1 /* $FreeBSD: releng/11.0/sys/powerpc/powerpc/db_trace.c 298352 2016-04-20 15:45:55Z pfg $ */
2 /* $NetBSD: db_trace.c,v 1.20 2002/05/13 20:30:09 matt Exp $ */
3 /* $OpenBSD: db_trace.c,v 1.3 1997/03/21 02:10:48 niklas Exp $ */
4
5 /*-
6 * Mach Operating System
7 * Copyright (c) 1992 Carnegie Mellon University
8 * All Rights Reserved.
9 *
10 * Permission to use, copy, modify and distribute this software and its
11 * documentation is hereby granted, provided that both the copyright
12 * notice and this permission notice appear in all copies of the
13 * software, derivative works or modified versions, and any portions
14 * thereof, and that both notices appear in supporting documentation.
15 *
16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
18 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
19 *
20 * Carnegie Mellon requests users of this software to return to
21 *
22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
23 * School of Computer Science
24 * Carnegie Mellon University
25 * Pittsburgh PA 15213-3890
26 *
27 * any improvements or extensions that they make and grant Carnegie Mellon
28 * the rights to redistribute these changes.
29 */
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kdb.h>
34 #include <sys/proc.h>
35 #include <sys/stack.h>
36
37 #include <vm/vm.h>
38 #include <vm/pmap.h>
39 #include <vm/vm_extern.h>
40
41 #include <machine/db_machdep.h>
42 #include <machine/pcb.h>
43 #include <machine/spr.h>
44 #include <machine/stack.h>
45 #include <machine/trap.h>
46
47 #include <ddb/ddb.h>
48 #include <ddb/db_access.h>
49 #include <ddb/db_sym.h>
50 #include <ddb/db_variables.h>
51
52 static db_varfcn_t db_frame;
53
54 #define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x)
55
56 #ifdef __powerpc64__
57 #define CALLOFFSET 8 /* Include TOC reload slot */
58 #else
59 #define CALLOFFSET 4
60 #endif
61
62 struct db_variable db_regs[] = {
63 { "r0", DB_OFFSET(fixreg[0]), db_frame },
64 { "r1", DB_OFFSET(fixreg[1]), db_frame },
65 { "r2", DB_OFFSET(fixreg[2]), db_frame },
66 { "r3", DB_OFFSET(fixreg[3]), db_frame },
67 { "r4", DB_OFFSET(fixreg[4]), db_frame },
68 { "r5", DB_OFFSET(fixreg[5]), db_frame },
69 { "r6", DB_OFFSET(fixreg[6]), db_frame },
70 { "r7", DB_OFFSET(fixreg[7]), db_frame },
71 { "r8", DB_OFFSET(fixreg[8]), db_frame },
72 { "r9", DB_OFFSET(fixreg[9]), db_frame },
73 { "r10", DB_OFFSET(fixreg[10]), db_frame },
74 { "r11", DB_OFFSET(fixreg[11]), db_frame },
75 { "r12", DB_OFFSET(fixreg[12]), db_frame },
76 { "r13", DB_OFFSET(fixreg[13]), db_frame },
77 { "r14", DB_OFFSET(fixreg[14]), db_frame },
78 { "r15", DB_OFFSET(fixreg[15]), db_frame },
79 { "r16", DB_OFFSET(fixreg[16]), db_frame },
80 { "r17", DB_OFFSET(fixreg[17]), db_frame },
81 { "r18", DB_OFFSET(fixreg[18]), db_frame },
82 { "r19", DB_OFFSET(fixreg[19]), db_frame },
83 { "r20", DB_OFFSET(fixreg[20]), db_frame },
84 { "r21", DB_OFFSET(fixreg[21]), db_frame },
85 { "r22", DB_OFFSET(fixreg[22]), db_frame },
86 { "r23", DB_OFFSET(fixreg[23]), db_frame },
