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| author | Tony Breeds <tony@bakeyournoodle.com> | 2009-09-14 19:57:02 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-09-24 15:31:40 +1000 |
| commit | 144ef909c09b60c97b3c20b69ea30abd1e60e54d (patch) | |
| tree | bfade6f9d26ea4fddaf72e7c7f10102758fcacb6 /arch/powerpc/Makefile | |
| parent | ad08587e5df17e192a57437bfedaba125998de25 (diff) | |
| download | lwn-144ef909c09b60c97b3c20b69ea30abd1e60e54d.tar.gz lwn-144ef909c09b60c97b3c20b69ea30abd1e60e54d.zip | |
powerpc: Check for unsupported relocs when using CONFIG_RELOCATABLE
When using CONFIG_RELOCATABLE, we build the kernel as a position
independent executable. The kernel then uses a little bit of relocation
code to relocate itself. That code only deals with R_PPC64_RELATIVE
relocations though. If for some reason you use assembly constructs
such as LOAD_REG_IMMEDIATE() to load the address of a symbol, you'll
generate different kinds of relocations that won't be processed properly
and bad things will happen. (We have 2 such bugs today).
The perl script tries to filter out "known" bad ones. It's possible
that we are missing some in the case of a weak function that nobody
implements, we'll see if we get false positive and fix it.
Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/Makefile')
| -rw-r--r-- | arch/powerpc/Makefile | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index aacf629c1a9f..1a54a3b3a3fa 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -164,6 +164,17 @@ PHONY += $(BOOT_TARGETS) boot := arch/$(ARCH)/boot +ifeq ($(CONFIG_RELOCATABLE),y) +quiet_cmd_relocs_check = CALL $< + cmd_relocs_check = perl $< "$(OBJDUMP)" "$(obj)/vmlinux" + +PHONY += relocs_check +relocs_check: arch/powerpc/relocs_check.pl vmlinux + $(call cmd,relocs_check) + +zImage: relocs_check +endif + $(BOOT_TARGETS): vmlinux $(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@) |