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) ®s, 0) == -1) 75 perror_with_name (_("Couldn't get registers")); 76 77 regcache->supply_regset (&riscv_fbsd_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_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) ®s, 0) == -1) 107 perror_with_name (_("Couldn't get registers")); 108 109 regcache->collect_regset (&riscv_fbsd_gregset, regnum, ®s, 110 sizeof (regs)); 111 112 if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 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 _initialize_riscv_fbsd_nat (); 132 void 133 _initialize_riscv_fbsd_nat () 134 { 135 add_inf_child_target (&the_riscv_fbsd_nat_target); 136 } 137