| 1 | /* S390 native-dependent code for GDB, the GNU debugger. |
| 2 | Copyright (C) 2001-2018 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 | #include "nat/linux-ptrace.h" |
| 31 | #include "gdbcmd.h" |
| 32 | |
| 33 | #include "s390-tdep.h" |
| 34 | #include "s390-linux-tdep.h" |
| 35 | #include "elf/common.h" |
| 36 | |
| 37 | #include <asm/ptrace.h> |
| 38 | #include "nat/gdb_ptrace.h" |
| 39 | #include <asm/types.h> |
| 40 | #include <sys/procfs.h> |
| 41 | #include <sys/ucontext.h> |
| 42 | #include <elf.h> |
| 43 | #include <algorithm> |
| 44 | #include "inf-ptrace.h" |
| 45 | |
| 46 | /* Per-thread arch-specific data. */ |
| 47 | |
| 48 | struct arch_lwp_info |
| 49 | { |
| 50 | /* Non-zero if the thread's PER info must be re-written. */ |
| 51 | int per_info_changed; |
| 52 | }; |
| 53 | |
| 54 | static int have_regset_last_break = 0; |
| 55 | static int have_regset_system_call = 0; |
| 56 | static int have_regset_tdb = 0; |
| 57 | static int have_regset_vxrs = 0; |
| 58 | static int have_regset_gs = 0; |
| 59 | |
| 60 | /* Register map for 32-bit executables running under a 64-bit |
| 61 | kernel. */ |
| 62 | |
| 63 | #ifdef __s390x__ |
| 64 | static const struct regcache_map_entry s390_64_regmap_gregset[] = |
| 65 | { |
| 66 | /* Skip PSWM and PSWA, since they must be handled specially. */ |
| 67 | { 2, REGCACHE_MAP_SKIP, 8 }, |
| 68 | { 1, S390_R0_UPPER_REGNUM, 4 }, { 1, S390_R0_REGNUM, 4 }, |
| 69 | { 1, S390_R1_UPPER_REGNUM, 4 }, { 1, S390_R1_REGNUM, 4 }, |
| 70 | { 1, S390_R2_UPPER_REGNUM, 4 }, { 1, S390_R2_REGNUM, 4 }, |
| 71 | { 1, S390_R3_UPPER_REGNUM, 4 }, { 1, S390_R3_REGNUM, 4 }, |
| 72 | { 1, S390_R4_UPPER_REGNUM, 4 }, { 1, S390_R4_REGNUM, 4 }, |
| 73 | { 1, S390_R5_UPPER_REGNUM, 4 }, { 1, S390_R5_REGNUM, 4 }, |
| 74 | { 1, S390_R6_UPPER_REGNUM, 4 }, { 1, S390_R6_REGNUM, 4 }, |
| 75 | { 1, S390_R7_UPPER_REGNUM, 4 }, { 1, S390_R7_REGNUM, 4 }, |
| 76 | { 1, S390_R8_UPPER_REGNUM, 4 }, { 1, S390_R8_REGNUM, 4 }, |
| 77 | { 1, S390_R9_UPPER_REGNUM, 4 }, { 1, S390_R9_REGNUM, 4 }, |
| 78 | { 1, S390_R10_UPPER_REGNUM, 4 }, { 1, S390_R10_REGNUM, 4 }, |
| 79 | { 1, S390_R11_UPPER_REGNUM, 4 }, { 1, S390_R11_REGNUM, 4 }, |
| 80 | { 1, S390_R12_UPPER_REGNUM, 4 }, { 1, S390_R12_REGNUM, 4 }, |
| 81 | { 1, S390_R13_UPPER_REGNUM, 4 }, { 1, S390_R13_REGNUM, 4 }, |
| 82 | { 1, S390_R14_UPPER_REGNUM, 4 }, { 1, S390_R14_REGNUM, 4 }, |
| 83 | { 1, S390_R15_UPPER_REGNUM, 4 }, { 1, S390_R15_REGNUM, 4 }, |
| 84 | { 16, S390_A0_REGNUM, 4 }, |
| 85 | { 1, REGCACHE_MAP_SKIP, 4 }, { 1, S390_ORIG_R2_REGNUM, 4 }, |
| 86 | { 0 } |
| 87 | }; |
| 88 | |
| 89 | static const struct regset s390_64_gregset = |
| 90 | { |
| 91 | s390_64_regmap_gregset, |
| 92 | regcache_supply_regset, |
| 93 | regcache_collect_regset |
| 94 | }; |
| 95 | |
| 96 | #define S390_PSWM_OFFSET 0 |
| 97 | #define S390_PSWA_OFFSET 8 |
| 98 | #endif |
| 99 | |
| 100 | /* PER-event mask bits and PER control bits (CR9). */ |
| 101 | |
| 102 | #define PER_BIT(n) (1UL << (63 - (n))) |
| 103 | #define PER_EVENT_BRANCH PER_BIT (32) |
| 104 | #define PER_EVENT_IFETCH PER_BIT (33) |
| 105 | #define PER_EVENT_STORE PER_BIT (34) |
| 106 | #define PER_EVENT_NULLIFICATION PER_BIT (39) |
| 107 | #define PER_CONTROL_BRANCH_ADDRESS PER_BIT (40) |
| 108 | #define PER_CONTROL_SUSPENSION PER_BIT (41) |
| 109 | #define PER_CONTROL_ALTERATION PER_BIT (42) |
| 110 | |
| 111 | class s390_linux_nat_target final : public linux_nat_target |
| 112 | { |
| 113 | public: |
| 114 | /* Add our register access methods. */ |
| 115 | void fetch_registers (struct regcache *, int) override; |
| 116 | void store_registers (struct regcache *, int) override; |
| 117 | |
| 118 | /* Add our watchpoint methods. */ |
| 119 | int can_use_hw_breakpoint (enum bptype, int, int) override; |
| 120 | int insert_hw_breakpoint (struct gdbarch *, struct bp_target_info *) |
| 121 | override; |
| 122 | int remove_hw_breakpoint (struct gdbarch *, struct bp_target_info *) |
| 123 | override; |
| 124 | int region_ok_for_hw_watchpoint (CORE_ADDR, int) override; |
| 125 | bool have_continuable_watchpoint () override { return true; } |
| 126 | bool stopped_by_watchpoint () override; |
| 127 | int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type, |
| 128 | struct expression *) override; |
| 129 | int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type, |
| 130 | struct expression *) override; |
| 131 | |
| 132 | /* Detect target architecture. */ |
| 133 | const struct target_desc *read_description () override; |
| 134 | int auxv_parse (gdb_byte **readptr, |
| 135 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) |
| 136 | override; |
| 137 | |
| 138 | /* Override linux_nat_target low methods. */ |
| 139 | void low_new_thread (struct lwp_info *lp) override; |
| 140 | void low_delete_thread (struct arch_lwp_info *lp) override; |
| 141 | void low_prepare_to_resume (struct lwp_info *lp) override; |
