| #!/bin/sh |
| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # link vmlinux |
| # |
| # vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and |
| # $(KBUILD_VMLINUX_MAIN) and $(KBUILD_VMLINUX_LIBS). Most are built-in.o files |
| # from top-level directories in the kernel tree, others are specified in |
| # arch/$(ARCH)/Makefile. Ordering when linking is important, and |
| # $(KBUILD_VMLINUX_INIT) must be first. $(KBUILD_VMLINUX_LIBS) are archives |
| # which are linked conditionally (not within --whole-archive), and do not |
| # require symbol indexes added. |
| # |
| # vmlinux |
| # ^ |
| # | |
| # +-< $(KBUILD_VMLINUX_INIT) |
| # | +--< init/version.o + more |
| # | |
| # +--< $(KBUILD_VMLINUX_MAIN) |
| # | +--< drivers/built-in.o mm/built-in.o + more |
| # | |
| # +--< $(KBUILD_VMLINUX_LIBS) |
| # | +--< lib/lib.a + 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} ${2} |
| fi |
| } |
| |
| # Thin archive build here makes a final archive with symbol table and indexes |
| # from vmlinux objects INIT and MAIN, which can be used as input to linker. |
| # KBUILD_VMLINUX_LIBS archives should already have symbol table and indexes |
| # added. |
| # |
| # Traditional incremental style of link does not require this step |
| # |
| # built-in.o output file |
| # |
| archive_builtin() |
| { |
| if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then |
| info AR built-in.o |
| rm -f built-in.o; |
| ${AR} rcsTP${KBUILD_ARFLAGS} built-in.o \ |
| ${KBUILD_VMLINUX_INIT} \ |
| ${KBUILD_VMLINUX_MAIN} |
| fi |
| } |
| |
| # Link of vmlinux.o used for section mismatch analysis |
| # ${1} output file |
| modpost_link() |
| { |
| local objects |
| |
| if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then |
| objects="--whole-archive \ |
| built-in.o \ |
| --no-whole-archive \ |
| --start-group \ |
| ${KBUILD_VMLINUX_LIBS} \ |
| --end-group" |
| else |
| objects="${KBUILD_VMLINUX_INIT} \ |
| --start-group \ |
| ${KBUILD_VMLINUX_MAIN} \ |
| ${KBUILD_VMLINUX_LIBS} \ |
| --end-group" |
| fi |
| ${LD} ${LDFLAGS} -r -o ${1} ${objects} |
| } |
| |
| # Link of vmlinux |
| # ${1} - optional extra .o files |
| # ${2} - output file |
| vmlinux_link() |
| { |
| local lds="${objtree}/${KBUILD_LDS}" |
| local objects |
| |
| if [ "${SRCARCH}" != "um" ]; then |
| if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then |
| objects="--whole-archive \ |
| built-in.o \ |
| --no-whole-archive \ |
| --start-group \ |
| ${KBUILD_VMLINUX_LIBS} \ |
| --end-group \ |
| ${1}" |
| else |
| objects="${KBUILD_VMLINUX_INIT} \ |
| --start-group \ |
| ${KBUILD_VMLINUX_MAIN} \ |
| ${KBUILD_VMLINUX_LIBS} \ |
| --end-group \ |
| ${1}" |
| fi |
| |
| ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \ |
| -T ${lds} ${objects} |
| else |
| if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then |
| objects="-Wl,--whole-archive \ |
| built-in.o \ |
| -Wl,--no-whole-archive \ |
| -Wl,--start-group \ |
| ${KBUILD_VMLINUX_LIBS} \ |
| -Wl,--end-group \ |
| ${1}" |
| else |
| objects="${KBUILD_VMLINUX_INIT} \ |
| -Wl,--start-group \ |
| ${KBUILD_VMLINUX_MAIN} \ |
| ${KBUILD_VMLINUX_LIBS} \ |
| -Wl,--end-group \ |
| ${1}" |
| fi |
| |
| ${CC} ${CFLAGS_vmlinux} -o ${2} \ |
| -Wl,-T,${lds} \ |
| ${objects} \ |
| -lutil -lrt -lpthread |
| 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="${kallsymopt} --all-symbols" |
| fi |
| |
| if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
| kallsymopt="${kallsymopt} --absolute-percpu" |
| fi |
| |
| if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
| kallsymopt="${kallsymopt} --base-relative" |
| fi |
| |
| local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ |
| ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" |
| |
| local afile="`basename ${2} .o`.S" |
| |
| ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile} |
| ${CC} ${aflags} -c -o ${2} ${afile} |
| } |
| |
| # 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 |
| cleanup() |
| { |
| rm -f .tmp_System.map |
| rm -f .tmp_kallsyms* |
| rm -f .tmp_vmlinux* |
| rm -f built-in.o |
| rm -f System.map |
| rm -f vmlinux |
| rm -f vmlinux.o |
| } |
| |
| on_exit() |
| { |
| if [ $? -ne 0 ]; then |
| cleanup |
| fi |
| } |
| trap on_exit EXIT |
| |
| on_signals() |
| { |
| exit 1 |
| } |
| trap on_signals HUP INT QUIT TERM |
| |
| # |
| # |
| # Use "make V=1" to debug this script |
| case "${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 |
| |
| # Update version |
| info GEN .version |
| if [ -r .version ]; then |
| VERSION=$(expr 0$(cat .version) + 1) |
| echo $VERSION > .version |
| else |
| rm -f .version |
| echo 1 > .version |
| fi; |
| |
| # final build of init/ |
| ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}" |
| |
| archive_builtin |
| |
| #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 |
| |
| 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 |
| # 3) That link may have expanded the kernel image enough that |
| # more linker branch stubs / trampolines had to be added, which |
| # introduces new names, which further expands kallsyms. Do another |
| # pass if that is the case. In theory it's possible this results |
| # in even more stubs, but unlikely. |
| # KALLSYMS_EXTRA_PASS=1 may also used to debug or work around |
| # other bugs. |
| # 4) The correct ${kallsymso} is linked into the final vmlinux. |
| # |
| # a) Verify that the System.map from vmlinux matches the map from |
| # ${kallsymso}. |
| |
| kallsymso=.tmp_kallsyms2.o |
| kallsyms_vmlinux=.tmp_vmlinux2 |
| |
| # step 1 |
| vmlinux_link "" .tmp_vmlinux1 |
| kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o |
| |
| # step 2 |
| vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2 |
| kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o |
| |
| # step 3 |
| size1=$(stat -c "%s" .tmp_kallsyms1.o) |
| size2=$(stat -c "%s" .tmp_kallsyms2.o) |
| |
| if [ $size1 -ne $size2 ] || [ -n "${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 |
| exit 1 |
| fi |
| fi |