gdb/xtensa-linux-nat.c

   1 /* Xtensa GNU/Linux native support.
   2
   3    Copyright (C) 2007-2017 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "frame.h"
  22 #include "inferior.h"
  23 #include "gdbcore.h"
  24 #include "regcache.h"
  25 #include "target.h"
  26 #include "linux-nat.h"
  27 #include <sys/types.h>
  28 #include <signal.h>
  29 #include <sys/user.h>
  30 #include <sys/ioctl.h>
  31 #include "gdb_wait.h"
  32 #include <fcntl.h>
  33 #include <sys/procfs.h>
  34 #include "nat/gdb_ptrace.h"
  35 #include <asm/ptrace.h>
  36
  37 #include "gregset.h"
  38 #include "xtensa-tdep.h"
  39
  40 /* Defines ps_err_e, struct ps_prochandle.  */
  41 #include "gdb_proc_service.h"
  42
  43 /* Extended register set depends on hardware configs.
  44    Keeping these definitions separately allows to introduce
  45    hardware-specific overlays.  */
  46 #include "xtensa-xtregs.c"
  47
  48 void
  49 fill_gregset (const struct regcache *regcache,
  50               gdb_gregset_t *gregsetp, int regnum)
  51 {
  52   int i;
  53   xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
  54   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  55
  56   if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
  57     regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
  58   if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
  59     regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
  60
  61   if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
  62     regcache_raw_collect (regcache,
  63                           gdbarch_tdep (gdbarch)->wb_regnum,
  64                           &regs->windowbase);
  65   if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
  66     regcache_raw_collect (regcache,
  67                           gdbarch_tdep (gdbarch)->ws_regnum,
  68                           &regs->windowstart);
  69   if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
  70     regcache_raw_collect (regcache,
  71                           gdbarch_tdep (gdbarch)->lbeg_regnum,
  72                           &regs->lbeg);
  73   if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
  74     regcache_raw_collect (regcache,
  75                           gdbarch_tdep (gdbarch)->lend_regnum,
  76                           &regs->lend);
  77   if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
  78     regcache_raw_collect (regcache,
  79                           gdbarch_tdep (gdbarch)->lcount_regnum,
  80                           &regs->lcount);
  81   if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
  82     regcache_raw_collect (regcache,
  83                           gdbarch_tdep (gdbarch)->sar_regnum,
  84                           &regs->sar);
  85   if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum || regnum == -1)
  86     regcache_raw_collect (regcache,
  87                           gdbarch_tdep (gdbarch)->threadptr_regnum,
  88                           &regs->threadptr);
  89   if (regnum >=gdbarch_tdep (gdbarch)->ar_base
  90       && regnum < gdbarch_tdep (gdbarch)->ar_base
  91                     + gdbarch_tdep (gdbarch)->num_aregs)
  92     regcache_raw_collect (regcache,regnum,
  93                           &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
  94   else if (regnum == -1)
  95     {
  96       for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
  97         regcache_raw_collect (regcache,
  98                               gdbarch_tdep (gdbarch)->ar_base + i,
  99                               &regs->ar[i]);
 100     }
 101   if (regnum >= gdbarch_tdep (gdbarch)->a0_base
 102       && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
 103     regcache_raw_collect (regcache, regnum,
 104                           &regs->ar[(4 * regs->windowbase + regnum
 105                                      - gdbarch_tdep (gdbarch)->a0_base)
 106                           % gdbarch_tdep (gdbarch)->num_aregs]);
 107   else if (regnum == -1)
 108     {
 109       for (i = 0; i < C0_NREGS; ++i)
 110         regcache_raw_collect (regcache,
 111                               gdbarch_tdep (gdbarch)->a0_base + i,
 112                               &regs->ar[(4 * regs->windowbase + i)
 113                               % gdbarch_tdep (gdbarch)->num_aregs]);
 114     }
 115 }
 116
 117 static void
 118 supply_gregset_reg (struct regcache *regcache,
 119                     const gdb_gregset_t *gregsetp, int regnum)
