gdb/xtensa-linux-nat.c

   1 /* Xtensa GNU/Linux native support.
   2
   3    Copyright (C) 2007-2015 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 #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)->ar_base
  86       && regnum < gdbarch_tdep (gdbarch)->ar_base
  87                     + gdbarch_tdep (gdbarch)->num_aregs)
  88     regcache_raw_collect (regcache,regnum,
  89                           &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
  90   else if (regnum == -1)
  91     {
  92       for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
  93         regcache_raw_collect (regcache,
  94                               gdbarch_tdep (gdbarch)->ar_base + i,
  95                               &regs->ar[i]);
  96     }
  97 }
  98
  99 void
 100 supply_gregset_reg (struct regcache *regcache,
 101                     const gdb_gregset_t *gregsetp, int regnum)
 102 {
 103   int i;
 104   xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
 105
 106   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 107
 108   if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
 109     regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
 110   if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
 111     regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
 112
 113   if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
 114     regcache_raw_supply (regcache,
 115                           gdbarch_tdep (gdbarch)->wb_regnum,
 116                           &regs->windowbase);
 117   if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
 118     regcache_raw_supply (regcache,
 119                           gdbarch_tdep (gdbarch)->ws_regnum,
 120                           &regs->windowstart);
 121   if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
 122     regcache_raw_supply (regcache,
 123                           gdbarch_tdep (gdbarch)->lbeg_regnum,
 124                           &regs->lbeg);
 125   if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
 126     regcache_raw_supply (regcache,
 127                           gdbarch_tdep (gdbarch)->lend_regnum,
 128                           &regs->lend);
 129   if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
 130     regcache_raw_supply (regcache,
 131                           gdbarch_tdep (gdbarch)->lcount_regnum,
 132                           &regs->lcount);
 133   if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
 134     regcache_raw_supply (regcache,
 135                           gdbarch_tdep (gdbarch)->sar_regnum,
 136                           &regs->sar);
 137   if (regnum >=gdbarch_tdep (gdbarch)->ar_base
 138       && regnum < gdbarch_tdep (gdbarch)->ar_base
 139                     + gdbarch_tdep (gdbarch)->num_aregs)
 140     regcache_raw_supply (regcache,regnum,
 141                           &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
 142   else if (regnum == -1)
 143     {
 144       for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
 145         regcache_raw_supply (regcache,
 146                               gdbarch_tdep (gdbarch)->ar_base + i,
 147                               &regs->ar[i]);
 148     }
 149 }
 150
 151 void
 152 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
 153 {
 154   supply_gregset_reg (regcache, gregsetp, -1);
 155 }
 156
 157 void
 158 fill_fpregset (const struct regcache *regcache,
 159                gdb_fpregset_t *fpregsetp, int regnum)
 160 {
 161   return;
 162 }
 163
 164 void
 165 supply_fpregset (struct regcache *regcache,
 166                  const gdb_fpregset_t *fpregsetp)
 167 {
 168   return;
 169 }
 170
 171 /* Fetch greg-register(s) from process/thread TID
 172    and store value(s) in GDB's register array.  */
 173
 174 static void
 175 fetch_gregs (struct regcache *regcache, int regnum)
 176 {
 177   int tid = ptid_get_lwp (inferior_ptid);
 178   const gdb_gregset_t regs;
 179   int areg;
 180
 181   if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 182     {
 183       perror_with_name (_("Couldn't get registers"));
 184       return;
 185     }
 186
 187   supply_gregset_reg (regcache, &regs, regnum);
 188 }
 189
 190 /* Store greg-register(s) in GDB's register
 191    array into the process/thread specified by TID.  */
 192
 193 static void
 194 store_gregs (struct regcache *regcache, int regnum)
 195 {
