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From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug tdep/14673] New: esp isn't updated in stack unwind
Date: Fri, 05 Oct 2012 01:19:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14673

             Bug #: 14673
           Summary: esp isn't updated in stack unwind
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
        AssignedTo: unassigned@sourceware.org
        ReportedBy: hjl.tools@gmail.com
    Classification: Unclassified


For x86-64, esp isn't updated in stack unwind:

[hjl@gnu-tools-1 tmp]$ cat foo.c
void
bar ()
{
}

int
main ()
{
  bar ();
  return 0;
}
[hjl@gnu-tools-1 tmp]$ gcc -g foo.c
[hjl@gnu-tools-1 tmp]$ gdb a.out 
GNU gdb (GDB) 7.5.50.20120930-cvs
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /tmp/a.out...done.
(gdb) b bar
Breakpoint 1 at 0x4004a0: file foo.c, line 4.
(gdb) r
Starting program: /tmp/a.out 

Breakpoint 1, bar () at foo.c:4
4    }
(gdb) f 1
#1  0x00000000004004b0 in main () at foo.c:9
9      bar ();
(gdb) p $pc
$1 = (void (*)()) 0x4004b0 <main+14>
(gdb) p $rsp
$2 = (void *) 0x7fffffffdf90
(gdb) p $rip
$3 = (void (*)()) 0x4004b0 <main+14>
(gdb) p $sp
$4 = (void *) 0x7fffffffdf90
(gdb) p/x $esp
$5 = 0xffffdf80

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