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_SAR_REGNUM = 32,         /* Shift Amount Register */
  43   HPPA_IPSW_REGNUM = 41,        /* Interrupt Processor Status Word */
  44   HPPA_PCOQ_HEAD_REGNUM = 33,   /* instruction offset queue head */
  45   HPPA_PCSQ_HEAD_REGNUM = 34,   /* instruction space queue head */
  46   HPPA_PCOQ_TAIL_REGNUM = 35,   /* instruction offset queue tail */
  47   HPPA_PCSQ_TAIL_REGNUM = 36,   /* instruction space queue tail */
  48   HPPA_EIEM_REGNUM = 37,        /* External Interrupt Enable Mask */
  49   HPPA_IIR_REGNUM = 38,         /* Interrupt Instruction Register */
  50   HPPA_ISR_REGNUM = 39,         /* Interrupt Space Register */
  51   HPPA_IOR_REGNUM = 40,         /* Interrupt Offset Register */
  52   HPPA_SR4_REGNUM = 43,         /* space register 4 */
  53   HPPA_RCR_REGNUM = 51,         /* Recover Counter (also known as cr0) */
  54   HPPA_PID0_REGNUM = 52,        /* Protection ID */
  55   HPPA_PID1_REGNUM = 53,        /* Protection ID */
  56   HPPA_PID2_REGNUM = 55,        /* Protection ID */
  57   HPPA_PID3_REGNUM = 56,        /* Protection ID */
  58   HPPA_CCR_REGNUM = 54,         /* Coprocessor Configuration Register */
  59   HPPA_TR0_REGNUM = 57,         /* Temporary Registers (cr24 -> cr31) */
  60   HPPA_CR27_REGNUM = 60,        /* Base register for thread-local storage, cr27 */
  61   HPPA_FP0_REGNUM = 64,         /* First floating-point.  */
  62   HPPA_FP4_REGNUM = 72,
  63
  64   HPPA_ARG0_REGNUM = 26,        /* The first argument of a callee. */
  65   HPPA_ARG1_REGNUM = 25,        /* The second argument of a callee. */
  66   HPPA_ARG2_REGNUM = 24,        /* The third argument of a callee. */
  67   HPPA_ARG3_REGNUM = 23         /* The fourth argument of a callee. */
  68 };
  69
  70 /* Target-dependent structure in gdbarch.  */
  71 struct gdbarch_tdep
  72 {
  73   /* The number of bytes in an address.  For now, this field is designed
  74      to allow us to differentiate hppa32 from hppa64 targets.  */
  75   int bytes_per_address;
  76
  77   /* Is this an ELF target? This can be 64-bit HP-UX, or a 32/64-bit GNU/Linux
  78      system.  */
  79   int is_elf;
  80 };
  81
  82 /*
  83  * Unwind table and descriptor.
  84  */
  85
  86 struct unwind_table_entry
  87   {
  88     CORE_ADDR region_start;
  89     CORE_ADDR region_end;
  90
  91     unsigned int Cannot_unwind:1;       /* 0 */
  92     unsigned int Millicode:1;   /* 1 */
  93     unsigned int Millicode_save_sr0:1;  /* 2 */
  94     unsigned int Region_description:2;  /* 3..4 */
  95     unsigned int reserved1:1;   /* 5 */
  96     unsigned int Entry_SR:1;    /* 6 */
  97     unsigned int Entry_FR:4;    /* number saved *//* 7..10 */
  98     unsigned int Entry_GR:5;    /* number saved *//* 11..15 */
  99     unsigned int Args_stored:1; /* 16 */
 100     unsigned int Variable_Frame:1;      /* 17 */
 101     unsigned int Separate_Package_Body:1;       /* 18 */
 102     unsigned int Frame_Extension_Millicode:1;   /* 19 */
 103     unsigned int Stack_Overflow_Check:1;        /* 20 */
 104     unsigned int Two_Instruction_SP_Increment:1;        /* 21 */
 105     unsigned int Ada_Region:1;  /* 22 */
 106     unsigned int cxx_info:1;    /* 23 */
 107     unsigned int cxx_try_catch:1;       /* 24 */
 108     unsigned int sched_entry_seq:1;     /* 25 */
 109     unsigned int reserved2:1;   /* 26 */
 110     unsigned int Save_SP:1;     /* 27 */
 111     unsigned int Save_RP:1;     /* 28 */
 112     unsigned int Save_MRP_in_frame:1;   /* 29 */
 113     unsigned int extn_ptr_defined:1;    /* 30 */
 114     unsigned int Cleanup_defined:1;     /* 31 */
 115
 116     unsigned int MPE_XL_interrupt_marker:1;     /* 0 */
 117     unsigned int HP_UX_interrupt_marker:1;      /* 1 */
 118     unsigned int Large_frame:1; /* 2 */
 119     unsigned int Pseudo_SP_Set:1;       /* 3 */
 120     unsigned int reserved4:1;   /* 4 */
 121     unsigned int Total_frame_size:27;   /* 5..31 */
 122
 123     /* This is *NOT* part of an actual unwind_descriptor in an object
 124        file.  It is *ONLY* part of the "internalized" descriptors that
 125        we create from those in a file.
