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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgcc/] [config/] [pa/] [hpux-unwind.h] - Blame information for rev 773

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1 734 jeremybenn
/* DWARF2 EH unwinding support for PA HP-UX.
2
   Copyright (C) 2005, 2009 Free Software Foundation, Inc.
3
 
4
This file is part of GCC.
5
 
6
GCC is free software; you can redistribute it and/or modify
7
it under the terms of the GNU General Public License as published by
8
the Free Software Foundation; either version 3, or (at your option)
9
any later version.
10
 
11
GCC is distributed in the hope that it will be useful,
12
but WITHOUT ANY WARRANTY; without even the implied warranty of
13
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
GNU General Public License for more details.
15
 
16
Under Section 7 of GPL version 3, you are granted additional
17
permissions described in the GCC Runtime Library Exception, version
18
3.1, as published by the Free Software Foundation.
19
 
20
You should have received a copy of the GNU General Public License and
21
a copy of the GCC Runtime Library Exception along with this program;
22
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23
<http://www.gnu.org/licenses/>.  */
24
 
25
/* Do code reading to identify a signal frame, and set the frame
26
   state data appropriately.  See unwind-dw2.c for the structs.  */
27
 
28
/* Don't use this if inhibit_libc is set.
29
   The build for this target will fail trying to include missing headers. */
30
#ifndef inhibit_libc
31
#include <signal.h>
32
#include <sys/ucontext.h>
33
#include <unistd.h>
34
 
35
/* FIXME: We currently ignore the high halves of general, space and
36
   control registers on PA 2.0 machines for applications using the
37
   32-bit runtime.  We don't restore space registers or the floating
38
   point status registers.  */
39
 
40
#define MD_FALLBACK_FRAME_STATE_FOR pa_fallback_frame_state
41
 
42
/* HP-UX 10.X doesn't define GetSSReg.  */
43
#ifndef GetSSReg
44
#define GetSSReg(ssp, ss_reg) \
45
  ((UseWideRegs (ssp))                                                  \
46
   ? (ssp)->ss_wide.ss_32.ss_reg ## _lo                                 \
47
   : (ssp)->ss_narrow.ss_reg)
48
#endif
49
 
50
#if TARGET_64BIT
51
#define GetSSRegAddr(ssp, ss_reg) ((long) &((ssp)->ss_wide.ss_64.ss_reg))
52
#else
53
#define GetSSRegAddr(ssp, ss_reg) \
54
  ((UseWideRegs (ssp))                                                  \
55
   ? (long) &((ssp)->ss_wide.ss_32.ss_reg ## _lo)                       \
56
   : (long) &((ssp)->ss_narrow.ss_reg))
57
#endif
58
 
59
#define UPDATE_FS_FOR_SAR(FS, N) \
60
  (FS)->regs.reg[N].how = REG_SAVED_OFFSET;                             \
61
  (FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_cr11) - new_cfa
62
 
63
#define UPDATE_FS_FOR_GR(FS, GRN, N) \
64
  (FS)->regs.reg[N].how = REG_SAVED_OFFSET;                             \
65
  (FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_gr##GRN) - new_cfa
66
 
67
#define UPDATE_FS_FOR_FR(FS, FRN, N) \
68
  (FS)->regs.reg[N].how = REG_SAVED_OFFSET;                             \
69
  (FS)->regs.reg[N].loc.offset = (long) &(mc->ss_fr##FRN) - new_cfa;
70
 
71
#define UPDATE_FS_FOR_PC(FS, N) \
72
  (FS)->regs.reg[N].how = REG_SAVED_OFFSET;                             \
73
  (FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_pcoq_head) - new_cfa
74
 
75
/* Extract bit field from word using HP's numbering (MSB = 0).  */
76
#define GET_FIELD(X, FROM, TO) \
77
  ((X) >> (31 - (TO)) & ((1 << ((TO) - (FROM) + 1)) - 1))
78
 
79
static inline int
80
sign_extend (int x, int len)
81
{
82
  int signbit = (1 << (len - 1));
83
  int mask = (signbit << 1) - 1;
84
  return ((x & mask) ^ signbit) - signbit;
85
}
86
 
