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authorRoland McGrath <roland@gnu.org>2002-08-02 03:30:17 +0000
committerRoland McGrath <roland@gnu.org>2002-08-02 03:30:17 +0000
commitae8f7f19faf701667d5e88195e3efc479c4a0746 (patch)
treecb4cb8f993b9e202e2a8f977d58ff7d2773e539f /linuxthreads
parent06c2c536fce6de5da0b241fafb8cdef14fc2766a (diff)
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2002-08-01 Roland McGrath <roland@redhat.com>
* 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.
Diffstat (limited to 'linuxthreads')
-rw-r--r--linuxthreads/sysdeps/i386/tls.h60
1 files changed, 43 insertions, 17 deletions
diff --git a/linuxthreads/sysdeps/i386/tls.h b/linuxthreads/sysdeps/i386/tls.h
index 24671db..b49543d 100644
--- a/linuxthreads/sysdeps/i386/tls.h
+++ b/linuxthreads/sysdeps/i386/tls.h
@@ -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)