88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
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/* -*-comment-start: "//";comment-end:""-*-
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* Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017 Jan Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of Mes.
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*
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* 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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* 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 Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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void
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exit ()
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{
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asm (".byte 0x8b 0x5d 0x08"); // mov 0x8(%ebp),%ebx
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asm (".byte 0xb8 0x01 0x00 0x00 0x00"); // mov $0x1,%eax
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asm (".byte 0xcd 0x80"); // int $0x80
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}
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void
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write ()
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{
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asm (".byte 0x8b 0x5d 0x08"); // mov 0x8(%ebp),%ebx
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asm (".byte 0x8b 0x4d 0x0c"); // mov 0xc(%ebp),%ecx
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asm (".byte 0x8b 0x55 0x10"); // mov 0x10(%ebp),%edx
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asm (".byte 0xb8 0x04 0x00 0x00 0x00"); // mov $0x4,%eax
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asm (".byte 0xcd 0x80"); // int $0x80
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}
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int
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strlen (char const* s)
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{
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int i = 0;
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while (s[i]) i++;
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return i;
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}
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int
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eputs (char const* s)
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{
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int i = strlen (s);
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write (2, s, i);
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return 0;
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}
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char **g_environment;
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char **
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_env (char **e)
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{
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return e;
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}
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int
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_start ()
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{
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asm (".byte 0x89 0xe8"); // mov %ebp,%eax
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asm (".byte 0x83 0xc0 0x08"); // add $0x8,%eax
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asm (".byte 0x50"); // push %eax
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asm (".byte 0x89 0xe8"); // mov %ebp,%eax
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asm (".byte 0x83 0xc0 0x04"); // add $0x4,%eax
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asm (".byte 0x0f 0xb6 0x00"); // movzbl (%eax),%eax
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asm (".byte 0x50"); // push %eax
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asm (".byte 0x89 0xe8"); // mov %ebp,%eax
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asm (".byte 0x83 0xc0 0x04"); // add $0x4,%eax
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asm (".byte 0x0f 0xb6 0x00"); // movzbl (%eax),%eax
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asm (".byte 0x83 0xc0 0x03"); // add $0x3,%eax
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asm (".byte 0xc1 0xe0 0x02"); // shl $0x2,%eax
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asm (".byte 0x01 0xe8"); // add %ebp,%eax
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asm (".byte 0x50"); // push %eax
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g_environment = _env ();
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asm (".byte 0x58");
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int r = main ();
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exit (r);
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}
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