linux-kernel - Re: [PATCH 0/3] ftrace: handle kernel code remove

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Message-ID: <20080815100600.GA29180@elte.hu>
Date:	Fri, 15 Aug 2008 12:06:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	Clark Williams <williams@...hat.com>, srostedt@...hat.com,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH 0/3] ftrace: handle kernel code remove


* Ingo Molnar <mingo@...e.hu> wrote:

> >   http://redhat.com/~mingo/misc/config-Fri_Aug_15_11_34_53_CEST_2008.bad
> 
> the problem is that i'm building a 32-bit kernel on a 64-bit host, and 
> the scripts/recordmcount.pl script does not create the temporary 
> object files in the proper (32-bit) output ELF format.

the crude hack below got me going for now - but this needs a proper 
solution.

	Ingo

--------------------->
>From 52a4a65bcb5b796b7ad83ad069968c476142706f Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@...e.hu>
Date: Mon, 9 Jun 2008 20:54:22 +0200
Subject: [PATCH] ftrace: scripts/recordmcount.pl cross-build hack

hack around:

 ld: Relocatable linking with relocations from format elf32-i386 (init/.tmp_gl_calibrate.o) to format elf64-x86-64 (init/.tmp_mx_calibrate.o) i  CC      arch/x86/mm/extable.o
 objcopy: 'init/.tmp_mx_calibrate.o': No such file
 rm: cannot remove `init/.tmp_mx_calibrate.o': No such file or directory
 ld: Relocatable linking with relocations from format elf32-i386 (arch/x86/mm/extable.o) to format elf64-x86-64 (arch/x86/mm/.tmp_mx_extable.o) is not supported
 mv: cannot stat `arch/x86/mm/.tmp_mx_extable.o': No such file or directory
 ld: Relocatable linking with relocations from format elf32-i386 (arch/x86/mm/fault.o) to format elf64-x86-64 (arch/x86/mm/.tmp_mx_fault.o) is not supported

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 scripts/recordmcount.pl |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 44b4b23..41b55e0 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -108,6 +108,20 @@ if ($#ARGV < 6) {
 
 my ($arch, $objdump, $objcopy, $cc, $ld, $nm, $rm, $mv, $inputfile) = @ARGV;
 
+if ($arch eq "i386") {
+  $ld = "ld -m elf_i386";
+  $objdump = "objdump -M i386";
+  $objcopy = "objcopy -O elf32-i386";
+  $cc = "gcc -m32";
+}
+
+if ($arch eq "x86_64") {
+  $ld = "ld -m elf_x86_64";
+  $objdump = "objdump -M x86-64";
+  $objcopy = "objcopy -O elf64-i386";
+  $cc = "gcc -m64";
+}
+
 $objdump = "objdump" if ((length $objdump) == 0);
 $objcopy = "objcopy" if ((length $objcopy) == 0);
 $cc = "gcc" if ((length $cc) == 0);
--
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