gdb/arch-utils.h

   1 /* Dynamic architecture support for GDB, the GNU debugger.
   2
   3    Copyright (C) 1998-2015 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 GDBARCH_UTILS_H
  21 #define GDBARCH_UTILS_H
  22
  23 struct gdbarch;
  24 struct frame_info;
  25 struct minimal_symbol;
  26 struct type;
  27 struct gdbarch_info;
  28
  29 /* An implementation of gdbarch_displaced_step_copy_insn for
  30    processors that don't need to modify the instruction before
  31    single-stepping the displaced copy.
  32
  33    Simply copy gdbarch_max_insn_length (ARCH) bytes from FROM to TO.
  34    The closure is an array of that many bytes containing the
  35    instruction's bytes, allocated with xmalloc.  */
  36 extern struct displaced_step_closure *
  37   simple_displaced_step_copy_insn (struct gdbarch *gdbarch,
  38                                    CORE_ADDR from, CORE_ADDR to,
  39                                    struct regcache *regs);
  40
  41 /* Simple implementation of gdbarch_displaced_step_free_closure: Call
  42    xfree.
  43    This is appropriate for use with simple_displaced_step_copy_insn.  */
  44 extern void
  45   simple_displaced_step_free_closure (struct gdbarch *gdbarch,
  46                                       struct displaced_step_closure *closure);
  47
  48 /* Default implementation of gdbarch_displaced_hw_singlestep.  */
  49 extern int
  50   default_displaced_step_hw_singlestep (struct gdbarch *,
  51                                         struct displaced_step_closure *);
  52
  53 /* Possible value for gdbarch_displaced_step_location:
  54    Place displaced instructions at the program's entry point,
  55    leaving space for inferior function call return breakpoints.  */
  56 extern CORE_ADDR displaced_step_at_entry_point (struct gdbarch *gdbarch);
  57
  58 /* The only possible cases for inner_than.  */
  59 extern int core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs);
  60 extern int core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs);
  61
  62 /* Identity functions on a CORE_ADDR.  Just return the "addr".  */
  63
  64 extern CORE_ADDR core_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr);
  65 extern gdbarch_convert_from_func_ptr_addr_ftype convert_from_func_ptr_addr_identity;
  66
  67 /* No-op conversion of reg to regnum.  */
  68
  69 extern int no_op_reg_to_regnum (struct gdbarch *gdbarch, int reg);
  70
  71 /* Do nothing version of coff_make_msymbol_special.  */
  72
  73 void default_coff_make_msymbol_special (int val, struct minimal_symbol *msym);
  74
  75 /* Do nothing default implementation of gdbarch_make_symbol_special.  */
  76
  77 void default_make_symbol_special (struct symbol *sym, struct objfile *objfile);
  78
  79 /* Do nothing default implementation of gdbarch_adjust_dwarf2_addr.  */
  80
  81 CORE_ADDR default_adjust_dwarf2_addr (CORE_ADDR pc);
  82
  83 /* Do nothing default implementation of gdbarch_adjust_dwarf2_line.  */
  84
  85 CORE_ADDR default_adjust_dwarf2_line (CORE_ADDR addr, int rel);
  86
  87 /* Version of cannot_fetch_register() / cannot_store_register() that
  88    always fails.  */
  89
  90 int cannot_register_not (struct gdbarch *gdbarch, int regnum);
  91
  92 /* Legacy version of target_virtual_frame_pointer().  Assumes that
  93    there is an gdbarch_deprecated_fp_regnum and that it is the same, cooked or
  94    raw.  */
  95
  96 extern gdbarch_virtual_frame_pointer_ftype legacy_virtual_frame_pointer;
  97
  98 extern CORE_ADDR generic_skip_trampoline_code (struct frame_info *frame,
  99                                                CORE_ADDR pc);
 100
 101 extern CORE_ADDR generic_skip_solib_resolver (struct gdbarch *gdbarch,
 102                                               CORE_ADDR pc);
 103
 104 extern int generic_in_solib_return_trampoline (struct gdbarch *gdbarch,
 105                                                CORE_ADDR pc, const char *name);
 106
 107 extern int generic_stack_frame_destroyed_p (struct gdbarch *gdbarch,
 108                                             CORE_ADDR pc);
 109
 110 /* By default, registers are not convertible.  */
 111 extern int generic_convert_register_p (struct gdbarch *gdbarch, int regnum,
 112                                        struct type *type);
 113
 114 extern int default_stabs_argument_has_addr (struct gdbarch *gdbarch,
 115                                             struct type *type);
 116
