add bits/atomic.h for hppa

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>

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 */