87 { "r24", DB_OFFSET(fixreg[24]), db_frame },
88 { "r25", DB_OFFSET(fixreg[25]), db_frame },
89 { "r26", DB_OFFSET(fixreg[26]), db_frame },
90 { "r27", DB_OFFSET(fixreg[27]), db_frame },
91 { "r28", DB_OFFSET(fixreg[28]), db_frame },
92 { "r29", DB_OFFSET(fixreg[29]), db_frame },
93 { "r30", DB_OFFSET(fixreg[30]), db_frame },
94 { "r31", DB_OFFSET(fixreg[31]), db_frame },
95 { "srr0", DB_OFFSET(srr0), db_frame },
96 { "srr1", DB_OFFSET(srr1), db_frame },
97 { "lr", DB_OFFSET(lr), db_frame },
98 { "ctr", DB_OFFSET(ctr), db_frame },
99 { "cr", DB_OFFSET(cr), db_frame },
100 { "xer", DB_OFFSET(xer), db_frame },
101 { "dar", DB_OFFSET(dar), db_frame },
102 #ifdef AIM
103 { "dsisr", DB_OFFSET(cpu.aim.dsisr), db_frame },
104 #endif
105 #if defined(BOOKE)
106 { "esr", DB_OFFSET(cpu.booke.esr), db_frame },
107 #endif
108 };
109 struct db_variable *db_eregs = db_regs + nitems(db_regs);
110
111 /*
112 * register variable handling
113 */
114 static int
115 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
116 {
117 register_t *reg;
118
119 if (kdb_frame == NULL)
120 return (0);
121 reg = (register_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep);
122 if (op == DB_VAR_GET)
123 *valuep = *reg;
124 else
125 *reg = *valuep;
126 return (1);
127 }
128
129
130 /*
131 * Frame tracing.
132 */
133 static int
134 db_backtrace(struct thread *td, db_addr_t fp, int count)
135 {
136 db_addr_t stackframe, lr, *args;
137 boolean_t kernel_only = TRUE;
138 boolean_t full = FALSE;
139
140 #if 0
141 {
142 register char *cp = modif;
143 register char c;
144
145 while ((c = *cp++) != 0) {
146 if (c == 't')
147 trace_thread = TRUE;
148 if (c == 'u')
149 kernel_only = FALSE;
150 if (c == 'f')
151 full = TRUE;
152 }
153 }
154 #endif
155
156 stackframe = fp;
157
158 while (!db_pager_quit) {
159 if (stackframe < PAGE_SIZE)
160 break;
161
162 /*
163 * Locate the next frame by grabbing the backchain ptr
164 * from frame[0]
165 */
166 stackframe = *(db_addr_t *)stackframe;
167
168 next_frame:
169 #ifdef __powerpc64__
170 /* The saved arg values start at frame[6] */
171 args = (db_addr_t *)(stackframe + 48);
172 #else
173 /* The saved arg values start at frame[2] */
174 args = (db_addr_t *)(stackframe + 8);
175 #endif
176
177 if (stackframe < PAGE_SIZE)
178 break;
179
180 if (count-- == 0)
181 break;
182
183 /*
184 * Extract link register from frame and subtract
185 * 4 to convert into calling address (as opposed to
186 * return address)
187 */
188 #ifdef __powerpc64__
189 lr = *(db_addr_t *)(stackframe + 16) - 4;
190 #else
191 lr = *(db_addr_t *)(stackframe + 4) - 4;
192 #endif
193 if ((lr & 3) || (lr < 0x100)) {
194 db_printf("saved LR(0x%zx) is invalid.", lr);
195 break;
196 }
197
198 #ifdef __powerpc64__
199 db_printf("0x%016lx: ", stackframe);
200 #else
201 db_printf("0x%08x: ", stackframe);
202 #endif
203
204 /*
205 * The trap code labels the return addresses from the
206 * call to C code as 'trapexit' and 'asttrapexit. Use this
207 * to determine if the callframe has to traverse a saved
208 * trap context
209 */
