From: Alex Bennée <alex.bennee@linaro.org>
Date: Fri, 1 Dec 2023 09:36:27 +0000 (+0000)
Subject: gdbstub: use a better signal when we halt for IO reasons
X-Git-Tag: pull-xen-20240312~135^2~4
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=5dcf6334ae1af158ec149794c3f35e459b98df5e;p=people%2Faperard%2Fqemu-dm.git

gdbstub: use a better signal when we halt for IO reasons

The gdb description GDB_SIGNAL_IO is "I/O possible" and by default gdb
will try and restart the guest, getting us nowhere. Report
GDB_SIGNAL_STOP instead which should at least halt the session at the
failure point.

Reviewed-by: Luis Machado <luis.machado@arm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231201093633.2551497-2-alex.bennee@linaro.org>
---

diff --git a/gdbstub/internals.h b/gdbstub/internals.h
index 465c24b36e..5c0c725e54 100644
--- a/gdbstub/internals.h
+++ b/gdbstub/internals.h
@@ -24,6 +24,7 @@ enum {
     GDB_SIGNAL_TRAP = 5,
     GDB_SIGNAL_ABRT = 6,
     GDB_SIGNAL_ALRM = 14,
+    GDB_SIGNAL_STOP = 17,
     GDB_SIGNAL_IO = 23,
     GDB_SIGNAL_XCPU = 24,
     GDB_SIGNAL_UNKNOWN = 143
diff --git a/gdbstub/system.c b/gdbstub/system.c
index 783ac140b9..83fd452800 100644
--- a/gdbstub/system.c
+++ b/gdbstub/system.c
@@ -183,7 +183,7 @@ static void gdb_vm_state_change(void *opaque, bool running, RunState state)
         break;
     case RUN_STATE_IO_ERROR:
         trace_gdbstub_hit_io_error();
-        ret = GDB_SIGNAL_IO;
+        ret = GDB_SIGNAL_STOP;
         break;
     case RUN_STATE_WATCHDOG:
         trace_gdbstub_hit_watchdog();