gcc/config/pa/hpux-unwind.h

   1 /* DWARF2 EH unwinding support for PA HP-UX.
   2    Copyright (C) 2005 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 2, or (at your option)
   9 any later version.
  10
  11 In addition to the permissions in the GNU General Public License, the
  12 Free Software Foundation gives you unlimited permission to link the
  13 compiled version of this file with other programs, and to distribute
  14 those programs without any restriction coming from the use of this
  15 file.  (The General Public License restrictions do apply in other
  16 respects; for example, they cover modification of the file, and
  17 distribution when not linked into another program.)
  18
  19 GCC is distributed in the hope that it will be useful,
  20 but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 GNU General Public License for more details.
  23
  24 You should have received a copy of the GNU General Public License
  25 along with GCC; 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
  29 /* Do code reading to identify a signal frame, and set the frame
  30    state data appropriately.  See unwind-dw2.c for the structs.  */
  31
  32 /* Don't use this if inhibit_libc is set.
  33    The build for this target will fail trying to include missing headers. */
  34 #ifndef inhibit_libc
  35 #include <signal.h>
  36 #include <sys/ucontext.h>
  37 #include <unistd.h>
  38
  39 /* FIXME: We currently ignore the high halves of general, space and
  40    control registers on PA 2.0 machines for applications using the
  41    32-bit runtime.  We don't restore space registers or the floating
  42    point status registers.  */
  43
  44 #define MD_FALLBACK_FRAME_STATE_FOR pa_fallback_frame_state
  45
  46 /* HP-UX 10.X doesn't define GetSSReg.  */
  47 #ifndef GetSSReg
  48 #define GetSSReg(ssp, ss_reg) \
  49   ((UseWideRegs (ssp))                                                  \
  50    ? (ssp)->ss_wide.ss_32.ss_reg ## _lo                                 \
  51    : (ssp)->ss_narrow.ss_reg)
  52 #endif
  53
  54 #if TARGET_64BIT
  55 #define GetSSRegAddr(ssp, ss_reg) ((long) &((ssp)->ss_wide.ss_64.ss_reg))
  56 #else
  57 #define GetSSRegAddr(ssp, ss_reg) \
  58   ((UseWideRegs (ssp))                                                  \
  59    ? (long) &((ssp)->ss_wide.ss_32.ss_reg ## _lo)                       \
  60    : (long) &((ssp)->ss_narrow.ss_reg))
  61 #endif
  62
  63 #define UPDATE_FS_FOR_SAR(FS, N) \
  64   (FS)->regs.reg[N].how = REG_SAVED_OFFSET;                             \
  65   (FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_cr11) - new_cfa
  66
  67 #define UPDATE_FS_FOR_GR(FS, GRN, N) \
  68   (FS)->regs.reg[N].how = REG_SAVED_OFFSET;                             \
  69   (FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_gr##GRN) - new_cfa
  70
  71 #define UPDATE_FS_FOR_FR(FS, FRN, N) \
  72   (FS)->regs.reg[N].how = REG_SAVED_OFFSET;                             \
  73   (FS)->regs.reg[N].loc.offset = (long) &(mc->ss_fr##FRN) - new_cfa;
  74
  75 #define UPDATE_FS_FOR_PC(FS, N) \
  76   (FS)->regs.reg[N].how = REG_SAVED_OFFSET;                             \
