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/* ARM EABI compliant unwinding routines
   Copyright (C) 2004, 2005 Free Software Foundation, Inc.
   Contributed by Paul Brook
 
   This file is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 2, or (at your option) any
   later version.
 
   In addition to the permissions in the GNU General Public License, the
   Free Software Foundation gives you unlimited permission to link the
   compiled version of this file into combinations with other programs,
   and to distribute those combinations without any restriction coming
   from the use of this file.  (The General Public License restrictions
   do apply in other respects; for example, they cover modification of
   the file, and distribution when not linked into a combine
   executable.)
 
   This file is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program; see the file COPYING.  If not, write to
   the Free Software Foundation, 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.  */
#include "unwind.h"
 
/* We add a prototype for abort here to avoid creating a dependency on
   target headers.  */
extern void abort (void);
 
typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */
 
/* Misc constants.  */
#define R_IP    12
#define R_SP    13
#define R_LR    14
#define R_PC    15
 
#define uint32_highbit (((_uw) 1) << 31)
 
void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);
 
/* Unwind descriptors.  */
 
typedef struct
{
  _uw16 length;
  _uw16 offset;
} EHT16;
 
typedef struct
{
  _uw length;
  _uw offset;
} EHT32;
 
/* Calculate the address encoded by a 31-bit self-relative offset at address
   P.  Copy of routine in unwind-arm.c.  */
 
static inline _uw
selfrel_offset31 (const _uw *p)
{
  _uw offset;
 
  offset = *p;
  /* Sign extend to 32 bits.  */
  if (offset & (1 << 30))
    offset |= 1u << 31;
 
  return offset + (_uw) p;
}
 
 
/* Personality routine helper functions.  */
 
#define CODE_FINISH (0xb0)
 
/* Return the next byte of unwinding information, or CODE_FINISH if there is
   no data remaining.  */
static inline _uw8
next_unwind_byte (__gnu_unwind_state * uws)
{
  _uw8 b;
 
  if (uws->bytes_left == 0)
    {
      /* Load another word */
      if (uws->words_left == 0)
        return CODE_FINISH; /* Nothing left.  */
      uws->words_left--;
      uws->data = *(uws->next++);
      uws->bytes_left = 3;
    }
  else
    uws->bytes_left--;
 
  /* Extract the most significant byte.  */
  b = (uws->data >> 24) & 0xff;
  uws->data <<= 8;
  return b;
}
 
/* Execute the unwinding instructions described by UWS.  */
_Unwind_Reason_Code
__gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws)
{
  _uw op;
  int set_pc;
  _uw reg;
 
  set_pc = 0;
  for (;;)
    {
      op = next_unwind_byte (uws);
      if (op == CODE_FINISH)
        {
          /* If we haven't already set pc then copy it from lr.  */
          if (!set_pc)
            {
              _Unwind_VRS_Get (context, _UVRSC_CORE, R_LR, _UVRSD_UINT32,
                               &reg);
              _Unwind_VRS_Set (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32,
                               &reg);
              set_pc = 1;
            }
          /* Drop out of the loop.  */
          break;
        }
      if ((op & 0x80) == 0)
        {
          /* vsp = vsp +- (imm6 << 2 + 4).  */
          _uw offset;
 
          offset = ((op & 0x3f) << 2) + 4;
          _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
          if (op & 0x40)
            reg -= offset;
          else
            reg += offset;
          _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
          continue;
        }
 
      if ((op & 0xf0) == 0x80)
        {
          op = (op << 8) | next_unwind_byte (uws);
          if (op == 0x8000)
            {
              /* Refuse to unwind.  */
              return _URC_FAILURE;
            }
          /* Pop r4-r15 under mask.  */
          op = (op << 4) & 0xfff0;
          if (_Unwind_VRS_Pop (context, _UVRSC_CORE, op, _UVRSD_UINT32)
              != _UVRSR_OK)
            return _URC_FAILURE;
          if (op & (1 << R_PC))
            set_pc = 1;
          continue;
        }
      if ((op & 0xf0) == 0x90)
        {
          op &= 0xf;
          if (op == 13 || op == 15)
            /* Reserved.  */
            return _URC_FAILURE;
          /* vsp = r[nnnn].  */
          _Unwind_VRS_Get (context, _UVRSC_CORE, op, _UVRSD_UINT32, &reg);
          _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
          continue;
        }
      if ((op & 0xf0) == 0xa0)
        {
          /* Pop r4-r[4+nnn], [lr].  */
          _uw mask;
 
