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2002-08-01 Roland McGrath <roland@redhat.com>

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* sysdeps/i386/tls.h (TLS_DO_MODIFY_LDT): New macro, broken out of
	TLS_INIT_TP.
	(TLS_DO_SET_THREAD_AREA): New macro, uses thread_set_area syscall.
	(TLS_SETUP_GS_SEGMENT): New macro, try one or the other or both.
	(TLS_INIT_TP): Use that.
This commit is contained in:
Roland McGrath
2002-08-02 03:30:17 +00:00
parent 06c2c536fc
commit ae8f7f19fa
1 changed files with 43 additions and 17 deletions
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60
linuxthreads/sysdeps/i386/tls.h
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@@ -77,16 +77,51 @@ typedef struct
/* Install the dtv pointer. The pointer passed is to the element with /* Install the dtv pointer. The pointer passed is to the element with
index -1 which contain the length. */ index -1 which contain the length. */
# define INSTALL_DTV(descr, dtvp) \ # define INSTALL_DTV(descr, dtvp) \
((tcbhead_t *) descr)->dtv = dtvp + 1 ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
/* Install new dtv for current thread. */ /* Install new dtv for current thread. */
# define INSTALL_NEW_DTV(dtv) \ # define INSTALL_NEW_DTV(dtv) \
({ struct _pthread_descr_struct *__descr; \ ({ struct _pthread_descr_struct *__descr; \
THREAD_SETMEM (__descr, p_header.data.dtvp, dtv); }) THREAD_SETMEM (__descr, p_header.data.dtvp, (dtv)); })
/* Return dtv of given thread descriptor. */ /* Return dtv of given thread descriptor. */
# define GET_DTV(descr) \ # define GET_DTV(descr) \
(((tcbhead_t *) descr)->dtv) (((tcbhead_t *) (descr))->dtv)
# define TLS_DO_MODIFY_LDT(descr, nr) \
({ \
struct modify_ldt_ldt_s ldt_entry = \
{ nr, (unsigned long int) (descr), sizeof (struct _pthread_descr_struct), \
1, 0, 0, 0, 0, 1, 0 }; \
int result; \
asm ("pushl %%ebx\n\t" \
"movl $1, %%ebx\n\t" \
"int $0x80\n\t" \
"popl %%ebx" \
: "=a" (result) \
: "0" (__NR_modify_ldt), "d" (sizeof (ldt_entry)), "c" (&ldt_entry)); \
__builtin_expect (result, 0) != 0 ? -1 : nr * 8 + 7; \
})
# define TLS_DO_SET_THREAD_AREA(descr) \
INLINE_SYSCALL (set_thread_area, 2, descr, 1);
if (__builtin_expect (__seg, 0) == -1)
/* Nothing else we can do. */
asm ("hlt");
__seg;
})
# ifdef __ASSUME_SET_THREAD_AREA_SYSCALL
# define TLS_SETUP_GS_SEGMENT(descr) \
INLINE_SYSCALL (set_thread_area, 2, descr, 1)
# elif defined __NR_set_thread_area
# define TLS_SETUP_GS_SEGMENT(descr) \
({ int __seg = INLINE_SYSCALL (set_thread_area, 2, descr, 1); \
__seg == -1 ? TLS_DO_MODIFY_LDT (descr, 0) : __seg; })
# else
# define TLS_SETUP_GS_SEGMENT(descr) \
TLS_DO_MODIFY_LDT (descr, 0)
# endif
/* Code to initially initialize the thread pointer. This might need /* Code to initially initialize the thread pointer. This might need
special attention since 'errno' is not yet available and if the special attention since 'errno' is not yet available and if the
@@ -94,27 +129,18 @@ typedef struct
# define TLS_INIT_TP(descr) \ # define TLS_INIT_TP(descr) \
do { \ do { \
void *_descr = (descr); \ void *_descr = (descr); \
struct modify_ldt_ldt_s ldt_entry = \
{ 0, (unsigned long int) _descr, 1048576, 1, 0, 0, 1, 0, 1, 0 }; \
int result; \
tcbhead_t *head = _descr; \ tcbhead_t *head = _descr; \
int __gs; \
\ \
head->tcb = _descr; \ head->tcb = _descr; \
/* For now the thread descriptor isat the same address. */ \ /* For now the thread descriptor is at the same address. */ \
head->self = _descr; \ head->self = _descr; \
\ \
asm ("pushl %%ebx\n\t" \ __gs = TLS_SETUP_GS_SEGMENT (_descr); \
"movl $1, %%ebx\n\t" \ if (__builtin_expect (__gs, 7) == -1) \
"int $0x80\n\t" \
"popl %%ebx" \
: "=a" (result) \
: "0" (__NR_modify_ldt), "d" (sizeof (ldt_entry)), "c" (&ldt_entry));\
\
if (__builtin_expect (result, 0) != 0) \
/* Nothing else we can do. */ \ /* Nothing else we can do. */ \
asm ("hlt"); \ asm ("hlt"); \
\ asm ("movw %w0, %%gs" : : "q" (__gs)); \
asm ("movw %w0, %%gs" : : "q" (7)); \
} while (0) } while (0)