421 lines
8.2 KiB
C
421 lines
8.2 KiB
C
/* -*-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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#include <stdarg.h>
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#include <stdlib.h>
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int g_stdin = 0;
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char **g_environment;
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int _env ();
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int exit ();
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int main(int,char*[]);
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int
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_start ()
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{
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asm ("mov____%ebp,%eax"); // mov %ebp,%eax
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asm ("add____$i8,%eax !8"); // add $0x8,%eax
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asm ("push___%eax"); // push %eax
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asm ("mov____%ebp,%eax"); // mov %ebp,%eax
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asm ("add____$i8,%eax !4"); // add $0x4,%eax
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asm ("movzbl_(%eax),%eax"); // movzbl (%eax),%eax
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asm ("push___%eax"); // push %eax
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asm ("mov____%ebp,%eax"); // mov %ebp,%eax
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asm ("add____$i8,%eax !4"); // add $0x4,%eax
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asm ("movzbl_(%eax),%eax"); // movzbl (%eax),%eax
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asm ("add____$i8,%eax !3"); // add $0x3,%eax
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asm ("shl____$i8,%eax !0x02"); // shl $0x2,%eax
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asm ("add____%ebp,%eax"); // add %ebp,%eax
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asm ("push___%eax"); // push %eax
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g_environment = _env ();
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asm ("pop____%eax"); // pop %eax
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int r = main ();
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exit (r);
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}
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char **
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_env (char **e)
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{
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return e;
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}
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void
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exit ()
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{
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asm ("mov____0x8(%ebp),%ebx !8"); // mov 0x8(%ebp),%ebx
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asm ("mov____$i32,%eax SYS_exit"); // mov $0x1,%eax
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asm ("int____$0x80"); // int $0x80
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}
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void
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read ()
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{
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asm ("mov____0x8(%ebp),%ebx !8"); // mov 0x8(%ebp),%ebx
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asm ("mov____0x8(%ebp),%ecx !12"); // mov 0x8(%ebp),%ecx
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asm ("mov____0x8(%ebp),%edx !16"); // mov 0x8(%ebp),%edx
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asm ("mov____$i32,%eax SYS_read"); // mov $0x3,%eax
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asm ("int____$0x80"); // int $0x80
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}
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void
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write ()
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{
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asm ("mov____0x8(%ebp),%ebx !8"); // mov 0x8(%ebp),%ebx
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asm ("mov____0x8(%ebp),%ecx !12"); // mov 0x8(%ebp),%ecx
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asm ("mov____0x8(%ebp),%edx !16"); // mov 0x8(%ebp),%edx
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asm ("mov____$i32,%eax SYS_write"); // mov $0x4,%eax
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asm ("int____$0x80"); // int $0x80
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}
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void
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open ()
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{
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asm ("mov____0x8(%ebp),%ebx !8"); // mov 0x8(%ebp),%ebx
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asm ("mov____0x8(%ebp),%ecx !12"); // mov 0x8(%ebp),%ecx
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asm ("mov____0x8(%ebp),%edx !16"); // mov 0x8(%ebp),%edx
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asm ("mov____$i32,%eax SYS_open"); // mov $0x5,%eax
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asm ("int____$0x80"); // int $0x80
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}
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void
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access ()
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{
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asm ("mov____0x8(%ebp),%ebx !8"); // mov 0x8(%ebp),%ebx
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asm ("mov____0x8(%ebp),%ecx !12"); // mov 0x8(%ebp),%ecx
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asm ("mov____$i32,%eax SYS_access"); // mov $0x21,%eax
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asm ("int____$0x80"); // int $0x80
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}
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void
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brk ()
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{
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asm ("mov____0x8(%ebp),%ebx !8"); // mov 0x8(%ebp),%ebx
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asm ("mov____$i32,%eax SYS_brk"); // mov $0x2d,%eax
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asm ("int____$0x80"); // int $0x80
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}
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void
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fsync ()
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{
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asm ("mov____0x8(%ebp),%ebx !8"); // mov 0x8(%ebp),%ebx
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asm ("mov____$i32,%eax SYS_fsync"); // mov $0x7c,%eax
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asm ("int____$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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int
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fputs (char const* s, int fd)
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{
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int i = strlen (s);
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write (fd, s, i);
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return 0;
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}
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int
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puts (char const* s)
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{
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int i = strlen (s);
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write (1, s, i);
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return 0;
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}
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int
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putchar (int c)
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{
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write (1, (char*)&c, 1);
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return 0;
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}
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int
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fputc (int c, int fd)
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{
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write (fd, (char*)&c, 1);
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return 0;
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}
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void
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assert_fail (char* s)
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{
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eputs ("assert fail: ");
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eputs (s);
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eputs ("\n");
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//*((int*)0) = 0;
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char *fail = s;
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fail = 0;
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*fail = 0;
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}
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int ungetc_char = -1;
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char ungetc_buf[2];
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int
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getchar ()
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{
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char c;
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int i;
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if (ungetc_char == -1)
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{
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int r = read (g_stdin, &c, 1);
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if (r < 1) return -1;
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i = c;
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}
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else
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{
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//FIXME
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//i = ungetc_buf[ungetc_char--];
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i = ungetc_buf[ungetc_char];
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//ungetc_char--;
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ungetc_char = ungetc_char - 1;
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}
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if (i < 0) i += 256;
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return i;
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}
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int
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fgetc (int fd)
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{
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char c;
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int r = read (fd, &c, 1);
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return c == 1 ? c : (-1);
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}
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//#define assert(x) ((x) ? (void)0 : assert_fail (#x))
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int
