diff options
Diffstat (limited to 'linuxthreads/sysdeps/i386/tls.h')
| -rw-r--r-- | linuxthreads/sysdeps/i386/tls.h | 47 |
1 files changed, 23 insertions, 24 deletions
diff --git a/linuxthreads/sysdeps/i386/tls.h b/linuxthreads/sysdeps/i386/tls.h index 8bbe5f28e6..c244801bf4 100644 --- a/linuxthreads/sysdeps/i386/tls.h +++ b/linuxthreads/sysdeps/i386/tls.h @@ -106,20 +106,18 @@ typedef struct # endif # if __ASSUME_LDT_WORKS > 0 -# define TLS_DO_MODIFY_LDT_KERNEL_CHECK /* Nothing to do. */ +# define TLS_DO_MODIFY_LDT_KERNEL_CHECK(doit) (doit) /* Nothing to check. */ # else # include "useldt.h" /* For the structure. */ -# define TLS_DO_MODIFY_LDT_KERNEL_CHECK \ - if (__builtin_expect (GL(dl_osversion) < 131939, 0)) \ - _dl_fatal_printf ("kernel %u.%u.%u cannot support thread-local storage\n",\ - (GL(dl_osversion) >> 16) & 0xff, \ - (GL(dl_osversion) >> 8) & 0xff, \ - (GL(dl_osversion) >> 0) & 0xff); +# define TLS_DO_MODIFY_LDT_KERNEL_CHECK(doit) \ + (__builtin_expect (GL(dl_osversion) < 131939, 0) \ + ? "kernel too old for thread-local storage support" \ + : (doit)) # endif # define TLS_DO_MODIFY_LDT(descr, nr) \ +TLS_DO_MODIFY_LDT_KERNEL_CHECK( \ ({ \ - TLS_DO_MODIFY_LDT_KERNEL_CHECK \ struct modify_ldt_ldt_s ldt_entry = \ { nr, (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ 1, 0, 0, 1, 0, 1, 0 }; \ @@ -134,8 +132,10 @@ typedef struct here. */ \ "m" (ldt_entry), TLS_EBX_ARG (1), "c" (&ldt_entry), \ "d" (sizeof (ldt_entry))); \ - __builtin_expect (result, 0) != 0 ? -1 : nr * 8 + 7; \ -}) + __builtin_expect (result, 0) == 0 \ + ? ({ asm ("movw %w0, %%gs" : : "q" ((nr) * 8 + 7)); NULL; }) \ + : "cannot set up LDT for thread-local storage"; \ +})) # define TLS_DO_SET_THREAD_AREA(descr, secondcall) \ ({ \ @@ -156,41 +156,40 @@ typedef struct to let the compiler know that we are accessing LDT_ENTRY \ here. */ \ TLS_EBX_ARG (&ldt_entry), "m" (ldt_entry)); \ - __builtin_expect (result, 0) == 0 ? ldt_entry.entry_number * 8 + 3 : -1; \ + if (__builtin_expect (result, 0) == 0) \ + asm ("movw %w0, %%gs" : : "q" (ldt_entry.entry_number * 8 + 3)); \ + result; \ }) # ifdef __ASSUME_SET_THREAD_AREA_SYSCALL -# define TLS_SETUP_GS_SEGMENT(descr, secondcall) \ - TLS_DO_SET_THREAD_AREA (descr, firstcall) +# define TLS_SETUP_GS_SEGMENT(descr, secondcall) \ + (TLS_DO_SET_THREAD_AREA (descr, firstcall) \ + ? "set_thread_area failed when setting up thread-local storage" : NULL) # elif defined __NR_set_thread_area # define TLS_SETUP_GS_SEGMENT(descr, secondcall) \ - ({ int __seg = TLS_DO_SET_THREAD_AREA (descr, secondcall); \ - __seg == -1 ? TLS_DO_MODIFY_LDT (descr, 0) : __seg; }) + (TLS_DO_SET_THREAD_AREA (descr, secondcall) \ + ? TLS_DO_MODIFY_LDT (descr, 0) : NULL) # else # define TLS_SETUP_GS_SEGMENT(descr, secondcall) \ 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 - operation can cause a failure 'errno' must not be touched. */ + operation can cause a failure 'errno' must not be touched. + + The value of this macro is null if successful, or an error string. */ # define TLS_INIT_TP(descr, secondcall) \ ({ \ void *_descr = (descr); \ tcbhead_t *head = _descr; \ - int __gs; \ \ head->tcb = _descr; \ /* For now the thread descriptor is at the same address. */ \ head->self = _descr; \ \ - __gs = TLS_SETUP_GS_SEGMENT (_descr, secondcall); \ - if (__builtin_expect (__gs, 7) != -1) \ - { \ - asm ("movw %w0, %%gs" : : "q" (__gs)); \ - __gs = 0; \ - } \ - __gs; \ + TLS_SETUP_GS_SEGMENT (_descr, secondcall); \ }) |