linux-kernel - [PATCH 1/3] x86: tools: shell-ify calc_run

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Message-ID: <20141230153647.GA5031@dhcppc1>
Date:	Tue, 30 Dec 2014 16:36:47 +0100
From:	Sylvain BERTRAND <sylvain.bertrand@...il.com>
To:	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] x86: tools: shell-ify calc_run_size perl-ism

Add the shell script.

Signed-off-by: Sylvain BERTRAND <sylvain.bertrand@...il.com>
---
--- a/arch/x86/tools/calc_run_size.sh
+++ b/arch/x86/tools/calc_run_size.sh
@@ -0,0 +1,42 @@
+#!/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 VMA LMA File_off Algn
+do
+	if [ "$Name" = ".bss" -o "$Name" = ".brk" ]; then
+		mem_size=$(($mem_size + 0x$Size))
+		if [ $((0x$file_offset)) -eq 0 ]; then
+			file_offset=$File_off
+		elif [ $((0x$file_offset)) -ne $((0x$File_off)) ]; then
+			# BFD linker shows the same file offset in ELF.
+			# Gold linker shows them as consecutive.
+			if [ $((0x$file_offset + $mem_size)) -eq $((0x$File_off + 0x$Size)) ]; then
+				continue
+			fi
+			
+			printf "file_offset: 0x%x\n" $((0x$file_offset))
+			printf "mem_size: 0x%x\n" $mem_size
+			printf "offset: 0x%x\n" $((0x$File_off))
+			printf "size: 0x%x\n" $((0x$Size))
+
+			echo ".bss and .brk are non-contiguous"
+			exit 1
+		fi
+	fi
+done
+
+if [ $((0x$file_offset)) -eq 0 ]; then
+	echo "Never found .bss or .brk file offset"
+	exit 1
+fi
+printf "%d\n" $(($mem_size + 0x$file_offset))
--
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