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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20
  21 /* XTENSA_TDEP_VERSION can/should be changed along with XTENSA_CONFIG_VERSION
  22    whenever the "tdep" structure changes in an incompatible way.  */
  23
  24 #define XTENSA_TDEP_VERSION 0x60
  25
  26 /*  Xtensa register type.  */
  27
  28 typedef enum
  29 {
  30   xtRegisterTypeArRegfile = 1,  /* Register File ar0..arXX.  */
  31   xtRegisterTypeSpecialReg,     /* CPU states, such as PS, Booleans, (rsr).  */
  32   xtRegisterTypeUserReg,        /* User defined registers (rur).  */
  33   xtRegisterTypeTieRegfile,     /* User define register files.  */
  34   xtRegisterTypeTieState,       /* TIE States (mapped on user regs).  */
  35   xtRegisterTypeMapped,         /* Mapped on Special Registers.  */
  36   xtRegisterTypeUnmapped,       /* Special case of masked registers.  */
  37   xtRegisterTypeWindow,         /* Live window registers (a0..a15).  */
  38   xtRegisterTypeVirtual,        /* PC, FP.  */
  39   xtRegisterTypeUnknown
  40 } xtensa_register_type_t;
  41
  42
  43 /*  Xtensa register group.  */
  44
  45 #define XTENSA_MAX_COPROCESSOR  0x08  /* Number of Xtensa coprocessors.  */
  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
  62   xtRegisterGroupCP0        = 0x01000000,    /* CP0.  */
  63   xtRegisterGroupCP1        = 0x02000000,    /* CP1.  */
  64   xtRegisterGroupCP2        = 0x04000000,    /* CP2.  */
  65   xtRegisterGroupCP3        = 0x08000000,    /* CP3.  */
  66   xtRegisterGroupCP4        = 0x10000000,    /* CP4.  */
  67   xtRegisterGroupCP5        = 0x20000000,    /* CP5.  */
  68   xtRegisterGroupCP6        = 0x40000000,    /* CP6.  */
  69   xtRegisterGroupCP7        = 0x80000000,    /* CP7.  */
  70
  71 } xtensa_register_group_t;
  72
  73
  74 /*  Xtensa target flags.  */
  75
  76 typedef enum
  77 {
  78   xtTargetFlagsNonVisibleRegs   = 0x0001,
  79   xtTargetFlagsUseFetchStore    = 0x0002,
  80 } xtensa_target_flags_t;
  81
  82
  83 /* Xtensa ELF core file register set representation ('.reg' section).
  84    Copied from target-side ELF header <xtensa/elf.h>.  */
  85
  86 typedef unsigned long xtensa_elf_greg_t;
  87
  88 typedef struct
  89 {
  90   xtensa_elf_greg_t xchal_config_id0;
  91   xtensa_elf_greg_t xchal_config_id1;
  92   xtensa_elf_greg_t cpux;
  93   xtensa_elf_greg_t cpuy;
  94   xtensa_elf_greg_t pc;
  95   xtensa_elf_greg_t ps;
  96   xtensa_elf_greg_t exccause;
  97   xtensa_elf_greg_t excvaddr;
  98   xtensa_elf_greg_t windowbase;
  99   xtensa_elf_greg_t windowstart;
 100   xtensa_elf_greg_t lbeg;
 101   xtensa_elf_greg_t lend;
 102   xtensa_elf_greg_t lcount;
 103   xtensa_elf_greg_t sar;
 104   xtensa_elf_greg_t syscall;
 105   xtensa_elf_greg_t ar[0];      /* variable size (per config).  */
 106 } xtensa_elf_gregset_t;
 107
 108 #define SIZEOF_GREGSET (sizeof (xtensa_elf_gregset_t) + NUM_AREGS * 4)
 109 #define XTENSA_ELF_NGREG (SIZEOF_GREGSET / sizeof(xtensa_elf_greg_t))
 110
 111
 112 /*  Mask.  */
 113
 114 typedef struct
 115 {
 116   int reg_num;
 117   int bit_start;
 118   int bit_size;
 119 } xtensa_reg_mask_t;
 120
 121 typedef struct
 122 {
 123   int count;
 124   xtensa_reg_mask_t *mask;
 125 } xtensa_mask_t;
 126
 127
 128 /*  Xtensa register representation.  */
 129
 130 typedef struct
 131 {
 132   char* name;                   /* Register name.  */
 133   int offset;                   /* Offset.  */
 134   xtensa_register_type_t type;  /* Register type.  */
 135   xtensa_register_group_t group;/* Register group.  */
 136   struct type* ctype;           /* C-type.  */
 137   int bit_size;                 /* The actual bit size in the target.  */
 138   int byte_size;                /* Actual space allocated in registers[].  */
 139   int align;                    /* Alignment for this register.  */
 140