| 142 | void low_new_fork (struct lwp_info *parent, pid_t child_pid) override; |
| 143 | void low_forget_process (pid_t pid) override; |
| 144 | }; |
| 145 | |
| 146 | static s390_linux_nat_target the_s390_linux_nat_target; |
| 147 | |
| 148 | /* Fill GDB's register array with the general-purpose register values |
| 149 | in *REGP. |
| 150 | |
| 151 | When debugging a 32-bit executable running under a 64-bit kernel, |
| 152 | we have to fix up the 64-bit registers we get from the kernel to |
| 153 | make them look like 32-bit registers. */ |
| 154 | |
| 155 | void |
| 156 | supply_gregset (struct regcache *regcache, const gregset_t *regp) |
| 157 | { |
| 158 | #ifdef __s390x__ |
| 159 | struct gdbarch *gdbarch = regcache->arch (); |
| 160 | if (gdbarch_ptr_bit (gdbarch) == 32) |
| 161 | { |
| 162 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 163 | ULONGEST pswm, pswa; |
| 164 | gdb_byte buf[4]; |
| 165 | |
| 166 | regcache_supply_regset (&s390_64_gregset, regcache, -1, |
| 167 | regp, sizeof (gregset_t)); |
| 168 | pswm = extract_unsigned_integer ((const gdb_byte *) regp |
| 169 | + S390_PSWM_OFFSET, 8, byte_order); |
| 170 | pswa = extract_unsigned_integer ((const gdb_byte *) regp |
| 171 | + S390_PSWA_OFFSET, 8, byte_order); |
| 172 | store_unsigned_integer (buf, 4, byte_order, (pswm >> 32) | 0x80000); |
| 173 | regcache_raw_supply (regcache, S390_PSWM_REGNUM, buf); |
| 174 | store_unsigned_integer (buf, 4, byte_order, |
| 175 | (pswa & 0x7fffffff) | (pswm & 0x80000000)); |
| 176 | regcache_raw_supply (regcache, S390_PSWA_REGNUM, buf); |
| 177 | return; |
| 178 | } |
| 179 | #endif |
| 180 | |
| 181 | regcache_supply_regset (&s390_gregset, regcache, -1, regp, |
| 182 | sizeof (gregset_t)); |
| 183 | } |
| 184 | |
| 185 | /* Fill register REGNO (if it is a general-purpose register) in |
| 186 | *REGP with the value in GDB's register array. If REGNO is -1, |
| 187 | do this for all registers. */ |
| 188 | |
| 189 | void |
| 190 | fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno) |
| 191 | { |
| 192 | #ifdef __s390x__ |
| 193 | struct gdbarch *gdbarch = regcache->arch (); |
| 194 | if (gdbarch_ptr_bit (gdbarch) == 32) |
| 195 | { |
| 196 | regcache_collect_regset (&s390_64_gregset, regcache, regno, |
| 197 | regp, sizeof (gregset_t)); |
| 198 | |
| 199 | if (regno == -1 |
| 200 | || regno == S390_PSWM_REGNUM || regno == S390_PSWA_REGNUM) |
| 201 | { |
| 202 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 203 | ULONGEST pswa, pswm; |
| 204 | gdb_byte buf[4]; |
| 205 | gdb_byte *pswm_p = (gdb_byte *) regp + S390_PSWM_OFFSET; |
| 206 | gdb_byte *pswa_p = (gdb_byte *) regp + S390_PSWA_OFFSET; |
| 207 | |
| 208 | pswm = extract_unsigned_integer (pswm_p, 8, byte_order); |
| 209 | |
| 210 | if (regno == -1 || regno == S390_PSWM_REGNUM) |
| 211 | { |
| 212 | pswm &= 0x80000000; |
| 213 | regcache_raw_collect (regcache, S390_PSWM_REGNUM, buf); |
| 214 | pswm |= (extract_unsigned_integer (buf, 4, byte_order) |
| 215 | & 0xfff7ffff) << 32; |
| 216 | } |
| 217 | |
| 218 | if (regno == -1 || regno == S390_PSWA_REGNUM) |
| 219 | { |
| 220 | regcache_raw_collect (regcache, S390_PSWA_REGNUM, buf); |
| 221 | pswa = extract_unsigned_integer (buf, 4, byte_order); |
| 222 | pswm ^= (pswm ^ pswa) & 0x80000000; |
| 223 | pswa &= 0x7fffffff; |
| 224 | store_unsigned_integer (pswa_p, 8, byte_order, pswa); |
| 225 | } |
| 226 | |
| 227 | store_unsigned_integer (pswm_p, 8, byte_order, pswm); |
| 228 | } |
| 229 | return; |
| 230 | } |
| 231 | #endif |
| 232 | |
| 233 | regcache_collect_regset (&s390_gregset, regcache, regno, regp, |
| 234 | sizeof (gregset_t)); |
| 235 | } |
| 236 | |
| 237 | /* Fill GDB's register array with the floating-point register values |
| 238 | in *REGP. */ |
| 239 | void |
| 240 | supply_fpregset (struct regcache *regcache, const fpregset_t *regp) |
| 241 | { |
| 242 | regcache_supply_regset (&s390_fpregset, regcache, -1, regp, |
| 243 | sizeof (fpregset_t)); |
| 244 | } |
| 245 | |
| 246 | /* Fill register REGNO (if it is a general-purpose register) in |
| 247 | *REGP with the value in GDB's register array. If REGNO is -1, |
| 248 | do this for all registers. */ |
| 249 | void |
| 250 | fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno) |
| 251 | { |
| 252 | regcache_collect_regset (&s390_fpregset, regcache, regno, regp, |
| 253 | sizeof (fpregset_t)); |
| 254 | } |
| 255 | |
| 256 | /* Find the TID for the current inferior thread to use with ptrace. */ |
| 257 | static int |
| 258 | s390_inferior_tid (void) |
| 259 | { |
| 260 | /* GNU/Linux LWP ID's are process ID's. */ |
| 261 | int tid = ptid_get_lwp (inferior_ptid); |
| 262 | if (tid == 0) |
| 263 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
| 264 | |
| 265 | return tid; |
| 266 | } |
| 267 | |
| 268 | /* Fetch all general-purpose registers from process/thread TID and |
| 269 | store their values in GDB's register cache. */ |
| 270 | static void |
| 271 | fetch_regs (struct regcache *regcache, int tid) |
