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db_interface.c revision 1.8 
      1 /*	$NetBSD: db_interface.c,v 1.8 2000/11/24 21:49:06 tsubai Exp $ */
      2 /*	$OpenBSD: db_interface.c,v 1.2 1996/12/28 06:21:50 rahnds Exp $	*/
      3 
      4 #include "opt_ddb.h"
      5 
      6 #include <sys/param.h>
      7 #include <sys/proc.h>
      8 #include <sys/systm.h>
      9 
     10 #include <machine/db_machdep.h>
     11 #include <machine/frame.h>
     12 
     13 #include <ddb/db_sym.h>
     14 #include <ddb/db_command.h>
     15 #include <ddb/db_extern.h>
     16 #include <ddb/db_access.h>
     17 #include <ddb/db_output.h>
     18 #include <ddb/ddbvar.h>
     19 
     20 extern label_t *db_recover;
     21 
     22 void
     23 cpu_Debugger()
     24 {
     25 	ddb_trap();
     26 }
     27 
     28 int
     29 ddb_trap_glue(frame)
     30 	struct trapframe *frame;
     31 {
     32 	int msr;
     33 
     34 	if (!(frame->srr1 & PSL_PR)
     35 	    && (frame->exc == EXC_TRC
     36 		|| (frame->exc == EXC_PGM
     37 		    && (frame->srr1 & 0x20000))
     38 		|| frame->exc == EXC_BPT)) {
     39 
     40 		bcopy(frame->fixreg, DDB_REGS->r, 32 * sizeof(u_int32_t));
     41 		DDB_REGS->iar = frame->srr0;
     42 		DDB_REGS->msr = frame->srr1;
     43 
     44 		db_trap(T_BREAKPOINT, 0);
     45 
     46 		bcopy(DDB_REGS->r, frame->fixreg, 32 * sizeof(u_int32_t));
     47 
     48 		return 1;
     49 	}
     50 	return 0;
     51 }
     52 
     53 int
     54 kdb_trap(type, v)
     55 	int type;
     56 	void *v;
     57 {
     58 	struct trapframe *frame = v;
     59 
     60 	switch (type) {
     61 	case T_BREAKPOINT:
     62 	case -1:
     63 		break;
     64 	default:
     65 		if (!db_onpanic && db_recover == 0)
     66 			return 0;
     67 		if (db_recover != 0) {
     68 			db_error("Faulted in DDB; continuing...\n");
     69 			/*NOTREACHED*/
     70 		}
     71 	}
     72 
     73 	/* XXX Should switch to kdb's own stack here. */
     74 
     75 	bcopy(frame->fixreg, DDB_REGS->r, 32 * sizeof(u_int32_t));
     76 	DDB_REGS->iar = frame->srr0;
     77 	DDB_REGS->msr = frame->srr1;
     78 
     79 	db_trap(T_BREAKPOINT, 0);
     80 
     81 	bcopy(DDB_REGS->r, frame->fixreg, 32 * sizeof(u_int32_t));
     82 	frame->srr0 = DDB_REGS->iar;
     83 	frame->srr1 = DDB_REGS->msr;
     84 
     85 	return 1;
     86 }
     87