gdb/arm-tdep.h

   1 /* Common target dependent code for GDB on ARM systems.
   2    Copyright (C) 2002, 2003, 2007 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., 51 Franklin Street, Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #ifndef ARM_TDEP_H
  22 #define ARM_TDEP_H
  23
  24 /* Forward declarations.  */
  25 struct gdbarch;
  26 struct regset;
  27
  28 /* Register numbers of various important registers.  Note that some of
  29    these values are "real" register numbers, and correspond to the
  30    general registers of the machine, and some are "phony" register
  31    numbers which are too large to be actual register numbers as far as
  32    the user is concerned but do serve to get the desired values when
  33    passed to read_register.  */
  34
  35 enum gdb_regnum {
  36   ARM_A1_REGNUM = 0,            /* first integer-like argument */
  37   ARM_A4_REGNUM = 3,            /* last integer-like argument */
  38   ARM_AP_REGNUM = 11,
  39   ARM_SP_REGNUM = 13,           /* Contains address of top of stack */
  40   ARM_LR_REGNUM = 14,           /* address to return to from a function call */
  41   ARM_PC_REGNUM = 15,           /* Contains program counter */
  42   ARM_F0_REGNUM = 16,           /* first floating point register */
  43   ARM_F3_REGNUM = 19,           /* last floating point argument register */
  44   ARM_F7_REGNUM = 23,           /* last floating point register */
  45   ARM_FPS_REGNUM = 24,          /* floating point status register */
  46   ARM_PS_REGNUM = 25,           /* Contains processor status */
  47   ARM_WR0_REGNUM,               /* WMMX data registers.  */
  48   ARM_WR15_REGNUM = ARM_WR0_REGNUM + 15,
  49   ARM_WC0_REGNUM,               /* WMMX control registers.  */
  50   ARM_WCSSF_REGNUM = ARM_WC0_REGNUM + 2,
  51   ARM_WCASF_REGNUM = ARM_WC0_REGNUM + 3,
  52   ARM_WC7_REGNUM = ARM_WC0_REGNUM + 7,
  53   ARM_WCGR0_REGNUM,             /* WMMX general purpose registers.  */
  54   ARM_WCGR3_REGNUM = ARM_WCGR0_REGNUM + 3,
  55   ARM_WCGR7_REGNUM = ARM_WCGR0_REGNUM + 7,
  56
  57   ARM_NUM_REGS,
  58
  59   /* Other useful registers.  */
  60   ARM_FP_REGNUM = 11,           /* Frame register in ARM code, if used.  */
  61   THUMB_FP_REGNUM = 7,          /* Frame register in Thumb code, if used.  */
  62   ARM_NUM_ARG_REGS = 4,
  63   ARM_LAST_ARG_REGNUM = ARM_A4_REGNUM,
  64   ARM_NUM_FP_ARG_REGS = 4,
  65   ARM_LAST_FP_ARG_REGNUM = ARM_F3_REGNUM
  66 };
  67
  68 /* Size of integer registers.  */
  69 #define INT_REGISTER_SIZE               4
  70
  71 /* Say how long FP registers are.  Used for documentation purposes and
  72    code readability in this header.  IEEE extended doubles are 80
  73    bits.  DWORD aligned they use 96 bits.  */
  74 #define FP_REGISTER_SIZE        12
  75
  76 /* Status registers are the same size as general purpose registers.
