71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mes/lib-mini.h"
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int main (int argc, char *argv[], char *envp[]);
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void /* must not return */
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_start ()
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{
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/*
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sp+1 argv
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sp -> argc
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environ = &argv[argc + 1]
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*/
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/* stdin = 0 */
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asm ("!0 mov____$i8,%r0");
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asm ("mov____%r0,0x32 &__stdin");
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/* stdout = 1 */
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asm ("!1 mov____$i8,%r0");
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asm ("mov____%r0,0x32 &__stdout");
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/* stderr = 2 */
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asm ("!2 mov____$i8,%r0");
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asm ("mov____%r0,0x32 &__stderr");
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/* Add "environ" to main's arguments */
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asm ("!0 ldr____%r0,(%sp,#$i8)"); /* "argc" */
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asm ("!4 ldr____%r1,(%sp,#$i8)"); /* "argv" */
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asm ("add____%r2,%r0,%r1,lsl#4"); /* "environ": argv + argc */
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asm ("!4 add____%r2,$i8"); /* "environ": argv + argc + 1 */
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asm ("push___%r2");
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asm ("push___%r1");
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asm ("push___%r0");
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main ();
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//asm ("mov____%r0,%r0");
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asm ("SYS_exit mov____$i8,%r7");
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asm ("swi____$0");
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asm ("hlt");
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}
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