gdb/gdbserver/linux-s390-low.c

   1 /* GNU/Linux S/390 specific low level interface, for the remote server
   2    for GDB.
   3    Copyright (C) 2001-2015 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 /* This file is used for both 31-bit and 64-bit S/390 systems.  */
  21
  22 #include "server.h"
  23 #include "linux-low.h"
  24 #include "elf/common.h"
  25
  26 #include <asm/ptrace.h>
  27 #include "nat/gdb_ptrace.h"
  28 #include <sys/uio.h>
  29 #include <elf.h>
  30
  31 #ifndef HWCAP_S390_HIGH_GPRS
  32 #define HWCAP_S390_HIGH_GPRS 512
  33 #endif
  34
  35 #ifndef HWCAP_S390_TE
  36 #define HWCAP_S390_TE 1024
  37 #endif
  38
  39 #ifndef HWCAP_S390_VX
  40 #define HWCAP_S390_VX 2048
  41 #endif
  42
  43 /* Defined in auto-generated file s390-linux32.c.  */
  44 void init_registers_s390_linux32 (void);
  45 extern const struct target_desc *tdesc_s390_linux32;
  46
  47 /* Defined in auto-generated file s390-linux32v1.c.  */
  48 void init_registers_s390_linux32v1 (void);
  49 extern const struct target_desc *tdesc_s390_linux32v1;
  50
  51 /* Defined in auto-generated file s390-linux32v2.c.  */
  52 void init_registers_s390_linux32v2 (void);
  53 extern const struct target_desc *tdesc_s390_linux32v2;
  54
  55 /* Defined in auto-generated file s390-linux64.c.  */
  56 void init_registers_s390_linux64 (void);
  57 extern const struct target_desc *tdesc_s390_linux64;
  58
  59 /* Defined in auto-generated file s390-linux64v1.c.  */
  60 void init_registers_s390_linux64v1 (void);
  61 extern const struct target_desc *tdesc_s390_linux64v1;
  62
  63 /* Defined in auto-generated file s390-linux64v2.c.  */
  64 void init_registers_s390_linux64v2 (void);
  65 extern const struct target_desc *tdesc_s390_linux64v2;
  66
  67 /* Defined in auto-generated file s390-te-linux64.c.  */
  68 void init_registers_s390_te_linux64 (void);
  69 extern const struct target_desc *tdesc_s390_te_linux64;
  70
  71 /* Defined in auto-generated file s390-vx-linux64.c.  */
  72 void init_registers_s390_vx_linux64 (void);
  73 extern const struct target_desc *tdesc_s390_vx_linux64;
  74
  75 /* Defined in auto-generated file s390-tevx-linux64.c.  */
  76 void init_registers_s390_tevx_linux64 (void);
  77 extern const struct target_desc *tdesc_s390_tevx_linux64;
  78
  79 /* Defined in auto-generated file s390x-linux64.c.  */
  80 void init_registers_s390x_linux64 (void);
  81 extern const struct target_desc *tdesc_s390x_linux64;
  82
  83 /* Defined in auto-generated file s390x-linux64v1.c.  */
  84 void init_registers_s390x_linux64v1 (void);
  85 extern const struct target_desc *tdesc_s390x_linux64v1;
  86
  87 /* Defined in auto-generated file s390x-linux64v2.c.  */
  88 void init_registers_s390x_linux64v2 (void);
  89 extern const struct target_desc *tdesc_s390x_linux64v2;
  90
  91 /* Defined in auto-generated file s390x-te-linux64.c.  */
  92 void init_registers_s390x_te_linux64 (void);
  93 extern const struct target_desc *tdesc_s390x_te_linux64;
  94
  95 /* Defined in auto-generated file s390x-vx-linux64.c.  */
  96 void init_registers_s390x_vx_linux64 (void);
  97 extern const struct target_desc *tdesc_s390x_vx_linux64;
  98
  99 /* Defined in auto-generated file s390x-tevx-linux64.c.  */
 100 void init_registers_s390x_tevx_linux64 (void);
 101 extern const struct target_desc *tdesc_s390x_tevx_linux64;
 102
 103 #define s390_num_regs 52
 104
 105 static int s390_regmap[] = {
 106   PT_PSWMASK, PT_PSWADDR,
 107
 108   PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
 109   PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
 110   PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
 111   PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,
 112
 113   PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
 114   PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
 115   PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
