PATCH: Add R_386_SIZE32/R_X86_64_SIZE32/R_X86_64_SIZE64 support to bfd

[H.J. Lu]

On Wed, Jan 16, 2013 at 3:57 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Wed, Jan 16, 2013 at 3:50 PM, David Miller <davem@davemloft.net> wrote:
>>
>> H.J. I wonder about this syntax.
>>
>> Won't it conflict with symbol versioning?
>>
>> How could we refer in the assembler to a specific version of
>> a symbol, and that version happens to be "SIZE"?
>>
>> Maybe I'm concerned about a non-issue, but I thought I'd ask.
>
> The same applies to @PLT, @GOT, @GOTOFF, ....
> I don't think it is a real issue.
>

[hjl@gnu-6 sized-tls]$ cat v.S
	.globl old_foo
	.symver old_foo, foo@SIZE
old_foo:
	movl $foo@SIZE,%eax
[hjl@gnu-6 sized-tls]$ ./as -o v.o v.S
[hjl@gnu-6 sized-tls]$ ./objdump -drw v.o

v.o:     file format elf64-x86-64


Disassembly of section .text:

0000000000000000 <foo@SIZE>:
   0:	b8 00 00 00 00       	mov    $0x0,%eax	1: R_X86_64_SIZE32	foo
[hjl@gnu-6 sized-tls]$ ./readelf -sW v.o

Symbol table '.symtab' contains 7 entries:
   Num:    Value          Size Type    Bind   Vis      Ndx Name
     0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND
     1: 0000000000000000     0 SECTION LOCAL  DEFAULT    1
     2: 0000000000000000     0 SECTION LOCAL  DEFAULT    3
     3: 0000000000000000     0 SECTION LOCAL  DEFAULT    4
     4: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT    1 old_foo
     5: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND foo
     6: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT    1 foo@SIZE
[hjl@gnu-6 sized-tls]$



-- 
H.J.