gdb/i386-tdep.h

   1 /* Target-dependent code for the i386.
   2
   3    Copyright (C) 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009
   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 3 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, see <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef I386_TDEP_H
  22 #define I386_TDEP_H
  23
  24 struct frame_info;
  25 struct gdbarch;
  26 struct reggroup;
  27 struct regset;
  28 struct regcache;
  29
  30 /* GDB's i386 target supports both the 32-bit Intel Architecture
  31    (IA-32) and the 64-bit AMD x86-64 architecture.  Internally it uses
  32    a similar register layout for both.
  33
  34    - General purpose registers
  35    - FPU data registers
  36    - FPU control registers
  37    - SSE data registers
  38    - SSE control register
  39
  40    The general purpose registers for the x86-64 architecture are quite
  41    different from IA-32.  Therefore, gdbarch_fp0_regnum
  42    determines the register number at which the FPU data registers
  43    start.  The number of FPU data and control registers is the same
  44    for both architectures.  The number of SSE registers however,
  45    differs and is determined by the num_xmm_regs member of `struct
  46    gdbarch_tdep'.  */
  47
  48 /* Convention for returning structures.  */
  49
  50 enum struct_return
  51 {
  52   pcc_struct_return,            /* Return "short" structures in memory.  */
  53   reg_struct_return             /* Return "short" structures in registers.  */
  54 };
  55
  56 /* i386 architecture specific information.  */
  57 struct gdbarch_tdep
  58 {
  59   /* General-purpose registers.  */
  60   struct regset *gregset;
  61   int *gregset_reg_offset;
  62   int gregset_num_regs;
  63   size_t sizeof_gregset;
  64
  65   /* Floating-point registers.  */
  66   struct regset *fpregset;
  67   size_t sizeof_fpregset;
  68
  69   /* Register number for %st(0).  The register numbers for the other
  70      registers follow from this one.  Set this to -1 to indicate the
  71      absence of an FPU.  */
  72   int st0_regnum;
  73
  74   /* Register number for %mm0.  Set this to -1 to indicate the absence
  75      of MMX support.  */
  76   int mm0_regnum;
  77
  78   /* Number of SSE registers.  */
  79   int num_xmm_regs;
  80
  81   /* Offset of saved PC in jmp_buf.  */
  82   int jb_pc_offset;
  83
  84   /* Convention for returning structures.  */
  85   enum struct_return struct_return;
  86
  87   /* Address range where sigtramp lives.  */
  88   CORE_ADDR sigtramp_start;
  89   CORE_ADDR sigtramp_end;
  90
  91   /* Detect sigtramp.  */
  92   int (*sigtramp_p) (struct frame_info *);
  93
  94   /* Get address of sigcontext for sigtramp.  */
  95   CORE_ADDR (*sigcontext_addr) (struct frame_info *);
  96
  97   /* Offset of registers in `struct sigcontext'.  */
  98   int *sc_reg_offset;
  99   int sc_num_regs;
 100
 101   /* Offset of saved PC and SP in `struct sigcontext'.  Usage of these
 102      is deprecated, please use `sc_reg_offset' instead.  */
 103   int sc_pc_offset;
 104   int sc_sp_offset;
 105
 106   /* ISA-specific data types.  */
 107   struct type *i386_mmx_type;
 108   struct type *i386_sse_type;
 109 };
 110
 111 /* Floating-point registers.  */
 112
 113 /* All FPU control regusters (except for FIOFF and FOOFF) are 16-bit
 114    (at most) in the FPU, but are zero-extended to 32 bits in GDB's
 115    register cache.  */
 116
 117 /* Return non-zero if REGNUM matches the FP register and the FP
 118    register set is active.  */
 119 extern int i386_fp_regnum_p (struct gdbarch *, int);
 120 extern int i386_fpc_regnum_p (struct gdbarch *, int);
 121
 122 /* Register numbers of various important registers.  */
 123
 124 enum i386_regnum
 125 {
 126   I386_EAX_REGNUM,              /* %eax */
 127   I386_ECX_REGNUM,              /* %ecx */
 128   I386_EDX_REGNUM,              /* %edx */
 129   I386_EBX_REGNUM,              /* %ebx */
 130   I386_ESP_REGNUM,              /* %esp */
 131   I386_EBP_REGNUM,              /* %ebp */
 132   I386_ESI_REGNUM,              /* %esi */
 133   I386_EDI_REGNUM,              /* %edi */
 134   I386_EIP_REGNUM,              /* %eip */
