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allow stripping of generated symbols under CONFIG_KALLSYMS_ALL 

Building upon parts of the module stripping patch, this patch
introduces similar stripping for vmlinux when CONFIG_KALLSYMS_ALL=y.
Using CONFIG_KALLSYMS_STRIP_GENERATED reduces the overhead of
CONFIG_KALLSYMS_ALL from 245k/310k to 65k/80k for the (i386/x86-64)
kernels I tested with.

The patch also does away with the need to special case the kallsyms-
internal symbols by making them available even in the first linking
stage.

While it is a generated file, the patch includes the changes to
scripts/genksyms/keywords.c_shipped, as I'm unsure what the procedure
here is.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Jan Beulich 2008-12-16 11:30:08 +00:00 committed by Sam Ravnborg
parent ad7a953c52
commit 9bb482476c
7 changed files with 176 additions and 149 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
Makefile
View File

@ -604,6 +604,9 @@ export INSTALL_PATH ?= /boot
MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
export MODLIB
strip-symbols := $(srctree)/scripts/strip-symbols \
$(wildcard $(srctree)/arch/$(ARCH)/scripts/strip-symbols)
#
# INSTALL_MOD_STRIP, if defined, will cause modules to be stripped while
# they get installed. If INSTALL_MOD_STRIP is '1', then the default
@ -611,8 +614,10 @@ export MODLIB
# be used as the option(s) to the objcopy command.
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
mod_strip_cmd = $(OBJCOPY) --strip-debug --strip-symbols \
$(srctree)/scripts/strip-symbols --wildcard
mod_strip_cmd = $(OBJCOPY) --strip-debug
ifeq ($(CONFIG_KALLSYMS_ALL),$(CONFIG_KALLSYMS_STRIP_GENERATED))
mod_strip_cmd += --wildcard $(addprefix --strip-symbols ,$(strip-symbols))
endif
else
mod_strip_cmd = $(OBJCOPY) $(INSTALL_MOD_STRIP)
endif # INSTALL_MOD_STRIP=1
@ -747,6 +752,7 @@ last_kallsyms := 2
endif
kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
kallsyms.h := $(wildcard include/config/kallsyms/*.h) $(wildcard include/config/kallsyms/*/*.h)
define verify_kallsyms
$(Q)$(if $($(quiet)cmd_sysmap), \
@ -771,24 +777,41 @@ endef
# Generate .S file with all kernel symbols
quiet_cmd_kallsyms = KSYM $@
cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
$(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
cmd_kallsyms = { test $* -eq 0 || $(NM) -n $<; } \
| $(KALLSYMS) $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) >$@
.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
quiet_cmd_kstrip = STRIP $@
cmd_kstrip = $(OBJCOPY) --wildcard $(addprefix --strip$(if $(CONFIG_RELOCATABLE),-unneeded)-symbols ,$(filter %/scripts/strip-symbols,$^)) $< $@
$(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): KBUILD_AFLAGS += -Wa,--strip-local-absolute
$(foreach n,0 1 2 3,.tmp_kallsyms$(n).o): %.o: %.S scripts FORCE
$(call if_changed_dep,as_o_S)
.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
ifeq ($(CONFIG_KALLSYMS_STRIP_GENERATED),y)
strip-ext := .stripped
endif
.tmp_kallsyms%.S: .tmp_vmlinux%$(strip-ext) $(KALLSYMS) $(kallsyms.h)
$(call cmd,kallsyms)
# make -jN seems to have problems with intermediate files, see bug #3330.
.SECONDARY: $(foreach n,1 2 3,.tmp_vmlinux$(n).stripped)
.tmp_vmlinux%.stripped: .tmp_vmlinux% $(strip-symbols) $(kallsyms.h)
$(call cmd,kstrip)
ifneq ($(CONFIG_DEBUG_INFO),y)
.tmp_vmlinux%: LDFLAGS_vmlinux += -S
endif
# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
$(call if_changed_rule,ksym_ld)
.tmp_vmlinux%: $(vmlinux-lds) $(vmlinux-all) FORCE
$(if $(filter 1,$*),$(call if_changed_rule,ksym_ld),$(call if_changed,vmlinux__))
.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
$(call if_changed,vmlinux__)
.tmp_vmlinux0$(strip-ext):
$(Q)echo "placeholder" >$@
.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
$(call if_changed,vmlinux__)
.tmp_vmlinux1: .tmp_kallsyms0.o
.tmp_vmlinux2: .tmp_kallsyms1.o
.tmp_vmlinux3: .tmp_kallsyms2.o
# Needs to visit scripts/ before $(KALLSYMS) can be used.
$(KALLSYMS): scripts ;

