| 1 | /* Functions specific to running GDB native on HPPA running GNU/Linux. |
| 2 | |
| 3 | Copyright (C) 2004-2018 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 "gdbcore.h" |
| 22 | #include "regcache.h" |
| 23 | #include "inferior.h" |
| 24 | #include "target.h" |
| 25 | #include "linux-nat.h" |
| 26 | #include "inf-ptrace.h" |
| 27 | |
| 28 | #include <sys/procfs.h> |
| 29 | #include "nat/gdb_ptrace.h" |
| 30 | #include <linux/version.h> |
| 31 | |
| 32 | #include <asm/ptrace.h> |
| 33 | #include "hppa-linux-offsets.h" |
| 34 | |
| 35 | #include "hppa-tdep.h" |
| 36 | |
| 37 | class hppa_linux_nat_target final : public linux_nat_target |
| 38 | { |
| 39 | public: |
| 40 | /* Add our register access methods. */ |
| 41 | void fetch_registers (struct regcache *, int) override; |
| 42 | void store_registers (struct regcache *, int) override; |
| 43 | }; |
| 44 | |
| 45 | static hppa_linux_nat_target the_hppa_linux_nat_target; |
| 46 | |
| 47 | /* Prototypes for supply_gregset etc. */ |
| 48 | #include "gregset.h" |
| 49 | |
| 50 | /* These must match the order of the register names. |
| 51 | |
| 52 | Some sort of lookup table is needed because the offsets associated |
| 53 | with the registers are all over the board. */ |
| 54 | |
| 55 | static const int u_offsets[] = |
| 56 | { |
| 57 | /* general registers */ |
| 58 | -1, |
| 59 | PT_GR1, |
| 60 | PT_GR2, |
| 61 | PT_GR3, |
| 62 | PT_GR4, |
| 63 | PT_GR5, |
| 64 | PT_GR6, |
| 65 | PT_GR7, |
| 66 | PT_GR8, |
| 67 | PT_GR9, |
| 68 | PT_GR10, |
| 69 | PT_GR11, |
| 70 | PT_GR12, |
| 71 | PT_GR13, |
| 72 | PT_GR14, |
| 73 | PT_GR15, |
| 74 | PT_GR16, |
| 75 | PT_GR17, |
| 76 | PT_GR18, |
| 77 | PT_GR19, |
| 78 | PT_GR20, |
| 79 | PT_GR21, |
| 80 | PT_GR22, |
| 81 | PT_GR23, |
| 82 | PT_GR24, |
| 83 | PT_GR25, |
| 84 | PT_GR26, |
| 85 | PT_GR27, |
| 86 | PT_GR28, |
| 87 | PT_GR29, |
| 88 | PT_GR30, |
| 89 | PT_GR31, |
| 90 | |
| 91 | PT_SAR, |
| 92 | PT_IAOQ0, |
| 93 | PT_IASQ0, |
| 94 | PT_IAOQ1, |
| 95 | PT_IASQ1, |
| 96 | -1, /* eiem */ |
| 97 | PT_IIR, |
| 98 | PT_ISR, |
| 99 | PT_IOR, |
| 100 | PT_PSW, |
| 101 | -1, /* goto */ |
| 102 | |
| 103 | PT_SR4, |
| 104 | PT_SR0, |
| 105 | PT_SR1, |
| 106 | PT_SR2, |
| 107 | PT_SR3, |
| 108 | PT_SR5, |
| 109 | PT_SR6, |
| 110 | PT_SR7, |
| 111 | |
| 112 | -1, /* cr0 */ |
| 113 | -1, /* pid0 */ |
| 114 | -1, /* pid1 */ |
| 115 | -1, /* ccr */ |
| 116 | -1, /* pid2 */ |
| 117 | -1, /* pid3 */ |
| 118 | -1, /* cr24 */ |
| 119 | -1, /* cr25 */ |
| 120 | -1, /* cr26 */ |
| 121 | PT_CR27, |
| 122 | -1, /* cr28 */ |
| 123 | -1, /* cr29 */ |
| 124 | -1, /* cr30 */ |
| 125 | |
| 126 | /* Floating point regs. */ |
| 127 | PT_FR0, PT_FR0 + 4, |
| 128 | PT_FR1, PT_FR1 + 4, |
| 129 | PT_FR2, PT_FR2 + 4, |
| 130 | PT_FR3, PT_FR3 + 4, |
| 131 | PT_FR4, PT_FR4 + 4, |
| 132 | PT_FR5, PT_FR5 + 4, |
| 133 | PT_FR6, PT_FR6 + 4, |
| 134 | PT_FR7, PT_FR7 + 4, |
| 135 | PT_FR8, PT_FR8 + 4, |
