gdb/mips-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/mips.
   2
   3    Copyright (C) 2017-2024 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 #include "inferior.h"
  21 #include "regcache.h"
  22 #include "target.h"
  23
  24 #include <sys/types.h>
  25 #include <sys/ptrace.h>
  26 #include <machine/reg.h>
  27
  28 #include "fbsd-nat.h"
  29 #include "mips-tdep.h"
  30 #include "mips-fbsd-tdep.h"
  31 #include "inf-ptrace.h"
  32
  33 struct mips_fbsd_nat_target final : public fbsd_nat_target
  34 {
  35   void fetch_registers (struct regcache *, int) override;
  36   void store_registers (struct regcache *, int) override;
  37 };
  38
  39 static mips_fbsd_nat_target the_mips_fbsd_nat_target;
  40
  41 /* Determine if PT_GETREGS fetches REGNUM.  */
  42
  43 static bool
  44 getregs_supplies (struct gdbarch *gdbarch, int regnum)
  45 {
  46   return (regnum >= MIPS_ZERO_REGNUM
  47           && regnum <= mips_regnum (gdbarch)->pc);
  48 }
  49
  50 /* Determine if PT_GETFPREGS fetches REGNUM.  */
  51
  52 static bool
  53 getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
  54 {
  55   return (regnum >= mips_regnum (gdbarch)->fp0
  56           && regnum <= mips_regnum (gdbarch)->fp_implementation_revision);
  57 }
  58
  59 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  60    for all registers.  */
  61
  62 void
  63 mips_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
  64 {
  65   pid_t pid = get_ptrace_pid (regcache->ptid ());
  66
  67   struct gdbarch *gdbarch = regcache->arch ();
  68   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  69     {
  70       struct reg regs;
  71
  72       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  73         perror_with_name (_("Couldn't get registers"));
  74
  75       mips_fbsd_supply_gregs (regcache, regnum, &regs, sizeof (register_t));
  76     }
  77
  78   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
  79     {
  80       struct fpreg fpregs;
  81
  82       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  83         perror_with_name (_("Couldn't get floating point status"));
  84
  85       mips_fbsd_supply_fpregs (regcache, regnum, &fpregs,
  86                                sizeof (f_register_t));
  87     }
  88 }
  89
  90 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  91    this for all registers.  */
  92
  93 void
  94 mips_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
  95 {
  96   pid_t pid = get_ptrace_pid (regcache->ptid ());
  97
  98   struct gdbarch *gdbarch = regcache->arch ();
  99   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
 100     {
 101       struct reg regs;
 102
 103       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 104         perror_with_name (_("Couldn't get registers"));
 105
 106       mips_fbsd_collect_gregs (regcache, regnum, (char *) &regs,
 107                                sizeof (register_t));
 108
 109       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 110         perror_with_name (_("Couldn't write registers"));
 111     }
 112
 113   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
 114     {
 115       struct fpreg fpregs;
 116
 117       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 118         perror_with_name (_("Couldn't get floating point status"));
 119
 120       mips_fbsd_collect_fpregs (regcache, regnum, (char *) &fpregs,
 121                                 sizeof (f_register_t));
 122
 123       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 124         perror_with_name (_("Couldn't write floating point status"));
 125     }
 126 }
 127
 128 void _initialize_mips_fbsd_nat ();
 129 void
 130 _initialize_mips_fbsd_nat ()
 131 {
 132   add_inf_child_target (&the_mips_fbsd_nat_target);
 133 }