 116   PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
 117
 118   PT_FPC,
 119
 120 #ifndef __s390x__
 121   PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
 122   PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
 123   PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
 124   PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
 125 #else
 126   PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
 127   PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
 128   PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
 129   PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
 130 #endif
 131
 132   PT_ORIGGPR2,
 133 };
 134
 135 #ifdef __s390x__
 136 #define s390_num_regs_3264 68
 137
 138 static int s390_regmap_3264[] = {
 139   PT_PSWMASK, PT_PSWADDR,
 140
 141   PT_GPR0, PT_GPR0, PT_GPR1, PT_GPR1,
 142   PT_GPR2, PT_GPR2, PT_GPR3, PT_GPR3,
 143   PT_GPR4, PT_GPR4, PT_GPR5, PT_GPR5,
 144   PT_GPR6, PT_GPR6, PT_GPR7, PT_GPR7,
 145   PT_GPR8, PT_GPR8, PT_GPR9, PT_GPR9,
 146   PT_GPR10, PT_GPR10, PT_GPR11, PT_GPR11,
 147   PT_GPR12, PT_GPR12, PT_GPR13, PT_GPR13,
 148   PT_GPR14, PT_GPR14, PT_GPR15, PT_GPR15,
 149
 150   PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
 151   PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
 152   PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
 153   PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
 154
 155   PT_FPC,
 156
 157   PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
 158   PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
 159   PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
 160   PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
 161
 162   PT_ORIGGPR2,
 163 };
 164 #endif
 165
 166
 167 static int
 168 s390_cannot_fetch_register (int regno)
 169 {
 170   return 0;
 171 }
 172
 173 static int
 174 s390_cannot_store_register (int regno)
 175 {
 176   return 0;
 177 }
 178
 179 static void
 180 s390_collect_ptrace_register (struct regcache *regcache, int regno, char *buf)
 181 {
 182   int size = register_size (regcache->tdesc, regno);
 183   if (size < sizeof (long))
 184     {
 185       const struct regs_info *regs_info = (*the_low_target.regs_info) ();
 186       struct usrregs_info *usr = regs_info->usrregs;
 187       int regaddr = usr->regmap[regno];
 188
 189       memset (buf, 0, sizeof (long));
 190
 191       if ((regno ^ 1) < usr->num_regs
 192           && usr->regmap[regno ^ 1] == regaddr)
 193         {
 194           collect_register (regcache, regno & ~1, buf);
 195           collect_register (regcache, (regno & ~1) + 1,
 196                             buf + sizeof (long) - size);
 197         }
 198       else if (regaddr == PT_PSWMASK)
 199         {
 200           /* Convert 4-byte PSW mask to 8 bytes by clearing bit 12 and copying
 201              the basic addressing mode bit from the PSW address.  */
 202           char *addr = alloca (register_size (regcache->tdesc, regno ^ 1));
 203           collect_register (regcache, regno, buf);
 204           collect_register (regcache, regno ^ 1, addr);
 205           buf[1] &= ~0x8;
 206           buf[size] |= (addr[0] & 0x80);
 207         }
 208       else if (regaddr == PT_PSWADDR)
 209         {
 210           /* Convert 4-byte PSW address to 8 bytes by clearing the addressing
 211              mode bit (which gets copied to the PSW mask instead).  */
 212           collect_register (regcache, regno, buf + sizeof (long) - size);
 213           buf[sizeof (long) - size] &= ~0x80;
 214         }
 215       else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
 216                || regaddr == PT_ORIGGPR2)
 217         collect_register (regcache, regno, buf + sizeof (long) - size);
 218       else
 219         collect_register (regcache, regno, buf);
 220     }
 221   else
 222     collect_register (regcache, regno, buf);
 223 }
 224
 225 static void
