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Commit 8c530ea3 authored by Matt Redfearn's avatar Matt Redfearn Committed by Ralf Baechle
Browse files

MIPS: Add CONFIG_RELOCATABLE Kconfig option 



Add option to KConfig to enable the kernel to relocate itself at
runtime.

Relocation is supported R2 and later of the MIPS architecture, 32bit
and 64bit. The platform is also required to provide support through
plat_get_fdt() added in a later patch.

Signed-off-by: default avatarMatt Redfearn <matt.redfearn@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: kernel-hardening@lists.openwall.com
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12987/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 61cd52d4

arch/mips/Kconfig

+18 −0
Original line number Diff line number Diff line
@@ -475,6 +475,7 @@ config MIPS_MALTA 
	select SYS_SUPPORTS_MULTITHREADING

	select SYS_SUPPORTS_SMARTMIPS

	select SYS_SUPPORTS_ZBOOT

	select SYS_SUPPORTS_RELOCATABLE

	select USE_OF

	select ZONE_DMA32 if 64BIT

	select BUILTIN_DTB
@@ -519,6 +520,7 @@ config MIPS_SEAD3 
	select SYS_SUPPORTS_SMARTMIPS

	select SYS_SUPPORTS_MICROMIPS

	select SYS_SUPPORTS_MIPS16

	select SYS_SUPPORTS_RELOCATABLE

	select USB_EHCI_BIG_ENDIAN_DESC

	select USB_EHCI_BIG_ENDIAN_MMIO

	select USE_OF
@@ -1158,6 +1160,13 @@ config ISA_DMA_API 
config HOLES_IN_ZONE

	bool



config SYS_SUPPORTS_RELOCATABLE

	bool

	help

	 Selected if the platform supports relocating the kernel.

	 The platform must provide plat_get_fdt() if it selects CONFIG_USE_OF

	 to allow access to command line and entropy sources.



#

# Endianness selection.  Sufficiently obscure so many users don't know what to

# answer,so we try hard to limit the available choices.  Also the use of a
@@ -2473,6 +2482,15 @@ config NUMA 
config SYS_SUPPORTS_NUMA

	bool



config RELOCATABLE

	bool "Relocatable kernel"

	depends on SYS_SUPPORTS_RELOCATABLE && (CPU_MIPS32_R2 || CPU_MIPS64_R2 || CPU_MIPS32_R6 || CPU_MIPS64_R6)

	help

	  This builds a kernel image that retains relocation information

	  so it can be loaded someplace besides the default 1MB.

	  The relocations make the kernel binary about 15% larger,

	  but are discarded at runtime



config RELOCATION_TABLE_SIZE

	hex "Relocation table size"

	depends on RELOCATABLE