gdb/xtensa-tdep.h

   1 /* Target-dependent code for the Xtensa port of GDB, the GNU debugger.
   2
   3    Copyright (C) 2003, 2005, 2006, 2007 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
  23 /* XTENSA_TDEP_VERSION can/should be changed along with XTENSA_CONFIG_VERSION
  24    whenever the "tdep" structure changes in an incompatible way.  */
  25
  26 #define XTENSA_TDEP_VERSION 0x60
  27
  28 /*  Xtensa register type.  */
  29
  30 typedef enum
  31 {
  32   xtRegisterTypeArRegfile = 1,  /* Register File ar0..arXX.  */
  33   xtRegisterTypeSpecialReg,     /* CPU states, such as PS, Booleans, (rsr).  */
  34   xtRegisterTypeUserReg,        /* User defined registers (rur).  */
  35   xtRegisterTypeTieRegfile,     /* User define register files.  */
  36   xtRegisterTypeTieState,       /* TIE States (mapped on user regs).  */
  37   xtRegisterTypeMapped,         /* Mapped on Special Registers.  */
  38   xtRegisterTypeUnmapped,       /* Special case of masked registers.  */
  39   xtRegisterTypeWindow,         /* Live window registers (a0..a15).  */
  40   xtRegisterTypeVirtual,        /* PC, FP.  */
  41   xtRegisterTypeUnknown
  42 } xtensa_register_type_t;
  43
  44
  45 /*  Xtensa register group.  */
  46
  47 typedef enum
  48 {
  49   xtRegisterGroupUnknown = 0,
  50   xtRegisterGroupRegFile        = 0x0001,    /* Register files without ARx.  */
  51   xtRegisterGroupAddrReg        = 0x0002,    /* ARx.  */
  52   xtRegisterGroupSpecialReg     = 0x0004,    /* SRxx.  */
  53   xtRegisterGroupUserReg        = 0x0008,    /* URxx.  */
  54   xtRegisterGroupState          = 0x0010,    /* States.  */
  55
  56   xtRegisterGroupGeneral        = 0x0100,    /* General registers, Ax, SR.  */
  57   xtRegisterGroupUser           = 0x0200,    /* User registers.  */
  58   xtRegisterGroupFloat          = 0x0400,    /* Floating Point.  */
  59   xtRegisterGroupVectra         = 0x0800,    /* Vectra.  */
  60   xtRegisterGroupSystem         = 0x1000,    /* System.  */
  61 } xtensa_register_group_t;
  62
  63
  64 /*  Xtensa target flags.  */
  65
  66 typedef enum
  67 {
  68   xtTargetFlagsNonVisibleRegs   = 0x0001,
  69   xtTargetFlagsUseFetchStore    = 0x0002,
  70 } xtensa_target_flags_t;
  71
  72
  73 /* Xtensa ELF core file register set representation ('.reg' section).
  74    Copied from target-side ELF header <xtensa/elf.h>.  */
  75
  76 typedef unsigned long xtensa_elf_greg_t;
  77
  78 typedef struct
  79 {
  80   xtensa_elf_greg_t xchal_config_id0;
  81   xtensa_elf_greg_t xchal_config_id1;
  82   xtensa_elf_greg_t cpux;
  83   xtensa_elf_greg_t cpuy;
  84   xtensa_elf_greg_t pc;
  85   xtensa_elf_greg_t ps;
  86   xtensa_elf_greg_t exccause;
  87   xtensa_elf_greg_t excvaddr;
  88   xtensa_elf_greg_t windowbase;
  89   xtensa_elf_greg_t windowstart;
  90   xtensa_elf_greg_t lbeg;
  91   xtensa_elf_greg_t lend;
  92   xtensa_elf_greg_t lcount;
  93   xtensa_elf_greg_t sar;
  94   xtensa_elf_greg_t syscall;
  95   xtensa_elf_greg_t ar[0];      /* variable size (per config).  */
  96 } xtensa_elf_gregset_t;
  97
  98 #define SIZEOF_GREGSET (sizeof (xtensa_elf_gregset_t) + NUM_AREGS * 4)
  99 #define XTENSA_ELF_NGREG (SIZEOF_GREGSET / sizeof(xtensa_elf_greg_t))
 100
 101
 102 /*  Mask.  */
 103
 104 typedef struct
 105 {
 106   int reg_num;
 107   int bit_start;
 108   int bit_size;
 109 } xtensa_reg_mask_t;
 110
 111 typedef struct
 112 {
 113   int count;
 114   xtensa_reg_mask_t *mask;
 115 } xtensa_mask_t;
 116
 117
 118 /*  Xtensa register representation.  */
 119
 120 typedef struct
 121 {
 122   char* name;                   /* Register name.  */
 123   int offset;                   /* Offset.  */
 124   xtensa_register_type_t type;  /* Register type.  */
 125   xtensa_register_group_t group;/* Register group.  */
 126   struct type* ctype;           /* C-type.  */
 127   int bit_size;                 /* The actual bit size in the target.  */