 117 extern int generic_instruction_nullified (struct gdbarch *gdbarch,
 118                                           struct regcache *regcache);
 119
 120 int default_remote_register_number (struct gdbarch *gdbarch,
 121                                     int regno);
 122
 123 /* For compatibility with older architectures, returns
 124    (LEGACY_SIM_REGNO_IGNORE) when the register doesn't have a valid
 125    name.  */
 126
 127 extern int legacy_register_sim_regno (struct gdbarch *gdbarch, int regnum);
 128
 129 /* Return the selected byte order, or BFD_ENDIAN_UNKNOWN if no byte
 130    order was explicitly selected.  */
 131 extern enum bfd_endian selected_byte_order (void);
 132
 133 /* Return the selected architecture's name, or NULL if no architecture
 134    was explicitly selected.  */
 135 extern const char *selected_architecture_name (void);
 136
 137 /* Initialize a ``struct info''.  Can't use memset(0) since some
 138    default values are not zero.  "fill" takes all available
 139    information and fills in any unspecified fields.  */
 140
 141 extern void gdbarch_info_init (struct gdbarch_info *info);
 142
 143 /* Similar to init, but this time fill in the blanks.  Information is
 144    obtained from the global "set ..." options and explicitly
 145    initialized INFO fields.  */
 146 extern void gdbarch_info_fill (struct gdbarch_info *info);
 147
 148 /* Return the architecture for ABFD.  If no suitable architecture
 149    could be find, return NULL.  */
 150
 151 extern struct gdbarch *gdbarch_from_bfd (bfd *abfd);
 152
 153 /* Return "current" architecture.  If the target is running, this is the
 154    architecture of the selected frame.  Otherwise, the "current" architecture
 155    defaults to the target architecture.
 156
 157    This function should normally be called solely by the command interpreter
 158    routines to determine the architecture to execute a command in.  */
 159 extern struct gdbarch *get_current_arch (void);
 160
 161 extern int default_has_shared_address_space (struct gdbarch *);
 162
 163 extern int default_fast_tracepoint_valid_at (struct gdbarch *gdbarch,
 164                                              CORE_ADDR addr, char **msg);
 165
 166 extern void default_remote_breakpoint_from_pc (struct gdbarch *,
 167                                                CORE_ADDR *pcptr, int *kindptr);
 168
 169 extern void default_gen_return_address (struct gdbarch *gdbarch,
 170                                         struct agent_expr *ax,
 171                                         struct axs_value *value,
 172                                         CORE_ADDR scope);
 173
 174 extern const char *default_auto_charset (void);
 175 extern const char *default_auto_wide_charset (void);
 176
 177 extern int default_return_in_first_hidden_param_p (struct gdbarch *,
 178                                                    struct type *);
 179
 180 extern int default_insn_is_call (struct gdbarch *, CORE_ADDR);
 181 extern int default_insn_is_ret (struct gdbarch *, CORE_ADDR);
 182 extern int default_insn_is_jump (struct gdbarch *, CORE_ADDR);
 183
 184 /* Do-nothing version of vsyscall_range.  Returns false.  */
 185
 186 extern int default_vsyscall_range (struct gdbarch *gdbarch, struct mem_range *range);
 187
 188 /* Default way to advance the PC to the next instruction in order to
 189    skip a permanent breakpoint.  Increments the PC by the size of a
 190    software breakpoint instruction, as determined with
 191    gdbarch_breakpoint_from_pc.  This matches how the breakpoints
 192    module determines whether a breakpoint is permanent.  */
 193 extern void default_skip_permanent_breakpoint (struct regcache *regcache);
 194
 195 /* Symbols for gdbarch_infcall_mmap; their Linux PROT_* system
 196    definitions would be dependent on compilation host.  */
 197 #define GDB_MMAP_PROT_READ      0x1     /* Page can be read.  */
 198 #define GDB_MMAP_PROT_WRITE     0x2     /* Page can be written.  */
 199 #define GDB_MMAP_PROT_EXEC      0x4     /* Page can be executed.  */
 200
 201 extern CORE_ADDR default_infcall_mmap (CORE_ADDR size, unsigned prot);
 202 extern void default_infcall_munmap (CORE_ADDR addr, CORE_ADDR size);
 203 extern char *default_gcc_target_options (struct gdbarch *gdbarch);
 204 extern const char *default_gnu_triplet_regexp (struct gdbarch *gdbarch);
 205 extern int default_addressable_memory_unit_size (struct gdbarch *gdbarch);
 206
 207 #endif