1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2002-2005 Hewlett-Packard Co
3 Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4
5 This file is part of libunwind.
6
7 Permission is hereby granted, free of charge, to any person obtaining
8 a copy of this software and associated documentation files (the
9 "Software"), to deal in the Software without restriction, including
10 without limitation the rights to use, copy, modify, merge, publish,
11 distribute, sublicense, and/or sell copies of the Software, and to
12 permit persons to whom the Software is furnished to do so, subject to
13 the following conditions:
14
15 The above copyright notice and this permission notice shall be
16 included in all copies or substantial portions of the Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
25
26 /* Logically, we like to think of the stack as a contiguous region of
27 memory. Unfortunately, this logical view doesn't work for the
28 register backing store, because the RSE is an asynchronous engine and
29 because UNIX/Linux allow for stack-switching via sigaltstack(2).
30 Specifically, this means that any given stacked register may or may
31 not be backed up by memory in the current stack. If not, then the
32 backing memory may be found in any of the "more inner" (younger)
33 stacks. The routines in this file help manage the discontiguous
34 nature of the register backing store. The routines are completely
35 independent of UNIX/Linux, but each stack frame that switches the
36 backing store is expected to reserve 4 words for use by libunwind. For
37 example, in the Linux sigcontext, sc_fr[0] and sc_fr[1] serve this
38 purpose. */
39
40 #include "libunwind_i.h"
41
42 /* Maintain the register names as a single string to keep the number
43 of dynamic relocations in the shared object to a minimum. */
44
45 #define regname_len 9
46 #define regname_str \
47 "r0\0\0\0\0\0\0\0r1\0\0\0\0\0\0\0r2\0\0\0\0\0\0\0r3\0\0\0\0\0\0\0" \
48 "r4\0\0\0\0\0\0\0r5\0\0\0\0\0\0\0r6\0\0\0\0\0\0\0r7\0\0\0\0\0\0\0" \
49 "r8\0\0\0\0\0\0\0r9\0\0\0\0\0\0\0r10\0\0\0\0\0\0r11\0\0\0\0\0\0" \
50 "r12\0\0\0\0\0\0r13\0\0\0\0\0\0r14\0\0\0\0\0\0r15\0\0\0\0\0\0" \
