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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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26
userland/arch/x86_64/setcc.S Normal file
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@@ -0,0 +1,26 @@
/* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-bit-and-byte-instructions */
#include <lkmc.h>
LKMC_PROLOGUE
mov $0xFF, %r12
/* Set Carry flag. */
stc
/* Check for carry flag. */
setc %r12b
/* Carry flag was set, so set the r12b to 1. */
LKMC_ASSERT_EQ(%r12, $1)
/* Clear carry flag. */
clc
setc %r12b
LKMC_ASSERT_EQ(%r12, $0)
#if 0
/* The operand size can only be one byte:
* Error: operand size mismatch for `setc'
*/
setc %eax
#endif
LKMC_EPILOGUE