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mips-fbsd-nat.c revision 1.1.1.5 
      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 }
    134