main.cpp

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#include <cstdarg>
#include <cstdint>
 
extern "C" {
volatile uint8_t* uart = (uint8_t*)0x9000000;
void putc(char character) { *uart = character; }
 
void SetupFpu() {
  __asm__ volatile(
      "mov X0, #0x00300000\n"
      "msr CPACR_EL1, x0\n"
      "isb\n"
      :
      :
      :);
}
 
struct param {
  uint64_t a;
  uint64_t b;
  uint64_t c;
  uint64_t d;
  uint64_t e;
};
 
void callee([[maybe_unused]] param var) { putc('e'); }
 
void main() {
  SetupFpu();
  putc('0');
  callee({});
  putc('1');
}
}