| 1 | /* S390 native-dependent code for GDB, the GNU debugger. |
| 2 | Copyright (C) 2001-2014 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
| 5 | for IBM Deutschland Entwicklung GmbH, IBM Corporation. |
| 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 "defs.h" |
| 23 | #include "regcache.h" |
| 24 | #include "inferior.h" |
| 25 | #include "target.h" |
| 26 | #include "linux-nat.h" |
| 27 | #include "auxv.h" |
| 28 | #include "gregset.h" |
| 29 | #include "regset.h" |
| 30 | |
| 31 | #include "s390-linux-tdep.h" |
| 32 | #include "elf/common.h" |
| 33 | |
| 34 | #include <asm/ptrace.h> |
| 35 | #include <sys/ptrace.h> |
| 36 | #include <asm/types.h> |
| 37 | #include <sys/procfs.h> |
| 38 | #include <sys/ucontext.h> |
| 39 | #include <elf.h> |
| 40 | |
| 41 | #ifndef PTRACE_GETREGSET |
| 42 | #define PTRACE_GETREGSET 0x4204 |
| 43 | #endif |
| 44 | |
| 45 | #ifndef PTRACE_SETREGSET |
| 46 | #define PTRACE_SETREGSET 0x4205 |
| 47 | #endif |
| 48 | |
| 49 | static int have_regset_last_break = 0; |
| 50 | static int have_regset_system_call = 0; |
| 51 | static int have_regset_tdb = 0; |
| 52 | |
| 53 | /* Register map for 32-bit executables running under a 64-bit |
| 54 | kernel. */ |
| 55 | |
| 56 | #ifdef __s390x__ |
| 57 | static const struct regcache_map_entry s390_64_regmap_gregset[] = |
| 58 | { |
| 59 | /* Skip PSWM and PSWA, since they must be handled specially. */ |
| 60 | { 2, REGCACHE_MAP_SKIP, 8 }, |
| 61 | { 1, S390_R0_UPPER_REGNUM, 4 }, { 1, S390_R0_REGNUM, 4 }, |
| 62 | { 1, S390_R1_UPPER_REGNUM, 4 }, { 1, S390_R1_REGNUM, 4 }, |
| 63 | { 1, S390_R2_UPPER_REGNUM, 4 }, { 1, S390_R2_REGNUM, 4 }, |
| 64 | { 1, S390_R3_UPPER_REGNUM, 4 }, { 1, S390_R3_REGNUM, 4 }, |
| 65 | { 1, S390_R4_UPPER_REGNUM, 4 }, { 1, S390_R4_REGNUM, 4 }, |
| 66 | { 1, S390_R5_UPPER_REGNUM, 4 }, { 1, S390_R5_REGNUM, 4 }, |
| 67 | { 1, S390_R6_UPPER_REGNUM, 4 }, { 1, S390_R6_REGNUM, 4 }, |
| 68 | { 1, S390_R7_UPPER_REGNUM, 4 }, { 1, S390_R7_REGNUM, 4 }, |
| 69 | { 1, S390_R8_UPPER_REGNUM, 4 }, { 1, S390_R8_REGNUM, 4 }, |
| 70 | { 1, S390_R9_UPPER_REGNUM, 4 }, { 1, S390_R9_REGNUM, 4 }, |
| 71 | { 1, S390_R10_UPPER_REGNUM, 4 }, { 1, S390_R10_REGNUM, 4 }, |
| 72 | { 1, S390_R11_UPPER_REGNUM, 4 }, { 1, S390_R11_REGNUM, 4 }, |
| 73 | { 1, S390_R12_UPPER_REGNUM, 4 }, { 1, S390_R12_REGNUM, 4 }, |
| 74 | { 1, S390_R13_UPPER_REGNUM, 4 }, { 1, S390_R13_REGNUM, 4 }, |
| 75 | { 1, S390_R14_UPPER_REGNUM, 4 }, { 1, S390_R14_REGNUM, 4 }, |
| 76 | { 1, S390_R15_UPPER_REGNUM, 4 }, { 1, S390_R15_REGNUM, 4 }, |
| 77 | { 16, S390_A0_REGNUM, 4 }, |
| 78 | { 1, REGCACHE_MAP_SKIP, 4 }, { 1, S390_ORIG_R2_REGNUM, 4 }, |
| 79 | { 0 } |
| 80 | }; |
| 81 | |
| 82 | static const struct regset s390_64_gregset = |
| 83 | { |
| 84 | s390_64_regmap_gregset, |
| 85 | regcache_supply_regset, |
| 86 | regcache_collect_regset |
| 87 | }; |
| 88 | |
| 89 | #define S390_PSWM_OFFSET 0 |
| 90 | #define S390_PSWA_OFFSET 8 |
| 91 | #endif |
| 92 | |
| 93 | /* Fill GDB's register array with the general-purpose register values |
| 94 | in *REGP. |
| 95 | |
| 96 | When debugging a 32-bit executable running under a 64-bit kernel, |
| 97 | we have to fix up the 64-bit registers we get from the kernel to |
| 98 | make them look like 32-bit registers. */ |
| 99 | |
| 100 | void |
| 101 | supply_gregset (struct regcache *regcache, const gregset_t *regp) |
| 102 | { |
| 103 | #ifdef __s390x__ |
| 104 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 105 | if (gdbarch_ptr_bit (gdbarch) == 32) |
