diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/i386/pthread_once.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/pthread_once.S | 93 |
1 files changed, 52 insertions, 41 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/pthread_once.S b/nptl/sysdeps/unix/sysv/linux/i386/pthread_once.S index 8d3deb88f8..3bab92f990 100644 --- a/nptl/sysdeps/unix/sysv/linux/i386/pthread_once.S +++ b/nptl/sysdeps/unix/sysv/linux/i386/pthread_once.S @@ -17,6 +17,7 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ +#include <unwindbuf.h> #include <sysdep.h> #ifndef UP @@ -36,6 +37,7 @@ .globl __pthread_once .type __pthread_once,@function .align 16 + cfi_startproc __pthread_once: movl 4(%esp), %ecx testl $2, (%ecx) @@ -44,7 +46,11 @@ __pthread_once: ret 1: pushl %ebx + cfi_adjust_cfa_offset (4) + cfi_rel_offset (3, 0) pushl %esi + cfi_adjust_cfa_offset (4) + cfi_rel_offset (6, 0) movl %ecx, %ebx xorl %esi, %esi @@ -90,33 +96,35 @@ __pthread_once: jmp 6b 3: /* Call the initializer function after setting up the - cancellation handler. */ - subl $16, %esp - - /* Push the cleanup handler. */ -#ifdef PIC - leal clear_once_control@GOTOFF(%ecx), %eax -#else - leal clear_once_control, %eax -#endif - movl %esp, %edx - pushl %ebx - pushl %eax - pushl %edx - call __pthread_cleanup_push /* Note: no @PLT. */ - - call *44(%esp) - - /* Pop the cleanup handler. This code depends on the once - handler and _pthread_cleanup_push not touch the content - of the stack. Otherwise the first parameter would have - to be reloaded. */ + cancellation handler. Note that it is not possible here + to use the unwind-based cleanup handling. This would require + that the user-provided function and all the code it calls + is compiled with exceptions. Unfortunately this cannot be + guaranteed. */ + subl $UNWINDBUFSIZE+8, %esp + cfi_adjust_cfa_offset (UNWINDBUFSIZE+8) + movl %ecx, %ebx /* PIC register value. */ + + leal 8+UWJMPBUF(%esp), %eax movl $0, 4(%esp) - call __pthread_cleanup_pop /* Note: no @PLT. */ + movl %eax, (%esp) + call __sigsetjmp@PLT + jne 7f - addl $28, %esp + leal 8(%esp), %eax + call __pthread_register_cancel + + /* Call the user-provided initialization function. */ + call *24+UNWINDBUFSIZE(%esp) + + /* Pop the cleanup handler. */ + leal 8(%esp), %eax + call __pthread_unregister_cancel + addl $UNWINDBUFSIZE+8, %esp + cfi_adjust_cfa_offset (-UNWINDBUFSIZE-8) /* Sucessful run of the initializer. Signal that we are done. */ + movl 12(%esp), %ebx LOCK addl $1, (%ebx) @@ -127,25 +135,19 @@ __pthread_once: ENTER_KERNEL 4: popl %esi + cfi_adjust_cfa_offset (-4) + cfi_restore (6) popl %ebx + cfi_adjust_cfa_offset (-4) + cfi_restore (3) xorl %eax, %eax ret - .size __pthread_once,.-__pthread_once - - .globl __pthread_once_internal -__pthread_once_internal = __pthread_once - - .globl pthread_once -pthread_once = __pthread_once - - - .type clear_once_control,@function - .align 16 -clear_once_control: - pushl %ebx - - movl 8(%esp), %ebx +7: /* __sigsetjmp returned for the second time. */ + movl 20+UNWINDBUFSIZE(%esp), %ebx + cfi_adjust_cfa_offset (UNWINDBUFSIZE+16) + cfi_offset (3, -8) + cfi_offset (6, -12) movl $0, (%ebx) movl $0x7fffffff, %edx @@ -153,9 +155,18 @@ clear_once_control: movl $SYS_futex, %eax ENTER_KERNEL - popl %ebx - ret - .size clear_once_control,.-clear_once_control + leal 8(%esp), %eax + call __pthread_unwind_next /* Note: no @PLT. */ + /* NOTREACHED */ + hlt + cfi_endproc + .size __pthread_once,.-__pthread_once + + .globl __pthread_once_internal +__pthread_once_internal = __pthread_once + + .globl pthread_once +pthread_once = __pthread_once #ifdef PIC |