Gregs.c revision db1517609c217734dd5ef0bbc133cd2f23bb4465 
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  unsigned int mask;
140  int arg_num;
141
142  switch (reg)
143    {
144
145    case UNW_X86_EIP:
146      if (write)
147	c->dwarf.ip = *valp;		/* also update the EIP cache */
148      loc = c->dwarf.loc[EIP];
149      break;
150
151    case UNW_X86_CFA:
152    case UNW_X86_ESP:
153      if (write)
154	return -UNW_EREADONLYREG;
155      *valp = c->dwarf.cfa;
156      return 0;
157
158    case UNW_X86_EAX:
159    case UNW_X86_EDX:
160      arg_num = reg - UNW_X86_EAX;
161      mask = (1 << arg_num);
162      if (write)
163	{
164	  c->dwarf.eh_args[arg_num] = *valp;
165	  c->dwarf.eh_valid_mask |= mask;
166	  return 0;
167	}
168      else if ((c->dwarf.eh_valid_mask & mask) != 0)
169	{
170	  *valp = c->dwarf.eh_args[arg_num];
171	  return 0;
172	}
173      else
174	loc = c->dwarf.loc[(reg == UNW_X86_EAX) ? EAX : EDX];
175      break;
176
177    case UNW_X86_ECX: loc = c->dwarf.loc[ECX]; break;
178    case UNW_X86_EBX: loc = c->dwarf.loc[EBX]; break;
179
180    case UNW_X86_EBP: loc = c->dwarf.loc[EBP]; break;
181    case UNW_X86_ESI: loc = c->dwarf.loc[ESI]; break;
182    case UNW_X86_EDI: loc = c->dwarf.loc[EDI]; break;
183    case UNW_X86_EFLAGS: loc = c->dwarf.loc[EFLAGS]; break;
184    case UNW_X86_TRAPNO: loc = c->dwarf.loc[TRAPNO]; break;
185
186    case UNW_X86_FCW:
187    case UNW_X86_FSW:
188    case UNW_X86_FTW:
189    case UNW_X86_FOP:
190    case UNW_X86_FCS:
191    case UNW_X86_FIP:
192    case UNW_X86_FEA:
193    case UNW_X86_FDS:
194    case UNW_X86_MXCSR:
195    case UNW_X86_GS:
196    case UNW_X86_FS:
197    case UNW_X86_ES:
198    case UNW_X86_DS:
199    case UNW_X86_SS:
200    case UNW_X86_CS:
201    case UNW_X86_TSS:
202    case UNW_X86_LDT:
203      loc = x86_scratch_loc (c, reg);
204      break;
205
206    default:
207      Debug (1, "bad register number %u\n", reg);
208      return -UNW_EBADREG;
209    }
210
211  if (write)
212    return dwarf_put (&c->dwarf, loc, *valp);
213  else
214    return dwarf_get (&c->dwarf, loc, valp);
215}
216
217HIDDEN int
218tdep_access_fpreg (struct cursor *c, unw_regnum_t reg, unw_fpreg_t *valp,
219		   int write)
220{
221  struct dwarf_loc loc = DWARF_NULL_LOC;
222
223  switch (reg)
224    {
225    case UNW_X86_ST0:
226      loc = c->dwarf.loc[ST0];
227      break;
228
229      /* stacked fp registers */
230    case UNW_X86_ST1:
231    case UNW_X86_ST2:
232    case UNW_X86_ST3:
233    case UNW_X86_ST4:
234    case UNW_X86_ST5:
235    case UNW_X86_ST6:
236    case UNW_X86_ST7:
237      /* SSE fp registers */
238    case UNW_X86_XMM0_lo:
239    case UNW_X86_XMM0_hi:
240    case UNW_X86_XMM1_lo:
241    case UNW_X86_XMM1_hi:
242    case UNW_X86_XMM2_lo:
243    case UNW_X86_XMM2_hi:
244    case UNW_X86_XMM3_lo:
245    case UNW_X86_XMM3_hi:
246    case UNW_X86_XMM4_lo:
247    case UNW_X86_XMM4_hi:
248    case UNW_X86_XMM5_lo:
249    case UNW_X86_XMM5_hi:
250    case UNW_X86_XMM6_lo:
251    case UNW_X86_XMM6_hi:
252    case UNW_X86_XMM7_lo:
253    case UNW_X86_XMM7_hi:
254      loc = x86_scratch_loc (c, reg);
255      break;
256
257    default:
258      Debug (1, "bad register number %u\n", reg);
259      return -UNW_EBADREG;
260    }
261
262  if (write)
263    return dwarf_putfp (&c->dwarf, loc, *valp);
264  else
265    return dwarf_getfp (&c->dwarf, loc, valp);
266}
267