diff options
Diffstat (limited to 'scripts/link-vmlinux.sh')
| -rwxr-xr-x | scripts/link-vmlinux.sh | 168 |
1 files changed, 17 insertions, 151 deletions
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh index 666f7bbc13ebb..918470d768e9c 100755 --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -3,17 +3,15 @@ # # link vmlinux # -# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_OBJS) and -# $(KBUILD_VMLINUX_LIBS). Most are built-in.a files from top-level directories -# in the kernel tree, others are specified in arch/$(ARCH)/Makefile. +# vmlinux is linked from the objects in vmlinux.a and $(KBUILD_VMLINUX_LIBS). +# vmlinux.a contains objects that are linked unconditionally. # $(KBUILD_VMLINUX_LIBS) are archives which are linked conditionally # (not within --whole-archive), and do not require symbol indexes added. # # vmlinux # ^ # | -# +--< $(KBUILD_VMLINUX_OBJS) -# | +--< init/built-in.a drivers/built-in.a mm/built-in.a + more +# +--< vmlinux.a # | # +--< $(KBUILD_VMLINUX_LIBS) # | +--< lib/lib.a + more @@ -45,112 +43,6 @@ info() printf " %-7s %s\n" "${1}" "${2}" } -# Generate a linker script to ensure correct ordering of initcalls. -gen_initcalls() -{ - info GEN .tmp_initcalls.lds - - ${PYTHON} ${srctree}/scripts/jobserver-exec \ - ${PERL} ${srctree}/scripts/generate_initcall_order.pl \ - ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS} \ - > .tmp_initcalls.lds -} - -# If CONFIG_LTO_CLANG is selected, collect generated symbol versions into -# .tmp_symversions.lds -gen_symversions() -{ - info GEN .tmp_symversions.lds - rm -f .tmp_symversions.lds - - for o in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do - if [ -f ${o}.symversions ]; then - cat ${o}.symversions >> .tmp_symversions.lds - fi - done -} - -# Link of vmlinux.o used for section mismatch analysis -# ${1} output file -modpost_link() -{ - local objects - local lds="" - - objects="--whole-archive \ - ${KBUILD_VMLINUX_OBJS} \ - --no-whole-archive \ - --start-group \ - ${KBUILD_VMLINUX_LIBS} \ - --end-group" - - if is_enabled CONFIG_LTO_CLANG; then - gen_initcalls - lds="-T .tmp_initcalls.lds" - - if is_enabled CONFIG_MODVERSIONS; then - gen_symversions - lds="${lds} -T .tmp_symversions.lds" - fi - - # This might take a while, so indicate that we're doing - # an LTO link - info LTO ${1} - else - info LD ${1} - fi - - ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${lds} ${objects} -} - -objtool_link() -{ - local objtoolcmd; - local objtoolopt; - - if is_enabled CONFIG_LTO_CLANG && is_enabled CONFIG_STACK_VALIDATION; then - # Don't perform vmlinux validation unless explicitly requested, - # but run objtool on vmlinux.o now that we have an object file. - if is_enabled CONFIG_UNWINDER_ORC; then - objtoolcmd="orc generate" - fi - - objtoolopt="${objtoolopt} --duplicate" - - if is_enabled CONFIG_FTRACE_MCOUNT_USE_OBJTOOL; then - objtoolopt="${objtoolopt} --mcount" - fi - fi - - if is_enabled CONFIG_VMLINUX_VALIDATION; then - objtoolopt="${objtoolopt} --noinstr" - fi - - if [ -n "${objtoolopt}" ]; then - if [ -z "${objtoolcmd}" ]; then - objtoolcmd="check" - fi - objtoolopt="${objtoolopt} --vmlinux" - if ! is_enabled CONFIG_FRAME_POINTER; then - objtoolopt="${objtoolopt} --no-fp" - fi - if is_enabled CONFIG_GCOV_KERNEL || is_enabled CONFIG_LTO_CLANG; then - objtoolopt="${objtoolopt} --no-unreachable" - fi - if is_enabled CONFIG_RETPOLINE; then - objtoolopt="${objtoolopt} --retpoline" - fi - if is_enabled CONFIG_X86_SMAP; then - objtoolopt="${objtoolopt} --uaccess" - fi - if is_enabled CONFIG_SLS; then - objtoolopt="${objtoolopt} --sls" - fi - info OBJTOOL ${1} - tools/objtool/objtool ${objtoolcmd} ${objtoolopt} ${1} - fi -} - # Link of vmlinux # ${1} - output file # ${2}, ${3}, ... - optional extra .o files @@ -168,15 +60,21 @@ vmlinux_link() # skip output file argument shift - if is_enabled CONFIG_LTO_CLANG; then + if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; then # Use vmlinux.o instead of performing the slow LTO link again. objs=vmlinux.o libs= else - objs="${KBUILD_VMLINUX_OBJS}" + objs=vmlinux.a libs="${KBUILD_VMLINUX_LIBS}" fi + if is_enabled CONFIG_MODULES; then + objs="${objs} .vmlinux.export.o" + fi + + objs="${objs} init/version-timestamp.o" + if [ "${SRCARCH}" = "um" ]; then wl=-Wl, ld="${CC}" @@ -259,7 +157,7 @@ kallsyms() fi info KSYMS ${2} - ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2} + scripts/kallsyms ${kallsymopt} ${1} > ${2} } # Perform one step in kallsyms generation, including temporary linking of @@ -272,7 +170,8 @@ kallsyms_step() kallsyms_S=${kallsyms_vmlinux}.S vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} - kallsyms ${kallsyms_vmlinux} ${kallsyms_S} + mksysmap ${kallsyms_vmlinux} ${kallsyms_vmlinux}.syms + kallsyms ${kallsyms_vmlinux}.syms ${kallsyms_S} info AS ${kallsyms_S} ${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS} \ @@ -284,6 +183,7 @@ kallsyms_step() # See mksymap for additional details mksysmap() { + info NM ${2} ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} } @@ -296,15 +196,9 @@ sorttable() cleanup() { rm -f .btf.* - rm -f .tmp_System.map - rm -f .tmp_initcalls.lds - rm -f .tmp_symversions.lds - rm -f .tmp_vmlinux* rm -f System.map rm -f vmlinux rm -f vmlinux.map - rm -f vmlinux.o - rm -f .vmlinux.d } # Use "make V=1" to debug this script @@ -319,32 +213,7 @@ if [ "$1" = "clean" ]; then exit 0 fi -# Update version -info GEN .version -if [ -r .version ]; then - VERSION=$(expr 0$(cat .version) + 1) - echo $VERSION > .version -else - rm -f .version - echo 1 > .version -fi; - -# final build of init/ -${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 - -#link vmlinux.o -modpost_link vmlinux.o -objtool_link vmlinux.o - -# modpost vmlinux.o to check for section mismatches -${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1 - -info MODINFO modules.builtin.modinfo -${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo -info GEN modules.builtin -# The second line aids cases where multiple modules share the same object. -tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' | - tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin +${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init init/version-timestamp.o btf_vmlinux_bin_o="" if is_enabled CONFIG_DEBUG_INFO_BTF; then @@ -404,7 +273,6 @@ if is_enabled CONFIG_DEBUG_INFO_BTF && is_enabled CONFIG_BPF; then ${RESOLVE_BTFIDS} vmlinux fi -info SYSMAP System.map mksysmap vmlinux System.map if is_enabled CONFIG_BUILDTIME_TABLE_SORT; then @@ -417,9 +285,7 @@ fi # step a (see comment above) if is_enabled CONFIG_KALLSYMS; then - mksysmap ${kallsyms_vmlinux} .tmp_System.map - - if ! cmp -s System.map .tmp_System.map; then + if ! cmp -s System.map ${kallsyms_vmlinux}.syms; then echo >&2 Inconsistent kallsyms data echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround exit 1 |