| 272 | { |
| 273 | gregset_t regs; |
| 274 | ptrace_area parea; |
| 275 | |
| 276 | parea.len = sizeof (regs); |
| 277 | parea.process_addr = (addr_t) ®s; |
| 278 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); |
| 279 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0) |
| 280 | perror_with_name (_("Couldn't get registers")); |
| 281 | |
| 282 | supply_gregset (regcache, (const gregset_t *) ®s); |
| 283 | } |
| 284 | |
| 285 | /* Store all valid general-purpose registers in GDB's register cache |
| 286 | into the process/thread specified by TID. */ |
| 287 | static void |
| 288 | store_regs (const struct regcache *regcache, int tid, int regnum) |
| 289 | { |
| 290 | gregset_t regs; |
| 291 | ptrace_area parea; |
| 292 | |
| 293 | parea.len = sizeof (regs); |
| 294 | parea.process_addr = (addr_t) ®s; |
| 295 | parea.kernel_addr = offsetof (struct user_regs_struct, psw); |
| 296 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0) |
| 297 | perror_with_name (_("Couldn't get registers")); |
| 298 | |
| 299 | fill_gregset (regcache, ®s, regnum); |
| 300 | |
| 301 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea, 0) < 0) |
| 302 | perror_with_name (_("Couldn't write registers")); |
| 303 | } |
| 304 | |
| 305 | /* Fetch all floating-point registers from process/thread TID and store |
| 306 | their values in GDB's register cache. */ |
| 307 | static void |
| 308 | fetch_fpregs (struct regcache *regcache, int tid) |
| 309 | { |
| 310 | fpregset_t fpregs; |
| 311 | ptrace_area parea; |
| 312 | |
| 313 | parea.len = sizeof (fpregs); |
| 314 | parea.process_addr = (addr_t) &fpregs; |
| 315 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); |
| 316 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0) |
| 317 | perror_with_name (_("Couldn't get floating point status")); |
| 318 | |
| 319 | supply_fpregset (regcache, (const fpregset_t *) &fpregs); |
| 320 | } |
| 321 | |
| 322 | /* Store all valid floating-point registers in GDB's register cache |
| 323 | into the process/thread specified by TID. */ |
| 324 | static void |
| 325 | store_fpregs (const struct regcache *regcache, int tid, int regnum) |
| 326 | { |
| 327 | fpregset_t fpregs; |
| 328 | ptrace_area parea; |
| 329 | |
| 330 | parea.len = sizeof (fpregs); |
| 331 | parea.process_addr = (addr_t) &fpregs; |
| 332 | parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs); |
| 333 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0) |
| 334 | perror_with_name (_("Couldn't get floating point status")); |
| 335 | |
| 336 | fill_fpregset (regcache, &fpregs, regnum); |
| 337 | |
| 338 | if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea, 0) < 0) |
| 339 | perror_with_name (_("Couldn't write floating point status")); |
| 340 | } |
| 341 | |
| 342 | /* Fetch all registers in the kernel's register set whose number is |
| 343 | REGSET_ID, whose size is REGSIZE, and whose layout is described by |
| 344 | REGSET, from process/thread TID and store their values in GDB's |
| 345 | register cache. */ |
| 346 | static void |
| 347 | fetch_regset (struct regcache *regcache, int tid, |
| 348 | int regset_id, int regsize, const struct regset *regset) |
| 349 | { |
| 350 | void *buf = alloca (regsize); |
| 351 | struct iovec iov; |
| 352 | |
| 353 | iov.iov_base = buf; |
| 354 | iov.iov_len = regsize; |
| 355 | |
| 356 | if (ptrace (PTRACE_GETREGSET, tid, (long) regset_id, (long) &iov) < 0) |
| 357 | { |
| 358 | if (errno == ENODATA) |
| 359 | regcache_supply_regset (regset, regcache, -1, NULL, regsize); |
| 360 | else |
| 361 | perror_with_name (_("Couldn't get register set")); |
| 362 | } |
| 363 | else |
| 364 | regcache_supply_regset (regset, regcache, -1, buf, regsize); |
| 365 | } |
| 366 | |
| 367 | /* Store all registers in the kernel's register set whose number is |
| 368 | REGSET_ID, whose size is REGSIZE, and whose layout is described by |
| 369 | REGSET, from GDB's register cache back to process/thread TID. */ |
| 370 | static void |
| 371 | store_regset (struct regcache *regcache, int tid, |
| 372 | int regset_id, int regsize, const struct regset *regset) |
| 373 | { |
| 374 | void *buf = alloca (regsize); |
| 375 | struct iovec iov; |
| 376 | |
| 377 | iov.iov_base = buf; |
| 378 | iov.iov_len = regsize; |
| 379 | |
| 380 | if (ptrace (PTRACE_GETREGSET, tid, (long) regset_id, (long) &iov) < 0) |
| 381 | perror_with_name (_("Couldn't get register set")); |
| 382 | |
| 383 | regcache_collect_regset (regset, regcache, -1, buf, regsize); |
| 384 | |
| 385 | if (ptrace (PTRACE_SETREGSET, tid, (long) regset_id, (long) &iov) < 0) |
| 386 | perror_with_name (_("Couldn't set register set")); |
| 387 | } |
| 388 | |
| 389 | /* Check whether the kernel provides a register set with number REGSET |
| 390 | of size REGSIZE for process/thread TID. */ |
| 391 | static int |
| 392 | check_regset (int tid, int regset, int regsize) |
| 393 | { |
| 394 | void *buf = alloca (regsize); |
