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 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  41
  42 static void
  43 hppabsd_supply_gregset (struct regcache *regcache, const void *gregs)
  44 {
  45   const char *regs = gregs;
  46   int regnum;
  47
  48   for (regnum = HPPA_R1_REGNUM; regnum <= HPPA_R31_REGNUM; regnum++)
  49     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  50
  51   regcache_raw_supply (regcache, HPPA_SAR_REGNUM, regs);
  52   regcache_raw_supply (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
  53   regcache_raw_supply (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
  54 }
  55
  56 /* Collect the general-purpose registers from REGCACHE and store them
  57    in GREGS.  */
  58
  59 static void
  60 hppabsd_collect_gregset (const struct regcache *regcache,
  61                           void *gregs, int regnum)
  62 {
  63   char *regs = gregs;
  64   int i;
  65
  66   for (i = HPPA_R1_REGNUM; i <= HPPA_R31_REGNUM; i++)
  67     {
  68       if (regnum == -1 || regnum == i)
  69         regcache_raw_collect (regcache, i, regs + i * 4);
  70     }
  71
  72   if (regnum == -1 || regnum == HPPA_SAR_REGNUM)
  73     regcache_raw_collect (regcache, HPPA_SAR_REGNUM, regs);
  74   if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM)
  75     regcache_raw_collect (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
  76   if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
  77     regcache_raw_collect (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
  78 }
  79 \f
  80
  81 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  82    for all registers (including the floating-point registers).  */
  83
  84 static void
  85 hppabsd_fetch_registers (int regnum)
  86 {
  87   struct regcache *regcache = current_regcache;
  88
  89   if (regnum == -1 || hppabsd_gregset_supplies_p (regnum))
  90     {
  91       struct reg regs;
  92
  93       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  94                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  95         perror_with_name (_("Couldn't get registers"));
  96
  97       hppabsd_supply_gregset (regcache, &regs);
  98     }
  99 }
 100
 101 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 102    this for all registers (including the floating-point registers).  */
 103
 104 static void
 105 hppabsd_store_registers (int regnum)
 106 {
 107   if (regnum == -1 || hppabsd_gregset_supplies_p (regnum))
 108     {
 109       struct reg regs;
 110
 111       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 112                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 113         perror_with_name (_("Couldn't get registers"));
 114
 115       hppabsd_collect_gregset (current_regcache, &regs, regnum);
 116
 117       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 118                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 119         perror_with_name (_("Couldn't write registers"));
 120     }
 121 }
 122
 123 /* Provide a prototype to silence -Wmissing-prototypes.  */
 124 void _initialize_hppabsd_nat (void);
 125
 126 void
 127 _initialize_hppabsd_nat (void)
 128 {
 129   struct target_ops *t;
 130
 131   /* Add in local overrides.  */
 132   t = inf_ptrace_target ();
 133   t->to_fetch_registers = hppabsd_fetch_registers;
 134   t->to_store_registers = hppabsd_store_registers;
 135   add_target (t);
 136 }