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 struct objfile;
  26 struct so_list;
  27
  28 /* Register numbers of various important registers.
  29    Note that some of these values are "real" register numbers,
  30    and correspond to the general registers of the machine,
  31    and some are "phony" register numbers which are too large
  32    to be actual register numbers as far as the user is concerned
  33    but do serve to get the desired values when passed to read_register.  */
  34
  35 enum hppa_regnum
  36 {
  37   HPPA_R0_REGNUM = 0,           /* Doesn't actually exist, used as base for
  38                                    other r registers.  */
  39   HPPA_R1_REGNUM = 1,
  40   HPPA_FLAGS_REGNUM = 0,        /* Various status flags */
  41   HPPA_RP_REGNUM = 2,           /* return pointer */
  42   HPPA_FP_REGNUM = 3,           /* The ABI's frame pointer, when used */
  43   HPPA_DP_REGNUM = 27,
  44   HPPA_RET0_REGNUM = 28,
  45   HPPA_RET1_REGNUM = 29,
  46   HPPA_SP_REGNUM = 30,          /* Stack pointer.  */
  47   HPPA_R31_REGNUM = 31,
  48   HPPA_SAR_REGNUM = 32,         /* Shift Amount Register */
  49   HPPA_IPSW_REGNUM = 41,        /* Interrupt Processor Status Word */
  50   HPPA_PCOQ_HEAD_REGNUM = 33,   /* instruction offset queue head */
  51   HPPA_PCSQ_HEAD_REGNUM = 34,   /* instruction space queue head */
  52   HPPA_PCOQ_TAIL_REGNUM = 35,   /* instruction offset queue tail */
  53   HPPA_PCSQ_TAIL_REGNUM = 36,   /* instruction space queue tail */
  54   HPPA_EIEM_REGNUM = 37,        /* External Interrupt Enable Mask */
  55   HPPA_IIR_REGNUM = 38,         /* Interrupt Instruction Register */
  56   HPPA_ISR_REGNUM = 39,         /* Interrupt Space Register */
  57   HPPA_IOR_REGNUM = 40,         /* Interrupt Offset Register */
  58   HPPA_SR4_REGNUM = 43,         /* space register 4 */
  59   HPPA_RCR_REGNUM = 51,         /* Recover Counter (also known as cr0) */
  60   HPPA_PID0_REGNUM = 52,        /* Protection ID */
  61   HPPA_PID1_REGNUM = 53,        /* Protection ID */
  62   HPPA_PID2_REGNUM = 55,        /* Protection ID */
  63   HPPA_PID3_REGNUM = 56,        /* Protection ID */
  64   HPPA_CCR_REGNUM = 54,         /* Coprocessor Configuration Register */
  65   HPPA_TR0_REGNUM = 57,         /* Temporary Registers (cr24 -> cr31) */
  66   HPPA_CR27_REGNUM = 60,        /* Base register for thread-local storage, cr27 */
  67   HPPA_FP0_REGNUM = 64,         /* First floating-point.  */
  68   HPPA_FP4_REGNUM = 72,
  69   HPPA64_FP4_REGNUM = 68,
  70
  71   HPPA_ARG0_REGNUM = 26,        /* The first argument of a callee. */
  72   HPPA_ARG1_REGNUM = 25,        /* The second argument of a callee. */
  73   HPPA_ARG2_REGNUM = 24,        /* The third argument of a callee. */
  74   HPPA_ARG3_REGNUM = 23         /* The fourth argument of a callee. */
  75 };
  76
  77 /* Target-dependent structure in gdbarch.  */
  78 struct gdbarch_tdep
  79 {
  80   /* The number of bytes in an address.  For now, this field is designed
  81      to allow us to differentiate hppa32 from hppa64 targets.  */
  82   int bytes_per_address;
  83
  84   /* Is this an ELF target? This can be 64-bit HP-UX, or a 32/64-bit GNU/Linux
  85      system.  */
  86   int is_elf;
  87
  88   /* Given a function address, try to find the global pointer for the
  89      corresponding shared object.  */
  90   CORE_ADDR (*find_global_pointer) (struct value *);
  91
  92   /* For shared libraries, each call goes through a small piece of
  93      trampoline code in the ".plt", or equivalent, section.