          mask = (0xff0 >> (7 - (op & 7))) & 0xff0;
          if (op & 8)
            mask |= (1 << R_LR);
          if (_Unwind_VRS_Pop (context, _UVRSC_CORE, mask, _UVRSD_UINT32)
              != _UVRSR_OK)
            return _URC_FAILURE;
          continue;
        }
      if ((op & 0xf0) == 0xb0)
        {
          /* op == 0xb0 already handled.  */
          if (op == 0xb1)
            {
              op = next_unwind_byte (uws);
              if (op == 0 || ((op & 0xf0) != 0))
                /* Spare.  */
                return _URC_FAILURE;
              /* Pop r0-r4 under mask.  */
              if (_Unwind_VRS_Pop (context, _UVRSC_CORE, op, _UVRSD_UINT32)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          if (op == 0xb2)
            {
              /* vsp = vsp + 0x204 + (uleb128 << 2).  */
              int shift;
 
              _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,
                               &reg);
              op = next_unwind_byte (uws);
              shift = 2;
              while (op & 0x80)
                {
                  reg += ((op & 0x7f) << shift);
                  shift += 7;
                  op = next_unwind_byte (uws);
                }
              reg += ((op & 0x7f) << shift) + 0x204;
              _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,
                               &reg);
              continue;
            }
          if (op == 0xb3)
            {
              /* Pop VFP registers with fldmx.  */
              op = next_unwind_byte (uws);
              op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_VFPX)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          if ((op & 0xfc) == 0xb4)
            {
              /* Pop FPA E[4]-E[4+nn].  */
              op = 0x40000 | ((op & 3) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_FPA, op, _UVRSD_FPAX)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          /* op & 0xf8 == 0xb8.  */
          /* Pop VFP D[8]-D[8+nnn] with fldmx.  */
          op = 0x80000 | ((op & 7) + 1);
          if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_VFPX)
              != _UVRSR_OK)
            return _URC_FAILURE;
          continue;
        }
      if ((op & 0xf0) == 0xc0)
        {
          if (op == 0xc6)
            {
              /* Pop iWMMXt D registers.  */
              op = next_unwind_byte (uws);
              op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_WMMXD, op, _UVRSD_UINT64)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          if (op == 0xc7)
            {
              op = next_unwind_byte (uws);
              if (op == 0 || (op & 0xf0) != 0)
                /* Spare.  */
                return _URC_FAILURE;
              /* Pop iWMMXt wCGR{3,2,1,0} under mask.  */
              if (_Unwind_VRS_Pop (context, _UVRSC_WMMXC, op, _UVRSD_UINT32)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          if ((op & 0xf8) == 0xc0)
            {
              /* Pop iWMMXt wR[10]-wR[10+nnn].  */
              op = 0xa0000 | ((op & 0xf) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_WMMXD, op, _UVRSD_UINT64)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          if (op == 0xc8)
            {
              /* Pop FPA registers.  */
              op = next_unwind_byte (uws);
              op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_FPA, op, _UVRSD_FPAX)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          if (op == 0xc9)
            {
              /* Pop VFP registers with fldmd.  */
              op = next_unwind_byte (uws);
              op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_DOUBLE)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          /* Spare.  */
          return _URC_FAILURE;
        }
      if ((op & 0xf8) == 0xd0)
        {
          /* Pop VFP D[8]-D[8+nnn] with fldmd.  */
          op = 0x80000 | ((op & 7) + 1);
          if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_DOUBLE)
              != _UVRSR_OK)
            return _URC_FAILURE;
          continue;
        }
      /* Spare.  */
      return _URC_FAILURE;
    }
  return _URC_OK;
}
 