 226 s390_supply_ptrace_register (struct regcache *regcache,
 227                              int regno, const char *buf)
 228 {
 229   int size = register_size (regcache->tdesc, regno);
 230   if (size < sizeof (long))
 231     {
 232       const struct regs_info *regs_info = (*the_low_target.regs_info) ();
 233       struct usrregs_info *usr = regs_info->usrregs;
 234       int regaddr = usr->regmap[regno];
 235
 236       if ((regno ^ 1) < usr->num_regs
 237           && usr->regmap[regno ^ 1] == regaddr)
 238         {
 239           supply_register (regcache, regno & ~1, buf);
 240           supply_register (regcache, (regno & ~1) + 1,
 241                            buf + sizeof (long) - size);
 242         }
 243       else if (regaddr == PT_PSWMASK)
 244         {
 245           /* Convert 8-byte PSW mask to 4 bytes by setting bit 12 and copying
 246              the basic addressing mode into the PSW address.  */
 247           char *mask = alloca (size);
 248           char *addr = alloca (register_size (regcache->tdesc, regno ^ 1));
 249           memcpy (mask, buf, size);
 250           mask[1] |= 0x8;
 251           supply_register (regcache, regno, mask);
 252
 253           collect_register (regcache, regno ^ 1, addr);
 254           addr[0] &= ~0x80;
 255           addr[0] |= (buf[size] & 0x80);
 256           supply_register (regcache, regno ^ 1, addr);
 257         }
 258       else if (regaddr == PT_PSWADDR)
 259         {
 260           /* Convert 8-byte PSW address to 4 bytes by truncating, but
 261              keeping the addressing mode bit (which was set from the mask).  */
 262           char *addr = alloca (size);
 263           char amode;
 264           collect_register (regcache, regno, addr);
 265           amode = addr[0] & 0x80;
 266           memcpy (addr, buf + sizeof (long) - size, size);
 267           addr[0] &= ~0x80;
 268           addr[0] |= amode;
 269           supply_register (regcache, regno, addr);
 270         }
 271       else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
 272                || regaddr == PT_ORIGGPR2)
 273         supply_register (regcache, regno, buf + sizeof (long) - size);
 274       else
 275         supply_register (regcache, regno, buf);
 276     }
 277   else
 278     supply_register (regcache, regno, buf);
 279 }
 280
 281 /* Provide only a fill function for the general register set.  ps_lgetregs
 282    will use this for NPTL support.  */
 283
 284 static void
 285 s390_fill_gregset (struct regcache *regcache, void *buf)
 286 {
 287   int i;
 288   const struct regs_info *regs_info = (*the_low_target.regs_info) ();
 289   struct usrregs_info *usr = regs_info->usrregs;
 290
 291   for (i = 0; i < usr->num_regs; i++)
 292     {
 293       if (usr->regmap[i] < PT_PSWMASK
 294           || usr->regmap[i] > PT_ACR15)
 295         continue;
 296
 297       s390_collect_ptrace_register (regcache, i,
 298                                     (char *) buf + usr->regmap[i]);
 299     }
 300 }
 301
 302 /* Fill and store functions for extended register sets.  */
 303
 304 static void
 305 s390_store_last_break (struct regcache *regcache, const void *buf)
 306 {
 307   const char *p;
 308
 309   p = (const char *) buf + 8 - register_size (regcache->tdesc, 0);
 310   supply_register_by_name (regcache, "last_break", p);
 311 }
 312
 313 static void
 314 s390_fill_system_call (struct regcache *regcache, void *buf)
 315 {
 316   collect_register_by_name (regcache, "system_call", buf);
 317 }
 318
 319 static void
 320 s390_store_system_call (struct regcache *regcache, const void *buf)
 321 {
 322   supply_register_by_name (regcache, "system_call", buf);
 323 }
 324
 325 static void
 326 s390_store_tdb (struct regcache *regcache, const void *buf)
 327 {
 328   int tdb0 = find_regno (regcache->tdesc, "tdb0");
 329   int tr0 = find_regno (regcache->tdesc, "tr0");
 330   int i;
 331
 332   for (i = 0; i < 4; i++)
