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/*
* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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 any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/**
* @file
*
* Executable image segments
*
*/
#include <string.h>
#include <errno.h>
#include <ipxe/uaccess.h>
#include <ipxe/memmap.h>
#include <ipxe/errortab.h>
#include <ipxe/segment.h>
/**
* Segment-specific error messages
*
* This error happens sufficiently often to merit a user-friendly
* description.
*/
#define ERANGE_SEGMENT __einfo_error ( EINFO_ERANGE_SEGMENT )
#define EINFO_ERANGE_SEGMENT \
__einfo_uniqify ( EINFO_ERANGE, 0x01, "Requested memory not available" )
struct errortab segment_errors[] __errortab = {
__einfo_errortab ( EINFO_ERANGE_SEGMENT ),
};
/**
* Prepare segment for loading
*
* @v segment Segment start
* @v filesz Size of the "allocated bytes" portion of the segment
* @v memsz Size of the segment
* @ret rc Return status code
*/
int prep_segment ( void *segment, size_t filesz, size_t memsz ) {
struct memmap_region region;
physaddr_t start = virt_to_phys ( segment );
physaddr_t mid = ( start + filesz );
physaddr_t end = ( start + memsz );
physaddr_t max;
DBGC ( segment, "SEGMENT [%#08lx,%#08lx,%#08lx)\n", start, mid, end );
/* Check for malformed lengths */
if ( filesz > memsz ) {
DBGC ( segment, "SEGMENT [%#08lx,%#08lx,%#08lx) is "
"malformed\n", start, mid, end );
return -EINVAL;
}
/* Zero-length segments do not need a memory region */
if ( memsz == 0 )
return 0;
max = ( end - 1 );
/* Check for address space overflow */
if ( max < start ) {
DBGC ( segment, "SEGMENT [%#08lx,%#08lx,%#08lx) wraps "
"around\n", start, mid, end );
return -EINVAL;
}
/* Describe region containing this segment */
memmap_describe ( start, 1, ®ion );
DBGC_MEMMAP ( segment, ®ion );
/* Fail unless region is usable and sufficiently large */
if ( ( ! memmap_is_usable ( ®ion ) ) || ( region.max < max ) ) {
DBGC ( segment, "SEGMENT [%#08lx,%#08lx,%#08lx) does not fit "
"into available memory\n", start, mid, end );
return -ERANGE_SEGMENT;
}
/* Found valid region: zero bss and return */
memset ( ( segment + filesz ), 0, ( memsz - filesz ) );
return 0;
}
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