Re: help needed with porting to m68k

[Roman Zippel <zippel@linux-m68k.org>]

Hi,

Ralf Treinen wrote:

> There is an old patch to an earlier version that says to make the
> packet compile on m68k. The patch does no longer apply literally
> to recent versions of the file in question (the patch was submitted
> before I adopted the package). Since I don't understand anything
> about the memory managing stuff I will need some help to adapt
> it to the recent version.

You could look into boehm-gc for how it's done there. Here is the
relevant info from there:

void handler(int sig, int code, struct sigcontext *scp)
{
          int format = (scp->sc_formatvec >> 12) & 0xf;
          unsigned long *framedata = (unsigned long *)(scp + 1);
          unsigned long ea;

          if (format == 0xa || format == 0xb) {
                /* 68020/030 */
                ea = framedata[2];
          } else if (format == 7) {
                /* 68040 */
                ea = framedata[3];
                if (framedata[1] & 0x08000000) {
                        /* correct addr on misaligned access */
                        ea = (ea+4095)&(~4095);
                }
          } else if (format == 4) {
                /* 68060 */
                ea = framedata[0];
                if (framedata[1] & 0x08000000) {
                        /* correct addr on misaligned access */
                        ea = (ea+4095)&(~4095);
                }
          }
          addr = (char *)ea;
}

bye, Roman