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![Andreas Gruenbacher](/assets/img/avatar_default.png)
Here is a patch that adds a new -T option to genksyms for generating dumps of the type definition that makes up the symbol version hashes. This allows to trace modversion changes back to what caused them. The dump format is the name of the type defined, followed by its definition (which is almost C): s#list_head struct list_head { s#list_head * next , * prev ; } The s#, u#, e#, and t# prefixes stand for struct, union, enum, and typedef. The exported symbols do not define types, and thus do not have an x# prefix: nfs4_acl_get_whotype int nfs4_acl_get_whotype ( char * , t#u32 ) The symbol type defintion of a single file can be generated with: make fs/jbd/journal.symtypes If KBUILD_SYMTYPES is defined, all the *.symtypes of all object files that export symbols are generated. The single *.symtypes files can be combined into a single file after a kernel build with a script like the following: for f in $(find -name '*.symtypes' | sort); do f=${f#./} echo "/* ${f%.symtypes}.o */" cat $f echo done \ | sed -e '\:UNKNOWN:d' \ -e 's:[,;] }:}:g' \ -e 's:\([[({]\) :\1:g' \ -e 's: \([])},;]\):\1:g' \ -e 's: $::' \ $f \ | awk ' /^.#/ { if (defined[$1] == $0) { print $1 next } defined[$1] = $0 } { print } ' When the kernel ABI changes, diffing individual *.symtype files, or the combined files, against each other will show which symbol changes caused the ABI changes. This can save a tremendous amount of time. Dump the types that make up modversions Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
559 lines
15 KiB
C
559 lines
15 KiB
C
/* Generate kernel symbol version hashes.
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Copyright 1996, 1997 Linux International.
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New implementation contributed by Richard Henderson <rth@tamu.edu>
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Based on original work by Bjorn Ekwall <bj0rn@blox.se>
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This file was part of the Linux modutils 2.4.22: moved back into the
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kernel sources by Rusty Russell/Kai Germaschewski.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <assert.h>
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#include <stdarg.h>
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#ifdef __GNU_LIBRARY__
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#include <getopt.h>
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#endif /* __GNU_LIBRARY__ */
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#include "genksyms.h"
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/*----------------------------------------------------------------------*/
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#define HASH_BUCKETS 4096
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static struct symbol *symtab[HASH_BUCKETS];
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static FILE *debugfile;
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int cur_line = 1;
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char *cur_filename;
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static int flag_debug, flag_dump_defs, flag_dump_types, flag_warnings;
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static const char *arch = "";
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static const char *mod_prefix = "";
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static int errors;
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static int nsyms;
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static struct symbol *expansion_trail;
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static struct symbol *visited_symbols;
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static const char *const symbol_type_name[] = {
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"normal", "typedef", "enum", "struct", "union"
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};
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static int equal_list(struct string_list *a, struct string_list *b);
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static void print_list(FILE * f, struct string_list *list);
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/*----------------------------------------------------------------------*/
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static const unsigned int crctab32[] = {
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0x00000000U, 0x77073096U, 0xee0e612cU, 0x990951baU, 0x076dc419U,
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0x706af48fU, 0xe963a535U, 0x9e6495a3U, 0x0edb8832U, 0x79dcb8a4U,
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0xe0d5e91eU, 0x97d2d988U, 0x09b64c2bU, 0x7eb17cbdU, 0xe7b82d07U,
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0x90bf1d91U, 0x1db71064U, 0x6ab020f2U, 0xf3b97148U, 0x84be41deU,
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0x1adad47dU, 0x6ddde4ebU, 0xf4d4b551U, 0x83d385c7U, 0x136c9856U,
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0x646ba8c0U, 0xfd62f97aU, 0x8a65c9ecU, 0x14015c4fU, 0x63066cd9U,
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0xfa0f3d63U, 0x8d080df5U, 0x3b6e20c8U, 0x4c69105eU, 0xd56041e4U,
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0xa2677172U, 0x3c03e4d1U, 0x4b04d447U, 0xd20d85fdU, 0xa50ab56bU,
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0x35b5a8faU, 0x42b2986cU, 0xdbbbc9d6U, 0xacbcf940U, 0x32d86ce3U,
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0x45df5c75U, 0xdcd60dcfU, 0xabd13d59U, 0x26d930acU, 0x51de003aU,
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0xc8d75180U, 0xbfd06116U, 0x21b4f4b5U, 0x56b3c423U, 0xcfba9599U,
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0xb8bda50fU, 0x2802b89eU, 0x5f058808U, 0xc60cd9b2U, 0xb10be924U,
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0x2f6f7c87U, 0x58684c11U, 0xc1611dabU, 0xb6662d3dU, 0x76dc4190U,
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0x01db7106U, 0x98d220bcU, 0xefd5102aU, 0x71b18589U, 0x06b6b51fU,
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0x9fbfe4a5U, 0xe8b8d433U, 0x7807c9a2U, 0x0f00f934U, 0x9609a88eU,
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0xe10e9818U, 0x7f6a0dbbU, 0x086d3d2dU, 0x91646c97U, 0xe6635c01U,
