linux-kernel - [PATCH v2 08/25] powerpc: Add CONFIG_PPC64_ELF_ABI_V1 and CONFIG_PPC64_ELF_ABI

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Message-Id: <1eca1addbc550167da9841c7340a010d0c4b2200.1651905939.git.christophe.leroy@csgroup.eu>
Date:   Sat,  7 May 2022 08:46:10 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        naveen.n.rao@...ux.vnet.ibm.com
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 08/25] powerpc: Add CONFIG_PPC64_ELF_ABI_V1 and CONFIG_PPC64_ELF_ABI_V2

At the time being, we use CONFIG_CPU_LITTLE_ENDIAN and
CONFIG_CPU_BIG_ENDIAN to pass -mabi=elfv1 or elfv2 to
compiler, then define a PPC64_ELF_ABI_v1 or PPC64_ELF_ABI_v2
macro in asm/types.h based on _CALL_ELF define set by the compiler.

Make it more straight forward with a CONFIG option that
is directly usable.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/Makefile                  | 10 +++++-----
 arch/powerpc/boot/Makefile             |  2 ++
 arch/powerpc/platforms/Kconfig.cputype |  6 ++++++
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index eb541e730d3c..1ba98be84101 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -89,10 +89,10 @@ endif
 
 ifdef CONFIG_PPC64
 ifndef CONFIG_CC_IS_CLANG
-cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mabi=elfv1)
-cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mcall-aixdesc)
-aflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mabi=elfv1)
-aflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mabi=elfv2
+cflags-$(CONFIG_PPC64_ELF_ABI_V1)	+= $(call cc-option,-mabi=elfv1)
+cflags-$(CONFIG_PPC64_ELF_ABI_V1)	+= $(call cc-option,-mcall-aixdesc)
+aflags-$(CONFIG_PPC64_ELF_ABI_V1)	+= $(call cc-option,-mabi=elfv1)
+aflags-$(CONFIG_PPC64_ELF_ABI_V2)	+= -mabi=elfv2
 endif
 endif
 
@@ -141,7 +141,7 @@ endif
 
 CFLAGS-$(CONFIG_PPC64)	:= $(call cc-option,-mtraceback=no)
 ifndef CONFIG_CC_IS_CLANG
-ifdef CONFIG_CPU_LITTLE_ENDIAN
+ifdef CONFIG_PPC64_ELF_ABI_V2
 CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
 AFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mabi=elfv2)
 else
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 4b4827c475c6..b6d4fe04c594 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -49,6 +49,8 @@ ifdef CONFIG_CPU_BIG_ENDIAN
 BOOTCFLAGS	+= -mbig-endian
 else
 BOOTCFLAGS	+= -mlittle-endian
+endif
+ifdef CONFIG_PPC64_ELF_ABI_V2
 BOOTCFLAGS	+= $(call cc-option,-mabi=elfv2)
 endif
 
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index e2e1fec91c6e..9bfcf972d21d 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -556,6 +556,12 @@ config CPU_LITTLE_ENDIAN
 
 endchoice
 
+config PPC64_ELF_ABI_V1
+	def_bool PPC64 && CPU_BIG_ENDIAN
+
+config PPC64_ELF_ABI_V2
+	def_bool PPC64 && CPU_LITTLE_ENDIAN
+
 config PPC64_BOOT_WRAPPER
 	def_bool n
 	depends on CPU_LITTLE_ENDIAN
-- 
2.35.1