| 1 | /* Xtensa GNU/Linux native support. |
| 2 | |
| 3 | Copyright (C) 2007-2019 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 | #include "defs.h" |
| 21 | #include "frame.h" |
| 22 | #include "inferior.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "regcache.h" |
| 25 | #include "target.h" |
| 26 | #include "linux-nat.h" |
| 27 | #include <sys/types.h> |
| 28 | #include <signal.h> |
| 29 | #include <sys/user.h> |
| 30 | #include <sys/ioctl.h> |
| 31 | #include "gdbsupport/gdb_wait.h" |
| 32 | #include <fcntl.h> |
| 33 | #include <sys/procfs.h> |
| 34 | #include "nat/gdb_ptrace.h" |
| 35 | #include <asm/ptrace.h> |
| 36 | |
| 37 | #include "gregset.h" |
| 38 | #include "xtensa-tdep.h" |
| 39 | |
| 40 | /* Defines ps_err_e, struct ps_prochandle. */ |
| 41 | #include "gdb_proc_service.h" |
| 42 | |
| 43 | /* Extended register set depends on hardware configs. |
| 44 | Keeping these definitions separately allows to introduce |
| 45 | hardware-specific overlays. */ |
| 46 | #include "xtensa-xtregs.c" |
| 47 | |
| 48 | class xtensa_linux_nat_target final : public linux_nat_target |
| 49 | { |
| 50 | public: |
| 51 | /* Add our register access methods. */ |
| 52 | void fetch_registers (struct regcache *, int) override; |
| 53 | void store_registers (struct regcache *, int) override; |
| 54 | }; |
| 55 | |
| 56 | static xtensa_linux_nat_target the_xtensa_linux_nat_target; |
| 57 | |
| 58 | void |
| 59 | fill_gregset (const struct regcache *regcache, |
| 60 | gdb_gregset_t *gregsetp, int regnum) |
| 61 | { |
| 62 | int i; |
| 63 | xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp; |
| 64 | struct gdbarch *gdbarch = regcache->arch (); |
| 65 | |
| 66 | if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1) |
| 67 | regcache->raw_collect (gdbarch_pc_regnum (gdbarch), ®s->pc); |
| 68 | if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1) |
| 69 | regcache->raw_collect (gdbarch_ps_regnum (gdbarch), ®s->ps); |
| 70 | |
| 71 | if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1) |
| 72 | regcache->raw_collect (gdbarch_tdep (gdbarch)->wb_regnum, |
| 73 | ®s->windowbase); |
| 74 | if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1) |
| 75 | regcache->raw_collect (gdbarch_tdep (gdbarch)->ws_regnum, |
| 76 | ®s->windowstart); |
| 77 | if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1) |
| 78 | regcache->raw_collect (gdbarch_tdep (gdbarch)->lbeg_regnum, |
| 79 | ®s->lbeg); |
| 80 | if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1) |
| 81 | regcache->raw_collect (gdbarch_tdep (gdbarch)->lend_regnum, |
| 82 | ®s->lend); |
| 83 | if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1) |
| 84 | regcache->raw_collect (gdbarch_tdep (gdbarch)->lcount_regnum, |
| 85 | ®s->lcount); |
| 86 | if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1) |
| 87 | regcache->raw_collect (gdbarch_tdep (gdbarch)->sar_regnum, |
| 88 | ®s->sar); |
| 89 | if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum || regnum == -1) |
| 90 | regcache->raw_collect (gdbarch_tdep (gdbarch)->threadptr_regnum, |
| 91 | ®s->threadptr); |
| 92 | if (regnum >=gdbarch_tdep (gdbarch)->ar_base |
| 93 | && regnum < gdbarch_tdep (gdbarch)->ar_base |
| 94 | + gdbarch_tdep (gdbarch)->num_aregs) |
| 95 | regcache->raw_collect (regnum, |
| 96 | ®s->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]); |
| 97 | else if (regnum == -1) |
| 98 | { |
| 99 | for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i) |
| 100 | regcache->raw_collect (gdbarch_tdep (gdbarch)->ar_base + i, |
| 101 | ®s->ar[i]); |
| 102 | } |
| 103 | if (regnum >= gdbarch_tdep (gdbarch)->a0_base |
| 104 | && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS) |
| 105 | regcache->raw_collect (regnum, |
| 106 | ®s->ar[(4 * regs->windowbase + regnum |
| 107 | - gdbarch_tdep (gdbarch)->a0_base) |
| 108 | % gdbarch_tdep (gdbarch)->num_aregs]); |
| 109 | else if (regnum == -1) |
| 110 | { |
| 111 | for (i = 0; i < C0_NREGS; ++i) |
| 112 | regcache->raw_collect (gdbarch_tdep (gdbarch)->a0_base + i, |
| 113 | (®s->ar[(4 * regs->windowbase + i) |
| 114 | % gdbarch_tdep (gdbarch)->num_aregs])); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | static void |
