gdb/mips-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/mips.
   2
   3    Copyright (C) 2017-2020 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 #include "target.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/ptrace.h>
  27 #include <machine/reg.h>
  28
  29 #include "fbsd-nat.h"
  30 #include "mips-tdep.h"
  31 #include "mips-fbsd-tdep.h"
  32 #include "inf-ptrace.h"
  33
  34 struct mips_fbsd_nat_target final : public fbsd_nat_target
  35 {
  36   void fetch_registers (struct regcache *, int) override;
  37   void store_registers (struct regcache *, int) override;
  38 };
  39
  40 static mips_fbsd_nat_target the_mips_fbsd_nat_target;
  41
  42 /* Determine if PT_GETREGS fetches REGNUM.  */
  43
  44 static bool
  45 getregs_supplies (struct gdbarch *gdbarch, int regnum)
  46 {
  47   return (regnum >= MIPS_ZERO_REGNUM
  48           && regnum <= mips_regnum (gdbarch)->pc);
  49 }
  50
  51 /* Determine if PT_GETFPREGS fetches REGNUM.  */
  52
  53 static bool
  54 getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
  55 {
  56   return (regnum >= mips_regnum (gdbarch)->fp0
  57           && regnum <= mips_regnum (gdbarch)->fp_implementation_revision);
  58 }
  59
  60 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  61    for all registers.  */
  62
  63 void
  64 mips_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
  65 {
  66   pid_t pid = get_ptrace_pid (regcache->ptid ());
  67
  68   struct gdbarch *gdbarch = regcache->arch ();
  69   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  70     {
  71       struct reg regs;
  72
  73       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  74         perror_with_name (_("Couldn't get registers"));
  75
  76       mips_fbsd_supply_gregs (regcache, regnum, &regs, sizeof (register_t));
  77     }
  78
  79   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
  80     {
  81       struct fpreg fpregs;
  82
  83       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  84         perror_with_name (_("Couldn't get floating point status"));
  85
  86       mips_fbsd_supply_fpregs (regcache, regnum, &fpregs,
  87                                sizeof (f_register_t));
  88     }
  89 }
  90
  91 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  92    this for all registers.  */
  93
  94 void
  95 mips_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
  96 {
  97   pid_t pid = get_ptrace_pid (regcache->ptid ());
  98
  99   struct gdbarch *gdbarch = regcache->arch ();
 100   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
 101     {
 102       struct reg regs;
 103
 104       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 105         perror_with_name (_("Couldn't get registers"));
 106
 107       mips_fbsd_collect_gregs (regcache, regnum, (char *) &regs,
 108                                sizeof (register_t));
 109
 110       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 111         perror_with_name (_("Couldn't write registers"));
 112     }
 113
 114   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
 115     {
 116       struct fpreg fpregs;
 117
 118       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 119         perror_with_name (_("Couldn't get floating point status"));
 120
 121       mips_fbsd_collect_fpregs (regcache, regnum, (char *) &fpregs,
 122                                 sizeof (f_register_t));
 123
 124       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 125         perror_with_name (_("Couldn't write floating point status"));
 126     }
 127 }
 128
 129 void
 130 _initialize_mips_fbsd_nat (void)
 131 {
 132   add_inf_child_target (&the_mips_fbsd_nat_target);
 133 }