gdb/i386-tdep.h

   1 /* Target-dependent code for the i386.
   2
   3    Copyright (C) 2001, 2002, 2003, 2004 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., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #ifndef I386_TDEP_H
  23 #define I386_TDEP_H
  24
  25 struct frame_info;
  26 struct gdbarch;
  27 struct reggroup;
  28 struct regset;
  29 struct regcache;
  30
  31 /* GDB's i386 target supports both the 32-bit Intel Architecture
  32    (IA-32) and the 64-bit AMD x86-64 architecture.  Internally it uses
  33    a similar register layout for both.
  34
  35    - General purpose registers
  36    - FPU data registers
  37    - FPU control registers
  38    - SSE data registers
  39    - SSE control register
  40
  41    The general purpose registers for the x86-64 architecture are quite
  42    different from IA-32.  Therefore, the FP0_REGNUM target macro
  43    determines the register number at which the FPU data registers
  44    start.  The number of FPU data and control registers is the same
  45    for both architectures.  The number of SSE registers however,
  46    differs and is determined by the num_xmm_regs member of `struct
  47    gdbarch_tdep'.  */
  48
  49 /* Convention for returning structures.  */
  50
  51 enum struct_return
  52 {
  53   pcc_struct_return,            /* Return "short" structures in memory.  */
  54   reg_struct_return             /* Return "short" structures in registers.  */
  55 };
  56
  57 /* i386 architecture specific information.  */
  58 struct gdbarch_tdep
  59 {
  60   /* General-purpose registers.  */
  61   struct regset *gregset;
  62   int *gregset_reg_offset;
  63   int gregset_num_regs;
  64   size_t sizeof_gregset;
  65
  66   /* Floating-point registers.  */
  67   struct regset *fpregset;
  68   size_t sizeof_fpregset;
  69
  70   /* Register number for %st(0).  The register numbers for the other
  71      registers follow from this one.  Set this to -1 to indicate the
  72      absence of an FPU.  */
  73   int st0_regnum;
  74
  75   /* Register number for %mm0.  Set this to -1 to indicate the absence
  76      of MMX support.  */
  77   int mm0_regnum;
  78
  79   /* Number of SSE registers.  */
  80   int num_xmm_regs;
  81
  82   /* Offset of saved PC in jmp_buf.  */
  83   int jb_pc_offset;
  84
  85   /* Convention for returning structures.  */
  86   enum struct_return struct_return;
  87
  88   /* Address range where sigtramp lives.  */
  89   CORE_ADDR sigtramp_start;
  90   CORE_ADDR sigtramp_end;
  91
  92   /* Detect sigtramp.  */
  93   int (*sigtramp_p) (struct frame_info *);
  94
  95   /* Get address of sigcontext for sigtramp.  */
  96   CORE_ADDR (*sigcontext_addr) (struct frame_info *);
  97
  98   /* Offset of registers in `struct sigcontext'.  */
  99   int *sc_reg_offset;
 100   int sc_num_regs;
 101
 102   /* Offset of saved PC and SP in `struct sigcontext'.  Usage of these
 103      is deprecated, please use `sc_reg_offset' instead.  */
 104   int sc_pc_offset;
 105   int sc_sp_offset;
 106 };
 107
 108 /* Floating-point registers.  */
 109
 110 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
 111    (at most) in the FPU, but are zero-extended to 32 bits in GDB's
 112    register cache.  */
 113
 114 /* Return non-zero if REGNUM matches the FP register and the FP
 115    register set is active.  */
 116 extern int i386_fp_regnum_p (int regnum);
 117 extern int i386_fpc_regnum_p (int regnum);
 118
 119 /* Register numbers of various important registers.  */
 120
 121 enum i386_regnum
 122 {
 123   I386_EAX_REGNUM,              /* %eax */
 124   I386_ECX_REGNUM,              /* %ecx */
 125   I386_EDX_REGNUM,              /* %edx */
 126   I386_EBX_REGNUM,              /* %ebx */
 127   I386_ESP_REGNUM,              /* %esp */
 128   I386_EBP_REGNUM,              /* %ebp */
 129   I386_ESI_REGNUM,              /* %esi */
 130   I386_EDI_REGNUM,              /* %edi */
 131   I386_EIP_REGNUM,              /* %eip */
 132   I386_EFLAGS_REGNUM,           /* %eflags */
 133   I386_CS_REGNUM,               /* %cs */
 134   I386_SS_REGNUM,               /* %ss */
 135   I386_DS_REGNUM,               /* %ds */
 136   I386_ES_REGNUM,               /* %es */
 137   I386_FS_REGNUM,               /* %fs */
 138   I386_GS_REGNUM,               /* %gs */
 139   I386_ST0_REGNUM               /* %st(0) */
 140 };
 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 /* Size of the largest register.  */
 150 #define I386_MAX_REGISTER_SIZE  16
 151
 152 /* Segment selectors.  */
 153 #define I386_SEL_RPL    0x0003  /* Requester's Privilege Level mask.  */
 154 #define I386_SEL_UPL    0x0003  /* User Privilige Level. */
 155 #define I386_SEL_KPL    0x0000  /* Kernel Privilige Level. */
 156
 157 /* Functions exported from i386-tdep.c.  */
 158 extern CORE_ADDR i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name);
 159
 160 /* Return the name of register REGNUM.  */
 161 extern char const *i386_register_name (int regnum);
 162
 163 /* Return non-zero if REGNUM is a member of the specified group.  */
 164 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 165                                      struct reggroup *group);
 166
 167 /* Supply register REGNUM from the general-purpose register set REGSET
 168    to register cache REGCACHE.  If REGNUM is -1, do this for all
 169    registers in REGSET.  */
 170 extern void i386_supply_gregset (const struct regset *regset,
 171                                  struct regcache *regcache, int regnum,
 172                                  const void *gregs, size_t len);
 173
 174 /* Collect register REGNUM from the register cache REGCACHE and store
 175    it in the buffer specified by GREGS and LEN as described by the
 176    general-purpose register set REGSET.  If REGNUM is -1, do this for
 177    all registers in REGSET.  */
 178 extern void i386_collect_gregset (const struct regset *regset,
 179                                   const struct regcache *regcache,
 180                                   int regnum, void *gregs, size_t len);
 181
 182 /* Return the appropriate register set for the core section identified
 183    by SECT_NAME and SECT_SIZE.  */
 184 extern const struct regset *
 185   i386_regset_from_core_section (struct gdbarch *gdbarch,
 186                                  const char *sect_name, size_t sect_size);
 187
 188 /* Initialize a basic ELF architecture variant.  */
 189 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
 190
 191 /* Initialize a SVR4 architecture variant.  */
 192 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 193 \f
 194
 195 /* Functions and variables exported from i386bsd-tdep.c.  */
 196
 197 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
 198 extern CORE_ADDR i386fbsd_sigtramp_start_addr;
 199 extern CORE_ADDR i386fbsd_sigtramp_end_addr;
 200 extern CORE_ADDR i386obsd_sigtramp_start_addr;
 201 extern CORE_ADDR i386obsd_sigtramp_end_addr;
 202 extern int i386fbsd4_sc_reg_offset[];
 203 extern int i386fbsd_sc_reg_offset[];
 204 extern int i386nbsd_sc_reg_offset[];
 205 extern int i386obsd_sc_reg_offset[];
 206 extern int i386bsd_sc_reg_offset[];
 207
 208 #endif /* i386-tdep.h */