 
/* Execute the unwinding instructions associated with a frame.  UCBP and
   CONTEXT are the current exception object and virtual CPU state
   respectively.  */
 
_Unwind_Reason_Code
__gnu_unwind_frame (_Unwind_Control_Block * ucbp, _Unwind_Context * context)
{
  _uw *ptr;
  __gnu_unwind_state uws;
 
  ptr = (_uw *) ucbp->pr_cache.ehtp;
  /* Skip over the personality routine address.  */
  ptr++;
  /* Setup the unwinder state.  */
  uws.data = (*ptr) << 8;
  uws.next = ptr + 1;
  uws.bytes_left = 3;
  uws.words_left = ((*ptr) >> 24) & 0xff;
 
  return __gnu_unwind_execute (context, &uws);
}
 
/* Get the _Unwind_Control_Block from an _Unwind_Context.  */
 
static inline _Unwind_Control_Block *
unwind_UCB_from_context (_Unwind_Context * context)
{
  return (_Unwind_Control_Block *) _Unwind_GetGR (context, R_IP);
}
 
/* Get the start address of the function being unwound.  */
 
_Unwind_Ptr
_Unwind_GetRegionStart (_Unwind_Context * context)
{
  _Unwind_Control_Block *ucbp;
 
  ucbp = unwind_UCB_from_context (context);
  return (_Unwind_Ptr) ucbp->pr_cache.fnstart;
}
 
/* Find the Language specific exception data.  */
 
void *
_Unwind_GetLanguageSpecificData (_Unwind_Context * context)
{
  _Unwind_Control_Block *ucbp;
  _uw *ptr;
 
  /* Get a pointer to the exception table entry.  */
  ucbp = unwind_UCB_from_context (context);
  ptr = (_uw *) ucbp->pr_cache.ehtp;
  /* Skip the personality routine address.  */
  ptr++;
  /* Skip the unwind opcodes.  */
  ptr += (((*ptr) >> 24) & 0xff) + 1;
 
  return ptr;
}
 

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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [config/] [arm/] [pr-support.c] - Blame information for rev 856

