gdb/xtensa-linux-nat.c

   1 /* Xtensa GNU/Linux native support.
   2
   3    Copyright (C) 2007-2013 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 <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 <signal.h>
  33 #include <sys/user.h>
  34 #include <sys/ioctl.h>
  35 #include "gdb_wait.h"
  36 #include <fcntl.h>
  37 #include <sys/procfs.h>
  38 #include <sys/ptrace.h>
  39
  40 #include "gregset.h"
  41 #include "xtensa-tdep.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 static int
  49 get_thread_id (ptid_t ptid)
  50 {
  51   int tid = ptid_get_lwp (ptid);
  52   if (0 == tid)
  53     tid = ptid_get_pid (ptid);
  54   return tid;
  55 }
  56 #define GET_THREAD_ID(PTID)     get_thread_id (PTID)
  57
  58 void
  59 fill_gregset (const struct regcache *regcache,
  60               gdb_gregset_t *gregsetp, int regnum)
  61 {
  62   int i;
  63   xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
  64   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  65
  66   if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
  67     regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
  68   if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
  69     regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
  70
  71   if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
  72     regcache_raw_collect (regcache,
  73                           gdbarch_tdep (gdbarch)->wb_regnum,
  74                           &regs->windowbase);
  75   if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
  76     regcache_raw_collect (regcache,
  77                           gdbarch_tdep (gdbarch)->ws_regnum,
  78                           &regs->windowstart);
  79   if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
  80     regcache_raw_collect (regcache,
  81                           gdbarch_tdep (gdbarch)->lbeg_regnum,
  82                           &regs->lbeg);
  83   if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
  84     regcache_raw_collect (regcache,
  85                           gdbarch_tdep (gdbarch)->lend_regnum,
  86                           &regs->lend);
  87   if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
  88     regcache_raw_collect (regcache,
  89                           gdbarch_tdep (gdbarch)->lcount_regnum,
  90                           &regs->lcount);
  91   if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
  92     regcache_raw_collect (regcache,
  93                           gdbarch_tdep (gdbarch)->sar_regnum,
  94                           &regs->sar);
  95   if (regnum >=gdbarch_tdep (gdbarch)->ar_base
  96       && regnum < gdbarch_tdep (gdbarch)->ar_base
  97                     + gdbarch_tdep (gdbarch)->num_aregs)
  98     regcache_raw_collect (regcache,regnum,
  99                           &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
 100   else if (regnum == -1)
 101     {
 102       for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
 103         regcache_raw_collect (regcache,
 104                               gdbarch_tdep (gdbarch)->ar_base + i,
 105                               &regs->ar[i]);
 106     }
 107 }
 108
 109 void
 110 supply_gregset_reg (struct regcache *regcache,
 111                     const gdb_gregset_t *gregsetp, int regnum)
 112 {
 113   int i;
 114   xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
 115
 116   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 117
 118   if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
 119     regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);
 120   if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
 121     regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);
 122
 123   if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
 124     regcache_raw_supply (regcache,
 125                           gdbarch_tdep (gdbarch)->wb_regnum,
 126                           &regs->windowbase);
 127   if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
 128     regcache_raw_supply (regcache,
 129                           gdbarch_tdep (gdbarch)->ws_regnum,
 130                           &regs->windowstart);
 131   if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
 132     regcache_raw_supply (regcache,
 133                           gdbarch_tdep (gdbarch)->lbeg_regnum,
 134                           &regs->lbeg);
 135   if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
 136     regcache_raw_supply (regcache,
 137                           gdbarch_tdep (gdbarch)->lend_regnum,
 138                           &regs->lend);
 139   if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
 140     regcache_raw_supply (regcache,
 141                           gdbarch_tdep (gdbarch)->lcount_regnum,
 142                           &regs->lcount);
 143   if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
 144     regcache_raw_supply (regcache,
 145                           gdbarch_tdep (gdbarch)->sar_regnum,
 146                           &regs->sar);
 147   if (regnum >=gdbarch_tdep (gdbarch)->ar_base
 148       && regnum < gdbarch_tdep (gdbarch)->ar_base
 149                     + gdbarch_tdep (gdbarch)->num_aregs)
 150     regcache_raw_supply (regcache,regnum,
 151                           &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
