166 lines
3.0 KiB
C
166 lines
3.0 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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int g_stdin = 0;
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typedef long size_t;
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#if __GNUC__
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void
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exit (int code)
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{
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asm (
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"movl %0,%%ebx\n\t"
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"movl $1,%%eax\n\t"
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"int $0x80"
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: // no outputs "=" (r)
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: "" (code)
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);
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// not reached
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exit (0);
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}
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int
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read (int fd, void* buf, size_t n)
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{
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int r;
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//syscall (SYS_write, fd, s, n));
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asm (
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"movl %1,%%ebx\n\t"
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"movl %2,%%ecx\n\t"
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"movl %3,%%edx\n\t"
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"movl $0x3,%%eax\n\t"
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"int $0x80\n\t"
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"mov %%eax,%0\n\t"
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: "=r" (r)
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: "" (fd), "" (buf), "" (n)
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: "eax", "ebx", "ecx", "edx"
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);
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return r;
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}
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int
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open (char const *s, int mode)
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{
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int r;
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//syscall (SYS_open, mode));
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asm (
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"mov %1,%%ebx\n\t"
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"mov %2,%%ecx\n\t"
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"mov $0x5,%%eax\n\t"
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"int $0x80\n\t"
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"mov %%eax,%0\n\t"
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: "=r" (r)
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: "" (s), "" (mode)
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: "eax", "ebx", "ecx"
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);
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return r;
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}
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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 r = read (g_stdin, &c, 1);
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if (r < 1) return -1;
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return c;
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}
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void
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write (int fd, char const* s, int n)
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{
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int r;
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//syscall (SYS_write, fd, s, n));
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asm (
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"mov %0,%%ebx\n\t"
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"mov %1,%%ecx\n\t"
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"mov %2,%%edx\n\t"
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"mov $0x4, %%eax\n\t"
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"int $0x80\n\t"
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: // no outputs "=" (r)
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: "" (fd), "" (s), "" (n)
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: "eax", "ebx", "ecx", "edx"
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);
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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 (STDOUT, s, strlen (s));
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//int i = write (STDOUT, s, strlen (s));
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write (1, (char*)&c, 1);
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return 0;
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}
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size_t
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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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puts (char const* s)
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{
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//write (STDOUT, s, strlen (s));
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//int i = write (STDOUT, s, strlen (s));
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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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#endif
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int
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main (int argc, char *argv[])
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{
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g_stdin = open ("mesmes", 0);
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int c = getchar ();
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while (c != -1) {
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putchar (c);
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c = getchar ();
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}
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return c;
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}
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#if __GNUC__
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void
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_start ()
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{
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int r;
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asm (
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"mov %%ebp,%%eax\n\t"
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"addl $8,%%eax\n\t"
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"push %%eax\n\t"
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"mov %%ebp,%%eax\n\t"
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"addl $4,%%eax\n\t"
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"movzbl (%%eax),%%eax\n\t"
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"push %%eax\n\t"
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"call main\n\t"
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"movl %%eax,%0\n\t"
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: "=r" (r)
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: //no inputs "" (&main)
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);
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exit (r);
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}
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#endif
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