Re: ptrace(2) interface for TLSBASE

[Andrew Cagney <andrew.cagney%gmail.com@localhost>]

Where is it in a core file?

On Tue, 3 Dec 2019 at 11:18, Kamil Rytarowski <n54%gmx.com@localhost> wrote:
>
> TLSBASE is stored on a selection of ports in a dedicated mcontext entry,
> out of gpregs.
>
> In the amd64 case mcontext looks like this:
>
> typedef struct {
>         __gregset_t     __gregs;
>         __greg_t        _mc_tlsbase;
>         __fpregset_t    __fpregs;
> } mcontext_t;
>
> The same situation is for: i386, arm, m68k and mips.
>
> This patch implements the accessors for amd64:
>
> http://netbsd.org/~kamil/patch-00199-TLSBASE.txt
>
> Does it look correct? If so I will add the same code for i386,
> i386-on-amd64, arm, m68k and mips.
>
> I'm not completely sure as l_private might be desynced with TLSBASE that
> was updated without letting the kernel know.
>
> I intend to get this change merged into -9, before 9.0.
>
> This interface pending to be introduced in GDB/NetBSD.
>
> NB. FS/GS in x86 __gpregs is confusing as it is not TLS base.
>