1
arch/x86/scripts/strip-symbols Normal file
View File

@ -0,0 +1 @@
__cpu_vendor_dev_X86_VENDOR_*

7
init/Kconfig
View File

@ -588,6 +588,13 @@ config KALLSYMS_ALL
Say N.
config KALLSYMS_STRIP_GENERATED
bool "Strip machine generated symbols from kallsyms"
depends on KALLSYMS_ALL
default y
help
Say N if you want kallsyms to retain even machine generated symbols.
config KALLSYMS_EXTRA_PASS
bool "Do an extra kallsyms pass"
depends on KALLSYMS

16
kernel/kallsyms.c
View File

@ -30,20 +30,19 @@
#define all_var 0
#endif
/* These will be re-linked against their real values during the second link stage */
extern const unsigned long kallsyms_addresses[] __attribute__((weak));
extern const u8 kallsyms_names[] __attribute__((weak));
extern const unsigned long kallsyms_addresses[];
extern const u8 kallsyms_names[];
/* tell the compiler that the count isn't in the small data section if the arch
* has one (eg: FRV)
*/
extern const unsigned long kallsyms_num_syms
__attribute__((weak, section(".rodata")));
__attribute__((__section__(".rodata")));
extern const u8 kallsyms_token_table[] __attribute__((weak));
extern const u16 kallsyms_token_index[] __attribute__((weak));
extern const u8 kallsyms_token_table[];
extern const u16 kallsyms_token_index[];
extern const unsigned long kallsyms_markers[] __attribute__((weak));
extern const unsigned long kallsyms_markers[];
static inline int is_kernel_inittext(unsigned long addr)
{
@ -168,9 +167,6 @@ static unsigned long get_symbol_pos(unsigned long addr,
unsigned long symbol_start = 0, symbol_end = 0;
unsigned long i, low, high, mid;
/* This kernel should never had been booted. */
BUG_ON(!kallsyms_addresses);
/* do a binary search on the sorted kallsyms_addresses array */
low = 0;
high = kallsyms_num_syms;

