riscv: Check relocations at compile time

# 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)" "$(NM)" "$@"

# `@true` prevents complaint when there is nothing to be done

vmlinux: FORCE

	@true

ifdef CONFIG_RELOCATABLE

	$(call if_changed,relocs_check)

endif

%.ko: FORCE

	@true

clean:

	@true

PHONY += FORCE clean

FORCE:

.PHONY: $(PHONY)

#!/bin/sh

# SPDX-License-Identifier: GPL-2.0-or-later

# Based on powerpc relocs_check.sh

# This script checks the relocations of a vmlinux for "suspicious"

# relocations.

if [ $# -lt 3 ]; then

        echo "$0 [path to objdump] [path to nm] [path to vmlinux]" 1>&2

        exit 1

fi

bad_relocs=$(

${srctree}/scripts/relocs_check.sh "$@" |

	# These relocations are okay

	#	R_RISCV_RELATIVE

	grep -F -w -v 'R_RISCV_RELATIVE'

)

if [ -z "$bad_relocs" ]; then

	exit 0

fi

num_bad=$(echo "$bad_relocs" | wc -l)

echo "WARNING: $num_bad bad relocations"

echo "$bad_relocs"