gdb/hppabsd-nat.c

   1 /* Native-dependent code for HP PA-RISC BSD's.
   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 <sys/types.h>
  27 #include <sys/ptrace.h>
  28 #include <machine/reg.h>
  29
  30 #include "hppa-tdep.h"
  31 #include "inf-ptrace.h"
  32
  33 static int
  34 hppabsd_gregset_supplies_p (int regnum)
  35 {
  36   return (regnum >= HPPA_R0_REGNUM && regnum <= HPPA_PCOQ_TAIL_REGNUM);
  37 }
  38
  39 static int
  40 hppabsd_fpregset_supplies_p (int regnum)
  41 {
  42   return (regnum >= HPPA_FP0_REGNUM && regnum <= HPPA_FP31R_REGNUM);
  43 }
  44
  45 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  46
  47 static void
  48 hppabsd_supply_gregset (struct regcache *regcache, const void *gregs)
  49 {
  50   const char *regs = gregs;
  51   int regnum;
  52
  53   for (regnum = HPPA_R1_REGNUM; regnum <= HPPA_R31_REGNUM; regnum++)
  54     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  55
  56   regcache_raw_supply (regcache, HPPA_SAR_REGNUM, regs);
  57   regcache_raw_supply (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
  58   regcache_raw_supply (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
  59 }
  60
  61 /* Supply the floating-point registers stored in FPREGS to REGCACHE.  */
  62
  63 static void
  64 hppabsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
  65 {
  66   const char *regs = fpregs;
  67   int regnum;
  68
  69   for (regnum = HPPA_FP0_REGNUM; regnum <= HPPA_FP31R_REGNUM;
  70        regnum += 2, regs += 8)
  71     {
  72       regcache_raw_supply (regcache, regnum, regs);
  73       regcache_raw_supply (regcache, regnum + 1, regs + 4);
  74     }
  75 }
  76
  77 /* Collect the general-purpose registers from REGCACHE and store them
  78    in GREGS.  */
  79
  80 static void
  81 hppabsd_collect_gregset (const struct regcache *regcache,
  82                           void *gregs, int regnum)
  83 {
  84   char *regs = gregs;
  85   int i;
  86
  87   for (i = HPPA_R1_REGNUM; i <= HPPA_R31_REGNUM; i++)
  88     {
  89       if (regnum == -1 || regnum == i)
  90         regcache_raw_collect (regcache, i, regs + i * 4);
  91     }
  92
  93   if (regnum == -1 || regnum == HPPA_SAR_REGNUM)
  94     regcache_raw_collect (regcache, HPPA_SAR_REGNUM, regs);
  95   if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM)
  96     regcache_raw_collect (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
  97   if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
  98     regcache_raw_collect (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
  99 }
 100
 101 /* Collect the floating-point registers from REGCACHE and store them
 102    in FPREGS.  */
 103
 104 static void
 105 hppabsd_collect_fpregset (struct regcache *regcache,
 106                           void *fpregs, int regnum)
 107 {
 108   char *regs = fpregs;
 109   int i;
 110
 111   for (i = HPPA_FP0_REGNUM; i <= HPPA_FP31R_REGNUM; i += 2, regs += 8)
 112     {
 113       if (regnum == -1 || regnum == i || regnum == i + 1)
 114         {
 115           regcache_raw_collect (regcache, i, regs);
 116           regcache_raw_collect (regcache, i + 1, regs + 4);
 117         }
 118     }
 119 }
 120 \f
 121
 122 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
 123    for all registers (including the floating-point registers).  */
 124
 125 static void
 126 hppabsd_fetch_registers (struct target_ops *ops,
 127                          struct regcache *regcache, int regnum)
 128 {
 129   if (regnum == -1 || hppabsd_gregset_supplies_p (regnum))
 130     {
 131       struct reg regs;
 132
 133       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 134                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 135         perror_with_name (_("Couldn't get registers"));
 136
 137       hppabsd_supply_gregset (regcache, &regs);
 138     }
 139
 140   if (regnum == -1 || hppabsd_fpregset_supplies_p (regnum))
 141     {
 142       struct fpreg fpregs;
 143
 144       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 145                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 146         perror_with_name (_("Couldn't get floating point status"));
 147
 148       hppabsd_supply_fpregset (regcache, &fpregs);
 149     }
 150 }
 151
 152 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 153    this for all registers (including the floating-point registers).  */
 154
 155 static void
 156 hppabsd_store_registers (struct target_ops *ops,
 157                          struct regcache *regcache, int regnum)
 158 {
 159   if (regnum == -1 || hppabsd_gregset_supplies_p (regnum))
 160     {
 161       struct reg regs;
 162
 163       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 164                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 165         perror_with_name (_("Couldn't get registers"));
 166
 167       hppabsd_collect_gregset (regcache, &regs, regnum);
 168
 169       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 170                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 171         perror_with_name (_("Couldn't write registers"));
 172     }
 173
 174   if (regnum == -1 || hppabsd_fpregset_supplies_p (regnum))
 175     {
 176       struct fpreg fpregs;
 177
 178       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 179                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 180         perror_with_name (_("Couldn't get floating point status"));
 181
 182       hppabsd_collect_fpregset (regcache, &fpregs, regnum);
 183
 184       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 185                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 186         perror_with_name (_("Couldn't write floating point status"));
 187     }
 188 }
 189
 190 /* Provide a prototype to silence -Wmissing-prototypes.  */
 191 void _initialize_hppabsd_nat (void);
 192
 193 void
 194 _initialize_hppabsd_nat (void)
 195 {
 196   struct target_ops *t;
 197
 198   /* Add in local overrides.  */
 199   t = inf_ptrace_target ();
 200   t->to_fetch_registers = hppabsd_fetch_registers;
 201   t->to_store_registers = hppabsd_store_registers;
 202   add_target (t);
 203 }