| 106 | { |
| 107 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 108 | ULONGEST pswm, pswa; |
| 109 | gdb_byte buf[4]; |
| 110 | |
| 111 | regcache_supply_regset (&s390_64_gregset, regcache, -1, |
| 112 | regp, sizeof (gregset_t)); |
| 113 | pswm = extract_unsigned_integer ((const gdb_byte *) regp |
| 114 | + S390_PSWM_OFFSET, 8, byte_order); |
| 115 | pswa = extract_unsigned_integer ((const gdb_byte *) regp |
| 116 | + S390_PSWA_OFFSET, 8, byte_order); |
| 117 | store_unsigned_integer (buf, 4, byte_order, (pswm >> 32) | 0x80000); |
| 118 | regcache_raw_supply (regcache, S390_PSWM_REGNUM, buf); |
| 119 | store_unsigned_integer (buf, 4, byte_order, |
| 120 | (pswa & 0x7fffffff) | (pswm & 0x80000000)); |
| 121 | regcache_raw_supply (regcache, S390_PSWA_REGNUM, buf); |
| 122 | return; |
| 123 | } |
| 124 | #endif |
| 125 | |
| 126 | regcache_supply_regset (&s390_gregset, regcache, -1, regp, |
| 127 | sizeof (gregset_t)); |
| 128 | } |
| 129 | |
| 130 | /* Fill register REGNO (if it is a general-purpose register) in |
| 131 | *REGP with the value in GDB's register array. If REGNO is -1, |
| 132 | do this for all registers. */ |
| 133 | |
| 134 | void |
| 135 | fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno) |
| 136 | { |
| 137 | #ifdef __s390x__ |
| 138 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 139 | if (gdbarch_ptr_bit (gdbarch) == 32) |
| 140 | { |
| 141 | regcache_collect_regset (&s390_64_gregset, regcache, regno, |
| 142 | regp, sizeof (gregset_t)); |
| 143 | |
| 144 | if (regno == -1 |
| 145 | || regno == S390_PSWM_REGNUM || regno == S390_PSWA_REGNUM) |
| 146 | { |
| 147 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 148 | ULONGEST pswa, pswm; |
| 149 | gdb_byte buf[4]; |
| 150 | |
| 151 | regcache_raw_collect (regcache, S390_PSWM_REGNUM, buf); |
| 152 | pswm = extract_unsigned_integer (buf, 4, byte_order); |
| 153 | regcache_raw_collect (regcache, S390_PSWA_REGNUM, buf); |
| 154 | pswa = extract_unsigned_integer (buf, 4, byte_order); |
| 155 | |
| 156 | if (regno == -1 || regno == S390_PSWM_REGNUM) |
| 157 | store_unsigned_integer ((gdb_byte *) regp + S390_PSWM_OFFSET, 8, |
| 158 | byte_order, ((pswm & 0xfff7ffff) << 32) | |
| 159 | (pswa & 0x80000000)); |
| 160 | if (regno == -1 || regno == S390_PSWA_REGNUM) |
| 161 | store_unsigned_integer ((gdb_byte *) regp + S390_PSWA_OFFSET, 8, |
| 162 | byte_order, pswa & 0x7fffffff); |
| 163 | } |
| 164 | return; |
| 165 | } |
| 166 | #endif |
| 167 | |
| 168 | regcache_collect_regset (&s390_gregset, regcache, regno, regp, |
| 169 | sizeof (gregset_t)); |
| 170 | } |
| 171 | |
| 172 | /* Fill GDB's register array with the floating-point register values |
| 173 | in *REGP. */ |
| 174 | void |
| 175 | supply_fpregset (struct regcache *regcache, const fpregset_t *regp) |
| 176 | { |
| 177 | regcache_supply_regset (&s390_fpregset, regcache, -1, regp, |
| 178 | sizeof (fpregset_t)); |
| 179 | } |
| 180 | |
| 181 | /* Fill register REGNO (if it is a general-purpose register) in |
| 182 | *REGP with the value in GDB's register array. If REGNO is -1, |
| 183 | do this for all registers. */ |
| 184 | void |
| 185 | fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno) |
| 186 | { |
| 187 | regcache_collect_regset (&s390_fpregset, regcache, regno, regp, |
| 188 | sizeof (fpregset_t)); |
| 189 | } |
| 190 | |
| 191 | /* Find the TID for the current inferior thread to use with ptrace. */ |
| 192 | static int |
| 193 | s390_inferior_tid (void) |
| 194 | { |
