gdbserver/linux-s390-ipa.cc

   1 /* GNU/Linux S/390 specific low level interface, for the in-process
   2    agent library for GDB.
   3
   4    Copyright (C) 2016-2020 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "server.h"
  22 #include <sys/mman.h>
  23 #include "tracepoint.h"
  24 #include "linux-s390-tdesc.h"
  25 #include <elf.h>
  26 #ifdef HAVE_GETAUXVAL
  27 #include <sys/auxv.h>
  28 #endif
  29
  30 #define FT_FPR(x) (0x000 + (x) * 0x10)
  31 #define FT_VR(x) (0x000 + (x) * 0x10)
  32 #define FT_VR_L(x) (0x008 + (x) * 0x10)
  33 #define FT_GPR(x) (0x200 + (x) * 8)
  34 #define FT_GPR_U(x) (0x200 + (x) * 8)
  35 #define FT_GPR_L(x) (0x204 + (x) * 8)
  36 #define FT_GPR(x) (0x200 + (x) * 8)
  37 #define FT_ACR(x) (0x280 + (x) * 4)
  38 #define FT_PSWM 0x2c0
  39 #define FT_PSWM_U 0x2c0
  40 #define FT_PSWA 0x2c8
  41 #define FT_PSWA_L 0x2cc
  42 #define FT_FPC 0x2d0
  43
  44 /* Mappings between registers collected by the jump pad and GDB's register
  45    array layout used by regcache.
  46
  47    See linux-s390-low.c (s390_install_fast_tracepoint_jump_pad) for more
  48    details.  */
  49
  50 #ifndef __s390x__
  51
  52 /* Used for s390-linux32, s390-linux32v1, s390-linux32v2.  */
  53
  54 static const int s390_linux32_ft_collect_regmap[] = {
  55   /* 32-bit PSWA and PSWM.  */
  56   FT_PSWM_U, FT_PSWA_L,
  57   /* 32-bit GPRs (mapped to lower halves of 64-bit slots).  */
  58   FT_GPR_L (0), FT_GPR_L (1), FT_GPR_L (2), FT_GPR_L (3),
  59   FT_GPR_L (4), FT_GPR_L (5), FT_GPR_L (6), FT_GPR_L (7),
  60   FT_GPR_L (8), FT_GPR_L (9), FT_GPR_L (10), FT_GPR_L (11),
  61   FT_GPR_L (12), FT_GPR_L (13), FT_GPR_L (14), FT_GPR_L (15),
  62   /* ACRs */
  63   FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
  64   FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
  65   FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
  66   FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
  67   /* FPRs (mapped to upper halves of 128-bit VR slots).  */
  68   FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
  69   FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
  70   FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
  71   FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
  72   /* orig_r2, last_break, system_call */
  73   -1, -1, -1,
  74 };
  75
  76 /* Used for s390-linux64, s390-linux64v1, s390-linux64v2, s390-vx-linux64.  */
  77
  78 static const int s390_linux64_ft_collect_regmap[] = {
  79   /* 32-bit PSWA and PSWM.  */
  80   FT_PSWM_U, FT_PSWA_L,
  81   /* 32-bit halves of 64-bit GPRs.  */
  82   FT_GPR_U (0), FT_GPR_L (0),
  83   FT_GPR_U (1), FT_GPR_L (1),
  84   FT_GPR_U (2), FT_GPR_L (2),
  85   FT_GPR_U (3), FT_GPR_L (3),
  86   FT_GPR_U (4), FT_GPR_L (4),
  87   FT_GPR_U (5), FT_GPR_L (5),
  88   FT_GPR_U (6), FT_GPR_L (6),
  89   FT_GPR_U (7), FT_GPR_L (7),
  90   FT_GPR_U (8), FT_GPR_L (8),
  91   FT_GPR_U (9), FT_GPR_L (9),
  92   FT_GPR_U (10), FT_GPR_L (10),
  93   FT_GPR_U (11), FT_GPR_L (11),
  94   FT_GPR_U (12), FT_GPR_L (12),
  95   FT_GPR_U (13), FT_GPR_L (13),
  96   FT_GPR_U (14), FT_GPR_L (14),
  97   FT_GPR_U (15), FT_GPR_L (15),
  98   /* ACRs */
  99   FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
 100   FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
 101   FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
 102   FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
 103   /* FPRs (mapped to upper halves of 128-bit VR slots).  */
 104   FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
 105   FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
 106   FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
 107   FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
 108   /* orig_r2, last_break, system_call */
 109   -1, -1, -1,
 110   /* Lower halves of 128-bit VRs. */
 111   FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
 112   FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
 113   FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
 114   FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
 115   /* And the next 16 VRs.  */
 116   FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
 117   FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
 118   FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
