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91 lines
2.0 KiB
91 lines
2.0 KiB
#!/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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grep "^CONFIG_KASAN=y$" .config >/dev/null |
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if [ $? -eq 0 ] |
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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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__prom_init_toc_start __prom_init_toc_end btext_setup_display TOC. |
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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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if [ $KBUILD_VERBOSE ]; then |
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if [ $KBUILD_VERBOSE -ne 0 ]; then |
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echo "Checking prom_init.o symbol '$UNDEF'" |
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fi |
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fi |
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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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