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Remove host / target architecture assumption from create-diff-object #1248

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merged 3 commits into from
Feb 4, 2022
Merged

Remove host / target architecture assumption from create-diff-object #1248

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394a907
create-diff-object: move kpatch_find_func_profiling_calls definition
joe-lawrence Jan 21, 2022
4c0e489
create-diff-object: detect architecture from input ELF file
bwendling Jan 21, 2022
f67a008
test/unit: update for cross-arch testing
joe-lawrence Jan 28, 2022
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5 changes: 2 additions & 3 deletions kpatch-build/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -10,19 +10,18 @@ SOURCES = create-diff-object.c kpatch-elf.c \
create-kpatch-module.c \
create-kpatch-module.c lookup.c

ifeq ($(ARCH),x86_64)
SOURCES += insn/insn.c insn/inat.c
INSN = insn/insn.o insn/inat.o
insn/%.o: CFLAGS := $(filter-out -Wconversion, $(CFLAGS))
else ifeq ($(ARCH),ppc64le)
ifeq ($(ARCH),ppc64le)
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It's probably not a big deal, but believe it or not, there are people out there who cross-compile for x86 on a ppc64le host. Does the plugin not compile on x86?

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I haven't looked at the plugin just yet. The scope of this PR was to only incrementally help create-diff-object so that it may read/write cross-arch ELF for the pre-built unit test objects. AFAIK, the plugin only comes into play for the kernel builds, right?

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Ok, makes sense

SOURCES += gcc-plugins/ppc64le-plugin.c
PLUGIN = gcc-plugins/ppc64le-plugin.so
TARGETS += $(PLUGIN)
GCC_PLUGINS_DIR := $(shell gcc -print-file-name=plugin)
PLUGIN_CFLAGS := $(filter-out -Wconversion, $(CFLAGS))
PLUGIN_CFLAGS += -shared -I$(GCC_PLUGINS_DIR)/include \
-Igcc-plugins -fPIC -fno-rtti -O2 -Wall
else
else ifneq ($(ARCH),x86_64)
$(error Unsupported architecture ${ARCH}, check https://github.com/dynup/kpatch/#supported-architectures)
endif

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