87
/* Extract a 17-bit signed constant from branch instructions.  */
88
static inline int
89
extract_17 (unsigned word)
90
{
91
  return sign_extend (GET_FIELD (word, 19, 28)
92
                      | GET_FIELD (word, 29, 29) << 10
93
                      | GET_FIELD (word, 11, 15) << 11
94
                      | (word & 0x1) << 16, 17);
95
}
96
 
97
/* Extract a 22-bit signed constant from branch instructions.  */
98
static inline int
99
extract_22 (unsigned word)
100
{
101
  return sign_extend (GET_FIELD (word, 19, 28)
102
                      | GET_FIELD (word, 29, 29) << 10
103
                      | GET_FIELD (word, 11, 15) << 11
104
                      | GET_FIELD (word, 6, 10) << 16
105
                      | (word & 0x1) << 21, 22);
106
}
107
 
108
static _Unwind_Reason_Code
109
pa_fallback_frame_state (struct _Unwind_Context *context,
110
                         _Unwind_FrameState *fs)
111
{
112
  static long cpu;
113
  unsigned int *pc = (unsigned int *) context->ra;
114
 
115
  if (pc == 0)
116
    return _URC_END_OF_STACK;
117
 
118
  /* Check for relocation of the return value.  */
119
  if (!TARGET_64BIT
120
      && *(pc + 0) == 0x2fd01224         /* fstd,ma fr4,8(sp) */
121
      && *(pc + 1) == 0x0fd9109d                /* ldw -4(sp),ret1 */
122
      && *(pc + 2) == 0x0fd130bc)               /* ldw,mb -8(sp),ret0 */
123
    pc += 3;
124
  else if (!TARGET_64BIT
125
           && *(pc + 0) == 0x27d01224            /* fstw,ma fr4,8(sp) */
126
           && *(pc + 1) == 0x0fd130bc)          /* ldw,mb -8(sp),ret0 */
127
    pc += 2;
128
  else if (!TARGET_64BIT
129
           && *(pc + 0) == 0x0fdc12b0            /* stw,ma ret0,8(sp) */
130
           && *(pc + 1) == 0x0fdd1299           /* stw ret1,-4(sp) */
131
           && *(pc + 2) == 0x2fd13024)          /* fldd,mb -8(sp),fr4 */
132
    pc += 3;
133
  else if (!TARGET_64BIT
134
           && *(pc + 0) == 0x0fdc12b0            /* stw,ma ret0,8(sp) */
135
           && *(pc + 1) == 0x27d13024)          /* fldw,mb -8(sp),fr4 */
136
    pc += 2;
137
 
138
  /* Check if the return address points to an export stub (PA 1.1 or 2.0).  */
139
  if ((!TARGET_64BIT
140
       && *(pc + 0) == 0x4bc23fd1                /* ldw -18(sp),rp */
141
       && *(pc + 1) == 0x004010a1               /* ldsid (rp),r1 */
142
       && *(pc + 2) == 0x00011820               /* mtsp r1,sr0 */
143
       && *(pc + 3) == 0xe0400002)              /* be,n 0(sr0,rp) */
144
      ||
145
      (!TARGET_64BIT
146
       && *(pc + 0) == 0x4bc23fd1                /* ldw -18(sp),rp */
147
       && *(pc + 1) == 0xe840d002))             /* bve,n (rp) */
148
    {
149
      fs->regs.cfa_how    = CFA_REG_OFFSET;
150
      fs->regs.cfa_reg    = 30;
151
      fs->regs.cfa_offset = 0;
152
 
153
      fs->retaddr_column = 0;
154
      fs->regs.reg[0].how = REG_SAVED_OFFSET;
155
      fs->regs.reg[0].loc.offset = -24;
156
 
157
      /* Update context to describe the stub frame.  */
158
      uw_update_context (context, fs);
159
 
