| Jiaxun Yang | 71e2f4d | 2019-10-20 22:43:14 +0800 | [diff] [blame] | 1 | # |
| 2 | # Loongson Processors' Support |
| 3 | # |
| 4 | |
| 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 | $(call cc-option,-march=loongson2f,-march=r4600) |
| Lichao Liu | 2984b3f | 2020-06-11 17:59:24 +0800 | [diff] [blame] | 11 | # |
| 12 | # Some versions of binutils, not currently mainline as of 2019/02/04, support |
| 13 | # an -mfix-loongson3-llsc flag which emits a sync prior to each ll instruction |
| 14 | # to work around a CPU bug (see __SYNC_loongson3_war in asm/sync.h for a |
| 15 | # description). |
| 16 | # |
| 17 | # We disable this in order to prevent the assembler meddling with the |
| 18 | # instruction that labels refer to, ie. if we label an ll instruction: |
| 19 | # |
| 20 | # 1: ll v0, 0(a0) |
| 21 | # |
| 22 | # ...then with the assembler fix applied the label may actually point at a sync |
| 23 | # instruction inserted by the assembler, and if we were using the label in an |
| 24 | # exception table the table would no longer contain the address of the ll |
| 25 | # instruction. |
| 26 | # |
| 27 | # Avoid this by explicitly disabling that assembler behaviour. If upstream |
| 28 | # binutils does not merge support for the flag then we can revisit & remove |
| 29 | # this later - for now it ensures vendor toolchains don't cause problems. |
| 30 | # |
| 31 | cflags-$(CONFIG_CPU_LOONGSON2EF) += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,) |
| 32 | |
| Jiaxun Yang | 71e2f4d | 2019-10-20 22:43:14 +0800 | [diff] [blame] | 33 | # Enable the workarounds for Loongson2f |
| 34 | ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS |
| 35 | ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-nop,),) |
| 36 | $(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-nop) |
| 37 | else |
| 38 | cflags-$(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 |
| 45 | endif |
| 46 | |
| Jiaxun Yang | b13812d | 2020-09-23 18:33:12 +0800 | [diff] [blame] | 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 += $(call cc-option,-mno-loongson-mmi) |
| 50 | |
| Jiaxun Yang | 71e2f4d | 2019-10-20 22:43:14 +0800 | [diff] [blame] | 51 | # |
| 52 | # Loongson Machines' Support |
| 53 | # |
| 54 | |
| Jiaxun Yang | 71e2f4d | 2019-10-20 22:43:14 +0800 | [diff] [blame] | 55 | cflags-$(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 |