80 lines
2 KiB
C
80 lines
2 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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* Copyright © 2020 Danny Milosavljevic <dannym@scratchpost.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 UNROLLED ON STACK
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sp -> argc
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environ = &argv[argc + 1]
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HOWEVER, the function entry already allocated space for locals on the stack (after saving lr and fp, which moved sp again). Hence, use fp instead of sp.
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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____$i8,%r0");
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asm ("mov____%r0,0x32 &__stderr");
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/* Add "environ" to main's arguments */
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asm ("!8 ldr____%r0,(%fp,+#$i8)"); /* "argc" */
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asm ("mov____%fp,%r1");
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asm ("!12 add____%r1,$i8"); /* argv */
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asm ("add____%r2,%r1,%r0,lsl#2"); /* "environ": argv + argc */
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asm ("!4 add____%r2,$i8"); /* "environ": argv + argc + 1 */
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asm ("push___%r2"); /* environ */
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asm ("push___%r1"); /* argv */
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asm ("push___%r0"); /* argc */
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/* environ = r2 */
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asm ("mov____%r2,0x32 &environ");
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main ();
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asm ("SYS_exit mov____$i8,%r7");
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asm ("swi____$0");
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do
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{
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asm ("wfi");
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}
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while (1);
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}
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