Line No.	Rev	Author	Line
1	38	julius	`/* ARM EABI compliant unwinding routines`
2			`Copyright (C) 2004, 2005 Free Software Foundation, Inc.`
3			`Contributed by Paul Brook`
4
5			`This file is free software; you can redistribute it and/or modify it`
6			`under the terms of the GNU General Public License as published by the`
7			`Free Software Foundation; either version 2, or (at your option) any`
8			`later version.`
9
10			`In addition to the permissions in the GNU General Public License, the`
11			`Free Software Foundation gives you unlimited permission to link the`
12			`compiled version of this file into combinations with other programs,`
13			`and to distribute those combinations without any restriction coming`
14			`from the use of this file. (The General Public License restrictions`
15			`do apply in other respects; for example, they cover modification of`
16			`the file, and distribution when not linked into a combine`
17			`executable.)`
18
19			`This file is distributed in the hope that it will be useful, but`
20			`WITHOUT ANY WARRANTY; without even the implied warranty of`
21			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
22			`General Public License for more details.`
23
24			`You should have received a copy of the GNU General Public License`
25			`along with this program; see the file COPYING. If not, write to`
26			`the Free Software Foundation, 51 Franklin Street, Fifth Floor,`
27			`Boston, MA 02110-1301, USA. */`
28			`#include "unwind.h"`
29
30			`/* We add a prototype for abort here to avoid creating a dependency on`
31			`target headers. */`
32			`extern void abort (void);`
33
34			`typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */`
35
36			`/* Misc constants. */`
37			`#define R_IP 12`
38			`#define R_SP 13`
39			`#define R_LR 14`
40			`#define R_PC 15`
41
42			`#define uint32_highbit (((_uw) 1) << 31)`
43
44			`void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);`
45
46			`/* Unwind descriptors. */`
47
48			`typedef struct`
49			`{`
50			`_uw16 length;`
51			`_uw16 offset;`
52			`} EHT16;`
53
54			`typedef struct`
55			`{`
56			`_uw length;`
57			`_uw offset;`
58			`} EHT32;`
59
60			`/* Calculate the address encoded by a 31-bit self-relative offset at address`
61			`P. Copy of routine in unwind-arm.c. */`
62
63			`static inline _uw`
64			`selfrel_offset31 (const _uw *p)`
65			`{`
66			`_uw offset;`
67
68			`offset = *p;`
69			`/* Sign extend to 32 bits. */`
70			`if (offset & (1 << 30))`
71			`offset \|= 1u << 31;`
72
73			`return offset + (_uw) p;`
74			`}`
75
76
77			`/* Personality routine helper functions. */`
78
79			`#define CODE_FINISH (0xb0)`
80
81			`/* Return the next byte of unwinding information, or CODE_FINISH if there is`
82			`no data remaining. */`
83			`static inline _uw8`
84			`next_unwind_byte (__gnu_unwind_state * uws)`
85			`{`
86			`_uw8 b;`
87
88			`if (uws->bytes_left == 0)`
89			`{`
90			`/* Load another word */`
91			`if (uws->words_left == 0)`
92			`return CODE_FINISH; /* Nothing left. */`
93			`uws->words_left--;`
94			`uws->data = *(uws->next++);`
95			`uws->bytes_left = 3;`
96			`}`
97			`else`
98			`uws->bytes_left--;`
99
100			`/* Extract the most significant byte. */`
101			`b = (uws->data >> 24) & 0xff;`
102			`uws->data <<= 8;`
103			`return b;`
104			`}`
105
106			`/* Execute the unwinding instructions described by UWS. */`
107			`_Unwind_Reason_Code`
108			`__gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws)`
109			`{`
110			`_uw op;`
111			`int set_pc;`
112			`_uw reg;`
113
114			`set_pc = 0;`
115			`for (;;)`
116			`{`
117			`op = next_unwind_byte (uws);`
118			`if (op == CODE_FINISH)`
119			`{`
120			`/* If we haven't already set pc then copy it from lr. */`
121			`if (!set_pc)`
122			`{`
