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Re: [Qemu-devel] 答复: [RFC PATCH v5 10/13] gdbstub: allow reverse execut
From: |
Frederic Konrad |
Subject: |
Re: [Qemu-devel] 答复: [RFC PATCH v5 10/13] gdbstub: allow reverse execution in gdb stub. |
Date: |
Thu, 26 Jun 2014 09:39:46 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
On 26/06/2014 04:50, address@hidden wrote:
> Hi,
>
> Why not a gdb record support?
>
> Thanks!
> Li Guang
Hi,
Good idea.
We didn't think about that yet.
It might be done in a futur patch-set.
Thanks,
Fred
>> -----邮件原件-----
>> 发件人: address@hidden
>> [mailto:address@hidden 代表
>> address@hidden
>> 发送时间: 2014年6月25日 23:20
>> 收件人: address@hidden
>> 抄送: address@hidden; address@hidden;
>> address@hidden; address@hidden; address@hidden;
>> address@hidden; address@hidden; address@hidden
>> 主题: [Qemu-devel] [RFC PATCH v5 10/13] gdbstub: allow reverse execution in
>> gdb stub.
>>
>> 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 05/13] icount: check for icount clock deadline when cpu loop exits., (continued)
- [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, 2014/06/25
- Message not available
- Re: [Qemu-devel] 答复: [RFC PATCH v5 10/13] gdbstub: allow reverse execution in gdb stub.,
Frederic 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