gdb/i386-tdep.h

   1 /* Target-dependent code for GDB, the GNU debugger.
   2    Copyright 2001, 2002, 2003
   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 /* Convention for returning structures.  */
  44
  45 enum struct_return
  46 {
  47   pcc_struct_return,            /* Return "short" structures in memory.  */
  48   reg_struct_return             /* Return "short" structures in registers.  */
  49 };
  50
  51 /* i386 architecture specific information.  */
  52 struct gdbarch_tdep
  53 {
  54   /* Number of SSE registers.  */
  55   int num_xmm_regs;
  56
  57   /* Offset of saved PC in jmp_buf.  */
  58   int jb_pc_offset;
  59
  60   /* Convention for returning structures.  */
  61   enum struct_return struct_return;
  62
  63   /* Address range where sigtramp lives.  */
  64   CORE_ADDR sigtramp_start;
  65   CORE_ADDR sigtramp_end;
  66
  67   /* Get address of sigcontext for sigtramp.  */
  68   CORE_ADDR (*sigcontext_addr) (struct frame_info *);
  69
  70   /* Offset of saved PC and SP in `struct sigcontext'.  */
  71   int sc_pc_offset;
  72   int sc_sp_offset;
  73 };
  74
  75 /* Floating-point registers.  */
  76
  77 #define FPU_REG_RAW_SIZE 10
  78
  79 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
  80    (at most) in the FPU, but are zero-extended to 32 bits in GDB's
  81    register cache.  */
  82
  83 /* "Generic" floating point control register.  */
  84 #define FPC_REGNUM      (FP0_REGNUM + 8)
  85
  86 /* FPU control word.  */
  87 #define FCTRL_REGNUM    FPC_REGNUM
  88
  89 /* FPU status word.  */
  90 #define FSTAT_REGNUM    (FPC_REGNUM + 1)
  91
  92 /* FPU register tag word.  */
  93 #define FTAG_REGNUM     (FPC_REGNUM + 2)
  94
  95 /* FPU instruction's code segment selector, called "FPU Instruction
  96    Pointer Selector" in the IA-32 manuals.  */
  97 #define FISEG_REGNUM    (FPC_REGNUM + 3)
  98
  99 /* FPU instruction's offset within segment.  */
 100 #define FIOFF_REGNUM    (FPC_REGNUM + 4)
 101
 102 /* FPU operand's data segment.  */
 103 #define FOSEG_REGNUM    (FPC_REGNUM + 5)
 104
 105 /* FPU operand's offset within segment */
 106 #define FOOFF_REGNUM    (FPC_REGNUM + 6)
 107
 108 /* FPU opcode, bottom eleven bits.  */
 109 #define FOP_REGNUM      (FPC_REGNUM + 7)
 110
 111 /* Return non-zero if REGNUM matches the FP register and the FP
 112    register set is active.  */
 113 extern int i386_fp_regnum_p (int regnum);
 114 extern int i386_fpc_regnum_p (int regnum);
 115
 116 /* SSE registers.  */
 117
 118 /* First SSE data register.  */
 119 #define XMM0_REGNUM     (FPC_REGNUM + 8)
 120
 121 /* SSE control/status register.  */
 122 #define MXCSR_REGNUM \
 123   (XMM0_REGNUM + gdbarch_tdep (current_gdbarch)->num_xmm_regs)
 124
 125 /* Return non-zero if REGNUM matches the SSE register and the SSE
 126    register set is active.  */
 127 extern int i386_sse_regnum_p (int regnum);
 128 extern int i386_mxcsr_regnum_p (int regnum);
 129
 130 /* FIXME: kettenis/2001-11-24: Obsolete macro's.  */
 131 #define FCS_REGNUM FISEG_REGNUM
 132 #define FCOFF_REGNUM FIOFF_REGNUM
 133 #define FDS_REGNUM FOSEG_REGNUM
 134 #define FDOFF_REGNUM FOOFF_REGNUM
 135 #define IS_FP_REGNUM(n) i386_fp_regnum_p (n)
 136 #define IS_SSE_REGNUM(n) i386_sse_regnum_p (n)
 137
 138 #define I386_NUM_GREGS  16
 139 #define I386_NUM_FREGS  16
 140 #define I386_NUM_XREGS  9
 141
 142 #define I386_SSE_NUM_REGS       (I386_NUM_GREGS + I386_NUM_FREGS \
 143                                  + I386_NUM_XREGS)
 144
 145 /* Sizes of individual register sets.  These cover the entire register
 146    file, so summing up the sizes of those portions actually present
 147    yields REGISTER_BYTES.  */
 148 #define I386_SIZEOF_GREGS       (I386_NUM_GREGS * 4)
 149 #define I386_SIZEOF_FREGS       (8 * 10 + 8 * 4)
 150 #define I386_SIZEOF_XREGS       (8 * 16 + 4)
 151
 152 #define I386_SSE_SIZEOF_REGS    (I386_SIZEOF_GREGS + I386_SIZEOF_FREGS \
 153                                  + I386_SIZEOF_XREGS)
 154
 155 /* Size of the largest register.  */
 156 #define I386_MAX_REGISTER_SIZE  16
 157
 158 /* Functions exported from i386-tdep.c.  */
 159 extern CORE_ADDR i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name);
 160 extern int i386_frameless_signal_p (struct frame_info *frame);
 161
 162 /* Return the name of register REG.  */
 163 extern char const *i386_register_name (int reg);
 164
 165 /* Return non-zero if REGNUM is a member of the specified group.  */
 166 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 167                                      struct reggroup *group);
 168
 169 /* Initialize a basic ELF architecture variant.  */
 170 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
 171
 172 /* Initialize a SVR4 architecture variant.  */
 173 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 174
 175 /* Functions exported from i386bsd-tdep.c.  */
 176
 177 extern CORE_ADDR i386bsd_sigcontext_addr (struct frame_info *frame);
 178 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
 179
 180 #endif /* i386-tdep.h */