mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
![Ming Lei](/assets/img/avatar_default.png)
This patch uses CONFIG_PAGE_OFFSET to filter symbols which
are not in kernel address space because these symbols are
generally for generating code purpose and can't be run at
kernel mode, so we needn't keep them in /proc/kallsyms.
For example, on ARM there are some symbols which may be
linked in relocatable code section, then perf can't parse
symbols any more from /proc/kallsyms, this patch fixes the
problem (introduced b9b32bf70f
)
Cc: Russell King <linux@arm.linux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@vger.kernel.org
234 lines
5.6 KiB
Bash
234 lines
5.6 KiB
Bash
#!/bin/sh
|
|
#
|
|
# link vmlinux
|
|
#
|
|
# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
|
|
# $(KBUILD_VMLINUX_MAIN). Most are built-in.o files from top-level directories
|
|
# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
|
|
# Ordering when linking is important, and $(KBUILD_VMLINUX_INIT) must be first.
|
|
#
|
|
# vmlinux
|
|
# ^
|
|
# |
|
|
# +-< $(KBUILD_VMLINUX_INIT)
|
|
# | +--< init/version.o + more
|
|
# |
|
|
# +--< $(KBUILD_VMLINUX_MAIN)
|
|
# | +--< drivers/built-in.o mm/built-in.o + more
|
|
# |
|
|
# +-< ${kallsymso} (see description in KALLSYMS section)
|
|
#
|
|
# vmlinux version (uname -v) cannot be updated during normal
|
|
# descending-into-subdirs phase since we do not yet know if we need to
|
|
# update vmlinux.
|
|
# Therefore this step is delayed until just before final link of vmlinux.
|
|
#
|
|
# System.map is generated to document addresses of all kernel symbols
|
|
|
|
# Error out on error
|
|
set -e
|
|
|
|
# Nice output in kbuild format
|
|
# Will be supressed by "make -s"
|
|
info()
|
|
{
|
|
if [ "${quiet}" != "silent_" ]; then
|
|
printf " %-7s %s\n" ${1} ${2}
|
|
fi
|
|
}
|
|
|
|
# Link of vmlinux.o used for section mismatch analysis
|
|
# ${1} output file
|
|
modpost_link()
|
|
{
|
|
${LD} ${LDFLAGS} -r -o ${1} ${KBUILD_VMLINUX_INIT} \
|
|
--start-group ${KBUILD_VMLINUX_MAIN} --end-group
|
|
}
|
|
|
|
# Link of vmlinux
|
|
# ${1} - optional extra .o files
|
|
# ${2} - output file
|
|
vmlinux_link()
|
|
{
|
|
local lds="${objtree}/${KBUILD_LDS}"
|
|
|
|
if [ "${SRCARCH}" != "um" ]; then
|
|
${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
|
|
-T ${lds} ${KBUILD_VMLINUX_INIT} \
|
|
--start-group ${KBUILD_VMLINUX_MAIN} --end-group ${1}
|
|
else
|
|
${CC} ${CFLAGS_vmlinux} -o ${2} \
|
|
-Wl,-T,${lds} ${KBUILD_VMLINUX_INIT} \
|
|
-Wl,--start-group \
|
|
${KBUILD_VMLINUX_MAIN} \
|
|
-Wl,--end-group \
|
|
-lutil ${1}
|
|
rm -f linux
|
|
fi
|
|
}
|
|
|
|
|
|
# Create ${2} .o file with all symbols from the ${1} object file
|
|
kallsyms()
|
|
{
|
|
info KSYM ${2}
|
|
local kallsymopt;
|
|
|
|
if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then
|
|
kallsymopt="${kallsymopt} --symbol-prefix=_"
|
|
fi
|
|
|
|
if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
|
|
kallsymopt="${kallsymopt} --all-symbols"
|
|
fi
|
|
|
|
kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET"
|
|
|
|
local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
|
|
${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
|
|
|
|
${NM} -n ${1} | \
|
|
scripts/kallsyms ${kallsymopt} | \
|
|
${CC} ${aflags} -c -o ${2} -x assembler-with-cpp -
|
|
}
|
|
|
|
# Create map file with all symbols from ${1}
|
|
# See mksymap for additional details
|
|
mksysmap()
|
|
{
|
|
${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
