arch: add BR2_READELF_ARCH_NAME hidden config option

This config option corresponds to the string returned by readelf for
the "Machine" field of the ELF header. It will be used to check if the
architecture of binaries built by Buildroot match the target
architecture.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

arch/Config.in

@@ -292,6 +292,12 @@ config BR2_GCC_TARGET_MODE
 config BR2_BINFMT_SUPPORTS_SHARED
 	bool
 
+# Must match the name of the architecture from readelf point of view,
+# i.e the "Machine:" field of readelf output. See get_machine_name()
+# in binutils/readelf.c for the list of possible values.
+config BR2_READELF_ARCH_NAME
+	string
+
 # Set up target binary format
 choice
 	prompt "Target Binary Format"

arch/Config.in.arc

@@ -38,6 +38,9 @@ config BR2_GCC_TARGET_CPU
 	default "arc700" if BR2_arc770d
 	default "archs"	 if BR2_archs38
 
+config BR2_READELF_ARCH_NAME
+	default "ARCv2"
+
 choice
 	prompt "MMU Page Size"
 	default BR2_ARC_PAGE_SIZE_8K

arch/Config.in.arm

@@ -568,3 +568,7 @@ config BR2_GCC_TARGET_FLOAT_ABI
 config BR2_GCC_TARGET_MODE
 	default "arm"		if BR2_ARM_INSTRUCTIONS_ARM
 	default "thumb"		if BR2_ARM_INSTRUCTIONS_THUMB || BR2_ARM_INSTRUCTIONS_THUMB2
+
+config BR2_READELF_ARCH_NAME
+	default "ARM"		if BR2_arm || BR2_armeb
+	default "AArch64"	if BR2_aarch64 || BR2_aarch64_be

arch/Config.in.bfin

@@ -105,3 +105,6 @@ config BR2_GCC_TARGET_CPU_REVISION
 	  value of the -mcpu option. For example, if the selected CPU is
 	  bf609, and then selected CPU revision is "0.0", then gcc will
 	  receive the -mcpu=bf609-0.0 option.
+
+config BR2_READELF_ARCH_NAME
+	default "Analog Devices Blackfin"

arch/Config.in.csky

@@ -44,3 +44,5 @@ config BR2_GCC_TARGET_CPU
 	default "ck810f"	if (BR2_ck810 &&  BR2_CSKY_FPU && !BR2_CSKY_DSP)
 	default "ck810ef"	if (BR2_ck810 &&  BR2_CSKY_FPU &&  BR2_CSKY_DSP)
 
+config BR2_READELF_ARCH_NAME
+	default "CSKY"

arch/Config.in.m68k

@@ -35,3 +35,6 @@ endchoice
 config BR2_GCC_TARGET_CPU
 	default "68040"		if BR2_m68k_68040
 	default "5208"		if BR2_m68k_cf5208
+
+config BR2_READELF_ARCH_NAME
+	default "MC68000"

arch/Config.in.microblaze

@@ -6,6 +6,9 @@ config BR2_ENDIAN
 	default "LITTLE" if BR2_microblazeel
 	default "BIG"	 if BR2_microblazebe
 
+config BR2_READELF_ARCH_NAME
+	default "Xilinx MicroBlaze"
+
 config BR2_microblaze
 	bool
 	default y if BR2_microblazeel || BR2_microblazebe

arch/Config.in.mips

@@ -161,3 +161,6 @@ config BR2_GCC_TARGET_ABI
 	default "32"		if BR2_MIPS_OABI32
 	default "n32"		if BR2_MIPS_NABI32
 	default "64"		if BR2_MIPS_NABI64
+
+config BR2_READELF_ARCH_NAME
+	default "MIPS R3000"

arch/Config.in.nios2

@@ -3,3 +3,6 @@ config BR2_ARCH
 
 config BR2_ENDIAN
 	default "LITTLE"
+
+config BR2_READELF_ARCH_NAME
+	default "Altera Nios II"

arch/Config.in.or1k

@@ -3,3 +3,6 @@ config BR2_ARCH
 
 config BR2_ENDIAN
 	default "BIG"
+
+config BR2_READELF_ARCH_NAME
+	default "OpenRISC 1000"

arch/Config.in.powerpc

@@ -212,3 +212,7 @@ config BR2_GCC_TARGET_ABI
 	default "no-spe"		if BR2_PPC_ABI_no-spe
 	default "ibmlongdouble"		if BR2_PPC_ABI_ibmlongdouble
 	default "ieeelongdouble"	if BR2_PPC_ABI_ieeelongdouble
+
+config BR2_READELF_ARCH_NAME
+	default "PowerPC"	if BR2_powerpc
+	default "PowerPC64"	if BR2_powerpc64 || BR2_powerpc64le

arch/Config.in.sh

@@ -27,3 +27,6 @@ config BR2_ARCH
 config BR2_ENDIAN
 	default "LITTLE"	if BR2_sh4 || BR2_sh4a
 	default "BIG"		if BR2_sh2a || BR2_sh4eb || BR2_sh4aeb
+
+config BR2_READELF_ARCH_NAME
+	default "Renesas / SuperH SH"

arch/Config.in.sparc

@@ -28,3 +28,7 @@ config BR2_GCC_TARGET_CPU
 	default "leon3"		if BR2_sparc_leon3
 	default "v8"		if BR2_sparc_v8
 	default "ultrasparc"	if BR2_sparc_v9
+
+config BR2_READELF_ARCH_NAME
+	default "Sparc"		if BR2_sparc
+	default "Sparc v9"	if BR2_sparc64

arch/Config.in.x86

@@ -275,3 +275,7 @@ config BR2_GCC_TARGET_ARCH
 	default "c3"		if BR2_x86_c3
 	default "c3-2"		if BR2_x86_c32
 	default "geode"		if BR2_x86_geode
+
+config BR2_READELF_ARCH_NAME
+	default "Intel 80386"			if BR2_i386
+	default "Advanced Micro Devices X86-64" if BR2_x86_64

arch/Config.in.xtensa

@@ -54,3 +54,6 @@ config BR2_ENDIAN
 
 config BR2_ARCH
 	default "xtensa"	if BR2_xtensa
+
+config BR2_READELF_ARCH_NAME
+	default "Tensilica Xtensa Processor"