diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/cancellation.S')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/cancellation.S | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/cancellation.S b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/cancellation.S new file mode 100644 index 000000000..680696200 --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/cancellation.S @@ -0,0 +1,116 @@ +/* Copyright (C) 2009 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2009. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> +#include <tcb-offsets.h> +#include <kernel-features.h> +#include "lowlevellock.h" + +#ifdef IS_IN_libpthread +# ifdef SHARED +# define __pthread_unwind __GI___pthread_unwind +# endif +#else +# ifndef SHARED + .weak __pthread_unwind +# endif +#endif + + +#ifdef __ASSUME_PRIVATE_FUTEX +# define LOAD_PRIVATE_FUTEX_WAIT(reg) \ + movl $(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), reg +#else +# if FUTEX_WAIT == 0 +# define LOAD_PRIVATE_FUTEX_WAIT(reg) \ + movl %fs:PRIVATE_FUTEX, reg +# else +# define LOAD_PRIVATE_FUTEX_WAIT(reg) \ + movl %fs:PRIVATE_FUTEX, reg ; \ + orl $FUTEX_WAIT, reg +# endif +#endif + +/* It is crucial that the functions in this file don't modify registers + other than %rax and %r11. The syscall wrapper code depends on this + because it doesn't explicitly save the other registers which hold + relevant values. */ + .text + + .hidden __pthread_enable_asynccancel +ENTRY(__pthread_enable_asynccancel) + movl %fs:CANCELHANDLING, %eax +2: movl %eax, %r11d + orl $TCB_CANCELTYPE_BITMASK, %r11d + cmpl %eax, %r11d + je 1f + + lock + cmpxchgl %r11d, %fs:CANCELHANDLING + jnz 2b + + andl $(TCB_CANCELSTATE_BITMASK|TCB_CANCELTYPE_BITMASK|TCB_CANCELED_BITMASK|TCB_EXITING_BITMASK|TCB_CANCEL_RESTMASK|TCB_TERMINATED_BITMASK), %r11d + cmpl $(TCB_CANCELTYPE_BITMASK|TCB_CANCELED_BITMASK), %r11d + je 3f + +1: ret + +3: movq $TCB_PTHREAD_CANCELED, %fs:RESULT + lock + orl $TCB_EXITING_BITMASK, %fs:CANCELHANDLING + movq %fs:CLEANUP_JMP_BUF, %rdi +#ifdef SHARED + call __pthread_unwind@PLT +#else + call __pthread_unwind +#endif + hlt +END(__pthread_enable_asynccancel) + + + .hidden __pthread_disable_asynccancel +ENTRY(__pthread_disable_asynccancel) + testl $TCB_CANCELTYPE_BITMASK, %edi + jnz 1f + + movl %fs:CANCELHANDLING, %eax +2: movl %eax, %r11d + andl $~TCB_CANCELTYPE_BITMASK, %r11d + lock + cmpxchgl %r11d, %fs:CANCELHANDLING + jnz 2b + + movl %r11d, %eax +3: andl $(TCB_CANCELING_BITMASK|TCB_CANCELED_BITMASK), %eax + cmpl $TCB_CANCELING_BITMASK, %eax + je 4f +1: ret + + /* Performance doesn't matter in this loop. We will + delay until the thread is canceled. And we will unlikely + enter the loop twice. */ +4: movq %fs:0, %rdi + movl $__NR_futex, %eax + xorq %r10, %r10 + addq $CANCELHANDLING, %rdi + LOAD_PRIVATE_FUTEX_WAIT (%esi) + syscall + movl %fs:CANCELHANDLING, %eax + jmp 3b +END(__pthread_disable_asynccancel) |