aboutsummaryrefslogtreecommitdiff
path: root/gdb/xtensa-tdep.h
blob: ba1101b7b5bf3d8f475568235242cb5043f3b34c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
/* Target-dependent code for the Xtensa port of GDB, the GNU debugger.

   Copyright (C) 2003-2023 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef XTENSA_TDEP_H
#define XTENSA_TDEP_H

#include "arch/xtensa.h"
#include "gdbarch.h"
#include "xtensa-config.h"

/* XTENSA_TDEP_VERSION can/should be changed along with XTENSA_CONFIG_VERSION
   whenever the "tdep" structure changes in an incompatible way.  */

#define XTENSA_TDEP_VERSION 0x60

/*  Xtensa register type.  */

enum xtensa_register_type_t
{
  xtRegisterTypeArRegfile = 1,	/* Register File ar0..arXX.  */
  xtRegisterTypeSpecialReg,	/* CPU states, such as PS, Booleans, (rsr).  */
  xtRegisterTypeUserReg,	/* User defined registers (rur).  */
  xtRegisterTypeTieRegfile,	/* User define register files.  */
  xtRegisterTypeTieState,	/* TIE States (mapped on user regs).  */
  xtRegisterTypeMapped,		/* Mapped on Special Registers.  */
  xtRegisterTypeUnmapped,	/* Special case of masked registers.  */
  xtRegisterTypeWindow,		/* Live window registers (a0..a15).  */
  xtRegisterTypeVirtual,	/* PC, FP.  */
  xtRegisterTypeUnknown
};


/*  Xtensa register group.  */

#define XTENSA_MAX_COPROCESSOR	0x10  /* Number of Xtensa coprocessors.  */

enum xtensa_register_group_t
{
  xtRegisterGroupUnknown = 0,
  xtRegisterGroupRegFile	= 0x0001,    /* Register files without ARx.  */
  xtRegisterGroupAddrReg	= 0x0002,    /* ARx.  */
  xtRegisterGroupSpecialReg	= 0x0004,    /* SRxx.  */
  xtRegisterGroupUserReg	= 0x0008,    /* URxx.  */
  xtRegisterGroupState 		= 0x0010,    /* States.  */

  xtRegisterGroupGeneral	= 0x0100,    /* General registers, Ax, SR.  */
  xtRegisterGroupUser		= 0x0200,    /* User registers.  */
  xtRegisterGroupFloat		= 0x0400,    /* Floating Point.  */
  xtRegisterGroupVectra		= 0x0800,    /* Vectra.  */
  xtRegisterGroupSystem		= 0x1000,    /* System.  */

  xtRegisterGroupNCP	    = 0x00800000,    /* Non-CP non-base opt/custom.  */
  xtRegisterGroupCP0	    = 0x01000000,    /* CP0.  */
  xtRegisterGroupCP1	    = 0x02000000,    /* CP1.  */
  xtRegisterGroupCP2	    = 0x04000000,    /* CP2.  */
  xtRegisterGroupCP3	    = 0x08000000,    /* CP3.  */
  xtRegisterGroupCP4	    = 0x10000000,    /* CP4.  */
  xtRegisterGroupCP5	    = 0x20000000,    /* CP5.  */
  xtRegisterGroupCP6	    = 0x40000000,    /* CP6.  */
  xtRegisterGroupCP7	    = 0x80000000,    /* CP7.  */

};


/*  Xtensa target flags.  */

enum xtensa_target_flags_t
{
  xtTargetFlagsNonVisibleRegs	= 0x0001,
  xtTargetFlagsUseFetchStore	= 0x0002,
};


/*  Mask.  */

typedef struct 
{
  int reg_num;
  int bit_start;
  int bit_size;
} xtensa_reg_mask_t;

typedef struct 
{
  int count;
  xtensa_reg_mask_t *mask;
} xtensa_mask_t;


/*  Xtensa register representation.  */

typedef struct 
{
  const char *name;            	/* Register name.  */
  int offset;             	/* Offset.  */
  xtensa_register_type_t type;  /* Register type.  */
  xtensa_register_group_t group;/* Register group.  */
  struct type* ctype;		/* C-type.  */
  int bit_size;  		/* The actual bit size in the target.  */
  int byte_size;          	/* Actual space allocated in registers[].  */
  int align;			/* Alignment for this register.  */

  unsigned int target_number;	/* Register target number.  */

  int flags;			/* Flags.  */
  int coprocessor;		/* Coprocessor num, -1 for non-CP, else -2.  */

  const xtensa_mask_t *mask;	/* Register is a compilation of other regs.  */
  const char *fetch;		/* Instruction sequence to fetch register.  */
  const char *store;		/* Instruction sequence to store register.  */
} xtensa_register_t;

/*  For xtensa-config.c to expand to the structure above.  */
#define XTREG(index,ofs,bsz,sz,al,tnum,flg,cp,ty,gr,name,fet,sto,mas,ct,x,y) \
       {#name, ofs, (xtensa_register_type_t) (ty), \
	((xtensa_register_group_t) \
	 ((gr) | ((xtRegisterGroupNCP >> 2) << (cp + 2)))), \
	 ct, bsz, sz, al, tnum, flg, cp, mas, fet, sto},
#define XTREG_END \
  {0, 0, (xtensa_register_type_t) 0, (xtensa_register_group_t) 0,	\
   0, 0, 0, 0, (unsigned) -1, 0, 0, 0, 0, 0},

