gcc/frame.h

   1 /* Header file for unwinding stack frames for exception handling.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
   4    Contributed by Jason Merrill <jason@cygnus.com>.
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU CC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23
  24 #ifndef DWARF_FRAME_REGISTERS
  25 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
  26 #endif
  27
  28 typedef struct frame_state
  29 {
  30   void *cfa;
  31   void *eh_ptr;
  32   long cfa_offset;
  33   long args_size;
  34   long reg_or_offset[DWARF_FRAME_REGISTERS+1];
  35   unsigned short cfa_reg;
  36   unsigned short retaddr_column;
  37   char saved[DWARF_FRAME_REGISTERS+1];
  38 } frame_state;
  39
  40 /* Values for 'saved' above.  */
  41 #define REG_UNSAVED 0
  42 #define REG_SAVED_OFFSET 1
  43 #define REG_SAVED_REG 2
  44
  45 /* The representation for an "object" to be searched for frame unwind info.
  46    For targets with named sections, one object is an executable or shared
  47    library; for other targets, one object is one translation unit.
  48
  49    A copy of this structure declaration is printed by collect2.c;
  50    keep the copies synchronized!  */
  51
  52 struct object {
  53 #ifdef IA64_UNWIND_INFO
  54   void *pc_base;        /* This field will be set by find_fde. */
  55 #endif
  56   void *pc_begin;
  57   void *pc_end;
  58   struct dwarf_fde *fde_begin;
  59 #ifdef IA64_UNWIND_INFO
  60   struct dwarf_fde *fde_end;
  61 #endif
  62   struct dwarf_fde **fde_array;
  63   size_t count;
  64   struct object *next;
  65 };
  66
  67 /* Note the following routines are exported interfaces from libgcc; do not
  68    change these interfaces.  Instead create new interfaces.  Also note
  69    references to these functions may be made weak in files where they
  70    are referenced.  */
  71
  72 extern void __register_frame (void * );
  73 extern void __register_frame_table (void *);
  74 extern void __deregister_frame (void *);
  75
  76 /* Called either from crtbegin.o or a static constructor to register the
  77    unwind info for an object or translation unit, respectively.  */
  78
  79 extern void __register_frame_info (void *, struct object *);
  80
  81 /* Similar, but BEGIN is actually a pointer to a table of unwind entries
  82    for different translation units.  Called from the file generated by
  83    collect2.  */
  84 extern void __register_frame_info_table (void *, struct object *);
  85
  86 /* Called from crtend.o to deregister the unwind info for an object.  */
  87
  88 extern void *__deregister_frame_info (void *);
  89
  90 /* Called from __throw to find the registers to restore for a given
  91    PC_TARGET.  The caller should allocate a local variable of `struct
  92    frame_state' (declared in frame.h) and pass its address to STATE_IN.
  93    Returns NULL on failure, otherwise returns STATE_IN.  */
  94
  95 extern struct frame_state *__frame_state_for (void *, struct frame_state *);
  96
  97 #ifdef IA64_UNWIND_INFO
  98
  99 /* This is the information required for unwind records in an ia64
 100    object file. This is required by GAS and the compiler runtime. */
 101
 102 /* These are the starting point masks for the various types of
 103    unwind records. To create a record of type R3 for instance, one
 104    starts by using the value UNW_R3 and or-ing in any other required values.
 105    These values are also unique (in context), so they can be used to identify
 106    the various record types as well. UNW_Bx and some UNW_Px do have the
 107    same value, but Px can only occur in a prologue context, and Bx in
 108    a body context.  */
 109
 110 #define UNW_R1  0x00
 111 #define UNW_R2  0x40
 112 #define UNW_R3  0x60
 113 #define UNW_P1  0x80
 114 #define UNW_P2  0xA0
 115 #define UNW_P3  0xB0
 116 #define UNW_P4  0xB8
 117 #define UNW_P5  0xB9
 118 #define UNW_P6  0xC0
 119 #define UNW_P7  0xE0
 120 #define UNW_P8  0xF0
 121 #define UNW_P9  0xF1
 122 #define UNW_P10 0xFF
 123 #define UNW_X1  0xF9
 124 #define UNW_X2  0xFA
 125 #define UNW_X3  0xFB
 126 #define UNW_X4  0xFC
 127 #define UNW_B1  0x80
 128 #define UNW_B2  0xC0
 129 #define UNW_B3  0xE0
 130 #define UNW_B4  0xF0
 131
 132 /* These are all the various types of unwind records.  */
 133
 134 typedef enum
 135 {
 136   prologue, prologue_gr, body, mem_stack_f, mem_stack_v, psp_gr, psp_sprel,
 137   rp_when, rp_gr, rp_br, rp_psprel, rp_sprel, pfs_when, pfs_gr, pfs_psprel,
 138   pfs_sprel, preds_when, preds_gr, preds_psprel, preds_sprel,
 139   fr_mem, frgr_mem, gr_gr, gr_mem, br_mem, br_gr, spill_base, spill_mask,
