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baremetal: aarch64 timer example

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Ciro Santilli 六四事件 法轮功
2019-01-22 00:00:00 +00:00
parent f4ded18780
commit 9acbcaaa5b
3 changed files with 81 additions and 6 deletions
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6
baremetal/arch/arm/el.c
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@@ -4,8 +4,8 @@
#include <inttypes.h>
int main(void) {
register uint32_t r0 __asm__ ("r0");
__asm__ ("mrs r0, CPSR" : : : "%r0");
printf("%" PRIu32 "\n", r0 & 0x1F);
uint32_t cpsr;
__asm__ ("mrs %0, CPSR" : "=r" (cpsr) : :);
printf("%" PRIu32 "\n", cpsr & 0x1F);
return 0;
}