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[Qemu-devel] [RFC PATCH v5 10/13] gdbstub: allow reverse execution in gd
From: |
fred . konrad |
Subject: |
[Qemu-devel] [RFC PATCH v5 10/13] gdbstub: allow reverse execution in gdb stub. |
Date: |
Wed, 25 Jun 2014 17:20:04 +0200 |
From: KONRAD Frederic <address@hidden>
This allows gdb to reverse step QEMU: reverse-stepi and reverse-cont commands
are allowed.
When step_backward is called, QEMU restores a snapshot before the actual
instruction and stops (with a debug exit) when the previous instruction is
reached.
Signed-off-by: KONRAD Frederic <address@hidden>
---
gdbstub.c | 31 ++++++++++++++++++++++++++++++-
1 file changed, 30 insertions(+), 1 deletion(-)
diff --git a/gdbstub.c b/gdbstub.c
index 8afe0b7..99769af 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -33,6 +33,7 @@
#include "sysemu/char.h"
#include "sysemu/sysemu.h"
#include "exec/gdbstub.h"
+#include "reverse-execution.h"
#endif
#define MAX_PACKET_LENGTH 4096
@@ -1113,6 +1114,17 @@ static int gdb_handle_packet(GDBState *s, const char
*line_buf)
if (cc->gdb_core_xml_file != NULL) {
pstrcat(buf, sizeof(buf), ";qXfer:features:read+");
}
+
+ #ifndef CONFIG_USER_ONLY
+ /*
+ * When reverse execution is enabled those additional features must
+ * be set so GDB allows reverse-stepi and reverse-continue command.
+ */
+ if (cexe_is_enabled()) {
+ pstrcat(buf, sizeof(buf), ";ReverseStep+;ReverseContinue+");
+ }
+ #endif /* !CONFIG_USER_ONLY */
+
put_packet(s, buf);
break;
}
@@ -1161,7 +1173,23 @@ static int gdb_handle_packet(GDBState *s, const char
*line_buf)
}
/* Unrecognised 'q' command. */
goto unknown_command;
-
+ #ifndef CONFIG_USER_ONLY
+ case 'b':
+ /* Reverse execution. */
+ switch (*p) {
+ case 's':
+ cexe_step_backward(s->c_cpu, 1);
+ break;
+ case 'c':
+ cexe_continue_backward(s->c_cpu);
+ break;
+ default:
+ buf[0] = '\0';
+ put_packet(s, buf);
+ break;
+ }
+ break;
+ #endif /* !CONFIG_USER_ONLY */
default:
unknown_command:
/* put empty packet */
@@ -1221,6 +1249,7 @@ static void gdb_vm_state_change(void *opaque, int
running, RunState state)
ret = GDB_SIGNAL_TRAP;
break;
case RUN_STATE_PAUSED:
+ cexe_stop_reverse_continue();
ret = GDB_SIGNAL_INT;
break;
case RUN_STATE_SHUTDOWN:
--
1.9.0
- [Qemu-devel] [RFC PATCH v5 04/13] icount: introduce icount timer., (continued)
- [Qemu-devel] [RFC PATCH v5 04/13] icount: introduce icount timer., fred . konrad, 2014/06/25
- [Qemu-devel] [RFC PATCH v5 05/13] icount: check for icount clock deadline when cpu loop exits., fred . konrad, 2014/06/25
- [Qemu-devel] [RFC PATCH v5 03/13] migration: make qemu_savevm_state public., fred . konrad, 2014/06/25
- [Qemu-devel] [RFC PATCH v5 07/13] timer: add cpu_icount_to_ns function., fred . konrad, 2014/06/25
- [Qemu-devel] [RFC PATCH v5 06/13] icount: make icount extra computed on icount clock as well., fred . konrad, 2014/06/25
- [Qemu-devel] [RFC PATCH v5 02/13] migration: migrate icount fields., fred . konrad, 2014/06/25
- [Qemu-devel] [RFC PATCH v5 09/13] introduce reverse execution mechanism., fred . konrad, 2014/06/25
[Qemu-devel] [RFC PATCH v5 10/13] gdbstub: allow reverse execution in gdb stub.,
fred . konrad <=
[Qemu-devel] [RFC PATCH v5 12/13] cexe: synchronize icount on the next event., fred . konrad, 2014/06/25
[Qemu-devel] [RFC PATCH v5 08/13] trace-events: add reverse-execution events., fred . konrad, 2014/06/25
[Qemu-devel] [RFC PATCH v5 11/13] cpu-exec: trigger a debug request when rexec stops., fred . konrad, 2014/06/25
[Qemu-devel] [RFC PATCH v5 13/13] cexe: allow to enable reverse execution., fred . konrad, 2014/06/25
Re: [Qemu-devel] [RFC PATCH v5 00/13] Reverse execution., Paolo Bonzini, 2014/06/25