288 lines
10 KiB
C
288 lines
10 KiB
C
/* Special definitions for ix86 machine using segment register based
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thread descriptor.
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Copyright (C) 1998, 2000, 2001, 2002 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 Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 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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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; 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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#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 <sysdep.h> /* For INLINE_SYSCALL. */
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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, \
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p_header.data.self))); \
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__self; \
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})
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/* Initialize the thread-unique value. Two possible ways to do it. */
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#define DO_MODIFY_LDT(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 (struct _pthread_descr_struct), \
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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 ("movw %w0, %%gs" : : "q" (nr * 8 + 7)); \
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})
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/* When using the new set_thread_area call, we don't need to change %gs
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because we inherited the value set up in the main thread by TLS setup.
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We need to extract that value and set up the same segment in this
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thread. */
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# if USE_TLS
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# define DO_SET_THREAD_AREA_REUSE(nr) 1
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# else
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/* Without TLS, we do the initialization of the main thread, where NR == 0. */
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# define DO_SET_THREAD_AREA_REUSE(nr) (!__builtin_constant_p (nr) || (nr))
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# endif
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# define DO_SET_THREAD_AREA(descr, nr) \
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({ \
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int __gs; \
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if (DO_SET_THREAD_AREA_REUSE (nr)) \
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{ \
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asm ("movw %%gs, %w0" : "=q" (__gs)); \
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struct modify_ldt_ldt_s ldt_entry = \
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{ (__gs & 0xffff) >> 3, \
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(unsigned long int) descr, sizeof (struct _pthread_descr_struct), \
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1, 0, 0, 0, 0, 1, 0 }; \
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if (__builtin_expect (INLINE_SYSCALL (set_thread_area, 1, &ldt_entry), \
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0) == 0) \
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asm ("movw %w0, %%gs" :: "q" (__gs)); \
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else \
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__gs = -1; \
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} \
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else \
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{ \
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struct modify_ldt_ldt_s ldt_entry = \
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{ -1, \
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(unsigned long int) descr, sizeof (struct _pthread_descr_struct), \
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1, 0, 0, 0, 0, 1, 0 }; \
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if (__builtin_expect (INLINE_SYSCALL (set_thread_area, 1, &ldt_entry), \
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0) == 0) \
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{ \
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__gs = (ldt_entry.entry_number << 3) + 3; \
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asm ("movw %w0, %%gs" : : "q" (__gs)); \
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} \
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else \
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__gs = -1; \
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} \
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__gs; \
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})
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#if defined __ASSUME_SET_THREAD_AREA_SYSCALL
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# define INIT_THREAD_SELF(descr, nr) DO_SET_THREAD_AREA (descr, nr)
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#elif defined __NR_set_thread_area
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# define INIT_THREAD_SELF(descr, nr) \
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({ \
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if (__builtin_expect (__have_no_set_thread_area, 0) \
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|| (DO_SET_THREAD_AREA (descr, DO_SET_THREAD_AREA_REUSE (nr)) == -1 \
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&& (__have_no_set_thread_area = 1))) \
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DO_MODIFY_LDT (descr, nr); \
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})
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/* Defined in pspinlock.c. */
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extern int __have_no_set_thread_area;
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#else
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# define INIT_THREAD_SELF(descr, nr) DO_MODIFY_LDT (descr, nr)
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#endif
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/* Free resources associated with thread descriptor. */
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#ifdef __ASSUME_SET_THREAD_AREA_SYSCALL
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#define FREE_THREAD(descr, nr) do { } while (0)
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#elif defined __NR_set_thread_area
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#define FREE_THREAD(descr, nr) \
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{ \
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int __gs; \
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__asm__ __volatile__ ("movw %%gs, %w0" : "=q" (__gs)); \
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if (__builtin_expect (__gs & 4, 0)) \
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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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__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)); \
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} \
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}
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#else
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#define FREE_THREAD(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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__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)); \
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}
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#endif
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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:%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 %%gs:%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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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__ ("movl %%gs:%P1,%%eax\n\t" \
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"movl %%gs:%P2,%%edx" \
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: "=A" (__value) \
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: "i" (offsetof (struct _pthread_descr_struct, \
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member)), \
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"i" (offsetof (struct _pthread_descr_struct, \
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member) + 4)); \
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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 %%gs:(%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 %%gs:(%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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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__ ("movl %%gs:(%1),%%eax\n\t" \
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"movl %%gs:4(%1),%%edx" \
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: "=&A" (__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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/* 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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({ \
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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:%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 %0,%%gs:%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__ ("movl %%eax,%%gs:%P1\n\n" \
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"movl %%edx,%%gs:%P2" : \
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: "A" (__value), \
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"i" (offsetof (struct _pthread_descr_struct, \
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member)), \
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"i" (offsetof (struct _pthread_descr_struct, \
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member) + 4)); \
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} \
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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, 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:(%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 %0,%%gs:(%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__ ("movl %%eax,%%gs:(%1)\n\t" \
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"movl %%edx,%%gs:4(%1)" : \
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: "A" (__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
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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 8*1024*1024
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