gdb/alphabsd-nat.c

   1 /* Native-dependent code for Alpha BSD's.
   2
   3    Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
   4    2011 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
  25 #include "alpha-tdep.h"
  26 #include "alphabsd-tdep.h"
  27 #include "inf-ptrace.h"
  28
  29 #include <sys/types.h>
  30 #include <sys/ptrace.h>
  31 #include <machine/reg.h>
  32
  33 #ifdef HAVE_SYS_PROCFS_H
  34 #include <sys/procfs.h>
  35 #endif
  36
  37 #ifndef HAVE_GREGSET_T
  38 typedef struct reg gregset_t;
  39 #endif
  40
  41 #ifndef HAVE_FPREGSET_T
  42 typedef struct fpreg fpregset_t;
  43 #endif
  44
  45 #include "gregset.h"
  46
  47 /* Provide *regset() wrappers around the generic Alpha BSD register
  48    supply/fill routines.  */
  49
  50 void
  51 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
  52 {
  53   alphabsd_supply_reg (regcache, (const char *) gregsetp, -1);
  54 }
  55
  56 void
  57 fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
  58 {
  59   alphabsd_fill_reg (regcache, (char *) gregsetp, regno);
  60 }
  61
  62 void
  63 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
  64 {
  65   alphabsd_supply_fpreg (regcache, (const char *) fpregsetp, -1);
  66 }
  67
  68 void
  69 fill_fpregset (const struct regcache *regcache,
  70                fpregset_t *fpregsetp, int regno)
  71 {
  72   alphabsd_fill_fpreg (regcache, (char *) fpregsetp, regno);
  73 }
  74 \f
  75 /* Determine if PT_GETREGS fetches this register.  */
  76
  77 static int
  78 getregs_supplies (int regno)
  79 {
  80   return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
  81           || regno >= ALPHA_PC_REGNUM);
  82 }
  83
  84 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
  85    for all registers (including the floating point registers).  */
  86
  87 static void
  88 alphabsd_fetch_inferior_registers (struct target_ops *ops,
  89                                    struct regcache *regcache, 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 (regcache, (char *) &gregs, regno);
 100       if (regno != -1)
 101         return;
 102     }
 103
 104   if (regno == -1
 105       || regno >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))
 106     {
 107       struct fpreg fpregs;
 108
 109       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 110                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 111         perror_with_name (_("Couldn't get floating point status"));
 112
 113       alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);
 114     }
 115 }
 116
 117 /* Store register REGNO back into the inferior.  If REGNO is -1, do
 118    this for all registers (including the floating point registers).  */
 119
 120 static void
 121 alphabsd_store_inferior_registers (struct target_ops *ops,
 122                                    struct regcache *regcache, int regno)
 123 {
 124   if (regno == -1 || getregs_supplies (regno))
 125     {
 126       struct reg gregs;
 127       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 128                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 129         perror_with_name (_("Couldn't get registers"));
 130
 131       alphabsd_fill_reg (regcache, (char *) &gregs, regno);
 132
 133       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 134                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 135         perror_with_name (_("Couldn't write registers"));
 136
 137       if (regno != -1)
 138         return;
 139     }
 140
 141   if (regno == -1
 142       || regno >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))
 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       alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 151
 152       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 153                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 154         perror_with_name (_("Couldn't write floating point status"));
 155     }
 156 }
 157 \f
 158
 159 /* Support for debugging kernel virtual memory images.  */
 160
 161 #include <sys/types.h>
 162 #include <sys/signal.h>
 163 #include <machine/pcb.h>
 164
 165 #include "bsd-kvm.h"
 166
 167 static int
 168 alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 169 {
 170   int regnum;
 171
 172   /* The following is true for OpenBSD 3.9:
 173
 174      The pcb contains the register state at the context switch inside
 175      cpu_switch().  */
 176
 177   /* The stack pointer shouldn't be zero.  */
 178   if (pcb->pcb_hw.apcb_ksp == 0)
 179     return 0;
 180
 181   regcache_raw_supply (regcache, ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
 182
 183   for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
 184     regcache_raw_supply (regcache, regnum,
 185                          &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
 186   regcache_raw_supply (regcache, ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
 187
 188   return 1;
 189 }
 190 \f
 191
 192 /* Provide a prototype to silence -Wmissing-prototypes.  */
 193 void _initialize_alphabsd_nat (void);
 194
 195 void
 196 _initialize_alphabsd_nat (void)
 197 {
 198   struct target_ops *t;
 199
 200   t = inf_ptrace_target ();
 201   t->to_fetch_registers = alphabsd_fetch_inferior_registers;
 202   t->to_store_registers = alphabsd_store_inferior_registers;
 203   add_target (t);
 204
 205   /* Support debugging kernel virtual memory images.  */
 206   bsd_kvm_add_target (alphabsd_supply_pcb);
 207 }