diff options
Diffstat (limited to 'libc/arch-x86/bionic/atomics_x86.S')
-rw-r--r-- | libc/arch-x86/bionic/atomics_x86.S | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/libc/arch-x86/bionic/atomics_x86.S b/libc/arch-x86/bionic/atomics_x86.S index 666e1821c..e98a391ee 100644 --- a/libc/arch-x86/bionic/atomics_x86.S +++ b/libc/arch-x86/bionic/atomics_x86.S @@ -73,100 +73,3 @@ __futex_syscall4: popl %esi popl %ebx ret - -/* int __atomic_cmpxchg(int old, int new, volatile int* addr) */ - -.text -.globl __atomic_cmpxchg -.type __atomic_cmpxchg, @function -.align 4 -__atomic_cmpxchg: - mov 4(%esp), %eax /* old */ - mov 8(%esp), %ecx /* new */ - mov 12(%esp), %edx /* addr */ - lock cmpxchg %ecx, (%edx) - jnz 1f - xor %eax, %eax - jmp 2f -1: - movl $1, %eax -2: - ret /* 0 == success, 1 == failure */ - - -/* int __atomic_swap(int new, volatile int* addr) */ - -.text -.globl __atomic_swap -.type __atomic_swap, @function -.align 4 -__atomic_swap: - mov 4(%esp), %ecx /* new */ - mov 8(%esp), %edx /* addr */ - lock xchg %ecx, (%edx) - mov %ecx, %eax - ret - - -/* - * int __atomic_dec(volatile int* addr) - * - * My x86 asm is really rusty.. this is probably suboptimal - */ - -.text -.globl __atomic_dec -.type __atomic_dec, @function -.align 4 -__atomic_dec: - pushl %ebx - pushl %esi - movl 12(%esp), %ebx /* addr */ - -1: - movl (%ebx), %esi /* old = *addr */ - movl %esi, %edx - subl $1, %edx /* new = old - 1 */ - - pushl %ebx - pushl %edx - pushl %esi - call __atomic_cmpxchg - addl $12, %esp - test %eax, %eax - jnz 1b - - movl %esi, %eax /* return old */ - popl %esi - popl %ebx - ret - - -.text -/* int __atomic_inc(volatile int* addr) */ -.globl __atomic_inc -.type __atomic_inc, @function -.align 4 -__atomic_inc: - pushl %ebx - pushl %esi - movl 12(%esp), %ebx /* addr */ - -1: - movl (%ebx), %esi /* old = *addr */ - movl %esi, %edx - addl $1, %edx /* new = old + 1 */ - - pushl %ebx - pushl %edx - pushl %esi - call __atomic_cmpxchg - addl $12, %esp - test %eax, %eax - jnz 1b - - movl %esi, %eax /* return old */ - popl %esi - popl %ebx - ret - |