Re: [Qemu-devel] [PATCH v6 09/16] gdbstub: add multiprocess support to gdb_vm_state_change()

["Edgar E. Iglesias" <edgar.iglesias@xilinx.com>]

On Thu, Nov 15, 2018 at 10:42:00AM +0100, Luc Michel wrote:
> Add support for multiprocess extension in gdb_vm_state_change()
> function.
> 
> Signed-off-by: Luc Michel <luc.michel@greensocs.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>


> ---
>  gdbstub.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/gdbstub.c b/gdbstub.c
> index 4cbc81ae5b..5df9929f92 100644
> --- a/gdbstub.c
> +++ b/gdbstub.c
> @@ -1713,10 +1713,11 @@ void gdb_set_stop_cpu(CPUState *cpu)
>  static void gdb_vm_state_change(void *opaque, int running, RunState state)
>  {
>      GDBState *s = gdbserver_state;
>      CPUState *cpu = s->c_cpu;
>      char buf[256];
> +    char thread_id[16];
>      const char *type;
>      int ret;
>  
>      if (running || s->state == RS_INACTIVE) {
>          return;
> @@ -1724,10 +1725,18 @@ static void gdb_vm_state_change(void *opaque, int running, RunState state)
>      /* Is there a GDB syscall waiting to be sent?  */
>      if (s->current_syscall_cb) {
>          put_packet(s, s->syscall_buf);
>          return;
>      }
> +
> +    if (cpu == NULL) {
> +        /* No process attached */
> +        return;
> +    }
> +
> +    gdb_fmt_thread_id(s, cpu, thread_id, sizeof(thread_id));
> +
>      switch (state) {
>      case RUN_STATE_DEBUG:
>          if (cpu->watchpoint_hit) {
>              switch (cpu->watchpoint_hit->flags & BP_MEM_ACCESS) {
>              case BP_MEM_READ:
> @@ -1741,12 +1750,12 @@ static void gdb_vm_state_change(void *opaque, int running, RunState state)
>                  break;
>              }
>              trace_gdbstub_hit_watchpoint(type, cpu_gdb_index(cpu),
>                      (target_ulong)cpu->watchpoint_hit->vaddr);
>              snprintf(buf, sizeof(buf),
> -                     "T%02xthread:%02x;%swatch:" TARGET_FMT_lx ";",
> -                     GDB_SIGNAL_TRAP, cpu_gdb_index(cpu), type,
> +                     "T%02xthread:%s;%swatch:" TARGET_FMT_lx ";",
> +                     GDB_SIGNAL_TRAP, thread_id, type,
>                       (target_ulong)cpu->watchpoint_hit->vaddr);
>              cpu->watchpoint_hit = NULL;
>              goto send_packet;
>          } else {
>              trace_gdbstub_hit_break();
> @@ -1784,11 +1793,11 @@ static void gdb_vm_state_change(void *opaque, int running, RunState state)
>          trace_gdbstub_hit_unknown(state);
>          ret = GDB_SIGNAL_UNKNOWN;
>          break;
>      }
>      gdb_set_stop_cpu(cpu);
> -    snprintf(buf, sizeof(buf), "T%02xthread:%02x;", ret, cpu_gdb_index(cpu));
> +    snprintf(buf, sizeof(buf), "T%02xthread:%s;", ret, thread_id);
>  
>  send_packet:
>      put_packet(s, buf);
>  
>      /* disable single step if it was enabled */
> -- 
> 2.19.1
>