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-rwxr-xr-xscripts/link-vmlinux.sh60
1 files changed, 41 insertions, 19 deletions
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 915775eb2921..8c59970a09dc 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -56,13 +56,17 @@ modpost_link()
}
# Link of vmlinux
-# ${1} - optional extra .o files
-# ${2} - output file
+# ${1} - output file
+# ${2}, ${3}, ... - optional extra .o files
vmlinux_link()
{
local lds="${objtree}/${KBUILD_LDS}"
+ local output=${1}
local objects
+ # skip output file argument
+ shift
+
if [ "${SRCARCH}" != "um" ]; then
objects="--whole-archive \
${KBUILD_VMLINUX_OBJS} \
@@ -70,9 +74,10 @@ vmlinux_link()
--start-group \
${KBUILD_VMLINUX_LIBS} \
--end-group \
- ${1}"
+ ${@}"
- ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
+ ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \
+ -o ${output} \
-T ${lds} ${objects}
else
objects="-Wl,--whole-archive \
@@ -81,9 +86,10 @@ vmlinux_link()
-Wl,--start-group \
${KBUILD_VMLINUX_LIBS} \
-Wl,--end-group \
- ${1}"
+ ${@}"
- ${CC} ${CFLAGS_vmlinux} -o ${2} \
+ ${CC} ${CFLAGS_vmlinux} \
+ -o ${output} \
-Wl,-T,${lds} \
${objects} \
-lutil -lrt -lpthread
@@ -92,23 +98,36 @@ vmlinux_link()
}
# generate .BTF typeinfo from DWARF debuginfo
+# ${1} - vmlinux image
+# ${2} - file to dump raw BTF data into
gen_btf()
{
- local pahole_ver;
+ local pahole_ver
+ local bin_arch
if ! [ -x "$(command -v ${PAHOLE})" ]; then
info "BTF" "${1}: pahole (${PAHOLE}) is not available"
- return 0
+ return 1
fi
pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/')
if [ "${pahole_ver}" -lt "113" ]; then
info "BTF" "${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.13"
- return 0
+ return 1
fi
- info "BTF" ${1}
+ info "BTF" ${2}
+ vmlinux_link ${1}
LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1}
+
+ # dump .BTF section into raw binary file to link with final vmlinux
+ bin_arch=$(LANG=C ${OBJDUMP} -f ${1} | grep architecture | \
+ cut -d, -f1 | cut -d' ' -f2)
+ bin_format=$(LANG=C ${OBJDUMP} -f ${1} | grep 'file format' | \
+ awk '{print $4}')
+ ${OBJCOPY} --dump-section .BTF=.btf.vmlinux.bin ${1} 2>/dev/null
+ ${OBJCOPY} -I binary -O ${bin_format} -B ${bin_arch} \
+ --rename-section .data=.BTF .btf.vmlinux.bin ${2}
}
# Create ${2} .o file with all symbols from the ${1} object file
@@ -153,6 +172,7 @@ sortextable()
# Delete output files in case of error
cleanup()
{
+ rm -f .btf.*
rm -f .tmp_System.map
rm -f .tmp_kallsyms*
rm -f .tmp_vmlinux*
@@ -215,6 +235,13 @@ ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1
info MODINFO modules.builtin.modinfo
${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo
+btf_vmlinux_bin_o=""
+if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then
+ if gen_btf .tmp_vmlinux.btf .btf.vmlinux.bin.o ; then
+ btf_vmlinux_bin_o=.btf.vmlinux.bin.o
+ fi
+fi
+
kallsymso=""
kallsyms_vmlinux=""
if [ -n "${CONFIG_KALLSYMS}" ]; then
@@ -246,11 +273,11 @@ if [ -n "${CONFIG_KALLSYMS}" ]; then
kallsyms_vmlinux=.tmp_vmlinux2
# step 1
- vmlinux_link "" .tmp_vmlinux1
+ vmlinux_link .tmp_vmlinux1 ${btf_vmlinux_bin_o}
kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
# step 2
- vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
+ vmlinux_link .tmp_vmlinux2 .tmp_kallsyms1.o ${btf_vmlinux_bin_o}
kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
# step 3
@@ -261,18 +288,13 @@ if [ -n "${CONFIG_KALLSYMS}" ]; then
kallsymso=.tmp_kallsyms3.o
kallsyms_vmlinux=.tmp_vmlinux3
- vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
-
+ vmlinux_link .tmp_vmlinux3 .tmp_kallsyms2.o ${btf_vmlinux_bin_o}
kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
fi
fi
info LD vmlinux
-vmlinux_link "${kallsymso}" vmlinux
-
-if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then
- gen_btf vmlinux
-fi
+vmlinux_link vmlinux "${kallsymso}" "${btf_vmlinux_bin_o}"
if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
info SORTEX vmlinux