| 195 | /* GNU/Linux LWP ID's are process ID's. */ |
| 196 | int tid = ptid_get_lwp (inferior_ptid); |
| 197 | if (tid == 0) |
| 198 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
| 199 | |
| 200 | return tid; |
| 201 | } |
| 202 | |
| 203 | /* Fetch all general-purpose registers from process/thread TID and |
| 204 | store their values in GDB's register cache. */ |
| 205 | static void |
| 206 | fetch_regs (struct regcache *regcache, int tid) |
| 207 | { |
| 208 | gregset_t regs; |
| 209 | ptrace_area parea; |
| 210 | |
| 211 | parea.len = sizeof (regs); |
| 212 | parea.process_addr = (addr_t) ®s; |
| 213 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); |
| 214 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) |
| 215 | perror_with_name (_("Couldn't get registers")); |
| 216 | |
| 217 | supply_gregset (regcache, (const gregset_t *) ®s); |
| 218 | } |
| 219 | |
| 220 | /* Store all valid general-purpose registers in GDB's register cache |
| 221 | into the process/thread specified by TID. */ |
| 222 | static void |
| 223 | store_regs (const struct regcache *regcache, int tid, int regnum) |
| 224 | { |
| 225 | gregset_t regs; |
| 226 | ptrace_area parea; |
| 227 | |
| 228 | parea.len = sizeof (regs); |
| 229 | parea.process_addr = (addr_t) ®s; |
| 230 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); |
| 231 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) |
| 232 | perror_with_name (_("Couldn't get registers")); |
| 233 | |
| 234 | fill_gregset (regcache, ®s, regnum); |
| 235 | |
| 236 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0) |
| 237 | perror_with_name (_("Couldn't write registers")); |
| 238 | } |
| 239 | |
| 240 | /* Fetch all floating-point registers from process/thread TID and store |
| 241 | their values in GDB's register cache. */ |
| 242 | static void |
| 243 | fetch_fpregs (struct regcache *regcache, int tid) |
| 244 | { |
| 245 | fpregset_t fpregs; |
| 246 | ptrace_area parea; |
| 247 | |
| 248 | parea.len = sizeof (fpregs); |
| 249 | parea.process_addr = (addr_t) &fpregs; |
| 250 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); |
| 251 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) |
| 252 | perror_with_name (_("Couldn't get floating point status")); |
| 253 | |
| 254 | supply_fpregset (regcache, (const fpregset_t *) &fpregs); |
| 255 | } |
| 256 | |
| 257 | /* Store all valid floating-point registers in GDB's register cache |
| 258 | into the process/thread specified by TID. */ |
| 259 | static void |
| 260 | store_fpregs (const struct regcache *regcache, int tid, int regnum) |
| 261 | { |
| 262 | fpregset_t fpregs; |
| 263 | ptrace_area parea; |
| 264 | |
| 265 | parea.len = sizeof (fpregs); |
| 266 | parea.process_addr = (addr_t) &fpregs; |
| 267 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); |
| 268 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0) |
| 269 | perror_with_name (_("Couldn't get floating point status")); |
| 270 | |
| 271 | fill_fpregset (regcache, &fpregs, regnum); |
| 272 | |
| 273 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0) |
| 274 | perror_with_name (_("Couldn't write floating point status")); |
| 275 | } |
| 276 | |
| 277 | /* Fetch all registers in the kernel's register set whose number is |
| 278 | REGSET_ID, whose size is REGSIZE, and whose layout is described by |
| 279 | REGSET, from process/thread TID and store their values in GDB's |
| 280 | register cache. */ |
| 281 | static void |
| 282 | fetch_regset (struct regcache *regcache, int tid, |
