1 /* libunwind - a platform-independent unwind library
2 Copyright (c) 2002-2004 Hewlett-Packard Development Company, L.P.
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 "offsets.h"
27 #include "unwind_i.h"
28
29 HIDDEN dwarf_loc_t
x86_scratch_loc(struct cursor * c,unw_regnum_t reg)30 x86_scratch_loc (struct cursor *c, unw_regnum_t reg)
31 {
32 if (c->sigcontext_addr)
33 return x86_get_scratch_loc (c, reg);
34 else
35 return DWARF_REG_LOC (&c->dwarf, reg);
36 }
37
38 HIDDEN int
tdep_access_reg(struct cursor * c,unw_regnum_t reg,unw_word_t * valp,int write)39 tdep_access_reg (struct cursor *c, unw_regnum_t reg, unw_word_t *valp,
40 int write)
41 {
42 dwarf_loc_t loc = DWARF_NULL_LOC;
43 unsigned int mask;
44 int arg_num;
45
46 switch (reg)
47 {
48
49 case UNW_X86_EIP:
50 if (write)
51 c->dwarf.ip = *valp; /* also update the EIP cache */
52 loc = c->dwarf.loc[EIP];
53 break;
54
55 case UNW_X86_CFA:
56 case UNW_X86_ESP:
57 if (write)
58 return -UNW_EREADONLYREG;
59 *valp = c->dwarf.cfa;
60 return 0;
61
62 case UNW_X86_EAX:
63 case UNW_X86_EDX:
64 arg_num = reg - UNW_X86_EAX;
65 mask = (1 << arg_num);
66 if (write)
67 {
68 c->dwarf.eh_args[arg_num] = *valp;
69 c->dwarf.eh_valid_mask |= mask;
70 return 0;
71 }
72 else if ((c->dwarf.eh_valid_mask & mask) != 0)
73 {
74 *valp = c->dwarf.eh_args[arg_num];
75 return 0;
76 }
77 else
78 loc = c->dwarf.loc[(reg == UNW_X86_EAX) ? EAX : EDX];
79 break;
80
81 case UNW_X86_ECX: loc = c->dwarf.loc[ECX]; break;
82 case UNW_X86_EBX: loc = c->dwarf.loc[EBX]; break;
83
84 case UNW_X86_EBP: loc = c->dwarf.loc[EBP]; break;
85 case UNW_X86_ESI: loc = c->dwarf.loc[ESI]; break;
86 case UNW_X86_EDI: loc = c->dwarf.loc[EDI]; break;
87 case UNW_X86_EFLAGS: loc = c->dwarf.loc[EFLAGS]; break;
88 case UNW_X86_TRAPNO: loc = c->dwarf.loc[TRAPNO]; break;
89
90 case UNW_X86_FCW:
91 case UNW_X86_FSW:
92 case UNW_X86_FTW:
93 case UNW_X86_FOP:
94 case UNW_X86_FCS:
95 case UNW_X86_FIP:
96 case UNW_X86_FEA:
97 case UNW_X86_FDS:
98 case UNW_X86_MXCSR:
99 case UNW_X86_GS:
100 case UNW_X86_FS:
101 case UNW_X86_ES:
102 case UNW_X86_DS:
103 case UNW_X86_SS:
104 case UNW_X86_CS:
105 case UNW_X86_TSS:
106 case UNW_X86_LDT:
107 loc = x86_scratch_loc (c, reg);
108 break;
109
110 default:
111 Debug (1, "bad register number %u\n", reg);
112 return -UNW_EBADREG;
113 }
114
115 if (write)
116 return dwarf_put (&c->dwarf, loc, *valp);
117 else
118 return dwarf_get (&c->dwarf, loc, valp);
119 }
120
121 HIDDEN int
tdep_access_fpreg(struct cursor * c,unw_regnum_t reg,unw_fpreg_t * valp,int write)122 tdep_access_fpreg (struct cursor *c, unw_regnum_t reg, unw_fpreg_t *valp,
123 int write)
124 {
125 struct dwarf_loc loc = DWARF_NULL_LOC;
126
127 switch (reg)
128 {
129 case UNW_X86_ST0:
130 loc = c->dwarf.loc[ST0];
131 break;
132
133 /* stacked fp registers */
134 case UNW_X86_ST1:
135 case UNW_X86_ST2:
136 case UNW_X86_ST3:
137 case UNW_X86_ST4:
138 case UNW_X86_ST5:
139 case UNW_X86_ST6:
140 case UNW_X86_ST7:
141 /* SSE fp registers */
142 case UNW_X86_XMM0:
143 case UNW_X86_XMM1:
144 case UNW_X86_XMM2:
145 case UNW_X86_XMM3:
146 case UNW_X86_XMM4:
147 case UNW_X86_XMM5:
148 case UNW_X86_XMM6:
149 case UNW_X86_XMM7:
150 case UNW_X86_XMM0_lo:
151 case UNW_X86_XMM0_hi:
152 case UNW_X86_XMM1_lo:
153 case UNW_X86_XMM1_hi:
154 case UNW_X86_XMM2_lo:
155 case UNW_X86_XMM2_hi:
156 case UNW_X86_XMM3_lo:
157 case UNW_X86_XMM3_hi:
158 case UNW_X86_XMM4_lo:
159 case UNW_X86_XMM4_hi:
160 case UNW_X86_XMM5_lo:
161 case UNW_X86_XMM5_hi:
162 case UNW_X86_XMM6_lo:
163 case UNW_X86_XMM6_hi:
164 case UNW_X86_XMM7_lo:
165 case UNW_X86_XMM7_hi:
166 loc = x86_scratch_loc (c, reg);
167 break;
168
169 default:
170 Debug (1, "bad register number %u\n", reg);
171 return -UNW_EBADREG;
172 }
173
174 if (write)
175 return dwarf_putfp (&c->dwarf, loc, *valp);
176 else
177 return dwarf_getfp (&c->dwarf, loc, valp);
178 }
179