210 if ((lr + CALLOFFSET == (db_addr_t) &trapexit) ||
211 (lr + CALLOFFSET == (db_addr_t) &asttrapexit)) {
212 const char *trapstr;
213 struct trapframe *tf = (struct trapframe *)(args);
214 db_printf("%s ", tf->srr1 & PSL_PR ? "user" : "kernel");
215 switch (tf->exc) {
216 case EXC_DSI:
217 /* XXX take advantage of the union. */
218 db_printf("DSI %s trap @ %#zx by ",
219 (tf->cpu.aim.dsisr & DSISR_STORE) ? "write"
220 : "read", tf->dar);
221 goto print_trap;
222 case EXC_ALI:
223 /* XXX take advantage of the union. */
224 db_printf("ALI trap @ %#zx (xSR %#x) ",
225 tf->dar, (uint32_t)tf->cpu.aim.dsisr);
226 goto print_trap;
227 #ifdef __powerpc64__
228 case EXC_DSE:
229 db_printf("DSE trap @ %#zx by ", tf->dar);
230 goto print_trap;
231 case EXC_ISE:
232 db_printf("ISE trap @ %#zx by ", tf->srr0);
233 goto print_trap;
234 #endif
235 case EXC_ISI: trapstr = "ISI"; break;
236 case EXC_PGM: trapstr = "PGM"; break;
237 case EXC_SC: trapstr = "SC"; break;
238 case EXC_EXI: trapstr = "EXI"; break;
239 case EXC_MCHK: trapstr = "MCHK"; break;
240 #if !defined(BOOKE)
241 case EXC_VEC: trapstr = "VEC"; break;
242 case EXC_FPA: trapstr = "FPA"; break;
243 case EXC_BPT: trapstr = "BPT"; break;
244 case EXC_TRC: trapstr = "TRC"; break;
245 case EXC_RUNMODETRC: trapstr = "RUNMODETRC"; break;
246 case EXC_SMI: trapstr = "SMI"; break;
247 case EXC_RST: trapstr = "RST"; break;
248 #endif
249 case EXC_FPU: trapstr = "FPU"; break;
250 case EXC_DECR: trapstr = "DECR"; break;
251 case EXC_PERF: trapstr = "PERF"; break;
252 case EXC_VSX: trapstr = "VSX"; break;
253 default: trapstr = NULL; break;
254 }
255 if (trapstr != NULL) {
256 db_printf("%s trap by ", trapstr);
257 } else {
258 db_printf("trap %#zx by ", tf->exc);
259 }
260
261 print_trap:
262 lr = (db_addr_t) tf->srr0;
263 db_printsym(lr, DB_STGY_ANY);
264 db_printf(": srr1=%#zx\n", tf->srr1);
265 db_printf("%-10s r1=%#zx cr=%#x xer=%#x ctr=%#zx",
266 "", tf->fixreg[1], (uint32_t)tf->cr,
267 (uint32_t)tf->xer, tf->ctr);
268 #ifdef __powerpc64__
269 db_printf(" r2=%#zx", tf->fixreg[2]);
270 #endif
271 if (tf->exc == EXC_DSI)
272 db_printf(" sr=%#x",
273 (uint32_t)tf->cpu.aim.dsisr);
274 db_printf("\n");
275 stackframe = (db_addr_t) tf->fixreg[1];
276 if (kernel_only && (tf->srr1 & PSL_PR))
277 break;
278 goto next_frame;
279 }
280
281 db_printf("at ");
282 db_printsym(lr, DB_STGY_PROC);
283 if (full)
284 /* Print all the args stored in that stackframe. */
285 db_printf("(%zx, %zx, %zx, %zx, %zx, %zx, %zx, %zx)",
286 args[0], args[1], args[2], args[3],
287 args[4], args[5], args[6], args[7]);
288 db_printf("\n");
289 }
290
291 return (0);
292 }
293
294 void
295 db_trace_self(void)
296 {
297 db_addr_t addr;
298
299 addr = (db_addr_t)__builtin_frame_address(1);
300 db_backtrace(curthread, addr, -1);
301 }
302
303 int
304 db_trace_thread(struct thread *td, int count)
305 {
306 struct pcb *ctx;
307
308 ctx = kdb_thr_ctx(td);
309 return (db_backtrace(td, (db_addr_t)ctx->pcb_sp, count));
310 }
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