| 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 "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 |
| 132 | _initialize_riscv_fbsd_nat (void) |
| 133 | { |
| 134 | add_inf_child_target (&the_riscv_fbsd_nat_target); |
| 135 | } |