1991/01151/ss/trap.c (diff list | history)

1991/0115/sys/src/9/ss/trap.c:53,99 – 1991/01151/sys/src/9/ss/trap.c:53,147 (short | long | prev | next)
1990/1223		void trap(Ureg *ur) { int user;
1991/01151		int user, x;
1990/1223		char buf[64];
1990/1227		ulong tbr;
1990/1223
1990/1227		tbr = (ur->tbr&0xFFF)>>4;
1991/0110		if(tbr == 16+15){ /* interrupt 14: counter 1 */ faultasync(ur); return; }
1990/1231		if(tbr == 16+14){ /* interrupt 14: counter 1 */
1990/1227		clock(ur);
1990/1231		return; } if(tbr == 16+12){ /* interrupt 12: keyboard and mouse */ duartintr(); return; } if(tbr == 16+5){ /* interrupt 5: lance */ lanceintr();
1990/1227		return; }
1991/0115		if(tbr == 8) /* floating point exception */ clearfpintr();
1990/1227
1990/1226		user = !(ur->psr&PSRPSUPER);                  /* if(u)
1991/01151		if(u)
1990/1223		u->p->pc = ur->pc; /* BUG */ if(user){
1990/1227		sprint(buf, "sys: trap: pc=0x%lux %s", ur->pc, excname(tbr));
1991/0115		if(tbr == 8) sprint(buf+strlen(buf), " FSR %lux", getfsr());
1990/1223		postnote(u->p, 1, buf, NDebug);
1991/01151		user = !(ur->psr&PSRPSUPER); tbr = (ur->tbr&0xFFF)>>4; if(tbr > 16){ /* interrupt */ if(u && u->p->state==Running){ if(u->p->fpstate == FPactive) { savefpregs(&u->fpsave); u->p->fpstate = FPinactive; ur->psr &= ~PSREF; } } switch(tbr-16){ case 15: /* asynch mem err */ faultasync(ur); break; case 14: /* counter 1 */ clock(ur); break; case 12: /* keyboard and mouse */ duartintr(); break; case 5: /* lance */ lanceintr(); break; default: goto Error; }
1990/1223		}else{
1990/1227		print("kernel trap: %s pc=0x%lux\n", excname(tbr), ur->pc);
1990/1223		dumpregs(ur);
1990/1226		for(;;);
1990/1223		exit();
1991/01151		switch(tbr){ case 1: /* instr. access */ case 9: /* data access */ if(u && u->p->fpstate==FPactive) { savefpregs(&u->fpsave); u->p->fpstate = FPinactive; ur->psr &= ~PSREF; } if(u){ x = u->p->insyscall; u->p->insyscall = 1; faultsparc(ur); u->p->insyscall = x; }else faultsparc(ur); goto Return; case 4: /* floating point disabled */ if(u && u->p){ if(u->p->fpstate == FPinit) restfpregs(&initfp); else if(u->p->fpstate == FPinactive) restfpregs(&u->fpsave); else break; u->p->fpstate = FPactive; ur->psr |= PSREF; return; } break; case 8: /* floating point exception */ clearfpintr(); break; default: break; } if(user){ spllo(); sprint(buf, "sys: trap: pc=0x%lux %s", ur->pc, excname(tbr)); if(tbr == 8) sprint(buf+strlen(buf), " FSR %lux", u->fpsave.fsr); postnote(u->p, 1, buf, NDebug); }else{ Error: print("kernel trap: %s pc=0x%lux\n", excname(tbr), ur->pc); dumpregs(ur); for(;;); } if(user && u->nnote) notify(ur);
1990/1223		}
1991/0112		if(user && u->nnote)
1990/1223		notify(ur);
1991/01151		Return: if(user && u && u->p->fpstate == FPinactive) { restfpregs(&u->fpsave); u->p->fpstate = FPactive; ur->psr |= PSREF; }
1990/1223		} void
1991/0115/sys/src/9/ss/trap.c:272,290 – 1991/01151/sys/src/9/ss/trap.c:320,335
1990/1223		u->p->pc = ur->pc;
1990/1226		if(ur->psr & PSRPSUPER)
1990/1223		panic("recursive system call");
1990/1226		#ifdef asdf
1991/01151
1990/1223		/* * since the system call interface does not * guarantee anything about registers, but the fpcr is more than * just a register... BUG
1991/01151		* guarantee anything about registers,
1990/1223		*/ fpsave(&u->fpsave); if(u->p->fpstate==FPactive || u->fpsave.type){ fprestore(&initfp);
1991/01151		if(u->p->fpstate == FPactive) {
1990/1223		u->p->fpstate = FPinit; m->fpstate = FPinit;
1991/01151		ur->psr &= ~PSREF;
1990/1223		}
1990/1226		#endif
1991/01151
1990/1223		spllo();
1990/1226		r7 = ur->r7;
1990/1223		sp = ur->usp;