accel: Hold @can_reverse information in AccelGdbConfig

Hold @can_reverse in AccelGdbConfig, set it when initializing
AccelState in AccelClass::init_machine handlers (only TCG sets
it). Remove gdb_can_reverse() as now unused.

Signed-off-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Message-ID: <20260705215729.62196-17-philmd@oss.qualcomm.com>

gdbstub/gdbstub.c

@@ -1376,7 +1376,7 @@ static void handle_step(GArray *params, void *user_ctx)
 
 static void handle_backward(GArray *params, void *user_ctx)
 {
-    if (!gdb_can_reverse()) {
+    if (!gdbserver_state.accel_config.can_reverse) {
         gdb_put_packet("E22");
         return;
     }
@@ -1684,7 +1684,7 @@ static void handle_query_supported(GArray *params, void *user_ctx)
         g_string_append(gdbserver_state.str_buf, ";qXfer:features:read+");
     }
 
-    if (gdb_can_reverse()) {
+    if (gdbserver_state.accel_config.can_reverse) {
         g_string_append(gdbserver_state.str_buf,
             ";ReverseStep+;ReverseContinue+");
     }

gdbstub/internals.h

@@ -154,7 +154,6 @@ CPUState *gdb_first_attached_cpu(void);
 void gdb_append_thread_id(CPUState *cpu, GString *buf);
 int gdb_get_cpu_index(CPUState *cpu);
 unsigned int gdb_get_max_cpus(void); /* both */
-bool gdb_can_reverse(void); /* system emulation, stub for user */
 int gdb_target_sigtrap(void); /* user */
 
 void gdb_create_default_process(GDBState *s);

gdbstub/system.c

@@ -479,11 +479,6 @@ unsigned int gdb_get_max_cpus(void)
     return ms->smp.max_cpus;
 }
 
-bool gdb_can_reverse(void)
-{
-    return replay_mode == REPLAY_MODE_PLAY;
-}
-
 /*
  * Softmmu specific command helpers
  */

gdbstub/user.c

@@ -786,12 +786,6 @@ unsigned int gdb_get_max_cpus(void)
     return max_cpus;
 }
 
-/* replay not supported for user-mode */
-bool gdb_can_reverse(void)
-{
-    return false;
-}
-
 /*
  * Break/Watch point helpers
  */