231
scripts/genksyms/keywords.c_shipped
View File

@ -1,4 +1,4 @@
/* ANSI-C code produced by gperf version 3.0.2 */
/* ANSI-C code produced by gperf version 3.0.1 */
/* Command-line: gperf -L ANSI-C -a -C -E -g -H is_reserved_hash -k '1,3,$' -N is_reserved_word -p -t scripts/genksyms/keywords.gperf */
#if !((' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
@ -32,7 +32,7 @@
#line 3 "scripts/genksyms/keywords.gperf"
struct resword { const char *name; int token; };
/* maximum key range = 62, duplicates = 0 */
/* maximum key range = 64, duplicates = 0 */
#ifdef __GNUC__
__inline
@ -46,32 +46,32 @@ is_reserved_hash (register const char *str, register unsigned int len)
{
static const unsigned char asso_values[] =
{
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 5,
65, 65, 65, 65, 65, 65, 35, 65, 65, 65,
0, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 0, 65, 0, 65, 5,
20, 15, 10, 30, 65, 15, 65, 65, 20, 0,
10, 35, 20, 65, 10, 5, 0, 10, 5, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 0,
67, 67, 67, 67, 67, 67, 15, 67, 67, 67,
0, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 0, 67, 0, 67, 5,
25, 20, 15, 30, 67, 15, 67, 67, 10, 0,
10, 40, 20, 67, 10, 5, 0, 10, 15, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67, 67, 67, 67, 67,
67, 67, 67, 67, 67, 67
};
return len + asso_values[(unsigned char)str[2]] + asso_values[(unsigned char)str[0]] + asso_values[(unsigned char)str[len - 1]];
}
@ -84,116 +84,119 @@ is_reserved_word (register const char *str, register unsigned int len)
{
enum
{
TOTAL_KEYWORDS = 43,
TOTAL_KEYWORDS = 45,
MIN_WORD_LENGTH = 3,
MAX_WORD_LENGTH = 24,
MIN_HASH_VALUE = 3,
MAX_HASH_VALUE = 64
MAX_HASH_VALUE = 66
};
static const struct resword wordlist[] =
{
{""}, {""}, {""},
#line 26 "scripts/genksyms/keywords.gperf"
#line 28 "scripts/genksyms/keywords.gperf"
{"asm", ASM_KEYW},
{""},
#line 8 "scripts/genksyms/keywords.gperf"
#line 10 "scripts/genksyms/keywords.gperf"
{"__asm", ASM_KEYW},
{""},
#line 9 "scripts/genksyms/keywords.gperf"
#line 11 "scripts/genksyms/keywords.gperf"
{"__asm__", ASM_KEYW},
{""}, {""},
#line 52 "scripts/genksyms/keywords.gperf"
#line 54 "scripts/genksyms/keywords.gperf"
{"__typeof__", TYPEOF_KEYW},
{""},
#line 12 "scripts/genksyms/keywords.gperf"
{"__const", CONST_KEYW},
#line 11 "scripts/genksyms/keywords.gperf"
{"__attribute__", ATTRIBUTE_KEYW},
#line 13 "scripts/genksyms/keywords.gperf"
{"__const__", CONST_KEYW},
#line 18 "scripts/genksyms/keywords.gperf"
{"__signed__", SIGNED_KEYW},
#line 44 "scripts/genksyms/keywords.gperf"
{"static", STATIC_KEYW},
#line 20 "scripts/genksyms/keywords.gperf"
{"__volatile__", VOLATILE_KEYW},
#line 39 "scripts/genksyms/keywords.gperf"
{"int", INT_KEYW},
#line 32 "scripts/genksyms/keywords.gperf"
{"char", CHAR_KEYW},
#line 33 "scripts/genksyms/keywords.gperf"
{"const", CONST_KEYW},
#line 45 "scripts/genksyms/keywords.gperf"
{"struct", STRUCT_KEYW},
#line 24 "scripts/genksyms/keywords.gperf"
{"__restrict__", RESTRICT_KEYW},
#line 25 "scripts/genksyms/keywords.gperf"
{"restrict", RESTRICT_KEYW},
#line 23 "scripts/genksyms/keywords.gperf"
{"_restrict", RESTRICT_KEYW},
#line 16 "scripts/genksyms/keywords.gperf"
{"__inline__", INLINE_KEYW},
#line 10 "scripts/genksyms/keywords.gperf"
{"__attribute", ATTRIBUTE_KEYW},
{""},
#line 14 "scripts/genksyms/keywords.gperf"
{"__extension__", EXTENSION_KEYW},
#line 35 "scripts/genksyms/keywords.gperf"
{"enum", ENUM_KEYW},
#line 19 "scripts/genksyms/keywords.gperf"
{"__volatile", VOLATILE_KEYW},
#line 36 "scripts/genksyms/keywords.gperf"
{"extern", EXTERN_KEYW},
{"__const", CONST_KEYW},
#line 13 "scripts/genksyms/keywords.gperf"
{"__attribute__", ATTRIBUTE_KEYW},
#line 15 "scripts/genksyms/keywords.gperf"
{"__const__", CONST_KEYW},
#line 20 "scripts/genksyms/keywords.gperf"
{"__signed__", SIGNED_KEYW},
#line 46 "scripts/genksyms/keywords.gperf"
{"static", STATIC_KEYW},
{""},
#line 17 "scripts/genksyms/keywords.gperf"
{"__signed", SIGNED_KEYW},
