This is the mail archive of the mailing list for the binutils project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Global symbol prefixes

On 03/28/2013 07:34 PM, Jan Tlatlik wrote:
> On 03/28/2013 07:29 PM, Mike Frysinger wrote:
>> On Thursday 28 March 2013 12:36:48 Jan Tlatlik wrote:
>>> Hey there,
>>> I need a few directions:
>>> I'm porting GAS to my architecture and I'm stuck with global symbol
>>> prefixes.
>>> Since my register operands are not prefixed (e.g. r23 instead of  %r23),
>>> I need to prefix global symbols to avoid name collisions.
>>> How do I tell GAS to recognize this prefix?
>>> If I try to assemble
>>>     .global %main
>>> %main:
>>>     [...]
>>> I am getting errors like
>>>> example.s:1: Error: expected symbol name
>>>> example.s:2: Error: junk at end of line, first unrecognized character
>>> is `%'
>>> The symbol names in the object file though must not have the prefix. It
>>> is only needed at assembly time to solve the name collision problem.
>>> I looked through a few existing ports, but none of them seem to do it
>>> this way. Could anyone give me some advice how to do that?
>> [...]
>> alternatively, change the assembly syntax to disambiguate the register names 
>> (and use $r23 instead of r23).
>> -mike
> I suppose this would be way with the least effort to solve the problem.
> Thanks.
Well, I supposed wrong. It is much easier to do it the way I wanted to
do it initially.


/* symbols may begin with an % to prevent name collisions with register
/* % prefixes will be trimmed */
#define tc_canonicalize_symbol_name(s) ( *(s) == '%' ? (s)+1 : (s))

That's all!

Jan Tlatlik

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]