Gregs.c revision 6607424863ecedc32f3a3030a623fb19b61b16e3 
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
29static inline dwarf_loc_t
30linux_scratch_loc (struct cursor *c, unw_regnum_t reg)
31{
32  unw_word_t addr = c->sigcontext_addr, fpstate_addr, off;
33  int ret, is_fpstate = 0;
34
35  switch (c->sigcontext_format)
36    {
37    case X86_SCF_NONE:
38      return DWARF_REG_LOC (&c->dwarf, reg);
39
40    case X86_SCF_LINUX_SIGFRAME:
41      break;
42
43    case X86_SCF_LINUX_RT_SIGFRAME:
44      addr += LINUX_UC_MCONTEXT_OFF;
45      break;
46    }
47
48  switch (reg)
49    {
50    case UNW_X86_GS: off = LINUX_SC_GS_OFF; break;
51    case UNW_X86_FS: off = LINUX_SC_FS_OFF; break;
52    case UNW_X86_ES: off = LINUX_SC_ES_OFF; break;
53    case UNW_X86_DS: off = LINUX_SC_DS_OFF; break;
54    case UNW_X86_EDI: off = LINUX_SC_EDI_OFF; break;
55    case UNW_X86_ESI: off = LINUX_SC_ESI_OFF; break;
56    case UNW_X86_EBP: off = LINUX_SC_EBP_OFF; break;
57    case UNW_X86_ESP: off = LINUX_SC_ESP_OFF; break;
58    case UNW_X86_EBX: off = LINUX_SC_EBX_OFF; break;
59    case UNW_X86_EDX: off = LINUX_SC_EDX_OFF; break;
60    case UNW_X86_ECX: off = LINUX_SC_ECX_OFF; break;
61    case UNW_X86_EAX: off = LINUX_SC_EAX_OFF; break;
62    case UNW_X86_TRAPNO: off = LINUX_SC_TRAPNO_OFF; break;
63    case UNW_X86_EIP: off = LINUX_SC_EIP_OFF; break;
64    case UNW_X86_CS: off = LINUX_SC_CS_OFF; break;
65    case UNW_X86_EFLAGS: off = LINUX_SC_EFLAGS_OFF; break;
66    case UNW_X86_SS: off = LINUX_SC_SS_OFF; break;
67
68      /* The following is probably not correct for all possible cases.
69	 Somebody who understands this better should review this for
70	 correctness.  */
71
72    case UNW_X86_FCW: is_fpstate = 1; off = LINUX_FPSTATE_CW_OFF; break;
73    case UNW_X86_FSW: is_fpstate = 1; off = LINUX_FPSTATE_SW_OFF; break;
74    case UNW_X86_FTW: is_fpstate = 1; off = LINUX_FPSTATE_TAG_OFF; break;
75    case UNW_X86_FCS: is_fpstate = 1; off = LINUX_FPSTATE_CSSEL_OFF; break;
76    case UNW_X86_FIP: is_fpstate = 1; off = LINUX_FPSTATE_IPOFF_OFF; break;
77    case UNW_X86_FEA: is_fpstate = 1; off = LINUX_FPSTATE_DATAOFF_OFF; break;
78    case UNW_X86_FDS: is_fpstate = 1; off = LINUX_FPSTATE_DATASEL_OFF; break;
79    case UNW_X86_MXCSR: is_fpstate = 1; off = LINUX_FPSTATE_MXCSR_OFF; break;
80
81      /* stacked fp registers */
82    case UNW_X86_ST0: case UNW_X86_ST1: case UNW_X86_ST2: case UNW_X86_ST3:
83    case UNW_X86_ST4: case UNW_X86_ST5: case UNW_X86_ST6: case UNW_X86_ST7:
84      is_fpstate = 1;
85      off = LINUX_FPSTATE_ST0_OFF + 10*(reg - UNW_X86_ST0);
86      break;
87
88     /* SSE fp registers */
89    case UNW_X86_XMM0_lo: case UNW_X86_XMM0_hi:
90    case UNW_X86_XMM1_lo: case UNW_X86_XMM1_hi:
91    case UNW_X86_XMM2_lo: case UNW_X86_XMM2_hi:
92    case UNW_X86_XMM3_lo: case UNW_X86_XMM3_hi:
93    case UNW_X86_XMM4_lo: case UNW_X86_XMM4_hi:
94    case UNW_X86_XMM5_lo: case UNW_X86_XMM5_hi:
95    case UNW_X86_XMM6_lo: case UNW_X86_XMM6_hi:
96    case UNW_X86_XMM7_lo: case UNW_X86_XMM7_hi:
97      is_fpstate = 1;
98      off = LINUX_FPSTATE_XMM0_OFF + 8*(reg - UNW_X86_XMM0_lo);
99      break;
100
101    case UNW_X86_FOP:
102    case UNW_X86_TSS:
103    case UNW_X86_LDT:
104    default:
105      return DWARF_REG_LOC (&c->dwarf, reg);
106    }
107
108  if (is_fpstate)
109    {
110      if ((ret = dwarf_get (&c->dwarf,
111			    DWARF_MEM_LOC (&c->dwarf,
112					   addr + LINUX_SC_FPSTATE_OFF),
113			    &fpstate_addr)) < 0)
