1 /* $FreeBSD$ */
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 struct db_variable db_regs[] = {
57 { "r0", DB_OFFSET(fixreg[0]), db_frame },
58 { "r1", DB_OFFSET(fixreg[1]), db_frame },
59 { "r2", DB_OFFSET(fixreg[2]), db_frame },
60 { "r3", DB_OFFSET(fixreg[3]), db_frame },
61 { "r4", DB_OFFSET(fixreg[4]), db_frame },
62 { "r5", DB_OFFSET(fixreg[5]), db_frame },
63 { "r6", DB_OFFSET(fixreg[6]), db_frame },
64 { "r7", DB_OFFSET(fixreg[7]), db_frame },
65 { "r8", DB_OFFSET(fixreg[8]), db_frame },
66 { "r9", DB_OFFSET(fixreg[9]), db_frame },
67 { "r10", DB_OFFSET(fixreg[10]), db_frame },
68 { "r11", DB_OFFSET(fixreg[11]), db_frame },
69 { "r12", DB_OFFSET(fixreg[12]), db_frame },
70 { "r13", DB_OFFSET(fixreg[13]), db_frame },
71 { "r14", DB_OFFSET(fixreg[14]), db_frame },
72 { "r15", DB_OFFSET(fixreg[15]), db_frame },
73 { "r16", DB_OFFSET(fixreg[16]), db_frame },
74 { "r17", DB_OFFSET(fixreg[17]), db_frame },
75 { "r18", DB_OFFSET(fixreg[18]), db_frame },
76 { "r19", DB_OFFSET(fixreg[19]), db_frame },
77 { "r20", DB_OFFSET(fixreg[20]), db_frame },
78 { "r21", DB_OFFSET(fixreg[21]), db_frame },
79 { "r22", DB_OFFSET(fixreg[22]), db_frame },
80 { "r23", DB_OFFSET(fixreg[23]), db_frame },
81 { "r24", DB_OFFSET(fixreg[24]), db_frame },
82 { "r25", DB_OFFSET(fixreg[25]), db_frame },
83 { "r26", DB_OFFSET(fixreg[26]), db_frame },
84 { "r27", DB_OFFSET(fixreg[27]), db_frame },
85 { "r28", DB_OFFSET(fixreg[28]), db_frame },
86 { "r29", DB_OFFSET(fixreg[29]), db_frame },
87 { "r30", DB_OFFSET(fixreg[30]), db_frame },
88 { "r31", DB_OFFSET(fixreg[31]), db_frame },
89 { "srr0", DB_OFFSET(srr0), db_frame },
90 { "srr1", DB_OFFSET(srr1), db_frame },
91 { "lr", DB_OFFSET(lr), db_frame },
92 { "ctr", DB_OFFSET(ctr), db_frame },
93 { "cr", DB_OFFSET(cr), db_frame },
94 { "xer", DB_OFFSET(xer), db_frame },
95 { "dar", DB_OFFSET(dar), db_frame },
96 { "dsisr", DB_OFFSET(dsisr), db_frame },
97 };
98 struct db_variable *db_eregs = db_regs + sizeof (db_regs)/sizeof (db_regs[0]);
99
100 /*
101 * register variable handling
102 */
103 static int
104 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
105 {
106 uint32_t *reg;
107
108 if (kdb_frame == NULL)
109 return (0);
110 reg = (uint32_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep);
111 if (op == DB_VAR_GET)
112 *valuep = *reg;
113 else
114 *reg = *valuep;
115 return (1);
116 }
117
118
119 /*
120 * Frame tracing.