 120 {
 121   int i;
 122   xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
 123
 124   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 125
 126   if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
 127     regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
 128   if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
 129     regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
 130
 131   if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
 132     regcache_raw_supply (regcache,
 133                           gdbarch_tdep (gdbarch)->wb_regnum,
 134                           &regs->windowbase);
 135   if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
 136     regcache_raw_supply (regcache,
 137                           gdbarch_tdep (gdbarch)->ws_regnum,
 138                           &regs->windowstart);
 139   if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
 140     regcache_raw_supply (regcache,
 141                           gdbarch_tdep (gdbarch)->lbeg_regnum,
 142                           &regs->lbeg);
 143   if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
 144     regcache_raw_supply (regcache,
 145                           gdbarch_tdep (gdbarch)->lend_regnum,
 146                           &regs->lend);
 147   if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
 148     regcache_raw_supply (regcache,
 149                           gdbarch_tdep (gdbarch)->lcount_regnum,
 150                           &regs->lcount);
 151   if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
 152     regcache_raw_supply (regcache,
 153                           gdbarch_tdep (gdbarch)->sar_regnum,
 154                           &regs->sar);
 155   if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum || regnum == -1)
 156     regcache_raw_supply (regcache,
 157                           gdbarch_tdep (gdbarch)->threadptr_regnum,
 158                           &regs->threadptr);
 159   if (regnum >=gdbarch_tdep (gdbarch)->ar_base
 160       && regnum < gdbarch_tdep (gdbarch)->ar_base
 161                     + gdbarch_tdep (gdbarch)->num_aregs)
 162     regcache_raw_supply (regcache,regnum,
 163                           &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
 164   else if (regnum == -1)
 165     {
 166       for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
 167         regcache_raw_supply (regcache,
 168                               gdbarch_tdep (gdbarch)->ar_base + i,
 169                               &regs->ar[i]);
 170     }
 171   if (regnum >= gdbarch_tdep (gdbarch)->a0_base
 172       && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
 173     regcache_raw_supply (regcache, regnum,
 174                          &regs->ar[(4 * regs->windowbase + regnum
 175                                     - gdbarch_tdep (gdbarch)->a0_base)
 176                          % gdbarch_tdep (gdbarch)->num_aregs]);
 177   else if (regnum == -1)
 178     {
 179       for (i = 0; i < C0_NREGS; ++i)
 180         regcache_raw_supply (regcache,
 181                              gdbarch_tdep (gdbarch)->a0_base + i,
 182                              &regs->ar[(4 * regs->windowbase + i)
 183                              % gdbarch_tdep (gdbarch)->num_aregs]);
 184     }
 185 }
 186
 187 void
 188 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
 189 {
 190   supply_gregset_reg (regcache, gregsetp, -1);
 191 }
 192
 193 void
 194 fill_fpregset (const struct regcache *regcache,
 195                gdb_fpregset_t *fpregsetp, int regnum)
 196 {
 197   return;
 198 }
 199
 200 void
 201 supply_fpregset (struct regcache *regcache,
 202                  const gdb_fpregset_t *fpregsetp)
 203 {
 204   return;
 205 }
 206
 207 /* Fetch greg-register(s) from process/thread TID
 208    and store value(s) in GDB's register array.  */
 209
 210 static void
 211 fetch_gregs (struct regcache *regcache, int regnum)
 212 {
 213   int tid = ptid_get_lwp (regcache_get_ptid (regcache));
 214   gdb_gregset_t regs;
 215   int areg;
 216
 217   if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 218     {
 219       perror_with_name (_("Couldn't get registers"));
 220       return;
 221     }
 222
 223   supply_gregset_reg (regcache, &regs, regnum);
 224 }
 225
 226 /* Store greg-register(s) in GDB's register
 227    array into the process/thread specified by TID.  */
 228
 229 static void
 230 store_gregs (struct regcache *regcache, int regnum)
