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: releng/6.0/sys/arm/arm/db_trace.c 139735 2005-01-05 21:58:49Z imp $");
34 #include <sys/param.h>
35 #include <sys/systm.h>
36
37
38 #include <sys/proc.h>
39 #include <sys/kdb.h>
40 #include <machine/armreg.h>
41 #include <machine/asm.h>
42 #include <machine/cpufunc.h>
43 #include <machine/db_machdep.h>
44 #include <machine/pcb.h>
45 #include <machine/vmparam.h>
46 #include <ddb/ddb.h>
47 #include <ddb/db_access.h>
48 #include <ddb/db_sym.h>
49 #include <ddb/db_output.h>
50
51 #define INKERNEL(va) (((vm_offset_t)(va)) >= VM_MIN_KERNEL_ADDRESS)
52
53 int db_md_set_watchpoint(db_expr_t addr, db_expr_t size);
54 int db_md_clr_watchpoint(db_expr_t addr, db_expr_t size);
55 void db_md_list_watchpoints(void);
56 /*
57 * APCS stack frames are awkward beasts, so I don't think even trying to use
58 * a structure to represent them is a good idea.
59 *
60 * Here's the diagram from the APCS. Increasing address is _up_ the page.
61 *
62 * save code pointer [fp] <- fp points to here
63 * return link value [fp, #-4]
64 * return sp value [fp, #-8]
65 * return fp value [fp, #-12]
66 * [saved v7 value]
67 * [saved v6 value]
68 * [saved v5 value]
69 * [saved v4 value]
70 * [saved v3 value]
71 * [saved v2 value]
72 * [saved v1 value]
73 * [saved a4 value]
74 * [saved a3 value]
75 * [saved a2 value]
76 * [saved a1 value]
77 *
78 * The save code pointer points twelve bytes beyond the start of the
79 * code sequence (usually a single STM) that created the stack frame.
80 * We have to disassemble it if we want to know which of the optional
81 * fields are actually present.
82 */
83
84 #define FR_SCP (0)
85 #define FR_RLV (-1)
86 #define FR_RSP (-2)
87 #define FR_RFP (-3)
88
89 static void
90 db_stack_trace_cmd(db_expr_t addr, db_expr_t count)
91 {
92 u_int32_t *frame, *lastframe;
93 c_db_sym_t sym;
94 const char *name;
95 db_expr_t value;
96 db_expr_t offset;
97 boolean_t kernel_only = TRUE;
98 int scp_offset, quit;
99
100 frame = (u_int32_t *)addr;
101 lastframe = NULL;
102 scp_offset = -(get_pc_str_offset() >> 2);
103
104 quit = 0;
105 db_setup_paging(db_simple_pager, &quit, db_lines_per_page);
106 while (count-- && frame != NULL && !quit) {
107 db_addr_t scp;
108 u_int32_t savecode;
109 int r;
110 u_int32_t *rp;
111 const char *sep;
112
113 /*
114 * In theory, the SCP isn't guaranteed to be in the function
115 * that generated the stack frame. We hope for the best.
116 */
117 scp = frame[FR_SCP];
118
119 sym = db_search_symbol(scp, DB_STGY_ANY, &offset);
120 if (sym == C_DB_SYM_NULL) {
121 value = 0;
122 name = "(null)";
123 } else
124 db_symbol_values(sym, &name, &value);
125 db_printf("%s() at ", name);
126 db_printsym(scp, DB_STGY_PROC);
127 db_printf("\n");
128 #ifdef __PROG26
129 db_printf("scp=0x%08x rlv=0x%08x (", scp, frame[FR_RLV] & R15_PC);
130 db_printsym(frame[FR_RLV] & R15_PC, DB_STGY_PROC);
131 db_printf(")\n");
132 #else
133 db_printf("scp=0x%08x rlv=0x%08x (", scp, frame[FR_RLV]);
134 db_printsym(frame[FR_RLV], DB_STGY_PROC);
135 db_printf(")\n");
136 #endif
137 db_printf("\trsp=0x%08x rfp=0x%08x", frame[FR_RSP], frame[FR_RFP]);
138
139 savecode = ((u_int32_t *)scp)[scp_offset];
140 if ((savecode & 0x0e100000) == 0x08000000) {
141 /* Looks like an STM */
142 rp = frame - 4;
143 sep = "\n\t";
144 for (r = 10; r >= 0; r--) {
145 if (savecode & (1 << r)) {
146 db_printf("%sr%d=0x%08x",
147 sep, r, *rp--);
148 sep = (frame - rp) % 4 == 2 ?
149 "\n\t" : " ";
150 }
151 }
152 }
153
154 db_printf("\n");
155
156 /*
157 * Switch to next frame up
158 */
159 if (frame[FR_RFP] == 0)
160 break; /* Top of stack */
161
162 lastframe = frame;
163 frame = (u_int32_t *)(frame[FR_RFP]);
164
165 if (INKERNEL((int)frame)) {
166 /* staying in kernel */
167 if (frame <= lastframe) {
168 db_printf("Bad frame pointer: %p\n", frame);
169 break;
170 }
171 } else if (INKERNEL((int)lastframe)) {
172 /* switch from user to kernel */
173 if (kernel_only)
174 break; /* kernel stack only */
175 } else {
176 /* in user */
177 if (frame <= lastframe) {
178 db_printf("Bad user frame pointer: %p\n",
179 frame);
180 break;
181 }
182 }
183 }
184 }
185
186 /* XXX stubs */
187 void
188 db_md_list_watchpoints()
189 {
190 }
191
192 int
193 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
194 {
195 return (0);
196 }
197
198 int
199 db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
200 {
201 return (0);
202 }
203
204 int
205 db_trace_thread(struct thread *thr, int count)
206 {
207 uint32_t addr;
208
209 if (thr == curthread)
210 addr = (uint32_t)__builtin_frame_address(0);
211 else
212 addr = thr->td_pcb->un_32.pcb32_r11;
213 db_stack_trace_cmd(addr, -1);
214 return (0);
215 }
216
217 void
218 db_trace_self(void)
219 {
220 db_trace_thread(curthread, -1);
221 }
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