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Re: [Qemu-devel] [PATCH] ARM (Thumb) read from R15


From: Ulrich Hecht
Subject: Re: [Qemu-devel] [PATCH] ARM (Thumb) read from R15
Date: Mon, 2 Jul 2007 13:12:39 +0200
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On Saturday 30 June 2007 04:19, Paul Brook wrote:
> > QEMU does not set the Thumb bit when reading from R15 in Thumb mode.
>
> Neither does real hardware.

You are, unsurprisingly, right. The problem seems to be a different one. 
Quoting the ARM on "pop pc":

"In ARM architecture 5 and above, bit[0] of the loaded value determines 
whether execution continues after this branch in ARM state or in Thumb 
state[...] In T variants of architecture version 4, bit[0] of the loaded 
value is ignored and execution continues in Thumb state[...]"

My code is supposed to run on a 4T. I guess I'll have to implement an 
ARM_FEATURE_THUMB1.

CU
Uli

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