Commit 0bce126a authored by Thomas Weißschuh's avatar Thomas Weißschuh Committed by Thomas Bogendoerfer
Browse files

MIPS: Implement ARCH_HAS_CC_CAN_LINK 

The generic CC_CAN_LINK detection does not handle different byte orders
or ABIs. This may lead to userprogs which are not actually runnable on
the target kernel.

Use architecture-specific logic supporting byte orders instead.

Modern 64-bit toolchains default to a n32 libc, which are not
supported by all kernel configurations, as MIPS32_N32 is optional.
On 64-bit, test for a n32 ABI libc first and fall back to o64 and
o32 if necessary.

Link: https://lore.kernel.org/lkml/20260105100507-14db55e3-aa71-48bf-a6ac-33b186bd082f@linutronix.de/


Signed-off-by: default avatarThomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
parent e93bb4b7

arch/mips/Kconfig

+28 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ config MIPS 
	default y

	select ARCH_32BIT_OFF_T if !64BIT

	select ARCH_BINFMT_ELF_STATE if MIPS_FP_SUPPORT

	select ARCH_HAS_CC_CAN_LINK

	select ARCH_HAS_CPU_CACHE_ALIASING

	select ARCH_HAS_CPU_FINALIZE_INIT

	select ARCH_HAS_CURRENT_STACK_POINTER
@@ -3125,6 +3126,33 @@ config CC_HAS_MNO_BRANCH_LIKELY 
config CC_HAS_BROKEN_INLINE_COMPAT_BRANCH

	def_bool y if CC_IS_CLANG



config ARCH_CC_CAN_LINK_N32

	bool

	default $(cc_can_link_user,-mabi=n32 -EL) if MIPS32_N32 && CPU_LITTLE_ENDIAN

	default $(cc_can_link_user,-mabi=n32 -EB) if MIPS32_N32 && CPU_BIG_ENDIAN



config ARCH_CC_CAN_LINK_N64

	bool

	default $(cc_can_link_user,-mabi=64 -EL) if 64BIT && CPU_LITTLE_ENDIAN

	default $(cc_can_link_user,-mabi=64 -EB) if 64BIT && CPU_BIG_ENDIAN



config ARCH_CC_CAN_LINK_O32

	bool

	default $(cc_can_link_user,-mabi=32 -EL) if (32BIT || MIPS32_O32) && CPU_LITTLE_ENDIAN

	default $(cc_can_link_user,-mabi=32 -EB) if (32BIT || MIPS32_O32) && CPU_BIG_ENDIAN



config ARCH_CC_CAN_LINK

	def_bool ARCH_CC_CAN_LINK_N32 || ARCH_CC_CAN_LINK_N64 || ARCH_CC_CAN_LINK_O32



config ARCH_USERFLAGS

	string

	default "-mabi=n32 -EL" if ARCH_CC_CAN_LINK_N32 && CPU_LITTLE_ENDIAN

	default "-mabi=n32 -EB" if ARCH_CC_CAN_LINK_N32 && CPU_BIG_ENDIAN

	default "-mabi=64 -EL" if ARCH_CC_CAN_LINK_N64 && CPU_LITTLE_ENDIAN

	default "-mabi=64 -EB" if ARCH_CC_CAN_LINK_N64 && CPU_BIG_ENDIAN

	default "-mabi=32 -EL" if ARCH_CC_CAN_LINK_O32 && CPU_LITTLE_ENDIAN

	default "-mabi=32 -EB" if ARCH_CC_CAN_LINK_O32 && CPU_BIG_ENDIAN



menu "Power management options"



config ARCH_HIBERNATION_POSSIBLE