 152   else if (regnum == -1)
 153     {
 154       for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
 155         regcache_raw_supply (regcache,
 156                               gdbarch_tdep (gdbarch)->ar_base + i,
 157                               &regs->ar[i]);
 158     }
 159 }
 160
 161 void
 162 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
 163 {
 164   supply_gregset_reg (regcache, gregsetp, -1);
 165 }
 166
 167 void
 168 fill_fpregset (const struct regcache *regcache,
 169                gdb_fpregset_t *fpregsetp, int regnum)
 170 {
 171   return;
 172 }
 173
 174 void
 175 supply_fpregset (struct regcache *regcache,
 176                  const gdb_fpregset_t *fpregsetp)
 177 {
 178   return;
 179 }
 180
 181 /* Fetch greg-register(s) from process/thread TID
 182    and store value(s) in GDB's register array.  */
 183
 184 static void
 185 fetch_gregs (struct regcache *regcache, int regnum)
 186 {
 187   int tid = GET_THREAD_ID (inferior_ptid);
 188   const gdb_gregset_t regs;
 189   int areg;
 190
 191   if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 192     {
 193       perror_with_name (_("Couldn't get registers"));
 194       return;
 195     }
 196
 197   supply_gregset_reg (regcache, &regs, regnum);
 198 }
 199
 200 /* Store greg-register(s) in GDB's register
 201    array into the process/thread specified by TID.  */
 202
 203 static void
 204 store_gregs (struct regcache *regcache, int regnum)
 205 {
 206   int tid = GET_THREAD_ID (inferior_ptid);
 207   gdb_gregset_t regs;
 208   int areg;
 209
 210   if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 211     {
 212       perror_with_name (_("Couldn't get registers"));
 213       return;
 214     }
 215
 216   fill_gregset (regcache, &regs, regnum);
 217
 218   if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
 219     {
 220       perror_with_name (_("Couldn't write registers"));
 221       return;
 222     }
 223 }
 224
 225 static int xtreg_lo;
 226 static int xtreg_high;
 227
 228 /* Fetch/Store Xtensa TIE registers.  Xtensa GNU/Linux PTRACE
 229    interface provides special requests for this.  */
 230
 231 static void
 232 fetch_xtregs (struct regcache *regcache, int regnum)
 233 {
 234   int tid = GET_THREAD_ID (inferior_ptid);
 235   const xtensa_regtable_t *ptr;
 236   char xtregs [XTENSA_ELF_XTREG_SIZE];
 237
 238   if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
 239     perror_with_name (_("Couldn't get extended registers"));
 240
 241   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 242     if (regnum == ptr->gdb_regnum || regnum == -1)
 243       regcache_raw_supply (regcache, ptr->gdb_regnum,
 244                            xtregs + ptr->ptrace_offset);
 245 }
 246
 247 static void
 248 store_xtregs (struct regcache *regcache, int regnum)
 249 {
 250   int tid = GET_THREAD_ID (inferior_ptid);
 251   const xtensa_regtable_t *ptr;
 252   char xtregs [XTENSA_ELF_XTREG_SIZE];
 253
 254   if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
 255     perror_with_name (_("Couldn't get extended registers"));
 256
 257   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 258     if (regnum == ptr->gdb_regnum || regnum == -1)
 259       regcache_raw_collect (regcache, ptr->gdb_regnum,
 260                             xtregs + ptr->ptrace_offset);
 261
 262   if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
 263     perror_with_name (_("Couldn't write extended registers"));
 264 }
 265
 266 void
 267 xtensa_linux_fetch_inferior_registers (struct target_ops *ops,
 268                                        struct regcache *regcache, int regnum)
 269 {
 270   if (regnum == -1)
 271     {
 272       fetch_gregs (regcache, regnum);
 273       fetch_xtregs (regcache, regnum);
 274     }
 275   else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
 276     fetch_gregs (regcache, regnum);
 277   else
 278     fetch_xtregs (regcache, regnum);
 279 }
 280
 281 void
 282 xtensa_linux_store_inferior_registers (struct target_ops *ops,
 283                                        struct regcache *regcache, int regnum)
 284 {
 285   if (regnum == -1)
 286     {
 287       store_gregs (regcache, regnum);
 288       store_xtregs (regcache, regnum);
 289     }
 290   else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
 291     store_gregs (regcache, regnum);
 292   else
 293     store_xtregs (regcache, regnum);
 294 }
 295
 296 void _initialize_xtensa_linux_nat (void);
 297
 298 void
 299 _initialize_xtensa_linux_nat (void)
 300 {
 301   struct target_ops *t;
 302   const xtensa_regtable_t *ptr;
 303
 304   /* Calculate the number range for extended registers.  */
 305   xtreg_lo = 1000000000;
 306   xtreg_high = -1;
 307   for (ptr = xtensa_regmap_table; ptr->name; ptr++)
 308     {
 309       if (ptr->gdb_regnum < xtreg_lo)
 310         xtreg_lo = ptr->gdb_regnum;
 311       if (ptr->gdb_regnum > xtreg_high)
 312         xtreg_high = ptr->gdb_regnum;
 313     }
 314
 315   /* Fill in the generic GNU/Linux methods.  */
 316   t = linux_target ();
 317
 318   /* Add our register access methods.  */
 319   t->to_fetch_registers = xtensa_linux_fetch_inferior_registers;
 320   t->to_store_registers = xtensa_linux_store_inferior_registers;
 321
 322   linux_nat_add_target (t);
 323 }