gdb/alpha-bsd-nat.c

   1 /* Native-dependent code for Alpha BSD's.
   2
   3    Copyright (C) 2000-2017 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
  24 #include "alpha-tdep.h"
  25 #include "alpha-bsd-tdep.h"
  26 #include "inf-ptrace.h"
  27
  28 #include <sys/types.h>
  29 #include <sys/ptrace.h>
  30 #include <machine/reg.h>
  31
  32 #ifdef HAVE_SYS_PROCFS_H
  33 #include <sys/procfs.h>
  34 #endif
  35
  36 #ifndef HAVE_GREGSET_T
  37 typedef struct reg gregset_t;
  38 #endif
  39
  40 #ifndef HAVE_FPREGSET_T
  41 typedef struct fpreg fpregset_t;
  42 #endif
  43
  44 #include "gregset.h"
  45
  46 /* Provide *regset() wrappers around the generic Alpha BSD register
  47    supply/fill routines.  */
  48
  49 void
  50 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
  51 {
  52   alphabsd_supply_reg (regcache, (const char *) gregsetp, -1);
  53 }
  54
  55 void
  56 fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
  57 {
  58   alphabsd_fill_reg (regcache, (char *) gregsetp, regno);
  59 }
  60
  61 void
  62 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
  63 {
  64   alphabsd_supply_fpreg (regcache, (const char *) fpregsetp, -1);
  65 }
  66
  67 void
  68 fill_fpregset (const struct regcache *regcache,
  69                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, ptid_get_pid (regcache_get_ptid (regcache)),
  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
 104       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 105     {
 106       struct fpreg fpregs;
 107
 108       if (ptrace (PT_GETFPREGS, ptid_get_pid (regcache_get_ptid (regcache)),
 109                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 110         perror_with_name (_("Couldn't get floating point status"));
 111
 112       alphabsd_supply_fpreg (regcache, (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 (struct target_ops *ops,
 121                                    struct regcache *regcache, int regno)
 122 {
 123   if (regno == -1 || getregs_supplies (regno))
 124     {
 125       struct reg gregs;
 126       if (ptrace (PT_GETREGS, ptid_get_pid (regcache_get_ptid (regcache)),
 127                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 128         perror_with_name (_("Couldn't get registers"));
 129
 130       alphabsd_fill_reg (regcache, (char *) &gregs, regno);
 131
 132       if (ptrace (PT_SETREGS, ptid_get_pid (regcache_get_ptid (regcache)),
 133                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 134         perror_with_name (_("Couldn't write registers"));
 135
 136       if (regno != -1)
 137         return;
 138     }
 139
 140   if (regno == -1
 141       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 142     {
 143       struct fpreg fpregs;
 144
 145       if (ptrace (PT_GETFPREGS, ptid_get_pid (regcache_get_ptid (regcache)),
 146                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 147         perror_with_name (_("Couldn't get floating point status"));
 148
 149       alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 150
 151       if (ptrace (PT_SETFPREGS, ptid_get_pid (regcache_get_ptid (regcache)),
 152                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 153         perror_with_name (_("Couldn't write floating point status"));
 154     }
 155 }
 156 \f
 157
 158 /* Support for debugging kernel virtual memory images.  */
 159
 160 #include <sys/signal.h>
 161 #include <machine/pcb.h>
 162
 163 #include "bsd-kvm.h"
 164
 165 static int
 166 alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 167 {
 168   int regnum;
 169
 170   /* The following is true for OpenBSD 3.9:
 171
 172      The pcb contains the register state at the context switch inside
 173      cpu_switch().  */
 174
 175   /* The stack pointer shouldn't be zero.  */
 176   if (pcb->pcb_hw.apcb_ksp == 0)
 177     return 0;
 178
 179   regcache_raw_supply (regcache, ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
 180
 181   for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
 182     regcache_raw_supply (regcache, regnum,
 183                          &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
 184   regcache_raw_supply (regcache, ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
 185
 186   return 1;
 187 }
 188 \f
 189
 190 void
 191 _initialize_alphabsd_nat (void)
 192 {
 193   struct target_ops *t;
 194
 195   t = inf_ptrace_target ();
 196   t->to_fetch_registers = alphabsd_fetch_inferior_registers;
 197   t->to_store_registers = alphabsd_store_inferior_registers;
 198   add_target (t);
 199
 200   /* Support debugging kernel virtual memory images.  */
 201   bsd_kvm_add_target (alphabsd_supply_pcb);
 202 }