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Update libfdt to github:f1879e1

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Pulls in a patch, now upstreamed, from nwhitehorn to add limited read-only
support for older (v2 and v3) FDT blobs.
This commit is contained in:
Kyle Evans 2018-01-27 21:22:10 +00:00
parent fd06f809db
commit 470576098a
4 changed files with 144 additions and 17 deletions
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3
fdt.c
View File

@ -123,6 +123,9 @@ uint32_t fdt_next_tag(const void *fdt, int startoffset, int *nextoffset)
/* skip-name offset, length and value */
offset += sizeof(struct fdt_property) - FDT_TAGSIZE
+ fdt32_to_cpu(*lenp);
if (fdt_version(fdt) < 0x10 && fdt32_to_cpu(*lenp) >= 8 &&
((offset - fdt32_to_cpu(*lenp)) % 8) != 0)
offset += 4;
break;
case FDT_END:

51
fdt_overlay.c
View File

@ -1,3 +1,54 @@
/*
* libfdt - Flat Device Tree manipulation
* Copyright (C) 2016 Free Electrons
* Copyright (C) 2016 NextThing Co.
*
* 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>

102
fdt_ro.c
View File

@ -58,9 +58,10 @@
static int fdt_nodename_eq_(const void *fdt, int offset,
const char *s, int len)
{
const char *p = fdt_offset_ptr(fdt, offset + FDT_TAGSIZE, len+1);
int olen;
const char *p = fdt_get_name(fdt, offset, &olen);
if (!p)
if (!p || olen < len)
/* short match */
return 0;
@ -233,16 +234,34 @@ int fdt_path_offset(const void *fdt, const char *path)
const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
{
const struct fdt_node_header *nh = fdt_offset_ptr_(fdt, nodeoffset);
const char *nameptr;
int err;
if (((err = fdt_check_header(fdt)) != 0)
|| ((err = fdt_check_node_offset_(fdt, nodeoffset)) < 0))
goto fail;
if (len)
*len = strlen(nh->name);
nameptr = nh->name;
return nh->name;
if (fdt_version(fdt) < 0x10) {
/*
* For old FDT versions, match the naming conventions of V16:
* give only the leaf name (after all /). The actual tree
* contents are loosely checked.
*/
const char *leaf;
leaf = strrchr(nameptr, '/');
if (leaf == NULL) {
err = -FDT_ERR_BADSTRUCTURE;
goto fail;
}
nameptr = leaf+1;
}
if (len)
*len = strlen(nameptr);
return nameptr;
fail:
if (len)
@ -268,9 +287,9 @@ int fdt_next_property_offset(const void *fdt, int offset)
return nextprop_(fdt, offset);
}
const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
int offset,
int *lenp)
static const struct fdt_property *fdt_get_property_by_offset_(const void *fdt,
int offset,
int *lenp)
{
int err;
const struct fdt_property *prop;
@ -289,23 +308,44 @@ const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
return prop;
}
const struct fdt_property *fdt_get_property_namelen(const void *fdt,
int offset,
const char *name,
int namelen, int *lenp)
const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
int offset,
int *lenp)
{
/* Prior to version 16, properties may need realignment
* and this API does not work. fdt_getprop_*() will, however. */
if (fdt_version(fdt) < 0x10) {
if (lenp)
*lenp = -FDT_ERR_BADVERSION;
return NULL;
}
return fdt_get_property_by_offset_(fdt, offset, lenp);
}
static const struct fdt_property *fdt_get_property_namelen_(const void *fdt,
int offset,
const char *name,
int namelen,
int *lenp,
int *poffset)
{
for (offset = fdt_first_property_offset(fdt, offset);
(offset >= 0);
(offset = fdt_next_property_offset(fdt, offset))) {
const struct fdt_property *prop;
if (!(prop = fdt_get_property_by_offset(fdt, offset, lenp))) {
if (!(prop = fdt_get_property_by_offset_(fdt, offset, lenp))) {
offset = -FDT_ERR_INTERNAL;
break;
}
if (fdt_string_eq_(fdt, fdt32_to_cpu(prop->nameoff),
name, namelen))
name, namelen)) {
if (poffset)
*poffset = offset;
return prop;
}
}
if (lenp)
@ -313,6 +353,25 @@ const struct fdt_property *fdt_get_property_namelen(const void *fdt,
return NULL;
}
const struct fdt_property *fdt_get_property_namelen(const void *fdt,
int offset,
const char *name,
int namelen, int *lenp)
{
/* Prior to version 16, properties may need realignment
* and this API does not work. fdt_getprop_*() will, however. */
if (fdt_version(fdt) < 0x10) {
if (lenp)
*lenp = -FDT_ERR_BADVERSION;
return NULL;
}
return fdt_get_property_namelen_(fdt, offset, name, namelen, lenp,
NULL);
}
const struct fdt_property *fdt_get_property(const void *fdt,
int nodeoffset,
const char *name, int *lenp)
@ -324,12 +383,18 @@ const struct fdt_property *fdt_get_property(const void *fdt,
const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
const char *name, int namelen, int *lenp)
{
int poffset;
const struct fdt_property *prop;
prop = fdt_get_property_namelen(fdt, nodeoffset, name, namelen, lenp);
prop = fdt_get_property_namelen_(fdt, nodeoffset, name, namelen, lenp,
&poffset);
if (!prop)
return NULL;
/* Handle realignment */
if (fdt_version(fdt) < 0x10 && (poffset + sizeof(*prop)) % 8 &&
fdt32_to_cpu(prop->len) >= 8)
return prop->data + 4;
return prop->data;
}
@ -338,11 +403,16 @@ const void *fdt_getprop_by_offset(const void *fdt, int offset,
{
const struct fdt_property *prop;
prop = fdt_get_property_by_offset(fdt, offset, lenp);
prop = fdt_get_property_by_offset_(fdt, offset, lenp);
if (!prop)
return NULL;
if (namep)
*namep = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
/* Handle realignment */
if (fdt_version(fdt) < 0x10 && (offset + sizeof(*prop)) % 8 &&
fdt32_to_cpu(prop->len) >= 8)
return prop->data + 4;
return prop->data;
}

5
libfdt.h
View File

@ -54,7 +54,7 @@
#include <libfdt_env.h>
#include <fdt.h>
#define FDT_FIRST_SUPPORTED_VERSION 0x10
#define FDT_FIRST_SUPPORTED_VERSION 0x02
#define FDT_LAST_SUPPORTED_VERSION 0x11
/* Error codes: informative error codes */
@ -527,6 +527,9 @@ int fdt_next_property_offset(const void *fdt, int offset);
* offset. If lenp is non-NULL, the length of the property value is
* also returned, in the integer pointed to by lenp.
*
* Note that this code only works on device tree versions >= 16. fdt_getprop()
* works on all versions.
*
* returns:
* pointer to the structure representing the property
* if lenp is non-NULL, *lenp contains the length of the property