gdb/xtensa-tdep.h

   1 /* Target-dependent code for the Xtensa port of GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2017 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 #include "arch/xtensa.h"
  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 #define XTENSA_MAX_COPROCESSOR  0x10  /* Number of Xtensa coprocessors.  */
  48
  49 typedef enum
  50 {
  51   xtRegisterGroupUnknown = 0,
  52   xtRegisterGroupRegFile        = 0x0001,    /* Register files without ARx.  */
  53   xtRegisterGroupAddrReg        = 0x0002,    /* ARx.  */
  54   xtRegisterGroupSpecialReg     = 0x0004,    /* SRxx.  */
  55   xtRegisterGroupUserReg        = 0x0008,    /* URxx.  */
  56   xtRegisterGroupState          = 0x0010,    /* States.  */
  57
  58   xtRegisterGroupGeneral        = 0x0100,    /* General registers, Ax, SR.  */
  59   xtRegisterGroupUser           = 0x0200,    /* User registers.  */
  60   xtRegisterGroupFloat          = 0x0400,    /* Floating Point.  */
  61   xtRegisterGroupVectra         = 0x0800,    /* Vectra.  */
  62   xtRegisterGroupSystem         = 0x1000,    /* System.  */
  63
  64   xtRegisterGroupNCP        = 0x00800000,    /* Non-CP non-base opt/custom.  */
  65   xtRegisterGroupCP0        = 0x01000000,    /* CP0.  */
  66   xtRegisterGroupCP1        = 0x02000000,    /* CP1.  */
  67   xtRegisterGroupCP2        = 0x04000000,    /* CP2.  */
  68   xtRegisterGroupCP3        = 0x08000000,    /* CP3.  */
  69   xtRegisterGroupCP4        = 0x10000000,    /* CP4.  */
  70   xtRegisterGroupCP5        = 0x20000000,    /* CP5.  */
  71   xtRegisterGroupCP6        = 0x40000000,    /* CP6.  */
  72   xtRegisterGroupCP7        = 0x80000000,    /* CP7.  */
  73
  74 } xtensa_register_group_t;
  75
  76
  77 /*  Xtensa target flags.  */
  78
  79 typedef enum
  80 {
  81   xtTargetFlagsNonVisibleRegs   = 0x0001,
  82   xtTargetFlagsUseFetchStore    = 0x0002,
  83 } xtensa_target_flags_t;
  84
  85
  86 /*  Mask.  */
  87
  88 typedef struct
  89 {
  90   int reg_num;
  91   int bit_start;
  92   int bit_size;
  93 } xtensa_reg_mask_t;
  94
  95 typedef struct
  96 {
  97   int count;
  98   xtensa_reg_mask_t *mask;
  99 } xtensa_mask_t;
 100
 101
 102 /*  Xtensa register representation.  */
 103
 104 typedef struct
 105 {
 106   const char *name;             /* Register name.  */
 107   int offset;                   /* Offset.  */
 108   xtensa_register_type_t type;  /* Register type.  */
 109   xtensa_register_group_t group;/* Register group.  */
 110   struct type* ctype;           /* C-type.  */
 111   int bit_size;                 /* The actual bit size in the target.  */
 112   int byte_size;                /* Actual space allocated in registers[].  */
 113   int align;                    /* Alignment for this register.  */
 114
 115   unsigned int target_number;   /* Register target number.  */
 116
 117   int flags;                    /* Flags.  */
 118   int coprocessor;              /* Coprocessor num, -1 for non-CP, else -2.  */
 119
 120   const xtensa_mask_t *mask;    /* Register is a compilation of other regs.  */
 121   const char *fetch;            /* Instruction sequence to fetch register.  */
 122   const char *store;            /* Instruction sequence to store register.  */
 123 } xtensa_register_t;
 124
 125 /*  For xtensa-config.c to expand to the structure above.  */
 126 #define XTREG(index,ofs,bsz,sz,al,tnum,flg,cp,ty,gr,name,fet,sto,mas,ct,x,y) \
 127        {#name, ofs, (xtensa_register_type_t) (ty), \
 128         ((xtensa_register_group_t) \
 129          ((gr) | ((xtRegisterGroupNCP >> 2) << (cp + 2)))), \
 130          ct, bsz, sz, al, tnum, flg, cp, mas, fet, sto},
 131 #define XTREG_END \
 132   {0, 0, (xtensa_register_type_t) 0, (xtensa_register_group_t) 0,       \
 133    0, 0, 0, 0, -1, 0, 0, 0, 0, 0},
 134
 135 #define XTENSA_REGISTER_FLAGS_PRIVILEGED        0x0001
 136 #define XTENSA_REGISTER_FLAGS_READABLE          0x0002
 137 #define XTENSA_REGISTER_FLAGS_WRITABLE          0x0004
 138 #define XTENSA_REGISTER_FLAGS_VOLATILE          0x0008
 139
 140 /*  Call-ABI for stack frame.  */
 141
 142 typedef enum
 143 {
 144   CallAbiDefault = 0,           /* Any 'callX' instructions; default stack.  */
 145   CallAbiCall0Only,             /* Only 'call0' instructions; flat stack.  */
 146 } call_abi_t;
 147
 148
 149 struct ctype_cache
 150 {
 151   struct ctype_cache *next;
 152   int size;
 153   struct type *virtual_type;
 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 register map.  */
 191   unsigned int num_nopriv_regs; /* Number of non-privileged registers.  */
 192   unsigned int num_pseudo_regs; /* Number of pseudo registers.  */
 193   unsigned int num_aregs;       /* Size of register file.  */
 194   unsigned int num_contexts;
 195
 196   int ar_base;                  /* Register number for AR0.  */
 197   int a0_base;                  /* Register number for A0 (pseudo).  */
 198   int wb_regnum;                /* Register number for WB.  */
 199   int ws_regnum;                /* Register number for WS.  */
 200   int pc_regnum;                /* Register number for PC.  */
 201   int ps_regnum;                /* Register number for PS.  */
 202   int lbeg_regnum;              /* Register numbers for count regs.  */
 203   int lend_regnum;
 204   int lcount_regnum;
 205   int sar_regnum;               /* Register number of SAR.  */
 206   int litbase_regnum;           /* Register number of LITBASE.  */