 128   int byte_size;                /* Actual space allocated in registers[].  */
 129   int align;                    /* Alignment for this register.  */
 130
 131   unsigned int target_number;   /* Register target number.  */
 132
 133   int flags;                    /* Flags.  */
 134
 135   const xtensa_mask_t *mask;    /* Register is a compilation of other regs.  */
 136   const char *fetch;            /* Instruction sequence to fetch register.  */
 137   const char *store;            /* Instruction sequence to store register.  */
 138 } xtensa_register_t;
 139
 140
 141 #define XTENSA_REGISTER_FLAGS_PRIVILEDGED       0x0001
 142 #define XTENSA_REGISTER_FLAGS_READABLE          0x0002
 143 #define XTENSA_REGISTER_FLAGS_WRITABLE          0x0004
 144 #define XTENSA_REGISTER_FLAGS_VOLATILE          0x0008
 145
 146
 147 /*  Call-ABI for stack frame.  */
 148
 149 typedef enum
 150 {
 151   CallAbiDefault = 0,           /* Any 'callX' instructions; default stack.  */
 152   CallAbiCall0Only,             /* Only 'call0' instructions; flat stack.  */
 153 } call_abi_t;
 154
 155
 156 /*  Xtensa-specific target dependencies.  */
 157
 158 struct gdbarch_tdep
 159 {
 160   unsigned int target_flags;
 161
 162   /* Spill location for TIE register files under ocd.  */
 163
 164   unsigned int spill_location;
 165   unsigned int spill_size;
 166
 167   char *unused;                         /* Placeholder for compatibility.  */
 168   call_abi_t call_abi;                  /* Calling convention.  */
 169
 170   /* CPU configuration.  */
 171
 172   unsigned int debug_interrupt_level;
 173
 174   unsigned int icache_line_bytes;
 175   unsigned int dcache_line_bytes;
 176   unsigned int dcache_writeback;
 177
 178   unsigned int isa_use_windowed_registers;
 179   unsigned int isa_use_density_instructions;
 180   unsigned int isa_use_exceptions;
 181   unsigned int isa_use_ext_l32r;
 182   unsigned int isa_max_insn_size;       /* Maximum instruction length.  */
 183   unsigned int debug_num_ibreaks;       /* Number of IBREAKs.  */
 184   unsigned int debug_num_dbreaks;
 185
 186   /* Register map.  */
 187
 188   xtensa_register_t* regmap;
 189
 190   unsigned int num_regs;        /* Number of registers in regmap.  */
 191   unsigned int num_pseudo_regs; /* Number of pseudo registers.  */
 192   unsigned int num_aregs;       /* Size of register file.  */
 193   unsigned int num_contexts;
 194
 195   int ar_base;                  /* Register number for AR0.  */
 196   int a0_base;                  /* Register number for A0 (pseudo).  */
 197   int wb_regnum;                /* Register number for WB.  */
 198   int ws_regnum;                /* Register number for WS.  */
 199   int pc_regnum;                /* Register number for PC.  */
 200   int ps_regnum;                /* Register number for PS.  */
 201   int lbeg_regnum;              /* Register numbers for count regs.  */
 202   int lend_regnum;
 203   int lcount_regnum;
 204   int sar_regnum;               /* Register number of SAR.  */
 205   int litbase_regnum;           /* Register number of LITBASE.  */
 206
 207   int interrupt_regnum;         /* Register number for interrupt.  */
 208   int interrupt2_regnum;        /* Register number for interrupt2.  */
 209   int cpenable_regnum;          /* Register number for cpenable.  */
 210   int debugcause_regnum;        /* Register number for debugcause.  */
 211   int exccause_regnum;          /* Register number for exccause.  */
 212   int excvaddr_regnum;          /* Register number for excvaddr.  */
 213
 214   int max_register_raw_size;
 215   int max_register_virtual_size;
 216   unsigned long *fp_layout;     /* Layout of custom/TIE regs in 'FP' area.  */
 217   unsigned int fp_layout_bytes; /* Size of layout information (in bytes).  */
 218   unsigned long *gregmap;
 219 };
 220
 221
 222 /* Define macros to access some of the gdbarch entries.  */
 223 #define XTENSA_TARGET_FLAGS \
