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
5This file is part of libunwind.
6
7Permission is hereby granted, free of charge, to any person obtaining
8a copy of this software and associated documentation files (the
9"Software"), to deal in the Software without restriction, including
10without limitation the rights to use, copy, modify, merge, publish,
11distribute, sublicense, and/or sell copies of the Software, and to
12permit persons to whom the Software is furnished to do so, subject to
13the following conditions:
14
15The above copyright notice and this permission notice shall be
16included in all copies or substantial portions of the Software.
17
18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
25
26#include "offsets.h"
27#include "unwind_i.h"
28
29HIDDEN dwarf_loc_t
30x86_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
38HIDDEN int
39tdep_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
121HIDDEN int
122tdep_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