| 136 | PT_FR9, PT_FR9 + 4, |
| 137 | PT_FR10, PT_FR10 + 4, |
| 138 | PT_FR11, PT_FR11 + 4, |
| 139 | PT_FR12, PT_FR12 + 4, |
| 140 | PT_FR13, PT_FR13 + 4, |
| 141 | PT_FR14, PT_FR14 + 4, |
| 142 | PT_FR15, PT_FR15 + 4, |
| 143 | PT_FR16, PT_FR16 + 4, |
| 144 | PT_FR17, PT_FR17 + 4, |
| 145 | PT_FR18, PT_FR18 + 4, |
| 146 | PT_FR19, PT_FR19 + 4, |
| 147 | PT_FR20, PT_FR20 + 4, |
| 148 | PT_FR21, PT_FR21 + 4, |
| 149 | PT_FR22, PT_FR22 + 4, |
| 150 | PT_FR23, PT_FR23 + 4, |
| 151 | PT_FR24, PT_FR24 + 4, |
| 152 | PT_FR25, PT_FR25 + 4, |
| 153 | PT_FR26, PT_FR26 + 4, |
| 154 | PT_FR27, PT_FR27 + 4, |
| 155 | PT_FR28, PT_FR28 + 4, |
| 156 | PT_FR29, PT_FR29 + 4, |
| 157 | PT_FR30, PT_FR30 + 4, |
| 158 | PT_FR31, PT_FR31 + 4, |
| 159 | }; |
| 160 | |
| 161 | static CORE_ADDR |
| 162 | hppa_linux_register_addr (int regno, CORE_ADDR blockend) |
| 163 | { |
| 164 | CORE_ADDR addr; |
| 165 | |
| 166 | if ((unsigned) regno >= ARRAY_SIZE (u_offsets)) |
| 167 | error (_("Invalid register number %d."), regno); |
| 168 | |
| 169 | if (u_offsets[regno] == -1) |
| 170 | addr = 0; |
| 171 | else |
| 172 | { |
| 173 | addr = (CORE_ADDR) u_offsets[regno]; |
| 174 | } |
| 175 | |
| 176 | return addr; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Registers saved in a coredump: |
| 181 | * gr0..gr31 |
| 182 | * sr0..sr7 |
| 183 | * iaoq0..iaoq1 |
| 184 | * iasq0..iasq1 |
| 185 | * sar, iir, isr, ior, ipsw |
| 186 | * cr0, cr24..cr31 |
| 187 | * cr8,9,12,13 |
| 188 | * cr10, cr15 |
| 189 | */ |
| 190 | #define GR_REGNUM(_n) (HPPA_R0_REGNUM+_n) |
| 191 | #define TR_REGNUM(_n) (HPPA_TR0_REGNUM+_n) |
| 192 | static const int greg_map[] = |
| 193 | { |
| 194 | GR_REGNUM(0), GR_REGNUM(1), GR_REGNUM(2), GR_REGNUM(3), |
| 195 | GR_REGNUM(4), GR_REGNUM(5), GR_REGNUM(6), GR_REGNUM(7), |
| 196 | GR_REGNUM(8), GR_REGNUM(9), GR_REGNUM(10), GR_REGNUM(11), |
| 197 | GR_REGNUM(12), GR_REGNUM(13), GR_REGNUM(14), GR_REGNUM(15), |
| 198 | GR_REGNUM(16), GR_REGNUM(17), GR_REGNUM(18), GR_REGNUM(19), |
| 199 | GR_REGNUM(20), GR_REGNUM(21), GR_REGNUM(22), GR_REGNUM(23), |
| 200 | GR_REGNUM(24), GR_REGNUM(25), GR_REGNUM(26), GR_REGNUM(27), |
| 201 | GR_REGNUM(28), GR_REGNUM(29), GR_REGNUM(30), GR_REGNUM(31), |
| 202 | |
| 203 | HPPA_SR4_REGNUM+1, HPPA_SR4_REGNUM+2, HPPA_SR4_REGNUM+3, HPPA_SR4_REGNUM+4, |
| 204 | HPPA_SR4_REGNUM, HPPA_SR4_REGNUM+5, HPPA_SR4_REGNUM+6, HPPA_SR4_REGNUM+7, |
| 205 | |
| 206 | HPPA_PCOQ_HEAD_REGNUM, HPPA_PCOQ_TAIL_REGNUM, |
| 207 | HPPA_PCSQ_HEAD_REGNUM, HPPA_PCSQ_TAIL_REGNUM, |
| 208 | |
| 209 | HPPA_SAR_REGNUM, HPPA_IIR_REGNUM, HPPA_ISR_REGNUM, HPPA_IOR_REGNUM, |
| 210 | HPPA_IPSW_REGNUM, HPPA_RCR_REGNUM, |
| 211 | |
| 212 | TR_REGNUM(0), TR_REGNUM(1), TR_REGNUM(2), TR_REGNUM(3), |
| 213 | TR_REGNUM(4), TR_REGNUM(5), TR_REGNUM(6), TR_REGNUM(7), |
| 214 | |
| 215 | HPPA_PID0_REGNUM, HPPA_PID1_REGNUM, HPPA_PID2_REGNUM, HPPA_PID3_REGNUM, |
| 216 | HPPA_CCR_REGNUM, HPPA_EIEM_REGNUM, |
