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pending/2542: Re: ARM single step problem with instruction 0xa5ffffeb

>Number:         2542
>Category:       pending
>Synopsis:       Re: ARM single step problem with instruction 0xa5ffffeb
>Confidential:   yes
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          change-request
>Submitter-Id:   unknown
>Arrival-Date:   Wed Oct 22 13:08:01 UTC 2008
 On Wed, Oct 22, 2008 at 11:41:01AM -0000, wrote:
 > >Description:
 > I have a problem single stepping with a simple C program on ARM, with the instruction 0xa5ffffeb.
 > 8538:       a5ffffeb        ldrgeb  pc, [pc, #4075]!        ; 952b <__clz_tab+0x6b>
 > GDB stops with the error "Invalid update to pc in instruction".
 > The C program i'm trying to test is attached.
 > The ARM I use is an ARM v1136 (a bit specific...).
 I think there's something wrong with your environment.  That's not a
 valid instruction; PC is always aligned, so pc+4075 is unaligned.
 The middle of __clz_tab doesn't have function pointers in it.  And you
 can't do PC-relative loads with writeback.
 GDB is right to complain about that instruction.
 Daniel Jacobowitz

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