From 67eff66438688fddebe41f77fd252a3b2b135271 Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Mon, 3 Mar 2003 20:58:42 +0000 Subject: Initial effort at adding profiling support. --- libc/sysdeps/linux/sparc/bits/atomicity.h | 98 +++++++++++++++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 libc/sysdeps/linux/sparc/bits/atomicity.h (limited to 'libc/sysdeps/linux/sparc/bits/atomicity.h') diff --git a/libc/sysdeps/linux/sparc/bits/atomicity.h b/libc/sysdeps/linux/sparc/bits/atomicity.h new file mode 100644 index 000000000..ec82541c2 --- /dev/null +++ b/libc/sysdeps/linux/sparc/bits/atomicity.h @@ -0,0 +1,98 @@ +/* Low-level functions for atomic operations. Sparc32 version. + Copyright (C) 1999 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 int +__attribute__ ((unused)) +exchange_and_add (volatile uint32_t *mem, int val) +{ + static unsigned char lock; + int result, tmp; + + __asm__ __volatile__("1: ldstub [%1], %0\n\t" + " cmp %0, 0\n\t" + " bne 1b\n\t" + " nop" + : "=&r" (tmp) + : "r" (&lock) + : "memory"); + result = *mem; + *mem += val; + __asm__ __volatile__("stb %%g0, [%0]" + : /* no outputs */ + : "r" (&lock) + : "memory"); + return result; +} + +static void +__attribute__ ((unused)) +atomic_add (volatile uint32_t *mem, int val) +{ + static unsigned char lock; + int tmp; + + __asm__ __volatile__("1: ldstub [%1], %0\n\t" + " cmp %0, 0\n\t" + " bne 1b\n\t" + " nop" + : "=&r" (tmp) + : "r" (&lock) + : "memory"); + *mem += val; + __asm__ __volatile__("stb %%g0, [%0]" + : /* no outputs */ + : "r" (&lock) + : "memory"); +} + +static int +__attribute__ ((unused)) +compare_and_swap (volatile long int *p, long int oldval, long int newval) +{ + static unsigned char lock; + int ret, tmp; + + __asm__ __volatile__("1: ldstub [%1], %0\n\t" + " cmp %0, 0\n\t" + " bne 1b\n\t" + " nop" + : "=&r" (tmp) + : "r" (&lock) + : "memory"); + if (*p != oldval) + ret = 0; + else + { + *p = newval; + ret = 1; + } + __asm__ __volatile__("stb %%g0, [%0]" + : /* no outputs */ + : "r" (&lock) + : "memory"); + + return ret; +} + +#endif /* atomicity.h */ -- cgit v1.2.3