#line 41 "scripts/genksyms/keywords.gperf"
{"int", INT_KEYW},
#line 34 "scripts/genksyms/keywords.gperf"
{"char", CHAR_KEYW},
#line 35 "scripts/genksyms/keywords.gperf"
{"const", CONST_KEYW},
#line 47 "scripts/genksyms/keywords.gperf"
{"struct", STRUCT_KEYW},
#line 26 "scripts/genksyms/keywords.gperf"
{"__restrict__", RESTRICT_KEYW},
#line 27 "scripts/genksyms/keywords.gperf"
{"restrict", RESTRICT_KEYW},
#line 7 "scripts/genksyms/keywords.gperf"
{"EXPORT_SYMBOL_GPL_FUTURE", EXPORT_SYMBOL_KEYW},
{""},
#line 51 "scripts/genksyms/keywords.gperf"
{"typeof", TYPEOF_KEYW},
#line 46 "scripts/genksyms/keywords.gperf"
{"typedef", TYPEDEF_KEYW},
#line 15 "scripts/genksyms/keywords.gperf"
{"__inline", INLINE_KEYW},
#line 31 "scripts/genksyms/keywords.gperf"
{"auto", AUTO_KEYW},
#line 47 "scripts/genksyms/keywords.gperf"
{"union", UNION_KEYW},
{""}, {""},
#line 48 "scripts/genksyms/keywords.gperf"
{"unsigned", UNSIGNED_KEYW},
#line 49 "scripts/genksyms/keywords.gperf"
{"void", VOID_KEYW},
#line 42 "scripts/genksyms/keywords.gperf"
{"short", SHORT_KEYW},
{""}, {""},
#line 50 "scripts/genksyms/keywords.gperf"
{"volatile", VOLATILE_KEYW},
{""},
#line 37 "scripts/genksyms/keywords.gperf"
{"float", FLOAT_KEYW},
#line 34 "scripts/genksyms/keywords.gperf"
{"double", DOUBLE_KEYW},
{""},
#line 5 "scripts/genksyms/keywords.gperf"
{"EXPORT_SYMBOL", EXPORT_SYMBOL_KEYW},
{""}, {""},
#line 38 "scripts/genksyms/keywords.gperf"
{"inline", INLINE_KEYW},
#line 6 "scripts/genksyms/keywords.gperf"
{"EXPORT_SYMBOL_GPL", EXPORT_SYMBOL_KEYW},
#line 41 "scripts/genksyms/keywords.gperf"
{"register", REGISTER_KEYW},
#line 18 "scripts/genksyms/keywords.gperf"
{"__inline__", INLINE_KEYW},
{""},
#line 22 "scripts/genksyms/keywords.gperf"
{"_Bool", BOOL_KEYW},
#line 43 "scripts/genksyms/keywords.gperf"
{"signed", SIGNED_KEYW},
{"__volatile__", VOLATILE_KEYW},
#line 5 "scripts/genksyms/keywords.gperf"
{"EXPORT_SYMBOL", EXPORT_SYMBOL_KEYW},
#line 25 "scripts/genksyms/keywords.gperf"
{"_restrict", RESTRICT_KEYW},
{""},
#line 12 "scripts/genksyms/keywords.gperf"
{"__attribute", ATTRIBUTE_KEYW},
#line 6 "scripts/genksyms/keywords.gperf"
{"EXPORT_SYMBOL_GPL", EXPORT_SYMBOL_KEYW},
#line 16 "scripts/genksyms/keywords.gperf"
{"__extension__", EXTENSION_KEYW},
#line 37 "scripts/genksyms/keywords.gperf"
{"enum", ENUM_KEYW},
#line 8 "scripts/genksyms/keywords.gperf"
{"EXPORT_UNUSED_SYMBOL", EXPORT_SYMBOL_KEYW},
#line 38 "scripts/genksyms/keywords.gperf"
{"extern", EXTERN_KEYW},
{""},
#line 19 "scripts/genksyms/keywords.gperf"
{"__signed", SIGNED_KEYW},
#line 9 "scripts/genksyms/keywords.gperf"
{"EXPORT_UNUSED_SYMBOL_GPL", EXPORT_SYMBOL_KEYW},
#line 49 "scripts/genksyms/keywords.gperf"
{"union", UNION_KEYW},
#line 53 "scripts/genksyms/keywords.gperf"
{"typeof", TYPEOF_KEYW},
#line 48 "scripts/genksyms/keywords.gperf"
{"typedef", TYPEDEF_KEYW},
#line 17 "scripts/genksyms/keywords.gperf"
{"__inline", INLINE_KEYW},
#line 33 "scripts/genksyms/keywords.gperf"
{"auto", AUTO_KEYW},
#line 21 "scripts/genksyms/keywords.gperf"
{"__volatile", VOLATILE_KEYW},
{""}, {""},
#line 50 "scripts/genksyms/keywords.gperf"
{"unsigned", UNSIGNED_KEYW},
{""},
#line 44 "scripts/genksyms/keywords.gperf"
{"short", SHORT_KEYW},
#line 40 "scripts/genksyms/keywords.gperf"
{"long", LONG_KEYW}
{"inline", INLINE_KEYW},
{""},
#line 52 "scripts/genksyms/keywords.gperf"
{"volatile", VOLATILE_KEYW},
#line 42 "scripts/genksyms/keywords.gperf"
{"long", LONG_KEYW},
#line 24 "scripts/genksyms/keywords.gperf"
{"_Bool", BOOL_KEYW},
{""}, {""},
#line 43 "scripts/genksyms/keywords.gperf"
{"register", REGISTER_KEYW},
#line 51 "scripts/genksyms/keywords.gperf"
{"void", VOID_KEYW},
#line 39 "scripts/genksyms/keywords.gperf"
{"float", FLOAT_KEYW},
#line 36 "scripts/genksyms/keywords.gperf"
{"double", DOUBLE_KEYW},
{""}, {""}, {""}, {""},
#line 45 "scripts/genksyms/keywords.gperf"
{"signed", SIGNED_KEYW}
};
if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)

