gdb/hppa-tdep.h

   1 /* Target-dependent code for the HP PA-RISC architecture.
   2
   3    Copyright (C) 2003, 2004, 2005, 2006, 2007 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef HPPA_TDEP_H
  21 #define HPPA_TDEP_H
  22
  23 struct trad_frame_saved_reg;
  24 struct objfile;
  25 struct so_list;
  26
  27 /* Register numbers of various important registers.  */
  28
  29 enum hppa_regnum
  30 {
  31   HPPA_R0_REGNUM = 0,           /* Doesn't actually exist, used as base for
  32                                    other r registers.  */
  33   HPPA_R1_REGNUM = 1,
  34   HPPA_FLAGS_REGNUM = 0,        /* Various status flags */
  35   HPPA_RP_REGNUM = 2,           /* return pointer */
  36   HPPA_FP_REGNUM = 3,           /* The ABI's frame pointer, when used */
  37   HPPA_DP_REGNUM = 27,
  38   HPPA_RET0_REGNUM = 28,
  39   HPPA_RET1_REGNUM = 29,
  40   HPPA_SP_REGNUM = 30,          /* Stack pointer.  */
  41   HPPA_R31_REGNUM = 31,
  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   HPPA64_FP4_REGNUM = 68,
  64   HPPA_FP31R_REGNUM = 127,      /* Last floating-point.  */
  65
  66   HPPA_ARG0_REGNUM = 26,        /* The first argument of a callee. */
  67   HPPA_ARG1_REGNUM = 25,        /* The second argument of a callee. */
  68   HPPA_ARG2_REGNUM = 24,        /* The third argument of a callee. */
  69   HPPA_ARG3_REGNUM = 23         /* The fourth argument of a callee. */
  70 };
  71
  72 /* Instruction size.  */
  73 #define HPPA_INSN_SIZE 4
  74
  75 /* Target-dependent structure in gdbarch.  */
  76 struct gdbarch_tdep
  77 {
  78   /* The number of bytes in an address.  For now, this field is designed
  79      to allow us to differentiate hppa32 from hppa64 targets.  */
  80   int bytes_per_address;
  81
  82   /* Is this an ELF target? This can be 64-bit HP-UX, or a 32/64-bit GNU/Linux
  83      system.  */
  84   int is_elf;
  85
  86   /* Given a function address, try to find the global pointer for the
  87      corresponding shared object.  */
  88   CORE_ADDR (*find_global_pointer) (struct value *);
  89
  90   /* For shared libraries, each call goes through a small piece of
  91      trampoline code in the ".plt", or equivalent, section.
  92      IN_SOLIB_CALL_TRAMPOLINE evaluates to nonzero if we are currently
  93      stopped in one of these.  */
  94   int (*in_solib_call_trampoline) (CORE_ADDR pc, char *name);
  95
  96   /* For targets that support multiple spaces, we may have additional stubs
  97      in the return path.  These stubs are internal to the ABI, and users are
  98      not interested in them.  If we detect that we are returning to a stub,
  99      adjust the pc to the real caller.  This improves the behavior of commands
 100      that traverse frames such as "up" and "finish".  */
 101   void (*unwind_adjust_stub) (struct frame_info *next_frame, CORE_ADDR base,
 102                               struct trad_frame_saved_reg *saved_regs);
 103
 104   /* These are solib-dependent methods.  They are really HPUX only, but
 105      we don't have a HPUX-specific tdep vector at the moment.  */
 106   CORE_ADDR (*solib_thread_start_addr) (struct so_list *so);
 107   CORE_ADDR (*solib_get_got_by_pc) (CORE_ADDR addr);
 108   CORE_ADDR (*solib_get_solib_by_pc) (CORE_ADDR addr);
 109   CORE_ADDR (*solib_get_text_base) (struct objfile *objfile);
 110 };
 111
 112 /*
 113  * Unwind table and descriptor.
 114  */
 115
 116 struct unwind_table_entry
 117   {
 118     CORE_ADDR region_start;
 119     CORE_ADDR region_end;
 120
 121     unsigned int Cannot_unwind:1;       /* 0 */
 122     unsigned int Millicode:1;   /* 1 */
 123     unsigned int Millicode_save_sr0:1;  /* 2 */
 124     unsigned int Region_description:2;  /* 3..4 */
 125     unsigned int reserved:1;    /* 5 */
 126     unsigned int Entry_SR:1;    /* 6 */
 127     unsigned int Entry_FR:4;    /* number saved *//* 7..10 */
 128     unsigned int Entry_GR:5;    /* number saved *//* 11..15 */
 129     unsigned int Args_stored:1; /* 16 */
 130     unsigned int Variable_Frame:1;      /* 17 */
 131     unsigned int Separate_Package_Body:1;       /* 18 */
 132     unsigned int Frame_Extension_Millicode:1;   /* 19 */
 133     unsigned int Stack_Overflow_Check:1;        /* 20 */
 134     unsigned int Two_Instruction_SP_Increment:1;        /* 21 */
 135     unsigned int sr4export:1;   /* 22 */
 136     unsigned int cxx_info:1;    /* 23 */
 137     unsigned int cxx_try_catch:1;       /* 24 */
 138     unsigned int sched_entry_seq:1;     /* 25 */
 139     unsigned int reserved1:1;   /* 26 */
 140     unsigned int Save_SP:1;     /* 27 */
 141     unsigned int Save_RP:1;     /* 28 */
 142     unsigned int Save_MRP_in_frame:1;   /* 29 */
 143     unsigned int save_r19:1;    /* 30 */
 144     unsigned int Cleanup_defined:1;     /* 31 */
 145
 146     unsigned int MPE_XL_interrupt_marker:1;     /* 0 */
 147     unsigned int HP_UX_interrupt_marker:1;      /* 1 */
 148     unsigned int Large_frame:1; /* 2 */
 149     unsigned int alloca_frame:1;        /* 3 */
 150     unsigned int reserved2:1;   /* 4 */
 151     unsigned int Total_frame_size:27;   /* 5..31 */
 152
 153     /* This is *NOT* part of an actual unwind_descriptor in an object
 154        file.  It is *ONLY* part of the "internalized" descriptors that
 155        we create from those in a file.
