1 /* Target-dependent code for the Xtensa port of GDB, the GNU debugger.
3 Copyright (C) 2003-2013 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 /* XTENSA_TDEP_VERSION can/should be changed along with XTENSA_CONFIG_VERSION
22 whenever the "tdep" structure changes in an incompatible way. */
24 #define XTENSA_TDEP_VERSION 0x60
26 /* Xtensa register type. */
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. */
40 } xtensa_register_type_t;
43 /* Xtensa register group. */
45 #define XTENSA_MAX_COPROCESSOR 0x10 /* Number of Xtensa coprocessors. */
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. */
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. */
62 xtRegisterGroupNCP = 0x00800000, /* Non-CP non-base opt/custom. */
63 xtRegisterGroupCP0 = 0x01000000, /* CP0. */
64 xtRegisterGroupCP1 = 0x02000000, /* CP1. */
65 xtRegisterGroupCP2 = 0x04000000, /* CP2. */
66 xtRegisterGroupCP3 = 0x08000000, /* CP3. */
67 xtRegisterGroupCP4 = 0x10000000, /* CP4. */
68 xtRegisterGroupCP5 = 0x20000000, /* CP5. */
69 xtRegisterGroupCP6 = 0x40000000, /* CP6. */
70 xtRegisterGroupCP7 = 0x80000000, /* CP7. */
72 } xtensa_register_group_t;
75 /* Xtensa target flags. */
79 xtTargetFlagsNonVisibleRegs = 0x0001,
80 xtTargetFlagsUseFetchStore = 0x0002,
81 } xtensa_target_flags_t;
84 /* Xtensa ELF core file register set representation ('.reg' section).
85 Copied from target-side ELF header <xtensa/elf.h>. */
87 typedef unsigned long xtensa_elf_greg_t;
93 xtensa_elf_greg_t lbeg;
94 xtensa_elf_greg_t lend;
95 xtensa_elf_greg_t lcount;
96 xtensa_elf_greg_t sar;
97 xtensa_elf_greg_t windowstart;
98 xtensa_elf_greg_t windowbase;
99 xtensa_elf_greg_t reserved[8+48];
100 xtensa_elf_greg_t ar[64];
101 } xtensa_elf_gregset_t;
103 #define XTENSA_ELF_NGREG (sizeof (xtensa_elf_gregset_t) \
104 / sizeof (xtensa_elf_greg_t))
118 xtensa_reg_mask_t *mask;
122 /* Xtensa register representation. */
126 char* name; /* Register name. */
127 int offset; /* Offset. */
128 xtensa_register_type_t type; /* Register type. */
129 xtensa_register_group_t group;/* Register group. */
130 struct type* ctype; /* C-type. */
131 int bit_size; /* The actual bit size in the target. */
132 int byte_size; /* Actual space allocated in registers[]. */
133 int align; /* Alignment for this register. */
135 unsigned int target_number; /* Register target number. */
137 int flags; /* Flags. */
138 int coprocessor; /* Coprocessor num, -1 for non-CP, else -2. */
140 const xtensa_mask_t *mask; /* Register is a compilation of other regs. */
141 const char *fetch; /* Instruction sequence to fetch register. */
142 const char *store; /* Instruction sequence to store register. */
145 /* For xtensa-config.c to expand to the structure above. */
146 #define XTREG(index,ofs,bsz,sz,al,tnum,flg,cp,ty,gr,name,fet,sto,mas,ct,x,y) \
147 {#name, ofs, ty, ((gr) | ((xtRegisterGroupNCP >> 2) << (cp + 2))), \
148 ct, bsz, sz, al, tnum, flg, cp, mas, fet, sto},
149 #define XTREG_END {0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0},
151 #define XTENSA_REGISTER_FLAGS_PRIVILEGED 0x0001
152 #define XTENSA_REGISTER_FLAGS_READABLE 0x0002
153 #define XTENSA_REGISTER_FLAGS_WRITABLE 0x0004
154 #define XTENSA_REGISTER_FLAGS_VOLATILE 0x0008
156 /* Call-ABI for stack frame. */
160 CallAbiDefault = 0, /* Any 'callX' instructions; default stack. */
