From 71150804d1ac8ed2f7b9c6d3025fd415c58b129e Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Thu, 15 Jul 2004 07:34:00 +0000 Subject: h8300 updates from Yoshinori Sato --- libc/sysdeps/linux/h8300/bits/atomicity.h | 79 +++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 libc/sysdeps/linux/h8300/bits/atomicity.h (limited to 'libc/sysdeps/linux/h8300/bits/atomicity.h') diff --git a/libc/sysdeps/linux/h8300/bits/atomicity.h b/libc/sysdeps/linux/h8300/bits/atomicity.h new file mode 100644 index 000000000..a4fcc1524 --- /dev/null +++ b/libc/sysdeps/linux/h8300/bits/atomicity.h @@ -0,0 +1,79 @@ +/* Low-level functions for atomic operations. H8/300 version. + Copyright (C) 1997, 2000, 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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. */ + +#ifndef _ATOMICITY_H +#define _ATOMICITY_H 1 + +#include + + +static inline uint32_t +__attribute__ ((unused)) +exchange_and_add (volatile uint32_t *mem, uint32_t val) +{ + uint32_t result; + __asm__ __volatile__ ("stc ccr,@-sp\n\t" + "orc #0x80,ccr\n\t" + "mov.l %1,er1\n\t" + "mov.l %0,%1\n\t" + "add.l er1,%0\n\t" + "ldc @sp+,ccr" + : "=r" (result), "=m" (*mem) + : "0" (val), "1" (*mem) + : "er1"); + return result; +} + +static inline void +__attribute__ ((unused)) +atomic_add (volatile uint32_t *mem, int val) +{ + __asm__ __volatile__ ("stc ccr,@-sp\n\t" + "orc #0x80,ccr\n\t" + "mov.l %0,er0\n\t" + "add %1,er0\n\t" + "mov.l er0,%0\n\t" + "ldc @sp+,ccr" + : "=m" (*mem) + : "r" (val), "0" (*mem) + : "er0"); +} + +static inline int +__attribute__ ((unused)) +compare_and_swap (volatile long int *p, long int oldval, long int newval) +{ + int ret = 0; + + __asm__ __volatile__ ("stc ccr,@-sp\n\t" + "orc #0x80,ccr\n\t" + "mov.l %1,er0\n\t" + "cmp.l %2,er0\n\t" + "bne 1f\n\t" + "mov.l %3,%1\n\t" + "inc.l #1,%0\n" + "1:\n\t" + "ldc @sp+,ccr" + : "=r"(ret),"=m"(*p) + : "r"(oldval),"r"(newval),"0"(ret),"1"(*p) + : "er0"); + return ret; +} + +#endif /* atomicity.h */ -- cgit v1.2.3