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 #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 struct alpha_bsd_nat_target final : public inf_ptrace_target
  47 {
  48   void fetch_registers (struct regcache *, int) override;
  49   void store_registers (struct regcache *, int) override;
  50 };
  51
  52 static alpha_bsd_nat_target the_alpha_bsd_nat_target;
  53
  54 /* Provide *regset() wrappers around the generic Alpha BSD register
  55    supply/fill routines.  */
  56
  57 void
  58 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
  59 {
  60   alphabsd_supply_reg (regcache, (const char *) gregsetp, -1);
  61 }
  62
  63 void
  64 fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
  65 {
  66   alphabsd_fill_reg (regcache, (char *) gregsetp, regno);
  67 }
  68
  69 void
  70 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
  71 {
  72   alphabsd_supply_fpreg (regcache, (const char *) fpregsetp, -1);
  73 }
  74
  75 void
  76 fill_fpregset (const struct regcache *regcache,
  77                fpregset_t *fpregsetp, int regno)
  78 {
  79   alphabsd_fill_fpreg (regcache, (char *) fpregsetp, regno);
  80 }
  81 \f
  82 /* Determine if PT_GETREGS fetches this register.  */
  83
  84 static int
  85 getregs_supplies (int regno)
  86 {
  87   return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
  88           || regno >= ALPHA_PC_REGNUM);
  89 }
  90
  91 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
  92    for all registers (including the floating point registers).  */
  93
  94 void
  95 alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
  96 {
  97   if (regno == -1 || getregs_supplies (regno))
  98     {
  99       struct reg gregs;
 100
 101       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
 102                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 103         perror_with_name (_("Couldn't get registers"));
 104
 105       alphabsd_supply_reg (regcache, (char *) &gregs, regno);
 106       if (regno != -1)
 107         return;
 108     }
 109
 110   if (regno == -1
 111       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 112     {
 113       struct fpreg fpregs;
 114
 115       if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 116                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 117         perror_with_name (_("Couldn't get floating point status"));
 118
 119       alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);
 120     }
 121 }
 122
 123 /* Store register REGNO back into the inferior.  If REGNO is -1, do
 124    this for all registers (including the floating point registers).  */
 125
 126 void
 127 alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno)
 128 {
 129   if (regno == -1 || getregs_supplies (regno))
 130     {
 131       struct reg gregs;
 132       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
 133                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 134         perror_with_name (_("Couldn't get registers"));
 135
 136       alphabsd_fill_reg (regcache, (char *) &gregs, regno);
 137
 138       if (ptrace (PT_SETREGS, regcache->ptid ().pid (),
 139                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 140         perror_with_name (_("Couldn't write registers"));
 141
 142       if (regno != -1)
 143         return;
 144     }
 145
 146   if (regno == -1
 147       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 148     {
 149       struct fpreg fpregs;
 150
 151       if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 152                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 153         perror_with_name (_("Couldn't get floating point status"));
 154
 155       alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 156
 157       if (ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
 158                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 159         perror_with_name (_("Couldn't write floating point status"));
 160     }
 161 }
 162 \f
 163
 164 /* Support for debugging kernel virtual memory images.  */
 165
 166 #include <sys/signal.h>
 167 #include <machine/pcb.h>
 168
 169 #include "bsd-kvm.h"
 170
 171 static int
 172 alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 173 {
 174   int regnum;
 175
 176   /* The following is true for OpenBSD 3.9:
 177
 178      The pcb contains the register state at the context switch inside
 179      cpu_switch().  */
 180
 181   /* The stack pointer shouldn't be zero.  */
 182   if (pcb->pcb_hw.apcb_ksp == 0)
 183     return 0;
 184
 185   regcache->raw_supply (ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
 186
 187   for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
 188     regcache->raw_supply (regnum, &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
 189   regcache->raw_supply (ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
 190
 191   return 1;
 192 }
 193 \f
 194
 195 void
 196 _initialize_alphabsd_nat (void)
 197 {
 198   add_inf_child_target (&the_alpha_bsd_nat_target);
 199
 200   /* Support debugging kernel virtual memory images.  */
 201   bsd_kvm_add_target (alphabsd_supply_pcb);
 202 }