| 1 | /* Target dependent code for GDB on TI C6x systems. |
| 2 | |
| 3 | Copyright (C) 2010-2015 Free Software Foundation, Inc. |
| 4 | Contributed by Andrew Jenner <andrew@codesourcery.com> |
| 5 | Contributed by Yao Qi <yao@codesourcery.com> |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "server.h" |
| 23 | #include "linux-low.h" |
| 24 | |
| 25 | #include "nat/gdb_ptrace.h" |
| 26 | #include <endian.h> |
| 27 | |
| 28 | #include "gdb_proc_service.h" |
| 29 | |
| 30 | #ifndef PTRACE_GET_THREAD_AREA |
| 31 | #define PTRACE_GET_THREAD_AREA 25 |
| 32 | #endif |
| 33 | |
| 34 | /* There are at most 69 registers accessible in ptrace. */ |
| 35 | #define TIC6X_NUM_REGS 69 |
| 36 | |
| 37 | #include <asm/ptrace.h> |
| 38 | |
| 39 | /* Defined in auto-generated file tic6x-c64xp-linux.c. */ |
| 40 | void init_registers_tic6x_c64xp_linux (void); |
| 41 | extern const struct target_desc *tdesc_tic6x_c64xp_linux; |
| 42 | |
| 43 | /* Defined in auto-generated file tic6x-c64x-linux.c. */ |
| 44 | void init_registers_tic6x_c64x_linux (void); |
| 45 | extern const struct target_desc *tdesc_tic6x_c64x_linux; |
| 46 | |
| 47 | /* Defined in auto-generated file tic62x-c6xp-linux.c. */ |
| 48 | void init_registers_tic6x_c62x_linux (void); |
| 49 | extern const struct target_desc *tdesc_tic6x_c62x_linux; |
| 50 | |
| 51 | union tic6x_register |
| 52 | { |
| 53 | unsigned char buf[4]; |
| 54 | |
| 55 | int reg32; |
| 56 | }; |
| 57 | |
| 58 | /* Return the ptrace ``address'' of register REGNO. */ |
| 59 | |
| 60 | #if __BYTE_ORDER == __BIG_ENDIAN |
| 61 | static int tic6x_regmap_c64xp[] = { |
| 62 | /* A0 - A15 */ |
| 63 | 53, 52, 55, 54, 57, 56, 59, 58, |
| 64 | 61, 60, 63, 62, 65, 64, 67, 66, |
| 65 | /* B0 - B15 */ |
| 66 | 23, 22, 25, 24, 27, 26, 29, 28, |
| 67 | 31, 30, 33, 32, 35, 34, 69, 68, |
| 68 | /* CSR PC */ |
| 69 | 5, 4, |
| 70 | /* A16 - A31 */ |
| 71 | 37, 36, 39, 38, 41, 40, 43, 42, |
| 72 | 45, 44, 47, 46, 49, 48, 51, 50, |
| 73 | /* B16 - B31 */ |
| 74 | 7, 6, 9, 8, 11, 10, 13, 12, |
| 75 | 15, 14, 17, 16, 19, 18, 21, 20, |
| 76 | /* TSR, ILC, RILC */ |
| 77 | 1, 2, 3 |
| 78 | }; |
| 79 | |
| 80 | static int tic6x_regmap_c64x[] = { |
| 81 | /* A0 - A15 */ |
| 82 | 51, 50, 53, 52, 55, 54, 57, 56, |
| 83 | 59, 58, 61, 60, 63, 62, 65, 64, |
| 84 | /* B0 - B15 */ |
| 85 | 21, 20, 23, 22, 25, 24, 27, 26, |
| 86 | 29, 28, 31, 30, 33, 32, 67, 66, |
| 87 | /* CSR PC */ |
| 88 | 3, 2, |
| 89 | /* A16 - A31 */ |
| 90 | 35, 34, 37, 36, 39, 38, 41, 40, |
| 91 | 43, 42, 45, 44, 47, 46, 49, 48, |
| 92 | /* B16 - B31 */ |
| 93 | 5, 4, 7, 6, 9, 8, 11, 10, |
| 94 | 13, 12, 15, 14, 17, 16, 19, 18, |
| 95 | -1, -1, -1 |
| 96 | }; |
| 97 | |
| 98 | static int tic6x_regmap_c62x[] = { |
| 99 | /* A0 - A15 */ |
| 100 | 19, 18, 21, 20, 23, 22, 25, 24, |
| 101 | 27, 26, 29, 28, 31, 30, 33, 32, |
| 102 | /* B0 - B15 */ |
| 103 | 5, 4, 7, 6, 9, 8, 11, 10, |
| 104 | 13, 12, 15, 14, 17, 16, 35, 34, |
| 105 | /* CSR, PC */ |
| 106 | 3, 2, |