  94      IN_SOLIB_CALL_TRAMPOLINE evaluates to nonzero if we are currently
  95      stopped in one of these.  */
  96   int (*in_solib_call_trampoline) (CORE_ADDR pc, char *name);
  97
  98   /* For targets that support multiple spaces, we may have additional stubs
  99      in the return path.  These stubs are internal to the ABI, and users are
 100      not interested in them.  If we detect that we are returning to a stub,
 101      adjust the pc to the real caller.  This improves the behavior of commands
 102      that traverse frames such as "up" and "finish".  */
 103   void (*unwind_adjust_stub) (struct frame_info *next_frame, CORE_ADDR base,
 104                               struct trad_frame_saved_reg *saved_regs);
 105
 106   /* These are solib-dependent methods.  They are really HPUX only, but
 107      we don't have a HPUX-specific tdep vector at the moment.  */
 108   CORE_ADDR (*solib_thread_start_addr) (struct so_list *so);
 109   CORE_ADDR (*solib_get_got_by_pc) (CORE_ADDR addr);
 110   CORE_ADDR (*solib_get_solib_by_pc) (CORE_ADDR addr);
 111   CORE_ADDR (*solib_get_text_base) (struct objfile *objfile);
 112 };
 113
 114 /*
 115  * Unwind table and descriptor.
 116  */
 117
 118 struct unwind_table_entry
 119   {
 120     CORE_ADDR region_start;
 121     CORE_ADDR region_end;
 122
 123     unsigned int Cannot_unwind:1;       /* 0 */
 124     unsigned int Millicode:1;   /* 1 */
 125     unsigned int Millicode_save_sr0:1;  /* 2 */
 126     unsigned int Region_description:2;  /* 3..4 */
 127     unsigned int reserved1:1;   /* 5 */
 128     unsigned int Entry_SR:1;    /* 6 */
 129     unsigned int Entry_FR:4;    /* number saved *//* 7..10 */
 130     unsigned int Entry_GR:5;    /* number saved *//* 11..15 */
 131     unsigned int Args_stored:1; /* 16 */
 132     unsigned int Variable_Frame:1;      /* 17 */
 133     unsigned int Separate_Package_Body:1;       /* 18 */
 134     unsigned int Frame_Extension_Millicode:1;   /* 19 */
 135     unsigned int Stack_Overflow_Check:1;        /* 20 */
 136     unsigned int Two_Instruction_SP_Increment:1;        /* 21 */
 137     unsigned int Ada_Region:1;  /* 22 */
 138     unsigned int cxx_info:1;    /* 23 */
 139     unsigned int cxx_try_catch:1;       /* 24 */
 140     unsigned int sched_entry_seq:1;     /* 25 */
 141     unsigned int reserved2:1;   /* 26 */
 142     unsigned int Save_SP:1;     /* 27 */
 143     unsigned int Save_RP:1;     /* 28 */
 144     unsigned int Save_MRP_in_frame:1;   /* 29 */
 145     unsigned int extn_ptr_defined:1;    /* 30 */
 146     unsigned int Cleanup_defined:1;     /* 31 */
 147
 148     unsigned int MPE_XL_interrupt_marker:1;     /* 0 */
 149     unsigned int HP_UX_interrupt_marker:1;      /* 1 */
 150     unsigned int Large_frame:1; /* 2 */
 151     unsigned int Pseudo_SP_Set:1;       /* 3 */
 152     unsigned int reserved4:1;   /* 4 */
 153     unsigned int Total_frame_size:27;   /* 5..31 */
 154
 155     /* This is *NOT* part of an actual unwind_descriptor in an object
 156        file.  It is *ONLY* part of the "internalized" descriptors that
 157        we create from those in a file.