 126      */
 127     struct
 128       {
 129         unsigned int stub_type:4;       /* 0..3 */
 130         unsigned int padding:28;        /* 4..31 */
 131       }
 132     stub_unwind;
 133   };
 134
 135 /* HP linkers also generate unwinds for various linker-generated stubs.
 136    GDB reads in the stubs from the $UNWIND_END$ subspace, then
 137    "converts" them into normal unwind entries using some of the reserved
 138    fields to store the stub type.  */
 139
 140 /* The gaps represent linker stubs used in MPE and space for future
 141    expansion.  */
 142 enum unwind_stub_types
 143   {
 144     LONG_BRANCH = 1,
 145     PARAMETER_RELOCATION = 2,
 146     EXPORT = 10,
 147     IMPORT = 11,
 148     IMPORT_SHLIB = 12,
 149   };
 150
 151 struct unwind_table_entry *find_unwind_entry (CORE_ADDR);
 152
 153 /* We use the objfile->obj_private pointer for two things:
 154  * 1.  An unwind table;
 155  *
 156  * 2.  A pointer to any associated shared library object.
 157  *
 158  * #defines are used to help refer to these objects.
 159  */
 160
 161 /* Info about the unwind table associated with an object file.
 162  * This is hung off of the "objfile->obj_private" pointer, and
 163  * is allocated in the objfile's psymbol obstack.  This allows
 164  * us to have unique unwind info for each executable and shared
 165  * library that we are debugging.
 166  */
 167 struct hppa_unwind_info
 168   {
 169     struct unwind_table_entry *table;   /* Pointer to unwind info */
 170     struct unwind_table_entry *cache;   /* Pointer to last entry we found */
 171     int last;                   /* Index of last entry */
 172   };
 173
 174 struct hppa_objfile_private
 175   {
 176     struct hppa_unwind_info *unwind_info;       /* a pointer */
 177     struct so_list *so_info;    /* a pointer  */
 178     CORE_ADDR dp;
 179   };
 180
 181 extern const struct objfile_data *hppa_objfile_priv_data;
 182
 183 int hppa_get_field (unsigned word, int from, int to);
 184 int hppa_extract_5_load (unsigned int);
 185 unsigned hppa_extract_5R_store (unsigned int);
 186 unsigned hppa_extract_5r_store (unsigned int);
 187 int hppa_extract_17 (unsigned int);
 188 int hppa_extract_21 (unsigned);
 189 int hppa_extract_14 (unsigned);
 190 int hppa_low_sign_extend (unsigned int, unsigned int);
 191 int hppa_sign_extend (unsigned int, unsigned int);
 192
 193 void
 194 hppa_frame_prev_register_helper (struct frame_info *next_frame,
 195                                  struct trad_frame_saved_reg *saved_regs,
 196                                  int regnum, int *optimizedp,
 197                                  enum lval_type *lvalp, CORE_ADDR *addrp,
 198                                  int *realnump, void *valuep);
 199
 200 #endif  /* HPPA_TDEP_H */