f097e72e63
Added RTIC environmental variable check. If set, this will trigger RTIC MPGen during the kernel build. MPGen generates and embeds the kernel MP.s (measurement parameters) to the vmlinux. It has to be called during the kernel build, before vmlinux is generated. RTIC MP.s to be consumed by the RTIC TA. Change-Id: Id070d0c1960c38d286c31c55d45a6c448348d60d Signed-off-by: Preeti Nagar <pnagar@codeaurora.org>
354 lines
8.9 KiB
Bash
Executable File
354 lines
8.9 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# link vmlinux
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#
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# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
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# $(KBUILD_VMLINUX_MAIN) and $(KBUILD_VMLINUX_LIBS). Most are built-in.a files
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# from top-level directories in the kernel tree, others are specified in
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# arch/$(ARCH)/Makefile. Ordering when linking is important, and
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# $(KBUILD_VMLINUX_INIT) must be first. $(KBUILD_VMLINUX_LIBS) are archives
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# which are linked conditionally (not within --whole-archive), and do not
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# require symbol indexes added.
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#
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# vmlinux
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# ^
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# |
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# +-< $(KBUILD_VMLINUX_INIT)
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# | +--< init/version.o + more
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# |
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# +--< $(KBUILD_VMLINUX_MAIN)
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# | +--< drivers/built-in.a mm/built-in.a + more
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# |
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# +--< $(KBUILD_VMLINUX_LIBS)
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# | +--< lib/lib.a + more
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# |
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# +-< ${kallsymso} (see description in KALLSYMS section)
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#
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# vmlinux version (uname -v) cannot be updated during normal
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# descending-into-subdirs phase since we do not yet know if we need to
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# update vmlinux.
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# Therefore this step is delayed until just before final link of vmlinux.
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#
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# System.map is generated to document addresses of all kernel symbols
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# Error out on error
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set -e
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# Nice output in kbuild format
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# Will be supressed by "make -s"
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info()
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{
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if [ "${quiet}" != "silent_" ]; then
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printf " %-7s %s\n" ${1} ${2}
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fi
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}
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# Thin archive build here makes a final archive with symbol table and indexes
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# from vmlinux objects INIT and MAIN, which can be used as input to linker.
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# KBUILD_VMLINUX_LIBS archives should already have symbol table and indexes
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# added.
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#
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# Traditional incremental style of link does not require this step
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#
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# built-in.a output file
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#
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archive_builtin()
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{
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info AR built-in.a
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rm -f built-in.a;
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${AR} rcsTP${KBUILD_ARFLAGS} built-in.a \
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${KBUILD_VMLINUX_INIT} \
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${KBUILD_VMLINUX_MAIN}
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}
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# Link of vmlinux.o used for section mismatch analysis
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# ${1} output file
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modpost_link()
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{
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local objects
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objects="--whole-archive \
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built-in.a \
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--no-whole-archive \
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--start-group \
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${KBUILD_VMLINUX_LIBS} \
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--end-group"
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${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${objects}
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}
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# Link of vmlinux
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# ${1} - optional extra .o files
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# ${2} - output file
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vmlinux_link()
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{
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local lds="${objtree}/${KBUILD_LDS}"
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local objects
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if [ "${SRCARCH}" != "um" ]; then
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objects="--whole-archive \
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built-in.a \
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--no-whole-archive \
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--start-group \
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${KBUILD_VMLINUX_LIBS} \
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--end-group \
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${1}"
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${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
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-T ${lds} ${objects}
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else
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objects="-Wl,--whole-archive \
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built-in.a \
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-Wl,--no-whole-archive \
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-Wl,--start-group \
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${KBUILD_VMLINUX_LIBS} \
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-Wl,--end-group \
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${1}"
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${CC} ${CFLAGS_vmlinux} -o ${2} \
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-Wl,-T,${lds} \
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${objects} \
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-lutil -lrt -lpthread
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rm -f linux
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fi
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}
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# Create ${2} .o file with all symbols from the ${1} object file
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kallsyms()
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{
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info KSYM ${2}
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local kallsymopt;
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if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
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kallsymopt="${kallsymopt} --all-symbols"
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fi
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if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then
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kallsymopt="${kallsymopt} --absolute-percpu"
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fi
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if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then
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kallsymopt="${kallsymopt} --base-relative"
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fi
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local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
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${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
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local afile="`basename ${2} .o`.S"
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${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
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${CC} ${aflags} -c -o ${2} ${afile}
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}
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# Generates ${2} .o file with RTIC MP's from the ${1} object file (vmlinux)
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# ${3} the file name where the sizes of the RTIC MP structure are stored
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# just in case, save copy of the RTIC mp to ${4}
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# Note: RTIC_MPGEN has to be set if MPGen is available
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rtic_mp()
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{
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# assume that RTIC_MP_O generation may fail
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RTIC_MP_O=
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local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
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${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
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${RTIC_MPGEN} --objcopy="${OBJCOPY}" --objdump="${OBJDUMP}" \
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--binpath='' --vmlinux=${1} --config=${KCONFIG_CONFIG} && \
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cat rtic_mp.c | ${CC} ${aflags} -c -o ${2} -x c - && \
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cp rtic_mp.c ${4} && \
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${NM} --print-size --size-sort ${2} > ${3} && \
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RTIC_MP_O=${2} || echo “RTIC MP generation has failed”
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# NM - save generated variable sizes for verification
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# RTIC_MP_O is our retval - great success if set to generated .o file
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# Echo statement above prints the error message in case any of the
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# above RTIC MP generation commands fail and it ensures rtic mp failure
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# does not cause kernel compilation to fail.
