gbasys
view src/syscall.c @ 12:a6ddf338a111
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| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Mon, 01 Feb 2016 04:41:27 +0200 |
| parents | c50064b181c2 |
| children |
line source
1 /*
2 gbasys - a gameboy advance hardware abstraction library
3 Copyright (C) 2004-2014 John Tsiombikas <nuclear@member.fsf.org>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18 #include "config.h"
20 #include <stdio.h>
21 #include <stdarg.h>
22 #include "syscall.h"
24 void halt(void)
25 {
26 __syscall(2);
27 }
29 void stop(void)
30 {
31 __syscall(3);
32 }
34 void print_vba(const char *str, ...)
35 {
36 char buf[128];
37 va_list arg_list;
39 va_start(arg_list, str);
40 vsnprintf(buf, 128, str, arg_list);
41 va_end(arg_list);
43 __asm__ __volatile__(
44 "mov r0, %0\n\t"
45 "swi 0xff0000\n\t" :
46 : "r" (buf)
47 : "r0"
48 );
49 }