[LLVMdev] LLVM/Clang research questions

[Duncan Sands]

Hi Brent,

On 03/06/13 14:32, Brent Gregory Roth wrote:
> Hi Duncan,
>
> Are the segmented stacks actually on separate memory segments? My intended
> purpose for placing different datatypes on separate stacks is such that memory
> accesses to one datatype won't be allowed to overflow to another datatype.
>
> If they aren't, in fact, on separate memory segments, are you aware of a way to
> place a non-readable/-writable segment in between two other stack segments?

it is essentially the same thing as GCC's split stacks:

http://gcc.gnu.org/wiki/SplitStacks

Ciao, Duncan.

>
> Thanks,
>
> ~Brent Roth~
>
> On Mon, Jun 3, 2013 at 3:20 AM, Duncan Sands <baldrick at free.fr
> <mailto:baldrick at free.fr>> wrote:
>
>     Hi Brent, LLVM supports segmented stacks, I suggest you do a case
>     insensitive grep for segmented.stack in the source code (the . is
>     to match any character).
>
>     Ciao, Duncan.
>
>
>     On 03/06/13 00:35, Brent Gregory Roth wrote:
>
>         Greetings,
>
>         First, my apologies if I have incorrectly used any of these lists.
>
>         I'm sending this email in order to get some help on where in the
>         codebases for LLVM and/or Clang I should be looking in order to
>         accomplish the following:
>
>         - create 4 additional memory segment
>         - - 2 to be used as "additional stacks"
>         - - 2 to be used as "additional heaps"
>
>         - modify the stack frame and stack pointer registers (in order to make
>         use of the 2 "additional stacks")
>
>         - modify segment descriptors, as needed, to support reads/writes to the
>         additional segments
>
>         - modify which stack variables go to which of the three stacks
>         - - same for heaps
>
>         Thank you.
>
>         Sincerely,
>
>         ~Brent Roth~
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