gdb/alpha-bsd-nat.c

   1 /* Native-dependent code for Alpha BSD's.
   2
   3    Copyright (C) 2000-2020 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 /* We define this to get types like register_t.  */
  21 #define _KERNTYPES
  22 #include "defs.h"
  23 #include "inferior.h"
  24 #include "regcache.h"
  25
  26 #include "alpha-tdep.h"
  27 #include "alpha-bsd-tdep.h"
  28 #include "inf-ptrace.h"
  29 #include "nbsd-nat.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 struct alpha_bsd_nat_target final : public nbsd_nat_target
  50 {
  51   void fetch_registers (struct regcache *, int) override;
  52   void store_registers (struct regcache *, int) override;
  53 };
  54
  55 static alpha_bsd_nat_target the_alpha_bsd_nat_target;
  56
  57 /* Provide *regset() wrappers around the generic Alpha BSD register
  58    supply/fill routines.  */
  59
  60 void
  61 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
  62 {
  63   alphabsd_supply_reg (regcache, (const char *) gregsetp, -1);
  64 }
  65
  66 void
  67 fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
  68 {
  69   alphabsd_fill_reg (regcache, (char *) gregsetp, regno);
  70 }
  71
  72 void
  73 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
  74 {
  75   alphabsd_supply_fpreg (regcache, (const char *) fpregsetp, -1);
  76 }
  77
  78 void
  79 fill_fpregset (const struct regcache *regcache,
  80                fpregset_t *fpregsetp, int regno)
  81 {
  82   alphabsd_fill_fpreg (regcache, (char *) fpregsetp, regno);
  83 }
  84 \f
  85 /* Determine if PT_GETREGS fetches this register.  */
  86
  87 static int
  88 getregs_supplies (int regno)
  89 {
  90   return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
  91           || regno >= ALPHA_PC_REGNUM);
  92 }
  93
  94 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
  95    for all registers (including the floating point registers).  */
  96
  97 void
  98 alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
  99 {
 100   if (regno == -1 || getregs_supplies (regno))
 101     {
 102       struct reg gregs;
 103
 104       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
 105                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 106         perror_with_name (_("Couldn't get registers"));
 107
 108       alphabsd_supply_reg (regcache, (char *) &gregs, regno);
 109       if (regno != -1)
 110         return;
 111     }
 112
 113   if (regno == -1
 114       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 115     {
 116       struct fpreg fpregs;
 117
 118       if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 119                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 120         perror_with_name (_("Couldn't get floating point status"));
 121
 122       alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);
 123     }
 124 }
 125
 126 /* Store register REGNO back into the inferior.  If REGNO is -1, do
 127    this for all registers (including the floating point registers).  */
 128
 129 void
 130 alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno)
 131 {
 132   if (regno == -1 || getregs_supplies (regno))
 133     {
 134       struct reg gregs;
 135       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
 136                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 137         perror_with_name (_("Couldn't get registers"));
 138
 139       alphabsd_fill_reg (regcache, (char *) &gregs, regno);
 140
 141       if (ptrace (PT_SETREGS, regcache->ptid ().pid (),
 142                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 143         perror_with_name (_("Couldn't write registers"));
 144
 145       if (regno != -1)
 146         return;
 147     }
 148
 149   if (regno == -1
 150       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 151     {
 152       struct fpreg fpregs;
 153
 154       if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 155                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 156         perror_with_name (_("Couldn't get floating point status"));
 157
 158       alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 159
 160       if (ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
 161                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 162         perror_with_name (_("Couldn't write floating point status"));
 163     }
 164 }
 165 \f
 166
 167 /* Support for debugging kernel virtual memory images.  */
 168
 169 #include <sys/signal.h>
 170 #include <machine/pcb.h>
 171
 172 #include "bsd-kvm.h"
 173
 174 static int
 175 alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 176 {
 177   int regnum;
 178
 179   /* The following is true for OpenBSD 3.9:
 180
 181      The pcb contains the register state at the context switch inside
 182      cpu_switch().  */
 183
 184   /* The stack pointer shouldn't be zero.  */
 185   if (pcb->pcb_hw.apcb_ksp == 0)
 186     return 0;
 187
 188   regcache->raw_supply (ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
 189
 190   for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
 191     regcache->raw_supply (regnum, &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
 192   regcache->raw_supply (ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
 193
 194   return 1;
 195 }
 196 \f
 197
 198 void _initialize_alphabsd_nat ();
 199 void
 200 _initialize_alphabsd_nat ()
 201 {
 202   add_inf_child_target (&the_alpha_bsd_nat_target);
 203
 204   /* Support debugging kernel virtual memory images.  */
 205   bsd_kvm_add_target (alphabsd_supply_pcb);
 206 }