  77    Used for documentation purposes and code readability in this
  78    header.  */
  79 #define STATUS_REGISTER_SIZE    4
  80
  81 /* Number of machine registers.  The only define actually required
  82    is NUM_REGS.  The other definitions are used for documentation
  83    purposes and code readability.  */
  84 /* For 26 bit ARM code, a fake copy of the PC is placed in register 25 (PS)
  85    (and called PS for processor status) so the status bits can be cleared
  86    from the PC (register 15).  For 32 bit ARM code, a copy of CPSR is placed
  87    in PS.  */
  88 #define NUM_FREGS       8       /* Number of floating point registers.  */
  89 #define NUM_SREGS       2       /* Number of status registers.  */
  90 #define NUM_GREGS       16      /* Number of general purpose registers.  */
  91
  92
  93 /* Instruction condition field values.  */
  94 #define INST_EQ         0x0
  95 #define INST_NE         0x1
  96 #define INST_CS         0x2
  97 #define INST_CC         0x3
  98 #define INST_MI         0x4
  99 #define INST_PL         0x5
 100 #define INST_VS         0x6
 101 #define INST_VC         0x7
 102 #define INST_HI         0x8
 103 #define INST_LS         0x9
 104 #define INST_GE         0xa
 105 #define INST_LT         0xb
 106 #define INST_GT         0xc
 107 #define INST_LE         0xd
 108 #define INST_AL         0xe
 109 #define INST_NV         0xf
 110
 111 #define FLAG_N          0x80000000
 112 #define FLAG_Z          0x40000000
 113 #define FLAG_C          0x20000000
 114 #define FLAG_V          0x10000000
 115
 116 /* Type of floating-point code in use by inferior.  There are really 3 models
 117    that are traditionally supported (plus the endianness issue), but gcc can
 118    only generate 2 of those.  The third is APCS_FLOAT, where arguments to
 119    functions are passed in floating-point registers.
 120
 121    In addition to the traditional models, VFP adds two more.
 122
 123    If you update this enum, don't forget to update fp_model_strings in
 124    arm-tdep.c.  */
 125
 126 enum arm_float_model
 127 {
 128   ARM_FLOAT_AUTO,       /* Automatic detection.  Do not set in tdep.  */
 129   ARM_FLOAT_SOFT_FPA,   /* Traditional soft-float (mixed-endian on LE ARM).  */
 130   ARM_FLOAT_FPA,        /* FPA co-processor.  GCC calling convention.  */
 131   ARM_FLOAT_SOFT_VFP,   /* Soft-float with pure-endian doubles.  */
 132   ARM_FLOAT_VFP,        /* Full VFP calling convention.  */
 133   ARM_FLOAT_LAST        /* Keep at end.  */
 134 };
 135
 136 /* ABI used by the inferior.  */
 137 enum arm_abi_kind
 138 {
 139   ARM_ABI_AUTO,
 140   ARM_ABI_APCS,
 141   ARM_ABI_AAPCS,
 142   ARM_ABI_LAST
 143 };
 144
 145 /* Convention for returning structures.  */
 146
 147 enum struct_return
 148 {
 149   pcc_struct_return,            /* Return "short" structures in memory.  */
 150   reg_struct_return             /* Return "short" structures in registers.  */
 151 };
 152
 153 /* Target-dependent structure in gdbarch.  */
 154 struct gdbarch_tdep
 155 {
 156   /* The ABI for this architecture.  It should never be set to
 157      ARM_ABI_AUTO.  */
 158   enum arm_abi_kind arm_abi;
 159
 160   enum arm_float_model fp_model; /* Floating point calling conventions.  */
 161
 162   int have_fpa_registers;       /* Does the target report the FPA registers?  */
 163
 164   CORE_ADDR lowest_pc;          /* Lowest address at which instructions
 165                                    will appear.  */
 166
 167   const char *arm_breakpoint;   /* Breakpoint pattern for an ARM insn.  */
 168   int arm_breakpoint_size;      /* And its size.  */
 169   const char *thumb_breakpoint; /* Breakpoint pattern for an ARM insn.  */
 170   int thumb_breakpoint_size;    /* And its size.  */
 171
 172   int jb_pc;                    /* Offset to PC value in jump buffer.
 173                                    If this is negative, longjmp support
 174                                    will be disabled.  */
 175   size_t jb_elt_size;           /* And the size of each entry in the buf.  */
 176
 177   /* Convention for returning structures.  */
 178   enum struct_return struct_return;
 179
 180   /* Cached core file helpers.  */
 181   struct regset *gregset, *fpregset;
 182 };
 183
 184
 185
 186 #ifndef LOWEST_PC
 187 #define LOWEST_PC (gdbarch_tdep (current_gdbarch)->lowest_pc)
 188 #endif
 189
 190 /* Functions exported from armbsd-tdep.h.  */
 191
 192 /* Return the appropriate register set for the core section identified
 193    by SECT_NAME and SECT_SIZE.  */
 194
 195 extern const struct regset *
 196   armbsd_regset_from_core_section (struct gdbarch *gdbarch,
 197                                    const char *sect_name, size_t sect_size);
 198
 199 #endif /* arm-tdep.h */