Re: [OpenBIOS] [PATCH 2/4] ppc: add new context handler

[Programmingkid]

On May 1, 2016, at 6:23 AM, Mark Cave-Ayland wrote:
> +/* Switch to another context. */
> +struct context *switch_to(struct context *ctx)
> +{
> volatile struct context *save;
> struct context *ret;
> unsigned int lr;
> debug("switching to new context:\n");
> save = __context;
> __context = ctx;
> asm __volatile__ ("mflr %0\n\t" : "=r" (lr) : : );

This line breaks compatibility with gcc 4.2.3. A simple fix is this:
      asm __volatile__ ("mflr %0\n\t" : "=r" (lr));
                
    		and this
> asm __volatile__ ("mtlr %0\n\t" : : "r" (lr) : );

asm __volatile__ ("mtlr %0\n\t" : : "r" (lr));