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Re: arm7t and the BL thumb instruction?

From: "Frank Ch. Eigler" <fche at redhat dot com>
To: Brandon Warhurst <roboknight at starband dot net>
Cc: sid at sources dot redhat dot com
Date: Tue, 6 May 2003 13:01:23 -0400
Subject: Re: arm7t and the BL thumb instruction?
References: <002801c31316$80de0cb0$6500a8c0@STARBAND.NET> <20030505150808.GA3998@redhat.com> <004e01c3131c$5c76fde0$6500a8c0@STARBAND.NET> <20030505154850.GB3998@redhat.com> <001c01c3132d$f4d87b70$6500a8c0@STARBAND.NET> <20030505174719.GF3998@redhat.com> <000301c31384$33a8fef0$6500a8c0@STARBAND.NET>

Hi -

> [...] I think I might have located the problem, but am not sure.  If
> I read the code correctly, the Thumb decoder always makes
> entire_insn = base_insn >> 16 ... and if you are
> expecting the next instruction to appear in the upper end of base_insn this
> might make sense.  But if it for some reason appeared in the lower end of
> base_insn, you would throw away the instruction before anything got a chance
> to be executed.  [...]

Yikes.  I guess the thumb part hasn't been tested after it was last
regenerated.  I can fix this, though don't have any arm+thumb
elf binaries handy - do you?

- FChE

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References:
- arm7t and the BL thumb instruction?
  - From: Brandon Warhurst
- Re: arm7t and the BL thumb instruction?
  - From: Frank Ch. Eigler
- Re: arm7t and the BL thumb instruction?
  - From: Frank Ch. Eigler

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