[Qemu-devel] [PATCH v1 2/8] target/avr: Add mechanism to check for active debugger connection

[Sarah Harris]

AVR CPUs have a BREAK instruction which behaves differently depending on 
whether debugging is enabled.
Since the hardware fuses that normally control this are difficult to emulate, 
and the BREAK instruction is useful for testing, the BREAK instruction is 
instead enabled/disabled depending on whether a GDB session is attached.

Signed-off-by: Sarah Harris <address@hidden>
---
 gdbstub.c              | 5 +++++
 include/exec/gdbstub.h | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/gdbstub.c b/gdbstub.c
index d54abd17cc..a254a364e6 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -1793,6 +1793,11 @@ static int gdb_handle_packet(GDBState *s, const char 
*line_buf)
     return RS_IDLE;
 }
 
+bool gdb_is_active(void)
+{
+    return gdbserver_state != NULL;
+}
+
 void gdb_set_stop_cpu(CPUState *cpu)
 {
     GDBProcess *p = gdb_get_cpu_process(gdbserver_state, cpu);
diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
index 08363969c1..d059bf5339 100644
--- a/include/exec/gdbstub.h
+++ b/include/exec/gdbstub.h
@@ -45,6 +45,10 @@ void gdb_do_syscall(gdb_syscall_complete_cb cb, const char 
*fmt, ...);
  */
 void gdb_do_syscallv(gdb_syscall_complete_cb cb, const char *fmt, va_list va);
 int use_gdb_syscalls(void);
+/**
+ * gdb_is_active: return true if debugging in progress
+ */
+bool gdb_is_active(void);
 void gdb_set_stop_cpu(CPUState *cpu);
 void gdb_exit(CPUArchState *, int);
 #ifdef CONFIG_USER_ONLY
-- 
2.21.0