 119   FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
 120 };
 121
 122 /* Used for s390-te-linux64, s390-tevx-linux64, and s390-gs-linux64.  */
 123
 124 static const int s390_te_linux64_ft_collect_regmap[] = {
 125   /* 32-bit PSWA and PSWM.  */
 126   FT_PSWM_U, FT_PSWA_L,
 127   /* 32-bit halves of 64-bit GPRs.  */
 128   FT_GPR_U (0), FT_GPR_L (0),
 129   FT_GPR_U (1), FT_GPR_L (1),
 130   FT_GPR_U (2), FT_GPR_L (2),
 131   FT_GPR_U (3), FT_GPR_L (3),
 132   FT_GPR_U (4), FT_GPR_L (4),
 133   FT_GPR_U (5), FT_GPR_L (5),
 134   FT_GPR_U (6), FT_GPR_L (6),
 135   FT_GPR_U (7), FT_GPR_L (7),
 136   FT_GPR_U (8), FT_GPR_L (8),
 137   FT_GPR_U (9), FT_GPR_L (9),
 138   FT_GPR_U (10), FT_GPR_L (10),
 139   FT_GPR_U (11), FT_GPR_L (11),
 140   FT_GPR_U (12), FT_GPR_L (12),
 141   FT_GPR_U (13), FT_GPR_L (13),
 142   FT_GPR_U (14), FT_GPR_L (14),
 143   FT_GPR_U (15), FT_GPR_L (15),
 144   /* ACRs */
 145   FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
 146   FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
 147   FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
 148   FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
 149   /* FPRs (mapped to upper halves of 128-bit VR slots).  */
 150   FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
 151   FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
 152   FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
 153   FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
 154   /* orig_r2, last_break, system_call */
 155   -1, -1, -1,
 156   /* TDB */
 157   -1, -1, -1, -1,
 158   -1, -1, -1, -1,
 159   -1, -1, -1, -1,
 160   -1, -1, -1, -1,
 161   -1, -1, -1, -1,
 162   /* Lower halves of 128-bit VRs. */
 163   FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
 164   FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
 165   FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
 166   FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
 167   /* And the next 16 VRs.  */
 168   FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
 169   FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
 170   FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
 171   FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
 172 };
 173
 174 #else /* __s390x__ */
 175
 176 /* Used for s390x-linux64, s390x-linux64v1, s390x-linux64v2, s390x-vx-linux64.  */
 177
 178 static const int s390x_ft_collect_regmap[] = {
 179   /* 64-bit PSWA and PSWM.  */
 180   FT_PSWM, FT_PSWA,
 181   /* 64-bit GPRs.  */
 182   FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3),
 183   FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7),
 184   FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11),
 185   FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15),
 186   /* ACRs */
 187   FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
 188   FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
 189   FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
 190   FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
 191   /* FPRs (mapped to upper halves of 128-bit VR slots).  */
 192   FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
 193   FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
 194   FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
 195   FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
 196   /* orig_r2, last_break, system_call */
 197   -1, -1, -1,
 198   /* Lower halves of 128-bit VRs. */
 199   FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
 200   FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
 201   FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
 202   FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
 203   /* And the next 16 VRs.  */
 204   FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
 205   FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
 206   FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
 207   FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
 208 };
 209
 210 /* Used for s390x-te-linux64, s390x-tevx-linux64, and
 211    s390x-gs-linux64.  */
 212
 213 static const int s390x_te_ft_collect_regmap[] = {
 214   /* 64-bit PSWA and PSWM.  */
 215   FT_PSWM, FT_PSWA,
 216   /* 64-bit GPRs.  */
 217   FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3),
 218   FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7),
