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