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 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   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 (current_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 (current_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 (current_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 = extract_unsigned_integer ((gdb_byte *)buf, 4);
 138       store_unsigned_integer ((gdb_byte *)buf, 8, flags);
 139     }
 140
 141   regcache_raw_supply (regcache, regnum, buf);
 142 }
 143
 144 static void
 145 hppa_hpux_fetch_inferior_registers (struct regcache *regcache, int regnum)
 146 {
 147   if (regnum == -1)
 148     for (regnum = 0; regnum < gdbarch_num_regs (current_gdbarch); regnum++)
 149       hppa_hpux_fetch_register (regcache, regnum);
 150   else
 151     hppa_hpux_fetch_register (regcache, regnum);
 152 }
 153
 154 /* Store register REGNUM into the inferior.  */
 155
 156 static void
 157 hppa_hpux_store_register (struct regcache *regcache, int regnum)
 158 {
 159   CORE_ADDR addr;
 160   size_t size;
 161   PTRACE_TYPE_RET *buf;
 162   pid_t pid;
 163
 164   pid = ptid_get_pid (inferior_ptid);
 165
 166   /* This isn't really an address, but ptrace thinks of it as one.  */
 167   addr = hppa_hpux_save_state_offset (regcache, regnum);
 168   size = register_size (current_gdbarch, regnum);
 169
 170   gdb_assert (size == 4 || size == 8);
 171   buf = alloca (size);
 172
 173   regcache_raw_collect (regcache, regnum, buf);
 174
 175   /* Take care with the "flags" register.  It's stored as an `int' in
 176      `struct save_state', even for 64-bit code.  */
 177   if (regnum == HPPA_FLAGS_REGNUM && size == 8)
 178     {
 179       ULONGEST flags = extract_unsigned_integer ((gdb_byte *)buf, 8);
 180       store_unsigned_integer ((gdb_byte *)buf, 4, flags);
 181       size = 4;
 182     }
 183
 184 #ifdef HAVE_TTRACE
 185   {
 186     lwpid_t lwp = ptid_get_lwp (inferior_ptid);
 187
 188     if (ttrace (TT_LWP_WUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
 189       error (_("Couldn't write register %s (#%d): %s"),
 190              gdbarch_register_name (current_gdbarch, regnum),
 191              regnum, safe_strerror (errno));
 192   }
 193 #else
 194   {
 195     int i;
 196
 197     /* Write the register contents into the inferior a chunk at the time.  */
 198     for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
 199       {
 200         errno = 0;
 201         ptrace (PT_WUREGS, pid, (PTRACE_TYPE_ARG3) addr, buf[i], 0);
 202         if (errno != 0)
 203           error (_("Couldn't write register %s (#%d): %s"),
 204                  gdbarch_register_name (current_gdbarch, regnum),
 205                  regnum, safe_strerror (errno));
 206
 207         addr += sizeof (PTRACE_TYPE_RET);
 208       }
 209   }
 210 #endif
 211 }
 212
 213 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 214    this for all registers (including the floating point registers).  */
 215
 216 static void
 217 hppa_hpux_store_inferior_registers (struct regcache *regcache, int regnum)
 218 {
 219   if (regnum == -1)
 220     for (regnum = 0; regnum < gdbarch_num_regs (current_gdbarch); regnum++)
 221       hppa_hpux_store_register (regcache, regnum);
 222   else
 223     hppa_hpux_store_register (regcache, regnum);
 224 }
 225
 226 static int
 227 hppa_hpux_child_can_run (void)
 228 {
 229   /* This variable is controlled by modules that layer their own
 230      process structure atop that provided here.  The code in
 231      hpux-thread.c does this to support the HP-UX user-mode DCE
 232      threads.  */
 233   return !child_suppress_run;
 234 }
 235 \f
 236
 237 /* Prevent warning from -Wmissing-prototypes.  */
 238 void _initialize_hppa_hpux_nat (void);
 239
 240 void
 241 _initialize_hppa_hpux_nat (void)
 242 {
 243   struct target_ops *t;
 244
 245 #ifdef HAVE_TTRACE
 246   t = inf_ttrace_target ();
 247 #else
 248   t = inf_ptrace_target ();
 249 #endif
 250
 251   t->to_fetch_registers = hppa_hpux_fetch_inferior_registers;
 252   t->to_store_registers = hppa_hpux_store_inferior_registers;
 253   t->to_can_run = hppa_hpux_child_can_run;
 254
 255   add_target (t);
 256 }