qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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semiconsole.c (637B)

      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 }