 141   unsigned int target_number;   /* Register target number.  */
 142
 143   int flags;                    /* Flags.  */
 144
 145   const xtensa_mask_t *mask;    /* Register is a compilation of other regs.  */
 146   const char *fetch;            /* Instruction sequence to fetch register.  */
 147   const char *store;            /* Instruction sequence to store register.  */
 148 } xtensa_register_t;
 149
 150
 151 #define XTENSA_REGISTER_FLAGS_PRIVILEDGED       0x0001
 152 #define XTENSA_REGISTER_FLAGS_READABLE          0x0002
 153 #define XTENSA_REGISTER_FLAGS_WRITABLE          0x0004
 154 #define XTENSA_REGISTER_FLAGS_VOLATILE          0x0008
 155
 156
 157 /*  Call-ABI for stack frame.  */
 158
 159 typedef enum
 160 {
 161   CallAbiDefault = 0,           /* Any 'callX' instructions; default stack.  */
 162   CallAbiCall0Only,             /* Only 'call0' instructions; flat stack.  */
 163 } call_abi_t;
 164
 165
 166 /*  Xtensa-specific target dependencies.  */
 167
 168 struct gdbarch_tdep
 169 {
 170   unsigned int target_flags;
 171
 172   /* Spill location for TIE register files under ocd.  */
 173
 174   unsigned int spill_location;
 175   unsigned int spill_size;
 176
 177   char *unused;                         /* Placeholder for compatibility.  */
 178   call_abi_t call_abi;                  /* Calling convention.  */
 179
 180   /* CPU configuration.  */
 181
 182   unsigned int debug_interrupt_level;
 183
 184   unsigned int icache_line_bytes;
 185   unsigned int dcache_line_bytes;
 186   unsigned int dcache_writeback;
 187
 188   unsigned int isa_use_windowed_registers;
 189   unsigned int isa_use_density_instructions;
 190   unsigned int isa_use_exceptions;
 191   unsigned int isa_use_ext_l32r;
 192   unsigned int isa_max_insn_size;       /* Maximum instruction length.  */
 193   unsigned int debug_num_ibreaks;       /* Number of IBREAKs.  */
 194   unsigned int debug_num_dbreaks;
 195
 196   /* Register map.  */
 197
 198   xtensa_register_t* regmap;
 199
 200   unsigned int num_regs;        /* Number of registers in regmap.  */
 201   unsigned int num_pseudo_regs; /* Number of pseudo registers.  */
 202   unsigned int num_aregs;       /* Size of register file.  */
 203   unsigned int num_contexts;
 204
 205   int ar_base;                  /* Register number for AR0.  */
 206   int a0_base;                  /* Register number for A0 (pseudo).  */
 207   int wb_regnum;                /* Register number for WB.  */
 208   int ws_regnum;                /* Register number for WS.  */
 209   int pc_regnum;                /* Register number for PC.  */
 210   int ps_regnum;                /* Register number for PS.  */
 211   int lbeg_regnum;              /* Register numbers for count regs.  */
 212   int lend_regnum;
 213   int lcount_regnum;
 214   int sar_regnum;               /* Register number of SAR.  */
 215   int litbase_regnum;           /* Register number of LITBASE.  */
 216
 217   int interrupt_regnum;         /* Register number for interrupt.  */
 218   int interrupt2_regnum;        /* Register number for interrupt2.  */
 219   int cpenable_regnum;          /* Register number for cpenable.  */
 220   int debugcause_regnum;        /* Register number for debugcause.  */
 221   int exccause_regnum;          /* Register number for exccause.  */
 222   int excvaddr_regnum;          /* Register number for excvaddr.  */
 223
 224   int max_register_raw_size;
 225   int max_register_virtual_size;
 226   unsigned long *fp_layout;     /* Layout of custom/TIE regs in 'FP' area.  */
 227   unsigned int fp_layout_bytes; /* Size of layout information (in bytes).  */
 228   unsigned long *gregmap;
 229 };
 230
 231
 232 /* Define macros to access some of the gdbarch entries.  */
 233 #define XTENSA_TARGET_FLAGS \
 234   (gdbarch_tdep (current_gdbarch)->target_flags)
 235 #define SPILL_LOCATION \