114	return DWARF_NULL_LOC;
115
116      if (!fpstate_addr)
117	return DWARF_NULL_LOC;
118
119      return DWARF_MEM_LOC (c, fpstate_addr + off);
120    }
121  else
122    return DWARF_MEM_LOC (c, addr + off);
123}
124
125HIDDEN dwarf_loc_t
126x86_scratch_loc (struct cursor *c, unw_regnum_t reg)
127{
128  if (c->sigcontext_addr)
129    return linux_scratch_loc (c, reg);
130  else
131    return DWARF_REG_LOC (&c->dwarf, reg);
132}
133
134HIDDEN int
135tdep_access_reg (struct cursor *c, unw_regnum_t reg, unw_word_t *valp,
136		 int write)
137{
138  dwarf_loc_t loc = DWARF_NULL_LOC;
139
140  switch (reg)
141    {
142
143    case UNW_X86_EIP:
144      if (write)
145	c->dwarf.ip = *valp;		/* also update the EIP cache */
146      loc = c->dwarf.loc[EIP];
147      break;
148
149    case UNW_X86_CFA:
150      if (write)
151	return -UNW_EREADONLYREG;
152      *valp = c->dwarf.cfa;
153      return 0;
154
155    case UNW_X86_EAX: loc = c->dwarf.loc[EAX]; break;
156    case UNW_X86_ECX: loc = c->dwarf.loc[ECX]; break;
157    case UNW_X86_EDX: loc = c->dwarf.loc[EDX]; break;
158    case UNW_X86_EBX: loc = c->dwarf.loc[EBX]; break;
159    case UNW_X86_ESP: loc = c->dwarf.loc[ESP]; break;
160    case UNW_X86_EBP: loc = c->dwarf.loc[EBP]; break;
161    case UNW_X86_ESI: loc = c->dwarf.loc[ESI]; break;
162    case UNW_X86_EDI: loc = c->dwarf.loc[EDI]; break;
163    case UNW_X86_EFLAGS: loc = c->dwarf.loc[EFLAGS]; break;
164    case UNW_X86_TRAPNO: loc = c->dwarf.loc[TRAPNO]; break;
165
166    case UNW_X86_FCW:
167    case UNW_X86_FSW:
168    case UNW_X86_FTW:
169    case UNW_X86_FOP:
170    case UNW_X86_FCS:
171    case UNW_X86_FIP:
172    case UNW_X86_FEA:
173    case UNW_X86_FDS:
174    case UNW_X86_MXCSR:
175    case UNW_X86_GS:
176    case UNW_X86_FS:
177    case UNW_X86_ES:
178    case UNW_X86_DS:
179    case UNW_X86_SS:
180    case UNW_X86_CS:
181    case UNW_X86_TSS:
182    case UNW_X86_LDT:
183      loc = x86_scratch_loc (c, reg);
184      break;
185
186    default:
187      Debug (1, "bad register number %u\n", reg);
188      return -UNW_EBADREG;
189    }
190
191  if (write)
192    return dwarf_put (&c->dwarf, loc, *valp);
193  else
194    return dwarf_get (&c->dwarf, loc, valp);
195}
196
197HIDDEN int
198tdep_access_fpreg (struct cursor *c, unw_regnum_t reg, unw_fpreg_t *valp,
199		   int write)
200{
201  struct dwarf_loc loc = DWARF_NULL_LOC;
202
203  switch (reg)
204    {
205    case UNW_X86_ST0:
206      loc = c->dwarf.loc[ST0];
207      break;
208
209      /* stacked fp registers */
210    case UNW_X86_ST1:
211    case UNW_X86_ST2:
212    case UNW_X86_ST3:
213    case UNW_X86_ST4:
214    case UNW_X86_ST5:
215    case UNW_X86_ST6:
216    case UNW_X86_ST7:
217      /* SSE fp registers */
218    case UNW_X86_XMM0_lo:
219    case UNW_X86_XMM0_hi:
220    case UNW_X86_XMM1_lo:
221    case UNW_X86_XMM1_hi:
222    case UNW_X86_XMM2_lo:
223    case UNW_X86_XMM2_hi:
224    case UNW_X86_XMM3_lo:
225    case UNW_X86_XMM3_hi:
226    case UNW_X86_XMM4_lo:
227    case UNW_X86_XMM4_hi:
228    case UNW_X86_XMM5_lo:
229    case UNW_X86_XMM5_hi:
230    case UNW_X86_XMM6_lo:
231    case UNW_X86_XMM6_hi:
232    case UNW_X86_XMM7_lo:
233    case UNW_X86_XMM7_hi:
234      loc = x86_scratch_loc (c, reg);
235      break;
236
237    default:
238      Debug (1, "bad register number %u\n", reg);
239      return -UNW_EBADREG;
240    }
241
242  if (write)
243    return dwarf_putfp (&c->dwarf, loc, *valp);
244  else
245    return dwarf_getfp (&c->dwarf, loc, valp);
246}
247