1990/0614/port/sysproc.c (diff list | history)

1990/0330/sys/src/9/port/sysproc.c:26,31 – 1990/0614/sys/src/9/port/sysproc.c:26,32 (short | long | prev | next)
1990/0227		ulong usp, upa, pid; Chan *c; Orig *o;
1990/0614		KMap *k;
1990/0227		int n, on, i; int lastvar; /* used to compute stack address */
1990/0330/sys/src/9/port/sysproc.c:34,40 – 1990/0614/sys/src/9/port/sysproc.c:35,43
1990/0227		*/ p = newproc(); p->upage = newpage(1, 0, USERADDR|(p->pid&0xFFFF)); upa = p->upage->pa|KZERO;
1990/0614		k = kmap(p->upage); upa = VA(k);
1990/0227		/* * Save time: only copy u-> data and useful stack */
1990/0330/sys/src/9/port/sysproc.c:41,48 – 1990/0614/sys/src/9/port/sysproc.c:44,52
1990/0227		memcpy((void*)upa, u, sizeof(User)); n = USERADDR+BY2PG - (ulong)&lastvar; n = (n+32) & ~(BY2WD-1); /* be safe & word align */ memcpy((void*)(upa+BY2PG-n), (void*)((u->p->upage->pa|KZERO)+BY2PG-n), n);
1990/0614		memcpy((void*)(upa+BY2PG-n), (void*)(USERADDR+BY2PG-n), n);
1990/0227		((User *)upa)->p = p;
1990/0614		kunmap(k);
1990/0227		/* * User stack
1990/0330/sys/src/9/port/sysproc.c:51,57 – 1990/0614/sys/src/9/port/sysproc.c:55,61
1990/0227		s = &p->seg[SSEG]; s->proc = p; on = (s->maxva-s->minva)>>PGSHIFT; usp = ((Ureg*)UREGADDR)->sp;
1990/0614		usp = ((Ureg*)UREGADDR)->usp;
1990/0227		if(usp >= USTKTOP) panic("fork bad usp %lux", usp); if(usp < u->p->seg[SSEG].minva)
1990/0330/sys/src/9/port/sysproc.c:70,82 – 1990/0614/sys/src/9/port/sysproc.c:74,88
1990/0227		op = u->p->seg[SSEG].o->pte[i+(on-n)].page; if(op){ np = newpage(1, s->o, op->va);
1990/0614		k = kmap(np);
1990/0227		p->seg[SSEG].o->pte[i].page = np; if(i == 0){ /* only part of last stack page */ memset((void*)(np->pa|KZERO), 0, usp); memcpy((void*)((np->pa+usp)|KZERO), (void*)((op->pa+usp)|KZERO), BY2PG-usp);
1990/0614		memset((void*)VA(k), 0, usp); memcpy((void*)(VA(k)+usp), (void*)(op->va+usp), BY2PG-usp);
1990/0227		}else /* all of higher pages */ memcpy((void*)(np->pa|KZERO), (void*)(op->pa|KZERO), BY2PG);
1990/0614		memcpy((void*)VA(k), (void*)op->va, BY2PG); kunmap(k);
1990/0227		} } unlock(s->o);
1990/0330/sys/src/9/port/sysproc.c:350,356 – 1990/0614/sys/src/9/port/sysproc.c:356,362
1990/0227		((Ureg*)UREGADDR)->pc = exec.entry - 4; sp = (ulong*)(USTKTOP - ssize); *--sp = nargs; ((Ureg*)UREGADDR)->sp = (ulong)sp;
1990/0614		((Ureg*)UREGADDR)->usp = (ulong)sp;
1990/0227		lock(&p->debug); u->nnote = 0; u->notify = 0;