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x86 asm: move binary arithmetic instructions from x86-assembly-cheat except cmp

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Ciro Santilli 六四事件 法轮功
2019-06-12 00:00:00 +00:00
parent 90925e7e06
commit 0028ff0ebd
12 changed files with 326 additions and 8 deletions
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23
userland/arch/x86_64/sbb.S Normal file
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@@ -0,0 +1,23 @@
/* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-binary-arithmetic-instructions
*
* Subtract with Borrow. Like ADC is for ADD, but for subtraction.
*/
#include <lkmc.h>
LKMC_PROLOGUE
/* rax : rbx -= rcx : rdx
* 1 : 0 -= 0 : 0x8000000000000000
* 0 : 0x8000000000000000
*/
mov $0x1, %rax
mov $0x0, %rbx
mov $0x0, %rcx
mov $0x8000000000000000, %rdx
sub %rdx, %rbx
sbb %rcx, %rax
mov %rax, %r12
mov %rbx, %r13
LKMC_ASSERT_EQ(%r12, $0x0)
LKMC_ASSERT_EQ(%r13, $0x8000000000000000)
LKMC_EPILOGUE