51 "r16\0\0\0\0\0\0r17\0\0\0\0\0\0r18\0\0\0\0\0\0r19\0\0\0\0\0\0" \
52 "r20\0\0\0\0\0\0r21\0\0\0\0\0\0r22\0\0\0\0\0\0r23\0\0\0\0\0\0" \
53 "r24\0\0\0\0\0\0r25\0\0\0\0\0\0r26\0\0\0\0\0\0r27\0\0\0\0\0\0" \
54 "r28\0\0\0\0\0\0r29\0\0\0\0\0\0r30\0\0\0\0\0\0r31\0\0\0\0\0\0" \
55 "r32\0\0\0\0\0\0r33\0\0\0\0\0\0r34\0\0\0\0\0\0r35\0\0\0\0\0\0" \
56 "r36\0\0\0\0\0\0r37\0\0\0\0\0\0r38\0\0\0\0\0\0r39\0\0\0\0\0\0" \
57 "r40\0\0\0\0\0\0r41\0\0\0\0\0\0r42\0\0\0\0\0\0r43\0\0\0\0\0\0" \
58 "r44\0\0\0\0\0\0r45\0\0\0\0\0\0r46\0\0\0\0\0\0r47\0\0\0\0\0\0" \
59 "r48\0\0\0\0\0\0r49\0\0\0\0\0\0r50\0\0\0\0\0\0r51\0\0\0\0\0\0" \
60 "r52\0\0\0\0\0\0r53\0\0\0\0\0\0r54\0\0\0\0\0\0r55\0\0\0\0\0\0" \
61 "r56\0\0\0\0\0\0r57\0\0\0\0\0\0r58\0\0\0\0\0\0r59\0\0\0\0\0\0" \
62 "r60\0\0\0\0\0\0r61\0\0\0\0\0\0r62\0\0\0\0\0\0r63\0\0\0\0\0\0" \
63 "r64\0\0\0\0\0\0r65\0\0\0\0\0\0r66\0\0\0\0\0\0r67\0\0\0\0\0\0" \
64 "r68\0\0\0\0\0\0r69\0\0\0\0\0\0r70\0\0\0\0\0\0r71\0\0\0\0\0\0" \
65 "r72\0\0\0\0\0\0r73\0\0\0\0\0\0r74\0\0\0\0\0\0r75\0\0\0\0\0\0" \
66 "r76\0\0\0\0\0\0r77\0\0\0\0\0\0r78\0\0\0\0\0\0r79\0\0\0\0\0\0" \
67 "r80\0\0\0\0\0\0r81\0\0\0\0\0\0r82\0\0\0\0\0\0r83\0\0\0\0\0\0" \
68 "r84\0\0\0\0\0\0r85\0\0\0\0\0\0r86\0\0\0\0\0\0r87\0\0\0\0\0\0" \
69 "r88\0\0\0\0\0\0r89\0\0\0\0\0\0r90\0\0\0\0\0\0r91\0\0\0\0\0\0" \
70 "r92\0\0\0\0\0\0r93\0\0\0\0\0\0r94\0\0\0\0\0\0r95\0\0\0\0\0\0" \
71 "r96\0\0\0\0\0\0r97\0\0\0\0\0\0r98\0\0\0\0\0\0r99\0\0\0\0\0\0" \
72 "r100\0\0\0\0\0r101\0\0\0\0\0r102\0\0\0\0\0r103\0\0\0\0\0" \
73 "r104\0\0\0\0\0r105\0\0\0\0\0r106\0\0\0\0\0r107\0\0\0\0\0" \
74 "r108\0\0\0\0\0r109\0\0\0\0\0r110\0\0\0\0\0r111\0\0\0\0\0" \
75 "r112\0\0\0\0\0r113\0\0\0\0\0r114\0\0\0\0\0r115\0\0\0\0\0" \
76 "r116\0\0\0\0\0r117\0\0\0\0\0r118\0\0\0\0\0r119\0\0\0\0\0" \
77 "r120\0\0\0\0\0r121\0\0\0\0\0r122\0\0\0\0\0r123\0\0\0\0\0" \
78 "r124\0\0\0\0\0r125\0\0\0\0\0r126\0\0\0\0\0r127\0\0\0\0\0" \
79 "nat0\0\0\0\0\0nat1\0\0\0\0\0nat2\0\0\0\0\0nat3\0\0\0\0\0" \
80 "nat4\0\0\0\0\0nat5\0\0\0\0\0nat6\0\0\0\0\0nat7\0\0\0\0\0" \
81 "nat8\0\0\0\0\0nat9\0\0\0\0\0nat10\0\0\0\0nat11\0\0\0\0" \
82 "nat12\0\0\0\0nat13\0\0\0\0nat14\0\0\0\0nat15\0\0\0\0" \
