u-boot/libfdt/fdt_rw.c
Gerald Van Baren ad3006fe7e LIBFDT: use memmove() instead of memcpy()
This is partial patch from the DTC/libfdt
commit  67b6b33b9b413a450a72135b5dc59c0a1e33e647
Author: David Gibson <david@gibson.dropbear.id.au>
Date:   Wed Nov 21 11:56:14 2007 +1100

    The patch also fixes one genuine bug caught by valgrind -
    _packblocks() in fdt_rw.c was using memcpy() where it should have been
    using memmove().

Signed-off-by: Gerald Van Baren <vanbaren@cideas.com>
2008-01-08 15:03:47 -05:00

448 lines
12 KiB
C

/*
* libfdt - Flat Device Tree manipulation
* Copyright (C) 2006 David Gibson, IBM Corporation.
*
* libfdt is dual licensed: you can use it either under the terms of
* the GPL, or the BSD license, at your option.
*
* a) This library 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 library 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 library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
*
* Alternatively,
*
* b) Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "libfdt_env.h"
#include <fdt.h>
#include <libfdt.h>
#include "libfdt_internal.h"
static int _blocks_misordered(const void *fdt,
int mem_rsv_size, int struct_size)
{
return (fdt_off_mem_rsvmap(fdt) < ALIGN(sizeof(struct fdt_header), 8))
|| (fdt_off_dt_struct(fdt) <
(fdt_off_mem_rsvmap(fdt) + mem_rsv_size))
|| (fdt_off_dt_strings(fdt) <
(fdt_off_dt_struct(fdt) + struct_size))
|| (fdt_totalsize(fdt) <
(fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)));
}
static int rw_check_header(void *fdt)
{
int err;
if ((err = fdt_check_header(fdt)))
return err;
if (fdt_version(fdt) < 17)
return -FDT_ERR_BADVERSION;
if (_blocks_misordered(fdt, sizeof(struct fdt_reserve_entry),
fdt_size_dt_struct(fdt)))
return -FDT_ERR_BADLAYOUT;
if (fdt_version(fdt) > 17)
fdt_set_version(fdt, 17);
return 0;
}
#define RW_CHECK_HEADER(fdt) \
{ \
int err; \
if ((err = rw_check_header(fdt)) != 0) \
return err; \
}
static inline int _blob_data_size(void *fdt)
{
return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
}
static int _blob_splice(void *fdt, void *p, int oldlen, int newlen)
{
void *end = fdt + _blob_data_size(fdt);
if (((p + oldlen) < p) || ((p + oldlen) > end))
return -FDT_ERR_BADOFFSET;
if ((end - oldlen + newlen) > (fdt + fdt_totalsize(fdt)))
return -FDT_ERR_NOSPACE;
memmove(p + newlen, p + oldlen, end - p - oldlen);
return 0;
}
static int _blob_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p,
int oldn, int newn)
{
int delta = (newn - oldn) * sizeof(*p);
int err;
err = _blob_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
if (err)
return err;
fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
return 0;
}
static int _blob_splice_struct(void *fdt, void *p,
int oldlen, int newlen)
{
int delta = newlen - oldlen;
int err;
if ((err = _blob_splice(fdt, p, oldlen, newlen)))
return err;
fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
return 0;
}
static int _blob_splice_string(void *fdt, int newlen)
{
void *p = fdt + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
int err;
if ((err = _blob_splice(fdt, p, 0, newlen)))
return err;
fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
return 0;
}
static int _find_add_string(void *fdt, const char *s)
{
char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
const char *p;
char *new;
int len = strlen(s) + 1;
int err;
p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s);
if (p)
/* found it */
return (p - strtab);
new = strtab + fdt_size_dt_strings(fdt);
err = _blob_splice_string(fdt, len);
if (err)
return err;
memcpy(new, s, len);
return (new - strtab);
}
int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
{
struct fdt_reserve_entry *re;
int err;
if ((err = rw_check_header(fdt)))
return err;
re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt));
err = _blob_splice_mem_rsv(fdt, re, 0, 1);
if (err)
return err;
re->address = cpu_to_fdt64(address);
re->size = cpu_to_fdt64(size);
return 0;
}
int fdt_del_mem_rsv(void *fdt, int n)
{
struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n);
int err;
if ((err = rw_check_header(fdt)))
return err;
if (n >= fdt_num_mem_rsv(fdt))
return -FDT_ERR_NOTFOUND;
err = _blob_splice_mem_rsv(fdt, re, 1, 0);
if (err)
return err;
return 0;
}
static int _resize_property(void *fdt, int nodeoffset, const char *name, int len,
struct fdt_property **prop)
{
int oldlen;
int err;
*prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
if (! (*prop))
return oldlen;
if ((err = _blob_splice_struct(fdt, (*prop)->data,
ALIGN(oldlen, FDT_TAGSIZE),
ALIGN(len, FDT_TAGSIZE))))
return err;
(*prop)->len = cpu_to_fdt32(len);
return 0;
}
static int _add_property(void *fdt, int nodeoffset, const char *name, int len,
struct fdt_property **prop)
{
uint32_t tag;
int proplen;
int nextoffset;
int namestroff;
int err;
tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
if (tag != FDT_BEGIN_NODE)
