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Diffstat (limited to 'libpthread/linuxthreads/sysdeps/i386/useldt.h')
-rw-r--r--libpthread/linuxthreads/sysdeps/i386/useldt.h213
1 files changed, 175 insertions, 38 deletions
diff --git a/libpthread/linuxthreads/sysdeps/i386/useldt.h b/libpthread/linuxthreads/sysdeps/i386/useldt.h
index 1a789e2e0..16aee9989 100644
--- a/libpthread/linuxthreads/sysdeps/i386/useldt.h
+++ b/libpthread/linuxthreads/sysdeps/i386/useldt.h
@@ -1,29 +1,31 @@
/* Special definitions for ix86 machine using segment register based
thread descriptor.
- Copyright (C) 1998 Free Software Foundation, Inc.
+ Copyright (C) 1998, 2000, 2001, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>.
The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
+ modify it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
+ You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ Boston, MA 02111-1307, USA. */
+#ifndef __ASSEMBLER__
#include <stddef.h> /* For offsetof. */
+#include <stdlib.h> /* For abort(). */
-/* We don't want to include the kernel header. So duplicate the
- information. */
+/* We don't want to include the kernel header. So duplicate the
+ information. */
/* Structure passed on `modify_ldt' call. */
struct modify_ldt_ldt_s
@@ -54,28 +56,128 @@ extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
({ \
register pthread_descr __self; \
__asm__ ("movl %%gs:%c1,%0" : "=r" (__self) \
- : "i" (offsetof (struct _pthread_descr_struct, p_self))); \
+ : "i" (offsetof (struct _pthread_descr_struct, \
+ p_header.data.self))); \
__self; \
})
-/* Initialize the thread-unique value. */
-#define INIT_THREAD_SELF(descr, nr) \
-{ \
+
+/* Initialize the thread-unique value. Two possible ways to do it. */
+
+#define DO_MODIFY_LDT(descr, nr) \
+({ \
struct modify_ldt_ldt_s ldt_entry = \
- { nr, (unsigned long int) descr, sizeof (*descr), 1, 0, 0, 0, 0, 1, 0 }; \
+ { nr, (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \
+ 1, 0, 0, 1, 0, 1, 0 }; \
if (__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) \
abort (); \
- __asm__ __volatile__ ("movw %w0, %%gs" : : "r" (nr * 8 + 7)); \
-}
+ asm ("movw %w0, %%gs" : : "q" (nr * 8 + 7)); \
+})
+
+#ifdef __PIC__
+# define USETLS_EBX_ARG "r"
+# define USETLS_LOAD_EBX "xchgl %3, %%ebx\n\t"
+#else
+# define USETLS_EBX_ARG "b"
+# define USETLS_LOAD_EBX
+#endif
+
+/* When using the new set_thread_area call, we don't need to change %gs
+ because we inherited the value set up in the main thread by TLS setup.
+ We need to extract that value and set up the same segment in this
+ thread. */
+#if USE_TLS
+# define DO_SET_THREAD_AREA_REUSE(nr) 1
+#else
+/* Without TLS, we do the initialization of the main thread, where NR == 0. */
+# define DO_SET_THREAD_AREA_REUSE(nr) (!__builtin_constant_p (nr) || (nr))
+#endif
+#define DO_SET_THREAD_AREA(descr, nr) \
+({ \
+ int __gs; \
+ if (DO_SET_THREAD_AREA_REUSE (nr)) \
+ { \
+ asm ("movw %%gs, %w0" : "=q" (__gs)); \
+ struct modify_ldt_ldt_s ldt_entry = \
+ { (__gs & 0xffff) >> 3, \
+ (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \
+ 1, 0, 0, 1, 0, 1, 0 }; \
+ \
+ int __result; \
+ __asm (USETLS_LOAD_EBX \
