i386/i386/trap.c

107 void trap(struct trapframe *frame);
108 void syscall(struct trapframe *frame);
212  * routines that prepare a suitable stack frame, and restore this
213  * frame after the exception has been processed.
217 trap(struct trapframe *frame)
235 	type = frame->tf_trapno;
238 	    ("trap: interrupts enabled, type %d frame %p", type, frame));
255 		trap_fatal(frame, 0);
269 		    (*pmc_intr)(frame) != 0)
288 	    dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type))
307 	if ((frame->tf_eflags & PSL_I) == 0 && TRAPF_USERMODE(frame) &&
320 	    frame->tf_eip != (int)cpu_switch_load_gs)
323         if (TRAPF_USERMODE(frame) && (curpcb->pcb_flags & PCB_VM86CALL) == 0) {
327 		td->td_frame = frame;
328 		addr = frame->tf_eip;
340 			if (trap_user_dtrace(frame, &dtrace_pid_probe_ptr))
378 			if (frame->tf_eflags & PSL_VM) {
379 				signo = vm86_emulate((struct vm86frame *)frame);
412 			pf = trap_pfault(frame, true, eva, &signo, &ucode);
420 				type = frame->tf_trapno = T_PRIVINFLT;
447 			nmi_handle_intr(type, frame);
486 			(void)trap_user_dtrace(frame, &dtrace_return_probe_ptr);
497 			(void)trap_pfault(frame, false, eva, NULL, NULL);
514 			trap_fatal(frame, 0);
524 			if (frame->tf_eflags & PSL_VM) {
525 				signo = vm86_emulate((struct vm86frame *)frame);
535 					vm86_trap((struct vm86frame *)frame);
552 			if (frame->tf_eip == (int)cpu_switch_load_gs) {
576 			 * does not push %esp on the trap frame,
584 			if (frame->tf_eip == (int)doreti_iret + setidt_disp) {
585 				frame->tf_eip = (int)doreti_iret_fault +
592 			if (frame->tf_eip == (int)doreti_popl_ds +
594 				frame->tf_eip = (int)doreti_popl_ds_fault +
598 			if (frame->tf_eip == (int)doreti_popl_es +
600 				frame->tf_eip = (int)doreti_popl_es_fault +
604 			if (frame->tf_eip == (int)doreti_popl_fs +
606 				frame->tf_eip = (int)doreti_popl_fs_fault +
611 				frame->tf_eip = (int)curpcb->pcb_onfault;
626 			if (frame->tf_eflags & PSL_NT) {
627 				frame->tf_eflags &= ~PSL_NT;
674 			if (frame->tf_eip ==
676 			    frame->tf_eip == (uintptr_t)IDTVEC(bpt) +
678 			    frame->tf_eip == (uintptr_t)IDTVEC(dbg) +
690 			if (kdb_trap(type, dr6, frame))
704 			nmi_handle_intr(type, frame);
709 		trap_fatal(frame, eva);
722 		    p->p_pid, p->p_comm, signo, frame->tf_err, ucode, type,
723 		    addr, frame->tf_ss, frame->tf_esp, frame->tf_cs,
724 		    frame->tf_eip, frame->tf_eax,
725 		    fubyte((void *)(frame->tf_eip + 0)),
726 		    fubyte((void *)(frame->tf_eip + 1)),
727 		    fubyte((void *)(frame->tf_eip + 2)),
728 		    fubyte((void *)(frame->tf_eip + 3)),
729 		    fubyte((void *)(frame->tf_eip + 4)),
730 		    fubyte((void *)(frame->tf_eip + 5)),
731 		    fubyte((void *)(frame->tf_eip + 6)),
732 		    fubyte((void *)(frame->tf_eip + 7)));
738 	userret(td, frame);
757 trap_pfault(struct trapframe *frame, bool usermode, vm_offset_t eva,
811 			trap_fatal(frame, eva);
836 		trap_fatal(frame, eva);
847 			trap_fatal(frame, eva);
855 	if (frame->tf_err & PGEX_RSV) {
856 		trap_fatal(frame, eva);
864 	if (frame->tf_err & PGEX_W)
866 	else if ((frame->tf_err & PGEX_I) && pg_nx != 0)
876 			PMC_SOFT_CALL_TF( , , page_fault, all, frame);
879 				    frame);
882 				    frame);
891 		frame->tf_eip = (int)curpcb->pcb_onfault;
894 	trap_fatal(frame, eva);
899 trap_fatal(struct trapframe *frame, vm_offset_t eva)
908 	code = frame->tf_err;
909 	type = frame->tf_trapno;
910 	sdtossd(&gdt[IDXSEL(frame->tf_cs & 0xffff)].sd, &softseg);
913 	    frame->tf_eflags & PSL_VM ? "vm86" :
914 	    ISPL(frame->tf_cs) == SEL_UPL ? "user" : "kernel");
934 	       frame->tf_cs & 0xffff, frame->tf_eip);
935         if (TF_HAS_STACKREGS(frame)) {
936 		ss = frame->tf_ss & 0xffff;
937 		esp = frame->tf_esp;
940 		esp = (int)&frame->tf_esp;
943 	printf("frame pointer	        = 0x%x:0x%x\n", ss, frame->tf_ebp);
950 	if (frame->tf_eflags & PSL_T)
952 	if (frame->tf_eflags & PSL_I)
954 	if (frame->tf_eflags & PSL_NT)
956 	if (frame->tf_eflags & PSL_RF)
958 	if (frame->tf_eflags & PSL_VM)
960 	printf("IOPL = %d\n", (frame->tf_eflags & PSL_IOPL) >> 12);
967 		frame->tf_err = eva;	/* smuggle fault address to ddb */
968 		handled = kdb_trap(type, 0, frame);
969 		frame->tf_err = code;	/* restore error code */
989 trap_user_dtrace(struct trapframe *frame, int (**hookp)(struct trapframe *))
996 		return ((hook)(frame) == 0);
1003  * a frame for a trap/exception onto the stack. This usually occurs
1046 	struct trapframe *frame;
1057 	frame = td->td_frame;
1061 	if (__predict_false(frame->tf_cs == 7 && frame->tf_eip == 2)) {
1064 		 * frame to what it would be for a direct int 0x80 instead
1067 		error = fueword32((void *)frame->tf_esp, &eip);
1070 		cs = fuword16((void *)(frame->tf_esp + sizeof(u_int32_t)));
1075 		 * Unwind in-kernel frame after all stack frame pieces
1078 		frame->tf_eip = eip;
1079 		frame->tf_cs = cs;
1080 		frame->tf_esp += 2 * sizeof(u_int32_t);
1081 		frame->tf_err = 7;	/* size of lcall $7,$0 */
1085 	sa->code = frame->tf_eax;
1087 	params = (caddr_t)frame->tf_esp + sizeof(uint32_t);
1126 		td->td_retval[1] = frame->tf_edx;
1136  * essentially treated as a trap by reusing the frame layout.
1139 syscall(struct trapframe *frame)
1146 	if (!(TRAPF_USERMODE(frame) &&
1153 	orig_tf_eflags = frame->tf_eflags;
1156 	td->td_frame = frame;
1164 		frame->tf_eflags &= ~PSL_T;
1168 		ksi.ksi_addr = (void *)frame->tf_eip;