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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This script checks vmlinux to ensure that all functions can call ftrace_caller() either directly,
# or through the stub, ftrace_tramp_text, at the end of kernel text.
# Error out if any command fails
set -e
# 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="$2"
stext_addr=$($nm "$vmlinux" | grep -e " [TA] _stext$" | \
cut -d' ' -f1 | tr '[:lower:]' '[:upper:]')
ftrace_caller_addr=$($nm "$vmlinux" | grep -e " T ftrace_caller$" | \
cut -d' ' -f1 | tr '[:lower:]' '[:upper:]')
ftrace_tramp_addr=$($nm "$vmlinux" | grep -e " T ftrace_tramp_text$" | \
cut -d' ' -f1 | tr '[:lower:]' '[:upper:]')
ftrace_caller_offset=$(echo "ibase=16;$ftrace_caller_addr - $stext_addr" | bc)
ftrace_tramp_offset=$(echo "ibase=16;$ftrace_tramp_addr - $ftrace_caller_addr" | bc)
sz_32m=$(printf "%d" 0x2000000)
sz_64m=$(printf "%d" 0x4000000)
# ftrace_caller - _stext < 32M
if [ "$ftrace_caller_offset" -ge "$sz_32m" ]; then
echo "ERROR: ftrace_caller (0x$ftrace_caller_addr) is beyond 32MiB of _stext" 1>&2
echo "ERROR: consider disabling CONFIG_FUNCTION_TRACER, or reducing the size \
of kernel text" 1>&2
exit 1
fi
# ftrace_tramp_text - ftrace_caller < 64M
if [ "$ftrace_tramp_offset" -ge "$sz_64m" ]; then
echo "ERROR: kernel text extends beyond 64MiB from ftrace_caller" 1>&2
echo "ERROR: consider disabling CONFIG_FUNCTION_TRACER, or reducing the size \
of kernel text" 1>&2
exit 1
fi
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