 236   (gdbarch_tdep (current_gdbarch)->spill_location)
 237 #define SPILL_SIZE \
 238   (gdbarch_tdep (current_gdbarch)->spill_size)
 239 #define CALL_ABI                \
 240   (gdbarch_tdep (current_gdbarch)->call_abi)
 241 #define ISA_USE_WINDOWED_REGISTERS \
 242   (gdbarch_tdep (current_gdbarch)->isa_use_windowed_registers)
 243 #define ISA_USE_DENSITY_INSTRUCTIONS \
 244   (gdbarch_tdep (current_gdbarch)->isa_use_density_instructions)
 245 #define ISA_USE_EXCEPTIONS \
 246   (gdbarch_tdep (current_gdbarch)->isa_use_exceptions)
 247 #define ISA_USE_EXT_L32R \
 248   (gdbarch_tdep (current_gdbarch)->isa_use_ext_l32r)
 249 #define DEBUG_DATA_VADDR_TRAP_COUNT \
 250   (gdbarch_tdep (current_gdbarch)->debug_data_vaddr_trap_count)
 251 #define DEBUG_INST_VADDR_TRAP_COUNT \
 252   (gdbarch_tdep (current_gdbarch)->debug_inst_vaddr_trap_count)
 253 #define ISA_MAX_INSN_SIZE \
 254   (gdbarch_tdep (current_gdbarch)->isa_max_insn_size)
 255 #define DEBUG_NUM_IBREAKS \
 256   (gdbarch_tdep (current_gdbarch)->debug_num_ibreaks)
 257 #define DEBUG_NUM_DBREAKS \
 258   (gdbarch_tdep (current_gdbarch)->debug_num_dbreaks)
 259
 260 #define NUM_AREGS         (gdbarch_tdep (current_gdbarch)->num_aregs)
 261 #define WB_REGNUM         (gdbarch_tdep (current_gdbarch)->wb_regnum)
 262 #define WS_REGNUM         (gdbarch_tdep (current_gdbarch)->ws_regnum)
 263 #define LBEG_REGNUM       (gdbarch_tdep (current_gdbarch)->lbeg_regnum)
 264 #define LEND_REGNUM       (gdbarch_tdep (current_gdbarch)->lend_regnum)
 265 #define LCOUNT_REGNUM     (gdbarch_tdep (current_gdbarch)->lcount_regnum)
 266 #define SAR_REGNUM        (gdbarch_tdep (current_gdbarch)->sar_regnum)
 267 #define REGMAP            (gdbarch_tdep (current_gdbarch)->regmap)
 268
 269 #define LITBASE_REGNUM    (gdbarch_tdep (current_gdbarch)->litbase_regnum)
 270 #define DEBUGCAUSE_REGNUM (gdbarch_tdep (current_gdbarch)->debugcause_regnum)
 271 #define EXCCAUSE_REGNUM   (gdbarch_tdep (current_gdbarch)->exccause_regnum)
 272 #define EXCVADDR_REGNUM   (gdbarch_tdep (current_gdbarch)->excvaddr_regnum)
 273 #define NUM_IBREAKS       (gdbarch_tdep (current_gdbarch)->num_ibreaks)
 274 #define REGMAP_BYTES      (gdbarch_tdep (current_gdbarch)->regmap_bytes)
 275 #define A0_BASE           (gdbarch_tdep (current_gdbarch)->a0_base)
 276 #define AR_BASE           (gdbarch_tdep (current_gdbarch)->ar_base)
 277 #define FP_ALIAS \
 278   (gdbarch_num_regs (current_gdbarch) \
 279    + gdbarch_num_pseudo_regs (current_gdbarch))
 280 #define CALL_ABI          (gdbarch_tdep (current_gdbarch)->call_abi)
 281 #define NUM_CONTEXTS      (gdbarch_tdep (current_gdbarch)->num_contexts)
 282
 283 #define FP_LAYOUT         (gdbarch_tdep (current_gdbarch)->fp_layout)
 284 #define FP_LAYOUT_BYTES   (gdbarch_tdep (current_gdbarch)->fp_layout_bytes)
 285 #define GREGMAP           (gdbarch_tdep (current_gdbarch)->gregmap)
 286
 287 #define AREGS_MASK        (NUM_AREGS - 1)
 288 #define WB_MASK           (AREGS_MASK >> 2)
 289 #define WB_SHIFT          2
 290
 291 /* We assign fixed numbers to the registers of the "current" window
 292    (i.e., relative to WB).  The registers get remapped via the reg_map
 293    data structure to their corresponding register in the AR register
 294    file (see xtensa-tdep.c).  */
 295
 296 #define A0_REGNUM  (A0_BASE + 0)
 297 #define A1_REGNUM  (A0_BASE + 1)
 298 #define A2_REGNUM  (A0_BASE + 2)
 299 #define A3_REGNUM  (A0_BASE + 3)
 300 #define A4_REGNUM  (A0_BASE + 4)
 301 #define A5_REGNUM  (A0_BASE + 5)
 302 #define A6_REGNUM  (A0_BASE + 6)
 303 #define A7_REGNUM  (A0_BASE + 7)
 304 #define A8_REGNUM  (A0_BASE + 8)
 305 #define A9_REGNUM  (A0_BASE + 9)
 306 #define A10_REGNUM (A0_BASE + 10)
 307 #define A11_REGNUM (A0_BASE + 11)
 308 #define A12_REGNUM (A0_BASE + 12)
 309 #define A13_REGNUM (A0_BASE + 13)
 310 #define A14_REGNUM (A0_BASE + 14)
 311 #define A15_REGNUM (A0_BASE + 15)
 312