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authorAndreas Gruenbacher <agruen@suse.de>2006-05-09 20:37:30 +0200
committerSam Ravnborg <sam@mars.ravnborg.org>2006-06-24 23:42:46 +0200
commit15fde6751886fd972a64ed65ba49db309919c504 (patch)
tree513c1eec2135f65ba0d980627346f7c07ad2b897 /scripts
parent3041e47e8b08d51188b2cbdbd9c1e6f43314c8f1 (diff)
kbuild: support for %.symtypes files
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>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/Makefile.build12
-rw-r--r--scripts/genksyms/genksyms.c77
-rw-r--r--scripts/genksyms/genksyms.h1
3 files changed, 63 insertions, 27 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index e8e7d27cfc9..3cb445cc743 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -140,6 +140,15 @@ cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
%.i: %.c FORCE
$(call if_changed_dep,cc_i_c)
+quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
+cmd_cc_symtypes_c = \
+ $(CPP) -D__GENKSYMS__ $(c_flags) $< \
+ | $(GENKSYMS) -T $@ >/dev/null; \
+ test -s $@ || rm -f $@
+
+%.symtypes : %.c FORCE
+ $(call if_changed_dep,cc_symtypes_c)
+
# C (.c) files
# The C file is compiled and updated dependency information is generated.
# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
@@ -166,7 +175,8 @@ cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
cmd_modversions = \
if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
$(CPP) -D__GENKSYMS__ $(c_flags) $< \
- | $(GENKSYMS) -a $(ARCH) \
+ | $(GENKSYMS) $(if $(KBUILD_SYMTYPES), \
+ -T $(@D)/$(@F:.o=.symtypes)) -a $(ARCH) \
> $(@D)/.tmp_$(@F:.o=.ver); \
\
$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
diff --git a/scripts/genksyms/genksyms.c b/scripts/genksyms/genksyms.c
index 5b0344e20d6..b0381823e40 100644
--- a/scripts/genksyms/genksyms.c
+++ b/scripts/genksyms/genksyms.c
@@ -42,7 +42,7 @@ static FILE *debugfile;
int cur_line = 1;
char *cur_filename;
-static int flag_debug, flag_dump_defs, flag_warnings;
+static int flag_debug, flag_dump_defs, flag_dump_types, flag_warnings;
static const char *arch = "";
static const char *mod_prefix = "";
@@ -50,6 +50,7 @@ static int errors;
static int nsyms;
static struct symbol *expansion_trail;
+static struct symbol *visited_symbols;
static const char *const symbol_type_name[] = {
"normal", "typedef", "enum", "struct", "union"
@@ -176,6 +177,7 @@ struct symbol *add_symbol(const char *name, enum symbol_type type,
sym->type = type;
sym->defn = defn;
sym->expansion_trail = NULL;
+ sym->visited = NULL;
sym->is_extern = is_extern;
sym->hash_next = symtab[h];
@@ -236,26 +238,11 @@ static int equal_list(struct string_list *a, struct string_list *b)
static void print_node(FILE * f, struct string_list *list)
{
- switch (list->tag) {
- case SYM_STRUCT:
- putc('s', f);
- goto printit;
- case SYM_UNION:
- putc('u', f);
- goto printit;
- case SYM_ENUM:
- putc('e', f);
- goto printit;
- case SYM_TYPEDEF:
- putc('t', f);
- goto printit;
-
- printit:
+ if (list->tag != SYM_NORMAL) {
+ putc(symbol_type_name[list->tag][0], f);
putc('#', f);
- case SYM_NORMAL:
- fputs(list->string, f);
- break;
}
+ fputs(list->string, f);
}
static void print_list(FILE * f, struct string_list *list)
@@ -287,9 +274,9 @@ static void print_list(FILE * f, struct string_list *list)
}
}
-static unsigned long expand_and_crc_list(struct string_list *list,
- unsigned long crc)
+static unsigned long expand_and_crc_sym(struct symbol *sym, unsigned long crc)
{
+ struct string_list *list = sym->defn;
struct string_list **e, **b;
struct string_list *tmp, **tmp2;
int elem = 1;
@@ -332,7 +319,7 @@ static unsigned long expand_and_crc_list(struct string_list *list,
} else {
subsym->expansion_trail = expansion_trail;
expansion_trail = subsym;
- crc = expand_and_crc_list(subsym->defn, crc);
+ crc = expand_and_crc_sym(subsym, crc);
}
break;
@@ -382,12 +369,22 @@ static unsigned long expand_and_crc_list(struct string_list *list,
} else {
subsym->expansion_trail = expansion_trail;
expansion_trail = subsym;
- crc = expand_and_crc_list(subsym->defn, crc);
+ crc = expand_and_crc_sym(subsym, crc);
}
break;
}
}
+ {
+ static struct symbol **end = &visited_symbols;
+
+ if (!sym->visited) {
+ *end = sym;
+ end = &sym->visited;
+ sym->visited = (struct symbol *)-1L;
+ }
+ }
+
return crc;
}
@@ -406,7 +403,7 @@ void export_symbol(const char *name)
expansion_trail = (struct symbol *)-1L;
- crc = expand_and_crc_list(sym->defn, 0xffffffff) ^ 0xffffffff;
+ crc = expand_and_crc_sym(sym, 0xffffffff) ^ 0xffffffff;
sym = expansion_trail;
while (sym != (struct symbol *)-1L) {
@@ -464,6 +461,7 @@ static void genksyms_usage(void)
int main(int argc, char **argv)
{
+ FILE *dumpfile = NULL;
int o;
#ifdef __GNU_LIBRARY__
@@ -473,15 +471,16 @@ int main(int argc, char **argv)
{"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:dwqVDk:p:",
+ while ((o = getopt_long(argc, argv, "a:dwqVDT:k:p:",
&long_opts[0], NULL)) != EOF)
#else /* __GNU_LIBRARY__ */
- while ((o = getopt(argc, argv, "a:dwqVDk:p:")) != EOF)
+ while ((o = getopt(argc, argv, "a:dwqVDT:k:p:")) != EOF)
#endif /* __GNU_LIBRARY__ */
switch (o) {
case 'a':
@@ -502,6 +501,14 @@ int main(int argc, char **argv)
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;
@@ -524,6 +531,24 @@ int main(int argc, char **argv)
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,
diff --git a/scripts/genksyms/genksyms.h b/scripts/genksyms/genksyms.h
index ab6f34f3873..2668287aa49 100644
--- a/scripts/genksyms/genksyms.h
+++ b/scripts/genksyms/genksyms.h
@@ -41,6 +41,7 @@ struct symbol {
enum symbol_type type;
struct string_list *defn;
struct symbol *expansion_trail;
+ struct symbol *visited;
int is_extern;
};