diff options
Diffstat (limited to 'linuxthreads/sysdeps/i386/tls.h')
| -rw-r--r-- | linuxthreads/sysdeps/i386/tls.h | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/linuxthreads/sysdeps/i386/tls.h b/linuxthreads/sysdeps/i386/tls.h index 5de8eca18d..098b11caa0 100644 --- a/linuxthreads/sysdeps/i386/tls.h +++ b/linuxthreads/sysdeps/i386/tls.h @@ -115,12 +115,16 @@ typedef struct __builtin_expect (result, 0) != 0 ? -1 : nr * 8 + 7; \ }) -# define TLS_DO_SET_THREAD_AREA(descr) \ +# define TLS_DO_SET_THREAD_AREA(descr, firstcall) \ ({ \ struct modify_ldt_ldt_s ldt_entry = \ { -1, (unsigned long int) (descr), sizeof (struct _pthread_descr_struct), \ 1, 0, 0, 0, 0, 1, 0 }; \ int result; \ + if (!firstcall) \ + ldt_entry.entry_number = ({ int _gs; \ + asm ("movw %%gs, %w0" : "=q" (_gs)); \ + (_gs & 0xffff) >> 3; }); \ asm volatile (TLS_LOAD_EBX \ "int $0x80\n\t" \ TLS_LOAD_EBX \ @@ -134,10 +138,11 @@ typedef struct }) # ifdef __ASSUME_SET_THREAD_AREA_SYSCALL -# define TLS_SETUP_GS_SEGMENT(descr) TLS_DO_SET_THREAD_AREA (descr) +# define TLS_SETUP_GS_SEGMENT(descr, firstcall) \ + TLS_DO_SET_THREAD_AREA (descr, firstcall) # elif defined __NR_set_thread_area -# define TLS_SETUP_GS_SEGMENT(descr) \ - ({ int __seg = TLS_DO_SET_THREAD_AREA (descr); \ +# define TLS_SETUP_GS_SEGMENT(descr, firstcall) \ + ({ int __seg = TLS_DO_SET_THREAD_AREA (descr, firstcall); \ __seg == -1 ? TLS_DO_MODIFY_LDT (descr, 0) : __seg; }) # else # define TLS_SETUP_GS_SEGMENT(descr) TLS_DO_MODIFY_LDT ((descr), 0) @@ -146,7 +151,7 @@ typedef struct /* Code to initially initialize the thread pointer. This might need special attention since 'errno' is not yet available and if the operation can cause a failure 'errno' must not be touched. */ -# define TLS_INIT_TP(descr) \ +# define TLS_INIT_TP(descr, firstcall) \ ({ \ void *_descr = (descr); \ tcbhead_t *head = _descr; \ @@ -156,7 +161,7 @@ typedef struct /* For now the thread descriptor is at the same address. */ \ head->self = _descr; \ \ - __gs = TLS_SETUP_GS_SEGMENT (_descr); \ + __gs = TLS_SETUP_GS_SEGMENT (_descr, firstcall); \ if (__builtin_expect (__gs, 7) != -1) \ { \ asm ("movw %w0, %%gs" : : "q" (__gs)); \ |