gdb/hppa-tdep.h

   1 /* Target-dependent code for the HP PA-RISC architecture.
   2
   3    Copyright 2003, 2004, 2005 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef HPPA_TDEP_H
  23 #define HPPA_TDEP_H
  24
  25 struct trad_frame_saved_reg;
  26 struct objfile;
  27 struct so_list;
  28
  29 /* Register numbers of various important registers.
  30    Note that some of these values are "real" register numbers,
  31    and correspond to the general registers of the machine,
  32    and some are "phony" register numbers which are too large
  33    to be actual register numbers as far as the user is concerned
  34    but do serve to get the desired values when passed to read_register.  */
  35
  36 enum hppa_regnum
  37 {
  38   HPPA_R0_REGNUM = 0,           /* Doesn't actually exist, used as base for
  39                                    other r registers.  */
  40   HPPA_R1_REGNUM = 1,
  41   HPPA_FLAGS_REGNUM = 0,        /* Various status flags */
  42   HPPA_RP_REGNUM = 2,           /* return pointer */
  43   HPPA_FP_REGNUM = 3,           /* The ABI's frame pointer, when used */
  44   HPPA_DP_REGNUM = 27,
  45   HPPA_RET0_REGNUM = 28,
  46   HPPA_RET1_REGNUM = 29,
  47   HPPA_SP_REGNUM = 30,          /* Stack pointer.  */
  48   HPPA_R31_REGNUM = 31,
  49   HPPA_SAR_REGNUM = 32,         /* Shift Amount Register */
  50   HPPA_IPSW_REGNUM = 41,        /* Interrupt Processor Status Word */
  51   HPPA_PCOQ_HEAD_REGNUM = 33,   /* instruction offset queue head */
  52   HPPA_PCSQ_HEAD_REGNUM = 34,   /* instruction space queue head */
  53   HPPA_PCOQ_TAIL_REGNUM = 35,   /* instruction offset queue tail */
  54   HPPA_PCSQ_TAIL_REGNUM = 36,   /* instruction space queue tail */
  55   HPPA_EIEM_REGNUM = 37,        /* External Interrupt Enable Mask */
  56   HPPA_IIR_REGNUM = 38,         /* Interrupt Instruction Register */
  57   HPPA_ISR_REGNUM = 39,         /* Interrupt Space Register */
  58   HPPA_IOR_REGNUM = 40,         /* Interrupt Offset Register */
  59   HPPA_SR4_REGNUM = 43,         /* space register 4 */
  60   HPPA_RCR_REGNUM = 51,         /* Recover Counter (also known as cr0) */
  61   HPPA_PID0_REGNUM = 52,        /* Protection ID */
  62   HPPA_PID1_REGNUM = 53,        /* Protection ID */
  63   HPPA_PID2_REGNUM = 55,        /* Protection ID */
  64   HPPA_PID3_REGNUM = 56,        /* Protection ID */
  65   HPPA_CCR_REGNUM = 54,         /* Coprocessor Configuration Register */
  66   HPPA_TR0_REGNUM = 57,         /* Temporary Registers (cr24 -> cr31) */
  67   HPPA_CR27_REGNUM = 60,        /* Base register for thread-local storage, cr27 */
  68   HPPA_FP0_REGNUM = 64,         /* First floating-point.  */
  69   HPPA_FP4_REGNUM = 72,
  70   HPPA64_FP4_REGNUM = 68,
  71
  72   HPPA_ARG0_REGNUM = 26,        /* The first argument of a callee. */
  73   HPPA_ARG1_REGNUM = 25,        /* The second argument of a callee. */
  74   HPPA_ARG2_REGNUM = 24,        /* The third argument of a callee. */
  75   HPPA_ARG3_REGNUM = 23         /* The fourth argument of a callee. */
  76 };
  77
  78 /* Target-dependent structure in gdbarch.  */
  79 struct gdbarch_tdep
  80 {
  81   /* The number of bytes in an address.  For now, this field is designed
  82      to allow us to differentiate hppa32 from hppa64 targets.  */
  83   int bytes_per_address;
  84
  85   /* Is this an ELF target? This can be 64-bit HP-UX, or a 32/64-bit GNU/Linux
  86      system.  */
  87   int is_elf;
  88
  89   /* Given a function address, try to find the global pointer for the
  90      corresponding shared object.  */
  91   CORE_ADDR (*find_global_pointer) (struct value *);
  92
  93   /* For shared libraries, each call goes through a small piece of
  94      trampoline code in the ".plt", or equivalent, section.
