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 "gdb_assert.h"
  26 #include <sys/ptrace.h>
  27 #include <sys/utsname.h>
  28 #include <machine/save_state.h>
  29
  30 #ifdef HAVE_TTRACE
  31 #include <sys/ttrace.h>
  32 #endif
  33
  34 #include "hppa-tdep.h"
  35 #include "solib-som.h"
  36 #include "inf-ptrace.h"
  37 #include "inf-ttrace.h"
  38
  39 /* Return the offset of register REGNUM within `struct save_state'.
  40    The offset returns depends on the flags in the "flags" register and
  41    the register size (32-bit or 64-bit).  These are taken from
  42    REGCACHE.  */
  43
  44 static LONGEST
  45 hppa_hpux_save_state_offset (struct regcache *regcache, int regnum)
  46 {
  47   LONGEST offset;
  48
  49   if (regnum == HPPA_FLAGS_REGNUM)
  50     return ssoff (ss_flags);
  51
  52   if (HPPA_R0_REGNUM < regnum && regnum < HPPA_FP0_REGNUM)
  53     {
  54       struct gdbarch *arch = get_regcache_arch (regcache);
  55       size_t size = register_size (arch, HPPA_R1_REGNUM);
  56       ULONGEST flags;
  57
  58       gdb_assert (size == 4 || size == 8);
  59
  60       regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
  61       if (flags & SS_WIDEREGS)
  62         offset = ssoff (ss_wide) + (8 - size) + (regnum - HPPA_R0_REGNUM) * 8;
  63       else
  64         offset = ssoff (ss_narrow) + (regnum - HPPA_R1_REGNUM) * 4;
  65     }
  66   else
  67     {
  68       struct gdbarch *arch = get_regcache_arch (regcache);
  69       size_t size = register_size (arch, HPPA_FP0_REGNUM);
  70
  71       gdb_assert (size == 4 || size == 8);
  72       gdb_assert (regnum >= HPPA_FP0_REGNUM);
  73       offset = ssoff(ss_fpblock) + (regnum - HPPA_FP0_REGNUM) * size;
  74     }
  75
  76   gdb_assert (offset < sizeof (save_state_t));
  77   return offset;
  78 }
  79
  80 /* Just in case a future version of PA-RISC HP-UX won't have ptrace(2)
  81    at all.  */
  82 #ifndef PTRACE_TYPE_RET
  83 #define PTRACE_TYPE_RET void
  84 #endif
  85
  86 static void
  87 hppa_hpux_fetch_register (struct regcache *regcache, int regnum)
  88 {
  89   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  90   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  91   CORE_ADDR addr;
  92   size_t size;
  93   PTRACE_TYPE_RET *buf;
  94   pid_t pid;
  95   int i;
  96
  97   pid = ptid_get_pid (inferior_ptid);
  98
  99   /* This isn't really an address, but ptrace thinks of it as one.  */
 100   addr = hppa_hpux_save_state_offset (regcache, regnum);
 101   size = register_size (gdbarch, regnum);
 102
 103   gdb_assert (size == 4 || size == 8);
 104   buf = alloca (size);
 105
 106 #ifdef HAVE_TTRACE
 107   {
 108     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 109
 110     if (ttrace (TT_LWP_RUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 111       error (_("Couldn't read register %s (#%d): %s"),
 112              gdbarch_register_name (gdbarch, regnum),
 113              regnum, safe_strerror (errno));
 114   }
 115 #else
 116   {
 117     int i;
 118
 119     /* Read the register contents from the inferior a chuck at the time.  */
 120     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 121       {
 122         errno = 0;
 123         buf[i] = ptrace (PT_RUREGS, pid, (PTRACE_TYPE_ARG3) addr, 0, 0);
 124         if (errno != 0)
 125           error (_("Couldn't read register %s (#%d): %s"),
 126                  gdbarch_register_name (gdbarch, regnum),
 127                  regnum, safe_strerror (errno));
 128
 129         addr += sizeof (PTRACE_TYPE_RET);
 130       }
 131   }
 132 #endif
 133
 134   /* Take care with the "flags" register.  It's stored as an `int' in
 135      `struct save_state', even for 64-bit code.  */
 136   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 137     {
 138       ULONGEST flags;
 139       flags = extract_unsigned_integer ((gdb_byte *)buf, 4, byte_order);
 140       store_unsigned_integer ((gdb_byte *)buf, 8, byte_order, flags);
 141     }
 142
 143   regcache_raw_supply (regcache, regnum, buf);
 144 }
