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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
index -1 which contain the length. */
# define INSTALL_DTV(descr, dtvp) \
((tcbhead_t *) descr)->dtv = dtvp + 1
((tcbhead_t *) (descr))->dtv = (dtvp) + 1
/* Install new dtv for current thread. */
# define INSTALL_NEW_DTV(dtv) \
({ 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. */
# 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
special attention since 'errno' is not yet available and if the
@ -94,27 +129,18 @@ typedef struct
# define TLS_INIT_TP(descr) \
do { \
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; \
int __gs; \
\
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; \
\
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));\
\
if (__builtin_expect (result, 0) != 0) \
__gs = TLS_SETUP_GS_SEGMENT (_descr); \
if (__builtin_expect (__gs, 7) == -1) \
/* Nothing else we can do. */ \
asm ("hlt"); \
\
asm ("movw %w0, %%gs" : : "q" (7)); \
asm ("movw %w0, %%gs" : : "q" (__gs)); \
} while (0)