  95      IN_SOLIB_CALL_TRAMPOLINE evaluates to nonzero if we are currently
  96      stopped in one of these.  */
  97   int (*in_solib_call_trampoline) (CORE_ADDR pc, char *name);
  98
  99   /* For targets that support multiple spaces, we may have additional stubs
 100      in the return path.  These stubs are internal to the ABI, and users are
 101      not interested in them.  If we detect that we are returning to a stub,
 102      adjust the pc to the real caller.  This improves the behavior of commands
 103      that traverse frames such as "up" and "finish".  */
 104   void (*unwind_adjust_stub) (struct frame_info *next_frame, CORE_ADDR base,
 105                               struct trad_frame_saved_reg *saved_regs);
 106
 107   /* These are solib-dependent methods.  They are really HPUX only, but
 108      we don't have a HPUX-specific tdep vector at the moment.  */
 109   CORE_ADDR (*solib_thread_start_addr) (struct so_list *so);
 110   CORE_ADDR (*solib_get_got_by_pc) (CORE_ADDR addr);
 111   CORE_ADDR (*solib_get_solib_by_pc) (CORE_ADDR addr);
 112   CORE_ADDR (*solib_get_text_base) (struct objfile *objfile);
 113 };
 114
 115 /*
 116  * Unwind table and descriptor.
 117  */
 118
 119 struct unwind_table_entry
 120   {
 121     CORE_ADDR region_start;
 122     CORE_ADDR region_end;
 123
 124     unsigned int Cannot_unwind:1;       /* 0 */
 125     unsigned int Millicode:1;   /* 1 */
 126     unsigned int Millicode_save_sr0:1;  /* 2 */
 127     unsigned int Region_description:2;  /* 3..4 */
 128     unsigned int reserved1:1;   /* 5 */
 129     unsigned int Entry_SR:1;    /* 6 */
 130     unsigned int Entry_FR:4;    /* number saved *//* 7..10 */
 131     unsigned int Entry_GR:5;    /* number saved *//* 11..15 */
 132     unsigned int Args_stored:1; /* 16 */
 133     unsigned int Variable_Frame:1;      /* 17 */
 134     unsigned int Separate_Package_Body:1;       /* 18 */
 135     unsigned int Frame_Extension_Millicode:1;   /* 19 */
 136     unsigned int Stack_Overflow_Check:1;        /* 20 */
 137     unsigned int Two_Instruction_SP_Increment:1;        /* 21 */
 138     unsigned int Ada_Region:1;  /* 22 */
 139     unsigned int cxx_info:1;    /* 23 */
 140     unsigned int cxx_try_catch:1;       /* 24 */
 141     unsigned int sched_entry_seq:1;     /* 25 */
 142     unsigned int reserved2:1;   /* 26 */
 143     unsigned int Save_SP:1;     /* 27 */
 144     unsigned int Save_RP:1;     /* 28 */
 145     unsigned int Save_MRP_in_frame:1;   /* 29 */
 146     unsigned int extn_ptr_defined:1;    /* 30 */
 147     unsigned int Cleanup_defined:1;     /* 31 */
 148
 149     unsigned int MPE_XL_interrupt_marker:1;     /* 0 */
 150     unsigned int HP_UX_interrupt_marker:1;      /* 1 */
 151     unsigned int Large_frame:1; /* 2 */
 152     unsigned int Pseudo_SP_Set:1;       /* 3 */
 153     unsigned int reserved4:1;   /* 4 */
 154     unsigned int Total_frame_size:27;   /* 5..31 */
 155
 156     /* This is *NOT* part of an actual unwind_descriptor in an object
 157        file.  It is *ONLY* part of the "internalized" descriptors that
 158        we create from those in a file.
