1992/06271/pc/trap.c (diff list | history)

1992/0625/sys/src/9/pc/trap.c:305,311 – 1992/06271/sys/src/9/pc/trap.c:305,310 (short | long | prev | next)
1991/0710		long syscall(Ureg *ur) {
1991/0720		ulong ax; ulong sp; long ret; int i;
1992/0625/sys/src/9/pc/trap.c:318,330 – 1992/06271/sys/src/9/pc/trap.c:317,329
1991/0720		/* * do something about floating point!!! */ ax = ur->ax;
1992/06271		u->scallnr = ur->ax;
1991/0720		sp = ur->usp; u->nerrlab = 0; ret = -1; if(!waserror()){ if(ax >= sizeof systab/BY2WD){ pprint("bad sys call number %d pc %lux\n", ax, ur->pc);
1992/06271		if(u->scallnr >= sizeof systab/BY2WD){ pprint("bad sys call number %d pc %lux\n", u->scallnr, ur->pc);
1991/0720		postnote(u->p, 1, "sys: bad sys call", NDebug); error(Ebadarg); }
1992/0625/sys/src/9/pc/trap.c:333,345 – 1992/06271/sys/src/9/pc/trap.c:332,344
1991/0720		validaddr(sp, (1+MAXSYSARG)*BY2WD, 0);
1992/0625		u->s = *((Sargs*)(sp+1*BY2WD));
1991/0926		u->p->psstate = sysctab[ax];
1992/06271		u->p->psstate = sysctab[u->scallnr];
1992/0625		ret = (*systab[ax])(u->s.args);
1992/06271		ret = (*systab[u->scallnr])(u->s.args);
1991/0720		poperror(); } if(u->nerrlab){ print("bad errstack [%d]: %d extra\n", ax, u->nerrlab);
1992/06271		print("bad errstack [%d]: %d extra\n", u->scallnr, u->nerrlab);
1991/0720		for(i = 0; i < NERR; i++) print("sp=%lux pc=%lux\n", u->errlab[i].sp, u->errlab[i].pc); panic("error stack");
1992/0625/sys/src/9/pc/trap.c:356,366 – 1992/06271/sys/src/9/pc/trap.c:355,365
1992/0609		*/
1991/0801		ur->ax = ret;
1992/0609
1991/1114		if(ax == NOTED)
1992/06271		if(u->scallnr == NOTED)
1991/0720		noted(ur, *(ulong*)(sp+BY2WD));
1991/1114
1992/0103		splhi(); /* avoid interrupts during the iret */
1992/0430		if(ax!=RFORK && (u->p->procctl || u->nnote))
1992/06271		if(u->scallnr!=RFORK && (u->p->procctl || u->nnote))
1991/0720		notify(ur); return ret;
1991/0710		}