| 283 | int regset_id, int regsize, const struct regset *regset) |
| 284 | { |
| 285 | gdb_byte *buf = alloca (regsize); |
| 286 | struct iovec iov; |
| 287 | |
| 288 | iov.iov_base = buf; |
| 289 | iov.iov_len = regsize; |
| 290 | |
| 291 | if (ptrace (PTRACE_GETREGSET, tid, (long) regset_id, (long) &iov) < 0) |
| 292 | { |
| 293 | if (errno == ENODATA) |
| 294 | regcache_supply_regset (regset, regcache, -1, NULL, regsize); |
| 295 | else |
| 296 | perror_with_name (_("Couldn't get register set")); |
| 297 | } |
| 298 | else |
| 299 | regcache_supply_regset (regset, regcache, -1, buf, regsize); |
| 300 | } |
| 301 | |
| 302 | /* Store all registers in the kernel's register set whose number is |
| 303 | REGSET_ID, whose size is REGSIZE, and whose layout is described by |
| 304 | REGSET, from GDB's register cache back to process/thread TID. */ |
| 305 | static void |
| 306 | store_regset (struct regcache *regcache, int tid, |
| 307 | int regset_id, int regsize, const struct regset *regset) |
| 308 | { |
| 309 | gdb_byte *buf = alloca (regsize); |
| 310 | struct iovec iov; |
| 311 | |
| 312 | iov.iov_base = buf; |
| 313 | iov.iov_len = regsize; |
| 314 | |
| 315 | if (ptrace (PTRACE_GETREGSET, tid, (long) regset_id, (long) &iov) < 0) |
| 316 | perror_with_name (_("Couldn't get register set")); |
| 317 | |
| 318 | regcache_collect_regset (regset, regcache, -1, buf, regsize); |
| 319 | |
| 320 | if (ptrace (PTRACE_SETREGSET, tid, (long) regset_id, (long) &iov) < 0) |
| 321 | perror_with_name (_("Couldn't set register set")); |
| 322 | } |
| 323 | |
| 324 | /* Check whether the kernel provides a register set with number REGSET |
| 325 | of size REGSIZE for process/thread TID. */ |
| 326 | static int |
| 327 | check_regset (int tid, int regset, int regsize) |
| 328 | { |
| 329 | gdb_byte *buf = alloca (regsize); |
| 330 | struct iovec iov; |
| 331 | |
| 332 | iov.iov_base = buf; |
| 333 | iov.iov_len = regsize; |
| 334 | |
| 335 | if (ptrace (PTRACE_GETREGSET, tid, (long) regset, (long) &iov) >= 0 |
| 336 | || errno == ENODATA) |
| 337 | return 1; |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do |
| 342 | this for all registers. */ |
| 343 | static void |
| 344 | s390_linux_fetch_inferior_registers (struct target_ops *ops, |
| 345 | struct regcache *regcache, int regnum) |
| 346 | { |
| 347 | int tid = s390_inferior_tid (); |
| 348 | |
| 349 | if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum)) |
| 350 | fetch_regs (regcache, tid); |
| 351 | |
| 352 | if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum)) |
| 353 | fetch_fpregs (regcache, tid); |
| 354 | |
| 355 | if (have_regset_last_break) |
| 356 | if (regnum == -1 || regnum == S390_LAST_BREAK_REGNUM) |
| 357 | fetch_regset (regcache, tid, NT_S390_LAST_BREAK, 8, |
| 358 | (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32 |
| 359 | ? &s390_last_break_regset : &s390x_last_break_regset)); |
| 360 | |
| 361 | if (have_regset_system_call) |
| 362 | if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM) |
| 363 | fetch_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4, |
| 364 | &s390_system_call_regset); |
| 365 | |
| 366 | if (have_regset_tdb) |
| 367 | if (regnum == -1 || S390_IS_TDBREGSET_REGNUM (regnum)) |
| 368 | fetch_regset (regcache, tid, NT_S390_TDB, s390_sizeof_tdbregset, |
| 369 | &s390_tdb_regset); |
| 370 | } |
| 371 | |
| 372 | /* Store register REGNUM back into the child process. If REGNUM is |
| 373 | -1, do this for all registers. */ |
