1 files changed, 211 insertions, 0 deletions

diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
new file mode 100644
index 000000000000..26c5b658c2d5
--- /dev/null
+++ b/scripts/link-vmlinux.sh
@@ -0,0 +1,211 @@
+#!/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\n" ${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 ${2}
+        local kallsymopt;
+
+        if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
+                kallsymopt=--all-symbols
+        fi
+
+        local aflags="${KBUILD_AFLAGS} ${NOSTDINC_FLAGS}                     \
+                      ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
+
+        ${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} ${2}
+}
+
+# Delete output files in case of error
+trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR
+cleanup()
+{
+        rm -f .old_version
+        rm -f .tmp_System.map
+        rm -f .tmp_kallsyms*
+        rm -f .tmp_version
+        rm -f .tmp_vmlinux*
+        rm -f System.map
+        rm -f vmlinux
+        rm -f vmlinux.o
+}
+
+#
+#
+# Use "make V=1" to debug this script
+case "${KBUILD_VERBOSE}" in
+*1*)
+        set -x
+        ;;
+esac
+
+if [ "$1" = "clean" ]; then
+        cleanup
+        exit 0
+fi
+
+# We need access to CONFIG_ symbols
+. ./.config
+
+#link vmlinux.o
+info LD vmlinux.o
+modpost_link vmlinux.o
+
+# modpost vmlinux.o to check for section mismatches
+${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 "${kallsymso}" vmlinux
+
+info SYSMAP System.map
+mksysmap vmlinux System.map
+
+# step a (see comment above)
+if [ -n "${CONFIG_KALLSYMS}" ]; then
+        mksysmap ${kallsyms_vmlinux} .tmp_System.map
+
+        if ! cmp -s System.map .tmp_System.map; then
+                echo Inconsistent kallsyms data
+                echo echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
+                cleanup
+                exit 1
+        fi
+fi
+
+# We made a new kernel - delete old version file
+rm -f .old_version