 135   I386_EFLAGS_REGNUM,           /* %eflags */
 136   I386_CS_REGNUM,               /* %cs */
 137   I386_SS_REGNUM,               /* %ss */
 138   I386_DS_REGNUM,               /* %ds */
 139   I386_ES_REGNUM,               /* %es */
 140   I386_FS_REGNUM,               /* %fs */
 141   I386_GS_REGNUM,               /* %gs */
 142   I386_ST0_REGNUM               /* %st(0) */
 143 };
 144
 145 #define I386_NUM_GREGS  16
 146 #define I386_NUM_FREGS  16
 147 #define I386_NUM_XREGS  9
 148
 149 #define I386_SSE_NUM_REGS       (I386_NUM_GREGS + I386_NUM_FREGS \
 150                                  + I386_NUM_XREGS)
 151
 152 /* Size of the largest register.  */
 153 #define I386_MAX_REGISTER_SIZE  16
 154
 155 /* Types for i386-specific registers.  */
 156 extern struct type *i386_eflags_type;
 157 extern struct type *i386_mxcsr_type;
 158
 159 extern struct type *i386_mmx_type (struct gdbarch *gdbarch);
 160 extern struct type *i386_sse_type (struct gdbarch *gdbarch);
 161
 162 /* Segment selectors.  */
 163 #define I386_SEL_RPL    0x0003  /* Requester's Privilege Level mask.  */
 164 #define I386_SEL_UPL    0x0003  /* User Privilige Level. */
 165 #define I386_SEL_KPL    0x0000  /* Kernel Privilige Level. */
 166
 167 /* The length of the longest i386 instruction (according to
 168    include/asm-i386/kprobes.h in Linux 2.6.  */
 169 #define I386_MAX_INSN_LEN (16)
 170
 171 /* Functions exported from i386-tdep.c.  */
 172 extern CORE_ADDR i386_pe_skip_trampoline_code (CORE_ADDR pc, char *name);
 173 extern CORE_ADDR i386_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc);
 174
 175 /* Return the name of register REGNUM.  */
 176 extern char const *i386_register_name (struct gdbarch * gdbarch, int regnum);
 177
 178 /* Return non-zero if REGNUM is a member of the specified group.  */
 179 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 180                                      struct reggroup *group);
 181
 182 /* Supply register REGNUM from the general-purpose register set REGSET
 183    to register cache REGCACHE.  If REGNUM is -1, do this for all
 184    registers in REGSET.  */
 185 extern void i386_supply_gregset (const struct regset *regset,
 186                                  struct regcache *regcache, int regnum,
 187                                  const void *gregs, size_t len);
 188
 189 /* Collect register REGNUM from the register cache REGCACHE and store
 190    it in the buffer specified by GREGS and LEN as described by the
 191    general-purpose register set REGSET.  If REGNUM is -1, do this for
 192    all registers in REGSET.  */
 193 extern void i386_collect_gregset (const struct regset *regset,
 194                                   const struct regcache *regcache,
 195                                   int regnum, void *gregs, size_t len);
 196
 197 /* Return the appropriate register set for the core section identified
 198    by SECT_NAME and SECT_SIZE.  */
 199 extern const struct regset *
 200   i386_regset_from_core_section (struct gdbarch *gdbarch,
 201                                  const char *sect_name, size_t sect_size);
 202
 203
 204 extern void i386_displaced_step_fixup (struct gdbarch *gdbarch,
 205                                        struct displaced_step_closure *closure,
 206                                        CORE_ADDR from, CORE_ADDR to,
 207                                        struct regcache *regs);
 208
 209 /* Initialize a basic ELF architecture variant.  */
 210 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
 211
 212 /* Initialize a SVR4 architecture variant.  */
 213 extern void i386_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 214 \f
 215
 216 /* Functions and variables exported from i386bsd-tdep.c.  */
 217
 218 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);
 219 extern CORE_ADDR i386fbsd_sigtramp_start_addr;
 220 extern CORE_ADDR i386fbsd_sigtramp_end_addr;
 221 extern CORE_ADDR i386obsd_sigtramp_start_addr;
 222 extern CORE_ADDR i386obsd_sigtramp_end_addr;
 223 extern int i386fbsd4_sc_reg_offset[];
 224 extern int i386fbsd_sc_reg_offset[];
 225 extern int i386nbsd_sc_reg_offset[];
 226 extern int i386obsd_sc_reg_offset[];
 227 extern int i386bsd_sc_reg_offset[];
 228
 229 #endif /* i386-tdep.h */