  77   (FS)->regs.reg[N].loc.offset = GetSSRegAddr (mc, ss_pcoq_head) - new_cfa
  78
  79 /* Extract bit field from word using HP's numbering (MSB = 0).  */
  80 #define GET_FIELD(X, FROM, TO) \
  81   ((X) >> (31 - (TO)) & ((1 << ((TO) - (FROM) + 1)) - 1))
  82
  83 static inline int
  84 sign_extend (int x, int len)
  85 {
  86   int signbit = (1 << (len - 1));
  87   int mask = (signbit << 1) - 1;
  88   return ((x & mask) ^ signbit) - signbit;
  89 }
  90
  91 /* Extract a 17-bit signed constant from branch instructions.  */
  92 static inline int
  93 extract_17 (unsigned word)
  94 {
  95   return sign_extend (GET_FIELD (word, 19, 28)
  96                       | GET_FIELD (word, 29, 29) << 10
  97                       | GET_FIELD (word, 11, 15) << 11
  98                       | (word & 0x1) << 16, 17);
  99 }
 100
 101 /* Extract a 22-bit signed constant from branch instructions.  */
 102 static inline int
 103 extract_22 (unsigned word)
 104 {
 105   return sign_extend (GET_FIELD (word, 19, 28)
 106                       | GET_FIELD (word, 29, 29) << 10
 107                       | GET_FIELD (word, 11, 15) << 11
 108                       | GET_FIELD (word, 6, 10) << 16
 109                       | (word & 0x1) << 21, 22);
 110 }
 111
 112 static _Unwind_Reason_Code
 113 pa_fallback_frame_state (struct _Unwind_Context *context,
 114                          _Unwind_FrameState *fs)
 115 {
 116   static long cpu;
 117   unsigned int *pc = (unsigned int *) context->ra;
 118
 119   if (pc == 0)
 120     return _URC_END_OF_STACK;
 121
 122   /* Check for relocation of the return value.  */
 123   if (!TARGET_64BIT
 124       && *(pc + 0) == 0x2fd01224                /* fstd,ma fr4,8(sp) */
 125       && *(pc + 1) == 0x0fd9109d                /* ldw -4(sp),ret1 */
 126       && *(pc + 2) == 0x0fd130bc)               /* ldw,mb -8(sp),ret0 */
 127     pc += 3;
 128   else if (!TARGET_64BIT
 129            && *(pc + 0) == 0x27d01224           /* fstw,ma fr4,8(sp) */
 130            && *(pc + 1) == 0x0fd130bc)          /* ldw,mb -8(sp),ret0 */
 131     pc += 2;
 132   else if (!TARGET_64BIT
 133            && *(pc + 0) == 0x0fdc12b0           /* stw,ma ret0,8(sp) */
 134            && *(pc + 1) == 0x0fdd1299           /* stw ret1,-4(sp) */
 135            && *(pc + 2) == 0x2fd13024)          /* fldd,mb -8(sp),fr4 */
 136     pc += 3;
 137   else if (!TARGET_64BIT
 138            && *(pc + 0) == 0x0fdc12b0           /* stw,ma ret0,8(sp) */
 139            && *(pc + 1) == 0x27d13024)          /* fldw,mb -8(sp),fr4 */
 140     pc += 2;
 141
 142   /* Check if the return address points to an export stub (PA 1.1 or 2.0).  */
 143   if ((!TARGET_64BIT
 144        && *(pc + 0) == 0x4bc23fd1               /* ldw -18(sp),rp */
 145        && *(pc + 1) == 0x004010a1               /* ldsid (rp),r1 */
 146        && *(pc + 2) == 0x00011820               /* mtsp r1,sr0 */
 147        && *(pc + 3) == 0xe0400002)              /* be,n 0(sr0,rp) */
 148       ||
 149       (!TARGET_64BIT
 150        && *(pc + 0) == 0x4bc23fd1               /* ldw -18(sp),rp */
