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scripts/link-vmlinux.sh
5.72 KB
1f2bfbd00 kbuild: link of v... |
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#!/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 " ${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 ${2} local kallsymopt; |
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if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then kallsymopt="${kallsymopt} --symbol-prefix=_" |
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fi |
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if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then |
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kallsymopt="${kallsymopt} --all-symbols" |
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fi |
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if [ -n "${CONFIG_ARM}" ] && [ -n "${CONFIG_PAGE_OFFSET}" ]; then kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET" fi |
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if [ -n "${CONFIG_X86_64}" ]; then kallsymopt="${kallsymopt} --absolute-percpu" fi |
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local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" |
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${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} } |
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sortextable() { ${objtree}/scripts/sortextable ${1} } |
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# Delete output files in case of error trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR cleanup() { rm -f .old_version rm -f .tmp_System.map rm -f .tmp_kallsyms* rm -f .tmp_version rm -f .tmp_vmlinux* rm -f System.map rm -f vmlinux rm -f vmlinux.o } # # # Use "make V=1" to debug this script case "${KBUILD_VERBOSE}" in *1*) set -x ;; esac if [ "$1" = "clean" ]; then cleanup exit 0 fi # We need access to CONFIG_ symbols |
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case "${KCONFIG_CONFIG}" in */*) . "${KCONFIG_CONFIG}" ;; *) # Force using a file from the current directory . "./${KCONFIG_CONFIG}" esac |
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#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 "${kallsymso}" vmlinux |
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if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then info SORTEX vmlinux sortextable vmlinux fi |
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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 |
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echo >&2 Inconsistent kallsyms data |
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echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
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cleanup exit 1 fi fi # We made a new kernel - delete old version file rm -f .old_version |