| 395 | struct iovec iov; |
| 396 | |
| 397 | iov.iov_base = buf; |
| 398 | iov.iov_len = regsize; |
| 399 | |
| 400 | if (ptrace (PTRACE_GETREGSET, tid, (long) regset, (long) &iov) >= 0 |
| 401 | || errno == ENODATA) |
| 402 | return 1; |
| 403 | return 0; |
| 404 | } |
| 405 | |
| 406 | /* Fetch register REGNUM from the child process. If REGNUM is -1, do |
| 407 | this for all registers. */ |
| 408 | void |
| 409 | s390_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum) |
| 410 | { |
| 411 | pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache)); |
| 412 | |
| 413 | if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum)) |
| 414 | fetch_regs (regcache, tid); |
| 415 | |
| 416 | if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum)) |
| 417 | fetch_fpregs (regcache, tid); |
| 418 | |
| 419 | if (have_regset_last_break) |
| 420 | if (regnum == -1 || regnum == S390_LAST_BREAK_REGNUM) |
| 421 | fetch_regset (regcache, tid, NT_S390_LAST_BREAK, 8, |
| 422 | (gdbarch_ptr_bit (regcache->arch ()) == 32 |
| 423 | ? &s390_last_break_regset : &s390x_last_break_regset)); |
| 424 | |
| 425 | if (have_regset_system_call) |
| 426 | if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM) |
| 427 | fetch_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4, |
| 428 | &s390_system_call_regset); |
| 429 | |
| 430 | if (have_regset_tdb) |
| 431 | if (regnum == -1 || S390_IS_TDBREGSET_REGNUM (regnum)) |
| 432 | fetch_regset (regcache, tid, NT_S390_TDB, s390_sizeof_tdbregset, |
| 433 | &s390_tdb_regset); |
| 434 | |
| 435 | if (have_regset_vxrs) |
| 436 | { |
| 437 | if (regnum == -1 || (regnum >= S390_V0_LOWER_REGNUM |
| 438 | && regnum <= S390_V15_LOWER_REGNUM)) |
| 439 | fetch_regset (regcache, tid, NT_S390_VXRS_LOW, 16 * 8, |
| 440 | &s390_vxrs_low_regset); |
| 441 | if (regnum == -1 || (regnum >= S390_V16_REGNUM |
| 442 | && regnum <= S390_V31_REGNUM)) |
| 443 | fetch_regset (regcache, tid, NT_S390_VXRS_HIGH, 16 * 16, |
| 444 | &s390_vxrs_high_regset); |
| 445 | } |
| 446 | |
| 447 | if (have_regset_gs) |
| 448 | { |
| 449 | if (regnum == -1 || (regnum >= S390_GSD_REGNUM |
| 450 | && regnum <= S390_GSEPLA_REGNUM)) |
| 451 | fetch_regset (regcache, tid, NT_S390_GS_CB, 4 * 8, |
| 452 | &s390_gs_regset); |
| 453 | if (regnum == -1 || (regnum >= S390_BC_GSD_REGNUM |
| 454 | && regnum <= S390_BC_GSEPLA_REGNUM)) |
| 455 | fetch_regset (regcache, tid, NT_S390_GS_BC, 4 * 8, |
| 456 | &s390_gsbc_regset); |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | /* Store register REGNUM back into the child process. If REGNUM is |
| 461 | -1, do this for all registers. */ |
| 462 | void |
| 463 | s390_linux_nat_target::store_registers (struct regcache *regcache, int regnum) |
| 464 | { |
| 465 | pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache)); |
| 466 | |
| 467 | if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum)) |
| 468 | store_regs (regcache, tid, regnum); |
| 469 | |
| 470 | if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum)) |
| 471 | store_fpregs (regcache, tid, regnum); |
| 472 | |
| 473 | /* S390_LAST_BREAK_REGNUM is read-only. */ |
| 474 | |
| 475 | if (have_regset_system_call) |
| 476 | if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM) |
| 477 | store_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4, |
| 478 | &s390_system_call_regset); |
| 479 | |
| 480 | if (have_regset_vxrs) |
| 481 | { |
| 482 | if (regnum == -1 || (regnum >= S390_V0_LOWER_REGNUM |
| 483 | && regnum <= S390_V15_LOWER_REGNUM)) |
| 484 | store_regset (regcache, tid, NT_S390_VXRS_LOW, 16 * 8, |
| 485 | &s390_vxrs_low_regset); |
| 486 | if (regnum == -1 || (regnum >= S390_V16_REGNUM |
| 487 | && regnum <= S390_V31_REGNUM)) |
| 488 | store_regset (regcache, tid, NT_S390_VXRS_HIGH, 16 * 16, |
| 489 | &s390_vxrs_high_regset); |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | |
| 494 | /* Hardware-assisted watchpoint handling. */ |
| 495 | |
| 496 | /* For each process we maintain a list of all currently active |
| 497 | watchpoints, in order to properly handle watchpoint removal. |
| 498 | |
| 499 | The only thing we actually need is the total address space area |
| 500 | spanned by the watchpoints. */ |
| 501 | |
| 502 | typedef struct watch_area |
| 503 | { |
| 504 | CORE_ADDR lo_addr; |
| 505 | CORE_ADDR hi_addr; |
| 506 | } s390_watch_area; |
| 507 | |
| 508 | DEF_VEC_O (s390_watch_area); |
| 509 | |
| 510 | /* Hardware debug state. */ |
| 511 | |
| 512 | struct s390_debug_reg_state |
| 513 | { |
| 514 | VEC_s390_watch_area *watch_areas; |
| 515 | VEC_s390_watch_area *break_areas; |
| 516 | }; |
| 517 | |
| 518 | /* Per-process data. */ |
| 519 | |
| 520 | struct s390_process_info |
| 521 | { |
| 522 | struct s390_process_info *next; |
| 523 | pid_t pid; |
| 524 | struct s390_debug_reg_state state; |
| 525 | }; |
| 526 | |
| 527 | static struct s390_process_info *s390_process_list = NULL; |
| 528 | |
| 529 | /* Find process data for process PID. */ |
