Kernel build issues with upstream binutils

Kernel build issues with upstream binutils

[Anton Blanchard]

Hi,

A recent binutils commit:

https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=1a9ccd70f9a75dc6b48d340059f28ef3550c107b

has broken kernel builds:

/home/anton/gcc.install/bin/ld: arch/powerpc/boot/zImage.pseries: Not enough room for program headers, try linking with -N
/home/anton/gcc.install/bin/ld: final link failed: Bad value

I guess we have an issue with our linker script.

Anton

Re: Kernel build issues with upstream binutils

[Nicholas Piggin]

On Sun, 27 Nov 2016 09:04:30 +1100
Anton Blanchard <anton@samba.org> wrote:

> Hi,
> 
> A recent binutils commit:
> 
> https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=1a9ccd70f9a75dc6b48d340059f28ef3550c107b
> 
> has broken kernel builds:
> 
> /home/anton/gcc.install/bin/ld: arch/powerpc/boot/zImage.pseries: Not enough room for program headers, try linking with -N
> /home/anton/gcc.install/bin/ld: final link failed: Bad value
> 
> I guess we have an issue with our linker script.

We may need something like this (not boot tested). I'll have a better look
tomorrow.

---
 arch/powerpc/boot/zImage.lds.S | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/boot/zImage.lds.S b/arch/powerpc/boot/zImage.lds.S
index 861e721..8963544 100644
--- a/arch/powerpc/boot/zImage.lds.S
+++ b/arch/powerpc/boot/zImage.lds.S
@@ -7,6 +7,13 @@ OUTPUT_ARCH(powerpc:common)
 #endif
 ENTRY(_zimage_start)
 EXTERN(_zimage_start)
+
+PHDRS
+{
+  text PT_LOAD FLAGS(5);          /* R_E */
+  data PT_LOAD FLAGS(6);          /* RW_ */
+}
+
 SECTIONS
 {
   .text      :
@@ -15,7 +22,7 @@ SECTIONS
     *(.text)
     *(.fixup)
     _etext = .;
-  }
+  } :text
   . = ALIGN(4096);
   .data    :
   {
@@ -25,7 +32,7 @@ SECTIONS
 #ifndef CONFIG_PPC64_BOOT_WRAPPER
     *(.got2)
 #endif
-  }
+  } :data
   .dynsym : { *(.dynsym) }
   .dynstr : { *(.dynstr) }
   .dynamic :
@@ -34,7 +41,6 @@ SECTIONS
     *(.dynamic)
   }
   .hash : { *(.hash) }
-  .interp : { *(.interp) }
   .rela.dyn :
   {
 #ifdef CONFIG_PPC64_BOOT_WRAPPER
@@ -86,4 +92,9 @@ SECTIONS
     *(COMMON)
     _end = . ;
   }
+
+  /DISCARD/ :
+  {
+    *(.interp)
+  }
 }
-- 
2.10.2

Re: Kernel build issues with upstream binutils

[Gustavo Romero]

Hi,

On bissecting kernel on Debian (gcc version 6.3.0 20170516) I've got the same
error on linking kernels <= v4.9 as reported previously in this thread:

ld: arch/powerpc/boot/zImage.pseries: Not enough room for program headers, try linking with -N
ld: final link failed: Bad value
arch/powerpc/boot/Makefile:364: recipe for target 'arch/powerpc/boot/zImage.pseries' failed
make[1]: *** [arch/powerpc/boot/zImage.pseries] Error 1
arch/powerpc/Makefile:278: recipe for target 'zImage' failed
make: *** [zImage] Error 2

Applying the fix proposed by Nicholas resolved the issue.

However that patch is not present - afaics - in > v4.9 (where it builds fine).

Any clue on why that is happening on <= v4.9 but not on kernels above that?

Thank you.


Regards,
Gustavo

Re: Kernel build issues with upstream binutils

[Gustavo Romero]

No sure if in reply-to took correct effect, so I'm posting the thread ref explicit:
https://lists.ozlabs.org/pipermail/linuxppc-dev/2016-November/151672.html

On 17-07-2017 09:57, Gustavo Romero wrote:
> Hi,
> 
> On bissecting kernel on Debian (gcc version 6.3.0 20170516) I've got the same
> error on linking kernels <= v4.9 as reported previously in this thread:
> 
> ld: arch/powerpc/boot/zImage.pseries: Not enough room for program headers, try linking with -N
> ld: final link failed: Bad value
> arch/powerpc/boot/Makefile:364: recipe for target 'arch/powerpc/boot/zImage.pseries' failed
> make[1]: *** [arch/powerpc/boot/zImage.pseries] Error 1
> arch/powerpc/Makefile:278: recipe for target 'zImage' failed
> make: *** [zImage] Error 2
> 
> Applying the fix proposed by Nicholas resolved the issue.
> 
> However that patch is not present - afaics - in > v4.9 (where it builds fine).
> 
> Any clue on why that is happening on <= v4.9 but not on kernels above that?
> 
> Thank you.
> 
> 
> Regards,
> Gustavo
>