| 374 | static void |
| 375 | s390_linux_store_inferior_registers (struct target_ops *ops, |
| 376 | struct regcache *regcache, int regnum) |
| 377 | { |
| 378 | int tid = s390_inferior_tid (); |
| 379 | |
| 380 | if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum)) |
| 381 | store_regs (regcache, tid, regnum); |
| 382 | |
| 383 | if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum)) |
| 384 | store_fpregs (regcache, tid, regnum); |
| 385 | |
| 386 | /* S390_LAST_BREAK_REGNUM is read-only. */ |
| 387 | |
| 388 | if (have_regset_system_call) |
| 389 | if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM) |
| 390 | store_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4, |
| 391 | &s390_system_call_regset); |
| 392 | } |
| 393 | |
| 394 | |
| 395 | /* Hardware-assisted watchpoint handling. */ |
| 396 | |
| 397 | /* We maintain a list of all currently active watchpoints in order |
| 398 | to properly handle watchpoint removal. |
| 399 | |
| 400 | The only thing we actually need is the total address space area |
| 401 | spanned by the watchpoints. */ |
| 402 | |
| 403 | struct watch_area |
| 404 | { |
| 405 | struct watch_area *next; |
| 406 | CORE_ADDR lo_addr; |
| 407 | CORE_ADDR hi_addr; |
| 408 | }; |
| 409 | |
| 410 | static struct watch_area *watch_base = NULL; |
| 411 | |
| 412 | static int |
| 413 | s390_stopped_by_watchpoint (struct target_ops *ops) |
| 414 | { |
| 415 | per_lowcore_bits per_lowcore; |
| 416 | ptrace_area parea; |
| 417 | int result; |
| 418 | |
| 419 | /* Speed up common case. */ |
| 420 | if (!watch_base) |
| 421 | return 0; |
| 422 | |
| 423 | parea.len = sizeof (per_lowcore); |
| 424 | parea.process_addr = (addr_t) & per_lowcore; |
| 425 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore); |
| 426 | if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea) < 0) |
| 427 | perror_with_name (_("Couldn't retrieve watchpoint status")); |
| 428 | |
| 429 | result = (per_lowcore.perc_storage_alteration == 1 |
| 430 | && per_lowcore.perc_store_real_address == 0); |
| 431 | |
| 432 | if (result) |
| 433 | { |
| 434 | /* Do not report this watchpoint again. */ |
| 435 | memset (&per_lowcore, 0, sizeof (per_lowcore)); |
| 436 | if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea) < 0) |
| 437 | perror_with_name (_("Couldn't clear watchpoint status")); |
| 438 | } |
| 439 | |
| 440 | return result; |
| 441 | } |
| 442 | |
| 443 | static void |
| 444 | s390_fix_watch_points (struct lwp_info *lp) |
| 445 | { |
| 446 | int tid; |
| 447 | |
| 448 | per_struct per_info; |
| 449 | ptrace_area parea; |
| 450 | |
| 451 | CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0; |
| 452 | struct watch_area *area; |
| 453 | |
| 454 | tid = ptid_get_lwp (lp->ptid); |
| 455 | if (tid == 0) |
| 456 | tid = ptid_get_pid (lp->ptid); |
| 457 | |
| 458 | for (area = watch_base; area; area = area->next) |
| 459 | { |
| 460 | watch_lo_addr = min (watch_lo_addr, area->lo_addr); |
| 461 | watch_hi_addr = max (watch_hi_addr, area->hi_addr); |
| 462 | } |
| 463 | |
| 464 | parea.len = sizeof (per_info); |
| 465 | parea.process_addr = (addr_t) & per_info; |
| 466 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info); |
| 467 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea) < 0) |
| 468 | perror_with_name (_("Couldn't retrieve watchpoint status")); |
| 469 | |
| 470 | if (watch_base) |
| 471 | { |
| 472 | per_info.control_regs.bits.em_storage_alteration = 1; |
| 473 | per_info.control_regs.bits.storage_alt_space_ctl = 1; |
