diff options
Diffstat (limited to 'arch/x86/lib/atomic64_386_32.S')
| -rw-r--r-- | arch/x86/lib/atomic64_386_32.S | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/arch/x86/lib/atomic64_386_32.S b/arch/x86/lib/atomic64_386_32.S new file mode 100644 index 00000000..00933d5e --- /dev/null +++ b/arch/x86/lib/atomic64_386_32.S @@ -0,0 +1,194 @@ +/* + * atomic64_t for 386/486 + * + * Copyright © 2010 Luca Barbieri + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/linkage.h> +#include <asm/alternative-asm.h> +#include <asm/dwarf2.h> + +/* if you want SMP support, implement these with real spinlocks */ +.macro LOCK reg + pushfl_cfi + cli +.endm + +.macro UNLOCK reg + popfl_cfi +.endm + +#define BEGIN(op) \ +.macro endp; \ + CFI_ENDPROC; \ +ENDPROC(atomic64_##op##_386); \ +.purgem endp; \ +.endm; \ +ENTRY(atomic64_##op##_386); \ + CFI_STARTPROC; \ + LOCK v; + +#define ENDP endp + +#define RET \ + UNLOCK v; \ + ret + +#define RET_ENDP \ + RET; \ + ENDP + +#define v %ecx +BEGIN(read) + movl (v), %eax + movl 4(v), %edx +RET_ENDP +#undef v + +#define v %esi +BEGIN(set) + movl %ebx, (v) + movl %ecx, 4(v) +RET_ENDP +#undef v + +#define v %esi +BEGIN(xchg) + movl (v), %eax + movl 4(v), %edx + movl %ebx, (v) + movl %ecx, 4(v) +RET_ENDP +#undef v + +#define v %ecx +BEGIN(add) + addl %eax, (v) + adcl %edx, 4(v) +RET_ENDP +#undef v + +#define v %ecx +BEGIN(add_return) + addl (v), %eax + adcl 4(v), %edx + movl %eax, (v) + movl %edx, 4(v) +RET_ENDP +#undef v + +#define v %ecx +BEGIN(sub) + subl %eax, (v) + sbbl %edx, 4(v) +RET_ENDP +#undef v + +#define v %ecx +BEGIN(sub_return) + negl %edx + negl %eax + sbbl $0, %edx + addl (v), %eax + adcl 4(v), %edx + movl %eax, (v) + movl %edx, 4(v) +RET_ENDP +#undef v + +#define v %esi +BEGIN(inc) + addl $1, (v) + adcl $0, 4(v) +RET_ENDP +#undef v + +#define v %esi +BEGIN(inc_return) + movl (v), %eax + movl 4(v), %edx + addl $1, %eax + adcl $0, %edx + movl %eax, (v) + movl %edx, 4(v) +RET_ENDP +#undef v + +#define v %esi +BEGIN(dec) + subl $1, (v) + sbbl $0, 4(v) +RET_ENDP +#undef v + +#define v %esi +BEGIN(dec_return) + movl (v), %eax + movl 4(v), %edx + subl $1, %eax + sbbl $0, %edx + movl %eax, (v) + movl %edx, 4(v) +RET_ENDP +#undef v + +#define v %esi +BEGIN(add_unless) + addl %eax, %ecx + adcl %edx, %edi + addl (v), %eax + adcl 4(v), %edx + cmpl %eax, %ecx + je 3f +1: + movl %eax, (v) + movl %edx, 4(v) + movl $1, %eax +2: + RET +3: + cmpl %edx, %edi + jne 1b + xorl %eax, %eax + jmp 2b +ENDP +#undef v + +#define v %esi +BEGIN(inc_not_zero) + movl (v), %eax + movl 4(v), %edx + testl %eax, %eax + je 3f +1: + addl $1, %eax + adcl $0, %edx + movl %eax, (v) + movl %edx, 4(v) + movl $1, %eax +2: + RET +3: + testl %edx, %edx + jne 1b + jmp 2b +ENDP +#undef v + +#define v %esi +BEGIN(dec_if_positive) + movl (v), %eax + movl 4(v), %edx + subl $1, %eax + sbbl $0, %edx + js 1f + movl %eax, (v) + movl %edx, 4(v) +1: +RET_ENDP +#undef v |