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/* C6X ABI compliant unwinding routines
   Copyright (C) 2011 Free Software Foundation, Inc.
 
   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 3, or (at your option) any
   later version.
 
   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.
 
   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.
 
   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.  */
 
#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_A0 0
#define R_A1 1
#define R_A2 2
#define R_A3 3
#define R_A4 4
#define R_A5 5
#define R_A6 6
#define R_A7 7
#define R_A8 8
#define R_A9 9
#define R_A10 10
#define R_A11 11
#define R_A12 12
#define R_A13 13
#define R_A14 14
#define R_A15 15
#define R_B0 16
#define R_B1 17
#define R_B2 18
#define R_B3 19
#define R_B4 20
#define R_B5 21
#define R_B6 22
#define R_B7 23
#define R_B8 24
#define R_B9 25
#define R_B10 26
#define R_B11 27
#define R_B12 28
#define R_B13 29
#define R_B14 30
#define R_B15 31
 
#define R_SP R_B15
#define R_PC 33
 
#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 (0xe7)
 
/* 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;
}
 
static void
unwind_restore_pair (_Unwind_Context * context, int reg, _uw *ptr)
{
#ifdef _BIG_ENDIAN
  _Unwind_VRS_Set (context, _UVRSC_CORE, reg, _UVRSD_UINT32, ptr + 1);
  _Unwind_VRS_Set (context, _UVRSC_CORE, reg + 1, _UVRSD_UINT32, ptr);
#else
  _Unwind_VRS_Set (context, _UVRSC_CORE, reg, _UVRSD_UINT32, ptr);
  _Unwind_VRS_Set (context, _UVRSC_CORE, reg + 1, _UVRSD_UINT32, ptr + 1);
#endif
}
 
static const int
unwind_frame_regs[13] =
{
  R_A15, R_B15, R_B14, R_B13, R_B12, R_B11, R_B10, R_B3,
  R_A14, R_A13, R_A12, R_A11, R_A10
};
 
static void
pop_compact_frame (_Unwind_Context * context, _uw mask, _uw *ptr, int inc_sp)
{
  int size;
  _uw test;
  int i, regno, nregs;
 
  size = 0;
  nregs = __builtin_popcount (mask);
  for (i = 0; i < 13; i++)
    {
      test = 1 << i;
      if ((mask & test) == 0)
        continue;
 
      regno = unwind_frame_regs[12 - i];
 
      if (i < 12 && nregs > 2
          && (mask & (test << 1)) != 0
          && unwind_frame_regs[11 - i] == regno + 1
          && (regno & 1) == 0)
        {
          i++;
          nregs--;
        }
 
      nregs--;
      size += 2;
    }
 
  if (!inc_sp)
    ptr -= size;
 
  /* SP points just past the end of the stack.  */
  ptr += 2;
  nregs = __builtin_popcount (mask);
  for (i = 0; i < 13; i++)
    {
      test = 1 << i;
      if ((mask & test) == 0)
        continue;
 
      regno = unwind_frame_regs[12 - i];
 
      if (i < 12 && nregs > 2
          && (mask & (test << 1)) != 0
          && unwind_frame_regs[11 - i] == regno + 1
          && (regno & 1) == 0)
        {
          /* Register pair.  */
          unwind_restore_pair (context, regno, ptr);
          i++;
          nregs--;
        }
      else
        {
          /* Single register with padding.  */
          _Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32, ptr);
        }
 
      nregs--;
      ptr += 2;
    }
 
  ptr -= 2;
  if ((mask & (1 << 11)) == 0)
    _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);
}
 
static void
pop_frame (_Unwind_Context * context, _uw mask, _uw *ptr, int inc_sp)
{
  int i;
  int regno;
  int nregs;
 
  nregs = __builtin_popcount (mask);
 
  if (!inc_sp)
    ptr -= nregs;
  else if (nregs & 1)
    ptr++;
 
  ptr++;
  for (i = 0; i < 13; i++)
    {
      if ((mask & (1 << i)) == 0)
        continue;
      regno = unwind_frame_regs[12 - i];
      if (i < 12 && unwind_frame_regs[11 - i] == (regno + 1)
          && (mask & (1 << (i + 1))) != 0
          && (((_uw)ptr) & 4) == 0
          && (regno & 1) == 0)
        {
          unwind_restore_pair (context, regno, ptr);
          i++;
          ptr += 2;
        }
      else
        {
          _Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32,
                           ptr);
          ptr++;
        }
    }
 
  ptr--;
  if ((mask & (1 << 11)) == 0)
    _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);
}
 
