gdb/i386-tdep.h

   1 /* Target-dependent code for the i386.
   2
   3    Copyright (C) 2001, 2002, 2003, 2004, 2006
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 #ifndef I386_TDEP_H
  24 #define I386_TDEP_H
  25
  26 struct frame_info;
  27 struct gdbarch;
  28 struct reggroup;
  29 struct regset;
  30 struct regcache;
  31
  32 /* GDB's i386 target supports both the 32-bit Intel Architecture
  33    (IA-32) and the 64-bit AMD x86-64 architecture.  Internally it uses
  34    a similar register layout for both.
  35
  36    - General purpose registers
  37    - FPU data registers
  38    - FPU control registers
  39    - SSE data registers
  40    - SSE control register
  41
  42    The general purpose registers for the x86-64 architecture are quite
  43    different from IA-32.  Therefore, the FP0_REGNUM target macro
  44    determines the register number at which the FPU data registers
  45    start.  The number of FPU data and control registers is the same
  46    for both architectures.  The number of SSE registers however,
  47    differs and is determined by the num_xmm_regs member of `struct
  48    gdbarch_tdep'.  */
  49
  50 /* Convention for returning structures.  */
  51
  52 enum struct_return
  53 {
  54   pcc_struct_return,            /* Return "short" structures in memory.  */
  55   reg_struct_return             /* Return "short" structures in registers.  */
  56 };
  57
  58 /* i386 architecture specific information.  */
  59 struct gdbarch_tdep
  60 {
  61   /* General-purpose registers.  */
  62   struct regset *gregset;
  63   int *gregset_reg_offset;
  64   int gregset_num_regs;
  65   size_t sizeof_gregset;
  66
  67   /* Floating-point registers.  */
  68   struct regset *fpregset;
  69   size_t sizeof_fpregset;
  70
  71   /* Register number for %st(0).  The register numbers for the other
  72      registers follow from this one.  Set this to -1 to indicate the
  73      absence of an FPU.  */
  74   int st0_regnum;
  75
  76   /* Register number for %mm0.  Set this to -1 to indicate the absence
  77      of MMX support.  */
  78   int mm0_regnum;
  79
  80   /* Number of SSE registers.  */
  81   int num_xmm_regs;
  82
  83   /* Offset of saved PC in jmp_buf.  */
  84   int jb_pc_offset;
  85
  86   /* Convention for returning structures.  */
  87   enum struct_return struct_return;
  88
  89   /* Address range where sigtramp lives.  */
  90   CORE_ADDR sigtramp_start;
  91   CORE_ADDR sigtramp_end;
  92
  93   /* Detect sigtramp.  */
  94   int (*sigtramp_p) (struct frame_info *);
  95
  96   /* Get address of sigcontext for sigtramp.  */
  97   CORE_ADDR (*sigcontext_addr) (struct frame_info *);
  98
  99   /* Offset of registers in `struct sigcontext'.  */
 100   int *sc_reg_offset;
 101   int sc_num_regs;
 102
 103   /* Offset of saved PC and SP in `struct sigcontext'.  Usage of these
 104      is deprecated, please use `sc_reg_offset' instead.  */
 105   int sc_pc_offset;
 106   int sc_sp_offset;
 107 };
 108
 109 /* Floating-point registers.  */
 110
 111 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
 112    (at most) in the FPU, but are zero-extended to 32 bits in GDB's
 113    register cache.  */
 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 /* Register numbers of various important registers.  */
 121
 122 enum i386_regnum
 123 {
 124   I386_EAX_REGNUM,              /* %eax */
 125   I386_ECX_REGNUM,              /* %ecx */
 126   I386_EDX_REGNUM,              /* %edx */
 127   I386_EBX_REGNUM,              /* %ebx */
 128   I386_ESP_REGNUM,              /* %esp */
 129   I386_EBP_REGNUM,              /* %ebp */
 130   I386_ESI_REGNUM,              /* %esi */