+ "movl %2, %%eax\n\t" \
+ "int $0x80\n\t" \
+ USETLS_LOAD_EBX \
+ : "&a" (__result) \
+ : USETLS_EBX_ARG (&ldt_entry), "i" (__NR_set_thread_area)); \
+ if (__result == 0) \
+ asm ("movw %w0, %%gs" :: "q" (__gs)); \
+ else \
+ __gs = -1; \
+ } \
+ else \
+ { \
+ struct modify_ldt_ldt_s ldt_entry = \
+ { -1, \
+ (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \
+ 1, 0, 0, 1, 0, 1, 0 }; \
+ int __result; \
+ __asm (USETLS_LOAD_EBX \
+ "movl %2, %%eax\n\t" \
+ "int $0x80\n\t" \
+ USETLS_LOAD_EBX \
+ : "&a" (__result) \
+ : USETLS_EBX_ARG (&ldt_entry), "i" (__NR_set_thread_area)); \
+ if (__result == 0) \
+ { \
+ __gs = (ldt_entry.entry_number << 3) + 3; \
+ asm ("movw %w0, %%gs" : : "q" (__gs)); \
+ } \
+ else \
+ __gs = -1; \
+ } \
+ __gs; \
+})
+
+#if defined __ASSUME_SET_THREAD_AREA_SYSCALL
+# define INIT_THREAD_SELF(descr, nr) DO_SET_THREAD_AREA (descr, nr)
+#elif defined __NR_set_thread_area
+# define INIT_THREAD_SELF(descr, nr) \
+({ \
+ if (__builtin_expect (__have_no_set_thread_area, 0) \
+ || (DO_SET_THREAD_AREA (descr, DO_SET_THREAD_AREA_REUSE (nr)) == -1 \
+ && (__have_no_set_thread_area = 1))) \
+ DO_MODIFY_LDT (descr, nr); \
+})
+/* Defined in pspinlock.c. */
+extern int __have_no_set_thread_area;
+#else
+# define INIT_THREAD_SELF(descr, nr) DO_MODIFY_LDT (descr, nr)
+#endif
/* Free resources associated with thread descriptor. */
-#define FREE_THREAD_SELF(descr, nr) \
+#ifdef __ASSUME_SET_THREAD_AREA_SYSCALL
+#define FREE_THREAD(descr, nr) do { } while (0)
+#elif defined __NR_set_thread_area
+#define FREE_THREAD(descr, nr) \
+{ \
+ int __gs; \
+ __asm__ __volatile__ ("movw %%gs, %w0" : "=q" (__gs)); \
+ if (__builtin_expect (__gs & 4, 0)) \
+ { \
+ struct modify_ldt_ldt_s ldt_entry = \
+ { nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 }; \
+ __modify_ldt (1, &ldt_entry, sizeof (ldt_entry)); \
+ } \
+}
+#else
+#define FREE_THREAD(descr, nr) \
{ \
struct modify_ldt_ldt_s ldt_entry = \
{ nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 }; \
- __asm__ __volatile__ ("movw %w0,%%gs" : : "r" (0)); \
__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)); \
}
+#endif
/* Read member of the thread descriptor directly. */
#define THREAD_GETMEM(descr, member) \
@@ -83,20 +185,28 @@ extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
__typeof__ (descr->member) __value; \
if (sizeof (__value) == 1) \
__asm__ __volatile__ ("movb %%gs:%P2,%b0" \
- : "=r" (__value) \
+ : "=q" (__value) \
: "0" (0), \
"i" (offsetof (struct _pthread_descr_struct, \
member))); \
+ else if (sizeof (__value) == 4) \
+ __asm__ __volatile__ ("movl %%gs:%P1,%0" \
+ : "=r" (__value) \
+ : "i" (offsetof (struct _pthread_descr_struct, \
+ member))); \
else \
{ \
- if (sizeof (__value) != 4) \
- /* There should not be any value with a size other than 1 or 4. */ \
+ if (sizeof (__value) != 8) \
+ /* There should not be any value with a size other than 1, 4 or 8. */\
abort (); \
\
- __asm__ __volatile__ ("movl %%gs:%P1,%0" \
- : "=r" (__value) \
+ __asm__ __volatile__ ("movl %%gs:%P1,%%eax\n\t" \
+ "movl %%gs:%P2,%%edx" \
+ : "=A" (__value) \
: "i" (offsetof (struct _pthread_descr_struct, \
- member))); \