/* Unwind a 24-bit encoded frame.  */
_Unwind_Reason_Code
__gnu_unwind_24bit (_Unwind_Context * context, _uw data, int compact)
{
  _uw offset;
  _uw mask;
  _uw *ptr;
  _uw tmp;
  int ret_reg = unwind_frame_regs[data & 0xf];
 
  if (ret_reg != R_B3)
    {
      _Unwind_VRS_Get (context, _UVRSC_CORE, unwind_frame_regs[data & 0xf],
                       _UVRSD_UINT32, &tmp);
      _Unwind_VRS_Set (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, &tmp);
    }
 
  mask = (data >> 4) & 0x1fff;
 
  offset = (data >> 17) & 0x7f;
  if (offset == 0x7f)
    _Unwind_VRS_Get (context, _UVRSC_CORE, R_A15, _UVRSD_UINT32, &ptr);
  else
    {
      _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);
      ptr += offset * 2;
    }
 
 
  if (compact)
    pop_compact_frame (context, mask, ptr, offset != 0x7f);
  else
    pop_frame (context, mask, ptr, offset != 0x7f);
 
  _Unwind_VRS_Get (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, &tmp);
  _Unwind_VRS_Set (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32, &tmp);
 
  return _URC_OK;
}
 
static void
unwind_pop_rts (_Unwind_Context * context)
{
  _uw *ptr;
 
  _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);
#ifdef _BIG_ENDIAN
  _Unwind_VRS_Set (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, ptr + 1);
#else
  _Unwind_VRS_Set (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, ptr + 2);
#endif
  ptr += 3;
  unwind_restore_pair (context, R_A10, ptr);
  ptr += 2;
  unwind_restore_pair (context, R_B10, ptr);
  ptr += 2;
  unwind_restore_pair (context, R_A12, ptr);
  ptr += 2;
  unwind_restore_pair (context, R_B12, ptr);
  ptr += 2;
  unwind_restore_pair (context, R_A14, ptr);
  ptr += 2;
  _Unwind_VRS_Set (context, _UVRSC_CORE, R_B14, _UVRSD_UINT32, ptr);
  _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);
  /* PC will be set by implicit RETURN opcode.  */
}
 
/* Execute the unwinding instructions described by UWS.  */
_Unwind_Reason_Code
__gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws)
{
  _uw op;
  int inc_sp;
  _uw reg;
  _uw *ptr;
 
  inc_sp = 1;
  for (;;)
    {
      op = next_unwind_byte (uws);
      if (op == CODE_FINISH)
        {
          /* Drop out of the loop.  */
          break;
        }
      if ((op & 0xc0) == 0)
        {
          /* sp += (imm6 << 3) + 8.  */
          _uw offset;
 
          offset = ((op & 0x3f) << 3) + 8;
          _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
          reg += offset;
          _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
          continue;
        }
 
      if (op == 0xd2)
        {
          /* vsp = vsp + 0x204 + (uleb128 << 2).  */
          int shift;
 
          _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
          op = next_unwind_byte (uws);
          shift = 3;
          while (op & 0x80)
            {
              reg += ((op & 0x7f) << shift);
              shift += 7;
              op = next_unwind_byte (uws);
            }
          reg += ((op & 0x7f) << shift) + 0x408;
          _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
          continue;
        }
 
      if ((op & 0xe0) == 0x80)
        {
          /* POP bitmask */
          _uw mask = ((op & 0x1f) << 8) | next_unwind_byte (uws);
 
          if (mask == 0)
            {
              /* CANTUNWIND */
              return _URC_FAILURE;
            }
 
          _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);
          pop_frame (context, mask, ptr, inc_sp);
          continue;
        }
 
      if ((op & 0xe0) == 0xa0)
        {
          /* POP bitmask (compact) */
          _uw mask = ((op & 0x1f) << 8) | next_unwind_byte (uws);
 
