Re: ld relocate symbols(in small common section) to a unaligned address.(on mips r3000 target)

[zhigang gong]

sorry i forgot to attach the file. Now attach the tar ball.

On 9/8/05, zhigang gong <address@hidden> wrote:
> Hi Nick,
> 
>          Tanks for you reply so soonly. I had already download the
> latest snapshot(binutils-050907), and the problem has not resolve
> yet.I try to make the case smaller, but i failed. As when I make some
> modification ,the problem will not exist any more. I have to send you
> a little big test case(less than 1Mbytes tarball). Really appreciate
> for your kindly help.
> 
> Here is the readme file of the test case tarball, which you will find
> in it also.
> 
> LD version 2.16.1 or binutils-050907, configuration is
> ./configure --target=mipsel-elf
> 
> Now invoke the make in the current directory. There will generat three
> files.
> symbol.list
>                  This file is the libextras.a's  symbol list,and you
> can search "piofree_handle" in it.
>                  You will find the follow statements:
>                                      86: 00000004    28 OBJECT  GLOBAL
> DEFAULT  COM piofree_intr
>                                      87: 00000004     4 OBJECT  GLOBAL
> DEFAULT  COM piofree_handle
>                                      88: 00000000     0 NOTYPE  GLOBAL
> DEFAULT  UND cyg_interrupt_create
>                  It's clearly that the aligment of piofree_handle is 4
> bytes aligned.
> 
> thread_gdb
>                  This file is the output elf image(excecuable).
> 
> 
> thread_gdb.map
>                  This file is the output elf image's map file, and you
> can search "piofree_handle"  too.
>                  You will get the follow statements:
>                                      .scommon       0x000000008090bc44
>        0x9 thread_gdb.o
>                                      0x000000008090bc44               
> worker_cv
>                                      0x000000008090bc4c               
> worker_state
>                                      .scommon       0x000000008090bc4d
>        0xc extras.o
>                                      0x000000008090bc4d               
> piofree_handle
>                                      0x000000008090bc51               
> flag_int_reason
>                                      *fill*         0x000000008090bc59
>        0x3 00
>                  Now you will find the problem is that the
> piofree_handle is misaligned.When excute the image in my
>                  platform, there will raise unaligned access exception.
> 
> Best Regars,
> Zhigang.
> 
> On 9/7/05, Nick Clifton <address@hidden> wrote:
> > Hi Zhigang,
> > 
> > > /home/zhigang/0808/pattern_install/lib/extras.o
> > >                 0x000000008090bc4d                
> > > piofree_handle                          ------Please see here, the 
> > > address is not correct aligned
> > 
> > >                 .comm   piofree_handle,4,4    (the alignment is right)
> > 
> > This does indeed appear to be a bug in the linker.  Are you able to 
> > create a *small* test case which reproduces this problem ?  With that we 
> > could investigate it and try to fix it.
> > 
> > Oh - one other thing you could try is to download the current binutils 
> > sources from the mainline of the CVS repository and build a new linker. 
> >   Several rather subtle and nasty linker bugs have been fixed recently 
> > and your problem might be one of those fixed bugs.
> > 
> > Cheers
> >    Nick
> > 
> > 
> >
>

ld_pattern.tar.bz2
Description: BZip2 compressed data