gdb/hppa-hpux-nat.c

   1 /* Native-dependent code for PA-RISC HP-UX.
   2
   3    Copyright (C) 2004, 2005, 2007, 2008, 2009 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 <machine/save_state.h>
  28
  29 #ifdef HAVE_TTRACE
  30 #include <sys/ttrace.h>
  31 #endif
  32
  33 #include "hppa-tdep.h"
  34 #include "inf-ptrace.h"
  35 #include "inf-ttrace.h"
  36
  37 /* Non-zero if we should pretend not to be a runnable target.  */
  38 int child_suppress_run = 0;
  39
  40 /* Return the offset of register REGNUM within `struct save_state'.
  41    The offset returns depends on the flags in the "flags" register and
  42    the register size (32-bit or 64-bit).  These are taken from
  43    REGCACHE.  */
  44
  45 LONGEST
  46 hppa_hpux_save_state_offset (struct regcache *regcache, int regnum)
  47 {
  48   LONGEST offset;
  49
  50   if (regnum == HPPA_FLAGS_REGNUM)
  51     return ssoff (ss_flags);
  52
  53   if (HPPA_R0_REGNUM < regnum && regnum < HPPA_FP0_REGNUM)
  54     {
  55       struct gdbarch *arch = get_regcache_arch (regcache);
  56       size_t size = register_size (arch, HPPA_R1_REGNUM);
  57       ULONGEST flags;
  58
  59       gdb_assert (size == 4 || size == 8);
  60
  61       regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
  62       if (flags & SS_WIDEREGS)
  63         offset = ssoff (ss_wide) + (8 - size) + (regnum - HPPA_R0_REGNUM) * 8;
  64       else
  65         offset = ssoff (ss_narrow) + (regnum - HPPA_R1_REGNUM) * 4;
  66     }
  67   else
  68     {
  69       struct gdbarch *arch = get_regcache_arch (regcache);
  70       size_t size = register_size (arch, HPPA_FP0_REGNUM);
  71
  72       gdb_assert (size == 4 || size == 8);
  73       gdb_assert (regnum >= HPPA_FP0_REGNUM);
  74       offset = ssoff(ss_fpblock) + (regnum - HPPA_FP0_REGNUM) * size;
  75     }
  76
  77   gdb_assert (offset < sizeof (save_state_t));
  78   return offset;
  79 }
  80
  81 /* Just in case a future version of PA-RISC HP-UX won't have ptrace(2)
  82    at all.  */
  83 #ifndef PTRACE_TYPE_RET
  84 #define PTRACE_TYPE_RET void
  85 #endif
  86
  87 static void
  88 hppa_hpux_fetch_register (struct regcache *regcache, int regnum)
  89 {
  90   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  91   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  92   CORE_ADDR addr;
  93   size_t size;
  94   PTRACE_TYPE_RET *buf;
  95   pid_t pid;
  96   int i;
  97
  98   pid = ptid_get_pid (inferior_ptid);
  99
 100   /* This isn't really an address, but ptrace thinks of it as one.  */
 101   addr = hppa_hpux_save_state_offset (regcache, regnum);
 102   size = register_size (gdbarch, regnum);
 103
 104   gdb_assert (size == 4 || size == 8);
 105   buf = alloca (size);
 106
 107 #ifdef HAVE_TTRACE
 108   {
 109     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 110
 111     if (ttrace (TT_LWP_RUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 112       error (_("Couldn't read register %s (#%d): %s"),
 113              gdbarch_register_name (gdbarch, regnum),
 114              regnum, safe_strerror (errno));
 115   }
 116 #else
 117   {
 118     int i;
 119
 120     /* Read the register contents from the inferior a chuck at the time.  */
 121     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 122       {
 123         errno = 0;
 124         buf[i] = ptrace (PT_RUREGS, pid, (PTRACE_TYPE_ARG3) addr, 0, 0);
 125         if (errno != 0)
 126           error (_("Couldn't read register %s (#%d): %s"),
 127                  gdbarch_register_name (gdbarch, regnum),
 128                  regnum, safe_strerror (errno));
 129
 130         addr += sizeof (PTRACE_TYPE_RET);
 131       }
 132   }
 133 #endif
 134
 135   /* Take care with the "flags" register.  It's stored as an `int' in
 136      `struct save_state', even for 64-bit code.  */
 137   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 138     {
 139       ULONGEST flags;
 140       flags = extract_unsigned_integer ((gdb_byte *)buf, 4, byte_order);
 141       store_unsigned_integer ((gdb_byte *)buf, 8, byte_order, flags);
 142     }
 143