          _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);
          pop_compact_frame (context, mask, ptr, inc_sp);
          continue;
        }
 
      if ((op & 0xf0) == 0xc0)
        {
          /* POP registers */
          int nregs = op & 0xf;
 
          _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);
          while (nregs > 0)
            {
              op = next_unwind_byte (uws);
              if ((op >> 4) != 0xf)
                {
                  reg = unwind_frame_regs[op >> 4];
                  _Unwind_VRS_Set (context, _UVRSC_CORE, reg, _UVRSD_UINT32,
                                   ptr);
                  nregs--;
                }
              ptr--;
              if ((op & 0xf) != 0xf)
                {
                  reg = unwind_frame_regs[op & 0xf];
                  _Unwind_VRS_Set (context, _UVRSC_CORE, reg, _UVRSD_UINT32,
                                   ptr);
                  nregs--;
                }
              ptr--;
            }
 
          continue;
        }
 
      if (op == 0xd0)
        {
          /* MV FP, SP */
          inc_sp = 0;
          _Unwind_VRS_Get (context, _UVRSC_CORE, R_A15, _UVRSD_UINT32, &reg);
          _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
          continue;
        }
 
      if (op == 0xd1)
        {
          /* __cx6abi_pop_rts */
          unwind_pop_rts (context);
          break;
        }
 
      if ((op & 0xf0) == 0xe0)
        {
          /* B3 = reg.  RETURN case alreadh handled above.  */
          int regno = unwind_frame_regs[op & 0xf];
 
          _Unwind_VRS_Get (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &reg);
          _Unwind_VRS_Set (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, &reg);
          continue;
        }
 
      /* Reserved.  */
      return _URC_FAILURE;
    }
 
  /* Implicit RETURN.  */
  _Unwind_VRS_Get (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, &reg);
  _Unwind_VRS_Set (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32, &reg);
  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);
}
 
/* Data segment base pointer corresponding to the function catching
   the exception.  */
 
_Unwind_Ptr
_Unwind_GetDataRelBase (_Unwind_Context *context)
{
  return _Unwind_GetGR (context, R_B14);
}
 
/* This should never be used.  */
 
_Unwind_Ptr
_Unwind_GetTextRelBase (_Unwind_Context *context __attribute__ ((unused)))
{
  abort ();
}
 
/* Only used by gcc personality routines, so can rely on a value they hid
   there earlier.  */
_Unwind_Ptr
_Unwind_GetRegionStart (_Unwind_Context *context)
{
  _Unwind_Control_Block *ucbp;
 
  ucbp = (_Unwind_Control_Block *) _Unwind_GetGR (context, UNWIND_POINTER_REG);
  return (_Unwind_Ptr) ucbp->pr_cache.fnstart;
}
 
void *
_Unwind_GetLanguageSpecificData (_Unwind_Context *context)
{
  _Unwind_Control_Block *ucbp;
  _uw *ptr;
 
  ucbp = (_Unwind_Control_Block *) _Unwind_GetGR (context, UNWIND_POINTER_REG);
  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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Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgcc/] [config/] [c6x/] [pr-support.c] - Blame information for rev 734

