a125dd6dce
- add ELF loader - create heap on demand (on first touch) - add system call to increase the heap
113 lines
3 KiB
C
113 lines
3 KiB
C
/*
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* Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <eduos/stddef.h>
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#include <eduos/stdio.h>
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#include <eduos/tasks.h>
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#include <eduos/errno.h>
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#include <eduos/syscall.h>
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#include <eduos/spinlock.h>
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static int sys_write(int fd, const char* buf, size_t len)
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{
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//TODO: Currently, we ignore the file descriptor
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if (BUILTIN_EXPECT(!buf, 0))
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return -1;
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kputs(buf);
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return 0;
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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 = current_task;
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vma_t* heap = task->heap;
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int ret;
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spinlock_lock(&task->vma_lock);
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if (BUILTIN_EXPECT(!heap,0 )) {
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kprintf("sys_sbrk: missing heap!\n");
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abort();
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}
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ret = heap->end;
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heap->end += incr;
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if (heap->end < heap->start)
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heap->end = heap->start;
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// allocation and mapping of new pages for the heap
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// is catched by the pagefault handler
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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 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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//TODO: Currently, we ignore file descriptors
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case __NR_open:
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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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default:
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kprintf("invalid system call: %u\n", sys_nr);
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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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