gdb/hppabsd-nat.c

   1 /* Native-dependent code for HP PA-RISC BSD's.
   2
   3    Copyright (C) 2004, 2005 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 <sys/types.h>
  28 #include <sys/ptrace.h>
  29 #include <machine/reg.h>
  30
  31 #include "hppa-tdep.h"
  32 #include "inf-ptrace.h"
  33
  34 static int
  35 hppabsd_gregset_supplies_p (int regnum)
  36 {
  37   return (regnum >= HPPA_R0_REGNUM && regnum <= HPPA_PCOQ_TAIL_REGNUM);
  38 }
  39
  40 static int
  41 hppabsd_fpregset_supplies_p (int regnum)
  42 {
  43   return (regnum >= HPPA_FP0_REGNUM && regnum <= HPPA_FP31R_REGNUM);
  44 }
  45
  46 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  47
  48 static void
  49 hppabsd_supply_gregset (struct regcache *regcache, const void *gregs)
  50 {
  51   const char *regs = gregs;
  52   int regnum;
  53
  54   for (regnum = HPPA_R1_REGNUM; regnum <= HPPA_R31_REGNUM; regnum++)
  55     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  56
  57   regcache_raw_supply (regcache, HPPA_SAR_REGNUM, regs);
  58   regcache_raw_supply (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
  59   regcache_raw_supply (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
  60 }
  61
  62 /* Supply the floating-point registers stored in FPREGS to REGCACHE.  */
  63
  64 static void
  65 hppabsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
  66 {
  67   const char *regs = fpregs;
  68   int regnum;
  69
  70   for (regnum = HPPA_FP0_REGNUM; regnum <= HPPA_FP31R_REGNUM;
  71        regnum += 2, regs += 8)
  72     {
  73       regcache_raw_supply (regcache, regnum, regs);
  74       regcache_raw_supply (regcache, regnum + 1, regs + 4);
  75     }
  76 }
  77
  78 /* Collect the general-purpose registers from REGCACHE and store them
  79    in GREGS.  */
  80
  81 static void
  82 hppabsd_collect_gregset (const struct regcache *regcache,
  83                           void *gregs, int regnum)
  84 {
  85   char *regs = gregs;
  86   int i;
  87
  88   for (i = HPPA_R1_REGNUM; i <= HPPA_R31_REGNUM; i++)
  89     {
  90       if (regnum == -1 || regnum == i)
  91         regcache_raw_collect (regcache, i, regs + i * 4);
  92     }
  93
  94   if (regnum == -1 || regnum == HPPA_SAR_REGNUM)
  95     regcache_raw_collect (regcache, HPPA_SAR_REGNUM, regs);
  96   if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM)
  97     regcache_raw_collect (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
  98   if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
  99     regcache_raw_collect (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
 100 }
 101
 102 /* Collect the floating-point registers from REGCACHE and store them
 103    in FPREGS.  */
 104
 105 static void
 106 hppabsd_collect_fpregset (struct regcache *regcache,
 107                           void *fpregs, int regnum)
 108 {
 109   char *regs = fpregs;
 110   int i;
 111
 112   for (i = HPPA_FP0_REGNUM; i <= HPPA_FP31R_REGNUM; i += 2, regs += 8)
 113     {
 114       if (regnum == -1 || regnum == i || regnum == i + 1)
 115         {
 116           regcache_raw_collect (regcache, i, regs);
 117           regcache_raw_collect (regcache, i + 1, regs + 4);
 118         }
 119     }
 120 }
 121 \f
 122
 123 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
 124    for all registers (including the floating-point registers).  */
 125
 126 static void
 127 hppabsd_fetch_registers (int regnum)
 128 {
 129   struct regcache *regcache = current_regcache;
 130
 131   if (regnum == -1 || hppabsd_gregset_supplies_p (regnum))
 132     {
 133       struct reg regs;
 134
 135       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 136                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 137         perror_with_name (_("Couldn't get registers"));
 138
 139       hppabsd_supply_gregset (regcache, &regs);
 140     }
 141
 142   if (regnum == -1 || hppabsd_fpregset_supplies_p (regnum))
 143     {
 144       struct fpreg fpregs;
 145
 146       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 147                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 148         perror_with_name (_("Couldn't get floating point status"));
 149
 150       hppabsd_supply_fpregset (current_regcache, &fpregs);
 151     }
 152 }
 153
 154 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 155    this for all registers (including the floating-point registers).  */
 156
 157 static void
 158 hppabsd_store_registers (int regnum)
 159 {
 160   if (regnum == -1 || hppabsd_gregset_supplies_p (regnum))
 161     {
 162       struct reg regs;
 163
 164       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 165                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 166         perror_with_name (_("Couldn't get registers"));
 167
 168       hppabsd_collect_gregset (current_regcache, &regs, regnum);
 169
 170       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 171                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 172         perror_with_name (_("Couldn't write registers"));
 173     }
 174
 175   if (regnum == -1 || hppabsd_fpregset_supplies_p (regnum))
 176     {
 177       struct fpreg fpregs;
 178
 179       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 180                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 181         perror_with_name (_("Couldn't get floating point status"));
 182
 183       hppabsd_collect_fpregset (current_regcache, &fpregs, regnum);
 184
 185       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 186                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 187         perror_with_name (_("Couldn't write floating point status"));
 188     }
 189 }
 190
 191 /* Provide a prototype to silence -Wmissing-prototypes.  */
 192 void _initialize_hppabsd_nat (void);
 193
 194 void
 195 _initialize_hppabsd_nat (void)
 196 {
 197   struct target_ops *t;
 198
 199   /* Add in local overrides.  */
 200   t = inf_ptrace_target ();
 201   t->to_fetch_registers = hppabsd_fetch_registers;
 202   t->to_store_registers = hppabsd_store_registers;
 203   add_target (t);
 204 }