 144   regcache_raw_supply (regcache, regnum, buf);
 145 }
 146
 147 static void
 148 hppa_hpux_fetch_inferior_registers (struct target_ops *ops,
 149                                     struct regcache *regcache, int regnum)
 150 {
 151   if (regnum == -1)
 152     for (regnum = 0;
 153          regnum < gdbarch_num_regs (get_regcache_arch (regcache));
 154          regnum++)
 155       hppa_hpux_fetch_register (regcache, regnum);
 156   else
 157     hppa_hpux_fetch_register (regcache, regnum);
 158 }
 159
 160 /* Store register REGNUM into the inferior.  */
 161
 162 static void
 163 hppa_hpux_store_register (struct regcache *regcache, int regnum)
 164 {
 165   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 166   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 167   CORE_ADDR addr;
 168   size_t size;
 169   PTRACE_TYPE_RET *buf;
 170   pid_t pid;
 171
 172   pid = ptid_get_pid (inferior_ptid);
 173
 174   /* This isn't really an address, but ptrace thinks of it as one.  */
 175   addr = hppa_hpux_save_state_offset (regcache, regnum);
 176   size = register_size (gdbarch, regnum);
 177
 178   gdb_assert (size == 4 || size == 8);
 179   buf = alloca (size);
 180
 181   regcache_raw_collect (regcache, regnum, buf);
 182
 183   /* Take care with the "flags" register.  It's stored as an `int' in
 184      `struct save_state', even for 64-bit code.  */
 185   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 186     {
 187       ULONGEST flags;
 188       flags = extract_unsigned_integer ((gdb_byte *)buf, 8, byte_order);
 189       store_unsigned_integer ((gdb_byte *)buf, 4, byte_order, flags);
 190       size = 4;
 191     }
 192
 193 #ifdef HAVE_TTRACE
 194   {
 195     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 196
 197     if (ttrace (TT_LWP_WUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 198       error (_("Couldn't write register %s (#%d): %s"),
 199              gdbarch_register_name (gdbarch, regnum),
 200              regnum, safe_strerror (errno));
 201   }
 202 #else
 203   {
 204     int i;
 205
 206     /* Write the register contents into the inferior a chunk at the time.  */
 207     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 208       {
 209         errno = 0;
 210         ptrace (PT_WUREGS, pid, (PTRACE_TYPE_ARG3) addr, buf[i], 0);
 211         if (errno != 0)
 212           error (_("Couldn't write register %s (#%d): %s"),
 213                  gdbarch_register_name (gdbarch, regnum),
 214                  regnum, safe_strerror (errno));
 215
 216         addr += sizeof (PTRACE_TYPE_RET);
 217       }
 218   }
 219 #endif
 220 }
 221
 222 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 223    this for all registers (including the floating point registers).  */
 224
 225 static void
 226 hppa_hpux_store_inferior_registers (struct target_ops *ops,
 227                                     struct regcache *regcache, int regnum)
 228 {
 229   if (regnum == -1)
 230     for (regnum = 0;
 231          regnum < gdbarch_num_regs (get_regcache_arch (regcache));
 232          regnum++)
 233       hppa_hpux_store_register (regcache, regnum);
 234   else
 235     hppa_hpux_store_register (regcache, regnum);
 236 }
 237
 238 static int
 239 hppa_hpux_child_can_run (void)
 240 {
 241   /* This variable is controlled by modules that layer their own
 242      process structure atop that provided here.  The code in
 243      hpux-thread.c does this to support the HP-UX user-mode DCE
 244      threads.  */
 245   return !child_suppress_run;
 246 }
 247 \f
 248
 249 /* Prevent warning from -Wmissing-prototypes.  */
 250 void _initialize_hppa_hpux_nat (void);
 251
 252 void
 253 _initialize_hppa_hpux_nat (void)
 254 {
 255   struct target_ops *t;
 256
 257 #ifdef HAVE_TTRACE
 258   t = inf_ttrace_target ();
 259 #else
 260   t = inf_ptrace_target ();
 261 #endif
 262
 263   t->to_fetch_registers = hppa_hpux_fetch_inferior_registers;
 264   t->to_store_registers = hppa_hpux_store_inferior_registers;
 265   t->to_can_run = hppa_hpux_child_can_run;
 266
 267   add_target (t);
 268 }