gdb/riscv-fbsd-nat.c

   1 /* Native-dependent code for FreeBSD/riscv.
   2
   3    Copyright (C) 2018-2019 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 "target.h"
  22
  23 #include <sys/types.h>
  24 #include <sys/ptrace.h>
  25 #include <machine/reg.h>
  26
  27 #include "fbsd-nat.h"
  28 #include "riscv-tdep.h"
  29 #include "riscv-fbsd-tdep.h"
  30 #include "inf-ptrace.h"
  31
  32 struct riscv_fbsd_nat_target final : public fbsd_nat_target
  33 {
  34   void fetch_registers (struct regcache *, int) override;
  35   void store_registers (struct regcache *, int) override;
  36 };
  37
  38 static riscv_fbsd_nat_target the_riscv_fbsd_nat_target;
  39
  40 /* Determine if PT_GETREGS fetches REGNUM.  */
  41
  42 static bool
  43 getregs_supplies (struct gdbarch *gdbarch, int regnum)
  44 {
  45   return ((regnum >= RISCV_RA_REGNUM && regnum <= RISCV_PC_REGNUM)
  46           || regnum == RISCV_CSR_SSTATUS_REGNUM);
  47 }
  48
  49 /* Determine if PT_GETFPREGS fetches REGNUM.  */
  50
  51 static bool
  52 getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
  53 {
  54   return ((regnum >= RISCV_FIRST_FP_REGNUM && regnum <= RISCV_LAST_FP_REGNUM)
  55           || regnum == RISCV_CSR_FCSR_REGNUM);
  56 }
  57
  58 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  59    for all registers.  */
  60
  61 void
  62 riscv_fbsd_nat_target::fetch_registers (struct regcache *regcache,
  63                                         int regnum)
  64 {
  65   pid_t pid = get_ptrace_pid (regcache->ptid ());
  66
  67   struct gdbarch *gdbarch = regcache->arch ();
  68   if (regnum == -1 || regnum == RISCV_ZERO_REGNUM)
  69     regcache->raw_supply_zeroed (RISCV_ZERO_REGNUM);
  70   if (regnum == -1 || getregs_supplies (gdbarch, 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 (gdbarch, 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   struct gdbarch *gdbarch = regcache->arch ();
 103   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
 104     {
 105       struct reg regs;
 106
 107       if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 108         perror_with_name (_("Couldn't get registers"));
 109
 110       regcache->collect_regset (&riscv_fbsd_gregset, regnum, &regs,
 111                                sizeof (regs));
 112
 113       if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 114         perror_with_name (_("Couldn't write registers"));
 115     }
 116
 117   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
 118     {
 119       struct fpreg fpregs;
 120
 121       if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 122         perror_with_name (_("Couldn't get floating point status"));
 123
 124       regcache->collect_regset (&riscv_fbsd_fpregset, regnum, &fpregs,
 125                                 sizeof (fpregs));
 126
 127       if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 128         perror_with_name (_("Couldn't write floating point status"));
 129     }
 130 }
 131
 132 void
 133 _initialize_riscv_fbsd_nat (void)
 134 {
 135   add_inf_child_target (&the_riscv_fbsd_nat_target);
 136 }