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(DO_SET_THREAD_AREA): Don't use INLINE_SYSCALL for set_thread_area syscall.

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This commit is contained in:
Ulrich Drepper 2002-09-29 18:12:30 +00:00
parent f2672dddd1
commit 3ae5121b7f
1 changed files with 31 additions and 11 deletions
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42
linuxthreads/sysdeps/i386/useldt.h
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@ -22,7 +22,6 @@
#ifndef __ASSEMBLER__
#include <stddef.h> /* For offsetof. */
#include <stdlib.h> /* For abort(). */
#include <sysdep.h> /* For INLINE_SYSCALL. */
/* We don't want to include the kernel header. So duplicate the
@ -75,17 +74,25 @@ extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
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
#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) \
# 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)) \
@ -95,8 +102,15 @@ extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
{ (__gs & 0xffff) >> 3, \
(unsigned long int) (descr), 0xfffff /* 4GB in pages */, \
1, 0, 0, 1, 0, 1, 0 }; \
if (__builtin_expect (INLINE_SYSCALL (set_thread_area, 1, &ldt_entry), \
0) == 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; \
@ -107,8 +121,14 @@ extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
{ -1, \
(unsigned long int) (descr), 0xfffff /* 4GB in pages */, \
1, 0, 0, 1, 0, 1, 0 }; \
if (__builtin_expect (INLINE_SYSCALL (set_thread_area, 1, &ldt_entry), \
0) == 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)); \