160
      /* Set up fs to describe the FDE for the caller of this stub.  */
161
      return uw_frame_state_for (context, fs);
162
    }
163
  /* Check if the return address points to a relocation stub.  */
164
  else if (!TARGET_64BIT
165
           && *(pc + 0) == 0x0fd11082            /* ldw -8(sp),rp */
166
           && (*(pc + 1) == 0xe840c002          /* bv,n r0(rp) */
167
               || *(pc + 1) == 0xe840d002))     /* bve,n (rp) */
168
    {
169
      fs->regs.cfa_how    = CFA_REG_OFFSET;
170
      fs->regs.cfa_reg    = 30;
171
      fs->regs.cfa_offset = 0;
172
 
173
      fs->retaddr_column = 0;
174
      fs->regs.reg[0].how = REG_SAVED_OFFSET;
175
      fs->regs.reg[0].loc.offset = -8;
176
 
177
      /* Update context to describe the stub frame.  */
178
      uw_update_context (context, fs);
179
 
180
      /* Set up fs to describe the FDE for the caller of this stub.  */
181
      return uw_frame_state_for (context, fs);
182
    }
183
 
184
  /* Check if the return address is an export stub as signal handlers
185
     may return via an export stub.  */
186
  if (!TARGET_64BIT
187
      && (*pc & 0xffe0e002) == 0xe8400000       /* bl x,r2 */
188
      && *(pc + 1) == 0x08000240                /* nop */
189
      && *(pc + 2) == 0x4bc23fd1                /* ldw -18(sp),rp */
190
      && *(pc + 3) == 0x004010a1                /* ldsid (rp),r1 */
191
      && *(pc + 4) == 0x00011820                /* mtsp r1,sr0 */
192
      && *(pc + 5) == 0xe0400002)               /* be,n 0(sr0,rp) */
193
    /* Extract target address from PA 1.x 17-bit branch.  */
194
    pc += extract_17 (*pc) + 2;
195
  else if (!TARGET_64BIT
196
           && (*pc & 0xfc00e002) == 0xe800a000  /* b,l x,r2 */
197
           && *(pc + 1) == 0x08000240           /* nop */
198
           && *(pc + 2) == 0x4bc23fd1           /* ldw -18(sp),rp */
199
           && *(pc + 3) == 0xe840d002)          /* bve,n (rp) */
200
    /* Extract target address from PA 2.0 22-bit branch.  */
201
    pc += extract_22 (*pc) + 2;
202
 
203
  /* Now check if the return address is one of the signal handler
204
     returns, _sigreturn or _sigsetreturn.  */
205
  if ((TARGET_64BIT
206
       && *(pc + 0)  == 0x53db3f51               /* ldd -58(sp),dp */
207
       && *(pc + 8)  == 0x34160116              /* ldi 8b,r22 */
208
       && *(pc + 9)  == 0x08360ac1              /* shladd,l r22,3,r1,r1 */
209
       && *(pc + 10) == 0x0c2010c1              /* ldd 0(r1),r1 */
210
       && *(pc + 11) == 0xe4202000)             /* be,l 0(sr4,r1) */
211
      ||
212
      (TARGET_64BIT
213
       && *(pc + 0)  == 0x36dc0000               /* ldo 0(r22),ret0 */
214
       && *(pc + 6)  == 0x341601c0              /* ldi e0,r22 */
215
       && *(pc + 7)  == 0x08360ac1              /* shladd,l r22,3,r1,r1 */
216
       && *(pc + 8)  == 0x0c2010c1              /* ldd 0(r1),r1 */
217
       && *(pc + 9)  == 0xe4202000)             /* be,l 0(sr4,r1) */
218
      ||
219
      (!TARGET_64BIT
220
       && *(pc + 0)  == 0x379a0000               /* ldo 0(ret0),r26 */
221
       && *(pc + 1)  == 0x6bd33fc9              /* stw r19,-1c(sp) */
222
       && *(pc + 2)  == 0x20200801              /* ldil L%-40000000,r1 */
223
       && *(pc + 3)  == 0xe420e008              /* be,l 4(sr7,r1) */
224
       && *(pc + 4)  == 0x34160116)             /* ldi 8b,r22 */
225
      ||
226
      (!TARGET_64BIT
227
       && *(pc + 0)  == 0x6bd33fc9               /* stw r19,-1c(sp) */
228
       && *(pc + 1)  == 0x20200801              /* ldil L%-40000000,r1 */
229
       && *(pc + 2)  == 0xe420e008              /* be,l 4(sr7,r1) */
230
       && *(pc + 3)  == 0x341601c0))            /* ldi e0,r22 */
231
    {
232
      /* The previous stack pointer is saved at (long *)SP - 1.  The
233
         ucontext structure is offset from the start of the previous
234
         frame by the siglocal_misc structure.  */
235
      struct siglocalx *sl = (struct siglocalx *)
236
        (*((long *) context->cfa - 1));
237
      mcontext_t *mc = &(sl->sl_uc.uc_mcontext);
238
 
