Messages in this thread Patch in this message | | | Date | Wed, 18 Mar 2020 14:18:45 +0100 | From | Peter Zijlstra <> | Subject | [RFC][PATCH v2 20/19] kbuild/objtool: Add objtool-vmlinux.o pass |
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This seems to 'work', must be perfect etc..
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Subject: kbuild/objtool: Add objtool-vmlinux.o pass From: Peter Zijlstra <peterz@infradead.org> Date: Wed Mar 18 13:33:54 CET 2020
Now that objtool is capable of processing vmlinux.o and actually has something useful to do there, (conditionally) add it to the final link pass.
This will increase build time by a few seconds.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- lib/Kconfig.debug | 5 +++++ scripts/link-vmlinux.sh | 24 ++++++++++++++++++++++++ 2 files changed, 29 insertions(+)
--- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -379,6 +379,11 @@ config STACK_VALIDATION For more information, see tools/objtool/Documentation/stack-validation.txt. +config VMLINUX_VALIDATION + bool + depends on STACK_VALIDATION && DEBUG_ENTRY && !PARAVIRT + default y + config DEBUG_FORCE_WEAK_PER_CPU bool "Force weak per-cpu definitions" depends on DEBUG_KERNEL --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -55,6 +55,29 @@ modpost_link() ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${objects} } +objtool_link() +{ + local objtoolopt; + + if [ -n "${CONFIG_VMLINUX_VALIDATION}" ]; then + objtoolopt="check" + if [ -n "${CONFIG_FRAME_POINTER}" ]; then + objtoolopt="${objtoolopt} --no-fp" + fi + if [ -n "${CONFIG_GCOV_KERNEL}" ]; then + objtoolopt="${objtoolopt} --no-unreachable" + fi + if [ -n "${CONFIG_RETPOLINE}" ]; then + objtoolopt="${objtoolopt} --retpoline" + fi + if [ -n "${CONFIG_X86_SMAP}" ]; then + objtoolopt="${objtoolopt} --uaccess" + fi + info OBJTOOL ${1} + tools/objtool/objtool ${objtoolopt} ${1} + fi +} + # Link of vmlinux # ${1} - output file # ${2}, ${3}, ... - optional extra .o files @@ -244,6 +267,7 @@ ${MAKE} -f "${srctree}/scripts/Makefile. #link vmlinux.o info LD vmlinux.o modpost_link vmlinux.o +objtool_link vmlinux.o # modpost vmlinux.o to check for section mismatches ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1
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