121 */
122 static int
123 db_backtrace(struct thread *td, db_addr_t fp, int count)
124 {
125 db_addr_t stackframe, lr, *args;
126 db_expr_t diff;
127 c_db_sym_t sym;
128 const char *symname;
129 boolean_t kernel_only = TRUE;
130 boolean_t full = FALSE;
131
132 #if 0
133 {
134 register char *cp = modif;
135 register char c;
136
137 while ((c = *cp++) != 0) {
138 if (c == 't')
139 trace_thread = TRUE;
140 if (c == 'u')
141 kernel_only = FALSE;
142 if (c == 'f')
143 full = TRUE;
144 }
145 }
146 #endif
147
148 stackframe = fp;
149
150 while (!db_pager_quit) {
151 if (stackframe < PAGE_SIZE)
152 break;
153
154 /*
155 * Locate the next frame by grabbing the backchain ptr
156 * from frame[0]
157 */
158 stackframe = *(db_addr_t *)stackframe;
159
160 next_frame:
161 /* The saved arg values start at frame[2] */
162 args = (db_addr_t *)(stackframe + 8);
163
164 if (stackframe < PAGE_SIZE)
165 break;
166
167 if (count-- == 0)
168 break;
169
170 /*
171 * Extract link register from frame and subtract
172 * 4 to convert into calling address (as opposed to
173 * return address)
174 */
175 lr = *(db_addr_t *)(stackframe + 4) - 4;
176 if ((lr & 3) || (lr < 0x100)) {
177 db_printf("saved LR(0x%x) is invalid.", lr);
178 break;
179 }
180
181 db_printf("0x%08x: ", stackframe);
182
183 /*
184 * The trap code labels the return addresses from the
185 * call to C code as 'trapexit' and 'asttrapexit. Use this
186 * to determine if the callframe has to traverse a saved
187 * trap context
188 */
189 if ((lr + 4 == (db_addr_t) &trapexit) ||
190 (lr + 4 == (db_addr_t) &asttrapexit)) {
191 const char *trapstr;
192 struct trapframe *tf = (struct trapframe *)
193 (stackframe+8);
194 db_printf("%s ", tf->srr1 & PSL_PR ? "user" : "kernel");
195 switch (tf->exc) {
196 case EXC_DSI:
197 db_printf("DSI %s trap @ %#x by ",
198 tf->dsisr & DSISR_STORE ? "write" : "read",
199 tf->dar);
200 goto print_trap;
201 case EXC_ALI:
202 db_printf("ALI trap @ %#x (DSISR %#x) ",
203 tf->dar, tf->dsisr);
204 goto print_trap;
205 case EXC_ISI: trapstr = "ISI"; break;
206 case EXC_PGM: trapstr = "PGM"; break;
207 case EXC_SC: trapstr = "SC"; break;
208 case EXC_EXI: trapstr = "EXI"; break;
209 case EXC_MCHK: trapstr = "MCHK"; break;
210 case EXC_VEC: trapstr = "VEC"; break;
211 case EXC_FPU: trapstr = "FPU"; break;
212 case EXC_FPA: trapstr = "FPA"; break;
213 case EXC_DECR: trapstr = "DECR"; break;
214 case EXC_BPT: trapstr = "BPT"; break;
215 case EXC_TRC: trapstr = "TRC"; break;
216 case EXC_RUNMODETRC: trapstr = "RUNMODETRC"; break;
217 case EXC_PERF: trapstr = "PERF"; break;
218 case EXC_SMI: trapstr = "SMI"; break;
219 case EXC_RST: trapstr = "RST"; break;
220 default: trapstr = NULL; break;
221 }
222 if (trapstr != NULL) {
223 db_printf("%s trap by ", trapstr);
224 } else {
225 db_printf("trap %#x by ", tf->exc);
226 }
227
228 print_trap:
229 lr = (db_addr_t) tf->srr0;
230 diff = 0;
231 symname = NULL;
232 sym = db_search_symbol(lr, DB_STGY_ANY, &diff);
233 db_symbol_values(sym, &symname, 0);
234 if (symname == NULL || !strcmp(symname, "end")) {
235 db_printf("%#x: srr1=%#x\n", lr, tf->srr1);
236 } else {
237 db_printf("%s+%#x: srr1=%#x\n", symname, diff,
238 tf->srr1);
239 }
240 db_printf("%-10s r1=%#x cr=%#x xer=%#x ctr=%#x",
241 "", tf->fixreg[1], tf->cr, tf->xer, tf->ctr);
242 if (tf->exc == EXC_DSI)
243 db_printf(" dsisr=%#x", tf->dsisr);
244 db_printf("\n");
245 stackframe = (db_addr_t) tf->fixreg[1];
246 if (kernel_only && (tf->srr1 & PSL_PR))
247 break;
248 goto next_frame;
249 }
250
251 diff = 0;
252 symname = NULL;
253 sym = db_search_symbol(lr, DB_STGY_ANY, &diff);
254 db_symbol_values(sym, &symname, 0);
255 if (symname == NULL || !strcmp(symname, "end"))
256 db_printf("at %x", lr);
257 else
258 db_printf("at %s+%#x", symname, diff);
259 if (full)
260 /* Print all the args stored in that stackframe. */
261 db_printf("(%x, %x, %x, %x, %x, %x, %x, %x)",
262 args[0], args[1], args[2], args[3],
263 args[4], args[5], args[6], args[7]);
264 db_printf("\n");
265 }
266
267 return (0);
268 }
269
270 void
271 db_trace_self(void)
272 {
273 db_addr_t addr;
274
275 addr = (db_addr_t)__builtin_frame_address(1);
276 db_backtrace(curthread, addr, -1);
277 }
278
279 int
280 db_trace_thread(struct thread *td, int count)
281 {
282 struct pcb *ctx;
283
284 ctx = kdb_thr_ctx(td);
285 return (db_backtrace(td, (db_addr_t)ctx->pcb_sp, count));
286 }
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