Re: [Qemu-devel] [PATCH] functional ARM semihosting under GDB

[Peter Maydell]

On 17 November 2014 12:32, Peter Maydell <address@hidden> wrote:
> This (the extra command line option to specify where semihosting
> should go) is definitely a feature we should add. I think it's
> possible to make use of the QemuOpts infrastructure to support
>  -semihosting  # current option name with existing semantics
>  -semihosting target=gdb
>  -semihosting target=native
>  -semihosting target=auto   # same as plain "-semihosting"

...and then my mail client sent that mail half-composed. The
missing fragment:

> something like (untested):
> static QemuOptsList qemu_semihosting_opts = {
>     .name = "semihosting",
>     .implied_opt_name = "enable",
>     .head = QTAILQ_HEAD_INITIALIZER(qemu_semihosting_opts.head),
>     .desc = {
>         {
>             .name = "enable",
>             .type = QEMU_OPT_BOOL,
>         },{
>             .name = "target",
>             .type = QEMU_OPT_STRING,
>         }
>         { /* end of list */ }
>     },
> };

[and if you don't specify target then we default to 'auto'.]

Compare the handling of 'rtc' and similar options: you get
to have an "implied option name" so "-foo" is treated like
"-foo enable=true", which gives us backwards compatibility
with our existing option, and a syntax for specifying the
target that fits in with the other command line options we
already have.

thanks
-- PMM