1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2002-2003, 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 #include <assert.h>
27
28 #include "rse.h"
29
30 #include "offsets.h"
31 #include "regs.h"
32
33 int
unw_get_save_loc(unw_cursor_t * cursor,int reg,unw_save_loc_t * sloc)34 unw_get_save_loc (unw_cursor_t *cursor, int reg, unw_save_loc_t *sloc)
35 {
36 struct cursor *c = (struct cursor *) cursor;
37 ia64_loc_t loc, reg_loc;
38 uint8_t nat_bitnr;
39 int ret;
40
41 loc = IA64_NULL_LOC; /* default to "not saved" */
42
43 switch (reg)
44 {
45 /* frame registers */
46 case UNW_IA64_BSP:
47 case UNW_REG_SP:
48 default:
49 break;
50
51 case UNW_REG_IP:
52 loc = c->loc[IA64_REG_IP];
53 break;
54
55 /* preserved registers: */
56 case UNW_IA64_GR + 4 ... UNW_IA64_GR + 7:
57 loc = c->loc[IA64_REG_R4 + (reg - (UNW_IA64_GR + 4))];
58 break;
59
60 case UNW_IA64_NAT + 4 ... UNW_IA64_NAT + 7:
61 loc = c->loc[IA64_REG_NAT4 + (reg - (UNW_IA64_NAT + 4))];
62 reg_loc = c->loc[IA64_REG_R4 + (reg - (UNW_IA64_NAT + 4))];
63 nat_bitnr = c->nat_bitnr[reg - (UNW_IA64_NAT + 4)];
64 if (IA64_IS_FP_LOC (reg_loc))
65 /* NaT bit saved as a NaTVal. */
66 loc = reg_loc;
67 break;
68
69 case UNW_IA64_FR + 2: loc = c->loc[IA64_REG_F2]; break;
70 case UNW_IA64_FR + 3: loc = c->loc[IA64_REG_F3]; break;
71 case UNW_IA64_FR + 4: loc = c->loc[IA64_REG_F4]; break;
72 case UNW_IA64_FR + 5: loc = c->loc[IA64_REG_F5]; break;
73 case UNW_IA64_FR + 16 ... UNW_IA64_FR + 31:
74 loc = c->loc[IA64_REG_F16 + (reg - (UNW_IA64_FR + 16))];
75 break;
76
77 case UNW_IA64_AR_BSP: loc = c->loc[IA64_REG_BSP]; break;
78 case UNW_IA64_AR_BSPSTORE: loc = c->loc[IA64_REG_BSPSTORE]; break;
79 case UNW_IA64_AR_PFS: loc = c->loc[IA64_REG_PFS]; break;
80 case UNW_IA64_AR_RNAT: loc = c->loc[IA64_REG_RNAT]; break;
81 case UNW_IA64_AR_UNAT: loc = c->loc[IA64_REG_UNAT]; break;
82 case UNW_IA64_AR_LC: loc = c->loc[IA64_REG_LC]; break;
83 case UNW_IA64_AR_FPSR: loc = c->loc[IA64_REG_FPSR]; break;
84 case UNW_IA64_BR + 1: loc = c->loc[IA64_REG_B1]; break;
85 case UNW_IA64_BR + 2: loc = c->loc[IA64_REG_B2]; break;
86 case UNW_IA64_BR + 3: loc = c->loc[IA64_REG_B3]; break;
87 case UNW_IA64_BR + 4: loc = c->loc[IA64_REG_B4]; break;
88 case UNW_IA64_BR + 5: loc = c->loc[IA64_REG_B5]; break;
89 case UNW_IA64_CFM: loc = c->cfm_loc; break;
90 case UNW_IA64_PR: loc = c->loc[IA64_REG_PR]; break;
91
92 case UNW_IA64_GR + 32 ... UNW_IA64_GR + 127: /* stacked reg */
93 reg = rotate_gr (c, reg - UNW_IA64_GR);
94 ret = ia64_get_stacked (c, reg, &loc, NULL);
95 if (ret < 0)
96 return ret;
97 break;
98
99 case UNW_IA64_NAT + 32 ... UNW_IA64_NAT + 127: /* stacked reg */
100 reg = rotate_gr (c, reg - UNW_IA64_NAT);
101 ret = ia64_get_stacked (c, reg, NULL, &loc);
102 break;
103
104 case UNW_IA64_AR_EC:
105 loc = c->cfm_loc;
106 break;
107
108 /* scratch & special registers: */
109
110 case UNW_IA64_GR + 0:
111 case UNW_IA64_GR + 1: /* global pointer */
112 case UNW_IA64_NAT + 0:
113 case UNW_IA64_NAT + 1: /* global pointer */
114 case UNW_IA64_FR + 0:
115 case UNW_IA64_FR + 1:
116 break;
117
118 case UNW_IA64_NAT + 2 ... UNW_IA64_NAT + 3:
119 case UNW_IA64_NAT + 8 ... UNW_IA64_NAT + 31:
120 loc = ia64_scratch_loc (c, reg, &nat_bitnr);
121 break;
122
123 case UNW_IA64_GR + 2 ... UNW_IA64_GR + 3:
124 case UNW_IA64_GR + 8 ... UNW_IA64_GR + 31:
125 case UNW_IA64_BR + 0:
126 case UNW_IA64_BR + 6:
127 case UNW_IA64_BR + 7:
128 case UNW_IA64_AR_RSC:
129 case UNW_IA64_AR_CSD:
130 case UNW_IA64_AR_SSD:
131 case UNW_IA64_AR_CCV:
132 loc = ia64_scratch_loc (c, reg, NULL);
133 break;
134
135 case UNW_IA64_FR + 6 ... UNW_IA64_FR + 15:
136 loc = ia64_scratch_loc (c, reg, NULL);
137 break;
138
139 case UNW_IA64_FR + 32 ... UNW_IA64_FR + 127:
140 reg = rotate_fr (c, reg - UNW_IA64_FR) + UNW_IA64_FR;
141 loc = ia64_scratch_loc (c, reg, NULL);
142 break;
143 }
144
145 memset (sloc, 0, sizeof (*sloc));
146
147 if (IA64_IS_NULL_LOC (loc))
148 {
149 sloc->type = UNW_SLT_NONE;
150 return 0;
151 }
152
153 #if !defined(UNW_LOCAL_ONLY)
154 if (IA64_IS_REG_LOC (loc))
155 {
156 sloc->type = UNW_SLT_REG;
157 sloc->u.regnum = IA64_GET_REG (loc);
158 sloc->extra.nat_bitnr = nat_bitnr;
159 }
160 else
161 #endif
162 {
163 sloc->type = UNW_SLT_MEMORY;
164 sloc->u.addr = IA64_GET_ADDR (loc);
165 sloc->extra.nat_bitnr = nat_bitnr;
166 }
167 return 0;
168 }
169