1 /* Target-dependent code for the Xtensa port of GDB, the GNU debugger.
3 Copyright (C) 2003-2016 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
21 #include "arch/xtensa.h"
23 /* XTENSA_TDEP_VERSION can/should be changed along with XTENSA_CONFIG_VERSION
24 whenever the "tdep" structure changes in an incompatible way. */
26 #define XTENSA_TDEP_VERSION 0x60
28 /* Xtensa register type. */
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. */
42 } xtensa_register_type_t;
45 /* Xtensa register group. */
47 #define XTENSA_MAX_COPROCESSOR 0x10 /* Number of Xtensa coprocessors. */
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. */
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. */
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. */
74 } xtensa_register_group_t;
77 /* Xtensa target flags. */
81 xtTargetFlagsNonVisibleRegs = 0x0001,
82 xtTargetFlagsUseFetchStore = 0x0002,
83 } xtensa_target_flags_t;
98 xtensa_reg_mask_t *mask;
102 /* Xtensa register representation. */
106 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. */
115 unsigned int target_number; /* Register target number. */
117 int flags; /* Flags. */
118 int coprocessor; /* Coprocessor num, -1 for non-CP, else -2. */
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. */
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},
132 {0, 0, (xtensa_register_type_t) 0, (xtensa_register_group_t) 0, \
133 0, 0, 0, 0, -1, 0, 0, 0, 0, 0},
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
140 /* Call-ABI for stack frame. */
144 CallAbiDefault = 0, /* Any 'callX' instructions; default stack. */
145 CallAbiCall0Only, /* Only 'call0' instructions; flat stack. */
151 struct ctype_cache *next;
153 struct type *virtual_type;
156 /* Xtensa-specific target dependencies. */
160 unsigned int target_flags;
162 /* Spill location for TIE register files under ocd. */
164 unsigned int spill_location;
165 unsigned int spill_size;
167 char *unused; /* Placeholder for compatibility. */
168 call_abi_t call_abi; /* Calling convention. */
170 /* CPU configuration. */
172 unsigned int debug_interrupt_level;
174 unsigned int icache_line_bytes;
175 unsigned int dcache_line_bytes;
176 unsigned int dcache_writeback;
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;
188 xtensa_register_t* regmap;
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;
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. */
205 int sar_regnum; /* Register number of SAR. */
206 int litbase_regnum; /* Register number of LITBASE. */
208 int interrupt_regnum; /* Register number for interrupt. */
209 int interrupt2_regnum; /* Register number for interrupt2. */
210 int cpenable_regnum; /* Register number for cpenable. */
211 int debugcause_regnum; /* Register number for debugcause. */
212 int exccause_regnum; /* Register number for exccause. */
213 int excvaddr_regnum; /* Register number for excvaddr. */
215 int max_register_raw_size;
216 int max_register_virtual_size;
217 unsigned long *fp_layout; /* Layout of custom/TIE regs in 'FP' area. */
218 unsigned int fp_layout_bytes; /* Size of layout information (in bytes). */
219 unsigned long *gregmap;
221 /* Cached register types. */
222 struct ctype_cache *type_entries;
225 /* Macro to instantiate a gdbarch_tdep structure. */
227 #define XTENSA_GDBARCH_TDEP_INSTANTIATE(rmap,spillsz) \
230 .spill_location = -1, \
231 .spill_size = (spillsz), \
233 .call_abi = (XSHAL_ABI == XTHAL_ABI_CALL0 \
236 .debug_interrupt_level = XCHAL_DEBUGLEVEL, \
237 .icache_line_bytes = XCHAL_ICACHE_LINESIZE, \
238 .dcache_line_bytes = XCHAL_DCACHE_LINESIZE, \
239 .dcache_writeback = XCHAL_DCACHE_IS_WRITEBACK, \
240 .isa_use_windowed_registers = (XSHAL_ABI != XTHAL_ABI_CALL0), \
241 .isa_use_density_instructions = XCHAL_HAVE_DENSITY, \
242 .isa_use_exceptions = XCHAL_HAVE_EXCEPTIONS, \
243 .isa_use_ext_l32r = XSHAL_USE_ABSOLUTE_LITERALS, \
244 .isa_max_insn_size = XCHAL_MAX_INSTRUCTION_SIZE, \
245 .debug_num_ibreaks = XCHAL_NUM_IBREAK, \
246 .debug_num_dbreaks = XCHAL_NUM_DBREAK, \
249 .num_nopriv_regs = 0, \
250 .num_pseudo_regs = 0, \
251 .num_aregs = XCHAL_NUM_AREGS, \
252 .num_contexts = XCHAL_NUM_CONTEXTS, \
261 .lcount_regnum = -1, \
263 .litbase_regnum = -1, \
264 .interrupt_regnum = -1, \
265 .interrupt2_regnum = -1, \
266 .cpenable_regnum = -1, \
267 .debugcause_regnum = -1, \
268 .exccause_regnum = -1, \
269 .excvaddr_regnum = -1, \
270 .max_register_raw_size = 0, \
271 .max_register_virtual_size = 0, \
273 .fp_layout_bytes = 0, \
276 #define XTENSA_CONFIG_INSTANTIATE(rmap,spill_size) \
277 struct gdbarch_tdep xtensa_tdep = \
278 XTENSA_GDBARCH_TDEP_INSTANTIATE(rmap,spill_size);
280 #ifndef XCHAL_NUM_CONTEXTS
281 #define XCHAL_NUM_CONTEXTS 0
283 #ifndef XCHAL_HAVE_EXCEPTIONS
284 #define XCHAL_HAVE_EXCEPTIONS 1
288 /* We assign fixed numbers to the registers of the "current" window
289 (i.e., relative to WB). The registers get remapped via the reg_map
290 data structure to their corresponding register in the AR register
291 file (see xtensa-tdep.c). */