Line No.	Rev	Author	Line
1	734	jeremybenn	`/* C6X ABI compliant unwinding routines`
2			`Copyright (C) 2011 Free Software Foundation, Inc.`
3
4			`This file is free software; you can redistribute it and/or modify it`
5			`under the terms of the GNU General Public License as published by the`
6			`Free Software Foundation; either version 3, or (at your option) any`
7			`later version.`
8
9			`This file is distributed in the hope that it will be useful, but`
10			`WITHOUT ANY WARRANTY; without even the implied warranty of`
11			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
12			`General Public License for more details.`
13
14			`Under Section 7 of GPL version 3, you are granted additional`
15			`permissions described in the GCC Runtime Library Exception, version`
16			`3.1, as published by the Free Software Foundation.`
17
18			`You should have received a copy of the GNU General Public License and`
19			`a copy of the GCC Runtime Library Exception along with this program;`
20			`see the files COPYING3 and COPYING.RUNTIME respectively. If not, see`
21			`<http://www.gnu.org/licenses/>. */`
22
23			`#include "unwind.h"`
24
25			`/* We add a prototype for abort here to avoid creating a dependency on`
26			`target headers. */`
27			`extern void abort (void);`
28
29			`typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */`
30
31			`/* Misc constants. */`
32			`#define R_A0 0`
33			`#define R_A1 1`
34			`#define R_A2 2`
35			`#define R_A3 3`
36			`#define R_A4 4`
37			`#define R_A5 5`
38			`#define R_A6 6`
39			`#define R_A7 7`
40			`#define R_A8 8`
41			`#define R_A9 9`
42			`#define R_A10 10`
43			`#define R_A11 11`
44			`#define R_A12 12`
45			`#define R_A13 13`
46			`#define R_A14 14`
47			`#define R_A15 15`
48			`#define R_B0 16`
49			`#define R_B1 17`
50			`#define R_B2 18`
51			`#define R_B3 19`
52			`#define R_B4 20`
53			`#define R_B5 21`
54			`#define R_B6 22`
55			`#define R_B7 23`
56			`#define R_B8 24`
57			`#define R_B9 25`
58			`#define R_B10 26`
59			`#define R_B11 27`
60			`#define R_B12 28`
61			`#define R_B13 29`
62			`#define R_B14 30`
63			`#define R_B15 31`
64
65			`#define R_SP R_B15`
66			`#define R_PC 33`
67
68			`#define uint32_highbit (((_uw) 1) << 31)`
69
70			`void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);`
71
72			`/* Unwind descriptors. */`
73
74			`typedef struct`
75			`{`
76			`_uw16 length;`
77			`_uw16 offset;`
78			`} EHT16;`
79
80			`typedef struct`
81			`{`
82			`_uw length;`
83			`_uw offset;`
84			`} EHT32;`
85
86			`/* Calculate the address encoded by a 31-bit self-relative offset at address`
87			`P. Copy of routine in unwind-arm.c. */`
88
89			`static inline _uw`
90			`selfrel_offset31 (const _uw *p)`
91			`{`
92			`_uw offset;`
93
94			`offset = *p;`
95			`/* Sign extend to 32 bits. */`
96			`if (offset & (1 << 30))`
97			`offset \|= 1u << 31;`
98
99			`return offset + (_uw) p;`
100			`}`
101
102
103			`/* Personality routine helper functions. */`
104
105			`#define CODE_FINISH (0xe7)`
106
107			`/* Return the next byte of unwinding information, or CODE_FINISH if there is`
108			`no data remaining. */`
109			`static inline _uw8`
110			`next_unwind_byte (__gnu_unwind_state * uws)`
111			`{`
112			`_uw8 b;`
113
114			`if (uws->bytes_left == 0)`
115			`{`
116			`/* Load another word */`
117			`if (uws->words_left == 0)`
118			`return CODE_FINISH; /* Nothing left. */`
119			`uws->words_left--;`
120			`uws->data = *(uws->next++);`
121			`uws->bytes_left = 3;`
122			`}`
123			`else`
124			`uws->bytes_left--;`
125
126			`/* Extract the most significant byte. */`
127			`b = (uws->data >> 24) & 0xff;`
128			`uws->data <<= 8;`
129			`return b;`
130			`}`
131
132			`static void`