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0x6b6b51f4U, 0x1c6c6162U, 0x856530d8U, 0xf262004eU, 0x6c0695edU,
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0x1b01a57bU, 0x8208f4c1U, 0xf50fc457U, 0x65b0d9c6U, 0x12b7e950U,
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0x8bbeb8eaU, 0xfcb9887cU, 0x62dd1ddfU, 0x15da2d49U, 0x8cd37cf3U,
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0xfbd44c65U, 0x4db26158U, 0x3ab551ceU, 0xa3bc0074U, 0xd4bb30e2U,
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0x4adfa541U, 0x3dd895d7U, 0xa4d1c46dU, 0xd3d6f4fbU, 0x4369e96aU,
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0x346ed9fcU, 0xad678846U, 0xda60b8d0U, 0x44042d73U, 0x33031de5U,
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0xaa0a4c5fU, 0xdd0d7cc9U, 0x5005713cU, 0x270241aaU, 0xbe0b1010U,
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0xc90c2086U, 0x5768b525U, 0x206f85b3U, 0xb966d409U, 0xce61e49fU,
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0x5edef90eU, 0x29d9c998U, 0xb0d09822U, 0xc7d7a8b4U, 0x59b33d17U,
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0x2eb40d81U, 0xb7bd5c3bU, 0xc0ba6cadU, 0xedb88320U, 0x9abfb3b6U,
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0x03b6e20cU, 0x74b1d29aU, 0xead54739U, 0x9dd277afU, 0x04db2615U,
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0x73dc1683U, 0xe3630b12U, 0x94643b84U, 0x0d6d6a3eU, 0x7a6a5aa8U,
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0xe40ecf0bU, 0x9309ff9dU, 0x0a00ae27U, 0x7d079eb1U, 0xf00f9344U,
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0x8708a3d2U, 0x1e01f268U, 0x6906c2feU, 0xf762575dU, 0x806567cbU,
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0x196c3671U, 0x6e6b06e7U, 0xfed41b76U, 0x89d32be0U, 0x10da7a5aU,
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0x67dd4accU, 0xf9b9df6fU, 0x8ebeeff9U, 0x17b7be43U, 0x60b08ed5U,
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0xd6d6a3e8U, 0xa1d1937eU, 0x38d8c2c4U, 0x4fdff252U, 0xd1bb67f1U,
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0xa6bc5767U, 0x3fb506ddU, 0x48b2364bU, 0xd80d2bdaU, 0xaf0a1b4cU,
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0x36034af6U, 0x41047a60U, 0xdf60efc3U, 0xa867df55U, 0x316e8eefU,
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0x4669be79U, 0xcb61b38cU, 0xbc66831aU, 0x256fd2a0U, 0x5268e236U,
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0xcc0c7795U, 0xbb0b4703U, 0x220216b9U, 0x5505262fU, 0xc5ba3bbeU,
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0xb2bd0b28U, 0x2bb45a92U, 0x5cb36a04U, 0xc2d7ffa7U, 0xb5d0cf31U,
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0x2cd99e8bU, 0x5bdeae1dU, 0x9b64c2b0U, 0xec63f226U, 0x756aa39cU,
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0x026d930aU, 0x9c0906a9U, 0xeb0e363fU, 0x72076785U, 0x05005713U,
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0x95bf4a82U, 0xe2b87a14U, 0x7bb12baeU, 0x0cb61b38U, 0x92d28e9bU,
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0xe5d5be0dU, 0x7cdcefb7U, 0x0bdbdf21U, 0x86d3d2d4U, 0xf1d4e242U,
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0x68ddb3f8U, 0x1fda836eU, 0x81be16cdU, 0xf6b9265bU, 0x6fb077e1U,
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0x18b74777U, 0x88085ae6U, 0xff0f6a70U, 0x66063bcaU, 0x11010b5cU,
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0x8f659effU, 0xf862ae69U, 0x616bffd3U, 0x166ccf45U, 0xa00ae278U,
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0xd70dd2eeU, 0x4e048354U, 0x3903b3c2U, 0xa7672661U, 0xd06016f7U,
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0x4969474dU, 0x3e6e77dbU, 0xaed16a4aU, 0xd9d65adcU, 0x40df0b66U,
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0x37d83bf0U, 0xa9bcae53U, 0xdebb9ec5U, 0x47b2cf7fU, 0x30b5ffe9U,
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0xbdbdf21cU, 0xcabac28aU, 0x53b39330U, 0x24b4a3a6U, 0xbad03605U,
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0xcdd70693U, 0x54de5729U, 0x23d967bfU, 0xb3667a2eU, 0xc4614ab8U,
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0x5d681b02U, 0x2a6f2b94U, 0xb40bbe37U, 0xc30c8ea1U, 0x5a05df1bU,
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0x2d02ef8dU
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};
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static unsigned long partial_crc32_one(unsigned char c, unsigned long crc)
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{
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return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
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}
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static unsigned long partial_crc32(const char *s, unsigned long crc)
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{
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while (*s)
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crc = partial_crc32_one(*s++, crc);
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return crc;
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}
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static unsigned long crc32(const char *s)
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{
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return partial_crc32(s, 0xffffffff) ^ 0xffffffff;
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}
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/*----------------------------------------------------------------------*/
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static enum symbol_type map_to_ns(enum symbol_type t)
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{
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if (t == SYM_TYPEDEF)
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t = SYM_NORMAL;
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else if (t == SYM_UNION)
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t = SYM_STRUCT;
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return t;
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}
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struct symbol *find_symbol(const char *name, enum symbol_type ns)
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{
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unsigned long h = crc32(name) % HASH_BUCKETS;
