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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/powerpc/kernel/prom_init_check.sh
Initial import
Diffstat (limited to 'arch/powerpc/kernel/prom_init_check.sh')
-rw-r--r--arch/powerpc/kernel/prom_init_check.sh69
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh
new file mode 100644
index 000000000..12640f7e7
--- /dev/null
+++ b/arch/powerpc/kernel/prom_init_check.sh
@@ -0,0 +1,69 @@
+#!/bin/sh
+#
+# Copyright © 2008 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 prom_init.o to see what external symbols it
+# is using, if it finds symbols not in the whitelist it returns
+# an error. The point of this is to discourage people from
+# intentionally or accidentally adding new code to prom_init.c
+# which has side effects on other parts of the kernel.
+
+# If you really need to reference something from prom_init.o add
+# it to the list below:
+
+WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush
+_end enter_prom memcpy memset reloc_offset __secondary_hold
+__secondary_hold_acknowledge __secondary_hold_spinloop __start
+strcmp strcpy strlcpy strlen strncmp strstr logo_linux_clut224
+reloc_got2 kernstart_addr memstart_addr linux_banner _stext
+__prom_init_toc_start __prom_init_toc_end btext_setup_display TOC."
+
+NM="$1"
+OBJ="$2"
+
+ERROR=0
+
+for UNDEF in $($NM -u $OBJ | awk '{print $2}')
+do
+ # On 64-bit nm gives us the function descriptors, which have
+ # a leading . on the name, so strip it off here.
+ UNDEF="${UNDEF#.}"
+
+ if [ $KBUILD_VERBOSE ]; then
+ if [ $KBUILD_VERBOSE -ne 0 ]; then
+ echo "Checking prom_init.o symbol '$UNDEF'"
+ fi
+ fi
+
+ OK=0
+ for WHITE in $WHITELIST
+ do
+ if [ "$UNDEF" = "$WHITE" ]; then
+ OK=1
+ break
+ fi
+ done
+
+ # ignore register save/restore funcitons
+ case $UNDEF in
+ _restgpr_*|_restgpr0_*|_rest32gpr_*)
+ OK=1
+ ;;
+ _savegpr_*|_savegpr0_*|_save32gpr_*)
+ OK=1
+ ;;
+ esac
+
+ if [ $OK -eq 0 ]; then
+ ERROR=1
+ echo "Error: External symbol '$UNDEF' referenced" \
+ "from prom_init.c" >&2
+ fi
+done
+
+exit $ERROR