133			`unwind_restore_pair (_Unwind_Context * context, int reg, _uw *ptr)`
134			`{`
135			`#ifdef _BIG_ENDIAN`
136			`_Unwind_VRS_Set (context, _UVRSC_CORE, reg, _UVRSD_UINT32, ptr + 1);`
137			`_Unwind_VRS_Set (context, _UVRSC_CORE, reg + 1, _UVRSD_UINT32, ptr);`
138			`#else`
139			`_Unwind_VRS_Set (context, _UVRSC_CORE, reg, _UVRSD_UINT32, ptr);`
140			`_Unwind_VRS_Set (context, _UVRSC_CORE, reg + 1, _UVRSD_UINT32, ptr + 1);`
141			`#endif`
142			`}`
143
144			`static const int`
145			`unwind_frame_regs[13] =`
146			`{`
147			`R_A15, R_B15, R_B14, R_B13, R_B12, R_B11, R_B10, R_B3,`
148			`R_A14, R_A13, R_A12, R_A11, R_A10`
149			`};`
150
151			`static void`
152			`pop_compact_frame (_Unwind_Context * context, _uw mask, _uw *ptr, int inc_sp)`
153			`{`
154			`int size;`
155			`_uw test;`
156			`int i, regno, nregs;`
157
158			`size = 0;`
159			`nregs = __builtin_popcount (mask);`
160			`for (i = 0; i < 13; i++)`
161			`{`
162			`test = 1 << i;`
163			`if ((mask & test) == 0)`
164			`continue;`
165
166			`regno = unwind_frame_regs[12 - i];`
167
168			`if (i < 12 && nregs > 2`
169			`&& (mask & (test << 1)) != 0`
170			`&& unwind_frame_regs[11 - i] == regno + 1`
171			`&& (regno & 1) == 0)`
172			`{`
173			`i++;`
174			`nregs--;`
175			`}`
176
177			`nregs--;`
178			`size += 2;`
179			`}`
180
181			`if (!inc_sp)`
182			`ptr -= size;`
183
184			`/* SP points just past the end of the stack. */`
185			`ptr += 2;`
186			`nregs = __builtin_popcount (mask);`
187			`for (i = 0; i < 13; i++)`
188			`{`
189			`test = 1 << i;`
190			`if ((mask & test) == 0)`
191			`continue;`
192
193			`regno = unwind_frame_regs[12 - i];`
194
195			`if (i < 12 && nregs > 2`
196			`&& (mask & (test << 1)) != 0`
197			`&& unwind_frame_regs[11 - i] == regno + 1`
198			`&& (regno & 1) == 0)`
199			`{`
200			`/* Register pair. */`
201			`unwind_restore_pair (context, regno, ptr);`
202			`i++;`
203			`nregs--;`
204			`}`
205			`else`
206			`{`
207			`/* Single register with padding. */`
208			`_Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32, ptr);`
209			`}`
210
211			`nregs--;`
212			`ptr += 2;`
213			`}`
214
215			`ptr -= 2;`
216			`if ((mask & (1 << 11)) == 0)`
217			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);`
218			`}`
219
220			`static void`
221			`pop_frame (_Unwind_Context * context, _uw mask, _uw *ptr, int inc_sp)`
222			`{`
223			`int i;`
224			`int regno;`
225			`int nregs;`
226
227			`nregs = __builtin_popcount (mask);`
228
229			`if (!inc_sp)`
230			`ptr -= nregs;`
231			`else if (nregs & 1)`
232			`ptr++;`
233
234			`ptr++;`
235			`for (i = 0; i < 13; i++)`
236			`{`
237			`if ((mask & (1 << i)) == 0)`
238			`continue;`
239			`regno = unwind_frame_regs[12 - i];`
240			`if (i < 12 && unwind_frame_regs[11 - i] == (regno + 1)`
241			`&& (mask & (1 << (i + 1))) != 0`
242			`&& (((_uw)ptr) & 4) == 0`
243			`&& (regno & 1) == 0)`
244			`{`
245			`unwind_restore_pair (context, regno, ptr);`
246			`i++;`
247			`ptr += 2;`
248			`}`
249			`else`
250			`{`
251			`_Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32,`
252			`ptr);`
253			`ptr++;`
254			`}`
255			`}`
256
257			`ptr--;`
258			`if ((mask & (1 << 11)) == 0)`
259			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);`
260			`}`
261
262			`/* Unwind a 24-bit encoded frame. */`
263			`_Unwind_Reason_Code`
264			`__gnu_unwind_24bit (_Unwind_Context * context, _uw data, int compact)`
265			`{`
266			`_uw offset;`
267			`_uw mask;`
268			`_uw *ptr;`
269			`_uw tmp;`
270			`int ret_reg = unwind_frame_regs[data & 0xf];`
271
272			`if (ret_reg != R_B3)`
273			`{`
274			`_Unwind_VRS_Get (context, _UVRSC_CORE, unwind_frame_regs[data & 0xf],`
275			`_UVRSD_UINT32, &tmp);`
