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
  30 #include <sys/types.h>
  31 #include <sys/ptrace.h>
  32 #include <machine/reg.h>
  33
  34 #ifdef HAVE_SYS_PROCFS_H
  35 #include <sys/procfs.h>
  36 #endif
  37
  38 #ifndef HAVE_GREGSET_T
  39 typedef struct reg gregset_t;
  40 #endif
  41
  42 #ifndef HAVE_FPREGSET_T
  43 typedef struct fpreg fpregset_t;
  44 #endif
  45
  46 #include "gregset.h"
  47
  48 struct alpha_bsd_nat_target final : public inf_ptrace_target
  49 {
  50   void fetch_registers (struct regcache *, int) override;
  51   void store_registers (struct regcache *, int) override;
  52 };
  53
  54 static alpha_bsd_nat_target the_alpha_bsd_nat_target;
  55
  56 /* Provide *regset() wrappers around the generic Alpha BSD register
  57    supply/fill routines.  */
  58
  59 void
  60 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
  61 {
  62   alphabsd_supply_reg (regcache, (const char *) gregsetp, -1);
  63 }
  64
  65 void
  66 fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
  67 {
  68   alphabsd_fill_reg (regcache, (char *) gregsetp, regno);
  69 }
  70
  71 void
  72 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
  73 {
  74   alphabsd_supply_fpreg (regcache, (const char *) fpregsetp, -1);
  75 }
  76
  77 void
  78 fill_fpregset (const struct regcache *regcache,
  79                fpregset_t *fpregsetp, int regno)
  80 {
  81   alphabsd_fill_fpreg (regcache, (char *) fpregsetp, regno);
  82 }
  83 \f
  84 /* Determine if PT_GETREGS fetches this register.  */
  85
  86 static int
  87 getregs_supplies (int regno)
  88 {
  89   return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
  90           || regno >= ALPHA_PC_REGNUM);
  91 }
  92
  93 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
  94    for all registers (including the floating point registers).  */
  95
  96 void
  97 alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
  98 {
  99   if (regno == -1 || getregs_supplies (regno))
 100     {
 101       struct reg gregs;
 102
 103       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
 104                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 105         perror_with_name (_("Couldn't get registers"));
 106
 107       alphabsd_supply_reg (regcache, (char *) &gregs, regno);
 108       if (regno != -1)
 109         return;
 110     }
 111
 112   if (regno == -1
 113       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 114     {
 115       struct fpreg fpregs;
 116
 117       if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 118                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 119         perror_with_name (_("Couldn't get floating point status"));
 120
 121       alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);
 122     }
 123 }
 124
 125 /* Store register REGNO back into the inferior.  If REGNO is -1, do
 126    this for all registers (including the floating point registers).  */
 127
 128 void
 129 alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno)
 130 {
 131   if (regno == -1 || getregs_supplies (regno))
 132     {
 133       struct reg gregs;
 134       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
 135                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 136         perror_with_name (_("Couldn't get registers"));
 137
 138       alphabsd_fill_reg (regcache, (char *) &gregs, regno);
 139
 140       if (ptrace (PT_SETREGS, regcache->ptid ().pid (),
 141                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 142         perror_with_name (_("Couldn't write registers"));
 143
 144       if (regno != -1)
 145         return;
 146     }
 147
 148   if (regno == -1
 149       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 150     {
 151       struct fpreg fpregs;
 152
 153       if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 154                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 155         perror_with_name (_("Couldn't get floating point status"));
 156
 157       alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 158
 159       if (ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
 160                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 161         perror_with_name (_("Couldn't write floating point status"));
 162     }
 163 }
 164 \f
 165
 166 /* Support for debugging kernel virtual memory images.  */
 167
 168 #include <sys/signal.h>
 169 #include <machine/pcb.h>
 170
 171 #include "bsd-kvm.h"
 172
 173 static int
 174 alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 175 {
 176   int regnum;
 177
 178   /* The following is true for OpenBSD 3.9:
 179
 180      The pcb contains the register state at the context switch inside
 181      cpu_switch().  */
 182
 183   /* The stack pointer shouldn't be zero.  */
 184   if (pcb->pcb_hw.apcb_ksp == 0)
 185     return 0;
 186
 187   regcache->raw_supply (ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
 188
 189   for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
 190     regcache->raw_supply (regnum, &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
 191   regcache->raw_supply (ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
 192
 193   return 1;
 194 }
 195 \f
 196
 197 void _initialize_alphabsd_nat ();
 198 void
 199 _initialize_alphabsd_nat ()
 200 {
 201   add_inf_child_target (&the_alpha_bsd_nat_target);
 202
 203   /* Support debugging kernel virtual memory images.  */
 204   bsd_kvm_add_target (alphabsd_supply_pcb);
 205 }