| 107 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 108 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 109 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 110 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 111 | -1, -1, -1 |
| 112 | }; |
| 113 | |
| 114 | #else |
| 115 | static int tic6x_regmap_c64xp[] = { |
| 116 | /* A0 - A15 */ |
| 117 | 52, 53, 54, 55, 56, 57, 58, 59, |
| 118 | 60, 61, 62, 63, 64, 65, 66, 67, |
| 119 | /* B0 - B15 */ |
| 120 | 22, 23, 24, 25, 26, 27, 28, 29, |
| 121 | 30, 31, 32, 33, 34, 35, 68, 69, |
| 122 | /* CSR PC */ |
| 123 | 4, 5, |
| 124 | /* A16 - A31 */ |
| 125 | 36, 37, 38, 39, 40, 41, 42, 43, |
| 126 | 44, 45, 46, 47, 48, 49, 50, 51, |
| 127 | /* B16 -B31 */ |
| 128 | 6, 7, 8, 9, 10, 11, 12, 13, |
| 129 | 14, 15, 16, 17, 18, 19, 20, 31, |
| 130 | /* TSR, ILC, RILC */ |
| 131 | 0, 3, 2 |
| 132 | }; |
| 133 | |
| 134 | static int tic6x_regmap_c64x[] = { |
| 135 | /* A0 - A15 */ |
| 136 | 50, 51, 52, 53, 54, 55, 56, 57, |
| 137 | 58, 59, 60, 61, 62, 63, 64, 65, |
| 138 | /* B0 - B15 */ |
| 139 | 20, 21, 22, 23, 24, 25, 26, 27, |
| 140 | 28, 29, 30, 31, 32, 33, 66, 67, |
| 141 | /* CSR PC */ |
| 142 | 2, 3, |
| 143 | /* A16 - A31 */ |
| 144 | 34, 35, 36, 37, 38, 39, 40, 41, |
| 145 | 42, 43, 44, 45, 46, 47, 48, 49, |
| 146 | /* B16 - B31 */ |
| 147 | 4, 5, 6, 7, 8, 9, 10, 11, |
| 148 | 12, 13, 14, 15, 16, 17, 18, 19, |
| 149 | -1, -1, -1 |
| 150 | }; |
| 151 | |
| 152 | static int tic6x_regmap_c62x[] = { |
| 153 | /* A0 - A15 */ |
| 154 | 18, 19, 20, 21, 22, 23, 24, 25, |
| 155 | 26, 27, 28, 29, 30, 31, 32, 33, |
| 156 | /* B0 - B15 */ |
| 157 | 4, 5, 6, 7, 8, 9, 10, 11, |
| 158 | 12, 13, 14, 15, 16, 17, 34, 35, |
| 159 | /* CSR PC */ |
| 160 | 2, 3, |
| 161 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 162 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 163 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 164 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 165 | -1, -1, -1 |
| 166 | }; |
| 167 | |
| 168 | #endif |
| 169 | |
| 170 | extern struct linux_target_ops the_low_target; |
| 171 | |
| 172 | static int *tic6x_regmap; |
| 173 | static unsigned int tic6x_breakpoint; |
| 174 | #define tic6x_breakpoint_len 4 |
| 175 | |
| 176 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
| 177 | |
| 178 | static const gdb_byte * |
| 179 | tic6x_sw_breakpoint_from_kind (int kind, int *size) |
| 180 | { |
| 181 | *size = tic6x_breakpoint_len; |
| 182 | return (const gdb_byte *) &tic6x_breakpoint; |
| 183 | } |
| 184 | |
| 185 | /* Forward definition. */ |
| 186 | static struct usrregs_info tic6x_usrregs_info; |
| 187 | |
| 188 | static const struct target_desc * |
| 189 | tic6x_read_description (void) |
| 190 | { |
| 191 | register unsigned int csr asm ("B2"); |
| 192 | unsigned int cpuid; |
| 193 | const struct target_desc *tdesc; |
| 194 | |
| 195 | /* Determine the CPU we're running on to find the register order. */ |
| 196 | __asm__ ("MVC .S2 CSR,%0" : "=r" (csr) :); |
| 197 | cpuid = csr >> 24; |
| 198 | switch (cpuid) |
| 199 | { |
| 200 | case 0x00: /* C62x */ |