83 "nat16\0\0\0\0nat17\0\0\0\0nat18\0\0\0\0nat19\0\0\0\0" \
84 "nat20\0\0\0\0nat21\0\0\0\0nat22\0\0\0\0nat23\0\0\0\0" \
85 "nat24\0\0\0\0nat25\0\0\0\0nat26\0\0\0\0nat27\0\0\0\0" \
86 "nat28\0\0\0\0nat29\0\0\0\0nat30\0\0\0\0nat31\0\0\0\0" \
87 "nat32\0\0\0\0nat33\0\0\0\0nat34\0\0\0\0nat35\0\0\0\0" \
88 "nat36\0\0\0\0nat37\0\0\0\0nat38\0\0\0\0nat39\0\0\0\0" \
89 "nat40\0\0\0\0nat41\0\0\0\0nat42\0\0\0\0nat43\0\0\0\0" \
90 "nat44\0\0\0\0nat45\0\0\0\0nat46\0\0\0\0nat47\0\0\0\0" \
91 "nat48\0\0\0\0nat49\0\0\0\0nat50\0\0\0\0nat51\0\0\0\0" \
92 "nat52\0\0\0\0nat53\0\0\0\0nat54\0\0\0\0nat55\0\0\0\0" \
93 "nat56\0\0\0\0nat57\0\0\0\0nat58\0\0\0\0nat59\0\0\0\0" \
94 "nat60\0\0\0\0nat61\0\0\0\0nat62\0\0\0\0nat63\0\0\0\0" \
95 "nat64\0\0\0\0nat65\0\0\0\0nat66\0\0\0\0nat67\0\0\0\0" \
96 "nat68\0\0\0\0nat69\0\0\0\0nat70\0\0\0\0nat71\0\0\0\0" \
97 "nat72\0\0\0\0nat73\0\0\0\0nat74\0\0\0\0nat75\0\0\0\0" \
98 "nat76\0\0\0\0nat77\0\0\0\0nat78\0\0\0\0nat79\0\0\0\0" \
99 "nat80\0\0\0\0nat81\0\0\0\0nat82\0\0\0\0nat83\0\0\0\0" \
100 "nat84\0\0\0\0nat85\0\0\0\0nat86\0\0\0\0nat87\0\0\0\0" \
101 "nat88\0\0\0\0nat89\0\0\0\0nat90\0\0\0\0nat91\0\0\0\0" \
102 "nat92\0\0\0\0nat93\0\0\0\0nat94\0\0\0\0nat95\0\0\0\0" \
103 "nat96\0\0\0\0nat97\0\0\0\0nat98\0\0\0\0nat99\0\0\0\0" \
104 "nat100\0\0\0nat101\0\0\0nat102\0\0\0nat103\0\0\0" \
105 "nat104\0\0\0nat105\0\0\0nat106\0\0\0nat107\0\0\0" \
106 "nat108\0\0\0nat109\0\0\0nat110\0\0\0nat111\0\0\0" \
107 "nat112\0\0\0nat113\0\0\0nat114\0\0\0nat115\0\0\0" \
108 "nat116\0\0\0nat117\0\0\0nat118\0\0\0nat119\0\0\0" \
109 "nat120\0\0\0nat121\0\0\0nat122\0\0\0nat123\0\0\0" \
110 "nat124\0\0\0nat125\0\0\0nat126\0\0\0nat127\0\0\0" \
111 "f0\0\0\0\0\0\0\0f1\0\0\0\0\0\0\0f2\0\0\0\0\0\0\0f3\0\0\0\0\0\0\0" \
112 "f4\0\0\0\0\0\0\0f5\0\0\0\0\0\0\0f6\0\0\0\0\0\0\0f7\0\0\0\0\0\0\0" \
113 "f8\0\0\0\0\0\0\0f9\0\0\0\0\0\0\0f10\0\0\0\0\0\0f11\0\0\0\0\0\0" \
114 "f12\0\0\0\0\0\0f13\0\0\0\0\0\0f14\0\0\0\0\0\0f15\0\0\0\0\0\0" \
115 "f16\0\0\0\0\0\0f17\0\0\0\0\0\0f18\0\0\0\0\0\0f19\0\0\0\0\0\0" \
116 "f20\0\0\0\0\0\0f21\0\0\0\0\0\0f22\0\0\0\0\0\0f23\0\0\0\0\0\0" \
117 "f24\0\0\0\0\0\0f25\0\0\0\0\0\0f26\0\0\0\0\0\0f27\0\0\0\0\0\0" \
