On Tue, Feb 21, 2012 at 06:11:54PM +0400, Kirill Yukhin wrote:
> As far as I undersand, correct one seems like that:
> .intel_syntax
> xbegin $0
> nop
>
> .att_syntax
> xbegin ($0)
> nop
>
> Which disassembles into:
> 0000000000000000 <.text>:
> 0: c7 f8 00 00 00 00 xbeginq 0x6
> 6: 90 nop
> 7: c7 f8 00 00 00 00 xbeginq 0xd
> d: 90 nop
Doesn't seem to do what you expect (nor xbegin $0 in Intel syntax):
$ /usr/src/binutils/obj/gas/as-new -o /tmp/a.o /tmp/a.s
$ cat /tmp/a.s
#.intel_syntax noprefix
nop
xbegin ($0)
nop
xbegin .+6
nop
$ /usr/src/binutils/obj/binutils/objdump -dr /tmp/a.o
/tmp/a.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <.text>:
0: 90 nop
1: c7 f8 00 00 00 00 xbeginq 0x7
3: R_X86_64_PC32 $0+0xfffffffffffffffc
7: 90 nop
8: c7 f8 00 00 00 00 xbeginq 0xe
e: 90 nop
Note the relocation in there, you don't want there any.
Jakub