|
|
}
|
|
|
|
sortextable()
|
|
{
|
|
${objtree}/scripts/sortextable ${1}
|
|
}
|
|
|
|
# Delete output files in case of error
|
|
trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR
|
|
cleanup()
|
|
{
|
|
rm -f .old_version
|
|
rm -f .tmp_System.map
|
|
rm -f .tmp_kallsyms*
|
|
rm -f .tmp_version
|
|
rm -f .tmp_vmlinux*
|
|
rm -f System.map
|
|
rm -f vmlinux
|
|
rm -f vmlinux.o
|
|
}
|
|
|
|
#
|
|
#
|
|
# Use "make V=1" to debug this script
|
|
case "${KBUILD_VERBOSE}" in
|
|
*1*)
|
|
set -x
|
|
;;
|
|
esac
|
|
|
|
if [ "$1" = "clean" ]; then
|
|
cleanup
|
|
exit 0
|
|
fi
|
|
|
|
# We need access to CONFIG_ symbols
|
|
case "${KCONFIG_CONFIG}" in
|
|
*/*)
|
|
. "${KCONFIG_CONFIG}"
|
|
;;
|
|
*)
|
|
# Force using a file from the current directory
|
|
. "./${KCONFIG_CONFIG}"
|
|
esac
|
|
|
|
#link vmlinux.o
|
|
info LD vmlinux.o
|
|
modpost_link vmlinux.o
|
|
|
|
# modpost vmlinux.o to check for section mismatches
|
|
${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
|
|
|
|
# Update version
|
|
info GEN .version
|
|
if [ ! -r .version ]; then
|
|
rm -f .version;
|
|
echo 1 >.version;
|
|
else
|
|
mv .version .old_version;
|
|
expr 0$(cat .old_version) + 1 >.version;
|
|
fi;
|
|
|
|
# final build of init/
|
|
${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
|
|
|
|
kallsymso=""
|
|
kallsyms_vmlinux=""
|
|
if [ -n "${CONFIG_KALLSYMS}" ]; then
|
|
|
|
# kallsyms support
|
|
# Generate section listing all symbols and add it into vmlinux
|
|
# It's a three step process:
|
|
# 1) Link .tmp_vmlinux1 so it has all symbols and sections,
|
|
# but __kallsyms is empty.
|
|
# Running kallsyms on that gives us .tmp_kallsyms1.o with
|
|
# the right size
|
|
# 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
|
|
# the right size, but due to the added section, some
|
|
# addresses have shifted.
|
|
# From here, we generate a correct .tmp_kallsyms2.o
|
|
# 2a) We may use an extra pass as this has been necessary to
|
|
# woraround some alignment related bugs.
|
|
# KALLSYMS_EXTRA_PASS=1 is used to trigger this.
|
|
# 3) The correct ${kallsymso} is linked into the final vmlinux.
|
|
#
|
|
# a) Verify that the System.map from vmlinux matches the map from
|
|
# ${kallsymso}.
|
|
|
|
kallsymso=.tmp_kallsyms2.o
|
|
kallsyms_vmlinux=.tmp_vmlinux2
|
|
|
|
# step 1
|
|
vmlinux_link "" .tmp_vmlinux1
|
|
kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
|
|
|
|
# step 2
|
|
vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
|
|
kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
|
|
|
|
# step 2a
|
|
if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
|
|
kallsymso=.tmp_kallsyms3.o
|
|
kallsyms_vmlinux=.tmp_vmlinux3
|
|
|
|
vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
|
|
|
|
kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
|
|
fi
|
|
fi
|
|
|
|
info LD vmlinux
|
|
vmlinux_link "${kallsymso}" vmlinux
|
|
|
|
if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
|
|
info SORTEX vmlinux
|
|
sortextable vmlinux
|
|
fi
|
|
|
|
info SYSMAP System.map
|
|
mksysmap vmlinux System.map
|
|
|
|
# step a (see comment above)
|
|
if [ -n "${CONFIG_KALLSYMS}" ]; then
|
|
mksysmap ${kallsyms_vmlinux} .tmp_System.map
|
|
|
|
if ! cmp -s System.map .tmp_System.map; then
|
|
echo >&2 Inconsistent kallsyms data
|
|
echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
|
|
cleanup
|
|
exit 1
|
|
fi
|
|
fi
|
|
|
|
# We made a new kernel - delete old version file
|
|
rm -f .old_version
|