95 lines
2.1 KiB
Bash
95 lines
2.1 KiB
Bash
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# Copyright © 2008 IBM Corporation
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#
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# This script checks prom_init.o to see what external symbols it
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# is using, if it finds symbols not in the whitelist it returns
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# an error. The point of this is to discourage people from
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# intentionally or accidentally adding new code to prom_init.c
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# which has side effects on other parts of the kernel.
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# If you really need to reference something from prom_init.o add
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# it to the list below:
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has_renamed_memintrinsics()
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{
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grep -q "^CONFIG_KASAN=y$" ${KCONFIG_CONFIG} && \
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! grep -q "^CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX=y" ${KCONFIG_CONFIG}
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}
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if has_renamed_memintrinsics
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then
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MEM_FUNCS="__memcpy __memset"
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else
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MEM_FUNCS="memcpy memset"
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fi
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WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush
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_end enter_prom $MEM_FUNCS reloc_offset __secondary_hold
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__secondary_hold_acknowledge __secondary_hold_spinloop __start
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logo_linux_clut224 btext_prepare_BAT
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reloc_got2 kernstart_addr memstart_addr linux_banner _stext
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btext_setup_display TOC. relocate"
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NM="$1"
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OBJ="$2"
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ERROR=0
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check_section()
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{
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file=$1
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section=$2
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size=$(objdump -h -j $section $file 2>/dev/null | awk "\$2 == \"$section\" {print \$3}")
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size=${size:-0}
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if [ $size -ne 0 ]; then
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ERROR=1
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echo "Error: Section $section not empty in prom_init.c" >&2
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fi
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}
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for UNDEF in $($NM -u $OBJ | awk '{print $2}')
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do
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# On 64-bit nm gives us the function descriptors, which have
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# a leading . on the name, so strip it off here.
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UNDEF="${UNDEF#.}"
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case "$KBUILD_VERBOSE" in
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*1*)
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echo "Checking prom_init.o symbol '$UNDEF'" ;;
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esac
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OK=0
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for WHITE in $WHITELIST
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do
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if [ "$UNDEF" = "$WHITE" ]; then
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OK=1
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break
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fi
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done
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# ignore register save/restore funcitons
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case $UNDEF in
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_restgpr_*|_restgpr0_*|_rest32gpr_*)
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OK=1
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;;
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_savegpr_*|_savegpr0_*|_save32gpr_*)
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OK=1
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;;
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esac
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if [ $OK -eq 0 ]; then
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ERROR=1
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echo "Error: External symbol '$UNDEF' referenced" \
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"from prom_init.c" >&2
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fi
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done
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check_section $OBJ .data
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check_section $OBJ .bss
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check_section $OBJ .init.data
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exit $ERROR
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