http://sourceware.org/bugzilla/show_bug.cgi?id=13617
Bug #: 13617
Summary: gold's nop padding should contain only valid nop
instructions, not zeros
Product: binutils
Version: 2.23 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gold
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
This is related to http://sourceware.org/bugzilla/show_bug.cgi?id=13616 (a
BFD ld bug). In the same case, gold is trying to do the right thing. But
it's not quite right:
$ cat foo.s
.section code1,"ax",@progbits
.align 32
ret
$ ./gas/as-new -o pad.o pad.s
$ ./gold/ld-new -o gfoo foo.o foo.o
$ objdump -rd gfoo
gfoo: file format elf64-x86-64
Disassembly of section code1:
00000000004000c0 <code1>:
4000c0: c3 retq
4000c1: e9 1a 00 00 00 jmpq 4000e0 <__bss_start-0xf20>
...
4000de: 00 00 add %al,(%rax)
4000e0: c3 retq
$
Using a "jump around the gap" instruction for nop padding is fine in theory.
But the instructions inside the gap should be nops too, not zeros.
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