gdb/xtensa-linux-nat.c

   1 /* Xtensa GNU/Linux native support.
   2
   3    Copyright (C) 2007-2012 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 "gdb_string.h"
  22 #include "frame.h"
  23 #include "inferior.h"
  24 #include "gdbcore.h"
  25 #include "regcache.h"
  26 #include "gdb_assert.h"
  27 #include "target.h"
  28 #include "linux-nat.h"
  29
  30 #include <stdint.h>
  31 #include <sys/types.h>
  32 #include <sys/param.h>
  33 #include <signal.h>
  34 #include <sys/user.h>
  35 #include <sys/ioctl.h>
  36 #include "gdb_wait.h"
  37 #include <fcntl.h>
  38 #include <sys/procfs.h>
  39 #include <sys/ptrace.h>
  40
  41 #include "gregset.h"
  42 #include "xtensa-tdep.h"
  43
  44 /* Extended register set depends on hardware configs.
  45    Keeping these definitions separately allows to introduce
  46    hardware-specific overlays.  */
  47 #include "xtensa-xtregs.c"
  48
  49 static int
  50 get_thread_id (ptid_t ptid)
  51 {
  52   int tid = TIDGET (ptid);
  53   if (0 == tid)
  54     tid = PIDGET (ptid);
  55   return tid;
  56 }
  57 #define GET_THREAD_ID(PTID)     get_thread_id (PTID)
  58
  59 void
  60 fill_gregset (const struct regcache *regcache,
  61               gdb_gregset_t *gregsetp, int regnum)
  62 {
  63   int i;
  64   xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
  65   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  66
  67   if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
  68     regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
  69   if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
  70     regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
  71
  72   if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
  73     regcache_raw_collect (regcache,
  74                           gdbarch_tdep (gdbarch)->wb_regnum,
  75                           &regs->windowbase);
  76   if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
  77     regcache_raw_collect (regcache,
  78                           gdbarch_tdep (gdbarch)->ws_regnum,
  79                           &regs->windowstart);
  80   if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
  81     regcache_raw_collect (regcache,
  82                           gdbarch_tdep (gdbarch)->lbeg_regnum,
  83                           &regs->lbeg);
  84   if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
  85     regcache_raw_collect (regcache,
  86                           gdbarch_tdep (gdbarch)->lend_regnum,
  87                           &regs->lend);
  88   if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
  89     regcache_raw_collect (regcache,
  90                           gdbarch_tdep (gdbarch)->lcount_regnum,
  91                           &regs->lcount);
  92   if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
  93     regcache_raw_collect (regcache,
  94                           gdbarch_tdep (gdbarch)->sar_regnum,
  95                           &regs->sar);
  96   if (regnum >=gdbarch_tdep (gdbarch)->ar_base
  97       && regnum < gdbarch_tdep (gdbarch)->ar_base
  98                     + gdbarch_tdep (gdbarch)->num_aregs)
  99     regcache_raw_collect (regcache,regnum,
 100                           &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
 101   else if (regnum == -1)
 102     {
 103       for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
 104         regcache_raw_collect (regcache,
 105                               gdbarch_tdep (gdbarch)->ar_base + i,
 106                               &regs->ar[i]);
 107     }
 108 }
 109
 110 void
 111 supply_gregset_reg (struct regcache *regcache,
 112                     const gdb_gregset_t *gregsetp, int regnum)
 113 {
 114   int i;
 115   xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
 116
 117   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 118
 119   if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
 120     regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
 121   if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
 122     regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
 123
 124   if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
 125     regcache_raw_supply (regcache,
 126                           gdbarch_tdep (gdbarch)->wb_regnum,
 127                           &regs->windowbase);
 128   if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
 129     regcache_raw_supply (regcache,
 130                           gdbarch_tdep (gdbarch)->ws_regnum,
 131                           &regs->windowstart);
 132   if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
 133     regcache_raw_supply (regcache,
 134                           gdbarch_tdep (gdbarch)->lbeg_regnum,
 135                           &regs->lbeg);
 136   if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
 137     regcache_raw_supply (regcache,
 138                           gdbarch_tdep (gdbarch)->lend_regnum,
 139                           &regs->lend);
 140   if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
 141     regcache_raw_supply (regcache,
 142                           gdbarch_tdep (gdbarch)->lcount_regnum,
 143                           &regs->lcount);
 144   if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
 145     regcache_raw_supply (regcache,
 146                           gdbarch_tdep (gdbarch)->sar_regnum,
 147                           &regs->sar);
 148   if (regnum >=gdbarch_tdep (gdbarch)->ar_base
 149       && regnum < gdbarch_tdep (gdbarch)->ar_base
