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- /* Machine-dependent pthreads configuration and inline functions.
- ARM version.
- Copyright (C) 1997, 1998, 2000, 2002 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Philip Blundell <philb@gnu.org>.
- 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; see the file COPYING.LIB. If
- not, see <http://www.gnu.org/licenses/>. */
- #ifndef _PT_MACHINE_H
- #define _PT_MACHINE_H 1
- #include <sys/syscall.h>
- #include <unistd.h>
- #ifndef PT_EI
- # define PT_EI __extern_always_inline
- #endif
- #if defined(__thumb2__)
- PT_EI long int ldrex(int *spinlock)
- {
- long int ret;
- __asm__ __volatile__(
- "ldrex %0, [%1]\n"
- : "=r"(ret)
- : "r"(spinlock) : "memory");
- return ret;
- }
- PT_EI long int strex(int val, int *spinlock)
- {
- long int ret;
- __asm__ __volatile__(
- "strex %0, %1, [%2]\n"
- : "=r"(ret)
- : "r" (val), "r"(spinlock) : "memory");
- return ret;
- }
- /* Spinlock implementation; required. */
- PT_EI long int
- testandset (int *spinlock)
- {
- register unsigned int ret;
- do {
- ret = ldrex(spinlock);
- } while (strex(1, spinlock));
- return ret;
- }
- #elif defined(__thumb__)
- /* This will not work on ARM1 or ARM2 because SWP is lacking on those
- machines. Unfortunately we have no way to detect this at compile
- time; let's hope nobody tries to use one. */
- /* Spinlock implementation; required. */
- PT_EI long int testandset (int *spinlock);
- PT_EI long int testandset (int *spinlock)
- {
- register unsigned int ret;
- void *pc;
- __asm__ __volatile__(
- ".align 0\n"
- "\tbx pc\n"
- "\tnop\n"
- "\t.arm\n"
- "\tswp %0, %2, [%3]\n"
- "\torr %1, pc, #1\n"
- "\tbx %1\n"
- "\t.force_thumb"
- : "=r"(ret), "=r"(pc)
- : "0"(1), "r"(spinlock));
- return ret;
- }
- #else /* __thumb__ */
- PT_EI long int testandset (int *spinlock);
- PT_EI long int testandset (int *spinlock)
- {
- register unsigned int ret;
- __asm__ __volatile__("swp %0, %1, [%2]"
- : "=r"(ret)
- : "0"(1), "r"(spinlock));
- return ret;
- }
- #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__ ("sp");
- #endif /* pt-machine.h */
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