'maybe_software_singlestep' inserts breakpoints when record replay

'maybe_software_singlestep' inserts breakpoints when record replay

[Xingxing Pan]

Hi guys,

I'm porting the process record to an arch which only supports software
singlestep.

And I found that in the function 'resume', the function
'maybe_software_singlestep' inserts a software singlestep breakpoint
although the inferior is in record replay, and return a zero value to
the variable 'step'. When I use the command 'reverse-stepi',  gdb
cannot stop after reversely executing one instruction .

I try to prevent 'maybe_software_singlestep' from inserting a software
singlestep breakpoint when 'RECORD_IS_REPLAY' is asserted. Then the
error is disappeared.

I cannot figure out why we need to insert a software singlestep
breakpoint when gdb is travelling along the record_list back and
forth. Is this a bug?

Thanks,
Pan Xingxing

Re: 'maybe_software_singlestep' inserts breakpoints when record replay

[Hui Zhu]

Are you work in trunk?

I remember I check in a patch to fix this issue before 7.2 release.

Thanks,
Hui

On Tue, Nov 9, 2010 at 23:40, Xingxing Pan <forandom@gmail.com> wrote:
> Hi guys,
>
> I'm porting the process record to an arch which only supports software
> singlestep.
>
> And I found that in the function 'resume', the function
> 'maybe_software_singlestep' inserts a software singlestep breakpoint
> although the inferior is in record replay, and return a zero value to
> the variable 'step'. When I use the command 'reverse-stepi',  gdb
> cannot stop after reversely executing one instruction .
>
> I try to prevent 'maybe_software_singlestep' from inserting a software
> singlestep breakpoint when 'RECORD_IS_REPLAY' is asserted. Then the
> error is disappeared.
>
> I cannot figure out why we need to insert a software singlestep
> breakpoint when gdb is travelling along the record_list back and
> forth. Is this a bug?
>
> Thanks,
> Pan Xingxing
>