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}
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# Create map file with all symbols from ${1}
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# See mksymap for additional details
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mksysmap()
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{
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${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
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}
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sortextable()
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{
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${objtree}/scripts/sortextable ${1}
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}
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# Delete output files in case of error
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cleanup()
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{
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rm -f .tmp_System.map
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rm -f .tmp_kallsyms*
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rm -f .tmp_vmlinux*
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rm -f built-in.a
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rm -f System.map
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rm -f vmlinux
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rm -f vmlinux.o
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rm -f .tmp_rtic_mp_sz*
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rm -f rtic_mp.*
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}
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on_exit()
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{
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if [ $? -ne 0 ]; then
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cleanup
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fi
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}
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trap on_exit EXIT
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on_signals()
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{
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exit 1
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}
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trap on_signals HUP INT QUIT TERM
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#
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#
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# Use "make V=1" to debug this script
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case "${KBUILD_VERBOSE}" in
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*1*)
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set -x
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;;
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esac
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if [ "$1" = "clean" ]; then
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cleanup
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exit 0
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fi
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# We need access to CONFIG_ symbols
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case "${KCONFIG_CONFIG}" in
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*/*)
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. "${KCONFIG_CONFIG}"
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;;
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*)
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# Force using a file from the current directory
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. "./${KCONFIG_CONFIG}"
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esac
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# Update version
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info GEN .version
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if [ -r .version ]; then
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VERSION=$(expr 0$(cat .version) + 1)
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echo $VERSION > .version
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else
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rm -f .version
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echo 1 > .version
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fi;
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# final build of init/
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${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
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archive_builtin
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#link vmlinux.o
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info LD vmlinux.o
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modpost_link vmlinux.o
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# modpost vmlinux.o to check for section mismatches
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${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
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# Generate RTIC MP placeholder compile unit of the correct size
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# and add it to the list of link objects
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# this needs to be done before generating kallsyms
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if [ ! -z ${RTIC_MPGEN+x} ]; then
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rtic_mp vmlinux.o rtic_mp.o .tmp_rtic_mp_sz1 .tmp_rtic_mp1.c
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KBUILD_VMLINUX_LIBS+=" "
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KBUILD_VMLINUX_LIBS+=$RTIC_MP_O
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fi
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kallsymso=""
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kallsyms_vmlinux=""
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if [ -n "${CONFIG_KALLSYMS}" ]; then
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# kallsyms support
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# Generate section listing all symbols and add it into vmlinux
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# It's a three step process:
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# 1) Link .tmp_vmlinux1 so it has all symbols and sections,
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# but __kallsyms is empty.
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# Running kallsyms on that gives us .tmp_kallsyms1.o with
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# the right size
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# 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
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# the right size, but due to the added section, some
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# addresses have shifted.
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# From here, we generate a correct .tmp_kallsyms2.o
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# 3) That link may have expanded the kernel image enough that
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# more linker branch stubs / trampolines had to be added, which
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# introduces new names, which further expands kallsyms. Do another
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# pass if that is the case. In theory it's possible this results
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# in even more stubs, but unlikely.
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# KALLSYMS_EXTRA_PASS=1 may also used to debug or work around
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# other bugs.
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# 4) The correct ${kallsymso} is linked into the final vmlinux.
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#
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# a) Verify that the System.map from vmlinux matches the map from
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# ${kallsymso}.
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kallsymso=.tmp_kallsyms2.o
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kallsyms_vmlinux=.tmp_vmlinux2
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# step 1
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vmlinux_link "" .tmp_vmlinux1
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kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
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# step 2
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vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
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kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
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# step 3
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size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms1.o)
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size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms2.o)
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if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
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kallsymso=.tmp_kallsyms3.o
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kallsyms_vmlinux=.tmp_vmlinux3
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vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
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kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
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fi
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fi
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# Update RTIC MP object by replacing the place holder
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# with actual MP data of the same size
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# Also double check that object size did not change
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# Note: Check initilally if RTIC_MP_O is not empty or uninitialized,
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# as incase RTIC_MPGEN is set and failure occurs in RTIC_MP_O
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# generation, below check for comparing object sizes fails
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# due to an empty RTIC_MP_O object.
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if [ ! -z ${RTIC_MP_O} ]; then
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rtic_mp "${kallsyms_vmlinux}" rtic_mp.o .tmp_rtic_mp_sz2 \
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.tmp_rtic_mp2.c
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if ! cmp -s .tmp_rtic_mp_sz1 .tmp_rtic_mp_sz2; then
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echo >&2 'ERROR: RTIC MP object files size mismatch'
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exit 1
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fi
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fi
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info LD vmlinux
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vmlinux_link "${kallsymso}" vmlinux
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if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
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info SORTEX vmlinux
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sortextable vmlinux
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fi
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info SYSMAP System.map
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mksysmap vmlinux System.map
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# step a (see comment above)
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if [ -n "${CONFIG_KALLSYMS}" ]; then
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mksysmap ${kallsyms_vmlinux} .tmp_System.map
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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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exit 1
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fi
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fi
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