161 CallAbiCall0Only, /* Only 'call0' instructions; flat stack. */
165 /* Xtensa-specific target dependencies. */
169 unsigned int target_flags;
171 /* Spill location for TIE register files under ocd. */
173 unsigned int spill_location;
174 unsigned int spill_size;
176 char *unused; /* Placeholder for compatibility. */
177 call_abi_t call_abi; /* Calling convention. */
179 /* CPU configuration. */
181 unsigned int debug_interrupt_level;
183 unsigned int icache_line_bytes;
184 unsigned int dcache_line_bytes;
185 unsigned int dcache_writeback;
187 unsigned int isa_use_windowed_registers;
188 unsigned int isa_use_density_instructions;
189 unsigned int isa_use_exceptions;
190 unsigned int isa_use_ext_l32r;
191 unsigned int isa_max_insn_size; /* Maximum instruction length. */
192 unsigned int debug_num_ibreaks; /* Number of IBREAKs. */
193 unsigned int debug_num_dbreaks;
197 xtensa_register_t* regmap;
199 unsigned int num_regs; /* Number of registers in register map. */
200 unsigned int num_nopriv_regs; /* Number of non-privileged registers. */
201 unsigned int num_pseudo_regs; /* Number of pseudo registers. */
202 unsigned int num_aregs; /* Size of register file. */
203 unsigned int num_contexts;
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. */
214 int sar_regnum; /* Register number of SAR. */
215 int litbase_regnum; /* Register number of LITBASE. */
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. */
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;
230 /* Cached register types. */
233 struct ctype_cache *next;
235 struct type *virtual_type;
239 /* Macro to instantiate a gdbarch_tdep structure. */
241 #define XTENSA_GDBARCH_TDEP_INSTANTIATE(rmap,spillsz) \
244 .spill_location = -1, \
245 .spill_size = (spillsz), \
248 .debug_interrupt_level = XCHAL_DEBUGLEVEL, \
249 .icache_line_bytes = XCHAL_ICACHE_LINESIZE, \
250 .dcache_line_bytes = XCHAL_DCACHE_LINESIZE, \
251 .dcache_writeback = XCHAL_DCACHE_IS_WRITEBACK, \
252 .isa_use_windowed_registers = (XSHAL_ABI != XTHAL_ABI_CALL0), \
253 .isa_use_density_instructions = XCHAL_HAVE_DENSITY, \
254 .isa_use_exceptions = XCHAL_HAVE_EXCEPTIONS, \
255 .isa_use_ext_l32r = XSHAL_USE_ABSOLUTE_LITERALS, \
256 .isa_max_insn_size = XCHAL_MAX_INSTRUCTION_SIZE, \
257 .debug_num_ibreaks = XCHAL_NUM_IBREAK, \
258 .debug_num_dbreaks = XCHAL_NUM_DBREAK, \
261 .num_nopriv_regs = 0, \
262 .num_pseudo_regs = 0, \
263 .num_aregs = XCHAL_NUM_AREGS, \
264 .num_contexts = XCHAL_NUM_CONTEXTS, \
273 .lcount_regnum = -1, \
275 .litbase_regnum = -1, \
276 .interrupt_regnum = -1, \
277 .interrupt2_regnum = -1, \
278 .cpenable_regnum = -1, \
279 .debugcause_regnum = -1, \
280 .exccause_regnum = -1, \
281 .excvaddr_regnum = -1, \
282 .max_register_raw_size = 0, \
283 .max_register_virtual_size = 0, \
285 .fp_layout_bytes = 0, \
288 #define XTENSA_CONFIG_INSTANTIATE(rmap,spill_size) \
289 struct gdbarch_tdep xtensa_tdep = \
290 XTENSA_GDBARCH_TDEP_INSTANTIATE(rmap,spill_size);
292 #ifndef XCHAL_NUM_CONTEXTS
293 #define XCHAL_NUM_CONTEXTS 0
295 #ifndef XCHAL_HAVE_EXCEPTIONS
296 #define XCHAL_HAVE_EXCEPTIONS 1
300 /* We assign fixed numbers to the registers of the "current" window
301 (i.e., relative to WB). The registers get remapped via the reg_map
302 data structure to their corresponding register in the AR register
303 file (see xtensa-tdep.c). */