 140   unat_when, unat_gr, unat_psprel, unat_sprel, lc_when, lc_gr, lc_psprel,
 141   lc_sprel, fpsr_when, fpsr_gr, fpsr_psprel, fpsr_sprel,
 142   priunat_when_gr, priunat_when_mem, priunat_gr, priunat_psprel,
 143   priunat_sprel, bsp_when, bsp_gr, bsp_psprel, bsp_sprel, bspstore_when,
 144   bspstore_gr, bspstore_psprel, bspstore_sprel, rnat_when, rnat_gr,
 145   rnat_psprel, rnat_sprel, epilogue, label_state, copy_state,
 146   spill_psprel, spill_sprel, spill_reg, spill_psprel_p, spill_sprel_p,
 147   spill_reg_p
 148 } unw_record_type;
 149
 150
 151 /* These structures declare the fields that can be used in each of the
 152    4 record formats, R, P, B and X.  */
 153
 154 typedef struct unw_r_record
 155 {
 156   unsigned long rlen;
 157   unsigned short mask;
 158   unsigned short grsave;
 159 } unw_r_record;
 160
 161 typedef struct unw_p_record
 162 {
 163   void *imask;
 164   unsigned long t;
 165   unsigned long size;
 166   unsigned long spoff;
 167   unsigned long br;
 168   unsigned long pspoff;
 169   unsigned short gr;
 170   unsigned short rmask;
 171   unsigned short grmask;
 172   unsigned long frmask;
 173   unsigned short brmask;
 174 } unw_p_record;
 175
 176 typedef struct unw_b_record
 177 {
 178   unsigned long t;
 179   unsigned long label;
 180   unsigned short ecount;
 181 } unw_b_record;
 182
 183 typedef struct unw_x_record
 184 {
 185   unsigned long t;
 186   unsigned long spoff;
 187   unsigned long pspoff;
 188   unsigned short reg;
 189   unsigned short treg;
 190   unsigned short qp;
 191   unsigned short xy;   /* Value of the XY field..  */
 192 } unw_x_record;
 193
 194 /* This structure is used to determine the specific record type and
 195    its fields.  */
 196 typedef struct unwind_record
 197 {
 198   unw_record_type type;
 199   union {
 200     unw_r_record r;
 201     unw_p_record p;
 202     unw_b_record b;
 203     unw_x_record x;
 204   } record;
 205 } unwind_record;
 206
 207 #define IA64_UNW_LOC_TYPE_NONE          0
 208 #define IA64_UNW_LOC_TYPE_MEM           1
 209 #define IA64_UNW_LOC_TYPE_GR            2
 210 #define IA64_UNW_LOC_TYPE_FR            3
 211 #define IA64_UNW_LOC_TYPE_BR            4
 212 #define IA64_UNW_LOC_TYPE_SPOFF         5
 213 #define IA64_UNW_LOC_TYPE_PSPOFF        6
 214 #define IA64_UNW_LOC_TYPE_OFFSET        7
 215 #define IA64_UNW_LOC_TYPE_SPILLBASE     8
 216
 217 typedef struct ia64_reg_loc
 218 {
 219   long when;            /* PC relative offset from start of function. */
 220   union {               /* In memory or another register?  */
 221     void *mem;
 222     int regno;
 223     int offset;
 224   } l;
 225   short loc_type;       /* Where to find value.  */
 226   short reg_size;
 227 } ia64_reg_loc;
 228
 229 /* Frame information record.  */
 230
 231 typedef struct ia64_frame_state
 232 {
 233   ia64_reg_loc gr[4];   /* gr4 to  gr7.  */
 234   ia64_reg_loc fr[20];  /* fr2 to fr5, fr16 to fr31.  */
 235   ia64_reg_loc br[5];   /* br1 to  br5.  */
 236   ia64_reg_loc rp;
 237   ia64_reg_loc fpsr;
 238   ia64_reg_loc bsp;
 239   ia64_reg_loc bspstore;
 240   ia64_reg_loc rnat;
 241   ia64_reg_loc pfs;
 242   ia64_reg_loc unat;
 243   ia64_reg_loc lc;
 244   ia64_reg_loc pr;
 245   ia64_reg_loc priunat;
 246   ia64_reg_loc sp;
 247   ia64_reg_loc psp;
 248   ia64_reg_loc spill_base;
 249   void *my_sp;
 250   void *my_bsp;
 251 } ia64_frame_state;
 252
 253 /* This structure represents the start of an unwind information pointer.
 254    'unwind_descriptors' is the beginninng of the unwind descriptors, which
 255    use up 'length' bytes of storage.  */
 256
 257 typedef struct unwind_info_ptr
 258 {
 259   unsigned long header; /* version, flags, & length */
 260   unsigned char unwind_descriptors[1];
 261 } unwind_info_ptr;
 262
 263 #define IA64_UNW_HDR_LENGTH(x)  ((x) & 0x00000000ffffffffUL)
 264 #define IA64_UNW_HDR_FLAGS(x)   (((x) >> 32) & 0xffffUL)
 265 #define IA64_UNW_HDR_VERSION(x) (((x) >> 48) & 0xffffUL)
 266
 267 extern unwind_info_ptr *__build_ia64_frame_state (unsigned char *,
 268                                                   ia64_frame_state *, void *,
 269                                                   void **);
 270 extern void *__get_real_reg_value (ia64_reg_loc *);
 271 extern void *__get_personality (unwind_info_ptr *);
 272 extern void *__get_except_table (unwind_info_ptr *);
 273 extern void __set_real_reg_value (ia64_reg_loc *, void *);
 274 void *__calc_caller_bsp (long, unsigned char *);
 275 void __copy_saved_reg_state (ia64_frame_state *, ia64_frame_state *);
 276 #endif   /* IA64_UNWIND_INFO  */
 277