 151        && *(pc + 1) == 0xe840d002))             /* bve,n (rp) */
 152     {
 153       fs->regs.cfa_how    = CFA_REG_OFFSET;
 154       fs->regs.cfa_reg    = 30;
 155       fs->regs.cfa_offset = 0;
 156
 157       fs->retaddr_column = 0;
 158       fs->regs.reg[0].how = REG_SAVED_OFFSET;
 159       fs->regs.reg[0].loc.offset = -24;
 160
 161       /* Update context to describe the stub frame.  */
 162       uw_update_context (context, fs);
 163
 164       /* Set up fs to describe the FDE for the caller of this stub.  */
 165       return uw_frame_state_for (context, fs);
 166     }
 167   /* Check if the return address points to a relocation stub.  */
 168   else if (!TARGET_64BIT
 169            && *(pc + 0) == 0x0fd11082           /* ldw -8(sp),rp */
 170            && (*(pc + 1) == 0xe840c002          /* bv,n r0(rp) */
 171                || *(pc + 1) == 0xe840d002))     /* bve,n (rp) */
 172     {
 173       fs->regs.cfa_how    = CFA_REG_OFFSET;
 174       fs->regs.cfa_reg    = 30;
 175       fs->regs.cfa_offset = 0;
 176
 177       fs->retaddr_column = 0;
 178       fs->regs.reg[0].how = REG_SAVED_OFFSET;
 179       fs->regs.reg[0].loc.offset = -8;
 180
 181       /* Update context to describe the stub frame.  */
 182       uw_update_context (context, fs);
 183
 184       /* Set up fs to describe the FDE for the caller of this stub.  */
 185       return uw_frame_state_for (context, fs);
 186     }
 187
 188   /* Check if the return address is an export stub as signal handlers
 189      may return via an export stub.  */
 190   if (!TARGET_64BIT
 191       && (*pc & 0xffe0e002) == 0xe8400000       /* bl x,r2 */
 192       && *(pc + 1) == 0x08000240                /* nop */
 193       && *(pc + 2) == 0x4bc23fd1                /* ldw -18(sp),rp */
 194       && *(pc + 3) == 0x004010a1                /* ldsid (rp),r1 */
 195       && *(pc + 4) == 0x00011820                /* mtsp r1,sr0 */
 196       && *(pc + 5) == 0xe0400002)               /* be,n 0(sr0,rp) */
 197     /* Extract target address from PA 1.x 17-bit branch.  */
 198     pc += extract_17 (*pc) + 2;
 199   else if (!TARGET_64BIT
 200            && (*pc & 0xfc00e002) == 0xe800a000  /* b,l x,r2 */
 201            && *(pc + 1) == 0x08000240           /* nop */
 202            && *(pc + 2) == 0x4bc23fd1           /* ldw -18(sp),rp */
 203            && *(pc + 3) == 0xe840d002)          /* bve,n (rp) */
 204     /* Extract target address from PA 2.0 22-bit branch.  */
 205     pc += extract_22 (*pc) + 2;
 206
 207   /* Now check if the return address is one of the signal handler
 208      returns, _sigreturn or _sigsetreturn.  */
 209   if ((TARGET_64BIT
 210        && *(pc + 0)  == 0x53db3f51              /* ldd -58(sp),dp */
 211        && *(pc + 8)  == 0x34160116              /* ldi 8b,r22 */
 212        && *(pc + 9)  == 0x08360ac1              /* shladd,l r22,3,r1,r1 */
 213        && *(pc + 10) == 0x0c2010c1              /* ldd 0(r1),r1 */
 214        && *(pc + 11) == 0xe4202000)             /* be,l 0(sr4,r1) */
 215       ||
 216       (TARGET_64BIT
 217        && *(pc + 0)  == 0x36dc0000              /* ldo 0(r22),ret0 */
