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When Loongson3 LL/SC errata workarounds are enabled (ie.
CONFIG_CPU_LOONGSON3_WORKAROUNDS=y) run a tool to scan through the
compiled kernel & ensure that the workaround is applied correctly. That
is, ensure that:
- Every LL or LLD instruction is preceded by a sync instruction.
- Any branches from within an LL/SC loop to outside of that loop
target a sync instruction.
Reasoning for these conditions can be found by reading the comment above
the definition of __SYNC_loongson3_war in arch/mips/include/asm/sync.h.
This tool will help ensure that we don't inadvertently introduce code
paths that miss the required workarounds.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-kernel@vger.kernel.org
45 lines
962 B
Makefile
45 lines
962 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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# ===========================================================================
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# Post-link MIPS pass
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# ===========================================================================
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#
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# 1. Check that Loongson3 LL/SC workarounds are applied correctly
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# 2. Insert relocations into vmlinux
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PHONY := __archpost
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__archpost:
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-include include/config/auto.conf
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include scripts/Kbuild.include
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CMD_LS3_LLSC = arch/mips/tools/loongson3-llsc-check
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quiet_cmd_ls3_llsc = LLSCCHK $@
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cmd_ls3_llsc = $(CMD_LS3_LLSC) $@
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CMD_RELOCS = arch/mips/boot/tools/relocs
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quiet_cmd_relocs = RELOCS $@
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cmd_relocs = $(CMD_RELOCS) $@
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# `@true` prevents complaint when there is nothing to be done
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vmlinux: FORCE
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@true
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ifeq ($(CONFIG_CPU_LOONGSON3_WORKAROUNDS),y)
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$(call if_changed,ls3_llsc)
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endif
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ifeq ($(CONFIG_RELOCATABLE),y)
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$(call if_changed,relocs)
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endif
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%.ko: FORCE
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@true
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clean:
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@true
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PHONY += FORCE clean
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FORCE:
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.PHONY: $(PHONY)
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