gdb/hppa-hpux-nat.c

   1 /* Native-dependent code for PA-RISC HP-UX.
   2
   3    Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "inferior.h"
  23 #include "regcache.h"
  24 #include "target.h"
  25
  26 #include "gdb_assert.h"
  27 #include <sys/ptrace.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 "inf-ptrace.h"
  36 #include "inf-ttrace.h"
  37
  38 /* Non-zero if we should pretend not to be a runnable target.  */
  39 int child_suppress_run = 0;
  40
  41 /* Return the offset of register REGNUM within `struct save_state'.
  42    The offset returns depends on the flags in the "flags" register and
  43    the register size (32-bit or 64-bit).  These are taken from
  44    REGCACHE.  */
  45
  46 LONGEST
  47 hppa_hpux_save_state_offset (struct regcache *regcache, int regnum)
  48 {
  49   LONGEST offset;
  50
  51   if (regnum == HPPA_FLAGS_REGNUM)
  52     return ssoff (ss_flags);
  53
  54   if (HPPA_R0_REGNUM < regnum && regnum < HPPA_FP0_REGNUM)
  55     {
  56       struct gdbarch *arch = get_regcache_arch (regcache);
  57       size_t size = register_size (arch, HPPA_R1_REGNUM);
  58       ULONGEST flags;
  59
  60       gdb_assert (size == 4 || size == 8);
  61
  62       regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
  63       if (flags & SS_WIDEREGS)
  64         offset = ssoff (ss_wide) + (8 - size) + (regnum - HPPA_R0_REGNUM) * 8;
  65       else
  66         offset = ssoff (ss_narrow) + (regnum - HPPA_R1_REGNUM) * 4;
  67     }
  68   else
  69     {
  70       struct gdbarch *arch = get_regcache_arch (regcache);
  71       size_t size = register_size (arch, HPPA_FP0_REGNUM);
  72
  73       gdb_assert (size == 4 || size == 8);
  74       gdb_assert (regnum >= HPPA_FP0_REGNUM);
  75       offset = ssoff(ss_fpblock) + (regnum - HPPA_FP0_REGNUM) * size;
  76     }
  77
  78   gdb_assert (offset < sizeof (save_state_t));
  79   return offset;
  80 }
  81
  82 /* Just in case a future version of PA-RISC HP-UX won't have ptrace(2)
  83    at all.  */
  84 #ifndef PTRACE_TYPE_RET
  85 #define PTRACE_TYPE_RET void
  86 #endif
  87
  88 static void
  89 hppa_hpux_fetch_register (struct regcache *regcache, int regnum)
  90 {
  91   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  92   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  93   CORE_ADDR addr;
  94   size_t size;
  95   PTRACE_TYPE_RET *buf;
  96   pid_t pid;
  97   int i;
  98
  99   pid = ptid_get_pid (inferior_ptid);
 100
 101   /* This isn't really an address, but ptrace thinks of it as one.  */
 102   addr = hppa_hpux_save_state_offset (regcache, regnum);
 103   size = register_size (gdbarch, regnum);
 104
 105   gdb_assert (size == 4 || size == 8);
 106   buf = alloca (size);
 107
 108 #ifdef HAVE_TTRACE
 109   {
 110     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 111
 112     if (ttrace (TT_LWP_RUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 113       error (_("Couldn't read register %s (#%d): %s"),
 114              gdbarch_register_name (gdbarch, regnum),
 115              regnum, safe_strerror (errno));
 116   }
 117 #else
 118   {
 119     int i;
 120
 121     /* Read the register contents from the inferior a chuck at the time.  */
 122     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 123       {
 124         errno = 0;
 125         buf[i] = ptrace (PT_RUREGS, pid, (PTRACE_TYPE_ARG3) addr, 0, 0);
 126         if (errno != 0)
 127           error (_("Couldn't read register %s (#%d): %s"),
 128                  gdbarch_register_name (gdbarch, regnum),
 129                  regnum, safe_strerror (errno));
 130
 131         addr += sizeof (PTRACE_TYPE_RET);
 132       }
 133   }
 134 #endif
 135
 136   /* Take care with the "flags" register.  It's stored as an `int' in
 137      `struct save_state', even for 64-bit code.  */
 138   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 139     {
 140       ULONGEST flags;
 141       flags = extract_unsigned_integer ((gdb_byte *)buf, 4, byte_order);
 142       store_unsigned_integer ((gdb_byte *)buf, 8, byte_order, flags);
 143     }
 144