return -FDT_ERR_BADOFFSET;
namestroff = _find_add_string(fdt, name);
if (namestroff < 0)
return namestroff;
*prop = _fdt_offset_ptr_w(fdt, nextoffset);
proplen = sizeof(**prop) + ALIGN(len, FDT_TAGSIZE);
err = _blob_splice_struct(fdt, *prop, 0, proplen);
if (err)
return err;
(*prop)->tag = cpu_to_fdt32(FDT_PROP);
(*prop)->nameoff = cpu_to_fdt32(namestroff);
(*prop)->len = cpu_to_fdt32(len);
return 0;
}
int fdt_setprop(void *fdt, int nodeoffset, const char *name,
const void *val, int len)
{
struct fdt_property *prop;
int err;
if ((err = rw_check_header(fdt)))
return err;
err = _resize_property(fdt, nodeoffset, name, len, &prop);
if (err == -FDT_ERR_NOTFOUND)
err = _add_property(fdt, nodeoffset, name, len, &prop);
if (err)
return err;
memcpy(prop->data, val, len);
return 0;
}
int fdt_delprop(void *fdt, int nodeoffset, const char *name)
{
struct fdt_property *prop;
int len, proplen;
RW_CHECK_HEADER(fdt);
prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
if (! prop)
return len;
proplen = sizeof(*prop) + ALIGN(len, FDT_TAGSIZE);
return _blob_splice_struct(fdt, prop, proplen, 0);
}
int fdt_add_subnode_namelen(void *fdt, int parentoffset,
const char *name, int namelen)
{
struct fdt_node_header *nh;
int offset, nextoffset;
int nodelen;
int err;
uint32_t tag;
uint32_t *endtag;
RW_CHECK_HEADER(fdt);
offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
if (offset >= 0)
return -FDT_ERR_EXISTS;
else if (offset != -FDT_ERR_NOTFOUND)
return offset;
/* Try to place the new node after the parent's properties */
fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */
do {
offset = nextoffset;
tag = fdt_next_tag(fdt, offset, &nextoffset);
} while (tag == FDT_PROP);
nh = _fdt_offset_ptr_w(fdt, offset);
nodelen = sizeof(*nh) + ALIGN(namelen+1, FDT_TAGSIZE) + FDT_TAGSIZE;
err = _blob_splice_struct(fdt, nh, 0, nodelen);
if (err)
return err;
nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
memset(nh->name, 0, ALIGN(namelen+1, FDT_TAGSIZE));
memcpy(nh->name, name, namelen);
endtag = (uint32_t *)((void *)nh + nodelen - FDT_TAGSIZE);
*endtag = cpu_to_fdt32(FDT_END_NODE);
return offset;
}
int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
{
return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
}
int fdt_del_node(void *fdt, int nodeoffset)
{
int endoffset;
RW_CHECK_HEADER(fdt);
endoffset = _fdt_node_end_offset(fdt, nodeoffset);
if (endoffset < 0)
return endoffset;
return _blob_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset),
endoffset - nodeoffset, 0);
}
static void _packblocks(const void *fdt, void *buf,
int mem_rsv_size, int struct_size)
{
int mem_rsv_off, struct_off, strings_off;
mem_rsv_off = ALIGN(sizeof(struct fdt_header), 8);
struct_off = mem_rsv_off + mem_rsv_size;
strings_off = struct_off + struct_size;
memmove(buf + mem_rsv_off, fdt + fdt_off_mem_rsvmap(fdt), mem_rsv_size);
fdt_set_off_mem_rsvmap(buf, mem_rsv_off);
memmove(buf + struct_off, fdt + fdt_off_dt_struct(fdt), struct_size);
fdt_set_off_dt_struct(buf, struct_off);
fdt_set_size_dt_struct(buf, struct_size);
memmove(buf + strings_off, fdt + fdt_off_dt_strings(fdt),
fdt_size_dt_strings(fdt));
fdt_set_off_dt_strings(buf, strings_off);
fdt_set_size_dt_strings(buf, fdt_size_dt_strings(fdt));
}
int fdt_open_into(const void *fdt, void *buf, int bufsize)
{
int err;
int mem_rsv_size, struct_size;
int newsize;
void *tmp;
err = fdt_check_header(fdt);
if (err)
return err;
mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
* sizeof(struct fdt_reserve_entry);
if (fdt_version(fdt) >= 17) {
struct_size = fdt_size_dt_struct(fdt);
} else {
struct_size = 0;
while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
;
}
if (!_blocks_misordered(fdt, mem_rsv_size, struct_size)) {
/* no further work necessary */
err = fdt_move(fdt, buf, bufsize);
if (err)
return err;
fdt_set_version(buf, 17);
fdt_set_size_dt_struct(buf, struct_size);
fdt_set_totalsize(buf, bufsize);
return 0;
}
/* Need to reorder */
newsize = ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
+ struct_size + fdt_size_dt_strings(fdt);
if (bufsize < newsize)
return -FDT_ERR_NOSPACE;
if (((buf + newsize) <= fdt)
|| (buf >= (fdt + fdt_totalsize(fdt)))) {
tmp = buf;
} else {
tmp = (void *)fdt + fdt_totalsize(fdt);
if ((tmp + newsize) > (buf + bufsize))
return -FDT_ERR_NOSPACE;
}
_packblocks(fdt, tmp, mem_rsv_size, struct_size);
memmove(buf, tmp, newsize);
fdt_set_magic(buf, FDT_MAGIC);
fdt_set_totalsize(buf, bufsize);
fdt_set_version(buf, 17);
fdt_set_last_comp_version(buf, 16);
fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
return 0;
}
int fdt_pack(void *fdt)
{
int mem_rsv_size;
int err;
err = rw_check_header(fdt);
if (err)
return err;
mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
* sizeof(struct fdt_reserve_entry);
_packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
fdt_set_totalsize(fdt, _blob_data_size(fdt));
return 0;
}