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struct symbol *sym;
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for (sym = symtab[h]; sym; sym = sym->hash_next)
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if (map_to_ns(sym->type) == map_to_ns(ns) &&
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strcmp(name, sym->name) == 0)
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break;
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return sym;
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}
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struct symbol *add_symbol(const char *name, enum symbol_type type,
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struct string_list *defn, int is_extern)
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{
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unsigned long h = crc32(name) % HASH_BUCKETS;
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struct symbol *sym;
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for (sym = symtab[h]; sym; sym = sym->hash_next) {
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if (map_to_ns(sym->type) == map_to_ns(type)
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&& strcmp(name, sym->name) == 0) {
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if (!equal_list(sym->defn, defn))
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error_with_pos("redefinition of %s", name);
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return sym;
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}
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}
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sym = xmalloc(sizeof(*sym));
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sym->name = name;
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sym->type = type;
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sym->defn = defn;
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sym->expansion_trail = NULL;
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sym->visited = NULL;
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sym->is_extern = is_extern;
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sym->hash_next = symtab[h];
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symtab[h] = sym;
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if (flag_debug) {
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fprintf(debugfile, "Defn for %s %s == <",
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symbol_type_name[type], name);
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if (is_extern)
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fputs("extern ", debugfile);
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print_list(debugfile, defn);
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fputs(">\n", debugfile);
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}
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++nsyms;
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return sym;
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}
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/*----------------------------------------------------------------------*/
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void free_node(struct string_list *node)
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{
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free(node->string);
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free(node);
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}
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void free_list(struct string_list *s, struct string_list *e)
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{
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while (s != e) {
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struct string_list *next = s->next;
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free_node(s);
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s = next;
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}
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}
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struct string_list *copy_node(struct string_list *node)
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{
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struct string_list *newnode;
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newnode = xmalloc(sizeof(*newnode));
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newnode->string = xstrdup(node->string);
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newnode->tag = node->tag;
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return newnode;
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}
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static int equal_list(struct string_list *a, struct string_list *b)
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{
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while (a && b) {
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if (a->tag != b->tag || strcmp(a->string, b->string))
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return 0;
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a = a->next;
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b = b->next;
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}
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return !a && !b;
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}
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static void print_node(FILE * f, struct string_list *list)
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{
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if (list->tag != SYM_NORMAL) {
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putc(symbol_type_name[list->tag][0], f);
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putc('#', f);
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}
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fputs(list->string, f);
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}
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static void print_list(FILE * f, struct string_list *list)
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{
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struct string_list **e, **b;