| 119 | supply_gregset_reg (struct regcache *regcache, |
| 120 | const gdb_gregset_t *gregsetp, int regnum) |
| 121 | { |
| 122 | int i; |
| 123 | xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp; |
| 124 | |
| 125 | struct gdbarch *gdbarch = regcache->arch (); |
| 126 | |
| 127 | if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1) |
| 128 | regcache->raw_supply (gdbarch_pc_regnum (gdbarch), ®s->pc); |
| 129 | if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1) |
| 130 | regcache->raw_supply (gdbarch_ps_regnum (gdbarch), ®s->ps); |
| 131 | |
| 132 | if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1) |
| 133 | regcache->raw_supply (gdbarch_tdep (gdbarch)->wb_regnum, |
| 134 | ®s->windowbase); |
| 135 | if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1) |
| 136 | regcache->raw_supply (gdbarch_tdep (gdbarch)->ws_regnum, |
| 137 | ®s->windowstart); |
| 138 | if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1) |
| 139 | regcache->raw_supply (gdbarch_tdep (gdbarch)->lbeg_regnum, |
| 140 | ®s->lbeg); |
| 141 | if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1) |
| 142 | regcache->raw_supply (gdbarch_tdep (gdbarch)->lend_regnum, |
| 143 | ®s->lend); |
| 144 | if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1) |
| 145 | regcache->raw_supply (gdbarch_tdep (gdbarch)->lcount_regnum, |
| 146 | ®s->lcount); |
| 147 | if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1) |
| 148 | regcache->raw_supply (gdbarch_tdep (gdbarch)->sar_regnum, |
| 149 | ®s->sar); |
| 150 | if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum || regnum == -1) |
| 151 | regcache->raw_supply (gdbarch_tdep (gdbarch)->threadptr_regnum, |
| 152 | ®s->threadptr); |
| 153 | if (regnum >=gdbarch_tdep (gdbarch)->ar_base |
| 154 | && regnum < gdbarch_tdep (gdbarch)->ar_base |
| 155 | + gdbarch_tdep (gdbarch)->num_aregs) |
| 156 | regcache->raw_supply (regnum, |
| 157 | ®s->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]); |
| 158 | else if (regnum == -1) |
| 159 | { |
| 160 | for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i) |
| 161 | regcache->raw_supply (gdbarch_tdep (gdbarch)->ar_base + i, |
| 162 | ®s->ar[i]); |
| 163 | } |
| 164 | if (regnum >= gdbarch_tdep (gdbarch)->a0_base |
| 165 | && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS) |
| 166 | regcache->raw_supply (regnum, |
| 167 | ®s->ar[(4 * regs->windowbase + regnum |
| 168 | - gdbarch_tdep (gdbarch)->a0_base) |
| 169 | % gdbarch_tdep (gdbarch)->num_aregs]); |
| 170 | else if (regnum == -1) |
| 171 | { |
| 172 | for (i = 0; i < C0_NREGS; ++i) |
| 173 | regcache->raw_supply (gdbarch_tdep (gdbarch)->a0_base + i, |
| 174 | ®s->ar[(4 * regs->windowbase + i) |
| 175 | % gdbarch_tdep (gdbarch)->num_aregs]); |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | void |
| 180 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) |
| 181 | { |
| 182 | supply_gregset_reg (regcache, gregsetp, -1); |
| 183 | } |
| 184 | |
| 185 | void |
| 186 | fill_fpregset (const struct regcache *regcache, |
| 187 | gdb_fpregset_t *fpregsetp, int regnum) |
| 188 | { |
| 189 | return; |
| 190 | } |
| 191 | |
| 192 | void |
| 193 | supply_fpregset (struct regcache *regcache, |
| 194 | const gdb_fpregset_t *fpregsetp) |
| 195 | { |
| 196 | return; |
| 197 | } |
| 198 | |
| 199 | /* Fetch greg-register(s) from process/thread TID |
| 200 | and store value(s) in GDB's register array. */ |
| 201 | |
| 202 | static void |
| 203 | fetch_gregs (struct regcache *regcache, int regnum) |
| 204 | { |
| 205 | int tid = regcache->ptid ().lwp (); |
| 206 | gdb_gregset_t regs; |
| 207 | int areg; |
| 208 | |
| 209 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 210 | { |
| 211 | perror_with_name (_("Couldn't get registers")); |
| 212 | return; |
| 213 | } |
| 214 | |
| 215 | supply_gregset_reg (regcache, ®s, regnum); |
| 216 | } |
| 217 | |
| 218 | /* Store greg-register(s) in GDB's register |
| 219 | array into the process/thread specified by TID. */ |
| 220 | |
| 221 | static void |
| 222 | store_gregs (struct regcache *regcache, int regnum) |
| 223 | { |
| 224 | int tid = regcache->ptid ().lwp (); |
| 225 | gdb_gregset_t regs; |
| 226 | int areg; |