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ungetc (int c, int fd)
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{
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//FIXME
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//assert (ungetc_char < 2);
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//assert (ungetc_char == -1 || ungetc_char < 2);
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//FIXME
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//ungetc_buf[++ungetc_char] = c;
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ungetc_char++;
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ungetc_buf[ungetc_char] = c;
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return c;
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}
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int
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strcmp (char const* a, char const* b)
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{
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while (*a && *b && *a == *b)
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{
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a++;b++;
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}
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return *a - *b;
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}
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char *
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strcpy (char *dest, char const *src)
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{
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char *p = dest;
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while (*src) *p++ = *src++;
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*p = 0;
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return dest;
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}
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char itoa_buf[10];
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char const*
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itoa (int x)
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{
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//static char itoa_buf[10];
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//char *p = buf+9;
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char *p = itoa_buf;
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p += 9;
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*p-- = 0;
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//int sign = x < 0; // FIXME
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int sign = 0;
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if (x < 0) sign = 1;
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if (sign)
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x = -x;
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do
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{
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*p-- = '0' + (x % 10);
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x = x / 10;
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} while (x);
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if (sign && *(p + 1) != '0')
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*p-- = '-';
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return p+1;
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}
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int
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isdigit (char c)
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{
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//return (c>='0') && (c<='9');
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if (c>='0' && c<='9') return 1;
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return 0;
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}
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int
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atoi (char const *s)
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{
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int i = 0;
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int sign = 1;
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if (*s && *s == '-')
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{
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sign = -1;
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s++;
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}
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while (isdigit (*s))
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{
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i *= 10;
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i += (*s - '0');
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s++;
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}
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return i * sign;
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}
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char *g_brk = 0;
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void *
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malloc (size_t size)
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{
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if (!g_brk)
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g_brk = brk (0);
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if (brk (g_brk + size) == -1)
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return 0;
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char *p = g_brk;
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g_brk += size;
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return p;
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}
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#if !FULL_MALLOC
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void *
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realloc (void *p, size_t size)
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{
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brk (g_brk + size);
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return g_brk;
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}
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#endif
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int
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strncmp (char const* a, char const* b, int length)
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{
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while (*a && *b && *a == *b && --length) {a++;b++;}
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return *a - *b;
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}
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char *
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getenv (char const* s)
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{
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char **p = g_environment;
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int length = strlen (s);
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while (*p)
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{
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if (!strncmp (s, *p, length) && *(*p + length) == '=') return (*p + length + 1);
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p++;
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}
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return 0;
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}
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int
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vprintf (char const* format, va_list ap)
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{
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char const *p = format;
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while (*p)
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if (*p != '%')
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putchar (*p++);
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else
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{
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p++;
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char c = *p;
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switch (c)
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{
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case '%': {putchar (*p); break;}
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case 'c': {char c; c = va_arg (ap, char); putchar (c); break;}
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case 'd': {int d; d = va_arg (ap, int); puts (itoa (d)); break;}
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case 's': {char *s; s = va_arg (ap, char *); puts (s); break;}
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default: {putchar (*p); break;}
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}
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p++;
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}
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va_end (ap);
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return 0;
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}
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int
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printf (char const* format, ...)
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{
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va_list ap;
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va_start (ap, format);
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int r = vprintf (format, ap);
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va_end (ap);
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return r;
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}
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int
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sprintf (char *str, char const* format, ...)
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{
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va_list ap;
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va_start (ap, format);
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char const *p = format;
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while (*p)
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if (*p != '%')
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*str++ = *p++;
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else
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{
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p++;
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char c = *p;
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switch (c)
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{
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case '%': {*str++ = *p; break;}
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case 'c': {char c; c = va_arg (ap, char); *str++ = c; break;}
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case 'd': {int d; d = va_arg (ap, int); char const *s; s = itoa (d); while (*s) *str++ = *s++; break;}
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case 's': {char *s; s = va_arg (ap, char *); while (*s) *str++ = *s++; break;}
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default: {*str++ = *p; break;}
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}
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p++;
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}
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va_end (ap);
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return 0;
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}
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