gdb/alpha-bsd-nat.c

   1 /* Native-dependent code for Alpha BSD's.
   2
   3    Copyright (C) 2000-2024 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 "inferior.h"
  23 #include "regcache.h"
  24
  25 #include "alpha-tdep.h"
  26 #include "alpha-bsd-tdep.h"
  27 #include "inf-ptrace.h"
  28 #include "netbsd-nat.h"
  29
  30 #include <sys/types.h>
  31 #include <sys/ptrace.h>
  32 #include <machine/reg.h>
  33
  34 struct alpha_bsd_nat_target final : public nbsd_nat_target
  35 {
  36   void fetch_registers (struct regcache *, int) override;
  37   void store_registers (struct regcache *, int) override;
  38 };
  39
  40 static alpha_bsd_nat_target the_alpha_bsd_nat_target;
  41
  42 /* Determine if PT_GETREGS fetches this register.  */
  43
  44 static int
  45 getregs_supplies (int regno)
  46 {
  47   return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
  48           || regno >= ALPHA_PC_REGNUM);
  49 }
  50
  51 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
  52    for all registers (including the floating point registers).  */
  53
  54 void
  55 alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
  56 {
  57   int lwp = regcache->ptid ().lwp ();
  58
  59   if (regno == -1 || getregs_supplies (regno))
  60     {
  61       struct reg gregs;
  62
  63       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
  64                   (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
  65         perror_with_name (_("Couldn't get registers"));
  66
  67       alphabsd_supply_reg (regcache, (char *) &gregs, regno);
  68       if (regno != -1)
  69         return;
  70     }
  71
  72   if (regno == -1
  73       || regno >= gdbarch_fp0_regnum (regcache->arch ()))
  74     {
  75       struct fpreg fpregs;
  76
  77       if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
  78                   (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
  79         perror_with_name (_("Couldn't get floating point status"));
  80
  81       alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);
  82     }
  83 }
  84
  85 /* Store register REGNO back into the inferior.  If REGNO is -1, do
  86    this for all registers (including the floating point registers).  */
  87
  88 void
  89 alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno)
  90 {
  91   int lwp = regcache->ptid ().lwp ();
  92
  93   if (regno == -1 || getregs_supplies (regno))
  94     {
  95       struct reg gregs;
  96       if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
  97                   (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
  98         perror_with_name (_("Couldn't get registers"));
  99
 100       alphabsd_fill_reg (regcache, (char *) &gregs, regno);
 101
 102       if (ptrace (PT_SETREGS, regcache->ptid ().pid (),
 103                   (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
 104         perror_with_name (_("Couldn't write registers"));
 105
 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, lwp) == -1)
 117         perror_with_name (_("Couldn't get floating point status"));
 118
 119       alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);
 120
 121       if (ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
 122                   (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
 123         perror_with_name (_("Couldn't write floating point status"));
 124     }
 125 }
 126 \f
 127
 128 /* Support for debugging kernel virtual memory images.  */
 129
 130 #include <sys/signal.h>
 131 #include <machine/pcb.h>
 132
 133 #include "bsd-kvm.h"
 134
 135 static int
 136 alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 137 {
 138   int regnum;
 139
 140   /* The following is true for OpenBSD 3.9:
 141
 142      The pcb contains the register state at the context switch inside
 143      cpu_switch().  */
 144
 145   /* The stack pointer shouldn't be zero.  */
 146   if (pcb->pcb_hw.apcb_ksp == 0)
 147     return 0;
 148
 149   regcache->raw_supply (ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
 150
 151   for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
 152     regcache->raw_supply (regnum, &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
 153   regcache->raw_supply (ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
 154
 155   return 1;
 156 }
 157 \f
 158
 159 void _initialize_alphabsd_nat ();
 160 void
 161 _initialize_alphabsd_nat ()
 162 {
 163   add_inf_child_target (&the_alpha_bsd_nat_target);
 164
 165   /* Support debugging kernel virtual memory images.  */
 166   bsd_kvm_add_target (alphabsd_supply_pcb);
 167 }