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Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- From: Michael Matz <matz at suse dot de>
- To: "H.J. Lu" <hjl dot tools at gmail dot com>
- Cc: Jan Beulich <JBeulich at suse dot com>, Binutils <binutils at sourceware dot org>
- Date: Tue, 12 May 2015 15:49:00 +0200 (CEST)
- Subject: Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Authentication-results: sourceware.org; auth=none
- References: <20150511212331 dot GA1838 at intel dot com> <5551F4E70200007800079575 at mail dot emea dot novell dot com> <CAMe9rOpDbkeFbmNbQh0a1AKhAQy-cH4HJu20o_ERQaoR6sTxbQ at mail dot gmail dot com> <55520C440200007800079718 at mail dot emea dot novell dot com> <CAMe9rOpFgSyJm-oceuDkrBYnBQGv01ywCc43WySqX21NTJYi4Q at mail dot gmail dot com> <555216370200007800079773 at mail dot emea dot novell dot com> <CAMe9rOpOx=SSUZnCFimn4fBzFqNRDch8QYLn3Os_y7EfQH65Qw at mail dot gmail dot com>
Hi,
On Tue, 12 May 2015, H.J. Lu wrote:
> This is what I got now:
>
> [hjl@gnu-6 tmp]$ cat x.s
> .text
> data16 jmp foo
> bar:
> mov %eax,%edx
> [hjl@gnu-6 tmp]$ gcc -c x.s
> [hjl@gnu-6 tmp]$ objdump -dwr x.o
>
> x.o: file format elf64-x86-64
>
>
> Disassembly of section .text:
>
> 0000000000000000 <bar-0x4>:
> 0: 66 e9 00 00 89 c2 data16 jmpq ffffffffc2890006
> <bar+0xffffffffc2890002> 2: R_X86_64_PC16 foo-0x2
>
> 0000000000000004 <bar>:
> 4: 89 c2 mov %eax,%edx
> [hjl@gnu-6 tmp]$
>
> Is that the same as what you got with binutils 2.25?
This is with 2.23, so your patch would cause a regression:
x.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <bar-0x4>:
0: 66 e9 00 00 jmpw 4 <bar>
2: R_X86_64_PC16 foo-0x2
0000000000000004 <bar>:
4: 89 c2 mov %eax,%edx
Ciao,
Michael.