f1efaa0e93
* include/stdint.h: #undef types before typedef'ing them. * include/sys/types.h: Likewise. * include/string.h (NULL): New define. * include/stdio.h (BUFSIZ): New define.
262 lines
5 KiB
C
262 lines
5 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* 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 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 <libmes.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#define SYS_fork "0x02"
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#define SYS_read "0x03"
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#define SYS_open "0x05"
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#define SYS_waitpid "0x07"
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#define SYS_execve "0x0b"
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#define SYS_chmod "0x0f"
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#define SYS_access "0x21"
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#define SYS_brk "0x2d"
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#define SYS_ioctl "0x36"
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#define SYS_fsync "0x76"
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int
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fork ()
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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 $"SYS_fork",%%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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: //no inputs
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: "eax"
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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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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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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_read",%%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 $"SYS_open",%%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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pid_t
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waitpid (pid_t pid, int *status_ptr, int options)
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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_waitpid",%%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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: "" (pid), "" (status_ptr), "" (options)
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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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execve (char const* file_name, char *const argv[], char *const env[])
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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_execve",%%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), "" (argv), "" (env)
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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, mode_t mode)
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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_chmod",%%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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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_access",%%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 $"SYS_brk",%%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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ioctl (int fd, unsigned long request, ...)
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{
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#if !__TINYC__
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int p;
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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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: "=p" (p)
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: //no inputs ""
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);
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int r;
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//syscall (SYS_ioctl, fd));
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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_ioctl",%%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), "" (request), "" (p)
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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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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 $"SYS_fsync",%%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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