116 lines
2.3 KiB
C
116 lines
2.3 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU 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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* GNU 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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int
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_sys_call (int sys_call)
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{
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int r;
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asm (
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"mov %1,%%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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: "rm" (sys_call)
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: "eax"
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);
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if (r < 0)
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{
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errno = -r;
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r = -1;
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}
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else
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errno = 0;
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return r;
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}
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int
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_sys_call1 (int sys_call, int one)
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{
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int r;
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asm (
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"mov %1,%%eax\n\t"
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"mov %2,%%ebx\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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: "rm" (sys_call), "rm" (one)
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: "eax", "ebx"
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);
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if (r < 0)
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{
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errno = -r;
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r = -1;
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}
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else
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errno = 0;
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return r;
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}
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int
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_sys_call2 (int sys_call, int one, int two)
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{
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int r;
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asm (
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"mov %1,%%eax\n\t"
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"mov %2,%%ebx\n\t"
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"mov %3,%%ecx\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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: "rm" (sys_call), "rm" (one), "rm" (two)
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: "eax", "ebx", "ecx"
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);
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if (r < 0)
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{
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errno = -r;
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r = -1;
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}
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else
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errno = 0;
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return r;
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}
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int
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_sys_call3 (int sys_call, int one, int two, int three)
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{
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int r;
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asm (
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"mov %2,%%ebx\n\t"
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"mov %3,%%ecx\n\t"
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"mov %4,%%edx\n\t"
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"mov %1,%%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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: "rm" (sys_call), "rm" (one), "rm" (two), "rm" (three)
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: "eax", "ebx", "ecx", "edx"
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);
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if (r < 0)
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{
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errno = -r;
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r = -1;
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}
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else
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errno = 0;
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return r;
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}
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