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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 8/9] symbols: Generate an xen-sym.map
You could construct _most_ of the names of the functions
by doing 'nm --defined' but unfortunatly you do not get the
<file> prefix that is added on in Xen . For example:
$ cat xen-syms.symbols |grep do_domain_pause
0xffff82d080104920 t domain.c#do_domain_pause
$ nm --defined xen-syms|grep do_domain_pause
ffff82d080104920 t do_domain_pause
This is normally not an issue, but if one is doing livepatching and
wants during build-time verify that the symbols the livepatch payloads
will patch do correspond to the one the hypervisor has built - this helps a lot.
Note that during runtime one can do:
[root@localhost xen]# cat /proc/xen/xensyms |grep do_domain_pause
ffff82d080104920 t domain.c#do_domain_pause
But one may not want to build and verify a livepatch on the same host.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
Cc: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
v1: First submission
v2: Do not use intermediary object file but the final one
v3: Fix comment to have the example from /proc/xen/xensyms. Using '#'
at start of line is a BAD IDEA.
v4: Also do it for EFI builds.
Do not use --warn-dup
---
.gitignore | 1 +
xen/Makefile | 6 +++++-
xen/arch/arm/Makefile | 3 +++
xen/arch/x86/Makefile | 7 ++++++-
xen/tools/symbols.c | 12 +++++++++++-
5 files changed, 26 insertions(+), 3 deletions(-)
diff --git a/.gitignore b/.gitignore
index d193820..44cc7bf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -287,6 +287,7 @@ tools/flask/policy/policy.conf
tools/flask/policy/xenpolicy-*
xen/xen
xen/xen-syms
+xen/xen-syms.map
xen/xen.*
unmodified_drivers/linux-2.6/.tmp_versions
unmodified_drivers/linux-2.6/*.cmd
diff --git a/xen/Makefile b/xen/Makefile
index 76b60bc..294fb9e 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -62,10 +62,12 @@ _install: $(TARGET)$(CONFIG_XEN_INSTALL_SUFFIX)
ln -f -s $(T)-$(XEN_FULLVERSION)$(Z) $(D)$(BOOT_DIR)/$(T)$(Z)
[ -d "$(D)$(DEBUG_DIR)" ] || $(INSTALL_DIR) $(D)$(DEBUG_DIR)
$(INSTALL_DATA) $(TARGET)-syms
$(D)$(DEBUG_DIR)/$(T)-syms-$(XEN_FULLVERSION)
+ $(INSTALL_DATA) $(TARGET)-syms.map
$(D)$(DEBUG_DIR)/$(T)-syms-$(XEN_FULLVERSION).map
$(INSTALL_DATA) $(KCONFIG_CONFIG)
$(D)$(BOOT_DIR)/$(T)-$(XEN_FULLVERSION).config
if [ -r $(TARGET).efi -a -n '$(EFI_DIR)' ]; then \
[ -d $(D)$(EFI_DIR) ] || $(INSTALL_DIR) $(D)$(EFI_DIR); \
$(INSTALL_DATA) $(TARGET).efi
$(D)$(EFI_DIR)/$(T)-$(XEN_FULLVERSION).efi; \
+ $(INSTALL_DATA) $(TARGET)-efi.map
$(D)$(DEBUG_DIR)/$(T)-$(XEN_FULLVERSION).efi.map \
ln -sf $(T)-$(XEN_FULLVERSION).efi
$(D)$(EFI_DIR)/$(T)-$(XEN_VERSION).$(XEN_SUBVERSION).efi; \
ln -sf $(T)-$(XEN_FULLVERSION).efi
$(D)$(EFI_DIR)/$(T)-$(XEN_VERSION).efi; \
ln -sf $(T)-$(XEN_FULLVERSION).efi $(D)$(EFI_DIR)/$(T).efi; \
@@ -91,8 +93,10 @@ _uninstall:
rm -f $(D)$(BOOT_DIR)/$(T)-$(XEN_VERSION)$(Z)
rm -f $(D)$(BOOT_DIR)/$(T)$(Z)
rm -f $(D)$(DEBUG_DIR)/$(T)-syms-$(XEN_FULLVERSION)
+ rm -f $(D)$(DEBUG_DIR)/$(T)-syms-$(XEN_FULLVERSION).map
rm -f $(D)$(EFI_DIR)/$(T)-$(XEN_FULLVERSION).efi
rm -f $(D)$(EFI_DIR)/$(T)-$(XEN_VERSION).$(XEN_SUBVERSION).efi
+ rm -f $(D)$(DEBUG_DIR)/$(T)-$(XEN_FULLVERSION).efi.map
rm -f $(D)$(EFI_DIR)/$(T)-$(XEN_VERSION).efi
rm -f $(D)$(EFI_DIR)/$(T).efi
rm -f
$(D)$(EFI_MOUNTPOINT)/efi/$(EFI_VENDOR)/$(T)-$(XEN_FULLVERSION).efi
@@ -112,7 +116,7 @@ _clean: delete-unfresh-files
$(MAKE) -f $(BASEDIR)/Rules.mk -C arch/$(TARGET_ARCH) clean