| 227 | |
| 228 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| 229 | { |
| 230 | perror_with_name (_("Couldn't get registers")); |
| 231 | return; |
| 232 | } |
| 233 | |
| 234 | fill_gregset (regcache, ®s, regnum); |
| 235 | |
| 236 | if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) |
| 237 | { |
| 238 | perror_with_name (_("Couldn't write registers")); |
| 239 | return; |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | static int xtreg_lo; |
| 244 | static int xtreg_high; |
| 245 | |
| 246 | /* Fetch/Store Xtensa TIE registers. Xtensa GNU/Linux PTRACE |
| 247 | interface provides special requests for this. */ |
| 248 | |
| 249 | static void |
| 250 | fetch_xtregs (struct regcache *regcache, int regnum) |
| 251 | { |
| 252 | int tid = regcache->ptid ().lwp (); |
| 253 | const xtensa_regtable_t *ptr; |
| 254 | char xtregs [XTENSA_ELF_XTREG_SIZE]; |
| 255 | |
| 256 | if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0) |
| 257 | perror_with_name (_("Couldn't get extended registers")); |
| 258 | |
| 259 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) |
| 260 | if (regnum == ptr->gdb_regnum || regnum == -1) |
| 261 | regcache->raw_supply (ptr->gdb_regnum, xtregs + ptr->ptrace_offset); |
| 262 | } |
| 263 | |
| 264 | static void |
| 265 | store_xtregs (struct regcache *regcache, int regnum) |
| 266 | { |
| 267 | int tid = regcache->ptid ().lwp (); |
| 268 | const xtensa_regtable_t *ptr; |
| 269 | char xtregs [XTENSA_ELF_XTREG_SIZE]; |
| 270 | |
| 271 | if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0) |
| 272 | perror_with_name (_("Couldn't get extended registers")); |
| 273 | |
| 274 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) |
| 275 | if (regnum == ptr->gdb_regnum || regnum == -1) |
| 276 | regcache->raw_collect (ptr->gdb_regnum, xtregs + ptr->ptrace_offset); |
| 277 | |
| 278 | if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0) |
| 279 | perror_with_name (_("Couldn't write extended registers")); |
| 280 | } |
| 281 | |
| 282 | void |
| 283 | xtensa_linux_nat_target::fetch_registers (struct regcache *regcache, |
| 284 | int regnum) |
| 285 | { |
| 286 | if (regnum == -1) |
| 287 | { |
| 288 | fetch_gregs (regcache, regnum); |
| 289 | fetch_xtregs (regcache, regnum); |
| 290 | } |
| 291 | else if ((regnum < xtreg_lo) || (regnum > xtreg_high)) |
| 292 | fetch_gregs (regcache, regnum); |
| 293 | else |
| 294 | fetch_xtregs (regcache, regnum); |
| 295 | } |
| 296 | |
| 297 | void |
| 298 | xtensa_linux_nat_target::store_registers (struct regcache *regcache, |
| 299 | int regnum) |
| 300 | { |
| 301 | if (regnum == -1) |
| 302 | { |
| 303 | store_gregs (regcache, regnum); |
| 304 | store_xtregs (regcache, regnum); |
| 305 | } |
| 306 | else if ((regnum < xtreg_lo) || (regnum > xtreg_high)) |
| 307 | store_gregs (regcache, regnum); |
| 308 | else |
| 309 | store_xtregs (regcache, regnum); |
| 310 | } |
| 311 | |
| 312 | /* Called by libthread_db. */ |
| 313 | |
| 314 | ps_err_e |
| 315 | ps_get_thread_area (struct ps_prochandle *ph, |
| 316 | lwpid_t lwpid, int idx, void **base) |
| 317 | { |
| 318 | xtensa_elf_gregset_t regs; |
| 319 | |
| 320 | if (ptrace (PTRACE_GETREGS, lwpid, NULL, ®s) != 0) |
| 321 | return PS_ERR; |
| 322 | |
| 323 | /* IDX is the bias from the thread pointer to the beginning of the |
| 324 | thread descriptor. It has to be subtracted due to implementation |
| 325 | quirks in libthread_db. */ |
| 326 | *base = (void *) ((char *) regs.threadptr - idx); |
| 327 | |
| 328 | return PS_OK; |
| 329 | } |
| 330 | |
| 331 | void |
| 332 | _initialize_xtensa_linux_nat (void) |
| 333 | { |
| 334 | const xtensa_regtable_t *ptr; |
| 335 | |
| 336 | /* Calculate the number range for extended registers. */ |
| 337 | xtreg_lo = 1000000000; |
| 338 | xtreg_high = -1; |
| 339 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) |
| 340 | { |
| 341 | if (ptr->gdb_regnum < xtreg_lo) |
| 342 | xtreg_lo = ptr->gdb_regnum; |
| 343 | if (ptr->gdb_regnum > xtreg_high) |
| 344 | xtreg_high = ptr->gdb_regnum; |
| 345 | } |
| 346 | |
| 347 | linux_target = &the_xtensa_linux_nat_target; |
| 348 | add_inf_child_target (&the_xtensa_linux_nat_target); |
| 349 | } |