1 /* $NetBSD: kgdb_machdep.c,v 1.8 2011/07/01 19:22:35 dyoung Exp $ */
2
3 /*-
4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Machine-dependent functions for remote KGDB.
34 */
35
36 #include "opt_kgdb.h"
37
38 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
39
40 __KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.8 2011/07/01 19:22:35 dyoung Exp $");
41
42 #include "com.h"
43
44 #include <sys/param.h>
45 #include <sys/kgdb.h>
46 #include <sys/systm.h>
47 #include <sys/termios.h>
48
49 #include <sys/bus.h>
50 #include <machine/db_machdep.h>
51
52 #if NCOM > 0
53 #include <dev/ic/comreg.h>
54 #include <dev/ic/comvar.h>
55 #endif /* NCOM > 0 */
56
57 #ifndef KGDB_DEVNAME
58 #error Must define KGDB_DEVNAME
59 #endif
60 const char kgdb_devname[] = KGDB_DEVNAME;
61
62 #ifndef KGDB_DEVADDR
63 #error Must define KGDB_DEVADDR
64 #endif
65 int kgdb_devaddr = KGDB_DEVADDR;
66
67 #ifndef KGDB_DEVRATE
68 #define KGDB_DEVRATE TTYDEF_SPEED
69 #endif
70 int kgdb_devrate = KGDB_DEVRATE;
71
72 #ifndef KGDB_DEVMODE
73 /* 8N1 */
74 #define KGDB_DEVMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8)
75 #endif
76 int kgdb_devmode = KGDB_DEVMODE;
77
78 /*
79 * alpha_kgdb_init:
80 *
81 * Initialize KGDB -- connect to the device.
82 */
83 void
alpha_kgdb_init(const char ** valid_devs,struct alpha_bus_space * bst)84 alpha_kgdb_init(const char **valid_devs, struct alpha_bus_space *bst)
85 {
86 int i;
87
88 for (i = 0; valid_devs[i] != NULL; i++) {
89 if (strcmp(kgdb_devname, valid_devs[i]) == 0)
90 break;
91 }
92 if (valid_devs[i] == NULL) {
93 printf("%s is not a valid KGDB device for this platform\n",
94 kgdb_devname);
95 return;
96 }
97
98 #if NCOM > 0
99 if (strcmp(kgdb_devname, "com") == 0) {
100 com_kgdb_attach(bst, kgdb_devaddr, kgdb_devrate, COM_FREQ,
101 COM_TYPE_NORMAL, kgdb_devmode);
102 return;
103 }
104 #endif /* NCOM > 0 */
105
106 printf("The %s driver is not configured into the kernel; "
107 "KGDB not attached\n", kgdb_devname);
108 }
109
110 /*
111 * kgdb_acc:
112 *
113 * Determine if the mapping at va..(va+len) is valid.
114 */
115 int
kgdb_acc(vaddr_t va,size_t len)116 kgdb_acc(vaddr_t va, size_t len)
117 {
118 vaddr_t last_va;
119 pt_entry_t *pte;
120
121 va = trunc_page(va);
122 last_va = round_page(va + len);
123
124 do {
125 if (va < VM_MIN_KERNEL_ADDRESS)
126 return (0);
127 pte = pmap_l3pte(pmap_kernel(), va, NULL);
128 if (pte == NULL || pmap_pte_v(pte) == 0)
129 return (0);
130 va += PAGE_SIZE;
131 } while (va < last_va);
132
133 return (1);
134 }
135
136 /*
137 * kgdb_signal:
138 *
139 * Translate a trap number into a Unix-compatible signal number.
140 * (GDB only understands Unix signal numbers.)
141 */
142 int
kgdb_signal(int type)143 kgdb_signal(int type)
144 {
145
146 switch (type) {
147 case ALPHA_KENTRY_UNA:
148 return (SIGBUS);
149
150 case ALPHA_KENTRY_ARITH:
151 return (SIGFPE);
152
153 case ALPHA_KENTRY_IF:
154 return (SIGILL);
155
156 case ALPHA_KENTRY_MM:
157 return (SIGSEGV);
158
159 default:
160 return (SIGEMT);
161 }
162 }
163
164 /*
165 * kgdb_getregs:
166 *
167 * Translate the kernel debugger register format into
168 * the GDB register format.
169 */
170 void
kgdb_getregs(db_regs_t * regs,kgdb_reg_t * gdb_regs)171 kgdb_getregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
172 {
173
174 memset(gdb_regs, 0, sizeof(kgdb_reg_t) * KGDB_NUMREGS);
175
176 gdb_regs[KGDB_REG_V0 ] = regs->tf_regs[FRAME_V0];
177 gdb_regs[KGDB_REG_T0 ] = regs->tf_regs[FRAME_T0];
178 gdb_regs[KGDB_REG_T1 ] = regs->tf_regs[FRAME_T1];
179 gdb_regs[KGDB_REG_T2 ] = regs->tf_regs[FRAME_T2];
180 gdb_regs[KGDB_REG_T3 ] = regs->tf_regs[FRAME_T3];
181 gdb_regs[KGDB_REG_T4 ] = regs->tf_regs[FRAME_T4];
182 gdb_regs[KGDB_REG_T5 ] = regs->tf_regs[FRAME_T5];
183 gdb_regs[KGDB_REG_T6 ] = regs->tf_regs[FRAME_T6];
184 gdb_regs[KGDB_REG_T7 ] = regs->tf_regs[FRAME_T7];
185 gdb_regs[KGDB_REG_S0 ] = regs->tf_regs[FRAME_S0];
186 gdb_regs[KGDB_REG_S1 ] = regs->tf_regs[FRAME_S1];
187 gdb_regs[KGDB_REG_S2 ] = regs->tf_regs[FRAME_S2];
188 gdb_regs[KGDB_REG_S3 ] = regs->tf_regs[FRAME_S3];
189 gdb_regs[KGDB_REG_S4 ] = regs->tf_regs[FRAME_S4];
190 gdb_regs[KGDB_REG_S5 ] = regs->tf_regs[FRAME_S5];
191 gdb_regs[KGDB_REG_S6 ] = regs->tf_regs[FRAME_S6];
192 gdb_regs[KGDB_REG_A0 ] = regs->tf_regs[FRAME_A0];
193 gdb_regs[KGDB_REG_A1 ] = regs->tf_regs[FRAME_A1];
194 gdb_regs[KGDB_REG_A2 ] = regs->tf_regs[FRAME_A2];
195 gdb_regs[KGDB_REG_A3 ] = regs->tf_regs[FRAME_A3];
196 gdb_regs[KGDB_REG_A4 ] = regs->tf_regs[FRAME_A4];
197 gdb_regs[KGDB_REG_A5 ] = regs->tf_regs[FRAME_A5];
198 gdb_regs[KGDB_REG_T8 ] = regs->tf_regs[FRAME_T8];
199 gdb_regs[KGDB_REG_T9 ] = regs->tf_regs[FRAME_T9];
200 gdb_regs[KGDB_REG_T10] = regs->tf_regs[FRAME_T10];
201 gdb_regs[KGDB_REG_T11] = regs->tf_regs[FRAME_T11];
202 gdb_regs[KGDB_REG_RA ] = regs->tf_regs[FRAME_RA];
203 gdb_regs[KGDB_REG_T12] = regs->tf_regs[FRAME_T12];
204 gdb_regs[KGDB_REG_AT ] = regs->tf_regs[FRAME_AT];
205 gdb_regs[KGDB_REG_GP ] = regs->tf_regs[FRAME_GP];
206 gdb_regs[KGDB_REG_SP ] = regs->tf_regs[FRAME_SP];
207 gdb_regs[KGDB_REG_PC ] = regs->tf_regs[FRAME_PC];
208 }
209
210 /*
211 * kgdb_setregs:
212 *
213 * Translate the GDB register format into the kernel
214 * debugger register format.