 219   FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11),
 220   FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15),
 221   /* ACRs */
 222   FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
 223   FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
 224   FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
 225   FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
 226   /* FPRs (mapped to upper halves of 128-bit VR slots).  */
 227   FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
 228   FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
 229   FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
 230   FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
 231   /* orig_r2, last_break, system_call */
 232   -1, -1, -1,
 233   /* TDB */
 234   -1, -1, -1, -1,
 235   -1, -1, -1, -1,
 236   -1, -1, -1, -1,
 237   -1, -1, -1, -1,
 238   -1, -1, -1, -1,
 239   /* Lower halves of 128-bit VRs. */
 240   FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
 241   FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
 242   FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
 243   FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
 244   /* And the next 16 VRs.  */
 245   FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
 246   FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
 247   FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
 248   FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
 249 };
 250
 251 #endif
 252
 253 /* Initialized by get_ipa_tdesc according to the tdesc in use.  */
 254
 255 static const int *s390_regmap;
 256 static int s390_regnum;
 257
 258 /* Fill in REGCACHE with registers saved by the jump pad in BUF.  */
 259
 260 void
 261 supply_fast_tracepoint_registers (struct regcache *regcache,
 262                                   const unsigned char *buf)
 263 {
 264   int i;
 265   for (i = 0; i < s390_regnum; i++)
 266     if (s390_regmap[i] != -1)
 267       supply_register (regcache, i, ((char *) buf) + s390_regmap[i]);
 268 }
 269
 270 ULONGEST
 271 get_raw_reg (const unsigned char *raw_regs, int regnum)
 272 {
 273   int offset;
 274   if (regnum >= s390_regnum)
 275     return 0;
 276   offset = s390_regmap[regnum];
 277   if (offset == -1)
 278     return 0;
 279
 280   /* The regnums are variable, better to figure out size by FT offset.  */
 281
 282   /* 64-bit ones.  */
 283   if (offset < FT_VR(16)
 284 #ifdef __s390x__
 285       || (offset >= FT_GPR(0) && offset < FT_ACR(0))
 286       || offset == FT_PSWM
 287       || offset == FT_PSWA
 288 #endif
 289      )
 290     return *(uint64_t *) (raw_regs + offset);
 291
 292   if (offset >= FT_ACR(0 && offset < FT_PSWM)
 293       || offset == FT_FPC
 294 #ifndef __s390x__
 295       || (offset >= FT_GPR(0) && offset < FT_ACR(0))
 296       || offset == FT_PSWM_U
 297       || offset == FT_PSWA_L
 298 #endif
 299      )
 300     return *(uint32_t *) (raw_regs + offset);
 301
 302   /* This leaves 128-bit VX.  No way to return them.  */
 303   return 0;
 304 }
 305
 306 /* Return target_desc to use for IPA, given the tdesc index passed by
 307    gdbserver.  For s390, it also sets s390_regmap and s390_regnum.  */
 308
 309 const struct target_desc *
 310 get_ipa_tdesc (int idx)
 311 {
 312 #define SET_REGMAP(regmap, skip_last) \
 313         do { \
 314           s390_regmap = regmap; \
 315           s390_regnum = (sizeof regmap / sizeof regmap[0]) - skip_last; \
 316         } while(0)
 317   switch (idx)
 318     {
 319 #ifdef __s390x__
 320     case S390_TDESC_64:
 321       /* Subtract number of VX regs.  */
 322       SET_REGMAP(s390x_ft_collect_regmap, 32);
 323       return tdesc_s390x_linux64;
 324     case S390_TDESC_64V1:
 325       SET_REGMAP(s390x_ft_collect_regmap, 32);
 326       return tdesc_s390x_linux64v1;
 327     case S390_TDESC_64V2:
 328       SET_REGMAP(s390x_ft_collect_regmap, 32);
 329       return tdesc_s390x_linux64v2;
 330     case S390_TDESC_TE:
 331       SET_REGMAP(s390x_te_ft_collect_regmap, 32);
 332       return tdesc_s390x_te_linux64;
 333     case S390_TDESC_VX:
 334       SET_REGMAP(s390x_ft_collect_regmap, 0);
 335       return tdesc_s390x_vx_linux64;
 336     case S390_TDESC_TEVX:
 337       SET_REGMAP(s390x_te_ft_collect_regmap, 0);
