gdb/hppa-hpux-nat.c

   1 /* Native-dependent code for PA-RISC HP-UX.
   2
   3    Copyright (C) 2004-2014 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 "inferior.h"
  22 #include "regcache.h"
  23 #include "target.h"
  24
  25 #include <sys/ptrace.h>
  26 #include <sys/utsname.h>
  27 #include <machine/save_state.h>
  28
  29 #ifdef HAVE_TTRACE
  30 #include <sys/ttrace.h>
  31 #endif
  32
  33 #include "hppa-tdep.h"
  34 #include "solib-som.h"
  35 #include "inf-ptrace.h"
  36 #include "inf-ttrace.h"
  37
  38 /* Return the offset of register REGNUM within `struct save_state'.
  39    The offset returns depends on the flags in the "flags" register and
  40    the register size (32-bit or 64-bit).  These are taken from
  41    REGCACHE.  */
  42
  43 static LONGEST
  44 hppa_hpux_save_state_offset (struct regcache *regcache, int regnum)
  45 {
  46   LONGEST offset;
  47
  48   if (regnum == HPPA_FLAGS_REGNUM)
  49     return ssoff (ss_flags);
  50
  51   if (HPPA_R0_REGNUM < regnum && regnum < HPPA_FP0_REGNUM)
  52     {
  53       struct gdbarch *arch = get_regcache_arch (regcache);
  54       size_t size = register_size (arch, HPPA_R1_REGNUM);
  55       ULONGEST flags;
  56
  57       gdb_assert (size == 4 || size == 8);
  58
  59       regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
  60       if (flags & SS_WIDEREGS)
  61         offset = ssoff (ss_wide) + (8 - size) + (regnum - HPPA_R0_REGNUM) * 8;
  62       else
  63         offset = ssoff (ss_narrow) + (regnum - HPPA_R1_REGNUM) * 4;
  64     }
  65   else
  66     {
  67       struct gdbarch *arch = get_regcache_arch (regcache);
  68       size_t size = register_size (arch, HPPA_FP0_REGNUM);
  69
  70       gdb_assert (size == 4 || size == 8);
  71       gdb_assert (regnum >= HPPA_FP0_REGNUM);
  72       offset = ssoff(ss_fpblock) + (regnum - HPPA_FP0_REGNUM) * size;
  73     }
  74
  75   gdb_assert (offset < sizeof (save_state_t));
  76   return offset;
  77 }
  78
  79 /* Just in case a future version of PA-RISC HP-UX won't have ptrace(2)
  80    at all.  */
  81 #ifndef PTRACE_TYPE_RET
  82 #define PTRACE_TYPE_RET void
  83 #endif
  84
  85 static void
  86 hppa_hpux_fetch_register (struct regcache *regcache, int regnum)
  87 {
  88   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  89   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  90   CORE_ADDR addr;
  91   size_t size;
  92   PTRACE_TYPE_RET *buf;
  93   pid_t pid;
  94   int i;
  95
  96   pid = ptid_get_pid (inferior_ptid);
  97
  98   /* This isn't really an address, but ptrace thinks of it as one.  */
  99   addr = hppa_hpux_save_state_offset (regcache, regnum);
 100   size = register_size (gdbarch, regnum);
 101
 102   gdb_assert (size == 4 || size == 8);
 103   buf = alloca (size);
 104
 105 #ifdef HAVE_TTRACE
 106   {
 107     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 108
 109     if (ttrace (TT_LWP_RUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 110       error (_("Couldn't read register %s (#%d): %s"),
 111              gdbarch_register_name (gdbarch, regnum),
 112              regnum, safe_strerror (errno));
 113   }
 114 #else
 115   {
 116     int i;
 117
 118     /* Read the register contents from the inferior a chuck at the time.  */
 119     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 120       {
 121         errno = 0;
 122         buf[i] = ptrace (PT_RUREGS, pid, (PTRACE_TYPE_ARG3) addr, 0, 0);
 123         if (errno != 0)
 124           error (_("Couldn't read register %s (#%d): %s"),
 125                  gdbarch_register_name (gdbarch, regnum),
 126                  regnum, safe_strerror (errno));
 127
 128         addr += sizeof (PTRACE_TYPE_RET);
 129       }
 130   }
 131 #endif
 132
 133   /* Take care with the "flags" register.  It's stored as an `int' in
 134      `struct save_state', even for 64-bit code.  */
 135   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 136     {
 137       ULONGEST flags;
 138       flags = extract_unsigned_integer ((gdb_byte *)buf, 4, byte_order);
 139       store_unsigned_integer ((gdb_byte *)buf, 8, byte_order, flags);