| 530 | |
| 531 | static struct s390_process_info * |
| 532 | s390_find_process_pid (pid_t pid) |
| 533 | { |
| 534 | struct s390_process_info *proc; |
| 535 | |
| 536 | for (proc = s390_process_list; proc; proc = proc->next) |
| 537 | if (proc->pid == pid) |
| 538 | return proc; |
| 539 | |
| 540 | return NULL; |
| 541 | } |
| 542 | |
| 543 | /* Add process data for process PID. Returns newly allocated info |
| 544 | object. */ |
| 545 | |
| 546 | static struct s390_process_info * |
| 547 | s390_add_process (pid_t pid) |
| 548 | { |
| 549 | struct s390_process_info *proc = XCNEW (struct s390_process_info); |
| 550 | |
| 551 | proc->pid = pid; |
| 552 | proc->next = s390_process_list; |
| 553 | s390_process_list = proc; |
| 554 | |
| 555 | return proc; |
| 556 | } |
| 557 | |
| 558 | /* Get data specific info for process PID, creating it if necessary. |
| 559 | Never returns NULL. */ |
| 560 | |
| 561 | static struct s390_process_info * |
| 562 | s390_process_info_get (pid_t pid) |
| 563 | { |
| 564 | struct s390_process_info *proc; |
| 565 | |
| 566 | proc = s390_find_process_pid (pid); |
| 567 | if (proc == NULL) |
| 568 | proc = s390_add_process (pid); |
| 569 | |
| 570 | return proc; |
| 571 | } |
| 572 | |
| 573 | /* Get hardware debug state for process PID. */ |
| 574 | |
| 575 | static struct s390_debug_reg_state * |
| 576 | s390_get_debug_reg_state (pid_t pid) |
| 577 | { |
| 578 | return &s390_process_info_get (pid)->state; |
| 579 | } |
| 580 | |
| 581 | /* Called whenever GDB is no longer debugging process PID. It deletes |
| 582 | data structures that keep track of hardware debug state. */ |
| 583 | |
| 584 | void |
| 585 | s390_linux_nat_target::low_forget_process (pid_t pid) |
| 586 | { |
| 587 | struct s390_process_info *proc, **proc_link; |
| 588 | |
| 589 | proc = s390_process_list; |
| 590 | proc_link = &s390_process_list; |
| 591 | |
| 592 | while (proc != NULL) |
| 593 | { |
| 594 | if (proc->pid == pid) |
| 595 | { |
| 596 | VEC_free (s390_watch_area, proc->state.watch_areas); |
| 597 | VEC_free (s390_watch_area, proc->state.break_areas); |
| 598 | *proc_link = proc->next; |
| 599 | xfree (proc); |
| 600 | return; |
| 601 | } |
| 602 | |
| 603 | proc_link = &proc->next; |
| 604 | proc = *proc_link; |
| 605 | } |
| 606 | } |
| 607 | |
| 608 | /* linux_nat_new_fork hook. */ |
| 609 | |
| 610 | void |
| 611 | s390_linux_nat_target::low_new_fork (struct lwp_info *parent, pid_t child_pid) |
| 612 | { |
| 613 | pid_t parent_pid; |
| 614 | struct s390_debug_reg_state *parent_state; |
| 615 | struct s390_debug_reg_state *child_state; |
| 616 | |
| 617 | /* NULL means no watchpoint has ever been set in the parent. In |
| 618 | that case, there's nothing to do. */ |
| 619 | if (lwp_arch_private_info (parent) == NULL) |
| 620 | return; |
| 621 | |
| 622 | /* GDB core assumes the child inherits the watchpoints/hw breakpoints of |
| 623 | the parent. So copy the debug state from parent to child. */ |
| 624 | |
| 625 | parent_pid = ptid_get_pid (parent->ptid); |
| 626 | parent_state = s390_get_debug_reg_state (parent_pid); |
| 627 | child_state = s390_get_debug_reg_state (child_pid); |
| 628 | |
| 629 | child_state->watch_areas = VEC_copy (s390_watch_area, |
| 630 | parent_state->watch_areas); |
| 631 | child_state->break_areas = VEC_copy (s390_watch_area, |
| 632 | parent_state->break_areas); |
| 633 | } |
| 634 | |
| 635 | /* Dump PER state. */ |
| 636 | |
| 637 | static void |
| 638 | s390_show_debug_regs (int tid, const char *where) |
| 639 | { |
| 640 | per_struct per_info; |
| 641 | ptrace_area parea; |
| 642 | |
| 643 | parea.len = sizeof (per_info); |
| 644 | parea.process_addr = (addr_t) &per_info; |
| 645 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info); |
| 646 | |
| 647 | if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea, 0) < 0) |
| 648 | perror_with_name (_("Couldn't retrieve debug regs")); |
| 649 | |
| 650 | debug_printf ("PER (debug) state for %d -- %s\n" |
| 651 | " cr9-11: %lx %lx %lx\n" |
| 652 | " start, end: %lx %lx\n" |
| 653 | " code/ATMID: %x address: %lx PAID: %x\n", |
| 654 | tid, |
| 655 | where, |
| 656 | per_info.control_regs.words.cr[0], |
| 657 | per_info.control_regs.words.cr[1], |
| 658 | per_info.control_regs.words.cr[2], |
| 659 | per_info.starting_addr, |
| 660 | per_info.ending_addr, |
| 661 | per_info.lowcore.words.perc_atmid, |
| 662 | per_info.lowcore.words.address, |
| 663 | per_info.lowcore.words.access_id); |
| 664 | } |
| 665 | |
| 666 | bool |
| 667 | s390_linux_nat_target::stopped_by_watchpoint () |
| 668 | { |
| 669 | struct s390_debug_reg_state *state |
| 670 | = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
| 671 | per_lowcore_bits per_lowcore; |
| 672 | ptrace_area parea; |
| 673 | |
| 674 | if (show_debug_regs) |
| 675 | s390_show_debug_regs (s390_inferior_tid (), "stop"); |
| 676 | |
| 677 | /* Speed up common case. */ |
| 678 | if (VEC_empty (s390_watch_area, state->watch_areas)) |
