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62 lines
1.6 KiB
62 lines
1.6 KiB
#!/bin/sh |
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# SPDX-License-Identifier: GPL-2.0-or-later |
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# Copyright © 2015 IBM Corporation |
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# This script checks the relocations of a vmlinux for "suspicious" |
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# relocations. |
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# based on relocs_check.pl |
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# Copyright © 2009 IBM Corporation |
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if [ $# -lt 3 ]; then |
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echo "$0 [path to objdump] [path to nm] [path to vmlinux]" 1>&2 |
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exit 1 |
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fi |
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# Have Kbuild supply the path to objdump and nm so we handle cross compilation. |
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objdump="$1" |
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nm="$2" |
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vmlinux="$3" |
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# Remove from the bad relocations those that match an undefined weak symbol |
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# which will result in an absolute relocation to 0. |
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# Weak unresolved symbols are of that form in nm output: |
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# " w _binary__btf_vmlinux_bin_end" |
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undef_weak_symbols=$($nm "$vmlinux" | awk '$1 ~ /w/ { print $2 }') |
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bad_relocs=$( |
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$objdump -R "$vmlinux" | |
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# Only look at relocation lines. |
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grep -E '\<R_' | |
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# These relocations are okay |
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# On PPC64: |
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# R_PPC64_RELATIVE, R_PPC64_NONE |
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# On PPC: |
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# R_PPC_RELATIVE, R_PPC_ADDR16_HI, |
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# R_PPC_ADDR16_HA,R_PPC_ADDR16_LO, |
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# R_PPC_NONE |
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grep -F -w -v 'R_PPC64_RELATIVE |
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R_PPC64_NONE |
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R_PPC_ADDR16_LO |
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R_PPC_ADDR16_HI |
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R_PPC_ADDR16_HA |
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R_PPC_RELATIVE |
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R_PPC_NONE' | |
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([ "$undef_weak_symbols" ] && grep -F -w -v "$undef_weak_symbols" || cat) |
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) |
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if [ -z "$bad_relocs" ]; then |
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exit 0 |
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fi |
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num_bad=$(echo "$bad_relocs" | wc -l) |
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echo "WARNING: $num_bad bad relocations" |
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echo "$bad_relocs" |
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# If we see this type of relocation it's an idication that |
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# we /may/ be using an old version of binutils. |
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if echo "$bad_relocs" | grep -q -F -w R_PPC64_UADDR64; then |
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echo "WARNING: You need at least binutils >= 2.19 to build a CONFIG_RELOCATABLE kernel" |
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fi
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