tests/tcg/aarch64/system/semiconsole.c

   1 /*
   2  * Semihosting Console Test
   3  *
   4  * Copyright (c) 2019 Linaro Ltd
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-or-later
   7  */
   8
   9 #include <stdint.h>
  10 #include <minilib.h>
  11
  12 #define SYS_READC 0x7
  13
  14 uintptr_t __semi_call(uintptr_t type, uintptr_t arg0)
  15 {
  16     register uintptr_t t asm("x0") = type;
  17     register uintptr_t a0 asm("x1") = arg0;
  18     asm("hlt 0xf000"
  19         : "=r" (t)
  20         : "r" (t), "r" (a0));
  21
  22     return t;
  23 }
  24
  25 int main(void)
  26 {
  27     char c;
  28
  29     ml_printf("Semihosting Console Test\n");
  30     ml_printf("hit X to exit:");
  31
  32     do {
  33         c = __semi_call(SYS_READC, 0);
  34         __sys_outc(c);
  35     } while (c != 'X');
  36
  37     return 0;
  38 }