Re: [RFA 3/5] Prec: x86 segment register support: target

[Doug Evans <dje@google.com>]

On Mon, Mar 22, 2010 at 7:33 AM, Mark Kettenis <mark.kettenis@xs4all.nl> wrote:
>> From: Hui Zhu <teawater@gmail.com>
>> Date: Mon, 22 Mar 2010 22:02:52 +0800
>>
>> Thanks Michael and Daniel.
>>
>> I make a patch to add base of segments registers to x86-32:
>> (gdb) info reg
>> eax            0xffffd514     -10988
>> ecx            0x1eda96c5     517641925
>> edx            0x1    1
>> ebx            0xf7fb1ff4     -134537228
>> esp            0xffffd488     0xffffd488
>> ebp            0xffffd488     0xffffd488
>> esi            0x8048510      134513936
>> edi            0x80483d0      134513616
>> eip            0x8048487      0x8048487 <main+3>
>> eflags         0x246  [ PF ZF IF ]
>> cs             0x23   35
>> ss             0x2b   43
>> ds             0x2b   43
>> es             0x2b   43
>> fs             0x0    0
>> gs             0x63   99
>> cs_base        0x0    0
>> ss_base        0x0    0
>> ds_base        0x0    0
>> es_base        0x0    0
>> fs_base        0x0    0
>> gs_base        0xf7e528d0     -135976752
>>
>> I try it in x86-32 pc and 32bit code in x86-64.  It works OK.
>
> Sorry, but I don't think adding these xx_base registers is a good
> idea.  They are not acrhitected registers so they don't beling in the
> list of registers.
>

fwiw, I think it's a great idea.