996c449a81
* module/mes/libc-i386.mes (i386:_start): Push environment pointer. * module/mes/libc.mes (g_environment): New global. (_env): New function. (_start): Use it to set g_environment. (getenv): New function. * lib/mlibc.c (strncmp): New function. (getenv): Implement. * lib/mstart.c (_start): Set g_environment. * module/mes/libc.mes (strncmp): New function. (libc): Add it. * scaffold/t.c: (array_ref): Test it.
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
|
|
* Mes --- Maxwell Equations of Software
|
|
* Copyright © 2016,2017 Jan Nieuwenhuizen <janneke@gnu.org>
|
|
*
|
|
* This file is part of Mes.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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 Mes. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#if __GNUC__
|
|
void
|
|
_start ()
|
|
{
|
|
// char **;
|
|
asm (
|
|
"mov %%ebp,%%eax\n\t"
|
|
"addl $4,%%eax\n\t"
|
|
"movzbl (%%eax),%%eax\n\t"
|
|
"addl $3,%%eax\n\t"
|
|
"shl $2,%%eax\n\t"
|
|
"add %%ebp,%%eax\n\t"
|
|
"movl %%eax,%0\n\t"
|
|
: "=g_environment" (g_environment)
|
|
: //no inputs ""
|
|
);
|
|
int r;
|
|
asm (
|
|
"mov %%ebp,%%eax\n\t"
|
|
"addl $8,%%eax\n\t"
|
|
"push %%eax\n\t"
|
|
|
|
"mov %%ebp,%%eax\n\t"
|
|
"addl $4,%%eax\n\t"
|
|
"movzbl (%%eax),%%eax\n\t"
|
|
"push %%eax\n\t"
|
|
|
|
"call main\n\t"
|
|
"movl %%eax,%0\n\t"
|
|
: "=r" (r)
|
|
: //no inputs ""
|
|
);
|
|
exit (r);
|
|
}
|
|
#endif
|