Re: [RFC PATCH 14/24] gdbstub: Add members to identify registers to GDBFeature

[Alex Bennée]

Akihiko Odaki <akihiko.odaki@daynix.com> writes:

> These members will be used to help plugins to identify registers.

I'm wary of exposing gdb'isms directly to plugins. However making stuff
easier for the gdbstub internals is ok. I shall reserve judgement until
I've read the rest of the series.


> The added members in instances of GDBFeature dynamically generated by
> CPUs will be filled in later changes.
>
> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> ---
>  include/exec/gdbstub.h  |  2 ++
>  scripts/feature_to_c.py | 14 +++++++++++++-
>  2 files changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
> index 9b3da5b257..6da4af9612 100644
> --- a/include/exec/gdbstub.h
> +++ b/include/exec/gdbstub.h
> @@ -13,6 +13,8 @@
>  typedef struct GDBFeature {
>      const char *xmlname;
>      const char *xml;
> +    const char *name;
> +    const char * const *regs;
>      int num_regs;
>  } GDBFeature;
>  
> diff --git a/scripts/feature_to_c.py b/scripts/feature_to_c.py
> index 8eb8c81cf8..11b1bc05c9 100755
> --- a/scripts/feature_to_c.py
> +++ b/scripts/feature_to_c.py
> @@ -46,7 +46,9 @@ def writeliteral(indent, bytes):
>          sys.stderr.write(f'unexpected start tag: {element.tag}\n')
>          exit(1)
>  
> +    feature_name = element.attrib['name']
>      regnum = 0
> +    regnames = []
>      regnums = []
>      tags = ['feature']
>      for event, element in events:
> @@ -63,6 +65,7 @@ def writeliteral(indent, bytes):
>                  if 'regnum' in element.attrib:
>                      regnum = int(element.attrib['regnum'])
>  
> +                regnames.append(element.attrib['name'])
>                  regnums.append(regnum)
>                  regnum += 1
>  
> @@ -81,6 +84,15 @@ def writeliteral(indent, bytes):
>      writeliteral(8, bytes(os.path.basename(input), 'utf-8'))
>      sys.stdout.write(',\n')
>      writeliteral(8, read)
> -    sys.stdout.write(f',\n        {num_regs},\n    }},\n')
> +    sys.stdout.write(',\n')
> +    writeliteral(8, bytes(feature_name, 'utf-8'))
> +    sys.stdout.write(',\n        (const char * const []) {\n')
> +
> +    for index, regname in enumerate(regnames):
> +        sys.stdout.write(f'            [{regnums[index] - base_reg}] =\n')
> +        writeliteral(16, bytes(regname, 'utf-8'))
> +        sys.stdout.write(',\n')
> +
> +    sys.stdout.write(f'        }},\n        {num_regs},\n    }},\n')
>  
>  sys.stdout.write('    { NULL }\n};\n')


-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro