1 /* $NetBSD: kgdb_machdep.c,v 1.17 2009/11/21 17:40:28 rmind Exp $ */
2
3 /*-
4 * Copyright (c) 1997, 2002 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 of the Numerical Aerospace Simulation Facility,
9 * NASA Ames Research Center.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*
34 * Copyright (c) 1996 Matthias Pfaller.
35 * All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 *
46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
47 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
48 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
49 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
50 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
51 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
52 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
53 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
54 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
55 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
56 */
57
58 #include <sys/cdefs.h>
59 __KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.17 2009/11/21 17:40:28 rmind Exp $");
60
61 #include "opt_ddb.h"
62
63 #if defined(DDB)
64 #error "Can't build DDB and KGDB together."
65 #endif
66
67 /*
68 * Machine-dependent functions for remote KGDB. Originally written
69 * for NetBSD/pc532 by Matthias Pfaller. Modified for NetBSD/i386
70 * by Jason R. Thorpe. Modified for NetBSD/mips by Ethan Solomita.
71 * Modified for NetBSD/sh3 by UCHIYAMA Yasushi.
72 */
73
74 #include <sys/types.h>
75 #include <sys/systm.h>
76 #include <sys/param.h>
77 #include <sys/proc.h>
78 #include <sys/reboot.h>
79 #include <sys/kgdb.h>
80
81 #include <uvm/uvm_extern.h>
82
83 #include <sh3/cpu.h>
84
85 #include <machine/db_machdep.h>
86 #include <ddb/db_access.h>
87
88 /*
89 * Is kva a valid address to access? This is used by KGDB.
90 */
91 static int
kvacc(vaddr_t kva)92 kvacc(vaddr_t kva)
93 {
94 pt_entry_t *pte;
95
96 if (kva < SH3_P1SEG_BASE)
97 return (0);
98
99 if (kva < SH3_P2SEG_BASE)
100 return (1);
101
102 if (kva >= VM_MAX_KERNEL_ADDRESS)
103 return (0);
104
105 /* check kva is kernel virtual. */
106 if ((kva < VM_MIN_KERNEL_ADDRESS) ||
107 (kva >= VM_MAX_KERNEL_ADDRESS))
108 return (0);
109
110 /* check page which related kva is valid. */
111 pte = __pmap_kpte_lookup(kva);
112 if (!(*pte & PG_V))
113 return (0);
114
115 return (1);
116 }
117
118 /*
119 * Determine if the memory at va..(va+len) is valid.
120 */
121 int
kgdb_acc(vaddr_t va,size_t len)122 kgdb_acc(vaddr_t va, size_t len)
123 {
124 vaddr_t last_va;
125
126 last_va = va + len + PAGE_SIZE - 1;
127 va &= ~PGOFSET;
128 last_va &= ~PGOFSET;
129
130 for (; va < last_va; va += PAGE_SIZE) {
131 if (kvacc(va) == 0)
132 return 0;
133 }
134
135 return (1);
136 }
137
138 /*
139 * Translate a trap number into a unix compatible signal value.
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 EXPEVT_TLB_MISS_LD:
148 case EXPEVT_TLB_MISS_ST:
149 case EXPEVT_TLB_MOD:
150 case EXPEVT_TLB_PROT_LD:
151 case EXPEVT_TLB_PROT_ST:
152 case EXPEVT_ADDR_ERR_LD:
153 case EXPEVT_ADDR_ERR_ST:
154 case EXPEVT_TLB_MISS_LD | EXP_USER:
155 case EXPEVT_TLB_MISS_ST | EXP_USER:
156 case EXPEVT_TLB_MOD | EXP_USER:
157 case EXPEVT_TLB_PROT_LD | EXP_USER:
158 case EXPEVT_TLB_PROT_ST | EXP_USER:
159 case EXPEVT_ADDR_ERR_LD | EXP_USER:
160 case EXPEVT_ADDR_ERR_ST | EXP_USER:
161 return (SIGSEGV);
162
163 case EXPEVT_TRAPA:
164 case EXPEVT_BREAK:
165 case EXPEVT_TRAPA | EXP_USER:
166 case EXPEVT_BREAK | EXP_USER:
167 return (SIGTRAP);
168
169 case EXPEVT_RES_INST:
170 case EXPEVT_SLOT_INST:
171 case EXPEVT_RES_INST | EXP_USER:
172 case EXPEVT_SLOT_INST | EXP_USER:
173 return (SIGILL);
174
175 default:
176 return (SIGEMT);
177 }
178 }
179
180 /*
181 * Translate the values stored in the db_regs_t struct to the format
182 * understood by gdb. (gdb-5.1.1/gdb/config/sh/tm-sh.h)
183 */
184 void
kgdb_getregs(db_regs_t * regs,kgdb_reg_t * gdb_regs)185 kgdb_getregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
186 {
187 uint32_t r;
188
189 memset(gdb_regs, 0, KGDB_NUMREGS * sizeof(kgdb_reg_t));
190 gdb_regs[ 0] = regs->tf_r0;
191 gdb_regs[ 1] = regs->tf_r1;
192 gdb_regs[ 2] = regs->tf_r2;
193 gdb_regs[ 3] = regs->tf_r3;
194 gdb_regs[ 4] = regs->tf_r4;
195 gdb_regs[ 5] = regs->tf_r5;
196 gdb_regs[ 6] = regs->tf_r6;
197 gdb_regs[ 7] = regs->tf_r7;
198 gdb_regs[ 8] = regs->tf_r8;
199 gdb_regs[ 9] = regs->tf_r9;
200 gdb_regs[10] = regs->tf_r10;
201 gdb_regs[11] = regs->tf_r11;
202 gdb_regs[12] = regs->tf_r12;
203 gdb_regs[13] = regs->tf_r13;
204 gdb_regs[14] = regs->tf_r14;
205 gdb_regs[15] = regs->tf_r15;
206 gdb_regs[16] = regs->tf_spc;
207 gdb_regs[17] = regs->tf_pr;
208 __asm volatile("stc vbr, %0" : "=r"(r));
209 gdb_regs[19] = r;
210 gdb_regs[20] = regs->tf_mach;
211 gdb_regs[21] = regs->tf_macl;
212 gdb_regs[22] = regs->tf_ssr;
213
214 /* How treat register bank 1 ? */
215 }
216
217 /*
218 * Reverse the above.
219 */
220 void
kgdb_setregs(db_regs_t * regs,kgdb_reg_t * gdb_regs)221 kgdb_setregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
222 {
223
224 regs->tf_r0 = gdb_regs[ 0];
225 regs->tf_r1 = gdb_regs[ 1];
226 regs->tf_r2 = gdb_regs[ 2];
227 regs->tf_r3 = gdb_regs[ 3];
228 regs->tf_r4 = gdb_regs[ 4];
229 regs->tf_r5 = gdb_regs[ 5];
230 regs->tf_r6 = gdb_regs[ 6];
231 regs->tf_r7 = gdb_regs[ 7];
232 regs->tf_r8 = gdb_regs[ 8];
233 regs->tf_r9 = gdb_regs[ 9];
234 regs->tf_r10 = gdb_regs[10];
235 regs->tf_r11 = gdb_regs[11];
236 regs->tf_r12 = gdb_regs[12];
237 regs->tf_r13 = gdb_regs[13];
238 regs->tf_r14 = gdb_regs[14];
239 regs->tf_r15 = gdb_regs[15];
240 regs->tf_spc = gdb_regs[16];
241 regs->tf_pr = gdb_regs[17];
242 __asm volatile("ldc %0, vbr" :: "r"(gdb_regs[19]));
243 regs->tf_mach = gdb_regs[20];
244 regs->tf_macl = gdb_regs[21];
245 regs->tf_ssr = gdb_regs[22];
246 }
247
248 /*
249 * Trap into kgdb to wait for debugger to connect,
250 * noting on the console why nothing else is going on.
251 */
252 void
kgdb_connect(int verbose)253 kgdb_connect(int verbose)
254 {
255
256 if (kgdb_dev == NODEV) {
257 printf("kgdb_dev=%"PRId64"\n", kgdb_dev);
258 return;
259 }
260
261 if (verbose)
262 printf("kgdb waiting...");
263
264 __asm volatile("trapa %0" :: "i"(_SH_TRA_BREAK));
265
266 if (verbose)
267 printf("connected.\n");
268
269 kgdb_debug_panic = 1;
270 }
271
272 /*
273 * Decide what to do on panic.
274 * (This is called by panic, like Debugger())
275 */
276 void
kgdb_panic(void)277 kgdb_panic(void)
278 {
279
280 if (kgdb_dev != NODEV && kgdb_debug_panic) {
281 printf("entering kgdb\n");
282 kgdb_connect(kgdb_active == 0);
283 }
284 }
285