2
scripts/genksyms/keywords.gperf
View File

@ -5,6 +5,8 @@ struct resword { const char *name; int token; }
EXPORT_SYMBOL, EXPORT_SYMBOL_KEYW
EXPORT_SYMBOL_GPL, EXPORT_SYMBOL_KEYW
EXPORT_SYMBOL_GPL_FUTURE, EXPORT_SYMBOL_KEYW
EXPORT_UNUSED_SYMBOL, EXPORT_SYMBOL_KEYW
EXPORT_UNUSED_SYMBOL_GPL, EXPORT_SYMBOL_KEYW
__asm, ASM_KEYW
__asm__, ASM_KEYW
__attribute, ATTRIBUTE_KEYW

21
scripts/kallsyms.c
View File

@ -130,18 +130,9 @@ static int read_symbol(FILE *in, struct sym_entry *s)
static int symbol_valid(struct sym_entry *s)
{
/* Symbols which vary between passes. Passes 1 and 2 must have
* identical symbol lists. The kallsyms_* symbols below are only added
* after pass 1, they would be included in pass 2 when --all-symbols is
* specified so exclude them to get a stable symbol list.
* identical symbol lists.
*/
static char *special_symbols[] = {
"kallsyms_addresses",
"kallsyms_num_syms",
"kallsyms_names",
"kallsyms_markers",
"kallsyms_token_table",
"kallsyms_token_index",
/* Exclude linker generated symbols which vary between passes */
"_SDA_BASE_", /* ppc */
"_SDA2_BASE_", /* ppc */
@ -173,7 +164,9 @@ static int symbol_valid(struct sym_entry *s)
}
/* Exclude symbols which vary between passes. */
if (strstr((char *)s->sym + offset, "_compiled."))
if (strstr((char *)s->sym + offset, "_compiled.") ||
strncmp((char*)s->sym + offset, "__compound_literal.", 19) == 0 ||
strncmp((char*)s->sym + offset, "__compound_literal$", 19) == 0)
return 0;
for (i = 0; special_symbols[i]; i++)
@ -550,8 +543,10 @@ int main(int argc, char **argv)
usage();
read_map(stdin);
sort_symbols();
optimize_token_table();
if (table_cnt) {
sort_symbols();
optimize_token_table();
}
write_src();
return 0;