 333     supply_register (regcache, tdb0 + i, (const char *) buf + 8 * i);
 334
 335   for (i = 0; i < 16; i++)
 336     supply_register (regcache, tr0 + i, (const char *) buf + 8 * (16 + i));
 337 }
 338
 339 static void
 340 s390_fill_vxrs_low (struct regcache *regcache, void *buf)
 341 {
 342   int v0 = find_regno (regcache->tdesc, "v0l");
 343   int i;
 344
 345   for (i = 0; i < 16; i++)
 346     collect_register (regcache, v0 + i, (char *) buf + 8 * i);
 347 }
 348
 349 static void
 350 s390_store_vxrs_low (struct regcache *regcache, const void *buf)
 351 {
 352   int v0 = find_regno (regcache->tdesc, "v0l");
 353   int i;
 354
 355   for (i = 0; i < 16; i++)
 356     supply_register (regcache, v0 + i, (const char *) buf + 8 * i);
 357 }
 358
 359 static void
 360 s390_fill_vxrs_high (struct regcache *regcache, void *buf)
 361 {
 362   int v16 = find_regno (regcache->tdesc, "v16");
 363   int i;
 364
 365   for (i = 0; i < 16; i++)
 366     collect_register (regcache, v16 + i, (char *) buf + 16 * i);
 367 }
 368
 369 static void
 370 s390_store_vxrs_high (struct regcache *regcache, const void *buf)
 371 {
 372   int v16 = find_regno (regcache->tdesc, "v16");
 373   int i;
 374
 375   for (i = 0; i < 16; i++)
 376     supply_register (regcache, v16 + i, (const char *) buf + 16 * i);
 377 }
 378
 379 static struct regset_info s390_regsets[] = {
 380   { 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
 381   /* Last break address is read-only; no fill function.  */
 382   { PTRACE_GETREGSET, -1, NT_S390_LAST_BREAK, 0, EXTENDED_REGS,
 383     NULL, s390_store_last_break },
 384   { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_SYSTEM_CALL, 0,
 385     EXTENDED_REGS, s390_fill_system_call, s390_store_system_call },
 386   /* TDB is read-only.  */
 387   { PTRACE_GETREGSET, -1, NT_S390_TDB, 0, EXTENDED_REGS,
 388     NULL, s390_store_tdb },
 389   { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_VXRS_LOW, 0,
 390     EXTENDED_REGS, s390_fill_vxrs_low, s390_store_vxrs_low },
 391   { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_VXRS_HIGH, 0,
 392     EXTENDED_REGS, s390_fill_vxrs_high, s390_store_vxrs_high },
 393   { 0, 0, 0, -1, -1, NULL, NULL }
 394 };
 395
 396
 397 static const unsigned char s390_breakpoint[] = { 0, 1 };
 398 #define s390_breakpoint_len 2
 399
 400 static CORE_ADDR
 401 s390_get_pc (struct regcache *regcache)
 402 {
 403   if (register_size (regcache->tdesc, 0) == 4)
 404     {
 405       unsigned int pswa;
 406       collect_register_by_name (regcache, "pswa", &pswa);
 407       return pswa & 0x7fffffff;
 408     }
 409   else
 410     {
 411       unsigned long pc;
 412       collect_register_by_name (regcache, "pswa", &pc);
 413       return pc;
 414     }
 415 }
 416
 417 static void
 418 s390_set_pc (struct regcache *regcache, CORE_ADDR newpc)
 419 {
 420   if (register_size (regcache->tdesc, 0) == 4)
 421     {
 422       unsigned int pswa;
 423       collect_register_by_name (regcache, "pswa", &pswa);
 424       pswa = (pswa & 0x80000000) | (newpc & 0x7fffffff);
 425       supply_register_by_name (regcache, "pswa", &pswa);
 426     }
 427   else
 428     {
 429       unsigned long pc = newpc;
 430       supply_register_by_name (regcache, "pswa", &pc);
 431     }
 432 }
 433
 434 #ifdef __s390x__
 435 static unsigned long
 436 s390_get_hwcap (const struct target_desc *tdesc)
 437 {
 438   int wordsize = register_size (tdesc, 0);
 439   unsigned char *data = alloca (2 * wordsize);
 440   int offset = 0;
 441
 442   while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize)
 443     {
 444       if (wordsize == 4)
 445         {
 446           unsigned int *data_p = (unsigned int *)data;
 447           if (data_p[0] == AT_HWCAP)
 448             return data_p[1];
 449         }
 450       else
 451         {
 452           unsigned long *data_p = (unsigned long *)data;
 453           if (data_p[0] == AT_HWCAP)
