diff options
Diffstat (limited to 'arch/mips/loongson64/Platform')
| -rw-r--r-- | arch/mips/loongson64/Platform | 57 |
1 files changed, 2 insertions, 55 deletions
diff --git a/arch/mips/loongson64/Platform b/arch/mips/loongson64/Platform index d5eb94c9edb4..49c9889e3d56 100644 --- a/arch/mips/loongson64/Platform +++ b/arch/mips/loongson64/Platform @@ -1,60 +1,7 @@ # -# Loongson Processors' Support -# - - -cflags-$(CONFIG_CPU_LOONGSON64) += -Wa,--trap - -# -# Some versions of binutils, not currently mainline as of 2019/02/04, support -# an -mfix-loongson3-llsc flag which emits a sync prior to each ll instruction -# to work around a CPU bug (see __SYNC_loongson3_war in asm/sync.h for a -# description). -# -# We disable this in order to prevent the assembler meddling with the -# instruction that labels refer to, ie. if we label an ll instruction: -# -# 1: ll v0, 0(a0) -# -# ...then with the assembler fix applied the label may actually point at a sync -# instruction inserted by the assembler, and if we were using the label in an -# exception table the table would no longer contain the address of the ll -# instruction. -# -# Avoid this by explicitly disabling that assembler behaviour. If upstream -# binutils does not merge support for the flag then we can revisit & remove -# this later - for now it ensures vendor toolchains don't cause problems. -# -cflags-$(CONFIG_CPU_LOONGSON64) += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,) - -# -# binutils from v2.25 on and gcc starting from v4.9.0 treat -march=loongson3a -# as MIPS64 R2; older versions as just R1. This leaves the possibility open -# that GCC might generate R2 code for -march=loongson3a which then is rejected -# by GAS. The cc-option can't probe for this behaviour so -march=loongson3a -# can't easily be used safely within the kbuild framework. -# -ifeq ($(call cc-ifversion, -ge, 0409, y), y) - ifeq ($(call ld-ifversion, -ge, 225000000, y), y) - cflags-$(CONFIG_CPU_LOONGSON64) += \ - $(call cc-option,-march=loongson3a -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) - else - cflags-$(CONFIG_CPU_LOONGSON64) += \ - $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) - endif -else - cflags-$(CONFIG_CPU_LOONGSON64) += \ - $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) -endif - -# Some -march= flags enable MMI instructions, and GCC complains about that -# support being enabled alongside -msoft-float. Thus explicitly disable MMI. -cflags-y += $(call cc-option,-mno-loongson-mmi) - -# # Loongson Machines' Support # -platform-$(CONFIG_MACH_LOONGSON64) += loongson64/ -cflags-$(CONFIG_MACH_LOONGSON64) += -I$(srctree)/arch/mips/include/asm/mach-loongson64 -mno-branch-likely +cflags-$(CONFIG_MACH_LOONGSON64) += -I$(srctree)/arch/mips/include/asm/mach-loongson64 +cflags-$(CONFIG_CC_HAS_MNO_BRANCH_LIKELY) += -mno-branch-likely load-$(CONFIG_CPU_LOONGSON64) += 0xffffffff80200000 |