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kselftest/arm64: build BTI tests in output directory

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The arm64 BTI selftests are currently built in the source directory,
then the generated binaries are copied to the output directory.
This leaves the object files around in a potentially otherwise pristine
source tree, tainting it for out-of-tree kernel builds.

Prepend $(OUTPUT) to every reference to an object file in the Makefile,
and remove the extra handling and copying. This puts all generated files
under the output directory.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230815145931.2522557-1-andre.przywara@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Andre Przywara 2023-08-15 15:59:31 +01:00 committed by Will Deacon
parent 46862da15e
commit e08302ee46
2 changed files with 20 additions and 27 deletions
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45
tools/testing/selftests/arm64/bti/Makefile
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@ -2,8 +2,6 @@
TEST_GEN_PROGS := btitest nobtitest
PROGS := $(patsubst %,gen/%,$(TEST_GEN_PROGS))
# These tests are built as freestanding binaries since otherwise BTI
# support in ld.so is required which is not currently widespread; when
# it is available it will still be useful to test this separately as the
@ -18,44 +16,41 @@ CFLAGS_COMMON = -ffreestanding -Wall -Wextra $(CFLAGS)
BTI_CC_COMMAND = $(CC) $(CFLAGS_BTI) $(CFLAGS_COMMON) -c -o $@ $<
NOBTI_CC_COMMAND = $(CC) $(CFLAGS_NOBTI) $(CFLAGS_COMMON) -c -o $@ $<
%-bti.o: %.c
$(OUTPUT)/%-bti.o: %.c
$(BTI_CC_COMMAND)
%-bti.o: %.S
$(OUTPUT)/%-bti.o: %.S
$(BTI_CC_COMMAND)
%-nobti.o: %.c
$(OUTPUT)/%-nobti.o: %.c
$(NOBTI_CC_COMMAND)
%-nobti.o: %.S
$(OUTPUT)/%-nobti.o: %.S
$(NOBTI_CC_COMMAND)
BTI_OBJS = \
test-bti.o \
signal-bti.o \
start-bti.o \
syscall-bti.o \
system-bti.o \
teststubs-bti.o \
trampoline-bti.o
gen/btitest: $(BTI_OBJS)
$(OUTPUT)/test-bti.o \
$(OUTPUT)/signal-bti.o \
$(OUTPUT)/start-bti.o \
$(OUTPUT)/syscall-bti.o \
$(OUTPUT)/system-bti.o \
$(OUTPUT)/teststubs-bti.o \
$(OUTPUT)/trampoline-bti.o
$(OUTPUT)/btitest: $(BTI_OBJS)
$(CC) $(CFLAGS_BTI) $(CFLAGS_COMMON) -nostdlib -static -o $@ $^
NOBTI_OBJS = \
test-nobti.o \
signal-nobti.o \
start-nobti.o \
syscall-nobti.o \
system-nobti.o \
teststubs-nobti.o \
trampoline-nobti.o
gen/nobtitest: $(NOBTI_OBJS)
$(OUTPUT)/test-nobti.o \
$(OUTPUT)/signal-nobti.o \
$(OUTPUT)/start-nobti.o \
$(OUTPUT)/syscall-nobti.o \
$(OUTPUT)/system-nobti.o \
$(OUTPUT)/teststubs-nobti.o \
$(OUTPUT)/trampoline-nobti.o
$(OUTPUT)/nobtitest: $(NOBTI_OBJS)
$(CC) $(CFLAGS_BTI) $(CFLAGS_COMMON) -nostdlib -static -o $@ $^
# Including KSFT lib.mk here will also mangle the TEST_GEN_PROGS list
# to account for any OUTPUT target-dirs optionally provided by
# the toplevel makefile
include ../../lib.mk
$(TEST_GEN_PROGS): $(PROGS)
cp $(PROGS) $(OUTPUT)/

2
tools/testing/selftests/arm64/bti/gen/.gitignore vendored
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@ -1,2 +0,0 @@
btitest
nobtitest