freedomtan / aarch64-bare-metal-qemu Goto Github PK

int my_printf(const char *format, ...);

int main(void)
{
  // exception_svc_test();
  my_printf("baburiba");
  timer_test();
}

#include <stdarg.h>

int my_printf(const char *format, ...)
{
  va_list arguments;
  va_start(arguments, format);

  int ret = my_vprintf(format, arguments);

  va_end(arguments);
  return ret;
}

int my_vprintf(const char *format, va_list arguments)
{
  return 42;
}

int _write(char *buf, int num) { return num; }

void *
_sbrk(int incr) { return 0; }

Exception Handler! (AARCH64_EXC_SYNC_SPX)
An exception occur:
exc_type: 0x00000000 00000011
ESR: 0x00000000 1FE00000  SP: 0x00000000 40FFFEC0 ELR: 0x00000000 40001910 SPSR: 0x00000000 600003C5
 x0: 0x00000000 40002960  x1: 0x00000000 40000000  x2: 0x00000000 00000000  x3: 0x00000000 00000000
 x4: 0x00000000 00000000  x5: 0x00000000 00000000  x6: 0x00000000 00000000  x7: 0x00000000 00000000
 x8: 0x00000000 00000000  x9: 0x00000000 00000000 x10: 0x00000000 00000000 x11: 0x00000000 00000000
x12: 0x00000000 00000000 x13: 0x00000000 00000000 x14: 0x00000000 00000000 x15: 0x00000000 00000000
x16: 0x00000000 00000000 x17: 0x00000000 00000000 x18: 0x00000000 00000000 x19: 0x00000000 00000000
x20: 0x00000000 00000000 x21: 0x00000000 00000000 x22: 0x00000000 00000000 x23: 0x00000000 00000000
x24: 0x00000000 00000000 x25: 0x00000000 00000000 x26: 0x00000000 00000000 x27: 0x00000000 00000000
x28: 0x00000000 00000000 x29: 0x00000000 40FFFEC0 x30: 0x00000000 400018D8

00000000400018e8 <my_printf>:
    400018e8:	a9ad7bfd 	stp	x29, x30, [sp, #-304]!
    400018ec:	910003fd 	mov	x29, sp
    400018f0:	f9001fe0 	str	x0, [sp, #56]
    400018f4:	f9007fe1 	str	x1, [sp, #248]
    400018f8:	f90083e2 	str	x2, [sp, #256]
    400018fc:	f90087e3 	str	x3, [sp, #264]
    40001900:	f9008be4 	str	x4, [sp, #272]
    40001904:	f9008fe5 	str	x5, [sp, #280]
    40001908:	f90093e6 	str	x6, [sp, #288]
    4000190c:	f90097e7 	str	x7, [sp, #296]
    40001910:	3d801fe0 	str	q0, [sp, #112] <--- first quad store!
    40001914:	3d8023e1 	str	q1, [sp, #128]
    40001918:	3d8027e2 	str	q2, [sp, #144]
    4000191c:	3d802be3 	str	q3, [sp, #160]
    40001920:	3d802fe4 	str	q4, [sp, #176]
    40001924:	3d8033e5 	str	q5, [sp, #192]
    40001928:	3d8037e6 	str	q6, [sp, #208]
    4000192c:	3d803be7 	str	q7, [sp, #224]
    40001930:	9104c3e0 	add	x0, sp, #0x130
    40001934:	f90027e0 	str	x0, [sp, #72]
    40001938:	9104c3e0 	add	x0, sp, #0x130
    4000193c:	f9002be0 	str	x0, [sp, #80]
    40001940:	9103c3e0 	add	x0, sp, #0xf0
    40001944:	f9002fe0 	str	x0, [sp, #88]
    40001948:	128006e0 	mov	w0, #0xffffffc8            	// #-56
    4000194c:	b90063e0 	str	w0, [sp, #96]
    40001950:	12800fe0 	mov	w0, #0xffffff80            	// #-128
    40001954:	b90067e0 	str	w0, [sp, #100]
    40001958:	910043e0 	add	x0, sp, #0x10
    4000195c:	910123e1 	add	x1, sp, #0x48
    40001960:	ad400420 	ldp	q0, q1, [x1]
    40001964:	ad000400 	stp	q0, q1, [x0]
    40001968:	910043e0 	add	x0, sp, #0x10
    4000196c:	aa0003e1 	mov	x1, x0
    40001970:	f9401fe0 	ldr	x0, [sp, #56]
    40001974:	94000005 	bl	40001988 <my_vprintf>
    40001978:	b9006fe0 	str	w0, [sp, #108]
    4000197c:	b9406fe0 	ldr	w0, [sp, #108]
    40001980:	a8d37bfd 	ldp	x29, x30, [sp], #304
    40001984:	d65f03c0 	ret