Files
linux-kernel-module-cheat/userland/arch/aarch64/c/earlyclobber.c
Ciro Santilli 六四事件 法轮功 3388d72bb2 asm: more links
2019-05-05 00:00:00 +00:00

18 lines
366 B
C

/* https://github.com/cirosantilli/linux-kernel-module-cheat#inline-assembly-early-clobbers */
#include <assert.h>
#include <inttypes.h>
int main(void) {
uint64_t in = 1;
uint64_t out;
__asm__ (
"add %[out], %[in], 1;"
"add %[out], %[in], 1;"
: [out] "=&r" (out)
: [in] "r" (in)
:
);
assert(out == 2);
}