1 /* $NetBSD: db_interface.c,v 1.28 2022/10/26 23:38:07 riastradh Exp $ */
2
3 /* $OpenBSD: db_interface.c,v 1.16 2001/03/22 23:31:45 mickey Exp $ */
4
5 /*
6 * Copyright (c) 1999-2003 Michael Shalayeff
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: db_interface.c,v 1.28 2022/10/26 23:38:07 riastradh Exp $");
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/proc.h>
37
38 #include <machine/db_machdep.h>
39 #include <machine/frame.h>
40 #include <machine/cpufunc.h>
41
42 #include <ddb/db_access.h>
43 #include <ddb/db_active.h>
44 #include <ddb/db_command.h>
45 #include <ddb/db_output.h>
46 #include <ddb/db_run.h>
47 #include <ddb/db_sym.h>
48 #include <ddb/db_variables.h>
49 #include <ddb/db_extern.h>
50 #include <ddb/db_interface.h>
51 #include <ddb/ddbvar.h>
52
53 #include <dev/cons.h>
54
55 void kdbprinttrap(int, int);
56
57 extern const char *trap_type[];
58 extern int trap_types;
59
60 int db_active = 0;
61
62 void
cpu_Debugger(void)63 cpu_Debugger(void)
64 {
65 __asm volatile ("break %0, %1"
66 :: "i" (HPPA_BREAK_KERNEL), "i" (HPPA_BREAK_KGDB));
67 }
68
69 /*
70 * Print trap reason.
71 */
72 void
kdbprinttrap(int type,int code)73 kdbprinttrap(int type, int code)
74 {
75 db_printf("kernel: ");
76 if (type >= trap_types || type < 0)
77 db_printf("type %d", type);
78 else
79 db_printf("%s", trap_type[type]);
80 db_printf(" trap, code=%x\n", code);
81 }
82
83 /*
84 * kdb_trap - field a BPT trap
85 */
86 int
kdb_trap(int type,int code,db_regs_t * regs)87 kdb_trap(int type, int code, db_regs_t *regs)
88 {
89 int s;
90
91 switch (type) {
92 case T_RECOVERY:
93 case T_IBREAK:
94 case T_DBREAK:
95 case -1:
96 break;
97 default:
98 if (!db_onpanic && db_recover == 0)
99 return 0;
100
101 kdbprinttrap(type, code);
102 if (db_recover != 0) {
103 db_error("Caught exception in DDB; continuing...\n");
104 /* NOT REACHED */
105 }
106 }
107
108 /* XXX Should switch to kdb`s own stack here. */
109
110 ddb_regs = *regs;
111
112 s = splhigh();
113 db_active++;
114 cnpollc(true);
115 db_trap(type, code);
116 cnpollc(false);
117 db_active--;
118 splx(s);
119
120 *regs = ddb_regs;
121 return 1;
122 }
123
124 /*
125 * Validate an address for use as a breakpoint.
126 * Any address is allowed for now.
127 */
128 int
db_valid_breakpoint(db_addr_t addr)129 db_valid_breakpoint(db_addr_t addr)
130 {
131 return 1;
132 }
133