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1 files changed, 103 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/hppa/atomic-machine.h b/sysdeps/unix/sysv/linux/hppa/atomic-machine.h
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+++ b/sysdeps/unix/sysv/linux/hppa/atomic-machine.h
@@ -0,0 +1,103 @@
+/* Copyright (C) 2003-2015 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdint.h> /*  Required for type definitions e.g. uint8_t.  */
+#include <abort-instr.h> /*  Required for ABORT_INSTRUCTIUON.  */
+
+/* We need EFAULT, ENONSYS */
+#if !defined EFAULT && !defined ENOSYS
+#define EFAULT	14
+#define ENOSYS	251
+#endif
+
+#ifndef _ATOMIC_MACHINE_H
+#define _ATOMIC_MACHINE_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;
+
+#define __HAVE_64B_ATOMICS 0
+#define USE_ATOMIC_COMPILER_BUILTINS 0
+
+/* 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", "r23", "r22", "r20", "r31", "memory"
+/* String constant for -EAGAIN.  */
+#define _ASM_EAGAIN "-11"
+/* String constant for -EDEADLOCK.  */
+#define _ASM_EDEADLOCK "-45"
+
+/* The only basic operation needed is compare and exchange.  The mem
+   pointer must be word aligned.  */
+#define atomic_compare_and_exchange_val_acq(mem, newval, oldval)	\
+  ({									\
+     register long lws_errno asm("r21");				\
+     register unsigned long lws_ret asm("r28");				\
+     register unsigned long lws_mem asm("r26") = (unsigned long)(mem);	\
+     register unsigned long lws_old asm("r25") = (unsigned long)(oldval);\
+     register unsigned long lws_new asm("r24") = (unsigned long)(newval);\
+     __asm__ __volatile__(						\
+	"0:					\n\t"			\
+	"ble	" _LWS "(%%sr2, %%r0)		\n\t"			\
+	"ldi	" _LWS_CAS ", %%r20		\n\t"			\
+	"ldi	" _ASM_EAGAIN ", %%r20		\n\t"			\
+	"cmpb,=,n %%r20, %%r21, 0b		\n\t"			\
+	"nop					\n\t"			\
+	"ldi	" _ASM_EDEADLOCK ", %%r20	\n\t"			\
+	"cmpb,=,n %%r20, %%r21, 0b		\n\t"			\
+	"nop					\n\t"			\
+	: "=r" (lws_ret), "=r" (lws_errno)				\
+	: "r" (lws_mem), "r" (lws_old), "r" (lws_new)			\
+	: _LWS_CLOBBER							\
+     );									\
+									\
+     if (lws_errno == -EFAULT || lws_errno == -ENOSYS)			\
+	ABORT_INSTRUCTION;						\
+									\
+     (__typeof (oldval)) lws_ret;					\
+   })
+
+#define atomic_compare_and_exchange_bool_acq(mem, newval, oldval)	\
+  ({									\
+     __typeof__ (*mem) ret;						\
+     ret = atomic_compare_and_exchange_val_acq(mem, newval, oldval);	\
+     /* Return 1 if it was already acquired.  */			\
+     (ret != oldval);							\
+   })
+
+#endif
+/* _ATOMIC_MACHINE_H */