* Does gdb understand copy relocation?
@ 2005-08-07 15:12 H. J. Lu
2005-08-07 19:09 ` Daniel Jacobowitz
0 siblings, 1 reply; 3+ messages in thread
From: H. J. Lu @ 2005-08-07 15:12 UTC (permalink / raw)
To: GDB
On targets with copy relocation, when executable references a data
symbol defined in DSO, a copy relocation will be used to copy the
definition from DSO to executable and the copy in executable will be
used by the process. But gdb I am using insists using the one in DSO.
Is there a way to teach gdb about copy relocation?
H.J.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Does gdb understand copy relocation?
2005-08-07 15:12 Does gdb understand copy relocation? H. J. Lu
@ 2005-08-07 19:09 ` Daniel Jacobowitz
2005-08-07 20:01 ` H. J. Lu
0 siblings, 1 reply; 3+ messages in thread
From: Daniel Jacobowitz @ 2005-08-07 19:09 UTC (permalink / raw)
To: H. J. Lu; +Cc: GDB
On Sun, Aug 07, 2005 at 08:12:16AM -0700, H. J. Lu wrote:
> On targets with copy relocation, when executable references a data
> symbol defined in DSO, a copy relocation will be used to copy the
> definition from DSO to executable and the copy in executable will be
> used by the process. But gdb I am using insists using the one in DSO.
> Is there a way to teach gdb about copy relocation?
GDB does not know anything about symbol resolution at all. It also
does not use the relocations for much of anything, just the symbol
tables.
I would have expected it to prefer the copy in the executable. I'm a
bit surprised if it didn't.
--
Daniel Jacobowitz
CodeSourcery, LLC
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Does gdb understand copy relocation?
2005-08-07 19:09 ` Daniel Jacobowitz
@ 2005-08-07 20:01 ` H. J. Lu
0 siblings, 0 replies; 3+ messages in thread
From: H. J. Lu @ 2005-08-07 20:01 UTC (permalink / raw)
To: GDB
On Sun, Aug 07, 2005 at 03:08:59PM -0400, Daniel Jacobowitz wrote:
> On Sun, Aug 07, 2005 at 08:12:16AM -0700, H. J. Lu wrote:
> > On targets with copy relocation, when executable references a data
> > symbol defined in DSO, a copy relocation will be used to copy the
> > definition from DSO to executable and the copy in executable will be
> > used by the process. But gdb I am using insists using the one in DSO.
> > Is there a way to teach gdb about copy relocation?
>
> GDB does not know anything about symbol resolution at all. It also
> does not use the relocations for much of anything, just the symbol
> tables.
>
> I would have expected it to prefer the copy in the executable. I'm a
> bit surprised if it didn't.
There is no DW_AT_location for copy relocated symbol. But the symbol
tables have
84: 080ebbd0 4 OBJECT GLOBAL DEFAULT 24 optarg@GLIBC_2.0
(2)
2297: 080ebbd0 4 OBJECT GLOBAL DEFAULT 24 optarg@@GLIBC_2.0
If I strip the binary, gdb seems to know the location of optarg. I
think gdb should consult symbol tables in executable if the debug
info doesn't have DW_AT_location.
H.J.
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2005-08-07 19:09 ` Daniel Jacobowitz
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