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OpenCloudOS-Kernel/arch/riscv/Makefile.postlink

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riscv: Check relocations at compile time Relocating kernel at runtime is done very early in the boot process, so it is not convenient to check for relocations there and react in case a relocation was not expected. There exists a script in scripts/ that extracts the relocations from vmlinux that is then used at postlink to check the relocations. Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20230329045329.64565-6-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2023-03-29 12:53:28 +08:00
# SPDX-License-Identifier: GPL-2.0
# ===========================================================================
# Post-link riscv pass
# ===========================================================================
#
# Check that vmlinux relocations look sane
PHONY := __archpost
__archpost:
-include include/config/auto.conf
include $(srctree)/scripts/Kbuild.include
quiet_cmd_relocs_check = CHKREL $@
cmd_relocs_check = \
$(CONFIG_SHELL) $(srctree)/arch/riscv/tools/relocs_check.sh "$(OBJDUMP)" "$(NM)" "$@"
riscv: Use --emit-relocs in order to move .rela.dyn in init To circumvent an issue where placing the relocations inside the init sections produces empty relocations, use --emit-relocs. But to avoid carrying those relocations in vmlinux, use an intermediate vmlinux.relocs file which is a copy of vmlinux *before* stripping its relocations. Suggested-by: Björn Töpel <bjorn@kernel.org> Suggested-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20230329045329.64565-7-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2023-03-29 12:53:29 +08:00
ifdef CONFIG_RELOCATABLE
quiet_cmd_cp_vmlinux_relocs = CPREL vmlinux.relocs
cmd_cp_vmlinux_relocs = cp vmlinux vmlinux.relocs
quiet_cmd_relocs_strip = STRIPREL $@
cmd_relocs_strip = $(OBJCOPY) --remove-section='.rel.*' \
--remove-section='.rel__*' \
--remove-section='.rela.*' \
--remove-section='.rela__*' $@
endif
riscv: Check relocations at compile time Relocating kernel at runtime is done very early in the boot process, so it is not convenient to check for relocations there and react in case a relocation was not expected. There exists a script in scripts/ that extracts the relocations from vmlinux that is then used at postlink to check the relocations. Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20230329045329.64565-6-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2023-03-29 12:53:28 +08:00
# `@true` prevents complaint when there is nothing to be done
vmlinux: FORCE
@true
ifdef CONFIG_RELOCATABLE
$(call if_changed,relocs_check)
riscv: Use --emit-relocs in order to move .rela.dyn in init To circumvent an issue where placing the relocations inside the init sections produces empty relocations, use --emit-relocs. But to avoid carrying those relocations in vmlinux, use an intermediate vmlinux.relocs file which is a copy of vmlinux *before* stripping its relocations. Suggested-by: Björn Töpel <bjorn@kernel.org> Suggested-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20230329045329.64565-7-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2023-03-29 12:53:29 +08:00
$(call if_changed,cp_vmlinux_relocs)
$(call if_changed,relocs_strip)
riscv: Check relocations at compile time Relocating kernel at runtime is done very early in the boot process, so it is not convenient to check for relocations there and react in case a relocation was not expected. There exists a script in scripts/ that extracts the relocations from vmlinux that is then used at postlink to check the relocations. Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20230329045329.64565-6-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2023-03-29 12:53:28 +08:00
endif
%.ko: FORCE
@true
clean:
@true
PHONY += FORCE clean
FORCE:
.PHONY: $(PHONY)