 159      */
 160     struct
 161       {
 162         unsigned int stub_type:4;       /* 0..3 */
 163         unsigned int padding:28;        /* 4..31 */
 164       }
 165     stub_unwind;
 166   };
 167
 168 /* HP linkers also generate unwinds for various linker-generated stubs.
 169    GDB reads in the stubs from the $UNWIND_END$ subspace, then
 170    "converts" them into normal unwind entries using some of the reserved
 171    fields to store the stub type.  */
 172
 173 /* The gaps represent linker stubs used in MPE and space for future
 174    expansion.  */
 175 enum unwind_stub_types
 176   {
 177     LONG_BRANCH = 1,
 178     PARAMETER_RELOCATION = 2,
 179     EXPORT = 10,
 180     IMPORT = 11,
 181     IMPORT_SHLIB = 12,
 182   };
 183
 184 struct unwind_table_entry *find_unwind_entry (CORE_ADDR);
 185
 186 /* We use the objfile->obj_private pointer for two things:
 187  * 1.  An unwind table;
 188  *
 189  * 2.  A pointer to any associated shared library object.
 190  *
 191  * #defines are used to help refer to these objects.
 192  */
 193
 194 /* Info about the unwind table associated with an object file.
 195  * This is hung off of the "objfile->obj_private" pointer, and
 196  * is allocated in the objfile's psymbol obstack.  This allows
 197  * us to have unique unwind info for each executable and shared
 198  * library that we are debugging.
 199  */
 200 struct hppa_unwind_info
 201   {
 202     struct unwind_table_entry *table;   /* Pointer to unwind info */
 203     struct unwind_table_entry *cache;   /* Pointer to last entry we found */
 204     int last;                   /* Index of last entry */
 205   };
 206
 207 struct hppa_objfile_private
 208   {
 209     struct hppa_unwind_info *unwind_info;       /* a pointer */
 210     struct so_list *so_info;    /* a pointer  */
 211     CORE_ADDR dp;
 212
 213     int dummy_call_sequence_reg;
 214     CORE_ADDR dummy_call_sequence_addr;
 215   };
 216
 217 extern const struct objfile_data *hppa_objfile_priv_data;
 218
 219 int hppa_get_field (unsigned word, int from, int to);
 220 int hppa_extract_5_load (unsigned int);
 221 unsigned hppa_extract_5R_store (unsigned int);
 222 unsigned hppa_extract_5r_store (unsigned int);
 223 int hppa_extract_17 (unsigned int);
 224 int hppa_extract_21 (unsigned);
 225 int hppa_extract_14 (unsigned);
 226 int hppa_low_sign_extend (unsigned int, unsigned int);
 227 int hppa_sign_extend (unsigned int, unsigned int);
 228 CORE_ADDR hppa_symbol_address(const char *sym);
 229
 230 extern void
 231   hppa_frame_prev_register_helper (struct frame_info *next_frame,
 232                                    struct trad_frame_saved_reg *saved_regs,
 233                                    int regnum, int *optimizedp,
 234                                    enum lval_type *lvalp, CORE_ADDR *addrp,
 235                                    int *realnump, gdb_byte *valuep);
 236
 237 extern CORE_ADDR hppa_read_pc (ptid_t ptid);
 238 extern void hppa_write_pc (CORE_ADDR pc, ptid_t ptid);
 239 extern CORE_ADDR hppa_unwind_pc (struct gdbarch *gdbarch,
 240                                  struct frame_info *next_frame);
 241
 242 extern struct minimal_symbol *
 243   hppa_lookup_stub_minimal_symbol (const char *name,
 244                                    enum unwind_stub_types stub_type);
 245
 246 extern struct hppa_objfile_private *
 247 hppa_init_objfile_priv_data (struct objfile *objfile);
 248
 249 #endif  /* HPPA_TDEP_H */