| 679 | return false; |
| 680 | |
| 681 | parea.len = sizeof (per_lowcore); |
| 682 | parea.process_addr = (addr_t) & per_lowcore; |
| 683 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore); |
| 684 | if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea, 0) < 0) |
| 685 | perror_with_name (_("Couldn't retrieve watchpoint status")); |
| 686 | |
| 687 | bool result = (per_lowcore.perc_storage_alteration == 1 |
| 688 | && per_lowcore.perc_store_real_address == 0); |
| 689 | |
| 690 | if (result) |
| 691 | { |
| 692 | /* Do not report this watchpoint again. */ |
| 693 | memset (&per_lowcore, 0, sizeof (per_lowcore)); |
| 694 | if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea, 0) < 0) |
| 695 | perror_with_name (_("Couldn't clear watchpoint status")); |
| 696 | } |
| 697 | |
| 698 | return result; |
| 699 | } |
| 700 | |
| 701 | /* Each time before resuming a thread, update its PER info. */ |
| 702 | |
| 703 | void |
| 704 | s390_linux_nat_target::low_prepare_to_resume (struct lwp_info *lp) |
| 705 | { |
| 706 | int tid; |
| 707 | pid_t pid = ptid_get_pid (ptid_of_lwp (lp)); |
| 708 | |
| 709 | per_struct per_info; |
| 710 | ptrace_area parea; |
| 711 | |
| 712 | CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0; |
| 713 | unsigned ix; |
| 714 | s390_watch_area *area; |
| 715 | struct arch_lwp_info *lp_priv = lwp_arch_private_info (lp); |
| 716 | struct s390_debug_reg_state *state = s390_get_debug_reg_state (pid); |
| 717 | int step = lwp_is_stepping (lp); |
| 718 | |
| 719 | /* Nothing to do if there was never any PER info for this thread. */ |
| 720 | if (lp_priv == NULL) |
| 721 | return; |
| 722 | |
| 723 | /* If PER info has changed, update it. When single-stepping, disable |
| 724 | hardware breakpoints (if any). Otherwise we're done. */ |
| 725 | if (!lp_priv->per_info_changed) |
| 726 | { |
| 727 | if (!step || VEC_empty (s390_watch_area, state->break_areas)) |
| 728 | return; |
| 729 | } |
| 730 | |
| 731 | lp_priv->per_info_changed = 0; |
| 732 | |
| 733 | tid = ptid_get_lwp (ptid_of_lwp (lp)); |
| 734 | if (tid == 0) |
| 735 | tid = pid; |
| 736 | |
| 737 | parea.len = sizeof (per_info); |
| 738 | parea.process_addr = (addr_t) & per_info; |
| 739 | parea.kernel_addr = offsetof (struct user_regs_struct, per_info); |
| 740 | |
| 741 | /* Clear PER info, but adjust the single_step field (used by older |
| 742 | kernels only). */ |
| 743 | memset (&per_info, 0, sizeof (per_info)); |
| 744 | per_info.single_step = (step != 0); |
| 745 | |
| 746 | if (!VEC_empty (s390_watch_area, state->watch_areas)) |
| 747 | { |
| 748 | for (ix = 0; |
| 749 | VEC_iterate (s390_watch_area, state->watch_areas, ix, area); |
| 750 | ix++) |
| 751 | { |
| 752 | watch_lo_addr = std::min (watch_lo_addr, area->lo_addr); |
| 753 | watch_hi_addr = std::max (watch_hi_addr, area->hi_addr); |
| 754 | } |
| 755 | |
| 756 | /* Enable storage-alteration events. */ |
| 757 | per_info.control_regs.words.cr[0] |= (PER_EVENT_STORE |
| 758 | | PER_CONTROL_ALTERATION); |
| 759 | } |
| 760 | |
| 761 | if (!VEC_empty (s390_watch_area, state->break_areas)) |
| 762 | { |
| 763 | /* Don't install hardware breakpoints while single-stepping, since |
| 764 | our PER settings (e.g. the nullification bit) might then conflict |
| 765 | with the kernel's. But re-install them afterwards. */ |
| 766 | if (step) |
| 767 | lp_priv->per_info_changed = 1; |
| 768 | else |
| 769 | { |
| 770 | for (ix = 0; |
| 771 | VEC_iterate (s390_watch_area, state->break_areas, ix, area); |
| 772 | ix++) |
| 773 | { |
| 774 | watch_lo_addr = std::min (watch_lo_addr, area->lo_addr); |
| 775 | watch_hi_addr = std::max (watch_hi_addr, area->hi_addr); |
| 776 | } |
| 777 | |
| 778 | /* If there's just one breakpoint, enable instruction-fetching |
| 779 | nullification events for the breakpoint address (fast). |
| 780 | Otherwise stop after any instruction within the PER area and |
| 781 | after any branch into it (slow). */ |
| 782 | if (watch_hi_addr == watch_lo_addr) |
| 783 | per_info.control_regs.words.cr[0] |= (PER_EVENT_NULLIFICATION |
| 784 | | PER_EVENT_IFETCH); |
| 785 | else |
| 786 | { |
| 787 | /* The PER area must include the instruction before the |
| 788 | first breakpoint address. */ |
| 789 | watch_lo_addr = watch_lo_addr > 6 ? watch_lo_addr - 6 : 0; |
| 790 | per_info.control_regs.words.cr[0] |
| 791 | |= (PER_EVENT_BRANCH |
| 792 | | PER_EVENT_IFETCH |
| 793 | | PER_CONTROL_BRANCH_ADDRESS); |
| 794 | } |
| 795 | } |
| 796 | } |
| 797 | per_info.starting_addr = watch_lo_addr; |
| 798 | per_info.ending_addr = watch_hi_addr; |
| 799 | |
| 800 | if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea, 0) < 0) |
| 801 | perror_with_name (_("Couldn't modify watchpoint status")); |
| 802 | |
| 803 | if (show_debug_regs) |
| 804 | s390_show_debug_regs (tid, "resume"); |
| 805 | } |
| 806 | |
| 807 | /* Mark the PER info as changed, so the next resume will update it. */ |
