http://sourceware.org/bugzilla/show_bug.cgi?id=15370
Bug #: 15370
Summary: linker script does not group sections correctly when
building ppc64 Linux kernel
Product: binutils
Version: 2.24 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gold
AssignedTo: i...@airs.com
ReportedBy: an...@samba.org
CC: ccout...@google.com
Classification: Unclassified
Created attachment 6987
--> http://sourceware.org/bugzilla/attachment.cgi?id=6987
Testcase
We see a failure when building the ppc64 Linux kernel. We require __ftr_alt
sections to be placed directly after the object's text section and have the
following in our linker script:
.text :
{
*(.text __ftr_alt_*)
}
The __ftr_alt sections contain instructions that we relocate and copy over the
kernel as a part of our runtime patching code.
On the bfd linker this works, but on gold all the __ftr_alt sections are placed
at the end of the text section. When this happens conditional branches cannot
be relocated and the kernel panics.
The attached testcase shows this behaviour, ld.bfd behaves as expected by
ld.gold fails:
# ./testcase
test: file format elf64-powerpc
Disassembly of section .text:
0000000000000000 <_start>:
0: 60 21 00 01 ori r1,r1,1
4: 60 42 00 02 ori r2,r2,2
8: 60 63 00 03 ori r3,r3,3
c: 60 84 00 04 ori r4,r4,4
10: 60 a5 00 05 ori r5,r5,5
14: 60 c6 00 06 ori r6,r6,6
test: file format elf64-powerpc
Disassembly of section .text:
0000000000000024 <_start>:
24: 60 21 00 01 ori r1,r1,1
28: 60 42 00 02 ori r2,r2,2
2c: 60 84 00 04 ori r4,r4,4
30: 60 a5 00 05 ori r5,r5,5
34: 60 63 00 03 ori r3,r3,3
38: 60 c6 00 06 ori r6,r6,6
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