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 struct reggroup;
  26 struct gdbarch;
  27 struct frame_info;
  28
  29 /* GDB's i386 target supports both the 32-bit Intel Architecture
  30    (IA-32) and the 64-bit AMD x86-64 architecture.  Internally it uses
  31    a similar register layout for both.
  32
  33    - General purpose registers
  34    - FPU data registers
  35    - FPU control registers
  36    - SSE data registers
  37    - SSE control register
  38
  39    The general purpose registers for the x86-64 architecture are quite
  40    different from IA-32.  Therefore, the FP0_REGNUM target macro
  41    determines the register number at which the FPU data registers
  42    start.  The number of FPU data and control registers is the same
  43    for both architectures.  The number of SSE registers however,
  44    differs and is determined by the num_xmm_regs member of `struct
  45    gdbarch_tdep'.  */
  46
  47 /* Convention for returning structures.  */
  48
  49 enum struct_return
  50 {
  51   pcc_struct_return,            /* Return "short" structures in memory.  */
  52   reg_struct_return             /* Return "short" structures in registers.  */
  53 };
  54
  55 /* i386 architecture specific information.  */
  56 struct gdbarch_tdep
  57 {
  58   /* Number of SSE registers.  */
  59   int num_xmm_regs;
  60
  61   /* Offset of saved PC in jmp_buf.  */
  62   int jb_pc_offset;
  63
  64   /* Convention for returning structures.  */
  65   enum struct_return struct_return;
  66
  67   /* Address range where sigtramp lives.  */
  68   CORE_ADDR sigtramp_start;
  69   CORE_ADDR sigtramp_end;
  70
  71   /* Get address of sigcontext for sigtramp.  */
  72   CORE_ADDR (*sigcontext_addr) (struct frame_info *);
  73
  74   /* Offset of registers in `struct sigcontext'.  */
  75   int *sc_reg_offset;
  76   int sc_num_regs;
  77
  78   /* Offset of saved PC and SP in `struct sigcontext'.  Usage of these
  79      is deprecated, please use `sc_reg_offset' instead.  */
  80   int sc_pc_offset;
  81   int sc_sp_offset;
  82 };
  83
  84 /* Floating-point registers.  */
  85
  86 #define FPU_REG_RAW_SIZE 10
  87
  88 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
  89    (at most) in the FPU, but are zero-extended to 32 bits in GDB's
  90    register cache.  */
  91
  92 /* "Generic" floating point control register.  */
  93 #define FPC_REGNUM      (FP0_REGNUM + 8)
  94
  95 /* FPU control word.  */
  96 #define FCTRL_REGNUM    FPC_REGNUM
  97
  98 /* FPU status word.  */
  99 #define FSTAT_REGNUM    (FPC_REGNUM + 1)
 100
 101 /* FPU register tag word.  */
 102 #define FTAG_REGNUM     (FPC_REGNUM + 2)
 103
 104 /* FPU instruction's code segment selector, called "FPU Instruction
 105    Pointer Selector" in the IA-32 manuals.  */
 106 #define FISEG_REGNUM    (FPC_REGNUM + 3)
 107
 108 /* FPU instruction's offset within segment.  */
 109 #define FIOFF_REGNUM    (FPC_REGNUM + 4)
 110
 111 /* FPU operand's data segment.  */
 112 #define FOSEG_REGNUM    (FPC_REGNUM + 5)
 113
 114 /* FPU operand's offset within segment */
 115 #define FOOFF_REGNUM    (FPC_REGNUM + 6)
 116
 117 /* FPU opcode, bottom eleven bits.  */
 118 #define FOP_REGNUM      (FPC_REGNUM + 7)
 119
 120 /* Return non-zero if REGNUM matches the FP register and the FP
 121    register set is active.  */
 122 extern int i386_fp_regnum_p (int regnum);
 123 extern int i386_fpc_regnum_p (int regnum);
 124
 125 /* SSE registers.  */
 126
 127 /* First SSE data register.  */
 128 #define XMM0_REGNUM     (FPC_REGNUM + 8)
 129
 130 /* SSE control/status register.  */
 131 #define MXCSR_REGNUM \
 132   (XMM0_REGNUM + gdbarch_tdep (current_gdbarch)->num_xmm_regs)
 133
 134 /* Return non-zero if REGNUM matches the SSE register and the SSE
 135    register set is active.  */
 136 extern int i386_sse_regnum_p (int regnum);
 137 extern int i386_mxcsr_regnum_p (int regnum);
 138
 139 /* FIXME: kettenis/2001-11-24: Obsolete macro's.  */
 140 #define FCS_REGNUM FISEG_REGNUM
 141 #define FCOFF_REGNUM FIOFF_REGNUM
 142 #define FDS_REGNUM FOSEG_REGNUM
 143 #define FDOFF_REGNUM FOOFF_REGNUM
 144
 145 /* Register numbers of various important registers.  */
 146
 147 #define I386_EAX_REGNUM         0 /* %eax */
 148 #define I386_EDX_REGNUM         2 /* %edx */
 149 #define I386_ESP_REGNUM         4 /* %esp */
 150 #define I386_EBP_REGNUM         5 /* %ebp */
 151 #define I386_EIP_REGNUM         8 /* %eip */
 152 #define I386_EFLAGS_REGNUM      9 /* %eflags */
 153 #define I386_ST0_REGNUM         16 /* %st(0) */
 154
 155 #define I386_NUM_GREGS  16
 156 #define I386_NUM_FREGS  16
 157 #define I386_NUM_XREGS  9
 158
 159 #define I386_SSE_NUM_REGS       (I386_NUM_GREGS + I386_NUM_FREGS \
 160                                  + I386_NUM_XREGS)
 161
 162 /* Size of the largest register.  */
 163 #define I386_MAX_REGISTER_SIZE  16
 164
 165 /* Functions exported from i386-tdep.c.  */
 166 extern CORE_ADDR i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name);
 167 extern int i386_frameless_signal_p (struct frame_info *frame);
 168
 169 /* Return the name of register REG.  */
 170 extern char const *i386_register_name (int reg);
 171
 172 /* Return non-zero if REGNUM is a member of the specified group.  */
 173 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 174                                      struct reggroup *group);
 175
 176 /* Initialize a basic ELF architecture variant.  */
 177 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
 178
 179 /* Initialize a SVR4 architecture variant.  */
 180 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 181
 182 /* Functions exported from i386bsd-tdep.c.  */
 183
 184 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
 185
 186 #endif /* i386-tdep.h */