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/*
* coswitch for the m68k architecture
*/
int
coswitch (int *old_cs, int *new_cs, int first)
{
asm ("movl %a6@(8),%a0"); /* a0 = old */
asm ("movl %a6@(12),%a1"); /* a1 = new */
asm ("movl %a7,%a0@"); /* save sp in cstate[0] */
asm ("movl %a6,%a0@(4)"); /* save a6 (fp) in cstate[0] */
asm ("moveml #0x3cfc,%a0@(8)"); /* store d2-d7, a2-a6 in old->cstate */
if (first == 0) { /* this is first activation */
asm ("movl %a1@,%a7");
asm ("movl #0,%a6");
new_context (0, 0);
syserr ("new_context() returned in coswitch");
}
else {
asm ("movl %a1@,%a7"); /* restore sp */
asm ("movl %a1@(4),%a6"); /* restore fp */
asm ("moveml %a1@(8),#0x3cfc"); /* restore d2-d7, a2-a6 */
}
}
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