118 "f28\0\0\0\0\0\0f29\0\0\0\0\0\0f30\0\0\0\0\0\0f31\0\0\0\0\0\0" \
119 "f32\0\0\0\0\0\0f33\0\0\0\0\0\0f34\0\0\0\0\0\0f35\0\0\0\0\0\0" \
120 "f36\0\0\0\0\0\0f37\0\0\0\0\0\0f38\0\0\0\0\0\0f39\0\0\0\0\0\0" \
121 "f40\0\0\0\0\0\0f41\0\0\0\0\0\0f42\0\0\0\0\0\0f43\0\0\0\0\0\0" \
122 "f44\0\0\0\0\0\0f45\0\0\0\0\0\0f46\0\0\0\0\0\0f47\0\0\0\0\0\0" \
123 "f48\0\0\0\0\0\0f49\0\0\0\0\0\0f50\0\0\0\0\0\0f51\0\0\0\0\0\0" \
124 "f52\0\0\0\0\0\0f53\0\0\0\0\0\0f54\0\0\0\0\0\0f55\0\0\0\0\0\0" \
125 "f56\0\0\0\0\0\0f57\0\0\0\0\0\0f58\0\0\0\0\0\0f59\0\0\0\0\0\0" \
126 "f60\0\0\0\0\0\0f61\0\0\0\0\0\0f62\0\0\0\0\0\0f63\0\0\0\0\0\0" \
127 "f64\0\0\0\0\0\0f65\0\0\0\0\0\0f66\0\0\0\0\0\0f67\0\0\0\0\0\0" \
128 "f68\0\0\0\0\0\0f69\0\0\0\0\0\0f70\0\0\0\0\0\0f71\0\0\0\0\0\0" \
129 "f72\0\0\0\0\0\0f73\0\0\0\0\0\0f74\0\0\0\0\0\0f75\0\0\0\0\0\0" \
130 "f76\0\0\0\0\0\0f77\0\0\0\0\0\0f78\0\0\0\0\0\0f79\0\0\0\0\0\0" \
131 "f80\0\0\0\0\0\0f81\0\0\0\0\0\0f82\0\0\0\0\0\0f83\0\0\0\0\0\0" \
132 "f84\0\0\0\0\0\0f85\0\0\0\0\0\0f86\0\0\0\0\0\0f87\0\0\0\0\0\0" \
133 "f88\0\0\0\0\0\0f89\0\0\0\0\0\0f90\0\0\0\0\0\0f91\0\0\0\0\0\0" \
134 "f92\0\0\0\0\0\0f93\0\0\0\0\0\0f94\0\0\0\0\0\0f95\0\0\0\0\0\0" \
135 "f96\0\0\0\0\0\0f97\0\0\0\0\0\0f98\0\0\0\0\0\0f99\0\0\0\0\0\0" \
136 "f100\0\0\0\0\0f101\0\0\0\0\0f102\0\0\0\0\0f103\0\0\0\0\0" \
137 "f104\0\0\0\0\0f105\0\0\0\0\0f106\0\0\0\0\0f107\0\0\0\0\0" \
138 "f108\0\0\0\0\0f109\0\0\0\0\0f110\0\0\0\0\0f111\0\0\0\0\0" \
139 "f112\0\0\0\0\0f113\0\0\0\0\0f114\0\0\0\0\0f115\0\0\0\0\0" \
140 "f116\0\0\0\0\0f117\0\0\0\0\0f118\0\0\0\0\0f119\0\0\0\0\0" \
141 "f120\0\0\0\0\0f121\0\0\0\0\0f122\0\0\0\0\0f123\0\0\0\0\0" \
142 "f124\0\0\0\0\0f125\0\0\0\0\0f126\0\0\0\0\0f127\0\0\0\0\0" \
143 "ar0\0\0\0\0\0\0ar1\0\0\0\0\0\0ar2\0\0\0\0\0\0ar3\0\0\0\0\0\0" \
144 "ar4\0\0\0\0\0\0ar5\0\0\0\0\0\0ar6\0\0\0\0\0\0ar7\0\0\0\0\0\0" \
145 "ar8\0\0\0\0\0\0ar9\0\0\0\0\0\0ar10\0\0\0\0\0ar11\0\0\0\0\0" \
146 "ar12\0\0\0\0\0ar13\0\0\0\0\0ar14\0\0\0\0\0ar15\0\0\0\0\0" \
147 "rsc\0\0\0\0\0\0bsp\0\0\0\0\0\0bspstore\0rnat\0\0\0\0\0" \
148 "ar20\0\0\0\0\0ar21\0\0\0\0\0ar22\0\0\0\0\0ar23\0\0\0\0\0" \
