gdb/hppabsd-nat.c

   1 /* Native-dependent code for HP PA-RISC BSD's.
   2
   3    Copyright (C) 2004, 2005, 2007, 2008 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 <sys/types.h>
  26 #include <sys/ptrace.h>
  27 #include <machine/reg.h>
  28
  29 #include "hppa-tdep.h"
  30 #include "inf-ptrace.h"
  31
  32 static int
  33 hppabsd_gregset_supplies_p (int regnum)
  34 {
  35   return (regnum >= HPPA_R0_REGNUM && regnum <= HPPA_PCOQ_TAIL_REGNUM);
  36 }
  37
  38 static int
  39 hppabsd_fpregset_supplies_p (int regnum)
  40 {
  41   return (regnum >= HPPA_FP0_REGNUM && regnum <= HPPA_FP31R_REGNUM);
  42 }
  43
  44 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  45
  46 static void
  47 hppabsd_supply_gregset (struct regcache *regcache, const void *gregs)
  48 {
  49   const char *regs = gregs;
  50   int regnum;
  51
  52   for (regnum = HPPA_R1_REGNUM; regnum <= HPPA_R31_REGNUM; regnum++)
  53     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  54
  55   regcache_raw_supply (regcache, HPPA_SAR_REGNUM, regs);
  56   regcache_raw_supply (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
  57   regcache_raw_supply (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
  58 }
  59
  60 /* Supply the floating-point registers stored in FPREGS to REGCACHE.  */
  61
  62 static void
  63 hppabsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
  64 {
  65   const char *regs = fpregs;
  66   int regnum;
  67
  68   for (regnum = HPPA_FP0_REGNUM; regnum <= HPPA_FP31R_REGNUM;
  69        regnum += 2, regs += 8)
  70     {
  71       regcache_raw_supply (regcache, regnum, regs);
  72       regcache_raw_supply (regcache, regnum + 1, regs + 4);
  73     }
  74 }
  75
  76 /* Collect the general-purpose registers from REGCACHE and store them
  77    in GREGS.  */
  78
  79 static void
  80 hppabsd_collect_gregset (const struct regcache *regcache,
  81                           void *gregs, int regnum)
  82 {
  83   char *regs = gregs;
  84   int i;
  85
  86   for (i = HPPA_R1_REGNUM; i <= HPPA_R31_REGNUM; i++)
  87     {
  88       if (regnum == -1 || regnum == i)
  89         regcache_raw_collect (regcache, i, regs + i * 4);
  90     }
  91
  92   if (regnum == -1 || regnum == HPPA_SAR_REGNUM)
  93     regcache_raw_collect (regcache, HPPA_SAR_REGNUM, regs);
  94   if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM)
  95     regcache_raw_collect (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
  96   if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
  97     regcache_raw_collect (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
  98 }
  99
 100 /* Collect the floating-point registers from REGCACHE and store them
 101    in FPREGS.  */
 102
 103 static void
 104 hppabsd_collect_fpregset (struct regcache *regcache,
 105                           void *fpregs, int regnum)
 106 {
 107   char *regs = fpregs;
 108   int i;
 109
 110   for (i = HPPA_FP0_REGNUM; i <= HPPA_FP31R_REGNUM; i += 2, regs += 8)
 111     {
 112       if (regnum == -1 || regnum == i || regnum == i + 1)
 113         {
 114           regcache_raw_collect (regcache, i, regs);
 115           regcache_raw_collect (regcache, i + 1, regs + 4);
 116         }
 117     }
 118 }
 119 \f
 120
 121 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
 122    for all registers (including the floating-point registers).  */
 123
 124 static void
 125 hppabsd_fetch_registers (struct regcache *regcache, int regnum)
 126 {
 127   if (regnum == -1 || hppabsd_gregset_supplies_p (regnum))
 128     {
 129       struct reg regs;
 130
 131       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 132                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 133         perror_with_name (_("Couldn't get registers"));
 134
 135       hppabsd_supply_gregset (regcache, &regs);
 136     }
 137
 138   if (regnum == -1 || hppabsd_fpregset_supplies_p (regnum))
 139     {
 140       struct fpreg fpregs;
 141
 142       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 143                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 144         perror_with_name (_("Couldn't get floating point status"));
 145
 146       hppabsd_supply_fpregset (regcache, &fpregs);
 147     }
 148 }
 149
 150 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 151    this for all registers (including the floating-point registers).  */
 152
 153 static void
 154 hppabsd_store_registers (struct regcache *regcache, int regnum)
 155 {
 156   if (regnum == -1 || hppabsd_gregset_supplies_p (regnum))
 157     {
 158       struct reg regs;
 159
 160       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 161                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 162         perror_with_name (_("Couldn't get registers"));
 163
 164       hppabsd_collect_gregset (regcache, &regs, regnum);
 165
 166       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 167                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 168         perror_with_name (_("Couldn't write registers"));
 169     }
 170
 171   if (regnum == -1 || hppabsd_fpregset_supplies_p (regnum))
 172     {
 173       struct fpreg fpregs;
 174
 175       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 176                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 177         perror_with_name (_("Couldn't get floating point status"));
 178
 179       hppabsd_collect_fpregset (regcache, &fpregs, regnum);
 180
 181       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 182                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 183         perror_with_name (_("Couldn't write floating point status"));
 184     }
 185 }
 186
 187 /* Provide a prototype to silence -Wmissing-prototypes.  */
 188 void _initialize_hppabsd_nat (void);
 189
 190 void
 191 _initialize_hppabsd_nat (void)
 192 {
 193   struct target_ops *t;
 194
 195   /* Add in local overrides.  */
 196   t = inf_ptrace_target ();
 197   t->to_fetch_registers = hppabsd_fetch_registers;
 198   t->to_store_registers = hppabsd_store_registers;
 199   add_target (t);
 200 }