[Bug libc/22433] linux x86/x86_64 <sys/ptrace.h> does not provide PTRACE_GET_THREAD_AREA (and more)

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22433

Carlos O'Donell <carlos at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |carlos at redhat dot com

--- Comment #1 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Mark Mentovai from comment #0)
> PTRACE_GET_THREAD_AREA is missing from <sys/ptrace.h> on x86 and x86_64
> Linux.
> 
> It’s provided by the kernel’s <asm/ptrace-abi.h>, and in turn by
> <linux/ptrace.h>, but these are incompatible with glibc’s <sys/ptrace.h>.
> <asm/ptrace-abi.h> offers:
> 
> #define PTRACE_GET_THREAD_AREA    25
> 
> Others missing (strictly Linux x86/x86_64-specific):
> 
> #define PTRACE_SET_THREAD_AREA    26
> 
> #ifdef __x86_64__
> # define PTRACE_ARCH_PRCTL        30
> #endif
> 
> #define PTRACE_SYSEMU             31
> #define PTRACE_SYSEMU_SINGLESTEP  32
> 
> #define PTRACE_SINGLEBLOCK      33      /* resume execution until next
> branch */

If the constants are present in a published upstream kernel, then what's left
is for someone to update the glibc headers to match the kernel values.

The last update was in July to remove PTRACE_SEIZE_DEVEL
(60e2846e2633a990bdf474004a373bde54c0bc5f), and before that in February to add
PTRACE_EVENT_STOP (3f67d1a7021ed3184830511636a0867faec730fe).

I don't see anything "incompatible" with the kernel and glibc headers. Work
just has to be done to synchronize them.

If the constants are machine dependent then there needs to be a split up where
the machine-dependent ptrace.h has to be provided to override the default.

Right now, nobody has done the work.

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