[TUHS] user struct on SYSIII / V7
Brantley Coile
brantleycoile at me.com
Sat Nov 14 05:42:08 AEST 2015
iPhone email
> On Nov 13, 2015, at 2:38 PM, Brantley Coile <brantleycoile at icloud.com> wrote:
>
> For performance reasons an assembly symbol "u" was defined to be a fixed address. That allowed us to use constructions like u.u_procp to generate a single address. It was very fast. Does this help?
>
> iPhone email
>
>> On Nov 13, 2015, at 2:33 PM, Oliver Lehmann <lehmann at ans-netz.de> wrote:
>>
>>
>> Oliver Lehmann <lehmann at ans-netz.de> wrote:
>>
>>> u module
>>> $segmented
>>> $abs %F600
>>>
>>> global
>>>
>>> _u array [%572 byte]
>>>
>>> end u
>>
>> By any way - is here someone on the list understanding Z8000 PLZ/ASM? ;)
>>
>> The problem is, that "u" must be available in the address space on this
>> location for the kernel to function correctly:
>>
>> # define UBASE 0x3E00F600 /* kernel virtual addr of user struct */
>>
>> And with the above ASM code, it is placed on 0x0100F600. I also tried
>> of course $abs 0x3E00F600 but it makes no difference. It is always
>> placed at 0x0100F600 and I have zero clue why
>>
>> the original object from the system:
>>
>> #67 nm /usr/sys/conf/u.o
>> 3e00f600 A _u
>> 01000000 s u_d
>> 0000 s u_p
>>
>>
>> my object generated from my u.s:
>>
>> #68 nm u.o
>> 0100f600 A _u
>> 01000000 s u_d
>> 0000 s u_p
>>
>> Somehow I need to get the address right.... This is why I wanted to
>> look up how the original SYSIII or V7 was doing it (even if the asm
>> would be of course completely different).
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