226 lines
7.5 KiB
C
226 lines
7.5 KiB
C
/* Machine-dependent pthreads configuration and inline functions.
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x86-64 version.
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Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _PT_MACHINE_H
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#define _PT_MACHINE_H 1
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#ifndef __ASSEMBLER__
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# include <stddef.h> /* For offsetof. */
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# include <stdlib.h> /* For abort(). */
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# include <asm/prctl.h>
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# ifndef PT_EI
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# define PT_EI extern inline __attribute__ ((always_inline))
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# endif
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extern long int testandset (int *spinlock);
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extern int __compare_and_swap (long int *p, long int oldval, long int newval);
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/* Get some notion of the current stack. Need not be exactly the top
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of the stack, just something somewhere in the current frame. */
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# define CURRENT_STACK_FRAME stack_pointer
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register char * stack_pointer __asm__ ("%rsp") __attribute_used__;
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/* Spinlock implementation; required. */
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PT_EI long int
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testandset (int *spinlock)
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{
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long int ret;
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__asm__ __volatile__ (
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"xchgl %k0, %1"
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: "=r"(ret), "=m"(*spinlock)
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: "0"(1), "m"(*spinlock)
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: "memory");
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return ret;
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}
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/* Compare-and-swap for semaphores. */
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# define HAS_COMPARE_AND_SWAP
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PT_EI int
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__compare_and_swap (long int *p, long int oldval, long int newval)
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{
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char ret;
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long int readval;
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__asm__ __volatile__ ("lock; cmpxchgq %3, %1; sete %0"
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: "=q" (ret), "=m" (*p), "=a" (readval)
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: "r" (newval), "m" (*p), "a" (oldval)
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: "memory");
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return ret;
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}
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/* Return the thread descriptor for the current thread.
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The contained asm must *not* be marked volatile since otherwise
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assignments like
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pthread_descr self = thread_self();
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do not get optimized away. */
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# define THREAD_SELF \
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({ \
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register pthread_descr __self; \
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__asm__ ("movq %%fs:%c1,%0" : "=r" (__self) \
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: "i" (offsetof (struct _pthread_descr_struct, \
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p_header.data.self))); \
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__self; \
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})
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/* Prototype for the system call. */
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extern int __arch_prctl (int __code, unsigned long __addr);
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/* Initialize the thread-unique value. */
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# define INIT_THREAD_SELF(descr, nr) \
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{ \
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if (__arch_prctl (ARCH_SET_FS, (unsigned long)descr) != 0) \
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abort (); \
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}
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/* Read member of the thread descriptor directly. */
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# define THREAD_GETMEM(descr, member) \
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({ \
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__typeof__ (descr->member) __value; \
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if (sizeof (__value) == 1) \
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__asm__ __volatile__ ("movb %%fs:%P2,%b0" \
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: "=q" (__value) \
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: "0" (0), \
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"i" (offsetof (struct _pthread_descr_struct, \
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member))); \
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else if (sizeof (__value) == 4) \
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__asm__ __volatile__ ("movl %%fs:%P2,%k0" \
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: "=r" (__value) \
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: "0" (0), \
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"i" (offsetof (struct _pthread_descr_struct, \
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member))); \
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else \
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{ \
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if (sizeof (__value) != 8) \
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/* There should not be any value with a size other than 1, 4 or 8. */\
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abort (); \
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\
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__asm__ __volatile__ ("movq %%fs:%P1,%0" \
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: "=r" (__value) \
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: "i" (offsetof (struct _pthread_descr_struct, \
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member))); \
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} \
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__value; \
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})
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/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
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# define THREAD_GETMEM_NC(descr, member) \
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({ \
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__typeof__ (descr->member) __value; \
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if (sizeof (__value) == 1) \
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__asm__ __volatile__ ("movb %%fs:(%2),%b0" \
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: "=q" (__value) \
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: "0" (0), \
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"r" (offsetof (struct _pthread_descr_struct, \
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member))); \
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else if (sizeof (__value) == 4) \
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__asm__ __volatile__ ("movl %%fs:(%2),%k0" \
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: "=r" (__value) \
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: "0" (0), \
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"r" (offsetof (struct _pthread_descr_struct, \
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member))); \
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else \
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{ \
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if (sizeof (__value) != 8) \
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/* There should not be any value with a size other than 1, 4 or 8. */\
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abort (); \
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\
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__asm__ __volatile__ ("movq %%fs:(%1),%0" \
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: "=r" (__value) \
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: "r" (offsetof (struct _pthread_descr_struct, \
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member))); \
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} \
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__value; \
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})
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/* Set member of the thread descriptor directly. */
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# define THREAD_SETMEM(descr, member, value) \
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({ \
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__typeof__ (descr->member) __value = (value); \
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if (sizeof (__value) == 1) \
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__asm__ __volatile__ ("movb %0,%%fs:%P1" : \
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: "q" (__value), \
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"i" (offsetof (struct _pthread_descr_struct, \
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member))); \
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else if (sizeof (__value) == 4) \
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__asm__ __volatile__ ("movl %k0,%%fs:%P1" : \
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: "r" (__value), \
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"i" (offsetof (struct _pthread_descr_struct, \
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member))); \
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else \
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{ \
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if (sizeof (__value) != 8) \
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/* There should not be any value with a size other than 1, 4 or 8. */\
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abort (); \
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\
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__asm__ __volatile__ ("movq %0,%%fs:%P1" : \
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: "r" (__value), \
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"i" (offsetof (struct _pthread_descr_struct, \
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member))); \
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} \
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})
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/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
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# define THREAD_SETMEM_NC(descr, member, value) \
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({ \
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__typeof__ (descr->member) __value = (value); \
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if (sizeof (__value) == 1) \
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__asm__ __volatile__ ("movb %0,%%fs:(%1)" : \
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: "q" (__value), \
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"r" (offsetof (struct _pthread_descr_struct, \
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member))); \
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else if (sizeof (__value) == 4) \
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__asm__ __volatile__ ("movl %k0,%%fs:(%1)" : \
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: "r" (__value), \
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"r" (offsetof (struct _pthread_descr_struct, \
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member))); \
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else \
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{ \
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if (sizeof (__value) != 8) \
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/* There should not be any value with a size other than 1, 4 or 8. */\
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abort (); \
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\
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__asm__ __volatile__ ("movq %0,%%fs:(%1)" : \
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: "r" (__value), \
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"r" (offsetof (struct _pthread_descr_struct, \
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member))); \
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} \
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})
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#endif /* !__ASSEMBLER__ */
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/* We want the OS to assign stack addresses. */
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#define FLOATING_STACKS 1
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/* Maximum size of the stack if the rlimit is unlimited. */
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#define ARCH_STACK_MAX_SIZE 32*1024*1024
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/* The ia32e really want some help to prevent overheating. */
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#define BUSY_WAIT_NOP __asm__ ("rep; nop")
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#endif /* pt-machine.h */
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