btf: rename /sys/kernel/btf/kernel into /sys/kernel/btf/vmlinux

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

diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index dc0e8c5a140239c6a3bb13ccfbca5ab522328a28..f7933c606f27b965540dd891193311a146f402aa 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
 }
 
@@ -56,8 +56,8 @@ modpost_link()
 }
 
 # Link of vmlinux
-# ${1} - optional extra .o files
-# ${2} - output file
+# ${1} - output file
+# ${@:2} - optional extra .o files
 vmlinux_link()
 {
        local lds="${objtree}/${KBUILD_LDS}"
@@ -70,9 +70,9 @@ vmlinux_link()
                        --start-group                           \
                        ${KBUILD_VMLINUX_LIBS}                  \
                        --end-group                             \
-                       ${1}"
+                       ${@:2}"
 
-               ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} -o ${2}      \
+               ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} -o ${1}      \
                        -T ${lds} ${objects}
        else
                objects="-Wl,--whole-archive                    \
@@ -81,9 +81,9 @@ vmlinux_link()
                        -Wl,--start-group                       \
                        ${KBUILD_VMLINUX_LIBS}                  \
                        -Wl,--end-group                         \
-                       ${1}"
+                       ${@:2}"
 
-               ${CC} ${CFLAGS_vmlinux} -o ${2}                 \
+               ${CC} ${CFLAGS_vmlinux} -o ${1}                 \
                        -Wl,-T,${lds}                           \
                        ${objects}                              \
                        -lutil -lrt -lpthread
@@ -91,6 +91,36 @@ vmlinux_link()
        fi
 }
 
+# generate .BTF typeinfo from DWARF debuginfo
+# ${1} - vmlinux image
+# ${2} - file to dump raw BTF data into
+gen_btf()
+{
+       local pahole_ver
+       local bin_arch
+
+       if ! [ -x "$(command -v ${PAHOLE})" ]; then
+               info "BTF" "${1}: pahole (${PAHOLE}) is not available"
+               return 1
+       fi
+
+       pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/')
+       if [ "${pahole_ver}" -lt "113" ]; then
+               info "BTF" "${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.13"
+               return 1
+       fi
+
+       info "BTF" ${2}
+       vmlinux_link ${1}
+       LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1}
+
+       # dump .BTF section into raw binary file to link with final vmlinux
+       bin_arch=$(${OBJDUMP} -f ${1} | grep architecture | \
+               cut -d, -f1 | cut -d' ' -f2)
+       ${OBJCOPY} --dump-section .BTF=.btf.vmlinux.bin ${1} 2>/dev/null
+       ${OBJCOPY} -I binary -O ${CONFIG_OUTPUT_FORMAT} -B ${bin_arch} \
+               --rename-section .data=.BTF .btf.vmlinux.bin ${2}
+}
 
 # Create ${2} .o file with all symbols from the ${1} object file
 kallsyms()
@@ -134,6 +164,7 @@ 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*
@@ -193,6 +224,16 @@ modpost_link vmlinux.o
 # modpost vmlinux.o to check for section mismatches
 ${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
 
+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 "${CONFIG_KALLSYMS}" ]; then
@@ -224,11 +265,11 @@ if [ -n "${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
@@ -239,14 +280,13 @@ 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 "${kallsymso}" vmlinux
+vmlinux_link vmlinux "${kallsymso}" "${btf_vmlinux_bin_o}"
 
 if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
        info SORTEX vmlinux