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 saved PC and SP in `struct sigcontext'.  */
  75   int sc_pc_offset;
  76   int sc_sp_offset;
  77 };
  78
  79 /* Floating-point registers.  */
  80
  81 #define FPU_REG_RAW_SIZE 10
  82
  83 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
  84    (at most) in the FPU, but are zero-extended to 32 bits in GDB's
  85    register cache.  */
  86
  87 /* "Generic" floating point control register.  */
  88 #define FPC_REGNUM      (FP0_REGNUM + 8)
  89
  90 /* FPU control word.  */
  91 #define FCTRL_REGNUM    FPC_REGNUM
  92
  93 /* FPU status word.  */
  94 #define FSTAT_REGNUM    (FPC_REGNUM + 1)
  95
  96 /* FPU register tag word.  */
  97 #define FTAG_REGNUM     (FPC_REGNUM + 2)
  98
  99 /* FPU instruction's code segment selector, called "FPU Instruction
 100    Pointer Selector" in the IA-32 manuals.  */
 101 #define FISEG_REGNUM    (FPC_REGNUM + 3)
 102
 103 /* FPU instruction's offset within segment.  */
 104 #define FIOFF_REGNUM    (FPC_REGNUM + 4)
 105
 106 /* FPU operand's data segment.  */
 107 #define FOSEG_REGNUM    (FPC_REGNUM + 5)
 108
 109 /* FPU operand's offset within segment */
 110 #define FOOFF_REGNUM    (FPC_REGNUM + 6)
 111
 112 /* FPU opcode, bottom eleven bits.  */
 113 #define FOP_REGNUM      (FPC_REGNUM + 7)
 114
 115 /* Return non-zero if REGNUM matches the FP register and the FP
 116    register set is active.  */
 117 extern int i386_fp_regnum_p (int regnum);
 118 extern int i386_fpc_regnum_p (int regnum);
 119
 120 /* SSE registers.  */
 121
 122 /* First SSE data register.  */
 123 #define XMM0_REGNUM     (FPC_REGNUM + 8)
 124
 125 /* SSE control/status register.  */
 126 #define MXCSR_REGNUM \
 127   (XMM0_REGNUM + gdbarch_tdep (current_gdbarch)->num_xmm_regs)
 128
 129 /* Return non-zero if REGNUM matches the SSE register and the SSE
 130    register set is active.  */
 131 extern int i386_sse_regnum_p (int regnum);
 132 extern int i386_mxcsr_regnum_p (int regnum);
 133
 134 /* FIXME: kettenis/2001-11-24: Obsolete macro's.  */
 135 #define FCS_REGNUM FISEG_REGNUM
 136 #define FCOFF_REGNUM FIOFF_REGNUM
 137 #define FDS_REGNUM FOSEG_REGNUM
 138 #define FDOFF_REGNUM FOOFF_REGNUM
 139 #define IS_FP_REGNUM(n) i386_fp_regnum_p (n)
 140 #define IS_SSE_REGNUM(n) i386_sse_regnum_p (n)
 141
 142 #define I386_NUM_GREGS  16
 143 #define I386_NUM_FREGS  16
 144 #define I386_NUM_XREGS  9
 145
 146 #define I386_SSE_NUM_REGS       (I386_NUM_GREGS + I386_NUM_FREGS \
 147                                  + I386_NUM_XREGS)
 148
 149 /* Sizes of individual register sets.  These cover the entire register
 150    file, so summing up the sizes of those portions actually present
 151    yields DEPRECATED_REGISTER_BYTES.  */
 152 #define I386_SIZEOF_GREGS       (I386_NUM_GREGS * 4)
 153 #define I386_SIZEOF_FREGS       (8 * 10 + 8 * 4)
 154 #define I386_SIZEOF_XREGS       (8 * 16 + 4)
 155
 156 #define I386_SSE_SIZEOF_REGS    (I386_SIZEOF_GREGS + I386_SIZEOF_FREGS \
 157                                  + I386_SIZEOF_XREGS)
 158
 159 /* Size of the largest register.  */
 160 #define I386_MAX_REGISTER_SIZE  16
 161
 162 /* Functions exported from i386-tdep.c.  */
 163 extern CORE_ADDR i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name);
 164 extern int i386_frameless_signal_p (struct frame_info *frame);
 165
 166 /* Return the name of register REG.  */
 167 extern char const *i386_register_name (int reg);
 168
 169 /* Return non-zero if REGNUM is a member of the specified group.  */
 170 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 171                                      struct reggroup *group);
 172
 173 /* Initialize a basic ELF architecture variant.  */
 174 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
 175
 176 /* Initialize a SVR4 architecture variant.  */
 177 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 178
 179 /* Functions exported from i386bsd-tdep.c.  */
 180
 181 extern CORE_ADDR i386bsd_sigcontext_addr (struct frame_info *frame);
 182 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
 183
 184 #endif /* i386-tdep.h */