plan 9 kernel history: overview | file list | diff list

1990/0511/gnot/trap.c (diff list | history)

1990/0322/sys/src/9/gnot/trap.c:259,276 – 1990/0511/sys/src/9/gnot/trap.c:259,284 (short | long | prev | next)
1990/03091    
#endif 
	r0 = ur->r0; 
	sp = ur->usp; 
	if(r0 >= sizeof systab/BY2WD) 
		panic("syscall %d\n", r0); 
	if(sp & (BY2WD-1)) 
		panic("syscall odd sp"); 
	if(sp<(USTKTOP-BY2PG) || sp>(USTKTOP-4*BY2WD)) 
		validaddr(sp, 4*BY2WD, 0); 
 
	u->nerrlab = 0; 
	ret = -1; 
	if(!waserror()) 
		ret = (*systab[r0])((ulong*)(sp+BY2WD));
1990/0322    
/* else print("syscall %d err %d %d\n", r0, u->error.type, u->error.code); /**/
1990/0511    
	if(!waserror()){ 
		if(r1 >= sizeof systab/BY2WD){ 
			pprint("bad sys call number %d pc %lux\n", r1, ((Ureg*)UREGADDR)->pc); 
			msg = "bad sys call"; 
	    Bad: 
			postnote(u->p, 1, msg, NDebug); 
			error(0, Ebadarg); 
		} 
		if(sp & (BY2WD-1)){ 
			pprint("odd sp in sys call pc %lux sp %lux\n", ((Ureg*)UREGADDR)->pc, ((Ureg*)UREGADDR)->sp); 
			msg = "odd stack"; 
			goto Bad; 
		} 
		if(sp<(USTKTOP-BY2PG) || sp>(USTKTOP-4*BY2WD)) 
			validaddr(ur->sp, 4*BY2WD, 0); 
		ret = (*systab[r1])((ulong*)(sp+2*BY2WD)); 
	}
1990/03091    
	u->nerrlab = 0; 
	u->p->insyscall = 0; 
	if(r0 == NOTED)	/* ugly hack */


source code copyright © 1990-2005 Lucent Technologies; see license
Plan 9 distribution
comments to russ cox (rsc@swtch.com)