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 $ */
6 * Mach Operating System
7 * Copyright (c) 1992 Carnegie Mellon University
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.
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.
20 * Carnegie Mellon requests users of this software to return to
22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
23 * School of Computer Science
24 * Carnegie Mellon University
25 * Pittsburgh PA 15213-3890
27 * any improvements or extensions that they make and grant Carnegie Mellon
28 * the rights to redistribute these changes.
31 #include <sys/param.h>
32 #include <sys/systm.h>
35 #include <sys/stack.h>
39 #include <vm/vm_extern.h>
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>
48 #include <ddb/db_access.h>
49 #include <ddb/db_sym.h>
50 #include <ddb/db_variables.h>
52 static db_varfcn_t db_frame;
54 #define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x)
57 #define CALLOFFSET 8 /* Include TOC reload slot */
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 },
102 { "dar", DB_OFFSET(cpu.aim.dar), db_frame },
103 { "dsisr", DB_OFFSET(cpu.aim.dsisr), db_frame },
106 { "dear", DB_OFFSET(cpu.booke.dear), db_frame },
107 { "esr", DB_OFFSET(cpu.booke.esr), db_frame },
110 struct db_variable *db_eregs = db_regs + sizeof (db_regs)/sizeof (db_regs[0]);
113 * register variable handling
116 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
120 if (kdb_frame == NULL)
122 reg = (register_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep);
123 if (op == DB_VAR_GET)
135 db_backtrace(struct thread *td, db_addr_t fp, int count)
137 db_addr_t stackframe, lr, *args;
141 boolean_t kernel_only = TRUE;
142 boolean_t full = FALSE;
146 register char *cp = modif;
149 while ((c = *cp++) != 0) {
162 while (!db_pager_quit) {
163 if (stackframe < PAGE_SIZE)
167 * Locate the next frame by grabbing the backchain ptr
170 stackframe = *(db_addr_t *)stackframe;
174 /* The saved arg values start at frame[6] */
175 args = (db_addr_t *)(stackframe + 48);
177 /* The saved arg values start at frame[2] */
178 args = (db_addr_t *)(stackframe + 8);
181 if (stackframe < PAGE_SIZE)
188 * Extract link register from frame and subtract
189 * 4 to convert into calling address (as opposed to
193 lr = *(db_addr_t *)(stackframe + 16) - 4;
195 lr = *(db_addr_t *)(stackframe + 4) - 4;
197 if ((lr & 3) || (lr < 0x100)) {
198 db_printf("saved LR(0x%zx) is invalid.", lr);
203 db_printf("0x%016lx: ", stackframe);
205 db_printf("0x%08x: ", stackframe);
209 * The trap code labels the return addresses from the
210 * call to C code as 'trapexit' and 'asttrapexit. Use this
211 * to determine if the callframe has to traverse a saved
214 if ((lr + CALLOFFSET == (db_addr_t) &trapexit) ||
215 (lr + CALLOFFSET == (db_addr_t) &asttrapexit)) {
217 struct trapframe *tf = (struct trapframe *)(args);
218 db_printf("%s ", tf->srr1 & PSL_PR ? "user" : "kernel");
221 /* XXX take advantage of the union. */
222 db_printf("DSI %s trap @ %#zx by ",
223 (tf->cpu.aim.dsisr & DSISR_STORE) ? "write"
224 : "read", tf->cpu.aim.dar);
227 /* XXX take advantage of the union. */
228 db_printf("ALI trap @ %#zx (xSR %#x) ",
230 (uint32_t)tf->cpu.aim.dsisr);
234 db_printf("DSE trap @ %#zx by ",
238 db_printf("ISE trap @ %#zx by ", tf->srr0);
241 case EXC_ISI: trapstr = "ISI"; break;
242 case EXC_PGM: trapstr = "PGM"; break;
243 case EXC_SC: trapstr = "SC"; break;
244 case EXC_EXI: trapstr = "EXI"; break;
245 case EXC_MCHK: trapstr = "MCHK"; break;
247 case EXC_VEC: trapstr = "VEC"; break;
248 case EXC_FPA: trapstr = "FPA"; break;
249 case EXC_BPT: trapstr = "BPT"; break;
250 case EXC_TRC: trapstr = "TRC"; break;
251 case EXC_RUNMODETRC: trapstr = "RUNMODETRC"; break;
252 case EXC_SMI: trapstr = "SMI"; break;
253 case EXC_RST: trapstr = "RST"; break;
255 case EXC_FPU: trapstr = "FPU"; break;
256 case EXC_DECR: trapstr = "DECR"; break;
257 case EXC_PERF: trapstr = "PERF"; break;
258 default: trapstr = NULL; break;
260 if (trapstr != NULL) {
261 db_printf("%s trap by ", trapstr);
263 db_printf("trap %#zx by ", tf->exc);
267 lr = (db_addr_t) tf->srr0;
270 sym = db_search_symbol(lr, DB_STGY_ANY, &diff);
271 db_symbol_values(sym, &symname, 0);
272 if (symname == NULL || !strcmp(symname, "end")) {
273 db_printf("%#zx: srr1=%#zx\n", lr, tf->srr1);
275 db_printf("%s+%#zx: srr1=%#zx\n", symname, diff,
278 db_printf("%-10s r1=%#zx cr=%#x xer=%#x ctr=%#zx",
279 "", tf->fixreg[1], (uint32_t)tf->cr,
280 (uint32_t)tf->xer, tf->ctr);
281 if (tf->exc == EXC_DSI)
283 (uint32_t)tf->cpu.aim.dsisr);
285 stackframe = (db_addr_t) tf->fixreg[1];
286 if (kernel_only && (tf->srr1 & PSL_PR))
293 sym = db_search_symbol(lr, DB_STGY_ANY, &diff);
294 db_symbol_values(sym, &symname, 0);
295 if (symname == NULL || !strcmp(symname, "end"))
296 db_printf("at %zx", lr);
298 db_printf("at %s+%#zx", symname, diff);
300 /* Print all the args stored in that stackframe. */
301 db_printf("(%zx, %zx, %zx, %zx, %zx, %zx, %zx, %zx)",
302 args[0], args[1], args[2], args[3],
303 args[4], args[5], args[6], args[7]);
315 addr = (db_addr_t)__builtin_frame_address(1);
316 db_backtrace(curthread, addr, -1);
320 db_trace_thread(struct thread *td, int count)
324 ctx = kdb_thr_ctx(td);
325 return (db_backtrace(td, (db_addr_t)ctx->pcb_sp, count));