153 lines
3 KiB
C
153 lines
3 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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#define SYS_exit "0x01"
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#define SYS_read "0x03"
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#define SYS_write "0x04"
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#define SYS_open "0x05"
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#define SYS_close "0x06"
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#define SYS_unlink "0x0a"
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#define SYS_lseek "0x13"
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#define SYS_access "0x21"
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#define SYS_brk "0x2d"
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#define SYS_stat "0x6a"
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#define SYS_fstat "0x6c"
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#define SYS_fsync "0x76"
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#define SYS_getcwd "0xb7"
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int
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close (int fd)
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{
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#if !__TINYC__
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int r;
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asm (
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"mov %0,%%ebx\n\t"
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"mov $"SYS_close",%%eax\n\t"
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"int $0x80"
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: "=r" (r)
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: "" (fd)
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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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unlink (char const *file_name)
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{
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#if !__TINYC__
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int r;
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asm (
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"mov %0,%%ebx\n\t"
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"mov $"SYS_unlink",%%eax\n\t"
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"int $0x80"
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: "=r" (r)
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: "" (file_name)
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);
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return r;
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#endif
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}
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off_t
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lseek (int fd, off_t offset, int whence)
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{
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#if !__TINYC__
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int r;
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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 $"SYS_lseek",%%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), "" (offset), "" (whence)
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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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stat (char const *file_name, struct stat *statbuf)
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{
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#if !__TINYC__
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int r;
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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 $"SYS_stat",%%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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: "" (file_name), "" (statbuf)
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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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fstat (int fd, struct stat *statbuf)
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{
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#if !__TINYC__
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int r;
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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 $"SYS_fstat",%%eax\n\t"
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//"mov $"SYS_oldfstat",%%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), "" (statbuf)
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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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char *
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getcwd (char *buf, size_t size)
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{
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#if !__TINYC__
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int r;
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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 $"SYS_getcwd",%%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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: "" (buf), "" (size)
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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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