kbuild: add ability to generate BTF type info for vmlinux

[thirdparty/kernel/linux.git] / scripts / link-vmlinux.sh

diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index dc0e8c5a140239c6a3bb13ccfbca5ab522328a28..dd2b31ccca6a40f5c8a8d10bba81d76ea1425d15 100755 (executable)
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -35,7 +35,7 @@ set -e
 info()
 {
        if [ "${quiet}" != "silent_" ]; then
-               printf "  %-7s %s\n" ${1} ${2}
+               printf "  %-7s %s\n" "${1}" "${2}"
        fi
 }
 
@@ -91,6 +91,20 @@ vmlinux_link()
        fi
 }
 
+# generate .BTF typeinfo from DWARF debuginfo
+gen_btf()
+{
+       local pahole_ver;
+
+       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"
+               exit 0
+       fi
+
+       info "BTF" ${1}
+       LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1}
+}
 
 # Create ${2} .o file with all symbols from the ${1} object file
 kallsyms()
@@ -248,6 +262,10 @@ fi
 info LD vmlinux
 vmlinux_link "${kallsymso}" vmlinux
 
+if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then
+       gen_btf vmlinux
+fi
+
 if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
        info SORTEX vmlinux
        sortextable vmlinux