mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-23 02:05:57 +01:00
24 lines
627 B
ArmAsm
24 lines
627 B
ArmAsm
/* 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
|