[superh-gnu-discuss] SH interrupt_handler function attribute register saving

[Andrew Stubbs]

On 13/10/09 07:45, Benjamin Heyne wrote:
> -Os   -ffixed-r13 -fno-builtin -ffreestanding -nostdinc -m3e -mb
> -fomit-frame-pointer -fno-stack-protector

Sorry Benjamin,

The current Lite release is purely for SH-4A targets. It has not been 
configured or tested for other SH targets.

If you require support for other SH targets please contact 
sales at codecourcery.com.

In the meantime, I suggest you write an assembler insert that saves the 
caller save registers, and then have that call a regular C function, 
without any attributes. Refer to the compiler's assembler output for how 
to define a function in assembler.

E.g.

asm ("
myinterruptentrypoint:
.....<save>
.....<call myinterrupthandler>
.....<load>");

void myinterrupthandler () {
   ....
}

There are probably other solutions also.

Andrew