| 217 | }; |
| 218 | |
| 219 | |
| 220 | |
| 221 | /* Fetch one register. */ |
| 222 | |
| 223 | static void |
| 224 | fetch_register (struct regcache *regcache, int regno) |
| 225 | { |
| 226 | struct gdbarch *gdbarch = regcache->arch (); |
| 227 | pid_t tid; |
| 228 | int val; |
| 229 | |
| 230 | if (gdbarch_cannot_fetch_register (gdbarch, regno)) |
| 231 | { |
| 232 | regcache->raw_supply (regno, NULL); |
| 233 | return; |
| 234 | } |
| 235 | |
| 236 | tid = get_ptrace_pid (regcache->ptid ()); |
| 237 | |
| 238 | errno = 0; |
| 239 | val = ptrace (PTRACE_PEEKUSER, tid, hppa_linux_register_addr (regno, 0), 0); |
| 240 | if (errno != 0) |
| 241 | error (_("Couldn't read register %s (#%d): %s."), |
| 242 | gdbarch_register_name (gdbarch, regno), |
| 243 | regno, safe_strerror (errno)); |
| 244 | |
| 245 | regcache->raw_supply (regno, &val); |
| 246 | } |
| 247 | |
| 248 | /* Store one register. */ |
| 249 | |
| 250 | static void |
| 251 | store_register (const struct regcache *regcache, int regno) |
| 252 | { |
| 253 | struct gdbarch *gdbarch = regcache->arch (); |
| 254 | pid_t tid; |
| 255 | int val; |
| 256 | |
| 257 | if (gdbarch_cannot_store_register (gdbarch, regno)) |
| 258 | return; |
| 259 | |
| 260 | tid = get_ptrace_pid (regcache->ptid ()); |
| 261 | |
| 262 | errno = 0; |
| 263 | regcache->raw_collect (regno, &val); |
| 264 | ptrace (PTRACE_POKEUSER, tid, hppa_linux_register_addr (regno, 0), val); |
| 265 | if (errno != 0) |
| 266 | error (_("Couldn't write register %s (#%d): %s."), |
| 267 | gdbarch_register_name (gdbarch, regno), |
| 268 | regno, safe_strerror (errno)); |
| 269 | } |
| 270 | |
| 271 | /* Fetch registers from the child process. Fetch all registers if |
| 272 | regno == -1, otherwise fetch all general registers or all floating |
| 273 | point registers depending upon the value of regno. */ |
| 274 | |
| 275 | void |
| 276 | hppa_linux_nat_target::fetch_inferior_registers (struct regcache *regcache, |
| 277 | int regno) |
| 278 | { |
| 279 | if (-1 == regno) |
| 280 | { |
| 281 | for (regno = 0; |
| 282 | regno < gdbarch_num_regs (regcache->arch ()); |
| 283 | regno++) |
| 284 | fetch_register (regcache, regno); |
| 285 | } |
| 286 | else |
| 287 | { |
| 288 | fetch_register (regcache, regno); |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | /* Store registers back into the inferior. Store all registers if |
| 293 | regno == -1, otherwise store all general registers or all floating |
| 294 | point registers depending upon the value of regno. */ |
| 295 | |
| 296 | void |
| 297 | hppa_linux_nat_target::store_registers (struct regcache *regcache, int regno) |
| 298 | { |
| 299 | if (-1 == regno) |
| 300 | { |
| 301 | for (regno = 0; |
| 302 | regno < gdbarch_num_regs (regcache->arch ()); |
| 303 | regno++) |
| 304 | store_register (regcache, regno); |
| 305 | } |
| 306 | else |
| 307 | { |