123			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_LR, _UVRSD_UINT32,`
124			`&reg);`
125			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32,`
126			`&reg);`
127			`set_pc = 1;`
128			`}`
129			`/* Drop out of the loop. */`
130			`break;`
131			`}`
132			`if ((op & 0x80) == 0)`
133			`{`
134			`/* vsp = vsp +- (imm6 << 2 + 4). */`
135			`_uw offset;`
136
137			`offset = ((op & 0x3f) << 2) + 4;`
138			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);`
139			`if (op & 0x40)`
140			`reg -= offset;`
141			`else`
142			`reg += offset;`
143			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);`
144			`continue;`
145			`}`
146
147			`if ((op & 0xf0) == 0x80)`
148			`{`
149			`op = (op << 8) \| next_unwind_byte (uws);`
150			`if (op == 0x8000)`
151			`{`
152			`/* Refuse to unwind. */`
153			`return _URC_FAILURE;`
154			`}`
155			`/* Pop r4-r15 under mask. */`
156			`op = (op << 4) & 0xfff0;`
157			`if (_Unwind_VRS_Pop (context, _UVRSC_CORE, op, _UVRSD_UINT32)`
158			`!= _UVRSR_OK)`
159			`return _URC_FAILURE;`
160			`if (op & (1 << R_PC))`
161			`set_pc = 1;`
162			`continue;`
163			`}`
164			`if ((op & 0xf0) == 0x90)`
165			`{`
166			`op &= 0xf;`
167			`if (op == 13 \|\| op == 15)`
168			`/* Reserved. */`
169			`return _URC_FAILURE;`
170			`/* vsp = r[nnnn]. */`
171			`_Unwind_VRS_Get (context, _UVRSC_CORE, op, _UVRSD_UINT32, &reg);`
172			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);`
173			`continue;`
174			`}`
175			`if ((op & 0xf0) == 0xa0)`
176			`{`
177			`/* Pop r4-r[4+nnn], [lr]. */`
178			`_uw mask;`
179
180			`mask = (0xff0 >> (7 - (op & 7))) & 0xff0;`
181			`if (op & 8)`
182			`mask \|= (1 << R_LR);`
183			`if (_Unwind_VRS_Pop (context, _UVRSC_CORE, mask, _UVRSD_UINT32)`
184			`!= _UVRSR_OK)`
185			`return _URC_FAILURE;`
186			`continue;`
187			`}`
188			`if ((op & 0xf0) == 0xb0)`
189			`{`
190			`/* op == 0xb0 already handled. */`
191			`if (op == 0xb1)`
192			`{`
193			`op = next_unwind_byte (uws);`
194			`if (op == 0 \|\| ((op & 0xf0) != 0))`
195			`/* Spare. */`
196			`return _URC_FAILURE;`
197			`/* Pop r0-r4 under mask. */`
198			`if (_Unwind_VRS_Pop (context, _UVRSC_CORE, op, _UVRSD_UINT32)`
199			`!= _UVRSR_OK)`
200			`return _URC_FAILURE;`
201			`continue;`
202			`}`
203			`if (op == 0xb2)`
204			`{`
205			`/* vsp = vsp + 0x204 + (uleb128 << 2). */`
206			`int shift;`
207
208			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,`
209			`&reg);`
210			`op = next_unwind_byte (uws);`
211			`shift = 2;`
212			`while (op & 0x80)`
213			`{`
214			`reg += ((op & 0x7f) << shift);`
215			`shift += 7;`
216			`op = next_unwind_byte (uws);`
217			`}`
218			`reg += ((op & 0x7f) << shift) + 0x204;`
219			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,`
220			`&reg);`
221			`continue;`
222			`}`
223			`if (op == 0xb3)`
224			`{`
225			`/* Pop VFP registers with fldmx. */`
226			`op = next_unwind_byte (uws);`
227			`op = ((op & 0xf0) << 12) \| ((op & 0xf) + 1);`
228			`if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_VFPX)`
229			`!= _UVRSR_OK)`
230			`return _URC_FAILURE;`
231			`continue;`
232			`}`
233			`if ((op & 0xfc) == 0xb4)`
234			`{`
235			`/* Pop FPA E[4]-E[4+nn]. */`
236			`op = 0x40000 \| ((op & 3) + 1);`
237			`if (_Unwind_VRS_Pop (context, _UVRSC_FPA, op, _UVRSD_FPAX)`
238			`!= _UVRSR_OK)`
239			`return _URC_FAILURE;`
240			`continue;`
241			`}`
242			`/* op & 0xf8 == 0xb8. */`
243			`/* Pop VFP D[8]-D[8+nnn] with fldmx. */`
244			`op = 0x80000 \| ((op & 7) + 1);`
245			`if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_VFPX)`
246			`!= _UVRSR_OK)`
247			`return _URC_FAILURE;`
248			`continue;`
249			`}`
250			`if ((op & 0xf0) == 0xc0)`
251			`{`
252			`if (op == 0xc6)`
253			`{`
254			`/* Pop iWMMXt D registers. */`
255			`op = next_unwind_byte (uws);`