 207   int threadptr_regnum;         /* Register number of THREADPTR.  */
 208
 209   int interrupt_regnum;         /* Register number for interrupt.  */
 210   int interrupt2_regnum;        /* Register number for interrupt2.  */
 211   int cpenable_regnum;          /* Register number for cpenable.  */
 212   int debugcause_regnum;        /* Register number for debugcause.  */
 213   int exccause_regnum;          /* Register number for exccause.  */
 214   int excvaddr_regnum;          /* Register number for excvaddr.  */
 215
 216   int max_register_raw_size;
 217   int max_register_virtual_size;
 218   unsigned long *fp_layout;     /* Layout of custom/TIE regs in 'FP' area.  */
 219   unsigned int fp_layout_bytes; /* Size of layout information (in bytes).  */
 220   unsigned long *gregmap;
 221
 222   /* Cached register types.  */
 223   struct ctype_cache *type_entries;
 224 };
 225
 226 /* Macro to instantiate a gdbarch_tdep structure.  */
 227
 228 #define XTENSA_GDBARCH_TDEP_INSTANTIATE(rmap,spillsz)                   \
 229   {                                                                     \
 230     0,                          /* target_flags */                      \
 231     -1,                         /* spill_location */                    \
 232     (spillsz),                  /* spill_size */                        \
 233     0,                          /* unused */                            \
 234     (XSHAL_ABI == XTHAL_ABI_CALL0                                       \
 235      ? CallAbiCall0Only                                                 \
 236      : CallAbiDefault),         /* call_abi */                          \
 237     XCHAL_DEBUGLEVEL,           /* debug_interrupt_level */             \
 238     XCHAL_ICACHE_LINESIZE,      /* icache_line_bytes */                 \
 239     XCHAL_DCACHE_LINESIZE,      /* dcache_line_bytes */                 \
 240     XCHAL_DCACHE_IS_WRITEBACK,  /* dcache_writeback */                  \
 241     (XSHAL_ABI != XTHAL_ABI_CALL0),   /* isa_use_windowed_registers */  \
 242     XCHAL_HAVE_DENSITY,          /* isa_use_density_instructions */     \
 243     XCHAL_HAVE_EXCEPTIONS,       /* isa_use_exceptions */               \
 244     XSHAL_USE_ABSOLUTE_LITERALS, /* isa_use_ext_l32r */                 \
 245     XCHAL_MAX_INSTRUCTION_SIZE,  /* isa_max_insn_size */                \
 246     XCHAL_NUM_IBREAK,            /* debug_num_ibreaks */                \
 247     XCHAL_NUM_DBREAK,            /* debug_num_dbreaks */                \
 248     rmap,                        /* regmap */                           \
 249     0,                           /* num_regs */                         \
 250     0,                           /* num_nopriv_regs */                  \
 251     0,                           /* num_pseudo_regs */                  \
 252     XCHAL_NUM_AREGS,             /* num_aregs */                        \
 253     XCHAL_NUM_CONTEXTS,          /* num_contexts */                     \
 254     -1,                          /* ar_base */                          \
 255     -1,                          /* a0_base */                          \
 256     -1,                          /* wb_regnum */                        \
 257     -1,                          /* ws_regnum */                        \
 258     -1,                          /* pc_regnum */                        \
 259     -1,                          /* ps_regnum */                        \
 260     -1,                          /* lbeg_regnum */                      \
 261     -1,                          /* lend_regnum */                      \
 262     -1,                          /* lcount_regnum */                    \
 263     -1,                          /* sar_regnum */                       \
 264     -1,                          /* litbase_regnum */                   \
 265     -1,                          /* interrupt_regnum */                 \
 266     -1,                          /* interrupt2_regnum */                \
 267     -1,                          /* cpenable_regnum */                  \
 268     -1,                          /* debugcause_regnum */                \
 269     -1,                          /* exccause_regnum */                  \
 270     -1,                          /* excvaddr_regnum */                  \
 271     0,                           /* max_register_raw_size */            \
 272     0,                           /* max_register_virtual_size */        \
 273     0,                           /* fp_layout */                        \
 274     0,                           /* fp_layout_bytes */                  \
 275     0,                           /* gregmap */                          \
 276   }
 277 #define XTENSA_CONFIG_INSTANTIATE(rmap,spill_size)      \
 278         struct gdbarch_tdep xtensa_tdep = \
 279           XTENSA_GDBARCH_TDEP_INSTANTIATE(rmap,spill_size);
 280
 281 #ifndef XCHAL_NUM_CONTEXTS
 282 #define XCHAL_NUM_CONTEXTS      0
 283 #endif
 284 #ifndef XCHAL_HAVE_EXCEPTIONS
 285 #define XCHAL_HAVE_EXCEPTIONS   1
 286 #endif
 287 #define WB_SHIFT          2
 288
 289 /* We assign fixed numbers to the registers of the "current" window
 290    (i.e., relative to WB).  The registers get remapped via the reg_map
 291    data structure to their corresponding register in the AR register
 292    file (see xtensa-tdep.c).  */
 293