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# Copyright © 2016 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 the head of a vmlinux for linker stubs that # break our placement of fixed-location code for 64-bit. # based on relocs_check.pl # Copyright © 2009 IBM Corporation # NOTE! # # If the build dies here, it's likely code in head_64.S/exception-64*.S or # nearby, is branching to labels it can't reach directly, which results in the # linker inserting branch stubs. This can move code around in ways that break # the fixed section calculations (head-64.h). To debug this, disassemble the # vmlinux and look for branch stubs (long_branch, plt_branch, etc.) in the # fixed section region (0 - 0x8000ish). Check what code is calling those stubs, # and perhaps change so a direct branch can reach. # # A ".linker_stub_catch" section is used to catch some stubs generated by # early .text code, which tend to get placed at the start of the section. # If there are too many such stubs, they can overflow this section. Expanding # it may help (or reducing the number of stub branches). # # Linker stubs use the TOC pointer, so even if fixed section code could # tolerate them being inserted into head code, they can't be allowed in low # level entry code (boot, interrupt vectors, etc) until r2 is set up. This # could cause the kernel to die in early boot. # Turn this on if you want more debug output: # set -x 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" # gcc-4.6-era toolchain make _stext an A (absolute) symbol rather than T $nm "$vmlinux" | grep -e " [TA] _stext$" -e " t start_first_256B$" -e " a text_start$" -e " t start_text$" -m4 > .tmp_symbols.txt vma=$(cat .tmp_symbols.txt | grep -e " [TA] _stext$" | cut -d' ' -f1) expected_start_head_addr=$vma start_head_addr=$(cat .tmp_symbols.txt | grep " t start_first_256B$" | cut -d' ' -f1) if [ "$start_head_addr" != "$expected_start_head_addr" ]; then echo "ERROR: head code starts at $start_head_addr, should be $expected_start_head_addr" echo "ERROR: try to enable LD_HEAD_STUB_CATCH config option" echo "ERROR: see comments in arch/powerpc/tools/head_check.sh" exit 1 fi top_vma=$(echo $vma | cut -d'0' -f1) expected_start_text_addr=$(cat .tmp_symbols.txt | grep " a text_start$" | cut -d' ' -f1 | sed "s/^0/$top_vma/") start_text_addr=$(cat .tmp_symbols.txt | grep " t start_text$" | cut -d' ' -f1) if [ "$start_text_addr" != "$expected_start_text_addr" ]; then echo "ERROR: start_text address is $start_text_addr, should be $expected_start_text_addr" echo "ERROR: try to enable LD_HEAD_STUB_CATCH config option" echo "ERROR: see comments in arch/powerpc/tools/head_check.sh" exit 1 fi rm -f .tmp_symbols.txt
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