 150                     + gdbarch_tdep (gdbarch)->num_aregs)
 151     regcache_raw_supply (regcache,regnum,
 152                           &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
 153   else if (regnum == -1)
 154     {
 155       for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
 156         regcache_raw_supply (regcache,
 157                               gdbarch_tdep (gdbarch)->ar_base + i,
 158                               &regs->ar[i]);
 159     }
 160 }
 161
 162 void
 163 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
 164 {
 165   supply_gregset_reg (regcache, gregsetp, -1);
 166 }
 167
 168 void
 169 fill_fpregset (const struct regcache *regcache,
 170                gdb_fpregset_t *fpregsetp, int regnum)
 171 {
 172   return;
 173 }
 174
 175 void
 176 supply_fpregset (struct regcache *regcache,
 177                  const gdb_fpregset_t *fpregsetp)
 178 {
 179   return;
 180 }
 181
 182 /* Fetch greg-register(s) from process/thread TID
 183    and store value(s) in GDB's register array.  */
 184
 185 static void
 186 fetch_gregs (struct regcache *regcache, int regnum)
 187 {
 188   int tid = GET_THREAD_ID (inferior_ptid);
 189   const gdb_gregset_t regs;
 190   int areg;
 191
 192   if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 193     {
 194       perror_with_name (_("Couldn't get registers"));
 195       return;
 196     }
 197
 198   supply_gregset_reg (regcache, &regs, regnum);
 199 }
 200
 201 /* Store greg-register(s) in GDB's register
 202    array into the process/thread specified by TID.  */
 203
 204 static void
 205 store_gregs (struct regcache *regcache, int regnum)
 206 {
 207   int tid = GET_THREAD_ID (inferior_ptid);
 208   gdb_gregset_t regs;
 209   int areg;
 210
 211   if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 212     {
 213       perror_with_name (_("Couldn't get registers"));
 214       return;
 215     }
 216
 217   fill_gregset (regcache, &regs, regnum);
 218
 219   if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
 220     {
 221       perror_with_name (_("Couldn't write registers"));
 222       return;
 223     }
 224 }
 225
 226 static int xtreg_lo;
 227 static int xtreg_high;
 228
 229 /* Fetch/Store Xtensa TIE registers.  Xtensa GNU/Linux PTRACE
 230    interface provides special requests for this.  */
 231
 232 static void
 233 fetch_xtregs (struct regcache *regcache, int regnum)
 234 {
 235   int tid = GET_THREAD_ID (inferior_ptid);
 236   const xtensa_regtable_t *ptr;
 237   char xtregs [XTENSA_ELF_XTREG_SIZE];
 238
 239   if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
 240     perror_with_name (_("Couldn't get extended registers"));
 241
 242   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 243     if (regnum == ptr->gdb_regnum || regnum == -1)
 244       regcache_raw_supply (regcache, ptr->gdb_regnum,
 245                            xtregs + ptr->ptrace_offset);
 246 }
 247
 248 static void
 249 store_xtregs (struct regcache *regcache, int regnum)
 250 {
 251   int tid = GET_THREAD_ID (inferior_ptid);
 252   const xtensa_regtable_t *ptr;
 253   char xtregs [XTENSA_ELF_XTREG_SIZE];
 254
 255   if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
 256     perror_with_name (_("Couldn't get extended registers"));
 257
 258   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 259     if (regnum == ptr->gdb_regnum || regnum == -1)
 260       regcache_raw_collect (regcache, ptr->gdb_regnum,
 261                             xtregs + ptr->ptrace_offset);
 262
 263   if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
 264     perror_with_name (_("Couldn't write extended registers"));
 265 }
 266
 267 void
 268 xtensa_linux_fetch_inferior_registers (struct target_ops *ops,
 269                                        struct regcache *regcache, int regnum)
 270 {
 271   if (regnum == -1)
 272     {
 273       fetch_gregs (regcache, regnum);
 274       fetch_xtregs (regcache, regnum);
 275     }
 276   else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
 277     fetch_gregs (regcache, regnum);
 278   else
 279     fetch_xtregs (regcache, regnum);
 280 }
 281
 282 void
 283 xtensa_linux_store_inferior_registers (struct target_ops *ops,
 284                                        struct regcache *regcache, int regnum)
 285 {
 286   if (regnum == -1)
 287     {
 288       store_gregs (regcache, regnum);
 289       store_xtregs (regcache, regnum);
 290     }
 291   else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
 292     store_gregs (regcache, regnum);
 293   else
 294     store_xtregs (regcache, regnum);
 295 }
 296
 297 void _initialize_xtensa_linux_nat (void);
 298
 299 void
 300 _initialize_xtensa_linux_nat (void)
 301 {
 302   struct target_ops *t;
 303   const xtensa_regtable_t *ptr;
 304
 305   /* Calculate the number range for extended registers.  */
 306   xtreg_lo = 1000000000;
 307   xtreg_high = -1;
 308   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 309     {
 310       if (ptr->gdb_regnum < xtreg_lo)
 311         xtreg_lo = ptr->gdb_regnum;
 312       if (ptr->gdb_regnum > xtreg_high)
 313         xtreg_high = ptr->gdb_regnum;
 314     }
 315
 316   /* Fill in the generic GNU/Linux methods.  */
 317   t = linux_target ();
 318
 319   /* Add our register access methods.  */
 320   t->to_fetch_registers = xtensa_linux_fetch_inferior_registers;
 321   t->to_store_registers = xtensa_linux_store_inferior_registers;
 322
 323   linux_nat_add_target (t);
 324 }