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struct string_list *tmp, **tmp2;
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int elem = 1;
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if (list == NULL) {
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fputs("(nil)", f);
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return;
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}
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tmp = list;
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while ((tmp = tmp->next) != NULL)
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elem++;
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b = alloca(elem * sizeof(*e));
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e = b + elem;
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tmp2 = e - 1;
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(*tmp2--) = list;
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while ((list = list->next) != NULL)
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*(tmp2--) = list;
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while (b != e) {
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print_node(f, *b++);
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putc(' ', f);
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}
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}
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static unsigned long expand_and_crc_sym(struct symbol *sym, unsigned long crc)
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{
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struct string_list *list = sym->defn;
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struct string_list **e, **b;
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struct string_list *tmp, **tmp2;
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int elem = 1;
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if (!list)
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return crc;
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tmp = list;
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while ((tmp = tmp->next) != NULL)
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elem++;
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b = alloca(elem * sizeof(*e));
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e = b + elem;
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tmp2 = e - 1;
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*(tmp2--) = list;
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while ((list = list->next) != NULL)
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*(tmp2--) = list;
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while (b != e) {
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struct string_list *cur;
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struct symbol *subsym;
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cur = *(b++);
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switch (cur->tag) {
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case SYM_NORMAL:
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if (flag_dump_defs)
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fprintf(debugfile, "%s ", cur->string);
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crc = partial_crc32(cur->string, crc);
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crc = partial_crc32_one(' ', crc);
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break;
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case SYM_TYPEDEF:
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subsym = find_symbol(cur->string, cur->tag);
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if (subsym->expansion_trail) {
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if (flag_dump_defs)
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fprintf(debugfile, "%s ", cur->string);
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crc = partial_crc32(cur->string, crc);
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crc = partial_crc32_one(' ', crc);
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} else {
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subsym->expansion_trail = expansion_trail;
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expansion_trail = subsym;
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crc = expand_and_crc_sym(subsym, crc);
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}
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break;
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case SYM_STRUCT:
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case SYM_UNION:
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case SYM_ENUM:
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subsym = find_symbol(cur->string, cur->tag);
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if (!subsym) {
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struct string_list *n, *t = NULL;
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error_with_pos("expand undefined %s %s",
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symbol_type_name[cur->tag],
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cur->string);
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n = xmalloc(sizeof(*n));
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n->string = xstrdup(symbol_type_name[cur->tag]);
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n->tag = SYM_NORMAL;
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n->next = t;
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t = n;
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n = xmalloc(sizeof(*n));
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n->string = xstrdup(cur->string);
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n->tag = SYM_NORMAL;
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n->next = t;
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t = n;
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n = xmalloc(sizeof(*n));
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n->string = xstrdup("{ UNKNOWN }");
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n->tag = SYM_NORMAL;
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n->next = t;
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subsym =
