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-rwxr-xr-xarch/powerpc/tools/relocs_check.sh57
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/powerpc/tools/relocs_check.sh b/arch/powerpc/tools/relocs_check.sh
new file mode 100755
index 000000000..63792af00
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+++ b/arch/powerpc/tools/relocs_check.sh
@@ -0,0 +1,57 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# Copyright © 2015 IBM Corporation
+
+
+# This script checks the relocations of a vmlinux for "suspicious"
+# relocations.
+
+# based on relocs_check.pl
+# Copyright © 2009 IBM Corporation
+
+if [ $# -lt 3 ]; then
+ echo "$0 [path to objdump] [path to nm] [path to vmlinux]" 1>&2
+ exit 1
+fi
+
+# Have Kbuild supply the path to objdump and nm so we handle cross compilation.
+objdump="$1"
+nm="$2"
+vmlinux="$3"
+
+# Remove from the bad relocations those that match an undefined weak symbol
+# which will result in an absolute relocation to 0.
+# Weak unresolved symbols are of that form in nm output:
+# " w _binary__btf_vmlinux_bin_end"
+undef_weak_symbols=$($nm "$vmlinux" | awk '$1 ~ /w/ { print $2 }')
+
+bad_relocs=$(
+$objdump -R "$vmlinux" |
+ # Only look at relocation lines.
+ grep -E '\<R_' |
+ # These relocations are okay
+ # On PPC64:
+ # R_PPC64_RELATIVE, R_PPC64_NONE
+ # On PPC:
+ # R_PPC_RELATIVE, R_PPC_ADDR16_HI,
+ # R_PPC_ADDR16_HA,R_PPC_ADDR16_LO,
+ # R_PPC_NONE
+ grep -F -w -v 'R_PPC64_RELATIVE
+R_PPC64_NONE
+R_PPC64_UADDR64
+R_PPC_ADDR16_LO
+R_PPC_ADDR16_HI
+R_PPC_ADDR16_HA
+R_PPC_RELATIVE
+R_PPC_NONE' |
+ ([ "$undef_weak_symbols" ] && grep -F -w -v "$undef_weak_symbols" || cat)
+)
+
+if [ -z "$bad_relocs" ]; then
+ exit 0
+fi
+
+num_bad=$(echo "$bad_relocs" | wc -l)
+echo "WARNING: $num_bad bad relocations"
+echo "$bad_relocs"