diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S | 66 |
1 files changed, 57 insertions, 9 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S b/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S index 877ee4c4dc..32742309fb 100644 --- a/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S +++ b/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S @@ -35,38 +35,86 @@ .globl sem_wait .type sem_wait,@function .align 16 + cfi_startproc sem_wait: -3: movl (%rdi), %eax + /* First check for cancellation. */ + movl %fs:CANCELHANDLING, %eax + andl $0xfffffff9, %eax + cmpl $8, %eax + je 4f + + pushq %r12 + cfi_adjust_cfa_offset(8) + cfi_offset(12, -16) + pushq %r13 + cfi_adjust_cfa_offset(8) + movq %rdi, %r13 + cfi_offset(13, -24) + +3: movl (%r13), %eax 2: testl %eax, %eax je 1f leaq -1(%rax), %rdx LOCK - cmpxchgl %edx, (%rdi) + cmpxchgl %edx, (%r13) jne 2b xorl %eax, %eax + popq %r13 + cfi_adjust_cfa_offset(-8) + cfi_restore(13) + popq %r12 + cfi_adjust_cfa_offset(-8) + cfi_restore(12) + retq -1: xorq %r10, %r10 + cfi_adjust_cfa_offset(16) + cfi_offset(12, -16) + cfi_offset(13, -24) +1: call __pthread_enable_asynccancel + movl %eax, %r8d + + xorq %r10, %r10 movq $SYS_futex, %rax + movq %r13, %rdi movq %r10, %rsi movq %r10, %rdx syscall + movq %rax, %r12 + + movl %r8d, %edi + call __pthread_disable_asynccancel - testq %rax, %rax + testq %r12, %r12 je 3b - cmpq $-EWOULDBLOCK, %rax + cmpq $-EWOULDBLOCK, %r12 je 3b - negq %rax + negq %r12 #if USE___THREAD movq errno@gottpoff(%rip), %rdx - movl %eax, %fs:(%rdx) + movl %r12d, %fs:(%rdx) #else - movl %eax, %edx callq __errno_location@plt - movl %edx, (%rax) + movl %r12d, (%rax) #endif orl $-1, %eax + + popq %r13 + cfi_adjust_cfa_offset(-8) + cfi_restore(13) + popq %r12 + cfi_adjust_cfa_offset(-8) + cfi_restore(12) + retq + +4: /* Canceled. */ + movq $0xffffffffffffffff, %fs:RESULT + LOCK + orl $0x10, %fs:CANCELHANDLING + movq %fs:CLEANUP_JMP_BUF, %rdi + jmp __pthread_unwind + cfi_endproc .size sem_wait,.-sem_wait |