| 201 | case 0x02: /* C67x */ |
| 202 | tic6x_regmap = tic6x_regmap_c62x; |
| 203 | tic6x_breakpoint = 0x0000a122; /* BNOP .S2 0,5 */ |
| 204 | tdesc = tdesc_tic6x_c62x_linux; |
| 205 | break; |
| 206 | case 0x03: /* C67x+ */ |
| 207 | tic6x_regmap = tic6x_regmap_c64x; |
| 208 | tic6x_breakpoint = 0x0000a122; /* BNOP .S2 0,5 */ |
| 209 | tdesc = tdesc_tic6x_c64x_linux; |
| 210 | break; |
| 211 | case 0x0c: /* C64x */ |
| 212 | tic6x_regmap = tic6x_regmap_c64x; |
| 213 | tic6x_breakpoint = 0x0000a122; /* BNOP .S2 0,5 */ |
| 214 | tdesc = tdesc_tic6x_c64x_linux; |
| 215 | break; |
| 216 | case 0x10: /* C64x+ */ |
| 217 | case 0x14: /* C674x */ |
| 218 | case 0x15: /* C66x */ |
| 219 | tic6x_regmap = tic6x_regmap_c64xp; |
| 220 | tic6x_breakpoint = 0x56454314; /* illegal opcode */ |
| 221 | tdesc = tdesc_tic6x_c64xp_linux; |
| 222 | break; |
| 223 | default: |
| 224 | error ("Unknown CPU ID 0x%02x", cpuid); |
| 225 | } |
| 226 | tic6x_usrregs_info.regmap = tic6x_regmap; |
| 227 | return tdesc; |
| 228 | } |
| 229 | |
| 230 | static int |
| 231 | tic6x_cannot_fetch_register (int regno) |
| 232 | { |
| 233 | return (tic6x_regmap[regno] == -1); |
| 234 | } |
| 235 | |
| 236 | static int |
| 237 | tic6x_cannot_store_register (int regno) |
| 238 | { |
| 239 | return (tic6x_regmap[regno] == -1); |
| 240 | } |
| 241 | |
| 242 | static CORE_ADDR |
| 243 | tic6x_get_pc (struct regcache *regcache) |
| 244 | { |
| 245 | union tic6x_register pc; |
| 246 | |
| 247 | collect_register_by_name (regcache, "PC", pc.buf); |
| 248 | return pc.reg32; |
| 249 | } |
| 250 | |
| 251 | static void |
| 252 | tic6x_set_pc (struct regcache *regcache, CORE_ADDR pc) |
| 253 | { |
| 254 | union tic6x_register newpc; |
| 255 | |
| 256 | newpc.reg32 = pc; |
| 257 | supply_register_by_name (regcache, "PC", newpc.buf); |
| 258 | } |
| 259 | |
| 260 | static int |
| 261 | tic6x_breakpoint_at (CORE_ADDR where) |
| 262 | { |
| 263 | unsigned int insn; |
| 264 | |
| 265 | (*the_target->read_memory) (where, (unsigned char *) &insn, 4); |
| 266 | if (insn == tic6x_breakpoint) |
| 267 | return 1; |
| 268 | |
| 269 | /* If necessary, recognize more trap instructions here. GDB only uses the |
| 270 | one. */ |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | /* Fetch the thread-local storage pointer for libthread_db. */ |
| 275 | |
| 276 | ps_err_e |
| 277 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 278 | lwpid_t lwpid, int idx, void **base) |
| 279 | { |
| 280 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) |
| 281 | return PS_ERR; |
| 282 | |
| 283 | /* IDX is the bias from the thread pointer to the beginning of the |
| 284 | thread descriptor. It has to be subtracted due to implementation |
| 285 | quirks in libthread_db. */ |
| 286 | *base = (void *) ((char *) *base - idx); |
| 287 | |
| 288 | return PS_OK; |
| 289 | } |
| 290 | |
| 291 | static void |
| 292 | tic6x_collect_register (struct regcache *regcache, int regno, |
| 293 | union tic6x_register *reg) |
| 294 | { |
