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 } 39