98 lines
2.5 KiB
C
98 lines
2.5 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/>.
|
|
*/
|
|
|
|
int g_stdin = 0;
|
|
char **g_environment;
|
|
int _env ();
|
|
int exit ();
|
|
int main(int,char*[]);
|
|
|
|
int
|
|
_start ()
|
|
{
|
|
#if 0
|
|
asm (".byte 0x89 0xe8"); // mov %ebp,%eax
|
|
asm (".byte 0x83 0xc0 0x08"); // add $0x8,%eax
|
|
asm (".byte 0x50"); // push %eax
|
|
|
|
asm (".byte 0x89 0xe8"); // mov %ebp,%eax
|
|
asm (".byte 0x83 0xc0 0x04"); // add $0x4,%eax
|
|
asm (".byte 0x0f 0xb6 0x00"); // movzbl (%eax),%eax
|
|
asm (".byte 0x50"); // push %eax
|
|
|
|
asm (".byte 0x89 0xe8"); // mov %ebp,%eax
|
|
asm (".byte 0x83 0xc0 0x04"); // add $0x4,%eax
|
|
asm (".byte 0x0f 0xb6 0x00"); // movzbl (%eax),%eax
|
|
asm (".byte 0x83 0xc0 0x03"); // add $0x3,%eax
|
|
asm (".byte 0xc1 0xe0 0x02"); // shl $0x2,%eax
|
|
asm (".byte 0x01 0xe8"); // add %ebp,%eax
|
|
asm (".byte 0x50"); // push %eax
|
|
|
|
g_environment = _env ();
|
|
asm (".byte 0x58");
|
|
int r = main ();
|
|
exit (r);
|
|
#else
|
|
int r = main ();
|
|
exit (r);
|
|
#endif
|
|
}
|
|
|
|
char **
|
|
_env (char **e)
|
|
{
|
|
return e;
|
|
}
|
|
|
|
void
|
|
exit ()
|
|
{
|
|
asm (".byte 0x8b 0x5d 0x08"); // mov 0x8(%ebp),%ebx
|
|
asm (".byte 0xb8 0x01 0x00 0x00 0x00"); // mov $0x1,%eax
|
|
asm (".byte 0xcd 0x80"); // int $0x80
|
|
}
|
|
|
|
void
|
|
write ()
|
|
{
|
|
asm (".byte 0x8b 0x5d 0x08"); // mov 0x8(%ebp),%ebx
|
|
asm (".byte 0x8b 0x4d 0x0c"); // mov 0xc(%ebp),%ecx
|
|
asm (".byte 0x8b 0x55 0x10"); // mov 0x10(%ebp),%edx
|
|
|
|
asm (".byte 0xb8 0x04 0x00 0x00 0x00"); // mov $0x4,%eax
|
|
asm (".byte 0xcd 0x80"); // int $0x80
|
|
}
|
|
|
|
int
|
|
strlen (char const* s)
|
|
{
|
|
int i = 0;
|
|
while (s[i]) i++;
|
|
return i;
|
|
}
|
|
|
|
int
|
|
eputs (char const* s)
|
|
{
|
|
int i = strlen (s);
|
|
write (2, s, i);
|
|
return 0;
|
|
}
|