#define XTENSA_REGISTER_FLAGS_PRIVILEGED	0x0001
#define XTENSA_REGISTER_FLAGS_READABLE		0x0002
#define XTENSA_REGISTER_FLAGS_WRITABLE		0x0004
#define XTENSA_REGISTER_FLAGS_VOLATILE		0x0008

/*  Call-ABI for stack frame.  */

enum call_abi_t
{
  CallAbiDefault = 0,		/* Any 'callX' instructions; default stack.  */
  CallAbiCall0Only,		/* Only 'call0' instructions; flat stack.  */
};


struct ctype_cache
{
  struct ctype_cache *next;
  int size;
  struct type *virtual_type;
};

#ifndef XCHAL_NUM_CONTEXTS
# define XCHAL_NUM_CONTEXTS	0
#endif

#ifndef XCHAL_HAVE_EXCEPTIONS
# define XCHAL_HAVE_EXCEPTIONS	1
#endif

/*  Xtensa-specific target dependencies.  */

struct xtensa_gdbarch_tdep : gdbarch_tdep_base
{
  xtensa_gdbarch_tdep (xtensa_register_t *regmap)
    : regmap (regmap)
  {}

  unsigned int target_flags = 0;

  /* Spill location for TIE register files under ocd.  */

  unsigned int spill_location = (unsigned int) -1;
  unsigned int spill_size = 0;

  char *unused = nullptr;		/* Placeholder for compatibility.  */

  /* Calling convention.  */
  call_abi_t call_abi = (XSHAL_ABI == XTHAL_ABI_CALL0
			 ? CallAbiCall0Only : CallAbiDefault);

  /* CPU configuration.  */

  unsigned int debug_interrupt_level = XCHAL_DEBUGLEVEL;

  unsigned int icache_line_bytes = XCHAL_ICACHE_LINESIZE;
  unsigned int dcache_line_bytes = XCHAL_DCACHE_LINESIZE;
  unsigned int dcache_writeback = XCHAL_DCACHE_IS_WRITEBACK;

  unsigned int isa_use_windowed_registers = XSHAL_ABI != XTHAL_ABI_CALL0;
  unsigned int isa_use_density_instructions = XCHAL_HAVE_DENSITY;
  unsigned int isa_use_exceptions = XCHAL_HAVE_EXCEPTIONS;
  unsigned int isa_use_ext_l32r = XSHAL_USE_ABSOLUTE_LITERALS;
  unsigned int isa_max_insn_size = XCHAL_MAX_INSTRUCTION_SIZE;	/* Maximum instruction length.  */
  unsigned int debug_num_ibreaks = XCHAL_NUM_IBREAK;	/* Number of IBREAKs.  */
  unsigned int debug_num_dbreaks = XCHAL_NUM_DBREAK;

  /* Register map.  */

  xtensa_register_t *regmap;

  unsigned int num_regs = 0;		/* Number of registers in register map.  */
  unsigned int num_nopriv_regs = 0;	/* Number of non-privileged registers.  */
  unsigned int num_pseudo_regs = 0;	/* Number of pseudo registers.  */
  unsigned int num_aregs = XCHAL_NUM_AREGS;		/* Size of register file.  */
  unsigned int num_contexts = XCHAL_NUM_CONTEXTS;

  int ar_base = -1;		/* Register number for AR0.  */
  int a0_base = -1;		/* Register number for A0 (pseudo).  */
  int wb_regnum = -1;		/* Register number for WB.  */
  int ws_regnum = -1;		/* Register number for WS.  */
  int pc_regnum = -1;		/* Register number for PC.  */
  int ps_regnum = -1;		/* Register number for PS.  */
  int lbeg_regnum = -1;		/* Register numbers for count regs.  */
  int lend_regnum = -1;
  int lcount_regnum = -1;
  int sar_regnum = -1;		/* Register number of SAR.  */
  int litbase_regnum = -1;	/* Register number of LITBASE.  */
  int threadptr_regnum = -1;	/* Register number of THREADPTR.  */

  int interrupt_regnum = -1;	/* Register number for interrupt.  */
  int interrupt2_regnum = -1;	/* Register number for interrupt2.  */
  int cpenable_regnum = -1;	/* Register number for cpenable.  */
  int debugcause_regnum = -1;	/* Register number for debugcause.  */
  int exccause_regnum = -1;	/* Register number for exccause.  */
  int excvaddr_regnum = -1;	/* Register number for excvaddr.  */

  int max_register_raw_size = 0;
  int max_register_virtual_size = 0;
  unsigned long *fp_layout = nullptr;	/* Layout of custom/TIE regs in 'FP' area.  */
  unsigned int fp_layout_bytes = 0;	/* Size of layout information (in bytes).  */
  unsigned long *gregmap = nullptr;

  /* Cached register types.  */
  struct ctype_cache *type_entries = nullptr;
};

#define WB_SHIFT	  2

/* We assign fixed numbers to the registers of the "current" window 
   (i.e., relative to WB).  The registers get remapped via the reg_map 
   data structure to their corresponding register in the AR register 
   file (see xtensa-tdep.c).  */

#endif /* XTENSA_TDEP_H */