Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
51 lines
1.6 KiB
Bash
Executable File
51 lines
1.6 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# This script checks vmlinux to ensure that all functions can call ftrace_caller() either directly,
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# or through the stub, ftrace_tramp_text, at the end of kernel text.
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# Error out if any command fails
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set -e
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# Allow for verbose output
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if [ "$V" = "1" ]; then
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set -x
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fi
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if [ $# -lt 2 ]; then
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echo "$0 [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 nm so we handle cross compilation.
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nm="$1"
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vmlinux="$2"
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stext_addr=$($nm "$vmlinux" | grep -e " [TA] _stext$" | \
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cut -d' ' -f1 | tr '[:lower:]' '[:upper:]')
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ftrace_caller_addr=$($nm "$vmlinux" | grep -e " T ftrace_caller$" | \
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cut -d' ' -f1 | tr '[:lower:]' '[:upper:]')
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ftrace_tramp_addr=$($nm "$vmlinux" | grep -e " T ftrace_tramp_text$" | \
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cut -d' ' -f1 | tr '[:lower:]' '[:upper:]')
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ftrace_caller_offset=$(echo "ibase=16;$ftrace_caller_addr - $stext_addr" | bc)
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ftrace_tramp_offset=$(echo "ibase=16;$ftrace_tramp_addr - $ftrace_caller_addr" | bc)
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sz_32m=$(printf "%d" 0x2000000)
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sz_64m=$(printf "%d" 0x4000000)
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# ftrace_caller - _stext < 32M
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if [ "$ftrace_caller_offset" -ge "$sz_32m" ]; then
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echo "ERROR: ftrace_caller (0x$ftrace_caller_addr) is beyond 32MiB of _stext" 1>&2
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echo "ERROR: consider disabling CONFIG_FUNCTION_TRACER, or reducing the size \
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of kernel text" 1>&2
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exit 1
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fi
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# ftrace_tramp_text - ftrace_caller < 64M
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if [ "$ftrace_tramp_offset" -ge "$sz_64m" ]; then
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echo "ERROR: kernel text extends beyond 64MiB from ftrace_caller" 1>&2
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echo "ERROR: consider disabling CONFIG_FUNCTION_TRACER, or reducing the size \
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of kernel text" 1>&2
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exit 1
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fi
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