diff options
Diffstat (limited to 'arch/powerpc/tools')
| -rwxr-xr-x | arch/powerpc/tools/checkpatch.sh | 22 | ||||
| -rwxr-xr-x | arch/powerpc/tools/gcc-check-mprofile-kernel.sh | 27 | ||||
| -rw-r--r-- | arch/powerpc/tools/head_check.sh | 80 | ||||
| -rwxr-xr-x | arch/powerpc/tools/relocs_check.sh | 62 | ||||
| -rwxr-xr-x | arch/powerpc/tools/unrel_branch_check.sh | 79 |
5 files changed, 270 insertions, 0 deletions
diff --git a/arch/powerpc/tools/checkpatch.sh b/arch/powerpc/tools/checkpatch.sh new file mode 100755 index 000000000..91c04802e --- /dev/null +++ b/arch/powerpc/tools/checkpatch.sh @@ -0,0 +1,22 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0+ +# Copyright 2018, Michael Ellerman, IBM Corporation. +# +# Wrapper around checkpatch that uses our preferred settings + +script_base=$(realpath $(dirname $0)) + +exec $script_base/../../../scripts/checkpatch.pl \ + --subjective \ + --no-summary \ + --show-types \ + --ignore ARCH_INCLUDE_LINUX \ + --ignore BIT_MACRO \ + --ignore COMPARISON_TO_NULL \ + --ignore EMAIL_SUBJECT \ + --ignore FILE_PATH_CHANGES \ + --ignore GLOBAL_INITIALISERS \ + --ignore LINE_SPACING \ + --ignore MULTIPLE_ASSIGNMENTS \ + --ignore DT_SPLIT_BINDING_PATCH \ + $@ diff --git a/arch/powerpc/tools/gcc-check-mprofile-kernel.sh b/arch/powerpc/tools/gcc-check-mprofile-kernel.sh new file mode 100755 index 000000000..137f3376a --- /dev/null +++ b/arch/powerpc/tools/gcc-check-mprofile-kernel.sh @@ -0,0 +1,27 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 + +set -e +set -o pipefail + +# To debug, uncomment the following line +# set -x + +# -mprofile-kernel is only supported on 64le, so this should not be invoked +# for other targets. Therefore we can pass in -m64 and -mlittle-endian +# explicitly, to take care of toolchains defaulting to other targets. + +# Test whether the compile option -mprofile-kernel exists and generates +# profiling code (ie. a call to _mcount()). +echo "int func() { return 0; }" | \ + $* -m64 -mlittle-endian -S -x c -O2 -p -mprofile-kernel - -o - \ + 2> /dev/null | grep -q "_mcount" + +# Test whether the notrace attribute correctly suppresses calls to _mcount(). + +echo -e "#include <linux/compiler.h>\nnotrace int func() { return 0; }" | \ + $* -m64 -mlittle-endian -S -x c -O2 -p -mprofile-kernel - -o - \ + 2> /dev/null | grep -q "_mcount" && \ + exit 1 + +exit 0 diff --git a/arch/powerpc/tools/head_check.sh b/arch/powerpc/tools/head_check.sh new file mode 100644 index 000000000..e32d3162e --- /dev/null +++ b/arch/powerpc/tools/head_check.sh @@ -0,0 +1,80 @@ +# Copyright © 2016 IBM Corporation + +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License +# as published by the Free Software Foundation; either version +# 2 of the License, or (at your option) any later version. + +# This script checks the head of a vmlinux for linker stubs that +# break our placement of fixed-location code for 64-bit. + +# based on relocs_check.pl +# Copyright © 2009 IBM Corporation + +# NOTE! +# +# If the build dies here, it's likely code in head_64.S/exception-64*.S or +# nearby, is branching to labels it can't reach directly, which results in the +# linker inserting branch stubs. This can move code around in ways that break +# the fixed section calculations (head-64.h). To debug this, disassemble the +# vmlinux and look for branch stubs (long_branch, plt_branch, etc.) in the +# fixed section region (0 - 0x8000ish). Check what code is calling those stubs, +# and perhaps change so a direct branch can reach. +# +# A ".linker_stub_catch" section is used to catch some stubs generated by +# early .text code, which tend to get placed at the start of the section. +# If there are too many such stubs, they can overflow this section. Expanding +# it may help (or reducing the number of stub branches). +# +# Linker stubs use the TOC pointer, so even if fixed section code could +# tolerate them being inserted into head code, they can't be allowed in low +# level entry code (boot, interrupt vectors, etc) until r2 is set up. This +# could cause the kernel to die in early boot. + +# Allow for verbose output +if [ "$V" = "1" ]; then + set -x +fi + +if [ $# -lt 2 ]; then + echo "$0 [path to nm] [path to vmlinux]" 1>&2 + exit 1 +fi + +# Have Kbuild supply the path to nm so we handle cross compilation. +nm="$1" +vmlinux="$2" + +# gcc-4.6-era toolchain make _stext an A (absolute) symbol rather than T +$nm "$vmlinux" | grep -e " [TA] _stext$" -e " t start_first_256B$" -e " a text_start$" -e " t start_text$" > .tmp_symbols.txt + + +vma=$(cat .tmp_symbols.txt | grep -e " [TA] _stext$" | cut -d' ' -f1) + +expected_start_head_addr=$vma + +start_head_addr=$(cat .tmp_symbols.txt | grep " t start_first_256B$" | cut -d' ' -f1) + +if [ "$start_head_addr" != "$expected_start_head_addr" ]; then + echo "ERROR: head code starts at $start_head_addr, should be $expected_start_head_addr" + echo "ERROR: try to enable LD_HEAD_STUB_CATCH config option" + echo "ERROR: see comments in arch/powerpc/tools/head_check.sh" + + exit 1 +fi + +top_vma=$(echo $vma | cut -d'0' -f1) + +expected_start_text_addr=$(cat .tmp_symbols.txt | grep " a text_start$" | cut -d' ' -f1 | sed "s/^0/$top_vma/") + +start_text_addr=$(cat .tmp_symbols.txt | grep " t start_text$" | cut -d' ' -f1) + +if [ "$start_text_addr" != "$expected_start_text_addr" ]; then + echo "ERROR: start_text address is $start_text_addr, should be $expected_start_text_addr" + echo "ERROR: try to enable LD_HEAD_STUB_CATCH config option" + echo "ERROR: see comments in arch/powerpc/tools/head_check.sh" + + exit 1 +fi + +rm -f .tmp_symbols.txt diff --git a/arch/powerpc/tools/relocs_check.sh b/arch/powerpc/tools/relocs_check.sh new file mode 100755 index 000000000..014e00e74 --- /dev/null +++ b/arch/powerpc/tools/relocs_check.sh @@ -0,0 +1,62 @@ +#!/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_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" + +# If we see this type of relocation it's an idication that +# we /may/ be using an old version of binutils. +if echo "$bad_relocs" | grep -q -F -w R_PPC64_UADDR64; then + echo "WARNING: You need at least binutils >= 2.19 to build a CONFIG_RELOCATABLE kernel" +fi diff --git a/arch/powerpc/tools/unrel_branch_check.sh b/arch/powerpc/tools/unrel_branch_check.sh new file mode 100755 index 000000000..8301efee1 --- /dev/null +++ b/arch/powerpc/tools/unrel_branch_check.sh @@ -0,0 +1,79 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0+ +# Copyright © 2016,2020 IBM Corporation +# +# This script checks the unrelocated code of a vmlinux for "suspicious" +# branches to relocated code (head_64.S code). + +# Have Kbuild supply the path to objdump and nm so we handle cross compilation. +objdump="$1" +nm="$2" +vmlinux="$3" + +kstart=0xc000000000000000 + +end_intr=0x$($nm -p "$vmlinux" | + sed -E -n '/\s+[[:alpha:]]\s+__end_interrupts\s*$/{s///p;q}') +if [ "$end_intr" = "0x" ]; then + exit 0 +fi + +# we know that there is a correct branch to +# __start_initialization_multiplatform, so find its address +# so we can exclude it. +sim=0x$($nm -p "$vmlinux" | + sed -E -n '/\s+[[:alpha:]]\s+__start_initialization_multiplatform\s*$/{s///p;q}') + +$objdump -D --no-show-raw-insn --start-address="$kstart" --stop-address="$end_intr" "$vmlinux" | +sed -E -n ' +# match lines that start with a kernel address +/^c[0-9a-f]*:\s*b/ { + # drop branches via ctr or lr + /\<b.?.?(ct|l)r/d + # cope with some differences between Clang and GNU objdumps + s/\<bt.?\s*[[:digit:]]+,/beq/ + s/\<bf.?\s*[[:digit:]]+,/bne/ + # tidy up + s/\s0x/ / + s/:// + # format for the loop below + s/^(\S+)\s+(\S+)\s+(\S+)\s*(\S*).*$/\1:\2:\3:\4/ + # strip out condition registers + s/:cr[0-7],/:/ + p +}' | { + +all_good=true +while IFS=: read -r from branch to sym; do + case "$to" in + c*) to="0x$to" + ;; + .+*) + to=${to#.+} + if [ "$branch" = 'b' ]; then + if (( to >= 0x2000000 )); then + to=$(( to - 0x4000000 )) + fi + elif (( to >= 0x8000 )); then + to=$(( to - 0x10000 )) + fi + printf -v to '0x%x' $(( "0x$from" + to )) + ;; + *) printf 'Unkown branch format\n' + ;; + esac + if [ "$to" = "$sim" ]; then + continue + fi + if (( to > end_intr )); then + if $all_good; then + printf '%s\n' 'WARNING: Unrelocated relative branches' + all_good=false + fi + printf '%s %s-> %s %s\n' "$from" "$branch" "$to" "$sym" + fi +done + +$all_good + +} |