 231 {
 232   int tid = ptid_get_lwp (regcache_get_ptid (regcache));
 233   gdb_gregset_t regs;
 234   int areg;
 235
 236   if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 237     {
 238       perror_with_name (_("Couldn't get registers"));
 239       return;
 240     }
 241
 242   fill_gregset (regcache, &regs, regnum);
 243
 244   if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
 245     {
 246       perror_with_name (_("Couldn't write registers"));
 247       return;
 248     }
 249 }
 250
 251 static int xtreg_lo;
 252 static int xtreg_high;
 253
 254 /* Fetch/Store Xtensa TIE registers.  Xtensa GNU/Linux PTRACE
 255    interface provides special requests for this.  */
 256
 257 static void
 258 fetch_xtregs (struct regcache *regcache, int regnum)
 259 {
 260   int tid = ptid_get_lwp (regcache_get_ptid (regcache));
 261   const xtensa_regtable_t *ptr;
 262   char xtregs [XTENSA_ELF_XTREG_SIZE];
 263
 264   if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
 265     perror_with_name (_("Couldn't get extended registers"));
 266
 267   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 268     if (regnum == ptr->gdb_regnum || regnum == -1)
 269       regcache_raw_supply (regcache, ptr->gdb_regnum,
 270                            xtregs + ptr->ptrace_offset);
 271 }
 272
 273 static void
 274 store_xtregs (struct regcache *regcache, int regnum)
 275 {
 276   int tid = ptid_get_lwp (regcache_get_ptid (regcache));
 277   const xtensa_regtable_t *ptr;
 278   char xtregs [XTENSA_ELF_XTREG_SIZE];
 279
 280   if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
 281     perror_with_name (_("Couldn't get extended registers"));
 282
 283   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 284     if (regnum == ptr->gdb_regnum || regnum == -1)
 285       regcache_raw_collect (regcache, ptr->gdb_regnum,
 286                             xtregs + ptr->ptrace_offset);
 287
 288   if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
 289     perror_with_name (_("Couldn't write extended registers"));
 290 }
 291
 292 static void
 293 xtensa_linux_fetch_inferior_registers (struct target_ops *ops,
 294                                        struct regcache *regcache, int regnum)
 295 {
 296   if (regnum == -1)
 297     {
 298       fetch_gregs (regcache, regnum);
 299       fetch_xtregs (regcache, regnum);
 300     }
 301   else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
 302     fetch_gregs (regcache, regnum);
 303   else
 304     fetch_xtregs (regcache, regnum);
 305 }
 306
 307 static void
 308 xtensa_linux_store_inferior_registers (struct target_ops *ops,
 309                                        struct regcache *regcache, int regnum)
 310 {
 311   if (regnum == -1)
 312     {
 313       store_gregs (regcache, regnum);
 314       store_xtregs (regcache, regnum);
 315     }
 316   else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
 317     store_gregs (regcache, regnum);
 318   else
 319     store_xtregs (regcache, regnum);
 320 }
 321
 322 /* Called by libthread_db.  */
 323
 324 ps_err_e
 325 ps_get_thread_area (struct ps_prochandle *ph,
 326                     lwpid_t lwpid, int idx, void **base)
 327 {
 328   xtensa_elf_gregset_t regs;
 329
 330   if (ptrace (PTRACE_GETREGS, lwpid, NULL, &regs) != 0)
 331     return PS_ERR;
 332
 333   /* IDX is the bias from the thread pointer to the beginning of the
 334      thread descriptor.  It has to be subtracted due to implementation
 335      quirks in libthread_db.  */
 336   *base = (void *) ((char *) regs.threadptr - idx);
 337
 338   return PS_OK;
 339 }
 340
 341 void
 342 _initialize_xtensa_linux_nat (void)
 343 {
 344   struct target_ops *t;
 345   const xtensa_regtable_t *ptr;
 346
 347   /* Calculate the number range for extended registers.  */
 348   xtreg_lo = 1000000000;
 349   xtreg_high = -1;
 350   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 351     {
 352       if (ptr->gdb_regnum < xtreg_lo)
 353         xtreg_lo = ptr->gdb_regnum;
 354       if (ptr->gdb_regnum > xtreg_high)
 355         xtreg_high = ptr->gdb_regnum;
 356     }
 357
 358   /* Fill in the generic GNU/Linux methods.  */
 359   t = linux_target ();
 360
 361   /* Add our register access methods.  */
 362   t->to_fetch_registers = xtensa_linux_fetch_inferior_registers;
 363   t->to_store_registers = xtensa_linux_store_inferior_registers;
 364
 365   linux_nat_add_target (t);
 366 }