 218        && *(pc + 6)  == 0x341601c0              /* ldi e0,r22 */
 219        && *(pc + 7)  == 0x08360ac1              /* shladd,l r22,3,r1,r1 */
 220        && *(pc + 8)  == 0x0c2010c1              /* ldd 0(r1),r1 */
 221        && *(pc + 9)  == 0xe4202000)             /* be,l 0(sr4,r1) */
 222       ||
 223       (!TARGET_64BIT
 224        && *(pc + 0)  == 0x379a0000              /* ldo 0(ret0),r26 */
 225        && *(pc + 1)  == 0x6bd33fc9              /* stw r19,-1c(sp) */
 226        && *(pc + 2)  == 0x20200801              /* ldil L%-40000000,r1 */
 227        && *(pc + 3)  == 0xe420e008              /* be,l 4(sr7,r1) */
 228        && *(pc + 4)  == 0x34160116)             /* ldi 8b,r22 */
 229       ||
 230       (!TARGET_64BIT
 231        && *(pc + 0)  == 0x6bd33fc9              /* stw r19,-1c(sp) */
 232        && *(pc + 1)  == 0x20200801              /* ldil L%-40000000,r1 */
 233        && *(pc + 2)  == 0xe420e008              /* be,l 4(sr7,r1) */
 234        && *(pc + 3)  == 0x341601c0))            /* ldi e0,r22 */
 235     {
 236       /* The previous stack pointer is saved at (long *)SP - 1.  The
 237          ucontext structure is offset from the start of the previous
 238          frame by the siglocal_misc structure.  */
 239       struct siglocalx *sl = (struct siglocalx *)
 240         (*((long *) context->cfa - 1));
 241       mcontext_t *mc = &(sl->sl_uc.uc_mcontext);
 242
 243       long new_cfa = GetSSReg (mc, ss_sp);
 244
 245       fs->regs.cfa_how = CFA_REG_OFFSET;
 246       fs->regs.cfa_reg = 30;
 247       fs->regs.cfa_offset = new_cfa - (long) context->cfa;
 248
 249       UPDATE_FS_FOR_GR (fs, 1, 1);
 250       UPDATE_FS_FOR_GR (fs, 2, 2);
 251       UPDATE_FS_FOR_GR (fs, 3, 3);
 252       UPDATE_FS_FOR_GR (fs, 4, 4);
 253       UPDATE_FS_FOR_GR (fs, 5, 5);
 254       UPDATE_FS_FOR_GR (fs, 6, 6);
 255       UPDATE_FS_FOR_GR (fs, 7, 7);
 256       UPDATE_FS_FOR_GR (fs, 8, 8);
 257       UPDATE_FS_FOR_GR (fs, 9, 9);
 258       UPDATE_FS_FOR_GR (fs, 10, 10);
 259       UPDATE_FS_FOR_GR (fs, 11, 11);
 260       UPDATE_FS_FOR_GR (fs, 12, 12);
 261       UPDATE_FS_FOR_GR (fs, 13, 13);
 262       UPDATE_FS_FOR_GR (fs, 14, 14);
 263       UPDATE_FS_FOR_GR (fs, 15, 15);
 264       UPDATE_FS_FOR_GR (fs, 16, 16);
 265       UPDATE_FS_FOR_GR (fs, 17, 17);
 266       UPDATE_FS_FOR_GR (fs, 18, 18);
 267       UPDATE_FS_FOR_GR (fs, 19, 19);
 268       UPDATE_FS_FOR_GR (fs, 20, 20);
 269       UPDATE_FS_FOR_GR (fs, 21, 21);
 270       UPDATE_FS_FOR_GR (fs, 22, 22);
 271       UPDATE_FS_FOR_GR (fs, 23, 23);
 272       UPDATE_FS_FOR_GR (fs, 24, 24);
 273       UPDATE_FS_FOR_GR (fs, 25, 25);
 274       UPDATE_FS_FOR_GR (fs, 26, 26);
 275       UPDATE_FS_FOR_GR (fs, 27, 27);
 276       UPDATE_FS_FOR_GR (fs, 28, 28);
 277       UPDATE_FS_FOR_GR (fs, 29, 29);
 278       UPDATE_FS_FOR_GR (fs, 30, 30);
 279       UPDATE_FS_FOR_GR (fs, 31, 31);
 280
 281       if (TARGET_64BIT)
 282         {
 283           UPDATE_FS_FOR_FR (fs, 4, 32);
 284           UPDATE_FS_FOR_FR (fs, 5, 33);
 285           UPDATE_FS_FOR_FR (fs, 6, 34);
 286           UPDATE_FS_FOR_FR (fs, 7, 35);
