Revert: "arch: drop now useless support for FDPIC"

This reverts commit 58dcd28dfbed481becb822b009583a63efbc6ffa.

ARM supports FDPIC, so this code is needed once again.

Signed-off-by: Ben Wolsieffer <Ben.Wolsieffer@hefring.com>
Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

arch/Config.in

@@ -12,6 +12,9 @@ config BR2_SOFT_FLOAT
 config BR2_USE_MMU
 	bool
 
+config BR2_ARCH_HAS_FDPIC_SUPPORT
+	bool
+
 choice
 	prompt "Target Architecture"
 	default BR2_i386
@@ -430,6 +433,7 @@ endif
 choice
 	prompt "Target Binary Format"
 	default BR2_BINFMT_ELF if BR2_USE_MMU
+	default BR2_BINFMT_FDPIC if BR2_ARCH_HAS_FDPIC_SUPPORT
 	default BR2_BINFMT_FLAT
 
 config BR2_BINFMT_ELF
@@ -441,6 +445,16 @@ config BR2_BINFMT_ELF
 	  and executables used across different architectures and
 	  operating systems.
 
+config BR2_BINFMT_FDPIC
+	bool "FDPIC"
+	depends on BR2_ARCH_HAS_FDPIC_SUPPORT
+	select BR2_BINFMT_SUPPORTS_SHARED
+	help
+	  ELF FDPIC binaries are based on ELF, but allow the individual
+	  load segments of a binary to be located in memory
+	  independently of each other. This makes this format ideal for
+	  use in environments where no MMU is available.
+
 config BR2_BINFMT_FLAT
 	bool "FLAT"
 	depends on !BR2_USE_MMU

package/uclibc/uclibc.mk

@@ -57,6 +57,13 @@ UCLIBC_LOCALES = \
 endif
 
 # noMMU binary formats
+ifeq ($(BR2_BINFMT_FDPIC),y)
+define UCLIBC_BINFMT_CONFIG
+	$(call KCONFIG_DISABLE_OPT,UCLIBC_FORMAT_FLAT,$(@D)/.config)
+	$(call KCONFIG_DISABLE_OPT,UCLIBC_FORMAT_FLAT_SEP_DATA,$(@D)/.config)
+	$(call KCONFIG_ENABLE_OPT,UCLIBC_FORMAT_FDPIC_ELF,$(@D)/.config)
+endef
+endif
 ifeq ($(BR2_BINFMT_FLAT),y)
 define UCLIBC_BINFMT_CONFIG
 	$(call KCONFIG_ENABLE_OPT,UCLIBC_FORMAT_FLAT)