99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2010 by Thomas Martitz
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "system.h"
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#include "kernel.h"
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#include "file.h"
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#include "debug.h"
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#include "load_code.h"
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/* load binary blob from disk to memory, returning a handle */
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void * lc_open(const char *filename, unsigned char *buf, size_t buf_size)
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{
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int fd = open(filename, O_RDONLY);
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ssize_t read_size;
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struct lc_header hdr;
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unsigned char *buf_end = buf+buf_size;
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off_t copy_size;
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if (fd < 0)
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{
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DEBUGF("Could not open file");
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goto error;
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}
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#if NUM_CORES > 1
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/* Make sure COP cache is flushed and invalidated before loading */
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{
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int my_core = switch_core(CURRENT_CORE ^ 1);
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switch_core(my_core);
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}
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#endif
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/* read the header to obtain the load address */
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read_size = read(fd, &hdr, sizeof(hdr));
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if (read_size < 0)
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{
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DEBUGF("Could not read from file");
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goto error_fd;
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}
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/* hdr.end_addr points to the end of the bss section,
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* but there might be idata/icode behind that so the bytes to copy
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* can be larger */
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copy_size = MAX(filesize(fd), hdr.end_addr - hdr.load_addr);
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if (hdr.load_addr < buf || (hdr.load_addr+copy_size) > buf_end)
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{
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DEBUGF("Binary doesn't fit into memory");
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goto error_fd;
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}
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/* go back to beginning to load the whole thing (incl. header) */
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if (lseek(fd, 0, SEEK_SET) < 0)
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{
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DEBUGF("lseek failed");
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goto error_fd;
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}
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/* the header has the addresses where the code is linked at */
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read_size = read(fd, hdr.load_addr, copy_size);
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close(fd);
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if (read_size < 0)
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{
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DEBUGF("Could not read from file");
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goto error;
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}
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/* commit dcache and discard icache */
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commit_discard_idcache();
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/* return a pointer the header, reused by lc_get_header() */
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return hdr.load_addr;
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error_fd:
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close(fd);
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error:
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return NULL;
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}
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