276			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, &tmp);`
277			`}`
278
279			`mask = (data >> 4) & 0x1fff;`
280
281			`offset = (data >> 17) & 0x7f;`
282			`if (offset == 0x7f)`
283			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_A15, _UVRSD_UINT32, &ptr);`
284			`else`
285			`{`
286			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);`
287			`ptr += offset * 2;`
288			`}`
289
290
291			`if (compact)`
292			`pop_compact_frame (context, mask, ptr, offset != 0x7f);`
293			`else`
294			`pop_frame (context, mask, ptr, offset != 0x7f);`
295
296			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, &tmp);`
297			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32, &tmp);`
298
299			`return _URC_OK;`
300			`}`
301
302			`static void`
303			`unwind_pop_rts (_Unwind_Context * context)`
304			`{`
305			`_uw *ptr;`
306
307			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);`
308			`#ifdef _BIG_ENDIAN`
309			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, ptr + 1);`
310			`#else`
311			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, ptr + 2);`
312			`#endif`
313			`ptr += 3;`
314			`unwind_restore_pair (context, R_A10, ptr);`
315			`ptr += 2;`
316			`unwind_restore_pair (context, R_B10, ptr);`
317			`ptr += 2;`
318			`unwind_restore_pair (context, R_A12, ptr);`
319			`ptr += 2;`
320			`unwind_restore_pair (context, R_B12, ptr);`
321			`ptr += 2;`
322			`unwind_restore_pair (context, R_A14, ptr);`
323			`ptr += 2;`
324			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_B14, _UVRSD_UINT32, ptr);`
325			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);`
326			`/* PC will be set by implicit RETURN opcode. */`
327			`}`
328
329			`/* Execute the unwinding instructions described by UWS. */`
330			`_Unwind_Reason_Code`
331			`__gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws)`
332			`{`
333			`_uw op;`
334			`int inc_sp;`
335			`_uw reg;`
336			`_uw *ptr;`
337
338			`inc_sp = 1;`
339			`for (;;)`
340			`{`
341			`op = next_unwind_byte (uws);`
342			`if (op == CODE_FINISH)`
343			`{`
344			`/* Drop out of the loop. */`
345			`break;`
346			`}`
347			`if ((op & 0xc0) == 0)`
348			`{`
349			`/* sp += (imm6 << 3) + 8. */`
350			`_uw offset;`
351
352			`offset = ((op & 0x3f) << 3) + 8;`
353			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);`
354			`reg += offset;`
355			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);`
356			`continue;`
357			`}`
358
359			`if (op == 0xd2)`
360			`{`
361			`/* vsp = vsp + 0x204 + (uleb128 << 2). */`
362			`int shift;`
363
364			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);`
365			`op = next_unwind_byte (uws);`
366			`shift = 3;`
367			`while (op & 0x80)`
368			`{`
369			`reg += ((op & 0x7f) << shift);`
370			`shift += 7;`
371			`op = next_unwind_byte (uws);`
372			`}`
373			`reg += ((op & 0x7f) << shift) + 0x408;`
374			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);`
375			`continue;`
376			`}`
377
378			`if ((op & 0xe0) == 0x80)`
379			`{`
380			`/* POP bitmask */`
381			`_uw mask = ((op & 0x1f) << 8) \| next_unwind_byte (uws);`
382
383			`if (mask == 0)`
384			`{`
385			`/* CANTUNWIND */`
386			`return _URC_FAILURE;`
387			`}`
388
389			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);`
390			`pop_frame (context, mask, ptr, inc_sp);`
391			`continue;`
392			`}`
393
394			`if ((op & 0xe0) == 0xa0)`
395			`{`
396			`/* POP bitmask (compact) */`
397			`_uw mask = ((op & 0x1f) << 8) \| next_unwind_byte (uws);`
398
399			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);`
400			`pop_compact_frame (context, mask, ptr, inc_sp);`
401			`continue;`
402			`}`
403
404			`if ((op & 0xf0) == 0xc0)`
405			`{`
