[PING 2][PATCH 0/8] Add SVE support for Aarch64 GDB

Alan Hayward Alan.Hayward@arm.com
Tue May 29 12:09:00 GMT 2018


Ping ping.

Thanks,
Alan.

> On 22 May 2018, at 09:34, Alan Hayward <Alan.Hayward@arm.com> wrote:
> 
> Ping.
> 
> 
> Thanks,
> Alan.
> 
>> On 11 May 2018, at 11:52, Alan Hayward <Alan.Hayward@arm.com> wrote:
>> 
>> This set of patches adds gdb support for SVE on AArch64.
>> 
>> SVE is the new vector extension for Aarch64. SVE is different in that the
>> length of a vector register is not fixed - it is can vary for different
>> hardware implementors. All code compiled for SVE is vector length agnostic.
>> The Linux kernel can then further restrict the vector length up to the
>> supported maximum for the hardware. Potentially different process and
>> threads can have different vector lengths, and they could change at any
>> time. However, in practice, we expect the vector length to remain constant
>> across the lifetime of a process.
>> This set of patches assumes the vector length will not change and either
>> warns once (when reading registers) or errors (when writing registers) if the
>> vector length has changed. A future set of patches will offer full support.
>> 
>> This series does not support gdbserver. However, where it makes sense I have
>> commonised as much code as possible and have added the groundwork in
>> gdbserver. Enabling gdbserver should be a small set of additional patches.
>> 
>> Core files and watchpoints are not yet supported.
>> 
>> The vector length is read from ptrace and is required to create the target
>> description for the running process. There is no hardcoded SVE XML.
>> 
>> The patches require recent linux header files for all the SVE ptrace macros.
>> To allow builds for older headers, I've added all required macros and
>> structures within ifdef checks. I'm not sure if this is the ideal solution.
>> When including kernel header code, I've not performed any reformatting (ie
>> they are not in GNU style).
>> 
>> One of the later patches adds functions to gdbserver regcache so that I can
>> add common functionality that works on gdb and gdbserver.
>> 
>> Given there are no working SVE systems available today, this was manually
>> tested on an Aarch64 SVE emulator running Ubuntu. In addition I've run make
>> check on X86 and Aarch64 builds for both unix and native-gdbserver.
>> 
>> 
>> Alan.
>> 
>> Alan Hayward (8):
>> Add Aarch64 SVE target description
>> Function for reading the Aarch64 SVE vector length.
>> Add SVE register defines
>> Enable SVE for GDB
>> Add aarch64 psuedo help functions
>> Aarch64 SVE pseudo register support
>> Add methods to gdbserver regcache and raw_compare
>> Ptrace support for Aarch64 SVE
>> 
>> gdb/Makefile.in                     |   1 +
>> gdb/aarch64-linux-nat.c             |  60 +++++-
>> gdb/aarch64-linux-tdep.c            |   5 +-
>> gdb/aarch64-tdep.c                  | 402 +++++++++++++++++++++++-------------
>> gdb/aarch64-tdep.h                  |  12 +-
>> gdb/arch/aarch64.c                  |  12 +-
>> gdb/arch/aarch64.h                  |  37 +++-
>> gdb/configure.nat                   |   2 +-
>> gdb/doc/gdb.texinfo                 |   4 +
>> gdb/features/aarch64-sve.c          | 158 ++++++++++++++
>> gdb/gdbserver/Makefile.in           |   1 +
>> gdb/gdbserver/configure.srv         |   1 +
>> gdb/gdbserver/linux-aarch64-tdesc.c |   3 +-
>> gdb/gdbserver/regcache.c            |  55 ++++-
>> gdb/gdbserver/regcache.h            |   8 +
>> gdb/nat/aarch64-sve-linux-ptrace.c  | 315 ++++++++++++++++++++++++++++
>> gdb/nat/aarch64-sve-linux-ptrace.h  | 193 +++++++++++++++++
>> gdb/regcache.c                      |  17 ++
>> gdb/regcache.h                      |   2 +
>> 19 files changed, 1122 insertions(+), 166 deletions(-)
>> create mode 100644 gdb/features/aarch64-sve.c
>> create mode 100644 gdb/nat/aarch64-sve-linux-ptrace.c
>> create mode 100644 gdb/nat/aarch64-sve-linux-ptrace.h
>> 
>> -- 
>> 2.15.1 (Apple Git-101)
>> 
> 



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