mes/mlibc/libc-gcc+tcc.c

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/* -*-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/>.
*/
#define FULL_MALLOC 1
#include <libc-gcc.c>
#include <libc-mes+tcc.c>
int errno;
#include <unistd.h>
#include <stdarg.h>
#include <signal.h>
#include <sys/mman.h>
#include <sys/time.h>
#define SYS_exit "0x01"
#define SYS_read "0x03"
#define SYS_write "0x04"
#define SYS_open "0x05"
#define SYS_close "0x06"
#define SYS_unlink "0x0a"
#define SYS_lseek "0x13"
#define SYS_access "0x21"
#define SYS_brk "0x2d"
#define SYS_fsync "0x76"
#define SYS_getcwd "0xb7"
int
close (int fd)
{
int r;
asm (
"mov %0,%%ebx\n\t"
"mov $"SYS_close",%%eax\n\t"
"int $0x80"
: "=r" (r)
: "" (fd)
);
return r;
}
int
unlink (char const *file_name)
{
int r;
asm (
"mov %0,%%ebx\n\t"
"mov $"SYS_unlink",%%eax\n\t"
"int $0x80"
: "=r" (r)
: "" (file_name)
);
return r;
}
off_t
lseek (int fd, off_t offset, int whence)
{
int r;
asm (
"mov %1,%%ebx\n\t"
"mov %2,%%ecx\n\t"
"mov %3,%%edx\n\t"
"mov $"SYS_lseek",%%eax\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (fd), "" (offset), "" (whence)
: "eax", "ebx", "ecx", "edx"
);
return r;
}
char *
getcwd (char *buf, size_t size)
{
int r;
asm (
"mov %1,%%ebx\n\t"
"mov %2,%%ecx\n\t"
"mov $"SYS_getcwd",%%eax\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (buf), "" (size)
: "eax", "ebx", "ecx"
);
return r;
}
int
__udivdi3 (int a, int b)
{
return a / b;
}
int
__umoddi3 (int a, int b)
{
return a % b;
}