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Re: [Qemu-devel] [PATCH v9 07/27] gdbstub: Implement insert breakpoint (


From: Alex Bennée
Subject: Re: [Qemu-devel] [PATCH v9 07/27] gdbstub: Implement insert breakpoint (Z pkt) with new infra
Date: Wed, 15 May 2019 11:26:02 +0100
User-agent: mu4e 1.3.1; emacs 26.1

Jon Doron <address@hidden> writes:

> Signed-off-by: Jon Doron <address@hidden>
> ---
>  gdbstub.c | 33 +++++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>
> diff --git a/gdbstub.c b/gdbstub.c
> index 21cdaf4678..36c7353a22 100644
> --- a/gdbstub.c
> +++ b/gdbstub.c
> @@ -1588,6 +1588,29 @@ static void handle_set_thread(GdbCmdContext *gdb_ctx, 
> void *user_ctx)
>      }
>  }
>
> +static void handle_insert_bp(GdbCmdContext *gdb_ctx, void *user_ctx)
> +{
> +    int res;
> +
> +    if (gdb_ctx->num_params < 3) {

!= 3?

> +        put_packet(gdb_ctx->s, "E22");
> +        return;
> +    }
> +
> +    res = gdb_breakpoint_insert(gdb_ctx->params[1].val_ull,
> +                                gdb_ctx->params[2].val_ull,
> +                                gdb_ctx->params[0].val_ul);

I would be tempted to fix the prototype of gdb_breakpoint_insert to
match the order of the packet parameters for cleanliness.

> +    if (res >= 0) {
> +        put_packet(gdb_ctx->s, "OK");
> +        return;
> +    } else if (res == -ENOSYS) {
> +        put_packet(gdb_ctx->s, "");
> +        return;
> +    }
> +
> +    put_packet(gdb_ctx->s, "E22");
> +}
> +
>  static int gdb_handle_packet(GDBState *s, const char *line_buf)
>  {
>      CPUState *cpu;
> @@ -1843,6 +1866,16 @@ static int gdb_handle_packet(GDBState *s, const char 
> *line_buf)
>          put_packet(s, "OK");
>          break;
>      case 'Z':
> +        {
> +            static const GdbCmdParseEntry insert_bp_cmd_desc = {
> +                .handler = handle_insert_bp,
> +                .cmd = "Z",
> +                .cmd_startswith = 1,
> +                .schema = "l?L?L0"
> +            };
> +            cmd_parser = &insert_bp_cmd_desc;
> +        }
> +        break;
>      case 'z':
>          type = strtoul(p, (char **)&p, 16);
>          if (*p == ',')

You should also delete the:

        if (ch == 'Z')
            res = gdb_breakpoint_insert(addr, len, type);
case.

In fact I think there is probably a good case just to merge with the
next patch as the two functions are very much related.

--
Alex Bennée



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