gdb/alpha-bsd-nat.c

   1 /* Native-dependent code for Alpha BSD's.
   2
   3    Copyright (C) 2000-2019 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
  22 /* Standard C includes.  */
  23 #include <machine/reg.h>
  24 #ifdef HAVE_SYS_PROCFS_H
  25 #include <sys/procfs.h>
  26 #endif
  27 #include <sys/ptrace.h>
  28 #include <sys/types.h>
  29
  30 /* Local non-gdb includes.  */
  31 #include "alpha-bsd-tdep.h"
  32 #include "alpha-tdep.h"
  33 #include "inf-ptrace.h"
  34 #include "inferior.h"
  35 #include "regcache.h"
  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 struct alpha_bsd_nat_target final : public inf_ptrace_target
  48 {
  49   void fetch_registers (struct regcache *, int) override;
  50   void store_registers (struct regcache *, int) override;
  51 };
  52
  53 static alpha_bsd_nat_target the_alpha_bsd_nat_target;
  54
  55 /* Provide *regset() wrappers around the generic Alpha BSD register
  56    supply/fill routines.  */
  57
  58 void
  59 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
  60 {
  61   alphabsd_supply_reg (regcache, (const char *) gregsetp, -1);
  62 }
  63
  64 void
  65 fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
  66 {
  67   alphabsd_fill_reg (regcache, (char *) gregsetp, regno);
  68 }
  69
  70 void
  71 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
  72 {
  73   alphabsd_supply_fpreg (regcache, (const char *) fpregsetp, -1);
  74 }
  75
  76 void
  77 fill_fpregset (const struct regcache *regcache,
  78                fpregset_t *fpregsetp, int regno)
  79 {
  80   alphabsd_fill_fpreg (regcache, (char *) fpregsetp, regno);
  81 }
  82 \f
  83 /* Determine if PT_GETREGS fetches this register.  */
  84
  85 static int
  86 getregs_supplies (int regno)
  87 {
  88   return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
  89           || regno >= ALPHA_PC_REGNUM);
  90 }
  91
  92 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
  93    for all registers (including the floating point registers).  */
  94
  95 void
  96 alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
  97 {
  98   if (regno == -1 || getregs_supplies (regno))
  99     {
 100       struct reg gregs;
 101
 102       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
 103                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 104         perror_with_name (_("Couldn't get registers"));
 105
 106       alphabsd_supply_reg (regcache, (char *) &gregs, regno);
 107       if (regno != -1)
 108         return;
 109     }
 110
 111   if (regno == -1
 112       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 113     {
 114       struct fpreg fpregs;
 115
 116       if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 117                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 118         perror_with_name (_("Couldn't get floating point status"));
 119
 120       alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);
 121     }
 122 }
 123
 124 /* Store register REGNO back into the inferior.  If REGNO is -1, do
 125    this for all registers (including the floating point registers).  */
 126
 127 void
 128 alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno)
 129 {
 130   if (regno == -1 || getregs_supplies (regno))
 131     {
 132       struct reg gregs;
 133       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
 134                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 135         perror_with_name (_("Couldn't get registers"));
 136
 137       alphabsd_fill_reg (regcache, (char *) &gregs, regno);
 138
 139       if (ptrace (PT_SETREGS, regcache->ptid ().pid (),
 140                   (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
 141         perror_with_name (_("Couldn't write registers"));
 142
 143       if (regno != -1)
 144         return;
 145     }
 146
 147   if (regno == -1
 148       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
 149     {
 150       struct fpreg fpregs;
 151
 152       if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
 153                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 154         perror_with_name (_("Couldn't get floating point status"));
 155
 156       alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 157
 158       if (ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
 159                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 160         perror_with_name (_("Couldn't write floating point status"));
 161     }
 162 }
 163 \f
 164
 165 /* Support for debugging kernel virtual memory images.  */
 166
 167 #include <sys/signal.h>
 168 #include <machine/pcb.h>
 169
 170 #include "bsd-kvm.h"
 171
 172 static int
 173 alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 174 {
 175   int regnum;
 176
 177   /* The following is true for OpenBSD 3.9:
 178
 179      The pcb contains the register state at the context switch inside
 180      cpu_switch().  */
 181
 182   /* The stack pointer shouldn't be zero.  */
 183   if (pcb->pcb_hw.apcb_ksp == 0)
 184     return 0;
 185
 186   regcache->raw_supply (ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
 187
 188   for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
 189     regcache->raw_supply (regnum, &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
 190   regcache->raw_supply (ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
 191
 192   return 1;
 193 }
 194 \f
 195
 196 void
 197 _initialize_alphabsd_nat (void)
 198 {
 199   add_inf_child_target (&the_alpha_bsd_nat_target);
 200
 201   /* Support debugging kernel virtual memory images.  */
 202   bsd_kvm_add_target (alphabsd_supply_pcb);
 203 }