| 474 | } |
| 475 | else |
| 476 | { |
| 477 | per_info.control_regs.bits.em_storage_alteration = 0; |
| 478 | per_info.control_regs.bits.storage_alt_space_ctl = 0; |
| 479 | } |
| 480 | per_info.starting_addr = watch_lo_addr; |
| 481 | per_info.ending_addr = watch_hi_addr; |
| 482 | |
| 483 | if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea) < 0) |
| 484 | perror_with_name (_("Couldn't modify watchpoint status")); |
| 485 | } |
| 486 | |
| 487 | static int |
| 488 | s390_insert_watchpoint (struct target_ops *self, |
| 489 | CORE_ADDR addr, int len, int type, |
| 490 | struct expression *cond) |
| 491 | { |
| 492 | struct lwp_info *lp; |
| 493 | struct watch_area *area = xmalloc (sizeof (struct watch_area)); |
| 494 | |
| 495 | if (!area) |
| 496 | return -1; |
| 497 | |
| 498 | area->lo_addr = addr; |
| 499 | area->hi_addr = addr + len - 1; |
| 500 | |
| 501 | area->next = watch_base; |
| 502 | watch_base = area; |
| 503 | |
| 504 | ALL_LWPS (lp) |
| 505 | s390_fix_watch_points (lp); |
| 506 | return 0; |
| 507 | } |
| 508 | |
| 509 | static int |
| 510 | s390_remove_watchpoint (struct target_ops *self, |
| 511 | CORE_ADDR addr, int len, int type, |
| 512 | struct expression *cond) |
| 513 | { |
| 514 | struct lwp_info *lp; |
| 515 | struct watch_area *area, **parea; |
| 516 | |
| 517 | for (parea = &watch_base; *parea; parea = &(*parea)->next) |
| 518 | if ((*parea)->lo_addr == addr |
| 519 | && (*parea)->hi_addr == addr + len - 1) |
| 520 | break; |
| 521 | |
| 522 | if (!*parea) |
| 523 | { |
| 524 | fprintf_unfiltered (gdb_stderr, |
| 525 | "Attempt to remove nonexistent watchpoint.\n"); |
| 526 | return -1; |
| 527 | } |
| 528 | |
| 529 | area = *parea; |
| 530 | *parea = area->next; |
| 531 | xfree (area); |
| 532 | |
| 533 | ALL_LWPS (lp) |
| 534 | s390_fix_watch_points (lp); |
| 535 | return 0; |
| 536 | } |
| 537 | |
| 538 | static int |
| 539 | s390_can_use_hw_breakpoint (struct target_ops *self, |
| 540 | int type, int cnt, int othertype) |
| 541 | { |
| 542 | return type == bp_hardware_watchpoint; |
| 543 | } |
| 544 | |
| 545 | static int |
| 546 | s390_region_ok_for_hw_watchpoint (struct target_ops *self, |
| 547 | CORE_ADDR addr, int cnt) |
| 548 | { |
| 549 | return 1; |
| 550 | } |
| 551 | |
| 552 | static int |
| 553 | s390_target_wordsize (void) |
| 554 | { |
| 555 | int wordsize = 4; |
| 556 | |
| 557 | /* Check for 64-bit inferior process. This is the case when the host is |
| 558 | 64-bit, and in addition bit 32 of the PSW mask is set. */ |
| 559 | #ifdef __s390x__ |
| 560 | long pswm; |
| 561 | |
| 562 | errno = 0; |
| 563 | pswm = (long) ptrace (PTRACE_PEEKUSER, s390_inferior_tid (), PT_PSWMASK, 0); |
| 564 | if (errno == 0 && (pswm & 0x100000000ul) != 0) |
| 565 | wordsize = 8; |
| 566 | #endif |
| 567 | |
| 568 | return wordsize; |
| 569 | } |
| 570 | |
| 571 | static int |
| 572 | s390_auxv_parse (struct target_ops *ops, gdb_byte **readptr, |
| 573 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) |
| 574 | { |
| 575 | int sizeof_auxv_field = s390_target_wordsize (); |
| 576 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 577 | gdb_byte *ptr = *readptr; |
| 578 | |
| 579 | if (endptr == ptr) |
| 580 | return 0; |
| 581 | |
| 582 | if (endptr - ptr < sizeof_auxv_field * 2) |
| 583 | return -1; |
| 584 | |
| 585 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); |
| 586 | ptr += sizeof_auxv_field; |
| 587 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); |
