bits/atomic.h
new file mode 100644
index 000000000..87aeb84a0
--- /dev/null
+++ b/libc/sysdeps/linux/hppa/bits/atomic.h
@@ -0,0 +1,103 @@
+/* Copyright (C) 2003 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <stdint.h>
+#include <bits/kernel-features.h>
+
+#define ABORT_INSTRUCTION __asm__(__UCLIBC_ABORT_INSTRUCTION__)
+
+/* We need EFAULT, ENOSYS */
+#if !defined EFAULT && !defined ENOSYS
+#define EFAULT 14
+#define ENOSYS 251
+#endif
+
+#ifndef _BITS_ATOMIC_H
+#define _BITS_ATOMIC_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;
+
+/* 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", "r26", "r25", "r24", "r23", "r22", "r21", "r20", "r28", "r31", "memory"
+#define ASM_EAGAIN "11"
+
+#if __ASSUME_LWS_CAS
+/* The only basic operation needed is compare and exchange. */
+# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
+ ({ \
+ volatile int lws_errno = EFAULT; \
+ volatile int lws_ret = 0xdeadbeef; \
+ __asm__ volatile( \
+ "0: \n\t" \
+ "copy %3, %%r26 \n\t" \
+ "copy %4, %%r25 \n\t" \
+ "copy %5, %%r24 \n\t" \
+ "ble " LWS "(%%sr2, %%r0) \n\t" \
+ "ldi " LWS_CAS ", %%r20 \n\t" \
+ "cmpib,=,n " ASM_EAGAIN ",%%r21,0b \n\t" \
+ "nop \n\t" \
+ "stw %%r28, %0 \n\t" \
+ "sub %%r0, %%r21, %%r21 \n\t" \
+ "stw %%r21, %1 \n\t" \
+ : "=m" (lws_ret), "=m" (lws_errno), "=m" (*mem) \
+ : "r" (mem), "r" (oldval), "r" (newval) \
+ : LWS_CLOBBER \
+ ); \
+ \
+ if(lws_errno == EFAULT || lws_errno == ENOSYS) \
+ ABORT_INSTRUCTION; \
+ \
+ lws_ret; \
+ })
+
+# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
+ ({ \
+ int ret; \
+ ret = atomic_compare_and_exchange_val_acq(mem, newval, oldval); \
+ /* Return 1 if it was already acquired */ \
+ (ret != oldval); \
+ })
+#else
+# error __ASSUME_LWS_CAS is required to build uClibc.
+#endif
+/* __ASSUME_LWS_CAS */
+
+#endif
+/* _BITS_ATOMIC_H */