Enquiry

[Vijay]

Michael,

         Thanks  for the response.  Could you please me how to set  
-mprolog-function and -mno-long-calls options in commnad line?  

Maybe

$  gcc  -mno-prolog-function  

somthing like above (well above option does not work....)


Thanks.



 
Michael Meissner wrote:
> On Tue, Jun 02, 2009 at 10:02:08PM +0900, Vijay Holimath wrote:
>   
>> Dear Sir,
>>
>>         I am using gcc compiler for v850e cpu. When I use the 
>> arrtribute: __attribute__ ((interrupt_handler)) or __attribute__ 
>> ((interrupt); for interrupt function,  say for example
>>
>> void swnmi() __attribute__ ((interrupt_handler));
>>
>> void swnmi()
>> {
>> ...
>> ..
>> }
>>
>> main()
>> {
>> ..
>> ..
>> }
>>
>> I am getting following error messages when I compile:
>>
>> main.o (.text+0xea): In function 'swnmi': undefined reference to '__ep'
>>
>> main.o (.text+0xee): In function 'swnmi': undefined reference to '__ep'
>>
>> collect2: Id returned 1 exit status
>>
>>
>> I will be grateful to you if you could help me to get rid of these error 
>> messages.  Probably I have to link some libraries?
>>     
>
> I worked on the V850 many years ago and added the initial ep support, but I
> haven't touched it for quite some time.
>
> The symbol __ep is expected to be the address to be loaded into the ep (r30)
> register, which is used in smaller instructions.  As you may or may not know,
> the V850 has a small data area that ep points to, and when the compiler is
> optimizing to use ep for other purposes, it needs to restore it after its done.
> The gnu linker creates __ep in the file scripttempl/v850.sc at the beginning of
> the .tdata section (.tdata is for tiny data).
>
> The reference to __ep is generated in callt_return_interrupt, and is done if
> you use the -mprolog-function and -mno-long-calls options (or they are set by
> default).
>
>