gdb/alphabsd-nat.c

   1 /* Native-dependent code for Alpha BSD's.
   2
   3    Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006, 2007
   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 2 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, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 #include "defs.h"
  24 #include "inferior.h"
  25 #include "regcache.h"
  26
  27 #include "alpha-tdep.h"
  28 #include "alphabsd-tdep.h"
  29 #include "inf-ptrace.h"
  30
  31 #include <sys/types.h>
  32 #include <sys/ptrace.h>
  33 #include <machine/reg.h>
  34
  35 #ifdef HAVE_SYS_PROCFS_H
  36 #include <sys/procfs.h>
  37 #endif
  38
  39 #ifndef HAVE_GREGSET_T
  40 typedef struct reg gregset_t;
  41 #endif
  42
  43 #ifndef HAVE_FPREGSET_T
  44 typedef struct fpreg fpregset_t;
  45 #endif
  46
  47 #include "gregset.h"
  48
  49 /* Provide *regset() wrappers around the generic Alpha BSD register
  50    supply/fill routines.  */
  51
  52 void
  53 supply_gregset (gregset_t *gregsetp)
  54 {
  55   alphabsd_supply_reg ((char *) gregsetp, -1);
  56 }
  57
  58 void
  59 fill_gregset (gregset_t *gregsetp, int regno)
  60 {
  61   alphabsd_fill_reg ((char *) gregsetp, regno);
  62 }
  63
  64 void
  65 supply_fpregset (fpregset_t *fpregsetp)
  66 {
  67   alphabsd_supply_fpreg ((char *) fpregsetp, -1);
  68 }
  69
  70 void
  71 fill_fpregset (fpregset_t *fpregsetp, int regno)
  72 {
  73   alphabsd_fill_fpreg ((char *) fpregsetp, regno);
  74 }
  75 \f
  76 /* Determine if PT_GETREGS fetches this register.  */
  77
  78 static int
  79 getregs_supplies (int regno)
  80 {
  81   return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
  82           || regno >= ALPHA_PC_REGNUM);
  83 }
  84
  85 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
  86    for all registers (including the floating point registers).  */
  87
  88 static void
  89 alphabsd_fetch_inferior_registers (int regno)
  90 {
  91   if (regno == -1 || getregs_supplies (regno))
  92     {
  93       struct reg gregs;
  94
  95       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  96                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
  97         perror_with_name (_("Couldn't get registers"));
  98
  99       alphabsd_supply_reg ((char *) &gregs, regno);
 100       if (regno != -1)
 101         return;
 102     }
 103
 104   if (regno == -1 || regno >= FP0_REGNUM)
 105     {
 106       struct fpreg fpregs;
 107
 108       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 109                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 110         perror_with_name (_("Couldn't get floating point status"));
 111
 112       alphabsd_supply_fpreg ((char *) &fpregs, regno);
 113     }
 114 }
 115
 116 /* Store register REGNO back into the inferior.  If REGNO is -1, do
 117    this for all registers (including the floating point registers).  */
 118
 119 static void
 120 alphabsd_store_inferior_registers (int regno)
 121 {
 122   if (regno == -1 || getregs_supplies (regno))
 123     {
 124       struct reg gregs;
 125       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 126                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 127         perror_with_name (_("Couldn't get registers"));
 128
 129       alphabsd_fill_reg ((char *) &gregs, regno);
 130
 131       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 132                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 133         perror_with_name (_("Couldn't write registers"));
 134
 135       if (regno != -1)
 136         return;
 137     }
 138
 139   if (regno == -1 || regno >= FP0_REGNUM)
 140     {
 141       struct fpreg fpregs;
 142
 143       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 144                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 145         perror_with_name (_("Couldn't get floating point status"));
 146
 147       alphabsd_fill_fpreg ((char *) &fpregs, regno);
 148
 149       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 150                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 151         perror_with_name (_("Couldn't write floating point status"));
 152     }
 153 }
 154 \f
 155
 156 /* Support for debugging kernel virtual memory images.  */
 157
 158 #include <sys/types.h>
 159 #include <sys/signal.h>
 160 #include <machine/pcb.h>
 161
 162 #include "bsd-kvm.h"
 163
 164 static int
 165 alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 166 {
 167   int regnum;
 168
 169   /* The following is true for OpenBSD 3.9:
 170
 171      The pcb contains the register state at the context switch inside
 172      cpu_switch().  */
 173
 174   /* The stack pointer shouldn't be zero.  */
 175   if (pcb->pcb_hw.apcb_ksp == 0)
 176     return 0;
 177
 178   regcache_raw_supply (regcache, ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
 179
 180   for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
 181     regcache_raw_supply (regcache, regnum,
 182                          &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
 183   regcache_raw_supply (regcache, ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
 184
 185   return 1;
 186 }
 187 \f
 188
 189 /* Provide a prototype to silence -Wmissing-prototypes.  */
 190 void _initialize_alphabsd_nat (void);
 191
 192 void
 193 _initialize_alphabsd_nat (void)
 194 {
 195   struct target_ops *t;
 196
 197   t = inf_ptrace_target ();
 198   t->to_fetch_registers = alphabsd_fetch_inferior_registers;
 199   t->to_store_registers = alphabsd_store_inferior_registers;
 200   add_target (t);
 201
 202   /* Support debugging kernel virtual memory images.  */
 203   bsd_kvm_add_target (alphabsd_supply_pcb);
 204 }