1991/1112/pc/trap.c (diff list | history)

1991/1005/sys/src/9/pc/trap.c:68,73 – 1991/1112/sys/src/9/pc/trap.c:68,86 (short | long | prev | next)
1991/0709		}
1991/0703		}
1991/1112		void debugbpt(Ureg *ur) { char buf[ERRLEN]; if(u == 0) panic("kernel bpt"); /* restore pc to instruction that caused the trap */ ur->pc--; sprint(buf, "sys: breakpoint pc=0x%lux", ur->pc); postnote(u->p, 1, buf, NDebug); }
1991/0614		/*
1991/0703		* set up the interrupt/trap gates
1991/0614		*/
1991/1005/sys/src/9/pc/trap.c:88,94 – 1991/1112/sys/src/9/pc/trap.c:101,106
1991/0823		sethvec(0, intr0, SEGTG, 0); sethvec(1, intr1, SEGTG, 0); sethvec(2, intr2, SEGTG, 0); sethvec(3, intr3, SEGTG, 0); sethvec(4, intr4, SEGTG, 0); sethvec(5, intr5, SEGTG, 0); sethvec(6, intr6, SEGTG, 0);
1991/1005/sys/src/9/pc/trap.c:128,133 – 1991/1112/sys/src/9/pc/trap.c:140,147
1991/0710		*/
1991/0910		sethvec(Syscallvec, intr64, SEGTG, 3); setvec(Syscallvec, (void (*)(Ureg*))syscall);
1991/1112		sethvec(Bptvec, intr3, SEGTG, 3); setvec(Bptvec, debugbpt);
1991/0710		/*
1991/0703		* tell the hardware where the table is (and how long)
1991/1005/sys/src/9/pc/trap.c:171,189 – 1991/1112/sys/src/9/pc/trap.c:185,203
1991/0710		void
1991/0703		trap(Ureg *ur)
1991/0614		{
1991/0731		int v;
1991/1112		int v, user;
1991/0731		int c;
1991/1005		static int spuriousfloppy;
1991/0703
1991/0731		v = ur->trap;
1991/0807		if(v>=256 || ivec[v] == 0){
1991/1005		if(v == 10 && spuriousfloppy == 0){ v = Floppyvec; spuriousfloppy = 1; }else panic("bad trap type %d %lux %lux %lux\n", v, ur->pc, int0mask, int1mask);
1991/0807		}
1991/0731
1991/1112		user = ((ur->cs)&0xffff)!=KESEL && v!=Syscallvec; if(user) u->dbgreg = ur; if(v>=256 || ivec[v] == 0) panic("bad trap type %d %lux %lux %lux\n", v, ur->pc, int0mask, int1mask);
1991/0709		/* * tell the 8259 that we're done with the
1991/0801		* highest level interrupt (interrupts are still
1991/1005/sys/src/9/pc/trap.c:203,209 – 1991/1112/sys/src/9/pc/trap.c:217,223
1991/0913		/* * syscall does it's own notifying */
1991/0910		if(((ur->cs)&0xffff)!=KESEL && u->nnote && v!=Syscallvec)
1991/1112		if(user)
1991/0910		notify(ur);
1991/0806		}
1991/1005/sys/src/9/pc/trap.c:273,278 – 1991/1112/sys/src/9/pc/trap.c:287,293
1991/0720
1991/0718		u->p->insyscall = 1; u->p->pc = ur->pc;
1991/1112		u->dbgreg = ur;
1991/0720		if((ur->cs)&0xffff == KESEL) panic("recursive system call");
1991/0718
1991/1005/sys/src/9/pc/trap.c:307,313 – 1991/1112/sys/src/9/pc/trap.c:322,328
1991/0801		ur->ax = ret;
1991/0802		if(ax == NOTED){
1991/0720		noted(ur, *(ulong*)(sp+BY2WD));
1991/0802		} else if(u->nnote && ax!=FORK){
1991/1112		} else if(u->p->procctl || (u->nnote && ax!=FORK)){
1991/0720		notify(ur); } return ret;
1991/1005/sys/src/9/pc/trap.c:322,332 – 1991/1112/sys/src/9/pc/trap.c:337,347
1991/0710		{
1991/0720		ulong sp; lock(&u->p->debug); if(u->nnote==0){ unlock(&u->p->debug);
1991/1112		if(u->p->procctl) procctl(u->p); if(u->nnote==0)
1991/0720		return; }
1991/1112		lock(&u->p->debug);
1991/0727		u->p->notepending = 0;
1991/0720		if(u->note[0].flag!=NUser && (u->notified || u->notify==0)){ if(u->note[0].flag == NDebug)
1991/1005/sys/src/9/pc/trap.c:420,423 – 1991/1112/sys/src/9/pc/trap.c:435,457
1991/0720		unlock(&u->p->debug); pexit(u->lastnote.msg, u->lastnote.flag!=NDebug); }
1991/1112		} /* This routine must save the values of registers the user is not permitted to write * from devproc and the restore the saved values before returning */ void setregisters(Ureg *xp, char *pureg, char *uva, int n) { ulong flags; ulong cs; ulong ss; flags = xp->flags; cs = xp->cs; ss = xp->ss; memmove(pureg, uva, n); xp->flags = (xp->flags & 0xff) | (flags & 0xff00); xp->cs = cs; xp->ss = ss;
1991/0614		}