149 "ar24\0\0\0\0\0ar25\0\0\0\0\0ar26\0\0\0\0\0ar27\0\0\0\0\0" \
150 "ar28\0\0\0\0\0ar29\0\0\0\0\0ar30\0\0\0\0\0ar31\0\0\0\0\0" \
151 "ccv\0\0\0\0\0\0ar33\0\0\0\0\0ar34\0\0\0\0\0ar35\0\0\0\0\0" \
152 "unat\0\0\0\0\0ar37\0\0\0\0\0ar38\0\0\0\0\0ar39\0\0\0\0\0" \
153 "fpsr\0\0\0\0\0ar41\0\0\0\0\0ar42\0\0\0\0\0ar43\0\0\0\0\0" \
154 "ar44\0\0\0\0\0ar45\0\0\0\0\0ar46\0\0\0\0\0ar47\0\0\0\0\0" \
155 "ar48\0\0\0\0\0ar49\0\0\0\0\0ar50\0\0\0\0\0ar51\0\0\0\0\0" \
156 "ar52\0\0\0\0\0ar53\0\0\0\0\0ar54\0\0\0\0\0ar55\0\0\0\0\0" \
157 "ar56\0\0\0\0\0ar57\0\0\0\0\0ar58\0\0\0\0\0ar59\0\0\0\0\0" \
158 "ar60\0\0\0\0\0ar61\0\0\0\0\0ar62\0\0\0\0\0ar63\0\0\0\0\0" \
159 "pfs\0\0\0\0\0\0lc\0\0\0\0\0\0\0ec\0\0\0\0\0\0\0ar67\0\0\0\0\0" \
160 "ar68\0\0\0\0\0ar69\0\0\0\0\0ar70\0\0\0\0\0ar71\0\0\0\0\0" \
161 "ar72\0\0\0\0\0ar73\0\0\0\0\0ar74\0\0\0\0\0ar75\0\0\0\0\0" \
162 "ar76\0\0\0\0\0ar77\0\0\0\0\0ar78\0\0\0\0\0ar79\0\0\0\0\0" \
163 "ar80\0\0\0\0\0ar81\0\0\0\0\0ar82\0\0\0\0\0ar83\0\0\0\0\0" \
164 "ar84\0\0\0\0\0ar85\0\0\0\0\0ar86\0\0\0\0\0ar87\0\0\0\0\0" \
165 "ar88\0\0\0\0\0ar89\0\0\0\0\0ar90\0\0\0\0\0ar91\0\0\0\0\0" \
166 "ar92\0\0\0\0\0ar93\0\0\0\0\0ar94\0\0\0\0\0ar95\0\0\0\0\0" \
167 "ar96\0\0\0\0\0ar97\0\0\0\0\0ar98\0\0\0\0\0ar99\0\0\0\0\0" \
168 "ar100\0\0\0\0ar101\0\0\0\0ar102\0\0\0\0ar103\0\0\0\0" \
169 "ar104\0\0\0\0ar105\0\0\0\0ar106\0\0\0\0ar107\0\0\0\0" \
170 "ar108\0\0\0\0ar109\0\0\0\0ar110\0\0\0\0ar111\0\0\0\0" \
171 "ar112\0\0\0\0ar113\0\0\0\0ar114\0\0\0\0ar115\0\0\0\0" \
172 "ar116\0\0\0\0ar117\0\0\0\0ar118\0\0\0\0ar119\0\0\0\0" \
173 "ar120\0\0\0\0ar121\0\0\0\0ar122\0\0\0\0ar123\0\0\0\0" \
174 "ar124\0\0\0\0ar125\0\0\0\0ar126\0\0\0\0ar127\0\0\0\0" \
175 "rp\0\0\0\0\0\0\0b1\0\0\0\0\0\0\0b2\0\0\0\0\0\0\0b3\0\0\0\0\0\0\0" \
176 "b4\0\0\0\0\0\0\0b5\0\0\0\0\0\0\0b6\0\0\0\0\0\0\0b7\0\0\0\0\0\0\0" \
177 "pr\0\0\0\0\0\0\0cfm\0\0\0\0\0\0bsp\0\0\0\0\0\0ip\0\0\0\0\0\0\0" \
178 "sp\0\0\0\0\0\0\0"
179
180 #define NREGS ((int) (sizeof (regname_str) - 1) / regname_len)
181
182 const char *
unw_regname(unw_regnum_t reg)183 unw_regname (unw_regnum_t reg)
184 {
185 if (reg < NREGS)
186 return regname_str + reg * regname_len;
187 else
188 return "???";
189 }
190