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add_symbol(cur->string, cur->tag, n, 0);
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}
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if (subsym->expansion_trail) {
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if (flag_dump_defs) {
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fprintf(debugfile, "%s %s ",
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symbol_type_name[cur->tag],
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cur->string);
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}
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crc = partial_crc32(symbol_type_name[cur->tag],
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crc);
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crc = partial_crc32_one(' ', crc);
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crc = partial_crc32(cur->string, crc);
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crc = partial_crc32_one(' ', crc);
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} else {
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subsym->expansion_trail = expansion_trail;
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expansion_trail = subsym;
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crc = expand_and_crc_sym(subsym, crc);
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}
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break;
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}
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}
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{
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static struct symbol **end = &visited_symbols;
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if (!sym->visited) {
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*end = sym;
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end = &sym->visited;
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sym->visited = (struct symbol *)-1L;
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}
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}
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return crc;
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}
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void export_symbol(const char *name)
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{
|
|
struct symbol *sym;
|
|
|
|
sym = find_symbol(name, SYM_NORMAL);
|
|
if (!sym)
|
|
error_with_pos("export undefined symbol %s", name);
|
|
else {
|
|
unsigned long crc;
|
|
|
|
if (flag_dump_defs)
|
|
fprintf(debugfile, "Export %s == <", name);
|
|
|
|
expansion_trail = (struct symbol *)-1L;
|
|
|
|
crc = expand_and_crc_sym(sym, 0xffffffff) ^ 0xffffffff;
|
|
|
|
sym = expansion_trail;
|
|
while (sym != (struct symbol *)-1L) {
|
|
struct symbol *n = sym->expansion_trail;
|
|
sym->expansion_trail = 0;
|
|
sym = n;
|
|
}
|
|
|
|
if (flag_dump_defs)
|
|
fputs(">\n", debugfile);
|
|
|
|
/* Used as a linker script. */
|
|
printf("%s__crc_%s = 0x%08lx ;\n", mod_prefix, name, crc);
|
|
}
|
|
}
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
void error_with_pos(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
if (flag_warnings) {
|
|
fprintf(stderr, "%s:%d: ", cur_filename ? : "<stdin>",
|
|
cur_line);
|
|
|
|
va_start(args, fmt);
|
|
vfprintf(stderr, fmt, args);
|
|
va_end(args);
|
|
putc('\n', stderr);
|
|
|
|
errors++;
|
|
}
|
|
}
|
|
|
|
static void genksyms_usage(void)
|
|
{
|
|
fputs("Usage:\n" "genksyms [-dDwqhV] > /path/to/.tmp_obj.ver\n" "\n"
|
|
#ifdef __GNU_LIBRARY__
|
|
" -d, --debug Increment the debug level (repeatable)\n"
|
|
" -D, --dump Dump expanded symbol defs (for debugging only)\n"
|
|
" -w, --warnings Enable warnings\n"
|
|
" -q, --quiet Disable warnings (default)\n"
|
|
" -h, --help Print this message\n"
|
|
" -V, --version Print the release version\n"
|
|
#else /* __GNU_LIBRARY__ */
|
|
" -d Increment the debug level (repeatable)\n"
|
|
" -D Dump expanded symbol defs (for debugging only)\n"
|
|
" -w Enable warnings\n"
|
|
" -q Disable warnings (default)\n"
|
|
" -h Print this message\n"
|
|
" -V Print the release version\n"
|
|
#endif /* __GNU_LIBRARY__ */
|
|
, stderr);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
FILE *dumpfile = NULL;
|
|
int o;
|
|
|
|
#ifdef __GNU_LIBRARY__
|
|
struct option long_opts[] = {
|
|
{"arch", 1, 0, 'a'},
|
|
{"debug", 0, 0, 'd'},
|
|
{"warnings", 0, 0, 'w'},
|
|
{"quiet", 0, 0, 'q'},
|
|
{"dump", 0, 0, 'D'},
|
|
{"dump-types", 1, 0, 'T'},
|
|
{"version", 0, 0, 'V'},
|
|
{"help", 0, 0, 'h'},
|
|
{0, 0, 0, 0}
|
|
};
|
|
|
|
while ((o = getopt_long(argc, argv, "a:dwqVDT:k:p:",
|
|
&long_opts[0], NULL)) != EOF)
|
|
#else /* __GNU_LIBRARY__ */
|
|
while ((o = getopt(argc, argv, "a:dwqVDT:k:p:")) != EOF)
|
|
#endif /* __GNU_LIBRARY__ */
|
|
switch (o) {
|
|
case 'a':
|
|
arch = optarg;
|
|
break;
|
|
case 'd':
|
|
flag_debug++;
|
|
break;
|
|
case 'w':
|
|
flag_warnings = 1;
|
|
break;
|
|
case 'q':
|
|
flag_warnings = 0;
|
|
break;
|
|
case 'V':
|
|
fputs("genksyms version 2.5.60\n", stderr);
|
|
break;
|
|
case 'D':
|
|
flag_dump_defs = 1;
|
|
break;
|
|
case 'T':
|
|
flag_dump_types = 1;
|
|
dumpfile = fopen(optarg, "w");
|
|
if (!dumpfile) {
|
|
perror(optarg);
|
|
return 1;
|
|
}
|
|
break;
|
|
case 'h':
|
|
genksyms_usage();
|
|
return 0;
|
|
default:
|
|
genksyms_usage();
|
|
return 1;
|
|
}
|
|
if ((strcmp(arch, "v850") == 0) || (strcmp(arch, "h8300") == 0))
|
|
mod_prefix = "_";
|
|
{
|
|
extern int yydebug;
|
|
extern int yy_flex_debug;
|
|
|
|
yydebug = (flag_debug > 1);
|
|
yy_flex_debug = (flag_debug > 2);
|
|
|
|
debugfile = stderr;
|
|
/* setlinebuf(debugfile); */
|
|
}
|
|
|
|
yyparse();
|
|
|
|
if (flag_dump_types && visited_symbols) {
|
|
while (visited_symbols != (struct symbol *)-1L) {
|
|
struct symbol *sym = visited_symbols;
|
|
|
|
if (sym->type != SYM_NORMAL) {
|
|
putc(symbol_type_name[sym->type][0], dumpfile);
|
|
putc('#', dumpfile);
|
|
}
|
|
fputs(sym->name, dumpfile);
|
|
putc(' ', dumpfile);
|
|
print_list(dumpfile, sym->defn);
|
|
putc('\n', dumpfile);
|
|
|
|
visited_symbols = sym->visited;
|
|
sym->visited = NULL;
|
|
}
|
|
}
|
|
|
|
if (flag_debug) {
|
|
fprintf(debugfile, "Hash table occupancy %d/%d = %g\n",
|
|
nsyms, HASH_BUCKETS,
|
|
(double)nsyms / (double)HASH_BUCKETS);
|
|
}
|
|
|
|
return errors != 0;
|
|
}
|