mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-09 04:11:27 +08:00
9a29bc3732
1998-10-09 Ulrich Drepper <drepper@cygnus.com> * posix/ptestcases.h: Fix typo. 1998-10-08 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> * posix/regex.c (regcomp): Allocate and prepare a fastmap. (regexec): Allocate regs.start and regs.end as one block. 1998-10-08 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> * sysdeps/unix/sysv/linux/bits/socket.h: Remove comma at end of enum decl. 1998-10-08 Philip Blundell <pb@nexus.co.uk> * sysdeps/unix/sysv/linux/arm/profil-counter.h: Move definition of sigcontext union to ... * sysdeps/unix/sysv/linux/arm/bits/armsigctx.h: ... here. New file. * sysdeps/unix/sysv/linux/arm/register-dump.h: Add support for version 2.0 kernels.
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/* Machine-dependent pthreads configuration and inline functions.
|
|
powerpc version.
|
|
Copyright (C) 1996, 1997, 1998 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc.,
|
|
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
/* These routines are from Appendix G of the 'PowerPC 601 RISC Microprocessor
|
|
User's Manual', by IBM and Motorola. */
|
|
|
|
#ifndef PT_EI
|
|
# define PT_EI extern inline
|
|
#endif
|
|
|
|
/* For multiprocessor systems, we want to ensure all memory accesses
|
|
are completed before we reset a lock. */
|
|
#if 0
|
|
/* on non multiprocessor systems, you can just: */
|
|
#define sync() /* nothing */
|
|
#else
|
|
#define sync() __asm__ __volatile__ ("sync")
|
|
#endif
|
|
|
|
/* Get some notion of the current stack. Need not be exactly the top
|
|
of the stack, just something somewhere in the current frame. */
|
|
#define CURRENT_STACK_FRAME stack_pointer
|
|
register char * stack_pointer __asm__ ("r1");
|
|
|
|
/* Compare-and-swap for semaphores. */
|
|
/* note that test-and-set(x) is the same as compare-and-swap(x, 0, 1) */
|
|
|
|
#define HAS_COMPARE_AND_SWAP
|
|
#if BROKEN_PPC_ASM_CR0
|
|
static
|
|
#else
|
|
PT_EI
|
|
#endif
|
|
int
|
|
__compare_and_swap (long int *p, long int oldval, long int newval)
|
|
{
|
|
int ret;
|
|
|
|
sync();
|
|
__asm__ __volatile__(
|
|
"0: lwarx %0,0,%1 ;"
|
|
" xor. %0,%3,%0;"
|
|
" bne 1f;"
|
|
" stwcx. %2,0,%1;"
|
|
" bne- 0b;"
|
|
"1: "
|
|
: "=&r"(ret)
|
|
: "r"(p), "r"(newval), "r"(oldval)
|
|
: "cr0", "memory");
|
|
sync();
|
|
return ret == 0;
|
|
}
|