From: Sylvain BERTRAND <sylvain.bertrand@gmail.com>
To: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/3] x86: tools: shell-ify calc_run_size perl-ism
Date: Wed, 31 Dec 2014 17:43:06 +0100 [thread overview]
Message-ID: <20141231164306.GA1872@dhcppc1> (raw)
Add the shell script.
Signed-off-by: Sylvain BERTRAND <sylvain.bertrand@gmail.com>
---
--- arch/x86/tools/calc_run_size.sh
+++ arch/x86/tools/calc_run_size.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+#
+# Calculate the amount of space needed to run the kernel, including room for
+# the .bss and .brk sections.
+#
+# Usage:
+# objdump -h a.out | sh calc_run_size.sh
+
+set -e
+
+file_offset=0
+mem_size=0
+
+while read Idx Name Size_hex VMA_hex LMA_hex File_off_hex Algn
+do
+ if [ "$Name" = ".bss" -o "$Name" = ".brk" ]; then
+ Size=$((0x$Size_hex))
+ File_off=$((0x$File_off_hex))
+
+ mem_size=$(($mem_size + $Size))
+
+ if [ $file_offset -eq 0 ]; then
+ file_offset=$File_off
+ elif [ $file_offset -ne $File_off ]; then
+ # BFD linker shows the same file offset in ELF.
+ # Gold linker shows them as consecutive.
+ if [ $(($file_offset + $mem_size)) -eq $(($File_off + $Size)) ]; then
+ continue
+ fi
+
+ printf "file_offset: 0x%x\n" $file_offset >&2
+ printf "mem_size: 0x%x\n" $mem_size >&2
+ printf "offset: 0x%x\n" $File_off >&2
+ printf "size: 0x%x\n" $Size >&2
+
+ echo ".bss and .brk are non-contiguous" >&2
+ exit 1
+ fi
+ fi
+done
+
+if [ $file_offset -eq 0 ]; then
+ echo "Never found .bss or .brk file offset" >&2
+ exit 1
+fi
+printf "%d\n" $(($mem_size + $file_offset))
reply other threads:[~2014-12-31 16:43 UTC|newest]
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