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Re: [Tinycc-devel] [PATCH] arm: Handle __builtin_frame_address(1) correc

From: Thomas Preud'homme
Subject: Re: [Tinycc-devel] [PATCH] arm: Handle __builtin_frame_address(1) correctly
Date: Wed, 5 Dec 2012 11:26:32 +0100
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Le vendredi 30 novembre 2012 00:43:07, Daniel Glöckner a écrit :
> You should not look at a leaf function to derive the GCC stack frame.
> It is probably different from the generic stack frame because GCC
> knows this function will never be part of a stack trace done by
> another function of the final program.
> Take a look at arch/arm/kernel/stacktrace.c inside the Linux kernel.
> They assume that every function pushes {fp, sp, lr, pc} and that
> fp points to the address where pc is stored. I don't know why
> GCC pushes pc. I can only imagine this being done to keep the
> stack aligned to 8 bytes. Or maybe it is for exception handling
> or association of stack frame debug info..

> I have once seen a page in MSDN describing the ARM stack frame of
> Windows CE. I don't know if ARM specified how stack frames should look
> like.

Hi Kirill,

did you make any progress on the issue since Daniel's comments? Could you let 
me know when you push a patch so that I can test it and bump master to equal 
the mob branch?
Grischka, what do you think of releasing a rc1 after that? We got plenty of 
features merged since last release and 3 years start to be quite a long time. 
I know there is still many things to improve, including some I care about, but 
it might attract new contributions or new users to have a more recent release.

What do you think?

Best regards,

Thomas Preud'homme

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