137 lines
2.8 KiB
C
137 lines
2.8 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/errno.h>
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#include <metalsvm/spinlock.h>
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#include <metalsvm/time.h>
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static int sys_write(int fildes, const char *buf, size_t len)
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{
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int i;
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if (BUILTIN_EXPECT(!buf, 0))
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return -1;
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for (i = 0; i<len; i++, buf++) {
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kputchar(*buf);
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}
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return len;
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}
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static int sys_sbrk(int incr)
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{
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task_t* task = per_core(current_task);
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vma_t* tmp = NULL;
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int ret;
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spinlock_lock(&task->vma_lock);
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tmp = task->vma_list;
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while(tmp && !((task->end_heap >= tmp->start) && (task->end_heap <= tmp->end)))
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tmp = tmp->next;
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ret = (int) task->end_heap;
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task->end_heap += incr;
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if (task->end_heap < task->start_heap)
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task->end_heap = task->start_heap;
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// resize virtual memory area
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if (tmp && (tmp->end <= task->end_heap))
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tmp->end = task->end_heap;
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spinlock_unlock(&task->vma_lock);
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return ret;
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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_write: {
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int fildes = 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(fildes, buf, len);
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break;
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}
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case __NR_open:
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ret = 1;
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break;
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case __NR_close:
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ret = 0;
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break;
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case __NR_sbrk: {
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int incr = va_arg(vl, int);
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ret = sys_sbrk(incr);
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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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case __NR_times: {
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struct tms* buffer = va_arg(vl, struct tms*);
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clock_t* clock = va_arg(vl, clock_t*);
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ret = sys_times(buffer, clock);
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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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