From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>,
Alan Modra <amodra@gmail.com>,
Segher Boessenkool <segher@kernel.crashing.org>
Subject: [RFC][PATCH] powerpc/64be: use ELFv2 ABI for big endian kernels
Date: Thu, 24 Nov 2016 00:08:40 +1100 [thread overview]
Message-ID: <20161123130840.1877-1-npiggin@gmail.com> (raw)
Question, are there any fundamental reasons we shouldn't use the ELFv2
ABI to build big endian kernels if the compiler supports it?
Thanks,
Nick
---
arch/powerpc/Makefile | 15 +++++----------
arch/powerpc/boot/Makefile | 2 +-
2 files changed, 6 insertions(+), 11 deletions(-)
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 902da6e..b4867fc 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -72,18 +72,19 @@ GNUTARGET := powerpc
MULTIPLEWORD := -mmultiple
endif
+ifeq ($(CONFIG_PPC64),y)
+cflags-y += $(call cc-option,-mabi=elfv2)
+aflags-y += $(call cc-option,-mabi=elfv2)
+endif
+
cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
-cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
-cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mabi=elfv2
ifneq ($(cc-name),clang)
cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
endif
aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
-aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
-aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mabi=elfv2
ifeq ($(HAS_BIARCH),y)
override AS += -a$(BITS)
@@ -113,14 +114,8 @@ endif
endif
CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
-ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2)
-else
-CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
-CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
-AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
-endif
CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 $(MULTIPLEWORD)
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 1d50d41..ef2499b 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -33,7 +33,7 @@ BOOTCFLAGS += -m64
endif
ifdef CONFIG_CPU_BIG_ENDIAN
BOOTCFLAGS += -mbig-endian
-BOOTCFLAGS += $(call cc-option,-mabi=elfv1)
+BOOTCFLAGS += $(call cc-option,-mabi=elfv2)
else
BOOTCFLAGS += -mlittle-endian
BOOTCFLAGS += $(call cc-option,-mabi=elfv2)
--
2.10.2
next reply other threads:[~2016-11-23 13:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-23 13:08 Nicholas Piggin [this message]
2016-11-23 14:20 ` [RFC][PATCH] powerpc/64be: use ELFv2 ABI for big endian kernels Balbir Singh
2016-11-23 14:38 ` Segher Boessenkool
2016-11-24 4:42 ` Nicholas Piggin
2016-11-24 5:37 ` Oliver O'Halloran
2016-11-24 12:27 ` Segher Boessenkool
2016-11-24 22:22 ` Michael Ellerman
2016-11-24 23:17 ` Segher Boessenkool
2016-11-25 1:13 ` Nicholas Piggin
2016-11-25 2:08 ` Michael Ellerman
2016-11-25 2:35 ` Nicholas Piggin
2016-11-25 3:35 ` Michael Ellerman
2016-11-25 2:02 ` Michael Ellerman
2016-11-25 14:59 ` Segher Boessenkool
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