 131   I386_EDI_REGNUM,              /* %edi */
 132   I386_EIP_REGNUM,              /* %eip */
 133   I386_EFLAGS_REGNUM,           /* %eflags */
 134   I386_CS_REGNUM,               /* %cs */
 135   I386_SS_REGNUM,               /* %ss */
 136   I386_DS_REGNUM,               /* %ds */
 137   I386_ES_REGNUM,               /* %es */
 138   I386_FS_REGNUM,               /* %fs */
 139   I386_GS_REGNUM,               /* %gs */
 140   I386_ST0_REGNUM               /* %st(0) */
 141 };
 142
 143 #define I386_NUM_GREGS  16
 144 #define I386_NUM_FREGS  16
 145 #define I386_NUM_XREGS  9
 146
 147 #define I386_SSE_NUM_REGS       (I386_NUM_GREGS + I386_NUM_FREGS \
 148                                  + I386_NUM_XREGS)
 149
 150 /* Size of the largest register.  */
 151 #define I386_MAX_REGISTER_SIZE  16
 152
 153 /* Types for i386-specific registers.  */
 154 extern struct type *i386_eflags_type;
 155 extern struct type *i386_mmx_type;
 156 extern struct type *i386_sse_type;
 157 extern struct type *i386_mxcsr_type;
 158
 159 /* Segment selectors.  */
 160 #define I386_SEL_RPL    0x0003  /* Requester's Privilege Level mask.  */
 161 #define I386_SEL_UPL    0x0003  /* User Privilige Level. */
 162 #define I386_SEL_KPL    0x0000  /* Kernel Privilige Level. */
 163
 164 /* Functions exported from i386-tdep.c.  */
 165 extern CORE_ADDR i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name);
 166
 167 /* Return the name of register REGNUM.  */
 168 extern char const *i386_register_name (int regnum);
 169
 170 /* Return non-zero if REGNUM is a member of the specified group.  */
 171 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 172                                      struct reggroup *group);
 173
 174 /* Supply register REGNUM from the general-purpose register set REGSET
 175    to register cache REGCACHE.  If REGNUM is -1, do this for all
 176    registers in REGSET.  */
 177 extern void i386_supply_gregset (const struct regset *regset,
 178                                  struct regcache *regcache, int regnum,
 179                                  const void *gregs, size_t len);
 180
 181 /* Collect register REGNUM from the register cache REGCACHE and store
 182    it in the buffer specified by GREGS and LEN as described by the
 183    general-purpose register set REGSET.  If REGNUM is -1, do this for
 184    all registers in REGSET.  */
 185 extern void i386_collect_gregset (const struct regset *regset,
 186                                   const struct regcache *regcache,
 187                                   int regnum, void *gregs, size_t len);
 188
 189 /* Return the appropriate register set for the core section identified
 190    by SECT_NAME and SECT_SIZE.  */
 191 extern const struct regset *
 192   i386_regset_from_core_section (struct gdbarch *gdbarch,
 193                                  const char *sect_name, size_t sect_size);
 194
 195 /* Initialize a basic ELF architecture variant.  */
 196 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
 197
 198 /* Initialize a SVR4 architecture variant.  */
 199 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 200 \f
 201
 202 /* Functions and variables exported from i386bsd-tdep.c.  */
 203
 204 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
 205 extern CORE_ADDR i386fbsd_sigtramp_start_addr;
 206 extern CORE_ADDR i386fbsd_sigtramp_end_addr;
 207 extern CORE_ADDR i386obsd_sigtramp_start_addr;
 208 extern CORE_ADDR i386obsd_sigtramp_end_addr;
 209 extern int i386fbsd4_sc_reg_offset[];
 210 extern int i386fbsd_sc_reg_offset[];
 211 extern int i386nbsd_sc_reg_offset[];
 212 extern int i386obsd_sc_reg_offset[];
 213 extern int i386bsd_sc_reg_offset[];
 214
 215 #endif /* i386-tdep.h */