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Re: [PATCH][ARM] Fix handling of GOT_PREL in gas.
On Thu, Sep 16, 2010 at 10:24:57AM +0100, Richard Earnshaw wrote:
> On Thu, 2010-09-16 at 01:44 -0700, Doug Kwan (éæå) wrote:
> > Hi
> >
> > This patch fixes a problem in which gas fails to assemble data
> > expression in the form:
> >
> > symbol(GOT_PREL) + (. - (.LPIC0 + 4))
> >
> > where .LPIC0 is a local label defined in the same function after the
> > data expression. Currently, LPIC0 is undefined when the data
> > expression is processed and that causes an error in the function
> > expr() because the two operands of the addition have different
> > segments.
[snip]
>
> This really sounds to me like something that should be handled in a more
> generic way than a special-case hack in the back-end.
Other targets don't have a problem assembling expressions like this.
$ cat /src/tmp/fwdexp.s
.text
.long i + (. - (.LPIC0+4))
.long 0
.LPIC0:
$ gas/as-new /src/tmp/fwdexp.s
$ binutils/objdump -dr a.out
a.out: file format elf32-powerpc
Disassembly of section .text:
00000000 <.text>:
0: ff ff ff f4 .long 0xfffffff4
0: R_PPC_ADDR32 i+0xfffffff4
4: 00 00 00 00 .long 0x0
--
Alan Modra
Australia Development Lab, IBM