406			`/* POP registers */`
407			`int nregs = op & 0xf;`
408
409			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &ptr);`
410			`while (nregs > 0)`
411			`{`
412			`op = next_unwind_byte (uws);`
413			`if ((op >> 4) != 0xf)`
414			`{`
415			`reg = unwind_frame_regs[op >> 4];`
416			`_Unwind_VRS_Set (context, _UVRSC_CORE, reg, _UVRSD_UINT32,`
417			`ptr);`
418			`nregs--;`
419			`}`
420			`ptr--;`
421			`if ((op & 0xf) != 0xf)`
422			`{`
423			`reg = unwind_frame_regs[op & 0xf];`
424			`_Unwind_VRS_Set (context, _UVRSC_CORE, reg, _UVRSD_UINT32,`
425			`ptr);`
426			`nregs--;`
427			`}`
428			`ptr--;`
429			`}`
430
431			`continue;`
432			`}`
433
434			`if (op == 0xd0)`
435			`{`
436			`/* MV FP, SP */`
437			`inc_sp = 0;`
438			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_A15, _UVRSD_UINT32, &reg);`
439			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);`
440			`continue;`
441			`}`
442
443			`if (op == 0xd1)`
444			`{`
445			`/* __cx6abi_pop_rts */`
446			`unwind_pop_rts (context);`
447			`break;`
448			`}`
449
450			`if ((op & 0xf0) == 0xe0)`
451			`{`
452			`/* B3 = reg. RETURN case alreadh handled above. */`
453			`int regno = unwind_frame_regs[op & 0xf];`
454
455			`_Unwind_VRS_Get (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &reg);`
456			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, &reg);`
457			`continue;`
458			`}`
459
460			`/* Reserved. */`
461			`return _URC_FAILURE;`
462			`}`
463
464			`/* Implicit RETURN. */`
465			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_B3, _UVRSD_UINT32, &reg);`
466			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32, &reg);`
467			`return _URC_OK;`
468			`}`
469
470
471			`/* Execute the unwinding instructions associated with a frame. UCBP and`
472			`CONTEXT are the current exception object and virtual CPU state`
473			`respectively. */`
474
475			`_Unwind_Reason_Code`
476			`__gnu_unwind_frame (_Unwind_Control_Block * ucbp, _Unwind_Context * context)`
477			`{`
478			`_uw *ptr;`
479			`__gnu_unwind_state uws;`
480
481			`ptr = (_uw *) ucbp->pr_cache.ehtp;`
482			`/* Skip over the personality routine address. */`
483			`ptr++;`
484			`/* Setup the unwinder state. */`
485			`uws.data = (*ptr) << 8;`
486			`uws.next = ptr + 1;`
487			`uws.bytes_left = 3;`
488			`uws.words_left = ((*ptr) >> 24) & 0xff;`
489
490			`return __gnu_unwind_execute (context, &uws);`
491			`}`
492
493			`/* Data segment base pointer corresponding to the function catching`
494			`the exception. */`
495
496			`_Unwind_Ptr`
497			`_Unwind_GetDataRelBase (_Unwind_Context *context)`
498			`{`
499			`return _Unwind_GetGR (context, R_B14);`
500			`}`
501
502			`/* This should never be used. */`
503
504			`_Unwind_Ptr`
505			`_Unwind_GetTextRelBase (_Unwind_Context *context __attribute__ ((unused)))`
506			`{`
507			`abort ();`
508			`}`
509
510			`/* Only used by gcc personality routines, so can rely on a value they hid`
511			`there earlier. */`
512			`_Unwind_Ptr`
513			`_Unwind_GetRegionStart (_Unwind_Context *context)`
514			`{`
515			`_Unwind_Control_Block *ucbp;`
516
517			`ucbp = (_Unwind_Control_Block *) _Unwind_GetGR (context, UNWIND_POINTER_REG);`
518			`return (_Unwind_Ptr) ucbp->pr_cache.fnstart;`
519			`}`
520
521			`void *`
522			`_Unwind_GetLanguageSpecificData (_Unwind_Context *context)`
523			`{`
524			`_Unwind_Control_Block *ucbp;`
525			`_uw *ptr;`
526
527			`ucbp = (_Unwind_Control_Block *) _Unwind_GetGR (context, UNWIND_POINTER_REG);`
528			`ptr = (_uw *) ucbp->pr_cache.ehtp;`
529			`/* Skip the personality routine address. */`
530			`ptr++;`
531			`/* Skip the unwind opcodes. */`
532			`ptr += (((*ptr) >> 24) & 0xff) + 1;`
533
534			`return ptr;`
535			`}`