 287           UPDATE_FS_FOR_FR (fs, 8, 36);
 288           UPDATE_FS_FOR_FR (fs, 9, 37);
 289           UPDATE_FS_FOR_FR (fs, 10, 38);
 290           UPDATE_FS_FOR_FR (fs, 11, 39);
 291           UPDATE_FS_FOR_FR (fs, 12, 40);
 292           UPDATE_FS_FOR_FR (fs, 13, 41);
 293           UPDATE_FS_FOR_FR (fs, 14, 42);
 294           UPDATE_FS_FOR_FR (fs, 15, 43);
 295           UPDATE_FS_FOR_FR (fs, 16, 44);
 296           UPDATE_FS_FOR_FR (fs, 17, 45);
 297           UPDATE_FS_FOR_FR (fs, 18, 46);
 298           UPDATE_FS_FOR_FR (fs, 19, 47);
 299           UPDATE_FS_FOR_FR (fs, 20, 48);
 300           UPDATE_FS_FOR_FR (fs, 21, 49);
 301           UPDATE_FS_FOR_FR (fs, 22, 50);
 302           UPDATE_FS_FOR_FR (fs, 23, 51);
 303           UPDATE_FS_FOR_FR (fs, 24, 52);
 304           UPDATE_FS_FOR_FR (fs, 25, 53);
 305           UPDATE_FS_FOR_FR (fs, 26, 54);
 306           UPDATE_FS_FOR_FR (fs, 27, 55);
 307           UPDATE_FS_FOR_FR (fs, 28, 56);
 308           UPDATE_FS_FOR_FR (fs, 29, 57);
 309           UPDATE_FS_FOR_FR (fs, 30, 58);
 310           UPDATE_FS_FOR_FR (fs, 31, 59);
 311
 312           UPDATE_FS_FOR_SAR (fs, 60);
 313         }
 314       else
 315         {
 316           UPDATE_FS_FOR_FR (fs, 4, 32);
 317           UPDATE_FS_FOR_FR (fs, 5, 34);
 318           UPDATE_FS_FOR_FR (fs, 6, 36);
 319           UPDATE_FS_FOR_FR (fs, 7, 38);
 320           UPDATE_FS_FOR_FR (fs, 8, 40);
 321           UPDATE_FS_FOR_FR (fs, 9, 44);
 322           UPDATE_FS_FOR_FR (fs, 10, 44);
 323           UPDATE_FS_FOR_FR (fs, 11, 46);
 324           UPDATE_FS_FOR_FR (fs, 12, 48);
 325           UPDATE_FS_FOR_FR (fs, 13, 50);
 326           UPDATE_FS_FOR_FR (fs, 14, 52);
 327           UPDATE_FS_FOR_FR (fs, 15, 54);
 328
 329           if (!cpu)
 330             cpu = sysconf (_SC_CPU_VERSION);
 331
 332           /* PA-RISC 1.0 only has 16 floating point registers.  */
 333           if (cpu != CPU_PA_RISC1_0)
 334             {
 335               UPDATE_FS_FOR_FR (fs, 16, 56);
 336               UPDATE_FS_FOR_FR (fs, 17, 58);
 337               UPDATE_FS_FOR_FR (fs, 18, 60);
 338               UPDATE_FS_FOR_FR (fs, 19, 62);
 339               UPDATE_FS_FOR_FR (fs, 20, 64);
 340               UPDATE_FS_FOR_FR (fs, 21, 66);
 341               UPDATE_FS_FOR_FR (fs, 22, 68);
 342               UPDATE_FS_FOR_FR (fs, 23, 70);
 343               UPDATE_FS_FOR_FR (fs, 24, 72);
 344               UPDATE_FS_FOR_FR (fs, 25, 74);
 345               UPDATE_FS_FOR_FR (fs, 26, 76);
 346               UPDATE_FS_FOR_FR (fs, 27, 78);
 347               UPDATE_FS_FOR_FR (fs, 28, 80);
 348               UPDATE_FS_FOR_FR (fs, 29, 82);
 349               UPDATE_FS_FOR_FR (fs, 30, 84);
 350               UPDATE_FS_FOR_FR (fs, 31, 86);
 351             }
 352
 353           UPDATE_FS_FOR_SAR (fs, 88);
 354         }
 355
 356       fs->retaddr_column = DWARF_ALT_FRAME_RETURN_COLUMN;
 357       UPDATE_FS_FOR_PC (fs, DWARF_ALT_FRAME_RETURN_COLUMN);
 358       fs->signal_frame = 1;
 359
 360       return _URC_NO_REASON;
 361     }
 362
 363   return _URC_END_OF_STACK;
 364 }
 365 #endif /* inhibit_libc */