gdb/hppa-hpux-nat.c

   1 /* Native-dependent code for PA-RISC HP-UX.
   2
   3    Copyright (C) 2004, 2005, 2007 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 2 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, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "defs.h"
  23 #include "inferior.h"
  24 #include "regcache.h"
  25 #include "target.h"
  26
  27 #include "gdb_assert.h"
  28 #include <sys/ptrace.h>
  29 #include <machine/save_state.h>
  30
  31 #ifdef HAVE_TTRACE
  32 #include <sys/ttrace.h>
  33 #endif
  34
  35 #include "hppa-tdep.h"
  36 #include "inf-ptrace.h"
  37 #include "inf-ttrace.h"
  38
  39 /* Non-zero if we should pretend not to be a runnable target.  */
  40 int child_suppress_run = 0;
  41
  42 /* Return the offset of register REGNUM within `struct save_state'.
  43    The offset returns depends on the flags in the "flags" register and
  44    the register size (32-bit or 64-bit).  These are taken from
  45    REGCACHE.  */
  46
  47 LONGEST
  48 hppa_hpux_save_state_offset (struct regcache *regcache, int regnum)
  49 {
  50   LONGEST offset;
  51
  52   if (regnum == HPPA_FLAGS_REGNUM)
  53     return ssoff (ss_flags);
  54
  55   if (HPPA_R0_REGNUM < regnum && regnum < HPPA_FP0_REGNUM)
  56     {
  57       struct gdbarch *arch = get_regcache_arch (regcache);
  58       size_t size = register_size (arch, HPPA_R1_REGNUM);
  59       ULONGEST flags;
  60
  61       gdb_assert (size == 4 || size == 8);
  62
  63       regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
  64       if (flags & SS_WIDEREGS)
  65         offset = ssoff (ss_wide) + (8 - size) + (regnum - HPPA_R0_REGNUM) * 8;
  66       else
  67         offset = ssoff (ss_narrow) + (regnum - HPPA_R1_REGNUM) * 4;
  68     }
  69   else
  70     {
  71       struct gdbarch *arch = get_regcache_arch (regcache);
  72       size_t size = register_size (arch, HPPA_FP0_REGNUM);
  73
  74       gdb_assert (size == 4 || size == 8);
  75       gdb_assert (regnum >= HPPA_FP0_REGNUM);
  76       offset = ssoff(ss_fpblock) + (regnum - HPPA_FP0_REGNUM) * size;
  77     }
  78
  79   gdb_assert (offset < sizeof (save_state_t));
  80   return offset;
  81 }
  82
  83 /* Just in case a future version of PA-RISC HP-UX won't have ptrace(2)
  84    at all.  */
  85 #ifndef PTRACE_TYPE_RET
  86 #define PTRACE_TYPE_RET void
  87 #endif
  88
  89 static void
  90 hppa_hpux_fetch_register (struct regcache *regcache, int regnum)
  91 {
  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 (current_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 (current_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 (current_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 = extract_unsigned_integer ((gdb_byte *)buf, 4);
 140       store_unsigned_integer ((gdb_byte *)buf, 8, flags);
 141     }
 142
 143   regcache_raw_supply (regcache, regnum, buf);
 144 }
 145
 146 static void
 147 hppa_hpux_fetch_inferior_registers (struct regcache *regcache, int regnum)
 148 {
 149   if (regnum == -1)
 150     for (regnum = 0; regnum < gdbarch_num_regs (current_gdbarch); regnum++)
 151       hppa_hpux_fetch_register (regcache, regnum);
 152   else
 153     hppa_hpux_fetch_register (regcache, regnum);
 154 }
 155
 156 /* Store register REGNUM into the inferior.  */
 157
 158 static void
 159 hppa_hpux_store_register (struct regcache *regcache, int regnum)
 160 {
 161   CORE_ADDR addr;
 162   size_t size;
 163   PTRACE_TYPE_RET *buf;
 164   pid_t pid;
 165
 166   pid = ptid_get_pid (inferior_ptid);
 167
 168   /* This isn't really an address, but ptrace thinks of it as one.  */
 169   addr = hppa_hpux_save_state_offset (regcache, regnum);
 170   size = register_size (current_gdbarch, regnum);
 171
 172   gdb_assert (size == 4 || size == 8);
 173   buf = alloca (size);
 174
 175   regcache_raw_collect (regcache, regnum, buf);
 176
 177   /* Take care with the "flags" register.  It's stored as an `int' in
 178      `struct save_state', even for 64-bit code.  */
 179   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 180     {
 181       ULONGEST flags = extract_unsigned_integer ((gdb_byte *)buf, 8);
 182       store_unsigned_integer ((gdb_byte *)buf, 4, flags);
 183       size = 4;
 184     }
 185
 186 #ifdef HAVE_TTRACE
 187   {
 188     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 189
 190     if (ttrace (TT_LWP_WUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 191       error (_("Couldn't write register %s (#%d): %s"),
 192              gdbarch_register_name (current_gdbarch, regnum),
 193              regnum, safe_strerror (errno));
 194   }
 195 #else
 196   {
 197     int i;
 198
 199     /* Write the register contents into the inferior a chunk at the time.  */
 200     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 201       {
 202         errno = 0;
 203         ptrace (PT_WUREGS, pid, (PTRACE_TYPE_ARG3) addr, buf[i], 0);
 204         if (errno != 0)
 205           error (_("Couldn't write register %s (#%d): %s"),
 206                  gdbarch_register_name (current_gdbarch, regnum),
 207                  regnum, safe_strerror (errno));
 208
 209         addr += sizeof (PTRACE_TYPE_RET);
 210       }
 211   }
 212 #endif
 213 }
 214
 215 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 216    this for all registers (including the floating point registers).  */
 217
 218 static void
 219 hppa_hpux_store_inferior_registers (struct regcache *regcache, int regnum)
 220 {
 221   if (regnum == -1)
 222     for (regnum = 0; regnum < gdbarch_num_regs (current_gdbarch); regnum++)
 223       hppa_hpux_store_register (regcache, regnum);
 224   else
 225     hppa_hpux_store_register (regcache, regnum);
 226 }
 227
 228 static int
 229 hppa_hpux_child_can_run (void)
 230 {
 231   /* This variable is controlled by modules that layer their own
 232      process structure atop that provided here.  The code in
 233      hpux-thread.c does this to support the HP-UX user-mode DCE
 234      threads.  */
 235   return !child_suppress_run;
 236 }
 237 \f
 238
 239 /* Prevent warning from -Wmissing-prototypes.  */
 240 void _initialize_hppa_hpux_nat (void);
 241
 242 void
 243 _initialize_hppa_hpux_nat (void)
 244 {
 245   struct target_ops *t;
 246
 247 #ifdef HAVE_TTRACE
 248   t = inf_ttrace_target ();
 249 #else
 250   t = inf_ptrace_target ();
 251 #endif
 252
 253   t->to_fetch_registers = hppa_hpux_fetch_inferior_registers;
 254   t->to_store_registers = hppa_hpux_store_inferior_registers;
 255   t->to_can_run = hppa_hpux_child_can_run;
 256
 257   add_target (t);
 258 }