239
      long new_cfa = GetSSReg (mc, ss_sp);
240
 
241
      fs->regs.cfa_how = CFA_REG_OFFSET;
242
      fs->regs.cfa_reg = 30;
243
      fs->regs.cfa_offset = new_cfa - (long) context->cfa;
244
 
245
      UPDATE_FS_FOR_GR (fs, 1, 1);
246
      UPDATE_FS_FOR_GR (fs, 2, 2);
247
      UPDATE_FS_FOR_GR (fs, 3, 3);
248
      UPDATE_FS_FOR_GR (fs, 4, 4);
249
      UPDATE_FS_FOR_GR (fs, 5, 5);
250
      UPDATE_FS_FOR_GR (fs, 6, 6);
251
      UPDATE_FS_FOR_GR (fs, 7, 7);
252
      UPDATE_FS_FOR_GR (fs, 8, 8);
253
      UPDATE_FS_FOR_GR (fs, 9, 9);
254
      UPDATE_FS_FOR_GR (fs, 10, 10);
255
      UPDATE_FS_FOR_GR (fs, 11, 11);
256
      UPDATE_FS_FOR_GR (fs, 12, 12);
257
      UPDATE_FS_FOR_GR (fs, 13, 13);
258
      UPDATE_FS_FOR_GR (fs, 14, 14);
259
      UPDATE_FS_FOR_GR (fs, 15, 15);
260
      UPDATE_FS_FOR_GR (fs, 16, 16);
261
      UPDATE_FS_FOR_GR (fs, 17, 17);
262
      UPDATE_FS_FOR_GR (fs, 18, 18);
263
      UPDATE_FS_FOR_GR (fs, 19, 19);
264
      UPDATE_FS_FOR_GR (fs, 20, 20);
265
      UPDATE_FS_FOR_GR (fs, 21, 21);
266
      UPDATE_FS_FOR_GR (fs, 22, 22);
267
      UPDATE_FS_FOR_GR (fs, 23, 23);
268
      UPDATE_FS_FOR_GR (fs, 24, 24);
269
      UPDATE_FS_FOR_GR (fs, 25, 25);
270
      UPDATE_FS_FOR_GR (fs, 26, 26);
271
      UPDATE_FS_FOR_GR (fs, 27, 27);
272
      UPDATE_FS_FOR_GR (fs, 28, 28);
273
      UPDATE_FS_FOR_GR (fs, 29, 29);
274
      UPDATE_FS_FOR_GR (fs, 30, 30);
275
      UPDATE_FS_FOR_GR (fs, 31, 31);
276
 
