Gget_save_loc.c revision 8e6f3c84851c8efb66d3e153a22b8aff33f91da5 
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
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 <assert.h>
27
28#include "rse.h"
29
30#include "offsets.h"
31#include "regs.h"
32
33PROTECTED int
34unw_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