256			`op = ((op & 0xf0) << 12) \| ((op & 0xf) + 1);`
257			`if (_Unwind_VRS_Pop (context, _UVRSC_WMMXD, op, _UVRSD_UINT64)`
258			`!= _UVRSR_OK)`
259			`return _URC_FAILURE;`
260			`continue;`
261			`}`
262			`if (op == 0xc7)`
263			`{`
264			`op = next_unwind_byte (uws);`
265			`if (op == 0 \|\| (op & 0xf0) != 0)`
266			`/* Spare. */`
267			`return _URC_FAILURE;`
268			`/* Pop iWMMXt wCGR{3,2,1,0} under mask. */`
269			`if (_Unwind_VRS_Pop (context, _UVRSC_WMMXC, op, _UVRSD_UINT32)`
270			`!= _UVRSR_OK)`
271			`return _URC_FAILURE;`
272			`continue;`
273			`}`
274			`if ((op & 0xf8) == 0xc0)`
275			`{`
276			`/* Pop iWMMXt wR[10]-wR[10+nnn]. */`
277			`op = 0xa0000 \| ((op & 0xf) + 1);`
278			`if (_Unwind_VRS_Pop (context, _UVRSC_WMMXD, op, _UVRSD_UINT64)`
279			`!= _UVRSR_OK)`
280			`return _URC_FAILURE;`
281			`continue;`
282			`}`
283			`if (op == 0xc8)`
284			`{`
285			`/* Pop FPA registers. */`
286			`op = next_unwind_byte (uws);`
287			`op = ((op & 0xf0) << 12) \| ((op & 0xf) + 1);`
288			`if (_Unwind_VRS_Pop (context, _UVRSC_FPA, op, _UVRSD_FPAX)`
289			`!= _UVRSR_OK)`
290			`return _URC_FAILURE;`
291			`continue;`
292			`}`
293			`if (op == 0xc9)`
294			`{`
295			`/* Pop VFP registers with fldmd. */`
296			`op = next_unwind_byte (uws);`
297			`op = ((op & 0xf0) << 12) \| ((op & 0xf) + 1);`
298			`if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_DOUBLE)`
299			`!= _UVRSR_OK)`
300			`return _URC_FAILURE;`
301			`continue;`
302			`}`
303			`/* Spare. */`
304			`return _URC_FAILURE;`
305			`}`
306			`if ((op & 0xf8) == 0xd0)`
307			`{`
308			`/* Pop VFP D[8]-D[8+nnn] with fldmd. */`
309			`op = 0x80000 \| ((op & 7) + 1);`
310			`if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_DOUBLE)`
311			`!= _UVRSR_OK)`
312			`return _URC_FAILURE;`
313			`continue;`
314			`}`
315			`/* Spare. */`
316			`return _URC_FAILURE;`
317			`}`
318			`return _URC_OK;`
319			`}`
320
321
322			`/* Execute the unwinding instructions associated with a frame. UCBP and`
323			`CONTEXT are the current exception object and virtual CPU state`
324			`respectively. */`
325
326			`_Unwind_Reason_Code`
327			`__gnu_unwind_frame (_Unwind_Control_Block * ucbp, _Unwind_Context * context)`
328			`{`
329			`_uw *ptr;`
330			`__gnu_unwind_state uws;`
331
332			`ptr = (_uw *) ucbp->pr_cache.ehtp;`
333			`/* Skip over the personality routine address. */`
334			`ptr++;`
335			`/* Setup the unwinder state. */`
336			`uws.data = (*ptr) << 8;`
337			`uws.next = ptr + 1;`
338			`uws.bytes_left = 3;`
339			`uws.words_left = ((*ptr) >> 24) & 0xff;`
340
341			`return __gnu_unwind_execute (context, &uws);`
342			`}`
343
344			`/* Get the _Unwind_Control_Block from an _Unwind_Context. */`
345
346			`static inline _Unwind_Control_Block *`
347			`unwind_UCB_from_context (_Unwind_Context * context)`
348			`{`
349			`return (_Unwind_Control_Block *) _Unwind_GetGR (context, R_IP);`
350			`}`
351
352			`/* Get the start address of the function being unwound. */`
353
354			`_Unwind_Ptr`
355			`_Unwind_GetRegionStart (_Unwind_Context * context)`
356			`{`
357			`_Unwind_Control_Block *ucbp;`
358
359			`ucbp = unwind_UCB_from_context (context);`
360			`return (_Unwind_Ptr) ucbp->pr_cache.fnstart;`
361			`}`
362
363			`/* Find the Language specific exception data. */`
364
365			`void *`
366			`_Unwind_GetLanguageSpecificData (_Unwind_Context * context)`
367			`{`
368			`_Unwind_Control_Block *ucbp;`
369			`_uw *ptr;`
370
371			`/* Get a pointer to the exception table entry. */`
372			`ucbp = unwind_UCB_from_context (context);`
373			`ptr = (_uw *) ucbp->pr_cache.ehtp;`
374			`/* Skip the personality routine address. */`
375			`ptr++;`
376			`/* Skip the unwind opcodes. */`
377			`ptr += (((*ptr) >> 24) & 0xff) + 1;`
378
379			`return ptr;`
380			`}`
381