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
   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 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, fpregset_t *fpregsetp, int regno)
  70 {
  71   alphabsd_fill_fpreg (regcache, (char *) fpregsetp, regno);
  72 }
  73 \f
  74 /* Determine if PT_GETREGS fetches this register.  */
  75
  76 static int
  77 getregs_supplies (int regno)
  78 {
  79   return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
  80           || regno >= ALPHA_PC_REGNUM);
  81 }
  82
  83 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
  84    for all registers (including the floating point registers).  */
  85
  86 static void
  87 alphabsd_fetch_inferior_registers (struct target_ops *ops,
  88                                    struct regcache *regcache, int regno)
  89 {
  90   if (regno == -1 || getregs_supplies (regno))
  91     {
  92       struct reg gregs;
  93
  94       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  95                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
  96         perror_with_name (_("Couldn't get registers"));
  97
  98       alphabsd_supply_reg (regcache, (char *) &gregs, regno);
  99       if (regno != -1)
 100         return;
 101     }
 102
 103   if (regno == -1 || regno >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))
 104     {
 105       struct fpreg fpregs;
 106
 107       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 108                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 109         perror_with_name (_("Couldn't get floating point status"));
 110
 111       alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);
 112     }
 113 }
 114
 115 /* Store register REGNO back into the inferior.  If REGNO is -1, do
 116    this for all registers (including the floating point registers).  */
 117
 118 static void
 119 alphabsd_store_inferior_registers (struct target_ops *ops,
 120                                    struct regcache *regcache, 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 (regcache, (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 >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))
 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 (regcache, (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 }