FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/db_trace.c
1 /* $NetBSD: db_trace.c,v 1.8 2003/01/17 22:28:48 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2000, 2001 Ben Harris
5 * Copyright (c) 1996 Scott K. Stevens
6 *
7 * Mach Operating System
8 * Copyright (c) 1991,1990 Carnegie Mellon University
9 * All Rights Reserved.
10 *
11 * Permission to use, copy, modify and distribute this software and its
12 * documentation is hereby granted, provided that both the copyright
13 * notice and this permission notice appear in all copies of the
14 * software, derivative works or modified versions, and any portions
15 * thereof, and that both notices appear in supporting documentation.
16 *
17 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
18 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
19 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
20 *
21 * Carnegie Mellon requests users of this software to return to
22 *
23 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
24 * School of Computer Science
25 * Carnegie Mellon University
26 * Pittsburgh PA 15213-3890
27 *
28 * any improvements or extensions that they make and grant Carnegie the
29 * rights to redistribute these changes.
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: src/sys/arm/arm/db_trace.c,v 1.14 2007/12/02 20:40:31 rwatson Exp $");
34 #include <sys/param.h>
35 #include <sys/systm.h>
36
37
38 #include <sys/proc.h>
39 #include <sys/kdb.h>
40 #include <sys/stack.h>
41 #include <machine/armreg.h>
42 #include <machine/asm.h>
43 #include <machine/cpufunc.h>
44 #include <machine/db_machdep.h>
45 #include <machine/pcb.h>
46 #include <machine/stack.h>
47 #include <machine/vmparam.h>
48 #include <ddb/ddb.h>
49 #include <ddb/db_access.h>
50 #include <ddb/db_sym.h>
51 #include <ddb/db_output.h>
52
53 /*
54 * APCS stack frames are awkward beasts, so I don't think even trying to use
55 * a structure to represent them is a good idea.
56 *
57 * Here's the diagram from the APCS. Increasing address is _up_ the page.
58 *
59 * save code pointer [fp] <- fp points to here
60 * return link value [fp, #-4]
61 * return sp value [fp, #-8]
62 * return fp value [fp, #-12]
63 * [saved v7 value]
64 * [saved v6 value]
65 * [saved v5 value]
66 * [saved v4 value]
67 * [saved v3 value]
68 * [saved v2 value]
69 * [saved v1 value]
70 * [saved a4 value]
71 * [saved a3 value]
72 * [saved a2 value]
73 * [saved a1 value]
74 *
75 * The save code pointer points twelve bytes beyond the start of the
76 * code sequence (usually a single STM) that created the stack frame.
77 * We have to disassemble it if we want to know which of the optional
78 * fields are actually present.
79 */
80
81 static void
82 db_stack_trace_cmd(db_expr_t addr, db_expr_t count)
83 {
84 u_int32_t *frame, *lastframe;
85 c_db_sym_t sym;
86 const char *name;
87 db_expr_t value;
88 db_expr_t offset;
89 boolean_t kernel_only = TRUE;
90 int scp_offset;
91
92 frame = (u_int32_t *)addr;
93 lastframe = NULL;
94 scp_offset = -(get_pc_str_offset() >> 2);
95
96 while (count-- && frame != NULL && !db_pager_quit) {
97 db_addr_t scp;
98 u_int32_t savecode;
99 int r;
100 u_int32_t *rp;
101 const char *sep;
102
103 /*
104 * In theory, the SCP isn't guaranteed to be in the function
105 * that generated the stack frame. We hope for the best.
106 */
107 scp = frame[FR_SCP];
108
109 sym = db_search_symbol(scp, DB_STGY_ANY, &offset);
110 if (sym == C_DB_SYM_NULL) {
111 value = 0;
112 name = "(null)";
113 } else
114 db_symbol_values(sym, &name, &value);
115 db_printf("%s() at ", name);
116 db_printsym(scp, DB_STGY_PROC);
117 db_printf("\n");
118 #ifdef __PROG26
119 db_printf("scp=0x%08x rlv=0x%08x (", scp, frame[FR_RLV] & R15_PC);
120 db_printsym(frame[FR_RLV] & R15_PC, DB_STGY_PROC);
121 db_printf(")\n");
122 #else
123 db_printf("scp=0x%08x rlv=0x%08x (", scp, frame[FR_RLV]);
124 db_printsym(frame[FR_RLV], DB_STGY_PROC);
125 db_printf(")\n");
126 #endif
127 db_printf("\trsp=0x%08x rfp=0x%08x", frame[FR_RSP], frame[FR_RFP]);
128
129 savecode = ((u_int32_t *)scp)[scp_offset];
130 if ((savecode & 0x0e100000) == 0x08000000) {
131 /* Looks like an STM */
132 rp = frame - 4;
133 sep = "\n\t";
134 for (r = 10; r >= 0; r--) {
135 if (savecode & (1 << r)) {
136 db_printf("%sr%d=0x%08x",
137 sep, r, *rp--);
138 sep = (frame - rp) % 4 == 2 ?
139 "\n\t" : " ";
140 }
141 }
142 }
143
144 db_printf("\n");
145
146 /*
147 * Switch to next frame up
148 */
149 if (frame[FR_RFP] == 0)
150 break; /* Top of stack */
151
152 lastframe = frame;
153 frame = (u_int32_t *)(frame[FR_RFP]);
154
155 if (INKERNEL((int)frame)) {
156 /* staying in kernel */
157 if (frame <= lastframe) {
158 db_printf("Bad frame pointer: %p\n", frame);
159 break;
160 }
161 } else if (INKERNEL((int)lastframe)) {
162 /* switch from user to kernel */
163 if (kernel_only)
164 break; /* kernel stack only */
165 } else {
166 /* in user */
167 if (frame <= lastframe) {
168 db_printf("Bad user frame pointer: %p\n",
169 frame);
170 break;
171 }
172 }
173 }
174 }
175
176 /* XXX stubs */
177 void
178 db_md_list_watchpoints()
179 {
180 }
181
182 int
183 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
184 {
185 return (0);
186 }
187
188 int
189 db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
190 {
191 return (0);
192 }
193
194 int
195 db_trace_thread(struct thread *thr, int count)
196 {
197 uint32_t addr;
198
199 if (thr == curthread)
200 addr = (uint32_t)__builtin_frame_address(0);
201 else
202 addr = thr->td_pcb->un_32.pcb32_r11;
203 db_stack_trace_cmd(addr, -1);
204 return (0);
205 }
206
207 void
208 db_trace_self(void)
209 {
210 db_trace_thread(curthread, -1);
211 }
212 Cache object: 7160511f093fdffc0dd1d352c53ff0cb
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