 224   (gdbarch_tdep (current_gdbarch)->target_flags)
 225 #define SPILL_LOCATION \
 226   (gdbarch_tdep (current_gdbarch)->spill_location)
 227 #define SPILL_SIZE \
 228   (gdbarch_tdep (current_gdbarch)->spill_size)
 229 #define CALL_ABI                \
 230   (gdbarch_tdep (current_gdbarch)->call_abi)
 231 #define ISA_USE_WINDOWED_REGISTERS \
 232   (gdbarch_tdep (current_gdbarch)->isa_use_windowed_registers)
 233 #define ISA_USE_DENSITY_INSTRUCTIONS \
 234   (gdbarch_tdep (current_gdbarch)->isa_use_density_instructions)
 235 #define ISA_USE_EXCEPTIONS \
 236   (gdbarch_tdep (current_gdbarch)->isa_use_exceptions)
 237 #define ISA_USE_EXT_L32R \
 238   (gdbarch_tdep (current_gdbarch)->isa_use_ext_l32r)
 239 #define DEBUG_DATA_VADDR_TRAP_COUNT \
 240   (gdbarch_tdep (current_gdbarch)->debug_data_vaddr_trap_count)
 241 #define DEBUG_INST_VADDR_TRAP_COUNT \
 242   (gdbarch_tdep (current_gdbarch)->debug_inst_vaddr_trap_count)
 243 #define ISA_MAX_INSN_SIZE \
 244   (gdbarch_tdep (current_gdbarch)->isa_max_insn_size)
 245 #define DEBUG_NUM_IBREAKS \
 246   (gdbarch_tdep (current_gdbarch)->debug_num_ibreaks)
 247 #define DEBUG_NUM_DBREAKS \
 248   (gdbarch_tdep (current_gdbarch)->debug_num_dbreaks)
 249
 250 #define NUM_AREGS         (gdbarch_tdep (current_gdbarch)->num_aregs)
 251 #define WB_REGNUM         (gdbarch_tdep (current_gdbarch)->wb_regnum)
 252 #define WS_REGNUM         (gdbarch_tdep (current_gdbarch)->ws_regnum)
 253 #define LBEG_REGNUM       (gdbarch_tdep (current_gdbarch)->lbeg_regnum)
 254 #define LEND_REGNUM       (gdbarch_tdep (current_gdbarch)->lend_regnum)
 255 #define LCOUNT_REGNUM     (gdbarch_tdep (current_gdbarch)->lcount_regnum)
 256 #define SAR_REGNUM        (gdbarch_tdep (current_gdbarch)->sar_regnum)
 257 #define REGMAP            (gdbarch_tdep (current_gdbarch)->regmap)
 258
 259 #define LITBASE_REGNUM    (gdbarch_tdep (current_gdbarch)->litbase_regnum)
 260 #define DEBUGCAUSE_REGNUM (gdbarch_tdep (current_gdbarch)->debugcause_regnum)
 261 #define EXCCAUSE_REGNUM   (gdbarch_tdep (current_gdbarch)->exccause_regnum)
 262 #define EXCVADDR_REGNUM   (gdbarch_tdep (current_gdbarch)->excvaddr_regnum)
 263 #define NUM_IBREAKS       (gdbarch_tdep (current_gdbarch)->num_ibreaks)
 264 #define REGMAP_BYTES      (gdbarch_tdep (current_gdbarch)->regmap_bytes)
 265 #define A0_BASE           (gdbarch_tdep (current_gdbarch)->a0_base)
 266 #define AR_BASE           (gdbarch_tdep (current_gdbarch)->ar_base)
 267 #define FP_ALIAS          (NUM_REGS + NUM_PSEUDO_REGS)
 268 #define CALL_ABI          (gdbarch_tdep (current_gdbarch)->call_abi)
 269 #define NUM_CONTEXTS      (gdbarch_tdep (current_gdbarch)->num_contexts)
 270
 271 #define FP_LAYOUT         (gdbarch_tdep (current_gdbarch)->fp_layout)
 272 #define FP_LAYOUT_BYTES   (gdbarch_tdep (current_gdbarch)->fp_layout_bytes)
 273 #define GREGMAP           (gdbarch_tdep (current_gdbarch)->gregmap)
 274
 275 #define AREGS_MASK        (NUM_AREGS - 1)
 276 #define WB_MASK           (AREGS_MASK >> 2)
 277 #define WB_SHIFT          2
 278
 279 /* We assign fixed numbers to the registers of the "current" window
 280    (i.e., relative to WB).  The registers get remapped via the reg_map
 281    data structure to their corresponding register in the AR register
 282    file (see xtensa-tdep.c).  */
 283
 284 #define A0_REGNUM  (A0_BASE + 0)
 285 #define A1_REGNUM  (A0_BASE + 1)
 286 #define A2_REGNUM  (A0_BASE + 2)
 287 #define A3_REGNUM  (A0_BASE + 3)
 288 #define A4_REGNUM  (A0_BASE + 4)
 289 #define A5_REGNUM  (A0_BASE + 5)
 290 #define A6_REGNUM  (A0_BASE + 6)
 291 #define A7_REGNUM  (A0_BASE + 7)
 292 #define A8_REGNUM  (A0_BASE + 8)
 293 #define A9_REGNUM  (A0_BASE + 9)
 294 #define A10_REGNUM (A0_BASE + 10)
 295 #define A11_REGNUM (A0_BASE + 11)
 296 #define A12_REGNUM (A0_BASE + 12)
 297 #define A13_REGNUM (A0_BASE + 13)
 298 #define A14_REGNUM (A0_BASE + 14)
 299 #define A15_REGNUM (A0_BASE + 15)
 300