linux-kernel - Re: [build bug] x86_64, -git: Error: unknown pseudo-op: `.cfi_signal

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Message-Id: <20061015233341.ca644728.akpm@osdl.org>
Date:	Sun, 15 Oct 2006 23:33:41 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jan Beulich <jbeulich@...ell.com>, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...e.de>
Subject: Re: [build bug] x86_64, -git: Error: unknown pseudo-op:
 `.cfi_signal_frame'

On Mon, 16 Oct 2006 08:10:37 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> using latest -git i'm getting this build bug on gcc 3.4:
> 
>  arch/x86_64/kernel/entry.S: Assembler messages:
>  arch/x86_64/kernel/entry.S:157: Error: unknown pseudo-op: `.cfi_signal_frame'
>  arch/x86_64/kernel/entry.S:215: Error: unknown pseudo-op: `.cfi_signal_frame'
>  arch/x86_64/kernel/entry.S:333: Error: unknown pseudo-op: `.cfi_signal_frame'
>  arch/x86_64/kernel/entry.S:548: Error: unknown pseudo-op: `.cfi_signal_frame'
> 
>  gcc version 3.4.0 20040129 (Red Hat Linux 3.4.0-0.3)
> 
> using gcc 4.1 it doesnt happen
> 
>  gcc version 4.1.1 20060525 (Red Hat 4.1.1-1)
> 
> this is caused by the following commit:
> 
>  commit adf1423698f00d00b267f7dca8231340ce7d65ef
>  Author: Jan Beulich <jbeulich@...ell.com>
>  Date:   Tue Sep 26 10:52:41 2006 +0200
> 
> reverting that patch solves the build problem and the resulting kernel 
> builds and boots fine.
> 

That patch has obvious copy-n-paste errors:

i386:

 cflags-y += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
 AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
 
+# is .cfi_signal_frame supported too?
+cflags-y += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
+AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)

So that won't work.

x86_64 appears to get it right:

 cflags-y += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
 AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
 
+# is .cfi_signal_frame supported too?
+cflags-y += $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1,)
+AFLAGS += $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1,)

Later,

+#ifdef CONFIG_AS_CFI_SIGNAL_FRAME
+#define CFI_SIGNAL_FRAME .cfi_signal_frame
+#else
+#define CFI_SIGNAL_FRAME
+#endif

but it's obviously not working.   Wanna debug it a bit?
-
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