$(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig ARCH=$(ARCH)
SRCARCH=$(SRCARCH) clean
find . \( -name "*.o" -o -name ".*.d" \) -exec rm -f {} \;
- rm -f include/asm $(TARGET) $(TARGET).gz $(TARGET).efi $(TARGET)-syms
*~ core
+ rm -f include/asm $(TARGET) $(TARGET).gz $(TARGET).efi
$(TARGET).efi.map $(TARGET)-syms $(TARGET)-syms.map *~ core
rm -f include/asm-*/asm-offsets.h
rm -f .banner
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 23aaf52..0a96713 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -102,6 +102,9 @@ $(TARGET)-syms: prelink.o xen.lds
$(BASEDIR)/common/symbols-dummy.o
$(MAKE) -f $(BASEDIR)/Rules.mk $(@D)/.$(@F).1.o
$(LD) $(LDFLAGS) -T xen.lds -N prelink.o $(build_id_linker) \
$(@D)/.$(@F).1.o -o $@
+ $(NM) -pa --format=sysv $(@D)/$(@F) \
+ | $(BASEDIR)/tools/symbols --xensyms --sysv --sort \
+ >$(@D)/$(@F).map
rm -f $(@D)/.$(@F).[0-9]*
asm-offsets.s: $(TARGET_SUBARCH)/asm-offsets.c
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index 5b9e9da..7209560 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -138,6 +138,9 @@ $(TARGET)-syms: prelink.o xen.lds
$(BASEDIR)/common/symbols-dummy.o
$(MAKE) -f $(BASEDIR)/Rules.mk $(@D)/.$(@F).1.o
$(LD) $(LDFLAGS) -T xen.lds -N prelink.o $(build_id_linker) \
$(@D)/.$(@F).1.o -o $@
+ $(NM) -pa --format=sysv $(@D)/$(@F) \
+ | $(BASEDIR)/tools/symbols --xensyms --sysv --sort \
+ >$(@D)/$(@F).map
rm -f $(@D)/.$(@F).[0-9]*
note.o: $(TARGET)-syms
@@ -182,7 +185,9 @@ $(TARGET).efi: prelink-efi.o efi.lds efi/relocs-dummy.o
$(BASEDIR)/common/symbol
$(guard) $(MAKE) -f $(BASEDIR)/Rules.mk $(@D)/.$(@F).1r.o
$(@D)/.$(@F).1s.o
$(guard) $(LD) $(call EFI_LDFLAGS,$(VIRT_BASE)) -T efi.lds -N $< \
$(@D)/.$(@F).1r.o $(@D)/.$(@F).1s.o $(note_file) -o $@
- if $(guard) false; then rm -f $@; echo 'EFI support disabled'; fi
+ if $(guard) false; then rm -f $@; echo 'EFI support disabled'; \
+ else $(NM) -pa --format=sysv $(@D)/$(@F) \
+ | $(BASEDIR)/tools/symbols --xensyms --sysv --sort
>$(@D)/$(@F).map; fi
rm -f $(@D)/.$(@F).[0-9]*
efi/boot.init.o efi/runtime.o efi/compat.o: $(BASEDIR)/arch/x86/efi/built_in.o
diff --git a/xen/tools/symbols.c b/xen/tools/symbols.c
index 941fbe7..8c5842d 100644
--- a/xen/tools/symbols.c
+++ b/xen/tools/symbols.c
@@ -52,6 +52,7 @@ static unsigned int table_size, table_cnt;
static unsigned long long _stext, _etext, _sinittext, _einittext, _sextratext,
_eextratext;
static int all_symbols = 0;
static int sort_by_name = 0;
+static int map_only = 0;
static char symbol_prefix_char = '\0';
static enum { fmt_bsd, fmt_sysv } input_format;
static int compare_name(const void *p1, const void *p2);
@@ -181,7 +182,7 @@ static int read_symbol(FILE *in, struct sym_entry *s)
*sym++ = '#';
}
strcpy(sym, str);
- if (sort_by_name) {
+ if (sort_by_name || map_only) {
s->orig_symbol = strdup(SYMBOL_NAME(s));
s->type = stype; /* As s->sym[0] ends mangled. */
}
@@ -307,6 +308,13 @@ static void write_src(void)
unsigned int *markers;
char buf[KSYM_NAME_LEN+1];
+ if (map_only) {
+ for (i = 0; i < table_cnt; i++)
+ printf("%#llx %c %s\n", table[i].addr, table[i].type,
+ table[i].orig_symbol);
+
+ return;
+ }
printf("#include <xen/config.h>\n");
printf("#include <asm/types.h>\n");
printf("#if BITS_PER_LONG == 64 && !defined(SYMBOLS_ORIGIN)\n");
@@ -609,6 +617,8 @@ int main(int argc, char **argv)
sort_by_name = 1;
else if (strcmp(argv[i], "--warn-dup") == 0)
warn_dup = true;
+ else if (strcmp(argv[i], "--xensyms") == 0)
+ map_only = true;
else
usage();
}
--
2.4.11
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