 145
 146 static void
 147 hppa_hpux_fetch_inferior_registers (struct target_ops *ops,
 148                                     struct regcache *regcache, int regnum)
 149 {
 150   if (regnum == -1)
 151     for (regnum = 0;
 152          regnum < gdbarch_num_regs (get_regcache_arch (regcache));
 153          regnum++)
 154       hppa_hpux_fetch_register (regcache, regnum);
 155   else
 156     hppa_hpux_fetch_register (regcache, regnum);
 157 }
 158
 159 /* Store register REGNUM into the inferior.  */
 160
 161 static void
 162 hppa_hpux_store_register (struct regcache *regcache, int regnum)
 163 {
 164   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 165   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 166   CORE_ADDR addr;
 167   size_t size;
 168   PTRACE_TYPE_RET *buf;
 169   pid_t pid;
 170
 171   pid = ptid_get_pid (inferior_ptid);
 172
 173   /* This isn't really an address, but ptrace thinks of it as one.  */
 174   addr = hppa_hpux_save_state_offset (regcache, regnum);
 175   size = register_size (gdbarch, regnum);
 176
 177   gdb_assert (size == 4 || size == 8);
 178   buf = alloca (size);
 179
 180   regcache_raw_collect (regcache, regnum, buf);
 181
 182   /* Take care with the "flags" register.  It's stored as an `int' in
 183      `struct save_state', even for 64-bit code.  */
 184   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 185     {
 186       ULONGEST flags;
 187       flags = extract_unsigned_integer ((gdb_byte *)buf, 8, byte_order);
 188       store_unsigned_integer ((gdb_byte *)buf, 4, byte_order, flags);
 189       size = 4;
 190     }
 191
 192 #ifdef HAVE_TTRACE
 193   {
 194     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 195
 196     if (ttrace (TT_LWP_WUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 197       error (_("Couldn't write register %s (#%d): %s"),
 198              gdbarch_register_name (gdbarch, regnum),
 199              regnum, safe_strerror (errno));
 200   }
 201 #else
 202   {
 203     int i;
 204
 205     /* Write the register contents into the inferior a chunk at the time.  */
 206     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 207       {
 208         errno = 0;
 209         ptrace (PT_WUREGS, pid, (PTRACE_TYPE_ARG3) addr, buf[i], 0);
 210         if (errno != 0)
 211           error (_("Couldn't write register %s (#%d): %s"),
 212                  gdbarch_register_name (gdbarch, regnum),
 213                  regnum, safe_strerror (errno));
 214
 215         addr += sizeof (PTRACE_TYPE_RET);
 216       }
 217   }
 218 #endif
 219 }
 220
 221 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 222    this for all registers (including the floating point registers).  */
 223
 224 static void
 225 hppa_hpux_store_inferior_registers (struct target_ops *ops,
 226                                     struct regcache *regcache, int regnum)
 227 {
 228   if (regnum == -1)
 229     for (regnum = 0;
 230          regnum < gdbarch_num_regs (get_regcache_arch (regcache));
 231          regnum++)
 232       hppa_hpux_store_register (regcache, regnum);
 233   else
 234     hppa_hpux_store_register (regcache, regnum);
 235 }
 236
 237 /* Set hpux_major_release variable to the value retrieved from a call to
 238    uname function.  */
 239
 240 static void
 241 set_hpux_major_release (void)
 242 {
 243   struct utsname x;
 244   char *p;
 245
 246   uname (&x);
 247   p = strchr (x.release, '.');
 248   if (p)
 249     hpux_major_release = atoi (p + 1);
 250 }
 251
 252 \f
 253
 254 /* Prevent warning from -Wmissing-prototypes.  */
 255 void _initialize_hppa_hpux_nat (void);
 256
 257 void
 258 _initialize_hppa_hpux_nat (void)
 259 {
 260   struct target_ops *t;
 261
 262   set_hpux_major_release ();
 263
 264 #ifdef HAVE_TTRACE
 265   t = inf_ttrace_target ();
 266 #else
 267   t = inf_ptrace_target ();
 268 #endif
 269
 270   t->to_fetch_registers = hppa_hpux_fetch_inferior_registers;
 271   t->to_store_registers = hppa_hpux_store_inferior_registers;
 272
 273   add_target (t);
 274 }