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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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14
userland/arch/x86_64/div_overflow.S Normal file
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@@ -0,0 +1,14 @@
/* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-binary-arithmetic-instructions
*
* If the result of div does not fit into the output register rax, then we get SIGFPE.
*/
#include <lkmc.h>
LKMC_PROLOGUE
/* rdx:rax / 2 == 2:0 / 2 == 1:0 */
mov $2, %rdx
mov $0, %rax
mov $2, %rbx
div %rbx
LKMC_EPILOGUE