mirror of git://sourceware.org/git/glibc.git
255 lines
8.5 KiB
C
255 lines
8.5 KiB
C
/* Definition for thread-local data handling. nptl/x86_64 version.
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Copyright (C) 2002, 2003 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 _TLS_H
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#define _TLS_H 1
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#ifndef __ASSEMBLER__
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# include <stddef.h>
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# include <stdint.h>
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# include <stdlib.h>
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/* Type for the dtv. */
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typedef union dtv
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{
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size_t counter;
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void *pointer;
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} dtv_t;
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typedef struct
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{
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void *tcb; /* Pointer to the TCB. Not necessary the
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thread descriptor used by libpthread. */
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dtv_t *dtv;
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void *self; /* Pointer to the thread descriptor. */
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} tcbhead_t;
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#endif
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/* We require TLS support in the tools. */
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#ifndef HAVE_TLS_SUPPORT
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# error "TLS support is required."
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#endif
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/* Signal that TLS support is available. */
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#define USE_TLS 1
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/* Alignment requirement for the stack. */
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#define STACK_ALIGN 16
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#ifndef __ASSEMBLER__
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/* Get system call information. */
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# include <sysdep.h>
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/* Get the thread descriptor definition. */
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# include <nptl/descr.h>
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/* This is the size of the initial TCB. */
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# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
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/* Alignment requirements for the initial TCB. */
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# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
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/* This is the size of the TCB. */
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# define TLS_TCB_SIZE sizeof (struct pthread)
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/* Alignment requirements for the TCB. */
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# define TLS_TCB_ALIGN __alignof__ (struct pthread)
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/* The TCB can have any size and the memory following the address the
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thread pointer points to is unspecified. Allocate the TCB there. */
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# define TLS_TCB_AT_TP 1
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/* Install the dtv pointer. The pointer passed is to the element with
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index -1 which contain the length. */
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# define INSTALL_DTV(descr, dtvp) \
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((tcbhead_t *) (descr))->dtv = (dtvp) + 1
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/* Install new dtv for current thread. */
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# define INSTALL_NEW_DTV(dtvp) \
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({ struct pthread *__pd; \
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THREAD_SETMEM (__pd, dtv, (dtvp)); })
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/* Return dtv of given thread descriptor. */
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# define GET_DTV(descr) \
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(((tcbhead_t *) (descr))->dtv)
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/* Macros to load from and store into segment registers. */
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# define TLS_GET_FS() \
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({ int __seg; __asm ("movl %%fs, %0" : "=q" (__seg)); __seg; })
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# define TLS_SET_FS(val) \
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__asm ("movl %0, %%fs" :: "q" (val))
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/* Code to initially initialize the thread pointer. This might need
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special attention since 'errno' is not yet available and if the
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operation can cause a failure 'errno' must not be touched.
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We have to make the syscall for both uses of the macro since the
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address might be (and probably is) different. */
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# define TLS_INIT_TP(thrdescr, secondcall) \
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({ void *_thrdescr = (thrdescr); \
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tcbhead_t *_head = _thrdescr; \
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int _result; \
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\
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_head->tcb = _thrdescr; \
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/* For now the thread descriptor is at the same address. */ \
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_head->self = _thrdescr; \
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\
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/* It is a simple syscall to set the %fs value for the thread. */ \
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asm volatile ("syscall" \
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: "=a" (_result) \
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: "0" ((unsigned long int) __NR_arch_prctl), \
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"D" ((unsigned long int) ARCH_SET_FS), \
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"S" (_descr) \
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: "memory", "cc", "r11", "cx"); \
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\
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_result ? "cannot set %fs base address for thread-local storage" : 0; \
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})
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/* Return the address of the dtv for the current thread. */
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# define THREAD_DTV() \
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({ struct pthread *__pd; \
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THREAD_GETMEM (__pd, dtv); })
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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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({ struct pthread *__self; \
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asm ("movq %%fs:%c1,%0" : "=r" (__self) \
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: "i" (offsetof (struct pthread, self))); \
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__self;})
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/* Read member of the thread descriptor directly. */
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# define THREAD_GETMEM(descr, member) \
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({ __typeof (descr->member) __value; \
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if (sizeof (__value) == 1) \
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asm ("movb %%fs:%P2,%b0" \
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: "=q" (__value) \
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: "0" (0), "i" (offsetof (struct pthread, member))); \
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else if (sizeof (__value) == 4) \
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asm ("movl %%fs:%P1,%0" \
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: "=r" (__value) \
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: "i" (offsetof (struct pthread, 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, \
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4 or 8. */ \
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abort (); \
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\
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asm ("movq %%fs:%P1,%0" \
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: "=r" (__value) \
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: "i" (offsetof (struct pthread, member))); \
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} \
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__value; })
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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, idx) \
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({ __typeof (descr->member[0]) __value; \
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if (sizeof (__value) == 1) \
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asm ("movb %%fs:%P2(%3),%b0" \
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: "=q" (__value) \
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: "0" (0), "i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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else if (sizeof (__value) == 4) \
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asm ("movl %%fs:%P1(,%2,4),%0" \
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: "=r" (__value) \
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: "i" (offsetof (struct pthread, member[0])), "r" (idx)); \
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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, \
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4 or 8. */ \
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abort (); \
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\
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asm ("movq %%fs:%P1(,%2,8),%0" \
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: "=r" (__value) \
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: "i" (offsetof (struct pthread, member[0])), "r" (idx)); \
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} \
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__value; })
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/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
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# define THREAD_SETMEM(descr, member, value) \
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({ if (sizeof (descr->member) == 1) \
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asm volatile ("movb %0,%%fs:%P1" : \
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: "iq" (value), \
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"i" (offsetof (struct pthread, member))); \
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else if (sizeof (descr->member) == 4) \
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asm volatile ("movl %0,%%fs:%P1" : \
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: "ir" (value), \
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"i" (offsetof (struct pthread, member))); \
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else \
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{ \
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if (sizeof (descr->member) != 8) \
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/* There should not be any value with a size other than 1, \
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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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: "ir" ((unsigned long int) value), \
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"i" (offsetof (struct pthread, member))); \
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}})
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/* Set member of the thread descriptor directly. */
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# define THREAD_SETMEM_NC(descr, member, idx, value) \
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({ if (sizeof (descr->member[0]) == 1) \
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asm volatile ("movb %0,%%fs:%P1(%2)" : \
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: "iq" (value), \
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"i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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else if (sizeof (descr->member[0]) == 4) \
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asm volatile ("movl %0,%%fs:%P1(,%2,4)" : \
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: "ir" (value), \
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"i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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else \
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{ \
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if (sizeof (descr->member[0]) != 8) \
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/* There should not be any value with a size other than 1, \
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4 or 8. */ \
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abort (); \
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\
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asm volatile ("movq %0,%%fs:%P1(,%2,8)" : \
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: "r" ((unsigned long int) value), \
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"i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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}})
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#endif /* __ASSEMBLER__ */
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#endif /* tls.h */
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