guiandrade added a comment.

In D62931#1699746 <https://reviews.llvm.org/D62931#1699746>, @labath wrote:

> In D62931#1697999 <https://reviews.llvm.org/D62931#1697999>, @guiandrade 
> wrote:
>
> > Thank you for looking into this, @labath
> >
> > I'd like to fix that, but I'm not sure if I understand the code well 
> > enough/ it's not clear to me what the solution would look like.
> >
> > > I think the only reasonable way to do that would be to change the 
> > > RegisterInfo offset for BND registers to mean the gdb-remote offset
> >
> > Would that involve hard-coding an extra offset at RegisterInfos_x86_64.h:28 
> > <https://github.com/llvm/llvm-project/blob/2946cd701067404b99c39fb29dc9c74bd7193eb3/lldb/source/Plugins/Process/Utility/RegisterInfos_x86_64.h#L28>
> >  and RegisterInfos_i386.h:32 
> > <https://github.com/llvm/llvm-project/blob/2946cd701067404b99c39fb29dc9c74bd7193eb3/lldb/source/Plugins/Process/Utility/RegisterInfos_i386.h#L32>?
>
>
> I would very much like to avoid adding new members to the RegisterInfo 
> struct. As this stuff is specific to the x86 linux context, I'd like to keep 
> this stuff there, if necessary then via keeping a side-table of "ptrace" 
> offsets for each of the register (though I am hoping there's some better way 
> to achieve that).
>
> > 
> > 
> >> change any code which uses it for the OS context offset to do something 
> >> else (the only place doing something like that should be 
> >> RegisterContextLinux_x86_64.cpp)
> > 
> > Would that be NativeRegisterContextLinux_x86_64.cpp 
> > <https://github.com/llvm/llvm-project/blob/63e5fb76ecfed3434252868d8cf07d676f979f2f/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_x86_64.cpp>?
> >  If yes, the idea would be to somehow remove that extra factor before the 
> > `ptrace` calls?
>
> Yes, I meant `NativeRegisterContextLinux_x86_64`. And yes, the idea is to 
> remove that factor, or recompute that the ptrace offset in some other way. 
> This could be a side table, a switch on the register set type, or whatever is 
> the simplest.


I updated this change with an initial attempt to implement that idea to see if 
we're on the same page. Please let me know what you think. Thank you!


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D62931/new/

https://reviews.llvm.org/D62931



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