diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S | 187 |
1 files changed, 125 insertions, 62 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S index c2f94d47f..73d1d1633 100644 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S @@ -1,4 +1,4 @@ -/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc. +/* Copyright (C) 2002, 2003, 2005, 2007, 2009 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. @@ -18,15 +18,9 @@ 02111-1307 USA. */ #include <sysdep.h> +#include <lowlevellock.h> #include <pthread-errnos.h> -#include <tcb-offsets.h> -#include <tls.h> - -#ifndef UP -# define LOCK lock -#else -# define -#endif +#include <structsem.h> .text @@ -34,86 +28,155 @@ .globl sem_wait .type sem_wait,@function .align 16 - cfi_startproc sem_wait: - /* 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) +.LSTARTCODE: + cfi_startproc +#ifdef SHARED + cfi_personality(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect, + DW.ref.__gcc_personality_v0) + cfi_lsda(DW_EH_PE_pcrel | DW_EH_PE_sdata4, .LexceptSTART) +#else + cfi_personality(DW_EH_PE_udata4, __gcc_personality_v0) + cfi_lsda(DW_EH_PE_udata4, .LexceptSTART) +#endif -3: movl (%r13), %eax +#if VALUE == 0 + movl (%rdi), %eax +#else + movl VALUE(%rdi), %eax +#endif 2: testl %eax, %eax je 1f - leaq -1(%rax), %rdx + leal -1(%rax), %edx LOCK - cmpxchgl %edx, (%r13) +#if VALUE == 0 + cmpxchgl %edx, (%rdi) +#else + cmpxchgl %edx, VALUE(%rdi) +#endif jne 2b + xorl %eax, %eax + retq - popq %r13 - cfi_adjust_cfa_offset(-8) - cfi_restore(13) - popq %r12 - cfi_adjust_cfa_offset(-8) - cfi_restore(12) + /* This push is only needed to store the sem_t pointer for the + exception handler. */ +1: pushq %rdi + cfi_adjust_cfa_offset(8) - retq + LOCK + addq $1, NWAITERS(%rdi) - cfi_adjust_cfa_offset(16) - cfi_offset(12, -16) - cfi_offset(13, -24) -1: call __pthread_enable_asynccancel +.LcleanupSTART: +6: call __pthread_enable_asynccancel movl %eax, %r8d xorq %r10, %r10 movl $SYS_futex, %eax - movq %r13, %rdi - movq %r10, %rsi - movq %r10, %rdx +#if FUTEX_WAIT == 0 + movl PRIVATE(%rdi), %esi +#else + movl $FUTEX_WAIT, %esi + orl PRIVATE(%rdi), %esi +#endif + xorl %edx, %edx syscall - movq %rax, %r12 + movq %rax, %rcx - movl %r8d, %edi + xchgq %r8, %rdi call __pthread_disable_asynccancel +.LcleanupEND: + movq %r8, %rdi - testq %r12, %r12 - je 3b - cmpq $-EWOULDBLOCK, %r12 - je 3b - negq %r12 + testq %rcx, %rcx + je 3f + cmpq $-EWOULDBLOCK, %rcx + jne 4f + +3: +#if VALUE == 0 + movl (%rdi), %eax +#else + movl VALUE(%rdi), %eax +#endif +5: testl %eax, %eax + je 6b + + leal -1(%rax), %edx + LOCK +#if VALUE == 0 + cmpxchgl %edx, (%rdi) +#else + cmpxchgl %edx, VALUE(%rdi) +#endif + jne 5b + + xorl %eax, %eax + +9: LOCK + subq $1, NWAITERS(%rdi) + + leaq 8(%rsp), %rsp + cfi_adjust_cfa_offset(-8) + + retq + + cfi_adjust_cfa_offset(8) +4: negq %rcx #if USE___THREAD movq errno@gottpoff(%rip), %rdx - movl %r12d, %fs:(%rdx) + movl %ecx, %fs:(%rdx) #else +# error "not supported. %rcx and %rdi must be preserved" callq __errno_location@plt - movl %r12d, (%rax) + movl %ecx, (%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) + jmp 9b + .size sem_wait,.-sem_wait - retq -4: /* Canceled. */ - movq $0xffffffffffffffff, %fs:RESULT + .type sem_wait_cleanup,@function +sem_wait_cleanup: + movq (%rsp), %rdi LOCK - orl $0x10, %fs:CANCELHANDLING - movq %fs:CLEANUP_JMP_BUF, %rdi - jmp HIDDEN_JUMPTARGET (__pthread_unwind) + subq $1, NWAITERS(%rdi) + movq %rax, %rdi +.LcallUR: + call _Unwind_Resume@PLT + hlt +.LENDCODE: cfi_endproc - .size sem_wait,.-sem_wait + .size sem_wait_cleanup,.-sem_wait_cleanup + + + .section .gcc_except_table,"a",@progbits +.LexceptSTART: + .byte DW_EH_PE_omit # @LPStart format + .byte DW_EH_PE_omit # @TType format + .byte DW_EH_PE_uleb128 # call-site format + .uleb128 .Lcstend-.Lcstbegin +.Lcstbegin: + .uleb128 .LcleanupSTART-.LSTARTCODE + .uleb128 .LcleanupEND-.LcleanupSTART + .uleb128 sem_wait_cleanup-.LSTARTCODE + .uleb128 0 + .uleb128 .LcallUR-.LSTARTCODE + .uleb128 .LENDCODE-.LcallUR + .uleb128 0 + .uleb128 0 +.Lcstend: + + +#ifdef SHARED + .hidden DW.ref.__gcc_personality_v0 + .weak DW.ref.__gcc_personality_v0 + .section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits + .align 8 + .type DW.ref.__gcc_personality_v0, @object + .size DW.ref.__gcc_personality_v0, 8 +DW.ref.__gcc_personality_v0: + .quad __gcc_personality_v0 +#endif |