tests/tcg/arm/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("r0") = type;
  17     register uintptr_t a0 asm("r1") = arg0;
  18 #ifdef __thumb__
  19 #  define SVC  "svc 0xab"
  20 #else
  21 #  define SVC  "svc 0x123456"
  22 #endif
  23     asm(SVC : "=r" (t)
  24         : "r" (t), "r" (a0));
  25
  26     return t;
  27 }
  28
  29 int main(void)
  30 {
  31     char c;
  32
  33     ml_printf("Semihosting Console Test\n");
  34     ml_printf("hit X to exit:");
  35
  36     do {
  37         c = __semi_call(SYS_READC, 0);
  38         __sys_outc(c);
  39     } while (c != 'X');
  40
  41     return 0;
  42 }