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Date: Sat, 27 Dec 2008 12:24:37 +0100
From: "andrzej zaborowski" <balrogg@gmail.com>
Subject: Re: [Qemu-devel] qemu-mips strange jump !!!
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To: qemu-devel@nongnu.org

2008/12/27 Laurent Desnogues <laurent.desnogues@gmail.com>:
> 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.

Not with "in_asm" alone, but "exec" should show the flow of execution,
except DEBUG_EXEC is undefined by default.  Maybe this should generate
a runtime warning.

Cheers