 140     }
 141
 142   regcache_raw_supply (regcache, regnum, buf);
 143 }
 144
 145 static void
 146 hppa_hpux_fetch_inferior_registers (struct target_ops *ops,
 147                                     struct regcache *regcache, int regnum)
 148 {
 149   if (regnum == -1)
 150     for (regnum = 0;
 151          regnum < gdbarch_num_regs (get_regcache_arch (regcache));
 152          regnum++)
 153       hppa_hpux_fetch_register (regcache, regnum);
 154   else
 155     hppa_hpux_fetch_register (regcache, regnum);
 156 }
 157
 158 /* Store register REGNUM into the inferior.  */
 159
 160 static void
 161 hppa_hpux_store_register (struct regcache *regcache, int regnum)
 162 {
 163   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 164   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 165   CORE_ADDR addr;
 166   size_t size;
 167   PTRACE_TYPE_RET *buf;
 168   pid_t pid;
 169
 170   pid = ptid_get_pid (inferior_ptid);
 171
 172   /* This isn't really an address, but ptrace thinks of it as one.  */
 173   addr = hppa_hpux_save_state_offset (regcache, regnum);
 174   size = register_size (gdbarch, regnum);
 175
 176   gdb_assert (size == 4 || size == 8);
 177   buf = alloca (size);
 178
 179   regcache_raw_collect (regcache, regnum, buf);
 180
 181   /* Take care with the "flags" register.  It's stored as an `int' in
 182      `struct save_state', even for 64-bit code.  */
 183   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 184     {
 185       ULONGEST flags;
 186       flags = extract_unsigned_integer ((gdb_byte *)buf, 8, byte_order);
 187       store_unsigned_integer ((gdb_byte *)buf, 4, byte_order, flags);
 188       size = 4;
 189     }
 190
 191 #ifdef HAVE_TTRACE
 192   {
 193     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 194
 195     if (ttrace (TT_LWP_WUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 196       error (_("Couldn't write register %s (#%d): %s"),
 197              gdbarch_register_name (gdbarch, regnum),
 198              regnum, safe_strerror (errno));
 199   }
 200 #else
 201   {
 202     int i;
 203
 204     /* Write the register contents into the inferior a chunk at the time.  */
 205     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 206       {
 207         errno = 0;
 208         ptrace (PT_WUREGS, pid, (PTRACE_TYPE_ARG3) addr, buf[i], 0);
 209         if (errno != 0)
 210           error (_("Couldn't write register %s (#%d): %s"),
 211                  gdbarch_register_name (gdbarch, regnum),
 212                  regnum, safe_strerror (errno));
 213
 214         addr += sizeof (PTRACE_TYPE_RET);
 215       }
 216   }
 217 #endif
 218 }
 219
 220 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 221    this for all registers (including the floating point registers).  */
 222
 223 static void
 224 hppa_hpux_store_inferior_registers (struct target_ops *ops,
 225                                     struct regcache *regcache, int regnum)
 226 {
 227   if (regnum == -1)
 228     for (regnum = 0;
 229          regnum < gdbarch_num_regs (get_regcache_arch (regcache));
 230          regnum++)
 231       hppa_hpux_store_register (regcache, regnum);
 232   else
 233     hppa_hpux_store_register (regcache, regnum);
 234 }
 235
 236 /* Set hpux_major_release variable to the value retrieved from a call to
 237    uname function.  */
 238
 239 static void
 240 set_hpux_major_release (void)
 241 {
 242   struct utsname x;
 243   char *p;
 244
 245   uname (&x);
 246   p = strchr (x.release, '.');
 247   if (p)
 248     hpux_major_release = atoi (p + 1);
 249 }
 250
 251 \f
 252
 253 /* Prevent warning from -Wmissing-prototypes.  */
 254 void _initialize_hppa_hpux_nat (void);
 255
 256 void
 257 _initialize_hppa_hpux_nat (void)
 258 {
 259   struct target_ops *t;
 260
 261   set_hpux_major_release ();
 262
 263 #ifdef HAVE_TTRACE
 264   t = inf_ttrace_target ();
 265 #else
 266   t = inf_ptrace_target ();
 267 #endif
 268
 269   t->to_fetch_registers = hppa_hpux_fetch_inferior_registers;
 270   t->to_store_registers = hppa_hpux_store_inferior_registers;
 271
 272   add_target (t);
 273 }