gdb/riscv-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/riscv.
   2
   3    Copyright (C) 2018-2020 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 "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 "riscv-tdep.h"
  30 #include "riscv-fbsd-tdep.h"
  31 #include "inf-ptrace.h"
  32
  33 struct riscv_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 riscv_fbsd_nat_target the_riscv_fbsd_nat_target;
  40
  41 /* Determine if PT_GETREGS fetches REGNUM.  */
  42
  43 static bool
  44 getregs_supplies (int regnum)
  45 {
  46   return ((regnum >= RISCV_RA_REGNUM && regnum <= RISCV_PC_REGNUM)
  47           || regnum == RISCV_CSR_SSTATUS_REGNUM);
  48 }
  49
  50 /* Determine if PT_GETFPREGS fetches REGNUM.  */
  51
  52 static bool
  53 getfpregs_supplies (int regnum)
  54 {
  55   return ((regnum >= RISCV_FIRST_FP_REGNUM && regnum <= RISCV_LAST_FP_REGNUM)
  56           || regnum == RISCV_CSR_FCSR_REGNUM);
  57 }
  58
  59 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  60    for all registers.  */
  61
  62 void
  63 riscv_fbsd_nat_target::fetch_registers (struct regcache *regcache,
  64                                         int regnum)
  65 {
  66   pid_t pid = get_ptrace_pid (regcache->ptid ());
  67
  68   if (regnum == -1 || regnum == RISCV_ZERO_REGNUM)
  69     regcache->raw_supply_zeroed (RISCV_ZERO_REGNUM);
  70   if (regnum == -1 || getregs_supplies (regnum))
  71     {
  72       struct reg regs;
  73
  74       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  75         perror_with_name (_("Couldn't get registers"));
  76
  77       regcache->supply_regset (&riscv_fbsd_gregset, regnum, &regs,
  78                                sizeof (regs));
  79     }
  80
  81   if (regnum == -1 || getfpregs_supplies (regnum))
  82     {
  83       struct fpreg fpregs;
  84
  85       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
  86         perror_with_name (_("Couldn't get floating point status"));
  87
  88       regcache->supply_regset (&riscv_fbsd_fpregset, regnum, &fpregs,
  89                                sizeof (fpregs));
  90     }
  91 }
  92
  93 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  94    this for all registers.  */
  95
  96 void
  97 riscv_fbsd_nat_target::store_registers (struct regcache *regcache,
  98                                         int regnum)
  99 {
 100   pid_t pid = get_ptrace_pid (regcache->ptid ());
 101
 102   if (regnum == -1 || getregs_supplies (regnum))
 103     {
 104       struct reg regs;
 105
 106       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 107         perror_with_name (_("Couldn't get registers"));
 108
 109       regcache->collect_regset (&riscv_fbsd_gregset, regnum, &regs,
 110                                sizeof (regs));
 111
 112       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 113         perror_with_name (_("Couldn't write registers"));
 114     }
 115
 116   if (regnum == -1 || getfpregs_supplies (regnum))
 117     {
 118       struct fpreg fpregs;
 119
 120       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 121         perror_with_name (_("Couldn't get floating point status"));
 122
 123       regcache->collect_regset (&riscv_fbsd_fpregset, regnum, &fpregs,
 124                                 sizeof (fpregs));
 125
 126       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 127         perror_with_name (_("Couldn't write floating point status"));
 128     }
 129 }
 130
 131 void
 132 _initialize_riscv_fbsd_nat (void)
 133 {
 134   add_inf_child_target (&the_riscv_fbsd_nat_target);
 135 }