gdb/hppa-tdep.h

   1 /* Common target dependent code for GDB on HPPA systems.
   2    Copyright 2003, 2004 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program 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 of the License, or
   9    (at your option) any later version.
  10
  11    This program 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    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef HPPA_TDEP_H
  22 #define HPPA_TDEP_H
  23
  24 struct trad_frame_saved_reg;
  25
  26 /* Register numbers of various important registers.
  27    Note that some of these values are "real" register numbers,
  28    and correspond to the general registers of the machine,
  29    and some are "phony" register numbers which are too large
  30    to be actual register numbers as far as the user is concerned
  31    but do serve to get the desired values when passed to read_register.  */
  32
  33 enum hppa_regnum
  34 {
  35   HPPA_R0_REGNUM = 0,           /* Doesn't actually exist, used as base for
  36                                    other r registers.  */
  37   HPPA_R1_REGNUM = 1,
  38   HPPA_FLAGS_REGNUM = 0,        /* Various status flags */
  39   HPPA_RP_REGNUM = 2,           /* return pointer */
  40   HPPA_FP_REGNUM = 3,           /* The ABI's frame pointer, when used */
  41   HPPA_SP_REGNUM = 30,          /* Stack pointer.  */
  42   HPPA_R31_REGNUM = 31,
  43   HPPA_SAR_REGNUM = 32,         /* Shift Amount Register */
  44   HPPA_IPSW_REGNUM = 41,        /* Interrupt Processor Status Word */
  45   HPPA_PCOQ_HEAD_REGNUM = 33,   /* instruction offset queue head */
  46   HPPA_PCSQ_HEAD_REGNUM = 34,   /* instruction space queue head */
  47   HPPA_PCOQ_TAIL_REGNUM = 35,   /* instruction offset queue tail */
  48   HPPA_PCSQ_TAIL_REGNUM = 36,   /* instruction space queue tail */
  49   HPPA_EIEM_REGNUM = 37,        /* External Interrupt Enable Mask */
  50   HPPA_IIR_REGNUM = 38,         /* Interrupt Instruction Register */
  51   HPPA_ISR_REGNUM = 39,         /* Interrupt Space Register */
  52   HPPA_IOR_REGNUM = 40,         /* Interrupt Offset Register */
  53   HPPA_SR4_REGNUM = 43,         /* space register 4 */
  54   HPPA_RCR_REGNUM = 51,         /* Recover Counter (also known as cr0) */
  55   HPPA_PID0_REGNUM = 52,        /* Protection ID */
  56   HPPA_PID1_REGNUM = 53,        /* Protection ID */
  57   HPPA_PID2_REGNUM = 55,        /* Protection ID */
  58   HPPA_PID3_REGNUM = 56,        /* Protection ID */
  59   HPPA_CCR_REGNUM = 54,         /* Coprocessor Configuration Register */
  60   HPPA_TR0_REGNUM = 57,         /* Temporary Registers (cr24 -> cr31) */
  61   HPPA_CR27_REGNUM = 60,        /* Base register for thread-local storage, cr27 */
  62   HPPA_FP0_REGNUM = 64,         /* First floating-point.  */
  63   HPPA_FP4_REGNUM = 72,
  64
  65   HPPA_ARG0_REGNUM = 26,        /* The first argument of a callee. */
  66   HPPA_ARG1_REGNUM = 25,        /* The second argument of a callee. */
  67   HPPA_ARG2_REGNUM = 24,        /* The third argument of a callee. */
  68   HPPA_ARG3_REGNUM = 23         /* The fourth argument of a callee. */
  69 };
  70
  71 /* Target-dependent structure in gdbarch.  */
  72 struct gdbarch_tdep
  73 {
  74   /* The number of bytes in an address.  For now, this field is designed
  75      to allow us to differentiate hppa32 from hppa64 targets.  */
  76   int bytes_per_address;
  77
  78   /* Is this an ELF target? This can be 64-bit HP-UX, or a 32/64-bit GNU/Linux
  79      system.  */
  80   int is_elf;
  81
  82   /* Given a function address, try to find the global pointer for the
  83      corresponding shared object.  */
  84   CORE_ADDR (*find_global_pointer) (struct value *);
  85
  86   /* For shared libraries, each call goes through a small piece of
  87      trampoline code in the ".plt", or equivalent, section.
  88      IN_SOLIB_CALL_TRAMPOLINE evaluates to nonzero if we are currently
  89      stopped in one of these.  */
  90   int (*in_solib_call_trampoline) (CORE_ADDR pc, char *name);
  91 };
  92
  93 /*
  94  * Unwind table and descriptor.