| 588 | ptr += sizeof_auxv_field; |
| 589 | |
| 590 | *readptr = ptr; |
| 591 | return 1; |
| 592 | } |
| 593 | |
| 594 | #ifdef __s390x__ |
| 595 | static unsigned long |
| 596 | s390_get_hwcap (void) |
| 597 | { |
| 598 | CORE_ADDR field; |
| 599 | |
| 600 | if (target_auxv_search (¤t_target, AT_HWCAP, &field)) |
| 601 | return (unsigned long) field; |
| 602 | |
| 603 | return 0; |
| 604 | } |
| 605 | #endif |
| 606 | |
| 607 | static const struct target_desc * |
| 608 | s390_read_description (struct target_ops *ops) |
| 609 | { |
| 610 | int tid = s390_inferior_tid (); |
| 611 | |
| 612 | have_regset_last_break |
| 613 | = check_regset (tid, NT_S390_LAST_BREAK, 8); |
| 614 | have_regset_system_call |
| 615 | = check_regset (tid, NT_S390_SYSTEM_CALL, 4); |
| 616 | |
| 617 | #ifdef __s390x__ |
| 618 | /* If GDB itself is compiled as 64-bit, we are running on a machine in |
| 619 | z/Architecture mode. If the target is running in 64-bit addressing |
| 620 | mode, report s390x architecture. If the target is running in 31-bit |
| 621 | addressing mode, but the kernel supports using 64-bit registers in |
| 622 | that mode, report s390 architecture with 64-bit GPRs. */ |
| 623 | |
| 624 | have_regset_tdb = (s390_get_hwcap () & HWCAP_S390_TE) ? |
| 625 | check_regset (tid, NT_S390_TDB, s390_sizeof_tdbregset) : 0; |
| 626 | |
| 627 | if (s390_target_wordsize () == 8) |
| 628 | return (have_regset_tdb ? tdesc_s390x_te_linux64 : |
| 629 | have_regset_system_call? tdesc_s390x_linux64v2 : |
| 630 | have_regset_last_break? tdesc_s390x_linux64v1 : |
| 631 | tdesc_s390x_linux64); |
| 632 | |
| 633 | if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS) |
| 634 | return (have_regset_tdb ? tdesc_s390_te_linux64 : |
| 635 | have_regset_system_call? tdesc_s390_linux64v2 : |
| 636 | have_regset_last_break? tdesc_s390_linux64v1 : |
| 637 | tdesc_s390_linux64); |
| 638 | #endif |
| 639 | |
| 640 | /* If GDB itself is compiled as 31-bit, or if we're running a 31-bit inferior |
| 641 | on a 64-bit kernel that does not support using 64-bit registers in 31-bit |
| 642 | mode, report s390 architecture with 32-bit GPRs. */ |
| 643 | return (have_regset_system_call? tdesc_s390_linux32v2 : |
| 644 | have_regset_last_break? tdesc_s390_linux32v1 : |
| 645 | tdesc_s390_linux32); |
| 646 | } |
| 647 | |
| 648 | void _initialize_s390_nat (void); |
| 649 | |
| 650 | void |
| 651 | _initialize_s390_nat (void) |
| 652 | { |
| 653 | struct target_ops *t; |
| 654 | |
| 655 | /* Fill in the generic GNU/Linux methods. */ |
| 656 | t = linux_target (); |
| 657 | |
| 658 | /* Add our register access methods. */ |
| 659 | t->to_fetch_registers = s390_linux_fetch_inferior_registers; |
| 660 | t->to_store_registers = s390_linux_store_inferior_registers; |
| 661 | |
| 662 | /* Add our watchpoint methods. */ |
| 663 | t->to_can_use_hw_breakpoint = s390_can_use_hw_breakpoint; |
| 664 | t->to_region_ok_for_hw_watchpoint = s390_region_ok_for_hw_watchpoint; |
| 665 | t->to_have_continuable_watchpoint = 1; |
| 666 | t->to_stopped_by_watchpoint = s390_stopped_by_watchpoint; |
| 667 | t->to_insert_watchpoint = s390_insert_watchpoint; |
| 668 | t->to_remove_watchpoint = s390_remove_watchpoint; |
| 669 | |
| 670 | /* Detect target architecture. */ |
| 671 | t->to_read_description = s390_read_description; |
| 672 | t->to_auxv_parse = s390_auxv_parse; |
| 673 | |
| 674 | /* Register the target. */ |
| 675 | linux_nat_add_target (t); |
| 676 | linux_nat_set_new_thread (t, s390_fix_watch_points); |
| 677 | } |