 454             return data_p[1];
 455         }
 456
 457       offset += 2 * wordsize;
 458     }
 459
 460   return 0;
 461 }
 462 #endif
 463
 464 static int
 465 s390_check_regset (int pid, int regset, int regsize)
 466 {
 467   gdb_byte *buf = alloca (regsize);
 468   struct iovec iov;
 469
 470   iov.iov_base = buf;
 471   iov.iov_len = regsize;
 472
 473   if (ptrace (PTRACE_GETREGSET, pid, (long) regset, (long) &iov) >= 0
 474       || errno == ENODATA)
 475     return 1;
 476   return 0;
 477 }
 478
 479 #ifdef __s390x__
 480 /* For a 31-bit inferior, whether the kernel supports using the full
 481    64-bit GPRs.  */
 482 static int have_hwcap_s390_high_gprs = 0;
 483 #endif
 484
 485 static void
 486 s390_arch_setup (void)
 487 {
 488   const struct target_desc *tdesc;
 489   struct regset_info *regset;
 490
 491   /* Check whether the kernel supports extra register sets.  */
 492   int pid = pid_of (current_thread);
 493   int have_regset_last_break
 494     = s390_check_regset (pid, NT_S390_LAST_BREAK, 8);
 495   int have_regset_system_call
 496     = s390_check_regset (pid, NT_S390_SYSTEM_CALL, 4);
 497   int have_regset_tdb = s390_check_regset (pid, NT_S390_TDB, 256);
 498   int have_regset_vxrs = s390_check_regset (pid, NT_S390_VXRS_LOW, 128)
 499     && s390_check_regset (pid, NT_S390_VXRS_HIGH, 256);
 500
 501   /* Assume 31-bit inferior process.  */
 502   if (have_regset_system_call)
 503     tdesc = tdesc_s390_linux32v2;
 504   else if (have_regset_last_break)
 505     tdesc = tdesc_s390_linux32v1;
 506   else
 507     tdesc = tdesc_s390_linux32;
 508
 509   /* On a 64-bit host, check the low bit of the (31-bit) PSWM
 510      -- if this is one, we actually have a 64-bit inferior.  */
 511 #ifdef __s390x__
 512   {
 513     unsigned int pswm;
 514     struct regcache *regcache = new_register_cache (tdesc);
 515
 516     fetch_inferior_registers (regcache, find_regno (tdesc, "pswm"));
 517     collect_register_by_name (regcache, "pswm", &pswm);
 518     free_register_cache (regcache);
 519
 520     if (pswm & 1)
 521       {
 522         if (have_regset_tdb)
 523           have_regset_tdb =
 524             (s390_get_hwcap (tdesc_s390x_linux64v2) & HWCAP_S390_TE) != 0;
 525         if (have_regset_vxrs)
 526           have_regset_vxrs =
 527             (s390_get_hwcap (tdesc_s390x_linux64v2) & HWCAP_S390_VX) != 0;
 528
 529         if (have_regset_vxrs)
 530           tdesc = (have_regset_tdb ? tdesc_s390x_tevx_linux64 :
 531                    tdesc_s390x_vx_linux64);
 532         else if (have_regset_tdb)
 533           tdesc = tdesc_s390x_te_linux64;
 534         else if (have_regset_system_call)
 535           tdesc = tdesc_s390x_linux64v2;
 536         else if (have_regset_last_break)
 537           tdesc = tdesc_s390x_linux64v1;
 538         else
 539           tdesc = tdesc_s390x_linux64;
 540       }
 541
 542     /* For a 31-bit inferior, check whether the kernel supports
 543        using the full 64-bit GPRs.  */
 544     else if (s390_get_hwcap (tdesc) & HWCAP_S390_HIGH_GPRS)
 545       {
 546         have_hwcap_s390_high_gprs = 1;
 547         if (have_regset_tdb)
 548           have_regset_tdb = (s390_get_hwcap (tdesc) & HWCAP_S390_TE) != 0;
 549         if (have_regset_vxrs)
 550           have_regset_vxrs = (s390_get_hwcap (tdesc) & HWCAP_S390_VX) != 0;
 551
 552         if (have_regset_vxrs)
 553           tdesc = (have_regset_tdb ? tdesc_s390_tevx_linux64 :
 554                    tdesc_s390_vx_linux64);
 555         else if (have_regset_tdb)
 556           tdesc = tdesc_s390_te_linux64;
 557         else if (have_regset_system_call)
 558           tdesc = tdesc_s390_linux64v2;
 559         else if (have_regset_last_break)
 560           tdesc = tdesc_s390_linux64v1;
 561         else
 562           tdesc = tdesc_s390_linux64;
 563       }
 564   }
 565 #endif
 566
 567   /* Update target_regsets according to available register sets.  */