| 308 | store_register (regcache, regno); |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | /* Fill GDB's register array with the general-purpose register values |
| 313 | in *gregsetp. */ |
| 314 | |
| 315 | void |
| 316 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) |
| 317 | { |
| 318 | int i; |
| 319 | const greg_t *regp = (const elf_greg_t *) gregsetp; |
| 320 | |
| 321 | for (i = 0; i < sizeof (greg_map) / sizeof (greg_map[0]); i++, regp++) |
| 322 | { |
| 323 | int regno = greg_map[i]; |
| 324 | regcache->raw_supply (regno, regp); |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | /* Fill register regno (if it is a general-purpose register) in |
| 329 | *gregsetp with the appropriate value from GDB's register array. |
| 330 | If regno is -1, do this for all registers. */ |
| 331 | |
| 332 | void |
| 333 | fill_gregset (const struct regcache *regcache, |
| 334 | gdb_gregset_t *gregsetp, int regno) |
| 335 | { |
| 336 | int i; |
| 337 | |
| 338 | for (i = 0; i < sizeof (greg_map) / sizeof (greg_map[0]); i++) |
| 339 | { |
| 340 | int mregno = greg_map[i]; |
| 341 | |
| 342 | if (regno == -1 || regno == mregno) |
| 343 | regcache->raw_collect (mregno, &(*gregsetp)[i]); |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | /* Given a pointer to a floating point register set in /proc format |
| 348 | (fpregset_t *), unpack the register contents and supply them as gdb's |
| 349 | idea of the current floating point register values. */ |
| 350 | |
| 351 | void |
| 352 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) |
| 353 | { |
| 354 | int regi; |
| 355 | const char *from; |
| 356 | |
| 357 | for (regi = 0; regi <= 31; regi++) |
| 358 | { |
| 359 | from = (const char *) &((*fpregsetp)[regi]); |
| 360 | regcache->raw_supply (2*regi + HPPA_FP0_REGNUM, from); |
| 361 | regcache->raw_supply (2*regi + HPPA_FP0_REGNUM + 1, from + 4); |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | /* Given a pointer to a floating point register set in /proc format |
| 366 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
| 367 | of the current floating point register set. If REGNO is -1, update |
| 368 | them all. */ |
| 369 | |
| 370 | void |
| 371 | fill_fpregset (const struct regcache *regcache, |
| 372 | gdb_fpregset_t *fpregsetp, int regno) |
| 373 | { |
| 374 | int i; |
| 375 | |
| 376 | for (i = HPPA_FP0_REGNUM; i < HPPA_FP0_REGNUM + 32 * 2; i++) |
| 377 | { |
| 378 | /* Gross. fpregset_t is double, registers[x] has single |
| 379 | precision reg. */ |
| 380 | char *to = (char *) &((*fpregsetp)[(i - HPPA_FP0_REGNUM) / 2]); |
| 381 | if ((i - HPPA_FP0_REGNUM) & 1) |
| 382 | to += 4; |
| 383 | regcache->raw_collect (i, to); |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | void |
| 388 | _initialize_hppa_linux_nat (void) |
| 389 | { |
| 390 | /* Register the target. */ |
| 391 | linux_target = &the_hppa_linux_nat_target; |
| 392 | add_inf_child_target (&the_hppa_linux_nat_target); |
| 393 | } |