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Date: Sat, 27 Dec 2008 09:24:35 +0100
From: "Laurent Desnogues" <laurent.desnogues@gmail.com>
Subject: Re: [Qemu-devel] qemu-mips strange jump !!!
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To: qemu-devel@nongnu.org

On Fri, Dec 26, 2008 at 7:36 PM, Alessandro Montano <alex@exit.it> wrote:
> This is my first post, so sorry for any error ...
> I'm developing a DVB-S emulator based on qemu-mips.
> I'm adding all the device, once a time, but I notice a strange problem that
> crashes my emulator.
>
> It seems to do  bad jumps!
>
> In brief ... I run this command
> *./bin/-qemu-system-mips -L . mips_bios.bin -d int,exec,op,in_asm
> *and it genereates this log
>
> IN:
> 0x80071fc4:  lui    at,0x8007
> 0x80071fc8:  lw    a1,0xC094(at)
> 0x80071fcc:  lui    a0,0x8007
> 0x80071fd0:  addiu    a0,a0,0xD060
> 0x80071fd4:  jal    0x8006d76c  <-  this is the right address
> 0x80071fd8:  nop
[...]
> IN:
> 0x8006d968:  andi    t9,t9,0xdf  <-  but this is a wrong jump !!!
> 0x8006d96c:  j    0x8006d90c
> 0x8006d970:  ori    t9,t9,0x20

You can't rely on logs to see the flow of a program. What may
happen in the logs you're showing is that the code @0x8006d76c
may have been previously translated and so it isn't shown in the
logs.

I don't think what you're showing us is the real problem :)


Laurent