Re: binutils 2.19 issue with kernel link

[Kumar Gala]

On Jul 8, 2009, at 6:39 PM, Alan Modra wrote:

> On Wed, Jul 08, 2009 at 05:41:39PM -0500, Kumar Gala wrote:
> > If we modify the linker script:
> >
> >      _end2 = .;
> >      _end3 = ALIGN(4096);
> >      _end4 = ALIGN(PAGE_SIZE);
> >      . = ALIGN(PAGE_SIZE);
> >      _end = . ;
> >      PROVIDE32 (end = .);
> >
> > and the result is:
> >
> > 00001000 A _end
> > c067f678 A _end2
> > c0680000 A _end3
> > c0680000 A _end4
>
> Possibly some section with a zero vma is being placed before _end.
> Generate a link map to see if this is so.

In the broken (ALIGN) case we have:

 .bss           0x00000000c05d3018        0x0 lib/lib.a(klist.o)
 .bss           0x00000000c05d3018        0x0 lib/lib.a(sha1.o)
 .bss           0x00000000c05d3018        0x0 .tmp_kallsyms3.o
 *(COMMON)
                0x00000000c05d3018                __bss_stop = .

.PPC.EMB.apuinfo
                0x0000000000000000       0x24
 .PPC.EMB.apuinfo
                0x0000000000000000       0x1c arch/powerpc/kernel/ 
head_fsl_booke.o
 .PPC.EMB.apuinfo

In the non-ALIGN case we have:

                0x00000000c05d3018                _end = .
                0x00000000c05d3018                PROVIDE (end, .)
LOAD arch/powerpc/kernel/head_fsl_booke.o
LOAD init/built-in.o
START GROUP
LOAD usr/built-in.o
LOAD arch/powerpc/kernel/built-in.o
LOAD arch/powerpc/mm/built-in.o
LOAD arch/powerpc/lib/built-in.o
LOAD arch/powerpc/sysdev/built-in.o
LOAD arch/powerpc/platforms/built-in.o
LOAD arch/powerpc/math-emu/built-in.o
LOAD kernel/built-in.o
LOAD mm/built-in.o
LOAD fs/built-in.o
LOAD ipc/built-in.o
LOAD security/built-in.o
LOAD crypto/built-in.o
LOAD block/built-in.o
LOAD lib/lib.a
LOAD lib/built-in.o
LOAD drivers/built-in.o
LOAD sound/built-in.o
LOAD firmware/built-in.o
LOAD net/built-in.o
END GROUP
LOAD .tmp_kallsyms3.o
OUTPUT(vmlinux elf32-powerpc)

.PPC.EMB.apuinfo
                0x0000000000000000       0x24
 .PPC.EMB.apuinfo
                0x0000000000000000       0x1c arch/powerpc/kernel/ 
head_fsl_booke.o