From 30246557a06bb20618bed906a06d1e1e0faa8bb4 Mon Sep 17 00:00:00 2001 From: Luca Barbieri Date: Fri, 6 Aug 2010 04:04:38 +0200 Subject: x86, asm: Refactor atomic64_386_32.S to support old binutils and be cleaner The old code didn't work on binutils 2.12 because setting a symbol to a register apparently requires a fairly recent version. This commit refactors the code to use the C preprocessor instead, and in the process makes the whole code a bit easier to understand. The object code produced is unchanged as expected. This fixes kernel bugzilla 16506. Reported-by: Dieter Stussy Signed-off-by: Luca Barbieri Signed-off-by: H. Peter Anvin Cc: 2.6.35 LKML-Reference: --- arch/x86/lib/atomic64_386_32.S | 236 ++++++++++++++++++++++------------------- 1 file changed, 128 insertions(+), 108 deletions(-) (limited to 'arch/x86/lib') diff --git a/arch/x86/lib/atomic64_386_32.S b/arch/x86/lib/atomic64_386_32.S index 4a5979aa6883..78ee8e0fa278 100644 --- a/arch/x86/lib/atomic64_386_32.S +++ b/arch/x86/lib/atomic64_386_32.S @@ -25,150 +25,170 @@ CFI_ADJUST_CFA_OFFSET -4 .endm -.macro BEGIN func reg -$v = \reg - -ENTRY(atomic64_\func\()_386) - CFI_STARTPROC - LOCK $v - -.macro RETURN - UNLOCK $v +#define BEGIN(op) \ +.macro END; \ + CFI_ENDPROC; \ +ENDPROC(atomic64_##op##_386); \ +.purgem END; \ +.endm; \ +ENTRY(atomic64_##op##_386); \ + CFI_STARTPROC; \ + LOCK v; + +#define RET \ + UNLOCK v; \ ret -.endm - -.macro END_ - CFI_ENDPROC -ENDPROC(atomic64_\func\()_386) -.purgem RETURN -.purgem END_ -.purgem END -.endm - -.macro END -RETURN -END_ -.endm -.endm - -BEGIN read %ecx - movl ($v), %eax - movl 4($v), %edx -END - -BEGIN set %esi - movl %ebx, ($v) - movl %ecx, 4($v) -END - -BEGIN xchg %esi - movl ($v), %eax - movl 4($v), %edx - movl %ebx, ($v) - movl %ecx, 4($v) -END - -BEGIN add %ecx - addl %eax, ($v) - adcl %edx, 4($v) -END -BEGIN add_return %ecx - addl ($v), %eax - adcl 4($v), %edx - movl %eax, ($v) - movl %edx, 4($v) -END - -BEGIN sub %ecx - subl %eax, ($v) - sbbl %edx, 4($v) -END - -BEGIN sub_return %ecx +#define RET_END \ + RET; \ + END + +#define v %ecx +BEGIN(read) + movl (v), %eax + movl 4(v), %edx +RET_END +#undef v + +#define v %esi +BEGIN(set) + movl %ebx, (v) + movl %ecx, 4(v) +RET_END +#undef v + +#define v %esi +BEGIN(xchg) + movl (v), %eax + movl 4(v), %edx + movl %ebx, (v) + movl %ecx, 4(v) +RET_END +#undef v + +#define v %ecx +BEGIN(add) + addl %eax, (v) + adcl %edx, 4(v) +RET_END +#undef v + +#define v %ecx +BEGIN(add_return) + addl (v), %eax + adcl 4(v), %edx + movl %eax, (v) + movl %edx, 4(v) +RET_END +#undef v + +#define v %ecx +BEGIN(sub) + subl %eax, (v) + sbbl %edx, 4(v) +RET_END +#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) -END - -BEGIN inc %esi - addl $1, ($v) - adcl $0, 4($v) -END - -BEGIN inc_return %esi - movl ($v), %eax - movl 4($v), %edx + addl (v), %eax + adcl 4(v), %edx + movl %eax, (v) + movl %edx, 4(v) +RET_END +#undef v + +#define v %esi +BEGIN(inc) + addl $1, (v) + adcl $0, 4(v) +RET_END +#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) -END - -BEGIN dec %esi - subl $1, ($v) - sbbl $0, 4($v) -END - -BEGIN dec_return %esi - movl ($v), %eax - movl 4($v), %edx + movl %eax, (v) + movl %edx, 4(v) +RET_END +#undef v + +#define v %esi +BEGIN(dec) + subl $1, (v) + sbbl $0, 4(v) +RET_END +#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($v) -END + movl %eax, (v) + movl %edx, 4(v) +RET_END +#undef v -BEGIN add_unless %ecx +#define v %ecx +BEGIN(add_unless) addl %eax, %esi adcl %edx, %edi - addl ($v), %eax - adcl 4($v), %edx + addl (v), %eax + adcl 4(v), %edx cmpl %eax, %esi je 3f 1: - movl %eax, ($v) - movl %edx, 4($v) + movl %eax, (v) + movl %edx, 4(v) movl $1, %eax 2: -RETURN + RET 3: cmpl %edx, %edi jne 1b xorl %eax, %eax jmp 2b -END_ +END +#undef v -BEGIN inc_not_zero %esi - movl ($v), %eax - movl 4($v), %edx +#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 %eax, (v) + movl %edx, 4(v) movl $1, %eax 2: -RETURN + RET 3: testl %edx, %edx jne 1b jmp 2b -END_ +END +#undef v -BEGIN dec_if_positive %esi - movl ($v), %eax - movl 4($v), %edx +#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) + movl %eax, (v) + movl %edx, 4(v) 1: -END +RET_END +#undef v -- cgit v1.2.3