aa97000027
* lib/linux/riscv64-mes-gcc/crt1.c (_start): Replace manual initialization of __stdin, __stdout, __stderr, and environ with __init_io (). * lib/linux/riscv64-mes-mescc/crt1.c (_start): Likewise.
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
|
|
* GNU Mes --- Maxwell Equations of Software
|
|
* Copyright © 2018,2023 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
|
|
* Copyright © 2021 W. J. van der Laan <laanwj@protonmail.com>
|
|
*
|
|
* This file is part of GNU Mes.
|
|
*
|
|
* GNU Mes is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 3 of the License, or (at
|
|
* your option) any later version.
|
|
*
|
|
* GNU Mes is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "mes/lib-mini.h"
|
|
int main (int argc, char *argv[], char *envp[]);
|
|
|
|
/* mesc will generate the following preamble:
|
|
|
|
push ra
|
|
push fp
|
|
*/
|
|
int
|
|
_start ()
|
|
{
|
|
// environ is &argv[argc + 1]
|
|
asm ("mv_____%t1,%fp");
|
|
asm ("addi___%t1,%t1,$i8_8 !0x1"); // 0x10 to skip over pushed fp+ra, 0x8 to skip over argc
|
|
asm ("addi___%t5,%fp,$i8_0 !0x1"); // 0x10 to skip over pushed fp+ra
|
|
asm ("ld_____%t0,0(%t5)");
|
|
asm ("addi___%t0,%t0,1");
|
|
asm ("li_____%t5,$i32 %0x3"); // skip over all arguments and the final NULL
|
|
asm ("sll____%t0,%t0,%t5");
|
|
asm ("add____%t0,%t0,%t1");
|
|
asm ("push___%t0"); // envp
|
|
asm ("push___%t1"); // argv
|
|
asm ("sd_____%t0,0(%t1)");
|
|
asm ("addi___%t5,%fp,$i8_0 !0x1"); // 0x10 to skip over pushed fp+ra
|
|
asm ("ld_____%t0,0(%t5)");
|
|
asm ("push___%t0"); // argc
|
|
|
|
__init_io ();
|
|
main ();
|
|
|
|
asm ("mv_____%a0,%t0");
|
|
asm ("li_____%a7,SYS_exit");
|
|
asm ("ecall");
|
|
asm ("ebreak");
|
|
}
|