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RE: How to show instructions in one record
- From: "Metzger, Markus T" <markus dot t dot metzger at intel dot com>
- To: "mudongliangabcd at gmail dot com" <mudongliangabcd at gmail dot com>, "gdb at sourceware dot org" <gdb at sourceware dot org>
- Date: Tue, 6 Sep 2016 14:59:35 +0000
- Subject: RE: How to show instructions in one record
- Authentication-results: sourceware.org; auth=none
- References: <CAD-N9QV0vLTAmyo76HGZZYuToDZbOZzsrvDfmj535Wb8VWANvg@mail.gmail.com>
> -----Original Message-----
> From: email@example.com [mailto:firstname.lastname@example.org] On
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> Sent: Tuesday, September 6, 2016 4:14 PM
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> Subject: How to show instructions in one record
> I encounter the following problem when I show instructions in one record,
> (gdb) b main
> Breakpoint 1 at 0x80483f3: file simple.c, line 7.
> (gdb) r
> Starting program: /home/vagrant/simple/simple
> Breakpoint 1, main (argc=1, argv=0xbffff7a4) at simple.c:7
> 7 crash = buff;
> (gdb) record
> (gdb) c
> Program received signal SIGSEGV, Segmentation fault.
> 0x08048420 in main (argc=1, argv=0xbffff7a4) at simple.c:10
> 10 for (p=buff,q=argv;(*q);p++,q++)
> (gdb) record
> btrace full goto
> delete function-call-history instruction-history
> (gdb) record instruction-history
> You can't do that when your target is `record-full'
> Then I try "record-core", the same result.
> At last, I try "record-btrace", my system does not support branch tracing.
> So how to show instructions in one record?
The "record instruction-history" and "record function-call-history" commands
are only available for "record btrace" (and "record bts" and "record pt").
If you are using "record full" (or just "record"), you may use the "disassemble"
command to disassemble the current function and the "reverse-stepi" command
to step backwards through the recorded instructions.
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