[linux.git] / arch / mips / vdso / Kconfig

# For the pre-R6 code in arch/mips/vdso/vdso.h for locating
# the base address of VDSO, the linker will emit a R_MIPS_PC32
# relocation in binutils > 2.25 but it will fail with older versions
# because that relocation is not supported for that symbol. As a result
# of which we are forced to disable the VDSO symbols when building
# with < 2.25 binutils on pre-R6 kernels. For more references on why we
# can't use other methods to get the base address of VDSO please refer to
# the comments on that file.
#
# GCC (at least up to version 9.2) appears to emit function calls that make use
# of the GOT when targeting microMIPS, which we can't use in the VDSO due to
# the lack of relocations. As such, we disable the VDSO for microMIPS builds.

config MIPS_LD_CAN_LINK_VDSO
	def_bool LD_VERSION >= 22500 || LD_IS_LLD

config MIPS_DISABLE_VDSO
	def_bool CPU_MICROMIPS || (!CPU_MIPSR6 && !MIPS_LD_CAN_LINK_VDSO)
Commit	Line	Data
e91946d6 NC	1	# For the pre-R6 code in arch/mips/vdso/vdso.h for locating
	2	# the base address of VDSO, the linker will emit a R_MIPS_PC32
	3	# relocation in binutils > 2.25 but it will fail with older versions
	4	# because that relocation is not supported for that symbol. As a result
	5	# of which we are forced to disable the VDSO symbols when building
	6	# with < 2.25 binutils on pre-R6 kernels. For more references on why we
	7	# can't use other methods to get the base address of VDSO please refer to
	8	# the comments on that file.
	9	#
	10	# GCC (at least up to version 9.2) appears to emit function calls that make use
	11	# of the GOT when targeting microMIPS, which we can't use in the VDSO due to
	12	# the lack of relocations. As such, we disable the VDSO for microMIPS builds.
	13
	14	config MIPS_LD_CAN_LINK_VDSO
052c805a	15	def_bool LD_VERSION >= 22500 \|\| LD_IS_LLD
e91946d6 NC	16
	17	config MIPS_DISABLE_VDSO
	18	def_bool CPU_MICROMIPS \|\| (!CPU_MIPSR6 && !MIPS_LD_CAN_LINK_VDSO)