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db_interface.c revision 1.9 
      1 /*	$NetBSD: db_interface.c,v 1.9 2001/02/04 17:38:11 briggs 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 ddb_trap __P((void));		     /* Call into trap_subr.S */
     23 int ddb_trap_glue __P((struct trapframe *)); /* Called from trap_subr.S */
     24 
     25 void
     26 cpu_Debugger()
     27 {
     28 	ddb_trap();
     29 }
     30 
     31 int
     32 ddb_trap_glue(frame)
     33 	struct trapframe *frame;
     34 {
     35 	if (!(frame->srr1 & PSL_PR)
     36 	    && (frame->exc == EXC_TRC
     37 		|| (frame->exc == EXC_PGM
     38 		    && (frame->srr1 & 0x20000))
     39 		|| frame->exc == EXC_BPT)) {
     40 
     41 		bcopy(frame->fixreg, DDB_REGS->r, 32 * sizeof(u_int32_t));
     42 		DDB_REGS->iar = frame->srr0;
     43 		DDB_REGS->msr = frame->srr1;
     44 
     45 		db_trap(T_BREAKPOINT, 0);
     46 
     47 		bcopy(DDB_REGS->r, frame->fixreg, 32 * sizeof(u_int32_t));
     48 
     49 		return 1;
     50 	}
     51 	return 0;
     52 }
     53 
     54 int
     55 kdb_trap(type, v)
     56 	int type;
     57 	void *v;
     58 {
     59 	struct trapframe *frame = v;
     60 
     61 	switch (type) {
     62 	case T_BREAKPOINT:
     63 	case -1:
     64 		break;
     65 	default:
     66 		if (!db_onpanic && db_recover == 0)
     67 			return 0;
     68 		if (db_recover != 0) {
     69 			db_error("Faulted in DDB; continuing...\n");
     70 			/*NOTREACHED*/
     71 		}
     72 	}
     73 
     74 	/* XXX Should switch to kdb's own stack here. */
     75 
     76 	bcopy(frame->fixreg, DDB_REGS->r, 32 * sizeof(u_int32_t));
     77 	DDB_REGS->iar = frame->srr0;
     78 	DDB_REGS->msr = frame->srr1;
     79 
     80 	db_trap(T_BREAKPOINT, 0);
     81 
     82 	bcopy(DDB_REGS->r, frame->fixreg, 32 * sizeof(u_int32_t));
     83 	frame->srr0 = DDB_REGS->iar;
     84 	frame->srr1 = DDB_REGS->msr;
     85 
     86 	return 1;
     87 }
     88