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