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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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24
userland/arch/x86_64/test.S Normal file
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@@ -0,0 +1,24 @@
/* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-bit-and-byte-instructions */
#include <lkmc.h>
LKMC_PROLOGUE
/* 0xF0 & 0x00 == 0x00 */
mov $0xF0, %r12
test $0, %r12b
/* The comparison was equal 0. */
LKMC_ASSERT(jz)
/* r12 is unchanged. */
LKMC_ASSERT_EQ(%r12, $0x0F0)
/* 0xF0 & 0x18 == 0x10 != 0x00 */
mov $0xF0, %r12
test $0x18, %r12b
LKMC_ASSERT(jnz)
LKMC_ASSERT_EQ(%r12, $0x0F0)
/* test %rax, %rax vs cmp $0, %rax: test produces a shorter
* encoding to decide if a register equals zero or not.
* http://stackoverflow.com/questions/147173/x86-assembly-testl-eax-against-eax
*/
LKMC_EPILOGUE