 158      */
 159     struct
 160       {
 161         unsigned int stub_type:4;       /* 0..3 */
 162         unsigned int padding:28;        /* 4..31 */
 163       }
 164     stub_unwind;
 165   };
 166
 167 /* HP linkers also generate unwinds for various linker-generated stubs.
 168    GDB reads in the stubs from the $UNWIND_END$ subspace, then
 169    "converts" them into normal unwind entries using some of the reserved
 170    fields to store the stub type.  */
 171
 172 /* The gaps represent linker stubs used in MPE and space for future
 173    expansion.  */
 174 enum unwind_stub_types
 175   {
 176     LONG_BRANCH = 1,
 177     PARAMETER_RELOCATION = 2,
 178     EXPORT = 10,
 179     IMPORT = 11,
 180     IMPORT_SHLIB = 12,
 181   };
 182
 183 struct unwind_table_entry *find_unwind_entry (CORE_ADDR);
 184
 185 /* We use the objfile->obj_private pointer for two things:
 186  * 1.  An unwind table;
 187  *
 188  * 2.  A pointer to any associated shared library object.
 189  *
 190  * #defines are used to help refer to these objects.
 191  */
 192
 193 /* Info about the unwind table associated with an object file.
 194  * This is hung off of the "objfile->obj_private" pointer, and
 195  * is allocated in the objfile's psymbol obstack.  This allows
 196  * us to have unique unwind info for each executable and shared
 197  * library that we are debugging.
 198  */
 199 struct hppa_unwind_info
 200   {
 201     struct unwind_table_entry *table;   /* Pointer to unwind info */
 202     struct unwind_table_entry *cache;   /* Pointer to last entry we found */
 203     int last;                   /* Index of last entry */
 204   };
 205
 206 struct hppa_objfile_private
 207   {
 208     struct hppa_unwind_info *unwind_info;       /* a pointer */
 209     struct so_list *so_info;    /* a pointer  */
 210     CORE_ADDR dp;
 211
 212     int dummy_call_sequence_reg;
 213     CORE_ADDR dummy_call_sequence_addr;
 214   };
 215
 216 extern const struct objfile_data *hppa_objfile_priv_data;
 217
 218 int hppa_get_field (unsigned word, int from, int to);
 219 int hppa_extract_5_load (unsigned int);
 220 unsigned hppa_extract_5R_store (unsigned int);
 221 unsigned hppa_extract_5r_store (unsigned int);
 222 int hppa_extract_17 (unsigned int);
 223 int hppa_extract_21 (unsigned);
 224 int hppa_extract_14 (unsigned);
 225 int hppa_low_sign_extend (unsigned int, unsigned int);
 226 int hppa_sign_extend (unsigned int, unsigned int);
 227 CORE_ADDR hppa_symbol_address(const char *sym);
 228
 229 void
 230 hppa_frame_prev_register_helper (struct frame_info *next_frame,
 231                                  struct trad_frame_saved_reg *saved_regs,
 232                                  int regnum, int *optimizedp,
 233                                  enum lval_type *lvalp, CORE_ADDR *addrp,
 234                                  int *realnump, void *valuep);
 235
 236 extern CORE_ADDR hppa_read_pc (ptid_t ptid);
 237 extern void hppa_write_pc (CORE_ADDR pc, ptid_t ptid);
 238 extern CORE_ADDR hppa_unwind_pc (struct gdbarch *gdbarch,
 239                                  struct frame_info *next_frame);
 240
 241 extern struct minimal_symbol *
 242   hppa_lookup_stub_minimal_symbol (const char *name,
 243                                    enum unwind_stub_types stub_type);
 244
 245 extern struct hppa_objfile_private *
 246 hppa_init_objfile_priv_data (struct objfile *objfile);
 247
 248 #endif  /* HPPA_TDEP_H */