| 808 | |
| 809 | static void |
| 810 | s390_mark_per_info_changed (struct lwp_info *lp) |
| 811 | { |
| 812 | if (lwp_arch_private_info (lp) == NULL) |
| 813 | lwp_set_arch_private_info (lp, XCNEW (struct arch_lwp_info)); |
| 814 | |
| 815 | lwp_arch_private_info (lp)->per_info_changed = 1; |
| 816 | } |
| 817 | |
| 818 | /* When attaching to a new thread, mark its PER info as changed. */ |
| 819 | |
| 820 | void |
| 821 | s390_linux_nat_target::low_new_thread (struct lwp_info *lp) |
| 822 | { |
| 823 | s390_mark_per_info_changed (lp); |
| 824 | } |
| 825 | |
| 826 | /* Function to call when a thread is being deleted. */ |
| 827 | |
| 828 | void |
| 829 | s390_linux_nat_target::low_delete_thread (struct arch_lwp_info *arch_lwp) |
| 830 | { |
| 831 | xfree (arch_lwp); |
| 832 | } |
| 833 | |
| 834 | /* Iterator callback for s390_refresh_per_info. */ |
| 835 | |
| 836 | static int |
| 837 | s390_refresh_per_info_cb (struct lwp_info *lp, void *arg) |
| 838 | { |
| 839 | s390_mark_per_info_changed (lp); |
| 840 | |
| 841 | if (!lwp_is_stopped (lp)) |
| 842 | linux_stop_lwp (lp); |
| 843 | return 0; |
| 844 | } |
| 845 | |
| 846 | /* Make sure that threads are stopped and mark PER info as changed. */ |
| 847 | |
| 848 | static int |
| 849 | s390_refresh_per_info (void) |
| 850 | { |
| 851 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (current_lwp_ptid ())); |
| 852 | |
| 853 | iterate_over_lwps (pid_ptid, s390_refresh_per_info_cb, NULL); |
| 854 | return 0; |
| 855 | } |
| 856 | |
| 857 | int |
| 858 | s390_linux_nat_target::insert_watchpoint (CORE_ADDR addr, int len, |
| 859 | enum target_hw_bp_type type, |
| 860 | struct expression *cond) |
| 861 | { |
| 862 | s390_watch_area area; |
| 863 | struct s390_debug_reg_state *state |
| 864 | = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
| 865 | |
| 866 | area.lo_addr = addr; |
| 867 | area.hi_addr = addr + len - 1; |
| 868 | VEC_safe_push (s390_watch_area, state->watch_areas, &area); |
| 869 | |
| 870 | return s390_refresh_per_info (); |
| 871 | } |
| 872 | |
| 873 | int |
| 874 | s390_linux_nat_target::remove_watchpoint (CORE_ADDR addr, int len, |
| 875 | enum target_hw_bp_type type, |
| 876 | struct expression *cond) |
| 877 | { |
| 878 | unsigned ix; |
| 879 | s390_watch_area *area; |
| 880 | struct s390_debug_reg_state *state |
| 881 | = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
| 882 | |
| 883 | for (ix = 0; |
| 884 | VEC_iterate (s390_watch_area, state->watch_areas, ix, area); |
| 885 | ix++) |
| 886 | { |
| 887 | if (area->lo_addr == addr && area->hi_addr == addr + len - 1) |
| 888 | { |
| 889 | VEC_unordered_remove (s390_watch_area, state->watch_areas, ix); |
| 890 | return s390_refresh_per_info (); |
| 891 | } |
| 892 | } |
| 893 | |
| 894 | fprintf_unfiltered (gdb_stderr, |
| 895 | "Attempt to remove nonexistent watchpoint.\n"); |
| 896 | return -1; |
| 897 | } |
| 898 | |
| 899 | /* Implement the "can_use_hw_breakpoint" target_ops method. */ |
| 900 | |
| 901 | int |
| 902 | s390_linux_nat_target::can_use_hw_breakpoint (enum bptype type, |
| 903 | int cnt, int othertype) |
| 904 | { |
| 905 | if (type == bp_hardware_watchpoint || type == bp_hardware_breakpoint) |
| 906 | return 1; |
| 907 | return 0; |
| 908 | } |
| 909 | |
| 910 | /* Implement the "insert_hw_breakpoint" target_ops method. */ |
| 911 | |
| 912 | int |
| 913 | s390_linux_nat_target::insert_hw_breakpoint (struct gdbarch *gdbarch, |
| 914 | struct bp_target_info *bp_tgt) |
| 915 | { |
| 916 | s390_watch_area area; |
| 917 | struct s390_debug_reg_state *state; |
| 918 | |
| 919 | area.lo_addr = bp_tgt->placed_address = bp_tgt->reqstd_address; |
| 920 | area.hi_addr = area.lo_addr; |
| 921 | state = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
| 922 | VEC_safe_push (s390_watch_area, state->break_areas, &area); |
| 923 | |
| 924 | return s390_refresh_per_info (); |
| 925 | } |
| 926 | |
| 927 | /* Implement the "remove_hw_breakpoint" target_ops method. */ |
| 928 | |
| 929 | int |
| 930 | s390_linux_nat_target::remove_hw_breakpoint (struct gdbarch *gdbarch, |
| 931 | struct bp_target_info *bp_tgt) |
| 932 | { |
| 933 | unsigned ix; |
| 934 | struct watch_area *area; |
| 935 | struct s390_debug_reg_state *state; |
| 936 | |
| 937 | state = s390_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
| 938 | for (ix = 0; |
| 939 | VEC_iterate (s390_watch_area, state->break_areas, ix, area); |
| 940 | ix++) |
| 941 | { |
| 942 | if (area->lo_addr == bp_tgt->placed_address) |
| 943 | { |
| 944 | VEC_unordered_remove (s390_watch_area, state->break_areas, ix); |
| 945 | return s390_refresh_per_info (); |
| 946 | } |
| 947 | } |
| 948 | |
| 949 | fprintf_unfiltered (gdb_stderr, |
| 950 | "Attempt to remove nonexistent breakpoint.\n"); |
| 951 | return -1; |
| 952 | } |
| 953 | |
| 954 | int |
| 955 | s390_linux_nat_target::region_ok_for_hw_watchpoint (CORE_ADDR addr, int cnt) |
| 956 | { |
| 957 | return 1; |
| 958 | } |
