1991/0606/port/fault.c (diff list | history)

1991/0605/sys/src/9/port/fault.c:9,15 – 1991/0606/sys/src/9/port/fault.c:9,15 (short | long | prev | next)
1990/1212		int fault(ulong addr, int read)
1990/0227		{
1990/1212		ulong mmuvirt, mmuphys, n;
1991/0606		ulong mmuvirt, mmuphys = 0, n;
1990/0227		Seg *s; PTE *opte, *pte, *npte; Orig *o;
1991/0605/sys/src/9/port/fault.c:64,76 – 1991/0606/sys/src/9/port/fault.c:64,78
1990/0227		if(pte->page == 0){
1991/0425		touched = 1;
1990/0227		if(o->chan==0 || addr>(o->va+(o->maxca-o->minca))){ /* * Zero fill page. If we are really doing a copy-on-write * (e.g. into shared bss) we'll move the page later. */ pte->page = newpage(0, o, addr); o->npage++;
1991/0606		/* Make a new bss or lock segment page */ if(s - u->p->seg == LSEG) { pte->page = lkpage(o, addr); mmuphys = PTEUNCACHE; } else pte->page = newpage(0, o, addr);
1990/0227		zeroed = 1;
1991/0606		o->npage++;
1990/0227		}else{ /* * Demand load. Release o because it could take a while.
1991/0605/sys/src/9/port/fault.c:157,164 – 1991/0606/sys/src/9/port/fault.c:159,168
1990/0227		head = 0; } pg = pte->page; if(zeroed){ /* move page */ pg->ref--;
1991/0606		/* when creating pages in the bss which are zfod we create a double * increment on the mod list which must be removed */ if(zeroed){
1990/0227		o->npage--; opte->page = 0; }else{ /* copy page */
1991/0605/sys/src/9/port/fault.c:170,189 – 1991/0606/sys/src/9/port/fault.c:174,194
1990/1212		kunmap(k1);
1990/0227		if(pg->ref <= 1) panic("pg->ref <= 1"); pg->ref--; }
1991/0606		pg->ref--;
1990/0227		easy: mmuphys = PTEWRITE;
1991/0606		mmuphys |= PTEWRITE;
1990/0227		}else{
1990/1212		mmuphys = PTERONLY;
1991/0606		mmuphys |= PTERONLY;
1990/0227		if(o->flag & OWRPERM) if(o->flag & OPURE){ if(!head && pte->page->ref==1) mmuphys = PTEWRITE;
1991/0606		mmuphys |= PTEWRITE;
1990/0227		}else if((head && o->nproc==1) || (!head && pte->page->ref==1)) mmuphys = PTEWRITE;
1991/0606		mmuphys |= PTEWRITE;
1990/0227		} mmuvirt = addr;
1990/1212		mmuphys |= PPN(pte->page->pa) | PTEVALID;
1991/0605/sys/src/9/port/fault.c:212,218 – 1991/0606/sys/src/9/port/fault.c:217,224
1990/0227
1990/0617		if((long)len < 0){
1990/0312		Err:
1991/0115		pprint("invalid address %lux in sys call pc %lux sp %lux\n", addr, ((Ureg*)UREGADDR)->pc, ((Ureg*)UREGADDR)->sp);
1991/0606		pprint("invalid address %lux in sys call pc %lux sp %lux\n", addr, ((Ureg*)UREGADDR)->pc, ((Ureg*)UREGADDR)->sp);
1990/1110		postnote(u->p, 1, "sys: bad address", NDebug);
1990/11211		error(Ebadarg);
1990/0617		}
1991/0605/sys/src/9/port/fault.c:261,270 – 1991/0606/sys/src/9/port/fault.c:267,276
1990/0227		Seg* seg(Proc *p, ulong addr) { int i; Seg *s;
1991/0606		Seg *s, *et;
1990/0227		for(i=0,s=p->seg; i<NSEG; i++,s++)
1991/0606		et = &p->seg[NSEG]; for(s=p->seg; s < et; s++)
1990/0227		if(s->o && s->minva<=addr && addr<s->maxva) return s; return 0;