1 /* Native-dependent code for NetBSD/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 "netbsd-nat.h" 29 #include "riscv-tdep.h" 30 #include "riscv-netbsd-tdep.h" 31 #include "inf-ptrace.h" 32 33 struct riscv_nbsd_nat_target final : public nbsd_nat_target 34 { 35 void fetch_registers (struct regcache *, int) override; 36 void store_registers (struct regcache *, int) override; 37 }; 38 39 static riscv_nbsd_nat_target the_riscv_nbsd_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 } 48 49 /* Determine if PT_GETFPREGS fetches REGNUM. */ 50 51 static bool 52 getfpregs_supplies (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_nbsd_nat_target::fetch_registers (struct regcache *regcache, 63 int regnum) 64 { 65 pid_t pid = regcache->ptid ().pid (); 66 int lwp = regcache->ptid ().lwp (); 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) ®s, lwp) == -1) 75 perror_with_name (_("Couldn't get registers")); 76 77 regcache->supply_regset (&riscv_nbsd_gregset, regnum, ®s, 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_nbsd_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_nbsd_nat_target::store_registers (struct regcache *regcache, 98 int regnum) 99 { 100 pid_t pid = regcache->ptid ().pid (); 101 int lwp = regcache->ptid ().lwp (); 102 103 if (regnum == -1 || getregs_supplies (regnum)) 104 { 105 struct reg regs; 106 107 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) 108 perror_with_name (_("Couldn't get registers")); 109 110 regcache->collect_regset (&riscv_nbsd_gregset, regnum, ®s, 111 sizeof (regs)); 112 113 if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) 114 perror_with_name (_("Couldn't write registers")); 115 } 116 117 if (regnum == -1 || getfpregs_supplies (regnum)) 118 { 119 struct fpreg fpregs; 120 121 if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) 122 perror_with_name (_("Couldn't get floating point status")); 123 124 regcache->collect_regset (&riscv_nbsd_fpregset, regnum, &fpregs, 125 sizeof (fpregs)); 126 127 if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) 128 perror_with_name (_("Couldn't write floating point status")); 129 } 130 } 131 132 /* Initialize RISC-V NetBSD native support. */ 133 134 void _initialize_riscv_nbsd_nat (); 135 void 136 _initialize_riscv_nbsd_nat () 137 { 138 add_inf_child_target (&the_riscv_nbsd_nat_target); 139 140 // bsd_kvm_add_target (riscv_nbsd_supply_pcb); 141 } 142