 338       return tdesc_s390x_tevx_linux64;
 339     case S390_TDESC_GS:
 340       SET_REGMAP(s390x_te_ft_collect_regmap, 0);
 341       return tdesc_s390x_gs_linux64;
 342 #else
 343     case S390_TDESC_32:
 344       SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
 345       return tdesc_s390_linux32;
 346     case S390_TDESC_32V1:
 347       SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
 348       return tdesc_s390_linux32v1;
 349     case S390_TDESC_32V2:
 350       SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
 351       return tdesc_s390_linux32v2;
 352     case S390_TDESC_64:
 353       SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
 354       return tdesc_s390_linux64;
 355     case S390_TDESC_64V1:
 356       SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
 357       return tdesc_s390_linux64v1;
 358     case S390_TDESC_64V2:
 359       SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
 360       return tdesc_s390_linux64v2;
 361     case S390_TDESC_TE:
 362       SET_REGMAP(s390_te_linux64_ft_collect_regmap, 32);
 363       return tdesc_s390_te_linux64;
 364     case S390_TDESC_VX:
 365       SET_REGMAP(s390_linux64_ft_collect_regmap, 0);
 366       return tdesc_s390_vx_linux64;
 367     case S390_TDESC_TEVX:
 368       SET_REGMAP(s390_te_linux64_ft_collect_regmap, 0);
 369       return tdesc_s390_tevx_linux64;
 370     case S390_TDESC_GS:
 371       SET_REGMAP(s390_te_linux64_ft_collect_regmap, 0);
 372       return tdesc_s390_gs_linux64;
 373 #endif
 374     default:
 375       internal_error (__FILE__, __LINE__,
 376                       "unknown ipa tdesc index: %d", idx);
 377 #ifdef __s390x__
 378       return tdesc_s390x_linux64;
 379 #else
 380       return tdesc_s390_linux32;
 381 #endif
 382     }
 383 }
 384
 385 /* Allocate buffer for the jump pads.  On 31-bit, JG reaches everywhere,
 386    so just allocate normally.  On 64-bit, we have +/-4GiB of reach, and
 387    the executable is usually mapped at 0x80000000 - aim for somewhere
 388    below it.  */
 389
 390 void *
 391 alloc_jump_pad_buffer (size_t size)
 392 {
 393 #ifdef __s390x__
 394   uintptr_t addr;
 395   uintptr_t exec_base = getauxval (AT_PHDR);
 396   int pagesize;
 397   void *res;
 398
 399   if (exec_base == 0)
 400     exec_base = 0x80000000;
 401
 402   pagesize = sysconf (_SC_PAGE_SIZE);
 403   if (pagesize == -1)
 404     perror_with_name ("sysconf");
 405
 406   addr = exec_base - size;
 407
 408   /* size should already be page-aligned, but this can't hurt.  */
 409   addr &= ~(pagesize - 1);
 410
 411   /* Search for a free area.  If we hit 0, we're out of luck.  */
 412   for (; addr; addr -= pagesize)
 413     {
 414       /* No MAP_FIXED - we don't want to zap someone's mapping.  */
 415       res = mmap ((void *) addr, size,
 416                   PROT_READ | PROT_WRITE | PROT_EXEC,
 417                   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 418
 419       /* If we got what we wanted, return.  */
 420       if ((uintptr_t) res == addr)
 421         return res;
 422
 423       /* If we got a mapping, but at a wrong address, undo it.  */
 424       if (res != MAP_FAILED)
 425         munmap (res, size);
 426     }
 427
 428   return NULL;
 429 #else
 430   void *res = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,
 431                     MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 432
 433   if (res == MAP_FAILED)
 434     return NULL;
 435
 436   return res;
 437 #endif
 438 }
 439
 440 void
 441 initialize_low_tracepoint (void)
 442 {
 443 #ifdef __s390x__
 444   init_registers_s390x_linux64 ();
 445   init_registers_s390x_linux64v1 ();
 446   init_registers_s390x_linux64v2 ();
 447   init_registers_s390x_te_linux64 ();
 448   init_registers_s390x_vx_linux64 ();
 449   init_registers_s390x_tevx_linux64 ();
 450   init_registers_s390x_gs_linux64 ();
 451 #else
 452   init_registers_s390_linux32 ();
 453   init_registers_s390_linux32v1 ();
 454   init_registers_s390_linux32v2 ();
 455   init_registers_s390_linux64 ();
 456   init_registers_s390_linux64v1 ();
 457   init_registers_s390_linux64v2 ();
 458   init_registers_s390_te_linux64 ();
 459   init_registers_s390_vx_linux64 ();
 460   init_registers_s390_tevx_linux64 ();
 461   init_registers_s390_gs_linux64 ();
 462 #endif
 463 }