 145   regcache_raw_supply (regcache, regnum, buf);
 146 }
 147
 148 static void
 149 hppa_hpux_fetch_inferior_registers (struct target_ops *ops,
 150                                     struct regcache *regcache, int regnum)
 151 {
 152   if (regnum == -1)
 153     for (regnum = 0;
 154          regnum < gdbarch_num_regs (get_regcache_arch (regcache));
 155          regnum++)
 156       hppa_hpux_fetch_register (regcache, regnum);
 157   else
 158     hppa_hpux_fetch_register (regcache, regnum);
 159 }
 160
 161 /* Store register REGNUM into the inferior.  */
 162
 163 static void
 164 hppa_hpux_store_register (struct regcache *regcache, int regnum)
 165 {
 166   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 167   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 168   CORE_ADDR addr;
 169   size_t size;
 170   PTRACE_TYPE_RET *buf;
 171   pid_t pid;
 172
 173   pid = ptid_get_pid (inferior_ptid);
 174
 175   /* This isn't really an address, but ptrace thinks of it as one.  */
 176   addr = hppa_hpux_save_state_offset (regcache, regnum);
 177   size = register_size (gdbarch, regnum);
 178
 179   gdb_assert (size == 4 || size == 8);
 180   buf = alloca (size);
 181
 182   regcache_raw_collect (regcache, regnum, buf);
 183
 184   /* Take care with the "flags" register.  It's stored as an `int' in
 185      `struct save_state', even for 64-bit code.  */
 186   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 187     {
 188       ULONGEST flags;
 189       flags = extract_unsigned_integer ((gdb_byte *)buf, 8, byte_order);
 190       store_unsigned_integer ((gdb_byte *)buf, 4, byte_order, flags);
 191       size = 4;
 192     }
 193
 194 #ifdef HAVE_TTRACE
 195   {
 196     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 197
 198     if (ttrace (TT_LWP_WUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 199       error (_("Couldn't write register %s (#%d): %s"),
 200              gdbarch_register_name (gdbarch, regnum),
 201              regnum, safe_strerror (errno));
 202   }
 203 #else
 204   {
 205     int i;
 206
 207     /* Write the register contents into the inferior a chunk at the time.  */
 208     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 209       {
 210         errno = 0;
 211         ptrace (PT_WUREGS, pid, (PTRACE_TYPE_ARG3) addr, buf[i], 0);
 212         if (errno != 0)
 213           error (_("Couldn't write register %s (#%d): %s"),
 214                  gdbarch_register_name (gdbarch, regnum),
 215                  regnum, safe_strerror (errno));
 216
 217         addr += sizeof (PTRACE_TYPE_RET);
 218       }
 219   }
 220 #endif
 221 }
 222
 223 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 224    this for all registers (including the floating point registers).  */
 225
 226 static void
 227 hppa_hpux_store_inferior_registers (struct target_ops *ops,
 228                                     struct regcache *regcache, int regnum)
 229 {
 230   if (regnum == -1)
 231     for (regnum = 0;
 232          regnum < gdbarch_num_regs (get_regcache_arch (regcache));
 233          regnum++)
 234       hppa_hpux_store_register (regcache, regnum);
 235   else
 236     hppa_hpux_store_register (regcache, regnum);
 237 }
 238
 239 static int
 240 hppa_hpux_child_can_run (void)
 241 {
 242   /* This variable is controlled by modules that layer their own
 243      process structure atop that provided here.  The code in
 244      hpux-thread.c does this to support the HP-UX user-mode DCE
 245      threads.  */
 246   return !child_suppress_run;
 247 }
 248 \f
 249
 250 /* Prevent warning from -Wmissing-prototypes.  */
 251 void _initialize_hppa_hpux_nat (void);
 252
 253 void
 254 _initialize_hppa_hpux_nat (void)
 255 {
 256   struct target_ops *t;
 257
 258 #ifdef HAVE_TTRACE
 259   t = inf_ttrace_target ();
 260 #else
 261   t = inf_ptrace_target ();
 262 #endif
 263
 264   t->to_fetch_registers = hppa_hpux_fetch_inferior_registers;
 265   t->to_store_registers = hppa_hpux_store_inferior_registers;
 266   t->to_can_run = hppa_hpux_child_can_run;
 267
 268   add_target (t);
 269 }