From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/powerpc/tools/checkpatch.sh | 22 ++++++ .../tools/gcc-check-fpatchable-function-entry.sh | 26 +++++++ arch/powerpc/tools/gcc-check-mprofile-kernel.sh | 28 ++++++++ arch/powerpc/tools/head_check.sh | 80 ++++++++++++++++++++++ arch/powerpc/tools/relocs_check.sh | 43 ++++++++++++ arch/powerpc/tools/unrel_branch_check.sh | 79 +++++++++++++++++++++ 6 files changed, 278 insertions(+) create mode 100755 arch/powerpc/tools/checkpatch.sh create mode 100755 arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh create mode 100755 arch/powerpc/tools/gcc-check-mprofile-kernel.sh create mode 100644 arch/powerpc/tools/head_check.sh create mode 100755 arch/powerpc/tools/relocs_check.sh create mode 100755 arch/powerpc/tools/unrel_branch_check.sh (limited to 'arch/powerpc/tools') diff --git a/arch/powerpc/tools/checkpatch.sh b/arch/powerpc/tools/checkpatch.sh new file mode 100755 index 0000000000..91c04802ec --- /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-fpatchable-function-entry.sh b/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh new file mode 100755 index 0000000000..0670690350 --- /dev/null +++ b/arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh @@ -0,0 +1,26 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 + +set -e +set -o pipefail + +# To debug, uncomment the following line +# set -x + +# Output from -fpatchable-function-entry can only vary on ppc64 elfv2, so this +# should not be invoked for other targets. Therefore we can pass in -m64 and +# -mabi explicitly, to take care of toolchains defaulting to other targets. + +# Test whether the compile option -fpatchable-function-entry exists and +# generates appropriate code +echo "int func() { return 0; }" | \ + $* -m64 -mabi=elfv2 -S -x c -O2 -fpatchable-function-entry=2 - -o - 2> /dev/null | \ + grep -q "__patchable_function_entries" + +# Test whether nops are generated after the local entry point +echo "int x; int func() { return x; }" | \ + $* -m64 -mabi=elfv2 -S -x c -O2 -fpatchable-function-entry=2 - -o - 2> /dev/null | \ + awk 'BEGIN { RS = ";" } /\.localentry.*nop.*\n[[:space:]]*nop/ { print $0 }' | \ + grep -q "func:" + +exit 0 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 0000000000..a31a56016c --- /dev/null +++ b/arch/powerpc/tools/gcc-check-mprofile-kernel.sh @@ -0,0 +1,28 @@ +#!/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 64-bit, so this should not be invoked +# for 32-bit. We pass in -m64 explicitly, and -mbig-endian and -mlittle-endian +# are passed in from Kconfig, which takes 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 -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 \nnotrace int func() { return 0; }" | \ + $* -m64 -S -x c -O2 -p -mprofile-kernel - -o - \ + 2> /dev/null | grep -q "_mcount" && \ + exit 1 + +exit 0 diff --git a/arch/powerpc/tools/head_check.sh b/arch/powerpc/tools/head_check.sh new file mode 100644 index 0000000000..689907cda9 --- /dev/null +++ b/arch/powerpc/tools/head_check.sh @@ -0,0 +1,80 @@ +# Copyright © 2016 IBM Corporation + +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License +# as published by the Free Software Foundation; either version +# 2 of the License, or (at your option) any later version. + +# This script checks the head of a vmlinux for linker stubs that +# break our placement of fixed-location code for 64-bit. + +# based on relocs_check.pl +# Copyright © 2009 IBM Corporation + +# NOTE! +# +# If the build dies here, it's likely code in head_64.S/exception-64*.S or +# nearby, is branching to labels it can't reach directly, which results in the +# linker inserting branch stubs. This can move code around in ways that break +# the fixed section calculations (head-64.h). To debug this, disassemble the +# vmlinux and look for branch stubs (long_branch, plt_branch, etc.) in the +# fixed section region (0 - 0x8000ish). Check what code is calling those stubs, +# and perhaps change so a direct branch can reach. +# +# A ".linker_stub_catch" section is used to catch some stubs generated by +# early .text code, which tend to get placed at the start of the section. +# If there are too many such stubs, they can overflow this section. Expanding +# it may help (or reducing the number of stub branches). +# +# Linker stubs use the TOC pointer, so even if fixed section code could +# tolerate them being inserted into head code, they can't be allowed in low +# level entry code (boot, interrupt vectors, etc) until r2 is set up. This +# could cause the kernel to die in early boot. + +# Allow for verbose output +if [ "$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$" > .tmp_symbols.txt + + +vma=$(grep -e " [TA] _stext$" .tmp_symbols.txt | cut -d' ' -f1) + +expected_start_head_addr="$vma" + +start_head_addr=$(grep " t start_first_256B$" .tmp_symbols.txt | cut -d' ' -f1) + +if [ "$start_head_addr" != "$expected_start_head_addr" ]; then + echo "ERROR: head code starts at $start_head_addr, should be $expected_start_head_addr" 1>&2 + echo "ERROR: try to enable LD_HEAD_STUB_CATCH config option" 1>&2 + echo "ERROR: see comments in arch/powerpc/tools/head_check.sh" 1>&2 + + exit 1 +fi + +top_vma=$(echo "$vma" | cut -d'0' -f1) + +expected_start_text_addr=$(grep " a text_start$" .tmp_symbols.txt | cut -d' ' -f1 | sed "s/^0/$top_vma/") + +start_text_addr=$(grep " t start_text$" .tmp_symbols.txt | 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" 1>&2 + echo "ERROR: try to enable LD_HEAD_STUB_CATCH config option" 1>&2 + echo "ERROR: see comments in arch/powerpc/tools/head_check.sh" 1>&2 + + 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 0000000000..6b350e7501 --- /dev/null +++ b/arch/powerpc/tools/relocs_check.sh @@ -0,0 +1,43 @@ +#!/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 "$0 [path to objdump] [path to nm] [path to vmlinux]" 1>&2 + exit 1 +fi + +bad_relocs=$( +${srctree}/scripts/relocs_check.sh "$@" | + # 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' +) + +if [ -z "$bad_relocs" ]; then + exit 0 +fi + +num_bad=$(echo "$bad_relocs" | wc -l) +echo "WARNING: $num_bad bad relocations" +echo "$bad_relocs" diff --git a/arch/powerpc/tools/unrel_branch_check.sh b/arch/powerpc/tools/unrel_branch_check.sh new file mode 100755 index 0000000000..8301efee1e --- /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 + /\= 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 + +} -- cgit v1.2.3