[U-Boot] relocation problem on powerpc
Joakim Tjernlund
joakim.tjernlund at transmode.se
Tue Sep 9 14:30:13 CEST 2014
> > Here's some more info from a build without any of my modifications.
> >
> > $ git describe
> > v2014.10-rc2-12-g0b703db
> >
> > $ powerpc-e500-linux-gnu-gcc --version
> > powerpc-e500-linux-gnu-gcc (Gentoo 4.6.3-r1 p1.9, pie-0.5.2) 4.6.3
> >
> > $ grep '_GOT2_TABLE_\|_GLOBAL_OFFSET_TABLE_\|__got2_entries'
u-boot.map
> > 0x00000000effb5100 _GOT2_TABLE_ = .
> > 0x00000000effb7d38 _GLOBAL_OFFSET_TABLE_
> > 0x00000000effb7d48 PROVIDE (_GLOBAL_OFFSET_TABLE_, (.
+ 0x4))
> > 0x0000000000000b0d __got2_entries =
> > (((_GLOBAL_OFFSET_TABLE_ - _GOT2_TABLE_) >> 0x2) - 0x1)
> >
> > $ gdb-multiarch u-boot
> > (gdb) disassemble /r 0xeffb5100,0xeffb7d48
> > Dump of assembler code from 0xeffb5100 to 0xeffb7d48:
> > 0xeffb5100 <_GOT2_TABLE_+0>: ef fb 51 00 .long 0xeffb5100
> > 0xeffb5104 <_GOT2_TABLE_+4>: ef fb 7d 44 dtstsf cr7,f27,f15
> > 0xeffb5108 <_GOT2_TABLE_+8>: ef f4 00 00 .long 0xeff40000
> > 0xeffb510c <_GOT2_TABLE_+12>: ef f4 01 00 .long
0xeff40100
> > <snip>
> > 0xeffb7d30 <_GOT2_TABLE_+11312>: ef f6 6e 74 .long
0xeff66e74
> > 0xeffb7d34 <_GOT2_TABLE_+11316>: f0 00 00 d0 psq_st
f0,208(r0),0,0
> > 0xeffb7d38 <_GLOBAL_OFFSET_TABLE_+0>: 00 00 00 00 .long
0x0
> > 0xeffb7d3c <_GLOBAL_OFFSET_TABLE_+4>: 00 00 00 00 .long
0x0
> > 0xeffb7d40 <_GLOBAL_OFFSET_TABLE_+8>: 00 00 00 00 .long
0x0
> > 0xeffb7d44 <_FIXUP_TABLE_+0>: ef fb 99 d4 .long
0xeffb99d4
> >
> > So no there is no brlr at the end of the table.
>
> There should be, see
http://www.freescale.com/files/32bit/doc/ref_manual/E500ABIUG.pdf, chap
4.3.2
So I did a quick test too with my copy of u-boot:
(gdb) disass /r 0x00000000effa0a48,0x00000000effa0a68
Dump of assembler code from 0xeffa0a48 to 0xeffa0a68:
0xeffa0a48 <_GOT2_TABLE_+9800>: f0 00 00 dc .long 0xf00000dc
0xeffa0a4c <_GOT2_TABLE_+9804>: ef f6 29 48 .long 0xeff62948
0xeffa0a50 <_GOT2_TABLE_+9808>: f0 00 00 e0 .long 0xf00000e0
0xeffa0a54 <_GOT2_TABLE_+9812>: 4e 80 00 21 blrl
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
0xeffa0a58 <_GLOBAL_OFFSET_TABLE_+0>: 00 00 00 00 .long 0x0
0xeffa0a5c <_GLOBAL_OFFSET_TABLE_+4>: 00 00 00 00 .long 0x0
0xeffa0a60 <_GLOBAL_OFFSET_TABLE_+8>: 00 00 00 00 .long 0x0
0xeffa0a64 <_FIXUP_TABLE_+0>: ef fa 23 1c .long 0xeffa231c
$ powerpc-softfloat_4.5.3-linux-gnu-ld --version
GNU ld (GNU Binutils) 2.21.1
I don't know it this is tool(ld) problem or if something in u-boot's build
env. Try dropping
--gc-sections, see if that changes anything, or add --bss-plt or similar
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