215 */
216 void
kgdb_setregs(db_regs_t * regs,kgdb_reg_t * gdb_regs)217 kgdb_setregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
218 {
219
220 regs->tf_regs[FRAME_V0 ] = gdb_regs[KGDB_REG_V0];
221 regs->tf_regs[FRAME_T0 ] = gdb_regs[KGDB_REG_T0];
222 regs->tf_regs[FRAME_T1 ] = gdb_regs[KGDB_REG_T1];
223 regs->tf_regs[FRAME_T2 ] = gdb_regs[KGDB_REG_T2];
224 regs->tf_regs[FRAME_T3 ] = gdb_regs[KGDB_REG_T3];
225 regs->tf_regs[FRAME_T4 ] = gdb_regs[KGDB_REG_T4];
226 regs->tf_regs[FRAME_T5 ] = gdb_regs[KGDB_REG_T5];
227 regs->tf_regs[FRAME_T6 ] = gdb_regs[KGDB_REG_T6];
228 regs->tf_regs[FRAME_T7 ] = gdb_regs[KGDB_REG_T7];
229 regs->tf_regs[FRAME_S0 ] = gdb_regs[KGDB_REG_S0];
230 regs->tf_regs[FRAME_S1 ] = gdb_regs[KGDB_REG_S1];
231 regs->tf_regs[FRAME_S2 ] = gdb_regs[KGDB_REG_S2];
232 regs->tf_regs[FRAME_S3 ] = gdb_regs[KGDB_REG_S3];
233 regs->tf_regs[FRAME_S4 ] = gdb_regs[KGDB_REG_S4];
234 regs->tf_regs[FRAME_S5 ] = gdb_regs[KGDB_REG_S5];
235 regs->tf_regs[FRAME_S6 ] = gdb_regs[KGDB_REG_S6];
236 regs->tf_regs[FRAME_A0 ] = gdb_regs[KGDB_REG_A0];
237 regs->tf_regs[FRAME_A1 ] = gdb_regs[KGDB_REG_A1];
238 regs->tf_regs[FRAME_A2 ] = gdb_regs[KGDB_REG_A2];
239 regs->tf_regs[FRAME_A3 ] = gdb_regs[KGDB_REG_A3];
240 regs->tf_regs[FRAME_A4 ] = gdb_regs[KGDB_REG_A4];
241 regs->tf_regs[FRAME_A5 ] = gdb_regs[KGDB_REG_A5];
242 regs->tf_regs[FRAME_T8 ] = gdb_regs[KGDB_REG_T8];
243 regs->tf_regs[FRAME_T9 ] = gdb_regs[KGDB_REG_T9];
244 regs->tf_regs[FRAME_T10] = gdb_regs[KGDB_REG_T10];
245 regs->tf_regs[FRAME_T11] = gdb_regs[KGDB_REG_T11];
246 regs->tf_regs[FRAME_RA ] = gdb_regs[KGDB_REG_RA];
247 regs->tf_regs[FRAME_T12] = gdb_regs[KGDB_REG_T12];
248 regs->tf_regs[FRAME_AT ] = gdb_regs[KGDB_REG_AT];
249 regs->tf_regs[FRAME_GP ] = gdb_regs[KGDB_REG_GP];
250 regs->tf_regs[FRAME_SP ] = gdb_regs[KGDB_REG_SP];
251 regs->tf_regs[FRAME_PC ] = gdb_regs[KGDB_REG_PC];
252 }
253
254 /*
255 * kgdb_connect:
256 *
257 * Trap into KGDB and wait for the remote debugger to
258 * connect. Display a message on the console indicating
259 * why nothing else is happening.
260 */
261 void
kgdb_connect(int verbose)262 kgdb_connect(int verbose)
263 {
264
265 if (kgdb_dev == NODEV)
266 return;
267
268 if (verbose)
269 printf("kgdb waiting...");
270
271 __asm volatile("call_pal 0x81"); /* bugchk */
272
273 if (verbose)
274 printf("connected.\n");
275
276 kgdb_debug_panic = 1;
277 }
278
279 /*
280 * kgdb_panic:
281 *
282 * Decide what to do on panic. (This is called by panic(),
283 * like Debugger().)
284 */
285 void
kgdb_panic(void)286 kgdb_panic(void)
287 {
288 if (kgdb_dev != NODEV && kgdb_debug_panic) {
289 printf("entering kgdb\n");
290 kgdb_connect(kgdb_active == 0);
291 }
292 }
293