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