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kbuild/objtool: Add objtool-vmlinux.o pass

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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>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20200416115119.287494491@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2020-03-18 13:33:54 +01:00 committed by Ingo Molnar
parent 87ecb582f0
commit 6804c1afd7
2 changed files with 29 additions and 0 deletions
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5
lib/Kconfig.debug
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@ -369,6 +369,11 @@ 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

24
scripts/link-vmlinux.sh
View File

@ -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 [ -z "${CONFIG_FRAME_POINTER}" ]; then
objtoolopt="${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
@ -251,6 +274,7 @@ ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1
#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