mes/lib/linux-gcc.c
Jan Nieuwenhuizen d1e3a786aa
mescc: Support gcc-3.2: Reset errno.
* lib/linux-gcc.c (_sys_call, _sys_call1, _sys_call2, _sys_call3):
  Reset errno.
* lib/linux-mes.c (__sys_call, __sys_call1, __sys_call2 ,
  __sys_call3): Rename from _*.
   (_sys_call, _sys_call1, _sys_call2, _sys_call3): New function.
  Reset errno.
2018-06-07 07:16:43 +02:00

112 lines
2.3 KiB
C

/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018 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 <errno.h>
int
_sys_call (int sys_call)
{
#if !__TINYC__
int r;
asm (
"mov %1,%%eax\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (sys_call)
: "eax"
);
if (r < 0)
errno = -r;
else
errno = 0
return r;
#endif
}
int
_sys_call1 (int sys_call, int one)
{
#if !__TINYC__
int r;
asm (
"mov %1,%%eax\n\t"
"mov %2,%%ebx\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (sys_call), "" (one)
: "eax", "ebx"
);
if (r < 0)
errno = -r;
else
errno = 0
return r;
#endif
}
int
_sys_call2 (int sys_call, int one, int two)
{
#if !__TINYC__
int r;
asm (
"mov %1,%%eax\n\t"
"mov %2,%%ebx\n\t"
"mov %3,%%ecx\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (sys_call), "" (one), "" (two)
: "eax", "ebx", "ecx"
);
if (r < 0)
errno = -r;
else
errno = 0
return r;
#endif
}
int
_sys_call3 (int sys_call, int one, int two, int three)
{
#if !__TINYC__
int r;
asm (
"mov %2,%%ebx\n\t"
"mov %3,%%ecx\n\t"
"mov %4,%%edx\n\t"
"mov %1,%%eax\n\t"
"int $0x80\n\t"
"mov %%eax,%0\n\t"
: "=r" (r)
: "" (sys_call), "" (one), "" (two), "" (three)
: "eax", "ebx", "ecx", "edx"
);
if (r < 0)
errno = -r;
else
errno = 0
return r;
#endif
}