1# 2# Loongson Processors' Support 3# 4 5# Only gcc >= 4.4 have Loongson specific support 6cflags-$(CONFIG_CPU_LOONGSON2EF) += -Wa,--trap 7cflags-$(CONFIG_CPU_LOONGSON2E) += \ 8 $(call cc-option,-march=loongson2e,-march=r4600) 9cflags-$(CONFIG_CPU_LOONGSON2F) += \ 10 $(call cc-option,-march=loongson2f,-march=r4600) 11# 12# Some versions of binutils, not currently mainline as of 2019/02/04, support 13# an -mfix-loongson3-llsc flag which emits a sync prior to each ll instruction 14# to work around a CPU bug (see __SYNC_loongson3_war in asm/sync.h for a 15# description). 16# 17# We disable this in order to prevent the assembler meddling with the 18# instruction that labels refer to, ie. if we label an ll instruction: 19# 20# 1: ll v0, 0(a0) 21# 22# ...then with the assembler fix applied the label may actually point at a sync 23# instruction inserted by the assembler, and if we were using the label in an 24# exception table the table would no longer contain the address of the ll 25# instruction. 26# 27# Avoid this by explicitly disabling that assembler behaviour. If upstream 28# binutils does not merge support for the flag then we can revisit & remove 29# this later - for now it ensures vendor toolchains don't cause problems. 30# 31cflags-$(CONFIG_CPU_LOONGSON2EF) += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,) 32 33# Enable the workarounds for Loongson2f 34ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS 35 ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-nop,),) 36 $(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-nop) 37 else 38 cflags-$(CONFIG_CPU_NOP_WORKAROUNDS) += -Wa$(comma)-mfix-loongson2f-nop 39 endif 40 ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-jump,),) 41 $(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-jump) 42 else 43 cflags-$(CONFIG_CPU_JUMP_WORKAROUNDS) += -Wa$(comma)-mfix-loongson2f-jump 44 endif 45endif 46 47# Some -march= flags enable MMI instructions, and GCC complains about that 48# support being enabled alongside -msoft-float. Thus explicitly disable MMI. 49cflags-y += $(call cc-option,-mno-loongson-mmi) 50 51# 52# Loongson Machines' Support 53# 54 55cflags-$(CONFIG_MACH_LOONGSON2EF) += -I$(srctree)/arch/mips/include/asm/mach-loongson2ef -mno-branch-likely 56load-$(CONFIG_LEMOTE_FULOONG2E) += 0xffffffff80100000 57load-$(CONFIG_LEMOTE_MACH2F) += 0xffffffff80200000 58