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1998-08-26 15:46 Ulrich Drepper <drepper@cygnus.com> * internals.h: Define THREAD_GETMEM and THREAD_SETMEM to default if not already defined. (struct _pthread_descr_struct): Add p_self and p_nr field. * manager.c (__pthread_handles): Define second element to point to manager thread. (__pthread_handles_num): Initialize to 2. (__pthread_manager): Use INIT_THREAD_SELF with two arguments. (pthread_start_thread): Likewise. (pthread_handle_create): Start search for free slot at entry 2. Initialize new fields p_self and p_nr. Call __clone with CLONE_PTRACE if available. (pthread_free): Call FREE_THREAD_SELF if available. * pthread.c (__pthread_initial_thread): Initialize new fields. (__pthread_manager_thread): Likewise. (__pthread_initialize_manager): Call __clone with CLONE_PTRACE. * cancel.c: Use THREAD_GETMEM and THREAD_SETMEM to access the elements of the thread descriptor. * condvar.c: Likewise. * errno.c: Likewise. * join.c: Likewise. * manager.c: Likewise. * pthread.c: Likewise. * ptlongjmp.c: Likewise. * semaphore.c: Likewise. * signals.c: Likewise. * specific.c: Likewise. * spinlock.c: Likewise. * sysdeps/alpha/pt-machine.h (INIT_THREAD_SELF): Add extra parameter. * sysdeps/i386/useldt.h: New file. * sysdeps/i386/i686/pt-machine.h: Show how to use this file. * sysdeps/sparc/sparc32/pt-machine.h: Define THREAD_GETMEM and THREAD_SETMEM using __thread_self. * sysdeps/sparc/sparc64/pt-machine.h: Likewise.
125 lines
4.4 KiB
C
125 lines
4.4 KiB
C
/* Special definitions for ix86 machine using segment register based
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thread descriptor.
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Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stddef.h> /* For offsetof. */
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/* We don't want to include the kernel header. So duplicate the
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information. */
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/* Structure passed on `modify_ldt' call. */
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struct modify_ldt_ldt_s
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{
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unsigned int entry_number;
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unsigned long int base_addr;
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unsigned int limit;
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unsigned int seg_32bit:1;
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unsigned int contents:2;
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unsigned int read_exec_only:1;
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unsigned int limit_in_pages:1;
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unsigned int seg_not_present:1;
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unsigned int useable:1;
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unsigned int empty:25;
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};
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/* System call to set LDT entry. */
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extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
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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__ ("movl %%gs:%c1,%0" : "=r" (__self) \
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: "i" (offsetof (struct _pthread_descr_struct, p_self))); \
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__self; \
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})
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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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struct modify_ldt_ldt_s ldt_entry = \
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{ nr, (unsigned long int) descr, sizeof (*descr), 1, 0, 0, 0, 0, 1, 0 }; \
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if (__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) \
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abort (); \
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__asm__ __volatile__ ("movw %w0, %%gs" : : "r" (nr * 8 + 7)); \
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}
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/* Free resources associated with thread descriptor. */
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#define FREE_THREAD_SELF(descr, nr) \
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{ \
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struct modify_ldt_ldt_s ldt_entry = \
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{ nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 }; \
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__asm__ __volatile__ ("movw %w0,%%gs" : : "r" (0)); \
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__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)); \
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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 %%gs:%c1,%b0" \
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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) != 4) \
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/* There should not be any value with a size other than 1 or 4. */ \
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abort (); \
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\
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__asm__ __volatile__ ("movl %%gs:%c1,%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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/* 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,%%gs:%c1" : \
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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) != 4) \
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/* There should not be any value with a size other than 1 or 4. */ \
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abort (); \
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\
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__asm__ __volatile__ ("movl %0,%%gs:%c1" : \
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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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