RE: GDB6.2.1 : Queries about mips simulator configuration

["Monika Chaddha" <monika at acmet dot com>]

Thanks a lot for the reply.
My queries regarding configuration part of Simulator are clear now. :-)

Thanks & regards
Monika Chaddha


>-----Original Message-----
>From: gdb-owner@sources.redhat.com
[mailto:gdb-owner@sources.redhat.com] On
>Behalf Of cgd@broadcom.com
>Sent: Wednesday, September 15, 2004 11:21 AM
>To: Monika Chaddha
>Cc: gdb@sources.redhat.com; acmet@vsnl.net
>Subject: Re: GDB6.2.1 : Queries about mips simulator configuration
>
>I've been really busy.  I've not had time to look at mips16 patch
>yet...
>
>At Tue, 14 Sep 2004 16:30:41 +0530, Monika Chaddha wrote:
>> Queries:
>>
>> 1. 'sim_gen': According to my understanding this is name of simulator
>> generator. For the targets in which 32-bit instructions are supported
it
>> is assigned as 'IGEN' and the targets in which 16-bit instructions or
32
>> and 16-bit both are supported, it is assigned as 'M16'.
>
>Mostly.  There's another option, "MULTI" for use by simulators which
>support multiple CPU types at once.
>
>What these do is control the way 'igen' is invoked to generate the
>simulator.
>
>> Are 'IGEN' and 'M16' two different simulator generators or they are
>> sharing something?
>> Is M16 using 'IGEN' indirectly?
>>
>> I have gone through 'makefile.in' file also but could not gather much
>> information.
>
>AFAICT, they both generate simulators in approximately the same way,
>but different parameters are used for each.
>
>In Makefile.in, compare tmp-igen with tmp-m16.
>
>Most of this stuff predates my maintainership -- i've never touched
>MIPS16, really, for instance.
>
>
>> 2. sim_m16_machine="-M mips16,mipsIII"
>>
>> I had reported this bug that gdb6.0 was not building for mips16 after
>> that you have done this modification " (sim_m16_machine): Include
>> mipsIII" to fix this problem. I have also attached the mails for
>> reference.
>
>Right.  MIPS16 doesn't exist in a vacuum.  Any machine that implements
>MIPS16 must also implement a MIPS I...MIPS64 ISA as well, which in
>fact is the underlying ISA used by the machine.
>
>The MIPS16 support needs some basic information and functions related
>to the underlying ISA.
>
>
>
>cgd