| 959 | |
| 960 | static int |
| 961 | s390_target_wordsize (void) |
| 962 | { |
| 963 | int wordsize = 4; |
| 964 | |
| 965 | /* Check for 64-bit inferior process. This is the case when the host is |
| 966 | 64-bit, and in addition bit 32 of the PSW mask is set. */ |
| 967 | #ifdef __s390x__ |
| 968 | long pswm; |
| 969 | |
| 970 | errno = 0; |
| 971 | pswm = (long) ptrace (PTRACE_PEEKUSER, s390_inferior_tid (), PT_PSWMASK, 0); |
| 972 | if (errno == 0 && (pswm & 0x100000000ul) != 0) |
| 973 | wordsize = 8; |
| 974 | #endif |
| 975 | |
| 976 | return wordsize; |
| 977 | } |
| 978 | |
| 979 | int |
| 980 | s390_linux_nat_target::auxv_parse (gdb_byte **readptr, |
| 981 | gdb_byte *endptr, CORE_ADDR *typep, |
| 982 | CORE_ADDR *valp) |
| 983 | { |
| 984 | int sizeof_auxv_field = s390_target_wordsize (); |
| 985 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 986 | gdb_byte *ptr = *readptr; |
| 987 | |
| 988 | if (endptr == ptr) |
| 989 | return 0; |
| 990 | |
| 991 | if (endptr - ptr < sizeof_auxv_field * 2) |
| 992 | return -1; |
| 993 | |
| 994 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); |
| 995 | ptr += sizeof_auxv_field; |
| 996 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); |
| 997 | ptr += sizeof_auxv_field; |
| 998 | |
| 999 | *readptr = ptr; |
| 1000 | return 1; |
| 1001 | } |
| 1002 | |
| 1003 | const struct target_desc * |
| 1004 | s390_linux_nat_target::read_description () |
| 1005 | { |
| 1006 | int tid = s390_inferior_tid (); |
| 1007 | |
| 1008 | have_regset_last_break |
| 1009 | = check_regset (tid, NT_S390_LAST_BREAK, 8); |
| 1010 | have_regset_system_call |
| 1011 | = check_regset (tid, NT_S390_SYSTEM_CALL, 4); |
| 1012 | |
| 1013 | /* If GDB itself is compiled as 64-bit, we are running on a machine in |
| 1014 | z/Architecture mode. If the target is running in 64-bit addressing |
| 1015 | mode, report s390x architecture. If the target is running in 31-bit |
| 1016 | addressing mode, but the kernel supports using 64-bit registers in |
| 1017 | that mode, report s390 architecture with 64-bit GPRs. */ |
| 1018 | #ifdef __s390x__ |
| 1019 | { |
| 1020 | CORE_ADDR hwcap = 0; |
| 1021 | |
| 1022 | target_auxv_search (target_stack, AT_HWCAP, &hwcap); |
| 1023 | have_regset_tdb = (hwcap & HWCAP_S390_TE) |
| 1024 | && check_regset (tid, NT_S390_TDB, s390_sizeof_tdbregset); |
| 1025 | |
| 1026 | have_regset_vxrs = (hwcap & HWCAP_S390_VX) |
| 1027 | && check_regset (tid, NT_S390_VXRS_LOW, 16 * 8) |
| 1028 | && check_regset (tid, NT_S390_VXRS_HIGH, 16 * 16); |
| 1029 | |
| 1030 | have_regset_gs = (hwcap & HWCAP_S390_GS) |
| 1031 | && check_regset (tid, NT_S390_GS_CB, 4 * 8) |
| 1032 | && check_regset (tid, NT_S390_GS_BC, 4 * 8); |
| 1033 | |
| 1034 | if (s390_target_wordsize () == 8) |
| 1035 | return (have_regset_gs ? tdesc_s390x_gs_linux64 : |
| 1036 | have_regset_vxrs ? |
| 1037 | (have_regset_tdb ? tdesc_s390x_tevx_linux64 : |
| 1038 | tdesc_s390x_vx_linux64) : |
| 1039 | have_regset_tdb ? tdesc_s390x_te_linux64 : |
| 1040 | have_regset_system_call ? tdesc_s390x_linux64v2 : |
| 1041 | have_regset_last_break ? tdesc_s390x_linux64v1 : |
| 1042 | tdesc_s390x_linux64); |
| 1043 | |
| 1044 | if (hwcap & HWCAP_S390_HIGH_GPRS) |
| 1045 | return (have_regset_gs ? tdesc_s390_gs_linux64 : |
| 1046 | have_regset_vxrs ? |
| 1047 | (have_regset_tdb ? tdesc_s390_tevx_linux64 : |
| 1048 | tdesc_s390_vx_linux64) : |
| 1049 | have_regset_tdb ? tdesc_s390_te_linux64 : |
| 1050 | have_regset_system_call ? tdesc_s390_linux64v2 : |
| 1051 | have_regset_last_break ? tdesc_s390_linux64v1 : |
| 1052 | tdesc_s390_linux64); |
| 1053 | } |
| 1054 | #endif |
| 1055 | |
| 1056 | /* If GDB itself is compiled as 31-bit, or if we're running a 31-bit inferior |
| 1057 | on a 64-bit kernel that does not support using 64-bit registers in 31-bit |
| 1058 | mode, report s390 architecture with 32-bit GPRs. */ |
| 1059 | return (have_regset_system_call? tdesc_s390_linux32v2 : |
| 1060 | have_regset_last_break? tdesc_s390_linux32v1 : |
| 1061 | tdesc_s390_linux32); |
| 1062 | } |
| 1063 | |
| 1064 | void |
| 1065 | _initialize_s390_nat (void) |
| 1066 | { |
| 1067 | /* Register the target. */ |
| 1068 | linux_target = &the_s390_linux_nat_target; |
| 1069 | add_inf_child_target (&the_s390_linux_nat_target); |
| 1070 | |
| 1071 | /* A maintenance command to enable showing the PER state. */ |
| 1072 | add_setshow_boolean_cmd ("show-debug-regs", class_maintenance, |
| 1073 | &show_debug_regs, _("\ |
| 1074 | Set whether to show the PER (debug) hardware state."), _("\ |
| 1075 | Show whether to show the PER (debug) hardware state."), _("\ |
| 1076 | Use \"on\" to enable, \"off\" to disable.\n\ |
| 1077 | If enabled, the PER state is shown after it is changed by GDB,\n\ |
| 1078 | and when the inferior triggers a breakpoint or watchpoint."), |
| 1079 | NULL, |
| 1080 | NULL, |
| 1081 | &maintenance_set_cmdlist, |
| 1082 | &maintenance_show_cmdlist); |
| 1083 | } |