 196   int tid = ptid_get_lwp (inferior_ptid);
 197   gdb_gregset_t regs;
 198   int areg;
 199
 200   if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 201     {
 202       perror_with_name (_("Couldn't get registers"));
 203       return;
 204     }
 205
 206   fill_gregset (regcache, &regs, regnum);
 207
 208   if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
 209     {
 210       perror_with_name (_("Couldn't write registers"));
 211       return;
 212     }
 213 }
 214
 215 static int xtreg_lo;
 216 static int xtreg_high;
 217
 218 /* Fetch/Store Xtensa TIE registers.  Xtensa GNU/Linux PTRACE
 219    interface provides special requests for this.  */
 220
 221 static void
 222 fetch_xtregs (struct regcache *regcache, int regnum)
 223 {
 224   int tid = ptid_get_lwp (inferior_ptid);
 225   const xtensa_regtable_t *ptr;
 226   char xtregs [XTENSA_ELF_XTREG_SIZE];
 227
 228   if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
 229     perror_with_name (_("Couldn't get extended registers"));
 230
 231   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 232     if (regnum == ptr->gdb_regnum || regnum == -1)
 233       regcache_raw_supply (regcache, ptr->gdb_regnum,
 234                            xtregs + ptr->ptrace_offset);
 235 }
 236
 237 static void
 238 store_xtregs (struct regcache *regcache, int regnum)
 239 {
 240   int tid = ptid_get_lwp (inferior_ptid);
 241   const xtensa_regtable_t *ptr;
 242   char xtregs [XTENSA_ELF_XTREG_SIZE];
 243
 244   if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
 245     perror_with_name (_("Couldn't get extended registers"));
 246
 247   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 248     if (regnum == ptr->gdb_regnum || regnum == -1)
 249       regcache_raw_collect (regcache, ptr->gdb_regnum,
 250                             xtregs + ptr->ptrace_offset);
 251
 252   if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
 253     perror_with_name (_("Couldn't write extended registers"));
 254 }
 255
 256 void
 257 xtensa_linux_fetch_inferior_registers (struct target_ops *ops,
 258                                        struct regcache *regcache, int regnum)
 259 {
 260   if (regnum == -1)
 261     {
 262       fetch_gregs (regcache, regnum);
 263       fetch_xtregs (regcache, regnum);
 264     }
 265   else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
 266     fetch_gregs (regcache, regnum);
 267   else
 268     fetch_xtregs (regcache, regnum);
 269 }
 270
 271 void
 272 xtensa_linux_store_inferior_registers (struct target_ops *ops,
 273                                        struct regcache *regcache, int regnum)
 274 {
 275   if (regnum == -1)
 276     {
 277       store_gregs (regcache, regnum);
 278       store_xtregs (regcache, regnum);
 279     }
 280   else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
 281     store_gregs (regcache, regnum);
 282   else
 283     store_xtregs (regcache, regnum);
 284 }
 285
 286 /* Called by libthread_db.  */
 287
 288 ps_err_e
 289 ps_get_thread_area (const struct ps_prochandle *ph,
 290                     lwpid_t lwpid, int idx, void **base)
 291 {
 292   xtensa_elf_gregset_t regs;
 293
 294   if (ptrace (PTRACE_GETREGS, lwpid, NULL, &regs) != 0)
 295     return PS_ERR;
 296
 297   /* IDX is the bias from the thread pointer to the beginning of the
 298      thread descriptor.  It has to be subtracted due to implementation
 299      quirks in libthread_db.  */
 300   *base = (void *) ((char *) regs.threadptr - idx);
 301
 302   return PS_OK;
 303 }
 304
 305 void _initialize_xtensa_linux_nat (void);
 306
 307 void
 308 _initialize_xtensa_linux_nat (void)
 309 {
 310   struct target_ops *t;
 311   const xtensa_regtable_t *ptr;
 312
 313   /* Calculate the number range for extended registers.  */
 314   xtreg_lo = 1000000000;
 315   xtreg_high = -1;
 316   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 317     {
 318       if (ptr->gdb_regnum < xtreg_lo)
 319         xtreg_lo = ptr->gdb_regnum;
 320       if (ptr->gdb_regnum > xtreg_high)
 321         xtreg_high = ptr->gdb_regnum;
 322     }
 323
 324   /* Fill in the generic GNU/Linux methods.  */
 325   t = linux_target ();
 326
 327   /* Add our register access methods.  */
 328   t->to_fetch_registers = xtensa_linux_fetch_inferior_registers;
 329   t->to_store_registers = xtensa_linux_store_inferior_registers;
 330
 331   linux_nat_add_target (t);
 332 }