gdb/arch-utils.h

   1 /* Dynamic architecture support for GDB, the GNU debugger.
   2
   3    Copyright (C) 1998, 1999, 2000, 2002, 2003, 2004, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GDBARCH_UTILS_H
  22 #define GDBARCH_UTILS_H
  23
  24 struct gdbarch;
  25 struct frame_info;
  26 struct minimal_symbol;
  27 struct type;
  28 struct gdbarch_info;
  29
  30 /* gdbarch trace variable */
  31 extern int gdbarch_debug;
  32
  33 /* An implementation of gdbarch_displaced_step_copy_insn for
  34    processors that don't need to modify the instruction before
  35    single-stepping the displaced copy.
  36
  37    Simply copy gdbarch_max_insn_length (ARCH) bytes from FROM to TO.
  38    The closure is an array of that many bytes containing the
  39    instruction's bytes, allocated with xmalloc.  */
  40 extern struct displaced_step_closure *
  41   simple_displaced_step_copy_insn (struct gdbarch *gdbarch,
  42                                    CORE_ADDR from, CORE_ADDR to,
  43                                    struct regcache *regs);
  44
  45 /* Simple implementation of gdbarch_displaced_step_free_closure: Call
  46    xfree.
  47    This is appropriate for use with simple_displaced_step_copy_insn.  */
  48 extern void
  49   simple_displaced_step_free_closure (struct gdbarch *gdbarch,
  50                                       struct displaced_step_closure *closure);
  51
  52 /* Possible value for gdbarch_displaced_step_location:
  53    Place displaced instructions at the program's entry point,
  54    leaving space for inferior function call return breakpoints.  */
  55 extern CORE_ADDR displaced_step_at_entry_point (struct gdbarch *gdbarch);
  56
  57 /* The only possible cases for inner_than. */
  58 extern int core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs);
  59 extern int core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs);
  60
  61 /* Identity functions on a CORE_ADDR.  Just return the "addr".  */
  62
  63 extern CORE_ADDR core_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr);
  64 extern gdbarch_convert_from_func_ptr_addr_ftype convert_from_func_ptr_addr_identity;
  65
  66 /* No-op conversion of reg to regnum. */
  67
  68 extern int no_op_reg_to_regnum (struct gdbarch *gdbarch, int reg);
  69
  70 /* Do nothing version of elf_make_msymbol_special. */
  71
  72 void default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym);
  73
  74 /* Do nothing version of coff_make_msymbol_special. */
  75
  76 void default_coff_make_msymbol_special (int val, struct minimal_symbol *msym);
  77
  78 /* Version of cannot_fetch_register() / cannot_store_register() that
  79    always fails. */
  80
  81 int cannot_register_not (struct gdbarch *gdbarch, int regnum);
  82
  83 /* Legacy version of target_virtual_frame_pointer().  Assumes that
  84    there is an gdbarch_deprecated_fp_regnum and that it is the same, cooked or
  85    raw.  */
  86
  87 extern gdbarch_virtual_frame_pointer_ftype legacy_virtual_frame_pointer;
  88
  89 extern CORE_ADDR generic_skip_trampoline_code (struct frame_info *frame,
  90                                                CORE_ADDR pc);
  91
  92 extern CORE_ADDR generic_skip_solib_resolver (struct gdbarch *gdbarch,
  93                                               CORE_ADDR pc);
  94
  95 extern int generic_in_solib_return_trampoline (struct gdbarch *gdbarch,
  96                                                CORE_ADDR pc, char *name);
  97
  98 extern int generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc);
  99
 100 /* By default, registers are not convertible.  */
 101 extern int generic_convert_register_p (struct gdbarch *gdbarch, int regnum,
 102                                        struct type *type);
 103
 104 extern int default_stabs_argument_has_addr (struct gdbarch *gdbarch,
 105                                             struct type *type);
 106
 107 extern int generic_instruction_nullified (struct gdbarch *gdbarch,
 108                                           struct regcache *regcache);
 109
 110 int default_remote_register_number (struct gdbarch *gdbarch,
 111                                     int regno);
 112
 113 /* For compatibility with older architectures, returns
 114    (LEGACY_SIM_REGNO_IGNORE) when the register doesn't have a valid
 115    name.  */
 116
 117 extern int legacy_register_sim_regno (struct gdbarch *gdbarch, int regnum);
 118
 119 /* Return the selected byte order, or BFD_ENDIAN_UNKNOWN if no byte
 120    order was explicitly selected.  */
 121 extern enum bfd_endian selected_byte_order (void);
 122
 123 /* Return the selected architecture's name, or NULL if no architecture
 124    was explicitly selected.  */
 125 extern const char *selected_architecture_name (void);
 126
 127 /* Initialize a ``struct info''.  Can't use memset(0) since some
 128    default values are not zero.  "fill" takes all available
 129    information and fills in any unspecified fields.  */
 130
 131 extern void gdbarch_info_init (struct gdbarch_info *info);
 132
 133 /* Similar to init, but this time fill in the blanks.  Information is
 134    obtained from the global "set ..." options and explicitly
 135    initialized INFO fields.  */
 136 extern void gdbarch_info_fill (struct gdbarch_info *info);
 137
 138 /* Return the architecture for ABFD.  If no suitable architecture
 139    could be find, return NULL.  */
 140
 141 extern struct gdbarch *gdbarch_from_bfd (bfd *abfd);
 142
 143 /* Return "current" architecture.  If the target is running, this is the
 144    architecture of the selected frame.  Otherwise, the "current" architecture
 145    defaults to the target architecture.
 146
 147    This function should normally be called solely by the command interpreter
 148    routines to determine the architecture to execute a command in.  */
 149 extern struct gdbarch *get_current_arch (void);
 150
 151 #endif