diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2014-05-15 09:33:42 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2014-07-11 13:33:42 +0100 |
| commit | 1e2f98c52b3b79761f9969ae6aef9c079192448b (patch) | |
| tree | d7192794d16bb67e16fd54a5971decc75fa0a38d | |
| parent | 895902a9f59aea579a3e9333c48fc45dedc4daee (diff) | |
powerpc: Fix 64 bit builds with binutils 2.24
commit 7998eb3dc700aaf499f93f50b3d77da834ef9e1d upstream.
With binutils 2.24, various 64 bit builds fail with relocation errors
such as
arch/powerpc/kernel/built-in.o: In function `exc_debug_crit_book3e':
(.text+0x165ee): relocation truncated to fit: R_PPC64_ADDR16_HI
against symbol `interrupt_base_book3e' defined in .text section
in arch/powerpc/kernel/built-in.o
arch/powerpc/kernel/built-in.o: In function `exc_debug_crit_book3e':
(.text+0x16602): relocation truncated to fit: R_PPC64_ADDR16_HI
against symbol `interrupt_end_book3e' defined in .text section
in arch/powerpc/kernel/built-in.o
The assembler maintainer says:
I changed the ABI, something that had to be done but unfortunately
happens to break the booke kernel code. When building up a 64-bit
value with lis, ori, shl, oris, ori or similar sequences, you now
should use @high and @higha in place of @h and @ha. @h and @ha
(and their associated relocs R_PPC64_ADDR16_HI and R_PPC64_ADDR16_HA)
now report overflow if the value is out of 32-bit signed range.
ie. @h and @ha assume you're building a 32-bit value. This is needed
to report out-of-range -mcmodel=medium toc pointer offsets in @toc@h
and @toc@ha expressions, and for consistency I did the same for all
other @h and @ha relocs.
Replacing @h with @high in one strategic location fixes the relocation
errors. This has to be done conditionally since the assembler either
supports @h or @high but not both.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | arch/powerpc/Makefile | 4 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/ppc_asm.h | 7 |
2 files changed, 9 insertions, 2 deletions
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 70ba0c0a1223..9a980b3343d5 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -69,7 +69,9 @@ LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-yy) CFLAGS-$(CONFIG_PPC64) := -mminimal-toc -mtraceback=no -mcall-aixdesc CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 -mmultiple -KBUILD_CPPFLAGS += -Iarch/$(ARCH) +asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1) + +KBUILD_CPPFLAGS += -Iarch/$(ARCH) $(asinstr) KBUILD_AFLAGS += -Iarch/$(ARCH) KBUILD_CFLAGS += -msoft-float -pipe -Iarch/$(ARCH) $(CFLAGS-y) CPP = $(CC) -E $(KBUILD_CFLAGS) diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h index 368f72f79808..0f3a740b7cd8 100644 --- a/arch/powerpc/include/asm/ppc_asm.h +++ b/arch/powerpc/include/asm/ppc_asm.h @@ -292,11 +292,16 @@ n: * ld rY,ADDROFF(name)(rX) */ #ifdef __powerpc64__ +#ifdef HAVE_AS_ATHIGH +#define __AS_ATHIGH high +#else +#define __AS_ATHIGH h +#endif #define LOAD_REG_IMMEDIATE(reg,expr) \ lis (reg),(expr)@highest; \ ori (reg),(reg),(expr)@higher; \ rldicr (reg),(reg),32,31; \ - oris (reg),(reg),(expr)@h; \ + oris reg,reg,(expr)@__AS_ATHIGH; \ ori (reg),(reg),(expr)@l; #define LOAD_REG_ADDR(reg,name) \ |