 156      */
 157     struct
 158       {
 159         unsigned int stub_type:4;       /* 0..3 */
 160         unsigned int padding:28;        /* 4..31 */
 161       }
 162     stub_unwind;
 163   };
 164
 165 /* HP linkers also generate unwinds for various linker-generated stubs.
 166    GDB reads in the stubs from the $UNWIND_END$ subspace, then
 167    "converts" them into normal unwind entries using some of the reserved
 168    fields to store the stub type.  */
 169
 170 /* The gaps represent linker stubs used in MPE and space for future
 171    expansion.  */
 172 enum unwind_stub_types
 173   {
 174     LONG_BRANCH = 1,
 175     PARAMETER_RELOCATION = 2,
 176     EXPORT = 10,
 177     IMPORT = 11,
 178     IMPORT_SHLIB = 12,
 179   };
 180
 181 struct unwind_table_entry *find_unwind_entry (CORE_ADDR);
 182
 183 /* We use the objfile->obj_private pointer for two things:
 184  * 1.  An unwind table;
 185  *
 186  * 2.  A pointer to any associated shared library object.
 187  *
 188  * #defines are used to help refer to these objects.
 189  */
 190
 191 /* Info about the unwind table associated with an object file.
 192  * This is hung off of the "objfile->obj_private" pointer, and
 193  * is allocated in the objfile's psymbol obstack.  This allows
 194  * us to have unique unwind info for each executable and shared
 195  * library that we are debugging.
 196  */
 197 struct hppa_unwind_info
 198   {
 199     struct unwind_table_entry *table;   /* Pointer to unwind info */
 200     struct unwind_table_entry *cache;   /* Pointer to last entry we found */
 201     int last;                   /* Index of last entry */
 202   };
 203
 204 struct hppa_objfile_private
 205   {
 206     struct hppa_unwind_info *unwind_info;       /* a pointer */
 207     struct so_list *so_info;    /* a pointer  */
 208     CORE_ADDR dp;
 209
 210     int dummy_call_sequence_reg;
 211     CORE_ADDR dummy_call_sequence_addr;
 212   };
 213
 214 extern const struct objfile_data *hppa_objfile_priv_data;
 215
 216 int hppa_get_field (unsigned word, int from, int to);
 217 int hppa_extract_5_load (unsigned int);
 218 unsigned hppa_extract_5R_store (unsigned int);
 219 unsigned hppa_extract_5r_store (unsigned int);
 220 int hppa_extract_17 (unsigned int);
 221 int hppa_extract_21 (unsigned);
 222 int hppa_extract_14 (unsigned);
 223 int hppa_low_sign_extend (unsigned int, unsigned int);
 224 int hppa_sign_extend (unsigned int, unsigned int);
 225 CORE_ADDR hppa_symbol_address(const char *sym);
 226
 227 extern void
 228   hppa_frame_prev_register_helper (struct frame_info *next_frame,
 229                                    struct trad_frame_saved_reg *saved_regs,
 230                                    int regnum, int *optimizedp,
 231                                    enum lval_type *lvalp, CORE_ADDR *addrp,
 232                                    int *realnump, gdb_byte *valuep);
 233
 234 extern CORE_ADDR hppa_read_pc (struct regcache *regcache);
 235 extern void hppa_write_pc (struct regcache *regcache, CORE_ADDR pc);
 236 extern CORE_ADDR hppa_unwind_pc (struct gdbarch *gdbarch,
 237                                  struct frame_info *next_frame);
 238
 239 extern struct minimal_symbol *
 240   hppa_lookup_stub_minimal_symbol (const char *name,
 241                                    enum unwind_stub_types stub_type);
 242
 243 extern struct hppa_objfile_private *
 244 hppa_init_objfile_priv_data (struct objfile *objfile);
 245
 246 extern int hppa_in_solib_call_trampoline (CORE_ADDR pc, char *name);
 247 extern CORE_ADDR hppa_skip_trampoline_code (struct frame_info *, CORE_ADDR pc);
 248
 249 #endif  /* hppa-tdep.h */