mes/lib/linux-gcc.c

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/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2016,2017 Jan (janneke) 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/>.
*/
#include <stdio.h>
#include <mlibc.h>
#include <stdlib.h>
#if !POSIX
int
read (int fd, void* buf, size_t n)
{
#if !__TINYC__
int r;
//syscall (SYS_write, fd, s, n));
asm (
"mov %1,%%ebx\n\t"
"mov %2,%%ecx\n\t"
"mov %3,%%edx\n\t"
"movl $0x3,%%eax\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (fd), "" (buf), "" (n)
: "eax", "ebx", "ecx", "edx"
);
return r;
#endif
}
int
open (char const *s, int flags, ...)
{
#if !__TINYC__
int mode;
asm (
"mov %%ebp,%%eax\n\t"
"add $0x10,%%eax\n\t"
"mov (%%eax),%%eax\n\t"
"mov %%eax,%0\n\t"
: "=mode" (mode)
: //no inputs ""
);
int r;
//syscall (SYS_open, mode));
asm (
"mov %1,%%ebx\n\t"
"mov %2,%%ecx\n\t"
"mov %3,%%edx\n\t"
"mov $0x5,%%eax\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (s), "" (flags), "" (mode)
: "eax", "ebx", "ecx", "edx"
);
return r;
#endif
}
int
chmod (char const *s, int mode)
{
#if !__TINYC__
int r;
//syscall (SYS_chmod, mode));
asm (
"mov %1,%%ebx\n\t"
"mov %2,%%ecx\n\t"
"mov $0x0f,%%eax\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (s), "" (mode)
: "eax", "ebx", "ecx"
);
return r;
#endif
}
int
access (char const *s, int mode)
{
#if !__TINYC__
int r;
//syscall (SYS_access, mode));
asm (
"mov %1,%%ebx\n\t"
"mov %2,%%ecx\n\t"
"mov $0x21,%%eax\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (s), "" (mode)
: "eax", "ebx", "ecx"
);
return r;
#endif
}
void *
brk (void *p)
{
#if !__TINYC__
void *r;
asm (
"mov %1,%%ebx\n\t"
"mov $0x2d,%%eax\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (p)
: "eax", "ebx"
);
return r;
#endif
}
int
fsync (int fd)
{
#if !__TINYC__
int r;
//syscall (SYS_fsync, fd));
asm (
"mov %1,%%ebx\n\t"
"mov $0x76, %%eax\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (fd)
: "eax", "ebx"
);
return r;
#endif
}
#endif //!POSIX