gdb/i386-tdep.h

   1 /* Target-dependent code for GDB, the GNU debugger.
   2    Copyright 2001
   3    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 I386_TDEP_H
  23 #define I386_TDEP_H
  24
  25 /* GDB's i386 target supports both the 32-bit Intel Architecture
  26    (IA-32) and the 64-bit AMD x86-64 architecture.  Internally it uses
  27    a similar register layout for both.
  28
  29    - General purpose registers
  30    - FPU data registers
  31    - FPU control registers
  32    - SSE data registers
  33    - SSE control register
  34
  35    The general purpose registers for the x86-64 architecture are quite
  36    different from IA-32.  Therefore, the FP0_REGNUM target macro
  37    determines the register number at which the FPU data registers
  38    start.  The number of FPU data and control registers is the same
  39    for both architectures.  The number of SSE registers however,
  40    differs and is determined by the num_xmm_regs member of `struct
  41    gdbarch_tdep'.  */
  42
  43 /* ABI variants that we know about.  */
  44 enum i386_abi
  45 {
  46   I386_ABI_UNKNOWN = 0,
  47
  48   /* ELF */
  49   I386_ABI_SVR4,                /* This is the default.  */
  50   I386_ABI_NETBSD,
  51   I386_ABI_LINUX,
  52   I386_ABI_HURD,
  53   I386_ABI_SOLARIS,
  54   I386_ABI_FREEBSD,
  55
  56   I386_ABI_INVALID = -1
  57 };
  58
  59 /* i386 architecture specific information.  */
  60 struct gdbarch_tdep
  61 {
  62   /* ABI.  */
  63   enum i386_abi abi;
  64
  65   /* Number of SSE registers.  */
  66   int num_xmm_regs;
  67 };
  68
  69 /* Floating-point registers.  */
  70
  71 #define FPU_REG_RAW_SIZE 10
  72
  73 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
  74    (at most) in the FPU, but are zero-extended to 32 bits in GDB's
  75    register cache.  */
  76
  77 /* "Generic" floating point control register.  */
  78 #define FPC_REGNUM      (FP0_REGNUM + 8)
  79
  80 /* FPU control word.  */
  81 #define FCTRL_REGNUM    FPC_REGNUM
  82
  83 /* FPU status word.  */
  84 #define FSTAT_REGNUM    (FPC_REGNUM + 1)
  85
  86 /* FPU register tag word.  */
  87 #define FTAG_REGNUM     (FPC_REGNUM + 2)
  88
  89 /* FPU instruction's code segment selector, called "FPU Instruction
  90    Pointer Selector" in the IA-32 manuals.  */
  91 #define FISEG_REGNUM    (FPC_REGNUM + 3)
  92
  93 /* FPU instruction's offset within segment.  */
  94 #define FIOFF_REGNUM    (FPC_REGNUM + 4)
  95
  96 /* FPU operand's data segment.  */
  97 #define FOSEG_REGNUM    (FPC_REGNUM + 5)
  98
  99 /* FPU operand's offset within segment */
 100 #define FOOFF_REGNUM    (FPC_REGNUM + 6)
 101
 102 /* FPU opcode, bottom eleven bits.  */
 103 #define FOP_REGNUM      (FPC_REGNUM + 7)
 104
 105 /* Return non-zero if N corresponds to a FPU data registers.  */
 106 #define FP_REGNUM_P(n)  (FP0_REGNUM <= (n) && (n) < FPC_REGNUM)
 107
 108 /* Return non-zero if N corresponds to a FPU control register.  */
 109 #define FPC_REGNUM_P(n) (FPC_REGNUM <= (n) && (n) < XMM0_REGNUM)
 110
 111 /* SSE registers.  */
 112
 113 /* First SSE data register.  */
 114 #define XMM0_REGNUM     (FPC_REGNUM + 8)
 115
 116 /* SSE control/status register.  */
 117 #define MXCSR_REGNUM \
 118   (XMM0_REGNUM + gdbarch_tdep (current_gdbarch)->num_xmm_regs)
 119
 120 /* Return non-zero if N corresponds to a SSE data register.  */
 121 #define SSE_REGNUM_P(n) (XMM0_REGNUM <= (n) && (n) < MXCSR_REGNUM)
 122
 123 /* FIXME: kettenis/2001-11-24: Obsolete macro's.  */
 124 #define FCS_REGNUM FISEG_REGNUM
 125 #define FCOFF_REGNUM FIOFF_REGNUM
 126 #define FDS_REGNUM FOSEG_REGNUM
 127 #define FDOFF_REGNUM FOOFF_REGNUM
 128 #define IS_FP_REGNUM(n) FP_REGNUM_P (n)
 129 #define IS_FPU_CTRL_REGNUM(n) FPC_REGNUM_P (n)
 130 #define IS_SSE_REGNUM(n) SSE_REGNUM_P (n)
 131
 132 void i386_gdbarch_register_os_abi (enum i386_abi,
 133                                    void (*init_abi)(struct gdbarch_info,
 134                                                     struct gdbarch *));
 135
 136 #endif /* i386-tdep.h */