powerpc/ppc64: Allow allmodconfig to build (finally !)

Stephen Rothwell sfr at canb.auug.org.au
Wed May 14 13:34:34 EST 2014


Hi Guenter,

On Tue, 13 May 2014 10:17:49 -0700 Guenter Roeck <linux at roeck-us.net> wrote:
>
> On Tue, May 13, 2014 at 07:16:41PM +1000, Benjamin Herrenschmidt wrote:
> > On Mon, 2014-05-12 at 17:28 -0700, Guenter Roeck wrote:
> > 
> > > After applying this patch, I get
> > > 
> > > arch/powerpc/kernel/exceptions-64s.S:269: Error: operand out of range
> > > (0x000000000000814c is not between 0xffffffffffff8000 and 0x0000000000007ffc)
> > > arch/powerpc/kernel/exceptions-64s.S:729: Error: operand out of range
> > > (0x000000000000814c is not between 0xffffffffffff8000 and 0x0000000000007ffc)
> > > 
> > > with powerpc:defconfig, powerpc:allmodconfig, powerpc:cell_defconfig, and
> > > powerpc:maple_defconfig.
> > > 
> > > This is on top of v3.15-rc5. Any idea what is going on ?
> > > 
> > > Compiler is powerpc64-poky-linux-gcc (GCC) 4.7.2 (from poky 1.4.0-1).
> > 
> > Interesting... works with all my test configs using 4.7.3...
> > 
> > I don't have my tree at hand right now, I'll check what that means
> > tomorrow see if I can find a workaround.
> > 
> It works for me with gcc 4.8.2 (build from yocto 1.6.0).
> 
> Is asking people to use gcc 4.7.3 or later acceptable ?

OK, this appears to be an assembler bug.

$ cat test.s
	.text
x:
	.pushsection	b, "a"
	beq y
	.popsection
	.=0x80000
y:
$ /opt/cross/gcc-4.6.3-nolibc/powerpc64-linux/bin/powerpc64-linux-as --version
GNU assembler (GNU Binutils) 2.22
This assembler was configured for a target of `powerpc64-linux'.
$ /opt/cross/gcc-4.6.3-nolibc/powerpc64-linux/bin/powerpc64-linux-as -o test.o test.s 
test.s: Assembler messages:
test.s:4: Error: operand out of range (0x0000000000080000 is not between 0xffffffffffff8000 and 0x0000000000007ffc)
$ /opt/cross/gcc-4.8.1-nolibc/powerpc64-linux/bin/powerpc64-linux-as --version
GNU assembler (GNU Binutils) 2.23.52.20130512
This assembler was configured for a target of `powerpc64-linux'.
$ /opt/cross/gcc-4.8.1-nolibc/powerpc64-linux/bin/powerpc64-linux-as -o test.o test.s 
(no error)

Alan, can you shed light on when it was fixed?

-- 
Cheers,
Stephen Rothwell                    sfr at canb.auug.org.au
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 836 bytes
Desc: not available
URL: <http://lists.ozlabs.org/pipermail/linuxppc-dev/attachments/20140514/430d5c05/attachment.sig>


More information about the Linuxppc-dev mailing list