277
      if (TARGET_64BIT)
278
        {
279
          UPDATE_FS_FOR_FR (fs, 4, 32);
280
          UPDATE_FS_FOR_FR (fs, 5, 33);
281
          UPDATE_FS_FOR_FR (fs, 6, 34);
282
          UPDATE_FS_FOR_FR (fs, 7, 35);
283
          UPDATE_FS_FOR_FR (fs, 8, 36);
284
          UPDATE_FS_FOR_FR (fs, 9, 37);
285
          UPDATE_FS_FOR_FR (fs, 10, 38);
286
          UPDATE_FS_FOR_FR (fs, 11, 39);
287
          UPDATE_FS_FOR_FR (fs, 12, 40);
288
          UPDATE_FS_FOR_FR (fs, 13, 41);
289
          UPDATE_FS_FOR_FR (fs, 14, 42);
290
          UPDATE_FS_FOR_FR (fs, 15, 43);
291
          UPDATE_FS_FOR_FR (fs, 16, 44);
292
          UPDATE_FS_FOR_FR (fs, 17, 45);
293
          UPDATE_FS_FOR_FR (fs, 18, 46);
294
          UPDATE_FS_FOR_FR (fs, 19, 47);
295
          UPDATE_FS_FOR_FR (fs, 20, 48);
296
          UPDATE_FS_FOR_FR (fs, 21, 49);
297
          UPDATE_FS_FOR_FR (fs, 22, 50);
298
          UPDATE_FS_FOR_FR (fs, 23, 51);
299
          UPDATE_FS_FOR_FR (fs, 24, 52);
300
          UPDATE_FS_FOR_FR (fs, 25, 53);
301
          UPDATE_FS_FOR_FR (fs, 26, 54);
302
          UPDATE_FS_FOR_FR (fs, 27, 55);
303
          UPDATE_FS_FOR_FR (fs, 28, 56);
304
          UPDATE_FS_FOR_FR (fs, 29, 57);
305
          UPDATE_FS_FOR_FR (fs, 30, 58);
306
          UPDATE_FS_FOR_FR (fs, 31, 59);
307
 
308
          UPDATE_FS_FOR_SAR (fs, 60);
309
        }
310
      else
311
        {
312
          UPDATE_FS_FOR_FR (fs, 4, 32);
313
          UPDATE_FS_FOR_FR (fs, 5, 34);
314
          UPDATE_FS_FOR_FR (fs, 6, 36);
315
          UPDATE_FS_FOR_FR (fs, 7, 38);
316
          UPDATE_FS_FOR_FR (fs, 8, 40);
317
          UPDATE_FS_FOR_FR (fs, 9, 44);
318
          UPDATE_FS_FOR_FR (fs, 10, 44);
319
          UPDATE_FS_FOR_FR (fs, 11, 46);
320
          UPDATE_FS_FOR_FR (fs, 12, 48);
321
          UPDATE_FS_FOR_FR (fs, 13, 50);
322
          UPDATE_FS_FOR_FR (fs, 14, 52);
323
          UPDATE_FS_FOR_FR (fs, 15, 54);
324
 
325
          if (!cpu)
326
            cpu = sysconf (_SC_CPU_VERSION);
327
 
328
          /* PA-RISC 1.0 only has 16 floating point registers.  */
329
          if (cpu != CPU_PA_RISC1_0)
330
            {
331
              UPDATE_FS_FOR_FR (fs, 16, 56);
332
              UPDATE_FS_FOR_FR (fs, 17, 58);
333
              UPDATE_FS_FOR_FR (fs, 18, 60);
334
              UPDATE_FS_FOR_FR (fs, 19, 62);
335
              UPDATE_FS_FOR_FR (fs, 20, 64);
336
              UPDATE_FS_FOR_FR (fs, 21, 66);
337
              UPDATE_FS_FOR_FR (fs, 22, 68);
338
              UPDATE_FS_FOR_FR (fs, 23, 70);
339
              UPDATE_FS_FOR_FR (fs, 24, 72);
340
              UPDATE_FS_FOR_FR (fs, 25, 74);
341
              UPDATE_FS_FOR_FR (fs, 26, 76);
342
              UPDATE_FS_FOR_FR (fs, 27, 78);
343
              UPDATE_FS_FOR_FR (fs, 28, 80);
344
              UPDATE_FS_FOR_FR (fs, 29, 82);
345
              UPDATE_FS_FOR_FR (fs, 30, 84);
346
              UPDATE_FS_FOR_FR (fs, 31, 86);
347
            }
348
 
349
          UPDATE_FS_FOR_SAR (fs, 88);
350
        }
351
 
352
      fs->retaddr_column = DWARF_ALT_FRAME_RETURN_COLUMN;
353
      UPDATE_FS_FOR_PC (fs, DWARF_ALT_FRAME_RETURN_COLUMN);
354
      fs->signal_frame = 1;
355
 
356
      return _URC_NO_REASON;
357
    }
358
 
359
  return _URC_END_OF_STACK;
360
}
361
#endif /* inhibit_libc */

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