+ member)), \
+ "i" (offsetof (struct _pthread_descr_struct, \
+ member) + 4)); \
} \
__value; \
})
@@ -107,18 +217,24 @@ extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
__typeof__ (descr->member) __value; \
if (sizeof (__value) == 1) \
__asm__ __volatile__ ("movb %%gs:(%2),%b0" \
- : "=r" (__value) \
+ : "=q" (__value) \
: "0" (0), \
"r" (offsetof (struct _pthread_descr_struct, \
member))); \
+ else if (sizeof (__value) == 4) \
+ __asm__ __volatile__ ("movl %%gs:(%1),%0" \
+ : "=r" (__value) \
+ : "r" (offsetof (struct _pthread_descr_struct, \
+ member))); \
else \
{ \
- if (sizeof (__value) != 4) \
- /* There should not be any value with a size other than 1 or 4. */ \
+ if (sizeof (__value) != 8) \
+ /* There should not be any value with a size other than 1, 4 or 8. */\
abort (); \
\
- __asm__ __volatile__ ("movl %%gs:(%1),%0" \
- : "=r" (__value) \
+ __asm__ __volatile__ ("movl %%gs:(%1),%%eax\n\t" \
+ "movl %%gs:4(%1),%%edx" \
+ : "=&A" (__value) \
: "r" (offsetof (struct _pthread_descr_struct, \
member))); \
} \
@@ -131,19 +247,27 @@ extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
__typeof__ (descr->member) __value = (value); \
if (sizeof (__value) == 1) \
__asm__ __volatile__ ("movb %0,%%gs:%P1" : \
+ : "q" (__value), \
+ "i" (offsetof (struct _pthread_descr_struct, \
+ member))); \
+ else if (sizeof (__value) == 4) \
+ __asm__ __volatile__ ("movl %0,%%gs:%P1" : \
: "r" (__value), \
"i" (offsetof (struct _pthread_descr_struct, \
member))); \
else \
{ \
- if (sizeof (__value) != 4) \
- /* There should not be any value with a size other than 1 or 4. */ \
+ if (sizeof (__value) != 8) \
+ /* There should not be any value with a size other than 1, 4 or 8. */\
abort (); \
\
- __asm__ __volatile__ ("movl %0,%%gs:%P1" : \
- : "r" (__value), \
+ __asm__ __volatile__ ("movl %%eax,%%gs:%P1\n\n" \
+ "movl %%edx,%%gs:%P2" : \
+ : "A" (__value), \
"i" (offsetof (struct _pthread_descr_struct, \
- member))); \
+ member)), \
+ "i" (offsetof (struct _pthread_descr_struct, \
+ member) + 4)); \
} \
})
@@ -153,18 +277,31 @@ extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
__typeof__ (descr->member) __value = (value); \
if (sizeof (__value) == 1) \
__asm__ __volatile__ ("movb %0,%%gs:(%1)" : \
+ : "q" (__value), \
+ "r" (offsetof (struct _pthread_descr_struct, \
+ member))); \
+ else if (sizeof (__value) == 4) \
+ __asm__ __volatile__ ("movl %0,%%gs:(%1)" : \
: "r" (__value), \
"r" (offsetof (struct _pthread_descr_struct, \
member))); \
else \
{ \
- if (sizeof (__value) != 4) \
- /* There should not be any value with a size other than 1 or 4. */ \
+ if (sizeof (__value) != 8) \
+ /* There should not be any value with a size other than 1, 4 or 8. */\
abort (); \
\
- __asm__ __volatile__ ("movl %0,%%gs:(%1)" : \
- : "r" (__value), \
+ __asm__ __volatile__ ("movl %%eax,%%gs:(%1)\n\t" \
+ "movl %%edx,%%gs:4(%1)" : \
+ : "A" (__value), \
"r" (offsetof (struct _pthread_descr_struct, \
member))); \
} \
})
+#endif
+
+/* We want the OS to assign stack addresses. */
+#define FLOATING_STACKS 1
+
+/* Maximum size of the stack if the rlimit is unlimited. */
+#define ARCH_STACK_MAX_SIZE 8*1024*1024