  95  */
  96
  97 struct unwind_table_entry
  98   {
  99     CORE_ADDR region_start;
 100     CORE_ADDR region_end;
 101
 102     unsigned int Cannot_unwind:1;       /* 0 */
 103     unsigned int Millicode:1;   /* 1 */
 104     unsigned int Millicode_save_sr0:1;  /* 2 */
 105     unsigned int Region_description:2;  /* 3..4 */
 106     unsigned int reserved1:1;   /* 5 */
 107     unsigned int Entry_SR:1;    /* 6 */
 108     unsigned int Entry_FR:4;    /* number saved *//* 7..10 */
 109     unsigned int Entry_GR:5;    /* number saved *//* 11..15 */
 110     unsigned int Args_stored:1; /* 16 */
 111     unsigned int Variable_Frame:1;      /* 17 */
 112     unsigned int Separate_Package_Body:1;       /* 18 */
 113     unsigned int Frame_Extension_Millicode:1;   /* 19 */
 114     unsigned int Stack_Overflow_Check:1;        /* 20 */
 115     unsigned int Two_Instruction_SP_Increment:1;        /* 21 */
 116     unsigned int Ada_Region:1;  /* 22 */
 117     unsigned int cxx_info:1;    /* 23 */
 118     unsigned int cxx_try_catch:1;       /* 24 */
 119     unsigned int sched_entry_seq:1;     /* 25 */
 120     unsigned int reserved2:1;   /* 26 */
 121     unsigned int Save_SP:1;     /* 27 */
 122     unsigned int Save_RP:1;     /* 28 */
 123     unsigned int Save_MRP_in_frame:1;   /* 29 */
 124     unsigned int extn_ptr_defined:1;    /* 30 */
 125     unsigned int Cleanup_defined:1;     /* 31 */
 126
 127     unsigned int MPE_XL_interrupt_marker:1;     /* 0 */
 128     unsigned int HP_UX_interrupt_marker:1;      /* 1 */
 129     unsigned int Large_frame:1; /* 2 */
 130     unsigned int Pseudo_SP_Set:1;       /* 3 */
 131     unsigned int reserved4:1;   /* 4 */
 132     unsigned int Total_frame_size:27;   /* 5..31 */
 133
 134     /* This is *NOT* part of an actual unwind_descriptor in an object
 135        file.  It is *ONLY* part of the "internalized" descriptors that
 136        we create from those in a file.
 137      */
 138     struct
 139       {
 140         unsigned int stub_type:4;       /* 0..3 */
 141         unsigned int padding:28;        /* 4..31 */
 142       }
 143     stub_unwind;
 144   };
 145
 146 /* HP linkers also generate unwinds for various linker-generated stubs.
 147    GDB reads in the stubs from the $UNWIND_END$ subspace, then
 148    "converts" them into normal unwind entries using some of the reserved
 149    fields to store the stub type.  */
 150
 151 /* The gaps represent linker stubs used in MPE and space for future
 152    expansion.  */
 153 enum unwind_stub_types
 154   {
 155     LONG_BRANCH = 1,
 156     PARAMETER_RELOCATION = 2,
 157     EXPORT = 10,
 158     IMPORT = 11,
 159     IMPORT_SHLIB = 12,
 160   };
 161
 162 struct unwind_table_entry *find_unwind_entry (CORE_ADDR);
 163
 164 /* We use the objfile->obj_private pointer for two things:
 165  * 1.  An unwind table;
 166  *
 167  * 2.  A pointer to any associated shared library object.
 168  *
 169  * #defines are used to help refer to these objects.
 170  */
 171
 172 /* Info about the unwind table associated with an object file.
 173  * This is hung off of the "objfile->obj_private" pointer, and
 174  * is allocated in the objfile's psymbol obstack.  This allows
 175  * us to have unique unwind info for each executable and shared
 176  * library that we are debugging.
 177  */
 178 struct hppa_unwind_info
 179   {
 180     struct unwind_table_entry *table;   /* Pointer to unwind info */
 181     struct unwind_table_entry *cache;   /* Pointer to last entry we found */
 182     int last;                   /* Index of last entry */
 183   };
 184
 185 struct hppa_objfile_private
 186   {
 187     struct hppa_unwind_info *unwind_info;       /* a pointer */
 188     struct so_list *so_info;    /* a pointer  */
 189     CORE_ADDR dp;
 190   };
 191
 192 extern const struct objfile_data *hppa_objfile_priv_data;
 193
 194 int hppa_get_field (unsigned word, int from, int to);
 195 int hppa_extract_5_load (unsigned int);
 196 unsigned hppa_extract_5R_store (unsigned int);
 197 unsigned hppa_extract_5r_store (unsigned int);
 198 int hppa_extract_17 (unsigned int);
 199 int hppa_extract_21 (unsigned);
 200 int hppa_extract_14 (unsigned);
 201 int hppa_low_sign_extend (unsigned int, unsigned int);
 202 int hppa_sign_extend (unsigned int, unsigned int);
 203 CORE_ADDR hppa_symbol_address(const char *sym);
 204
 205 void
 206 hppa_frame_prev_register_helper (struct frame_info *next_frame,
 207                                  struct trad_frame_saved_reg *saved_regs,
 208                                  int regnum, int *optimizedp,
 209                                  enum lval_type *lvalp, CORE_ADDR *addrp,
 210                                  int *realnump, void *valuep);
 211
 212 #endif  /* HPPA_TDEP_H */