[ECOS] a question

[ECOS] a question

[wwm]

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Hi, 
 
We are porting the eCos to the embedded 
microprocessor MPC823,as everyone know,the most improtant port is the HAL,but I 
can not find the syntax rules on how to write the assemble code in HAL. 
e.g. What do "I" mean in code:
 
        asm 
volatile ("mfspr %0, %1;" : "=r" (_v_) : "I" (_spr_));
 
 
The question is  where I can find 
the detailed documents about it.
Thank you in advance.
 

Re: [ECOS] a question

[Jonathan Larmour]

> wwm wrote:
> 
> We are porting the eCos to the embedded microprocessor MPC823,as everyone
> know,the most improtant port is the HAL,but I can not find the
> syntax rules on how to write the assemble code in HAL. e.g. What do "I"
> mean in code:
> 
>         asm volatile ("mfspr %0, %1;" : "=r" (_v_) : "I" (_spr_));
> 
> 
> The question is  where I can find the detailed documents about it.

This is gcc extended asm. You can find documentation in the gcc info files.
Use the "info gcc" command on linux; or I think they are available
somewhere on www.gnu.org as well.

Jifl
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