| 295 | union tic6x_register tmp_reg; |
| 296 | |
| 297 | collect_register (regcache, regno, &tmp_reg.reg32); |
| 298 | reg->reg32 = tmp_reg.reg32; |
| 299 | } |
| 300 | |
| 301 | static void |
| 302 | tic6x_supply_register (struct regcache *regcache, int regno, |
| 303 | const union tic6x_register *reg) |
| 304 | { |
| 305 | int offset = 0; |
| 306 | |
| 307 | supply_register (regcache, regno, reg->buf + offset); |
| 308 | } |
| 309 | |
| 310 | static void |
| 311 | tic6x_fill_gregset (struct regcache *regcache, void *buf) |
| 312 | { |
| 313 | union tic6x_register *regset = buf; |
| 314 | int i; |
| 315 | |
| 316 | for (i = 0; i < TIC6X_NUM_REGS; i++) |
| 317 | if (tic6x_regmap[i] != -1) |
| 318 | tic6x_collect_register (regcache, i, regset + tic6x_regmap[i]); |
| 319 | } |
| 320 | |
| 321 | static void |
| 322 | tic6x_store_gregset (struct regcache *regcache, const void *buf) |
| 323 | { |
| 324 | const union tic6x_register *regset = buf; |
| 325 | int i; |
| 326 | |
| 327 | for (i = 0; i < TIC6X_NUM_REGS; i++) |
| 328 | if (tic6x_regmap[i] != -1) |
| 329 | tic6x_supply_register (regcache, i, regset + tic6x_regmap[i]); |
| 330 | } |
| 331 | |
| 332 | static struct regset_info tic6x_regsets[] = { |
| 333 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, TIC6X_NUM_REGS * 4, GENERAL_REGS, |
| 334 | tic6x_fill_gregset, tic6x_store_gregset }, |
| 335 | NULL_REGSET |
| 336 | }; |
| 337 | |
| 338 | static void |
| 339 | tic6x_arch_setup (void) |
| 340 | { |
| 341 | current_process ()->tdesc = tic6x_read_description (); |
| 342 | } |
| 343 | |
| 344 | static struct regsets_info tic6x_regsets_info = |
| 345 | { |
| 346 | tic6x_regsets, /* regsets */ |
| 347 | 0, /* num_regsets */ |
| 348 | NULL, /* disabled_regsets */ |
| 349 | }; |
| 350 | |
| 351 | static struct usrregs_info tic6x_usrregs_info = |
| 352 | { |
| 353 | TIC6X_NUM_REGS, |
| 354 | NULL, /* Set in tic6x_read_description. */ |
| 355 | }; |
| 356 | |
| 357 | static struct regs_info regs_info = |
| 358 | { |
| 359 | NULL, /* regset_bitmap */ |
| 360 | &tic6x_usrregs_info, |
| 361 | &tic6x_regsets_info |
| 362 | }; |
| 363 | |
| 364 | static const struct regs_info * |
| 365 | tic6x_regs_info (void) |
| 366 | { |
| 367 | return ®s_info; |
| 368 | } |
| 369 | |
| 370 | struct linux_target_ops the_low_target = { |
| 371 | tic6x_arch_setup, |
| 372 | tic6x_regs_info, |
| 373 | tic6x_cannot_fetch_register, |
| 374 | tic6x_cannot_store_register, |
| 375 | NULL, /* fetch_register */ |
| 376 | tic6x_get_pc, |
| 377 | tic6x_set_pc, |
| 378 | NULL, /* breakpoint_kind_from_pc */ |
| 379 | tic6x_sw_breakpoint_from_kind, |
| 380 | NULL, |
| 381 | 0, |
| 382 | tic6x_breakpoint_at, |
| 383 | }; |
| 384 | |
| 385 | void |
| 386 | initialize_low_arch (void) |
| 387 | { |
| 388 | /* Initialize the Linux target descriptions. */ |
| 389 | init_registers_tic6x_c64xp_linux (); |
| 390 | init_registers_tic6x_c64x_linux (); |
| 391 | init_registers_tic6x_c62x_linux (); |
| 392 | |
| 393 | initialize_regsets_info (&tic6x_regsets_info); |
| 394 | } |