 568   for (regset = s390_regsets; regset->size >= 0; regset++)
 569     if (regset->get_request == PTRACE_GETREGSET)
 570       switch (regset->nt_type)
 571         {
 572         case NT_S390_LAST_BREAK:
 573           regset->size = have_regset_last_break? 8 : 0;
 574           break;
 575         case NT_S390_SYSTEM_CALL:
 576           regset->size = have_regset_system_call? 4 : 0;
 577           break;
 578         case NT_S390_TDB:
 579           regset->size = have_regset_tdb ? 256 : 0;
 580           break;
 581         case NT_S390_VXRS_LOW:
 582           regset->size = have_regset_vxrs ? 128 : 0;
 583           break;
 584         case NT_S390_VXRS_HIGH:
 585           regset->size = have_regset_vxrs ? 256 : 0;
 586           break;
 587         default:
 588           break;
 589         }
 590
 591   current_process ()->tdesc = tdesc;
 592 }
 593
 594
 595 static int
 596 s390_breakpoint_at (CORE_ADDR pc)
 597 {
 598   unsigned char c[s390_breakpoint_len];
 599   read_inferior_memory (pc, c, s390_breakpoint_len);
 600   return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
 601 }
 602
 603 static struct usrregs_info s390_usrregs_info =
 604   {
 605     s390_num_regs,
 606     s390_regmap,
 607   };
 608
 609 static struct regsets_info s390_regsets_info =
 610   {
 611     s390_regsets, /* regsets */
 612     0, /* num_regsets */
 613     NULL, /* disabled_regsets */
 614   };
 615
 616 static struct regs_info regs_info =
 617   {
 618     NULL, /* regset_bitmap */
 619     &s390_usrregs_info,
 620     &s390_regsets_info
 621   };
 622
 623 #ifdef __s390x__
 624 static struct usrregs_info s390_usrregs_info_3264 =
 625   {
 626     s390_num_regs_3264,
 627     s390_regmap_3264
 628   };
 629
 630 static struct regsets_info s390_regsets_info_3264 =
 631   {
 632     s390_regsets, /* regsets */
 633     0, /* num_regsets */
 634     NULL, /* disabled_regsets */
 635   };
 636
 637 static struct regs_info regs_info_3264 =
 638   {
 639     NULL, /* regset_bitmap */
 640     &s390_usrregs_info_3264,
 641     &s390_regsets_info_3264
 642   };
 643 #endif
 644
 645 static const struct regs_info *
 646 s390_regs_info (void)
 647 {
 648 #ifdef __s390x__
 649   if (have_hwcap_s390_high_gprs)
 650     {
 651       const struct target_desc *tdesc = current_process ()->tdesc;
 652
 653       if (register_size (tdesc, 0) == 4)
 654         return &regs_info_3264;
 655     }
 656 #endif
 657   return &regs_info;
 658 }
 659
 660 struct linux_target_ops the_low_target = {
 661   s390_arch_setup,
 662   s390_regs_info,
 663   s390_cannot_fetch_register,
 664   s390_cannot_store_register,
 665   NULL, /* fetch_register */
 666   s390_get_pc,
 667   s390_set_pc,
 668   s390_breakpoint,
 669   s390_breakpoint_len,
 670   NULL,
 671   s390_breakpoint_len,
 672   s390_breakpoint_at,
 673   NULL,  /* supports_z_point_type */
 674   NULL,
 675   NULL,
 676   NULL,
 677   NULL,
 678   s390_collect_ptrace_register,
 679   s390_supply_ptrace_register,
 680 };
 681
 682 void
 683 initialize_low_arch (void)
 684 {
 685   /* Initialize the Linux target descriptions.  */
 686
 687   init_registers_s390_linux32 ();
 688   init_registers_s390_linux32v1 ();
 689   init_registers_s390_linux32v2 ();
 690   init_registers_s390_linux64 ();
 691   init_registers_s390_linux64v1 ();
 692   init_registers_s390_linux64v2 ();
 693   init_registers_s390_te_linux64 ();
 694   init_registers_s390_vx_linux64 ();
 695   init_registers_s390_tevx_linux64 ();
 696   init_registers_s390x_linux64 ();
 697   init_registers_s390x_linux64v1 ();
 698   init_registers_s390x_linux64v2 ();
 699   init_registers_s390x_te_linux64 ();
 700   init_registers_s390x_vx_linux64 ();
 701   init_registers_s390x_tevx_linux64 ();
 702
 703   initialize_regsets_info (&s390_regsets_info);
 704 #ifdef __s390x__
 705   initialize_regsets_info (&s390_regsets_info_3264);
 706 #endif
 707 }