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x86 asm: move rotation and bit instructoins in from x86-assembly-cheat

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Ciro Santilli 六四事件 法轮功
2019-06-16 00:00:03 +00:00
parent 89084d2332
commit 658ac53d0f
10 changed files with 313 additions and 0 deletions
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27
userland/arch/x86_64/rol.S Normal file
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@@ -0,0 +1,27 @@
/* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-shift-and-rotate-instructions */
#include <lkmc.h>
LKMC_PROLOGUE
mov $0x81, %r12
/* axl = 03h, CF = 1 */
rol $1, %r12b
LKMC_ASSERT(jc)
LKMC_ASSERT_EQ(%r12, $3)
/* axl = 04h, CF = 0 */
rol $1, %r12b
LKMC_ASSERT(jnc)
LKMC_ASSERT_EQ(%r12, $6)
/* axl = 03h, CF = 0 */
ror $2, %r12b
LKMC_ASSERT(jc)
LKMC_ASSERT_EQ(%r12, $0x81)
/* axl = 81h, CF = 1 */
ror $1, %r12b
LKMC_ASSERT(jc)
LKMC_ASSERT_EQ(%r12, $0x0C0)
LKMC_EPILOGUE