4479540aed
* mlibc/libc-mes.c (_start): Move to top. * mlibc/mini-libc-mes.c (_start): Likewise. * module/mes/elf-util.mes (function-prefix): Update for _start == 0. (function-offset): Likewise.
391 lines
8 KiB
C
391 lines
8 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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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 (".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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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 (".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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read ()
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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 0x03 0x00 0x00 0x00"); // mov $0x3,%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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void
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open ()
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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 0x05 0x00 0x00 0x00"); // mov $0x5,%eax
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asm (".byte 0xcd 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 (".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 0xb8 0x21 0x00 0x00 0x00"); // mov $0x21,%eax
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asm (".byte 0xcd 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 (".byte 0x8b 0x5d 0x08"); // mov 0x8(%ebp),%ebx
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asm (".byte 0xb8 0x2d 0x00 0x00 0x00"); // mov $0x2d,%eax
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asm (".byte 0xcd 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 (".byte 0x8b 0x5d 0x08"); // mov 0x8(%ebp),%ebx
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asm (".byte 0xb8 0x76 0x00 0x00 0x00"); // mov $0x76,%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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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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//#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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//void *g_malloc_base = 0;
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char *g_malloc_base = 0;
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//void *
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int *
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malloc (int size)
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{
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//void *p = brk (0);
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char *p = 0;
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p = brk (0);
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if (!g_malloc_base) g_malloc_base = p;
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brk (p+size);
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return p;
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}
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//void *
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int *
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//realloc (void *p, int size)
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realloc (int *p, int size)
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{
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brk (g_malloc_base + size);
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return g_malloc_base;
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}
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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 **g_environment;
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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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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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#if 0
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// !__MESC__
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// FIXME: mes+nyacc parser bug here
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// works fine with Guile, but let's keep a single input source
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#define pop_va_arg \
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asm (".byte 0x8b 0x45 0xfc"); /* mov -<0x4>(%ebp),%eax :va_arg */ \
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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 0x83 0xc0 0x0c"); /* add $0xc,%eax */ \
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asm (".byte 0x8b 0x00"); /* mov (%eax),%eax */ \
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asm (".byte 0x89 0x45 0xf8"); /* mov %eax,-0x8(%ebp) :va */ \
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asm (".byte 0x50") /* push %eax */
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#else // __MESC__
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#define pop_va_arg asm (".byte 0x8b 0x45 0xfc 0xc1 0xe0 0x02 0x01 0xe8 0x83 0xc0 0x0c 0x8b 0x00 0x89 0x45 0xf8 0x50")
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#endif
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int
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printf (char const* format, int va_args)
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{
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int va_arg = 0;
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int va;
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char *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': {pop_va_arg; putchar ((char)va); va_arg++; break;}
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case 'd': {pop_va_arg; puts (itoa (va)); va_arg++; break;}
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case 's': {pop_va_arg; puts ((char*)va); va_arg++; break;}
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default: putchar (*p);
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}
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p++;
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}
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return 0;
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}
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