gdbstub: Set gdb_set_stop_cpu() argument to CPUState

Use CPUState::env_ptr for now.

Prepares for changing cpu_handle_guest_debug() argument to CPUState.
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

cpus.c

@@ -463,7 +463,7 @@ static void cpu_handle_guest_debug(CPUArchState *env)
 {
     CPUState *cpu = ENV_GET_CPU(env);
 
-    gdb_set_stop_cpu(env);
+    gdb_set_stop_cpu(cpu);
     qemu_system_debug_request();
     cpu->stopped = true;
 }

gdbstub.c

@@ -2506,8 +2506,10 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
     return RS_IDLE;
 }
 
-void gdb_set_stop_cpu(CPUArchState *env)
+void gdb_set_stop_cpu(CPUState *cpu)
 {
+    CPUArchState *env = cpu->env_ptr;
+
     gdbserver_state->c_cpu = env;
     gdbserver_state->g_cpu = env;
 }

include/exec/gdbstub.h

@@ -16,7 +16,7 @@ typedef void (*gdb_syscall_complete_cb)(CPUArchState *env,
 
 void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...);
 int use_gdb_syscalls(void);
-void gdb_set_stop_cpu(CPUArchState *env);
+void gdb_set_stop_cpu(CPUState *cpu);
 void gdb_exit(CPUArchState *, int);
 #ifdef CONFIG_USER_ONLY
 int gdb_queuesig (void);