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78ce5a3bbb
2002-07-24 Ulrich Drepper <drepper@redhat.com> * libio/fileops.c (_IO_file_seekoff_mmap): Do use fp->_offset to compute current position. * stdio-common/tst-fseek.c (main): Improve error messages. * libio/tst-freopen.c (main): Remove unused variable. * libio/fileops.c (_IO_file_seekoff_mmap): Set fp->_offset after succesful seek call. Simply error checking. 2002-07-25 Jakub Jelinek <jakub@redhat.com> * config.h.in: Use __ASSEMBLER__ test macro not ASSEMBLER. * sysdeps/ia64/fpu/libm_support.h: Likewise.
130 lines
4.1 KiB
C
130 lines
4.1 KiB
C
/* Definition for thread-local data handling. linuxthreads/i386 version.
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Copyright (C) 2002 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
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# include <pt-machine.h>
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#ifndef __ASSEMBLER__
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# include <stddef.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 can support TLS only if the floating-stack support is available. */
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#if defined FLOATING_STACKS && defined HAVE_TLS_SUPPORT
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/* Signal that TLS support is available. */
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# define USE_TLS 1
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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 <linuxthreads/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_descr_struct)
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/* Alignment requirements for the TCB. */
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# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
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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(dtv) \
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({ struct _pthread_descr_struct *__descr; \
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THREAD_SETMEM (__descr, p_header.data.dtvp, dtv); })
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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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/* 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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# define TLS_INIT_TP(descr) \
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do { \
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void *_descr = (descr); \
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struct modify_ldt_ldt_s ldt_entry = \
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{ 0, (unsigned long int) _descr, 1048576, 1, 0, 0, 1, 0, 1, 0 }; \
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int result; \
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tcbhead_t *head = _descr; \
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\
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head->tcb = _descr; \
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/* For now the thread descriptor isat the same address. */ \
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head->self = _descr; \
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\
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asm ("pushl %%ebx\n\t" \
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"movl $1, %%ebx\n\t" \
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"int $0x80\n\t" \
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"popl %%ebx" \
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: "=a" (result) \
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: "0" (__NR_modify_ldt), "d" (sizeof (ldt_entry)), "c" (&ldt_entry));\
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\
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if (__builtin_expect (result, 0) != 0) \
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/* Nothing else we can do. */ \
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asm ("hlt"); \
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\
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asm ("movw %w0, %%gs" : : "q" (7)); \
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} while (0)
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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_descr_struct *__descr; \
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THREAD_GETMEM (__descr, p_header.data.dtvp); })
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# endif /* FLOATING_STACKS && HAVE_TLS_SUPPORT */
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#endif /* __ASSEMBLER__ */
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#endif /* tls.h */
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