Re: [Qemu-devel] [PATCH v9 02/27] gdbstub: Implement deatch (D pkt) with new infra

[Alex Bennée]

Jon Doron <address@hidden> writes:

> Signed-off-by: Jon Doron <address@hidden>
> ---
>  gdbstub.c | 90 ++++++++++++++++++++++++++++++-------------------------
>  1 file changed, 50 insertions(+), 40 deletions(-)
>
> diff --git a/gdbstub.c b/gdbstub.c
> index d5e0f3878a..621d689868 100644
> --- a/gdbstub.c
> +++ b/gdbstub.c
> @@ -1418,11 +1418,6 @@ static inline int startswith(const char *string, const 
> char *pattern)
>    return !strncmp(string, pattern, strlen(pattern));
>  }
>
> -static int process_string_cmd(
> -        GDBState *s, void *user_ctx, const char *data,
> -        const GdbCmdParseEntry *cmds, int num_cmds)
> -        __attribute__((unused));
> -
>  static int process_string_cmd(GDBState *s, void *user_ctx, const char *data,
>                                const GdbCmdParseEntry *cmds, int num_cmds)
>  {
> @@ -1468,6 +1463,41 @@ static int process_string_cmd(GDBState *s, void 
> *user_ctx, const char *data,
>      return -1;
>  }
>
> +static void handle_detach(GdbCmdContext *gdb_ctx, void *user_ctx)
> +{
> +    GDBProcess *process;
> +    GDBState *s = gdb_ctx->s;
> +    uint32_t pid = 1;
> +
> +    if (s->multiprocess) {
> +        if (!gdb_ctx->num_params) {
> +            put_packet(s, "E22");
> +            return;
> +        }
> +
> +        pid = gdb_ctx->params[0].val_ul;
> +    }
> +
> +    process = gdb_get_process(s, pid);
> +    gdb_process_breakpoint_remove_all(s, process);
> +    process->attached = false;
> +
> +    if (pid == gdb_get_cpu_pid(s, s->c_cpu)) {
> +        s->c_cpu = gdb_first_attached_cpu(s);
> +    }
> +
> +    if (pid == gdb_get_cpu_pid(s, s->g_cpu)) {
> +        s->g_cpu = gdb_first_attached_cpu(s);
> +    }
> +
> +    if (!s->c_cpu) {
> +        /* No more process attached */
> +        gdb_syscall_mode = GDB_SYS_DISABLED;
> +        gdb_continue(s);
> +    }
> +    put_packet(s, "OK");
> +}
> +
>  static int gdb_handle_packet(GDBState *s, const char *line_buf)
>  {
>      CPUState *cpu;
> @@ -1482,6 +1512,7 @@ static int gdb_handle_packet(GDBState *s, const char 
> *line_buf)
>      uint8_t *registers;
>      target_ulong addr, len;
>      GDBThreadIdKind thread_kind;
> +    const GdbCmdParseEntry *cmd_parser = NULL;
>
>      trace_gdbstub_io_command(line_buf);
>
> @@ -1582,42 +1613,15 @@ static int gdb_handle_packet(GDBState *s, const char 
> *line_buf)
>          error_report("QEMU: Terminated via GDBstub");
>          exit(0);
>      case 'D':
> -        /* Detach packet */
> -        pid = 1;
> -
> -        if (s->multiprocess) {
> -            unsigned long lpid;
> -            if (*p != ';') {
> -                put_packet(s, "E22");
> -                break;
> -            }
> -
> -            if (qemu_strtoul(p + 1, &p, 16, &lpid)) {
> -                put_packet(s, "E22");
> -                break;
> -            }
> -
> -            pid = lpid;
> -        }
> -
> -        process = gdb_get_process(s, pid);
> -        gdb_process_breakpoint_remove_all(s, process);
> -        process->attached = false;
> -
> -        if (pid == gdb_get_cpu_pid(s, s->c_cpu)) {
> -            s->c_cpu = gdb_first_attached_cpu(s);
> -        }
> -
> -        if (pid == gdb_get_cpu_pid(s, s->g_cpu)) {
> -            s->g_cpu = gdb_first_attached_cpu(s);
> -        }
> -
> -        if (s->c_cpu == NULL) {
> -            /* No more process attached */
> -            gdb_syscall_mode = GDB_SYS_DISABLED;
> -            gdb_continue(s);
> +        {
> +            static const GdbCmdParseEntry detach_cmd_desc = {
> +                .handler = handle_detach,
> +                .cmd = "D",
> +                .cmd_startswith = 1,
> +                .schema = "?.l0"
> +            };
> +            cmd_parser = &detach_cmd_desc;
>          }
> -        put_packet(s, "OK");
>          break;
>      case 's':
>          if (*p != '\0') {
> @@ -1990,6 +1994,12 @@ static int gdb_handle_packet(GDBState *s, const char 
> *line_buf)
>          put_packet(s, buf);
>          break;
>      }
> +
> +    if (cmd_parser &&
> +        process_string_cmd(s, NULL, line_buf, cmd_parser, 1)) {
> +        put_packet(s, "");

Why this null put_packet at the end? You've passed the handling of the
OK reply back to your handler so this seems superfluous.

--
Alex Bennée