48 lines
1.8 KiB
Plaintext
48 lines
1.8 KiB
Plaintext
|
#
|
||
|
|
# Loongson Processors' Support
|
||
|
|
#
|
||
|
|
|
||
|
|
cflags-$(CONFIG_CPU_LOONGSON2EF) += -Wa,--trap
|
||
|
|
cflags-$(CONFIG_CPU_LOONGSON2E) += -march=loongson2e
|
||
|
|
cflags-$(CONFIG_CPU_LOONGSON2F) += -march=loongson2f
|
||
|
|
#
|
||
|
|
# Some versions of binutils, not currently mainline as of 2019/02/04, support
|
||
|
|
# an -mfix-loongson3-llsc flag which emits a sync prior to each ll instruction
|
||
|
|
# to work around a CPU bug (see __SYNC_loongson3_war in asm/sync.h for a
|
||
|
|
# description).
|
||
|
|
#
|
||
|
|
# We disable this in order to prevent the assembler meddling with the
|
||
|
|
# instruction that labels refer to, ie. if we label an ll instruction:
|
||
|
|
#
|
||
|
|
# 1: ll v0, 0(a0)
|
||
|
|
#
|
||
|
|
# ...then with the assembler fix applied the label may actually point at a sync
|
||
|
|
# instruction inserted by the assembler, and if we were using the label in an
|
||
|
|
# exception table the table would no longer contain the address of the ll
|
||
|
|
# instruction.
|
||
|
|
#
|
||
|
|
# Avoid this by explicitly disabling that assembler behaviour. If upstream
|
||
|
|
# binutils does not merge support for the flag then we can revisit & remove
|
||
|
|
# this later - for now it ensures vendor toolchains don't cause problems.
|
||
|
|
#
|
||
|
|
cflags-$(CONFIG_CPU_LOONGSON2EF) += $(call cc-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
|
||
|
|
|
||
|
|
# Enable the workarounds for Loongson2f
|
||
|
|
ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS
|
||
|
|
cflags-$(CONFIG_CPU_NOP_WORKAROUNDS) += -Wa,-mfix-loongson2f-nop
|
||
|
|
cflags-$(CONFIG_CPU_JUMP_WORKAROUNDS) += -Wa,-mfix-loongson2f-jump
|
||
|
|
endif
|
||
|
|
|
||
|
|
# Some -march= flags enable MMI instructions, and GCC complains about that
|
||
|
|
# support being enabled alongside -msoft-float. Thus explicitly disable MMI.
|
||
|
|
cflags-y += $(call cc-option,-mno-loongson-mmi)
|
||
|
|
|
||
|
|
#
|
||
|
|
# Loongson Machines' Support
|
||
|
|
#
|
||
|
|
|
||
|
|
cflags-$(CONFIG_MACH_LOONGSON2EF) += -I$(srctree)/arch/mips/include/asm/mach-loongson2ef
|
||
|
|
cflags-$(CONFIG_CC_HAS_MNO_BRANCH_LIKELY) += -mno-branch-likely
|
||
|
|
load-$(CONFIG_LEMOTE_FULOONG2E) += 0xffffffff80100000
|
||
|
|
load-$(CONFIG_LEMOTE_MACH2F) += 0xffffffff80200000
|