146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/*
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* Copyright 2010 Stefan Lankes, Chair for Operating Systems,
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* RWTH Aachen University
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of MetalSVM.
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*/
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#include <metalsvm/stdarg.h>
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#include <metalsvm/stdio.h>
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#include <metalsvm/syscall.h>
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#include <metalsvm/tasks.h>
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#include <metalsvm/string.h>
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#include <metalsvm/errno.h>
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static int sys_read(int fd, const char *buf, size_t len)
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{
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unsigned int readbytes;
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readbytes = read_fs(
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per_core(current_task)->fildes_table[fd].node,
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(uint8_t*)buf, len,
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per_core(current_task)->fildes_table[fd].offset);
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per_core(current_task)->fildes_table[fd].offset += readbytes;
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/*kprintf("fd:%i, Dateilaenge:%i, Dateiinhalt: %s \n", fd, len, buf);*/
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/* Beware: still reading above file limit! */
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return readbytes;
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}
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static int sys_write(int fd, const char *buf, size_t len)
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{
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unsigned int wrotebytes;
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/* per_core(current_task)->fildes_table[fd].node->write = 1; */
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wrotebytes = write_fs(
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per_core(current_task)->fildes_table[fd].node,
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(uint8_t*)buf, len, 0);
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/* per_core(current_task)->fildes_table[fd].offset); */
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/* kprintf("ins Dateis. geschr. -- fd:%i, Dateilaenge:%i, Dateiinhalt: %s \n", fd, len, buf); */
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per_core(current_task)->fildes_table[fd].offset += wrotebytes;
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return wrotebytes;
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}
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static int sys_open(const char* file, int flags, int mode)
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{
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int fd;
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for (fd = 0; fd < MAX_FILDES; fd++) {
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if (per_core(current_task)->fildes_table[fd].node == NULL) {
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per_core(current_task)->fildes_table[fd].node = findnode_fs((char*) file);
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return fd;
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}
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}
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if (fd >= MAX_FILDES) {
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kprintf("Unable to create filedescriptor");
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return -EINVAL;
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}
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}
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static int sys_close(int fd)
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{
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close_fs(per_core(current_task)->fildes_table[fd].node);
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per_core(current_task)->fildes_table[fd].node = NULL;
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per_core(current_task)->fildes_table[fd].offset = 0;
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return 0;
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}
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int syscall_handler(uint32_t sys_nr, ...)
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{
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int ret = -EINVAL;
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va_list vl;
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va_start(vl, sys_nr);
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switch(sys_nr)
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{
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case __NR_exit:
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sys_exit(va_arg(vl, uint32_t));
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ret = 0;
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break;
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case __NR_read: {
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int fd = va_arg(vl, int);
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const char* buf = va_arg(vl, const char*);
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size_t len = va_arg(vl, size_t);
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ret = sys_read(fd, buf, len);
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break;
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}
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case __NR_write: {
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int fd = va_arg(vl, int);
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const char* buf = va_arg(vl, const char*);
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size_t len = va_arg(vl, size_t);
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ret = sys_write(fd, buf, len);
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break;
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}
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case __NR_open: {
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const char* file = va_arg(vl, const char*);
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int flags = va_arg(vl, int);
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int mode = va_arg(vl, int);
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ret = sys_open(file, flags, mode);
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break;
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}
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case __NR_close: {
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int fd = va_arg(vl, int);
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ret = sys_close(fd);
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break;
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}
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case __NR_getpid:
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ret = per_core(current_task)->id;
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break;
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case __NR_fork:
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ret = sys_fork();
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break;
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case __NR_wait: {
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int32_t* status = va_arg(vl, int32_t*);
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ret = wait(status);
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break;
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}
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case __NR_execve: {
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const char* name = va_arg(vl, const char*);
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char** argv = va_arg(vl, char**);
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char** env = va_arg(vl, char**);
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ret = sys_execve(name, argv, env);
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break;
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}
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default:
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kputs("invalid system call\n");
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ret = -ENOSYS;
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break;
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};
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va_end(vl);
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return ret;
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}
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