| 1 | /* Native-dependent code for FreeBSD/arm. |
| 2 | |
| 3 | Copyright (C) 2017-2020 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 "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 "arm-tdep.h" |
| 29 | #include "arm-fbsd-tdep.h" |
| 30 | #include "inf-ptrace.h" |
| 31 | |
| 32 | struct arm_fbsd_nat_target : public fbsd_nat_target |
| 33 | { |
| 34 | void fetch_registers (struct regcache *, int) override; |
| 35 | void store_registers (struct regcache *, int) override; |
| 36 | const struct target_desc *read_description () override; |
| 37 | }; |
| 38 | |
| 39 | static arm_fbsd_nat_target the_arm_fbsd_nat_target; |
| 40 | |
| 41 | /* Determine if PT_GETREGS fetches REGNUM. */ |
| 42 | |
| 43 | static bool |
| 44 | getregs_supplies (int regnum) |
| 45 | { |
| 46 | return ((regnum >= ARM_A1_REGNUM && regnum <= ARM_PC_REGNUM) |
| 47 | || regnum == ARM_PS_REGNUM); |
| 48 | } |
| 49 | |
| 50 | #ifdef PT_GETVFPREGS |
| 51 | /* Determine if PT_GETVFPREGS fetches REGNUM. */ |
| 52 | |
| 53 | static bool |
| 54 | getvfpregs_supplies (int regnum) |
| 55 | { |
| 56 | return ((regnum >= ARM_D0_REGNUM && regnum <= ARM_D31_REGNUM) |
| 57 | || regnum == ARM_FPSCR_REGNUM); |
| 58 | } |
| 59 | #endif |
| 60 | |
| 61 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
| 62 | for all registers. */ |
| 63 | |
| 64 | void |
| 65 | arm_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum) |
| 66 | { |
| 67 | pid_t pid = get_ptrace_pid (regcache->ptid ()); |
| 68 | |
| 69 | if (regnum == -1 || getregs_supplies (regnum)) |
| 70 | { |
| 71 | struct reg regs; |
| 72 | |
| 73 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 74 | perror_with_name (_("Couldn't get registers")); |
| 75 | |
| 76 | regcache->supply_regset (&arm_fbsd_gregset, regnum, ®s, |
| 77 | sizeof (regs)); |
| 78 | } |
| 79 | |
| 80 | #ifdef PT_GETVFPREGS |
| 81 | if (regnum == -1 || getvfpregs_supplies (regnum)) |
| 82 | { |
| 83 | struct vfpreg vfpregs; |
| 84 | |
| 85 | if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1) |
| 86 | perror_with_name (_("Couldn't get floating point status")); |
| 87 | |
| 88 | regcache->supply_regset (&arm_fbsd_vfpregset, regnum, &vfpregs, |
| 89 | sizeof (vfpregs)); |
| 90 | } |
| 91 | #endif |
| 92 | } |
| 93 | |
| 94 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
| 95 | this for all registers. */ |
| 96 | |
| 97 | void |
| 98 | arm_fbsd_nat_target::store_registers (struct regcache *regcache, 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 (&arm_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 | #ifdef PT_GETVFPREGS |
| 117 | if (regnum == -1 || getvfpregs_supplies (regnum)) |
| 118 | { |
| 119 | struct vfpreg vfpregs; |
| 120 | |
| 121 | if (ptrace (PT_GETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1) |
| 122 | perror_with_name (_("Couldn't get floating point status")); |
| 123 | |
| 124 | regcache->collect_regset (&arm_fbsd_vfpregset, regnum, &vfpregs, |
| 125 | sizeof (vfpregs)); |
| 126 | |
| 127 | if (ptrace (PT_SETVFPREGS, pid, (PTRACE_TYPE_ARG3) &vfpregs, 0) == -1) |
| 128 | perror_with_name (_("Couldn't write floating point status")); |
| 129 | } |
| 130 | #endif |
| 131 | } |
| 132 | |
| 133 | /* Implement the to_read_description method. */ |
| 134 | |
| 135 | const struct target_desc * |
| 136 | arm_fbsd_nat_target::read_description () |
| 137 | { |
| 138 | const struct target_desc *desc; |
| 139 | |
| 140 | desc = arm_fbsd_read_description_auxv (this); |
| 141 | if (desc == NULL) |
| 142 | desc = this->beneath ()->read_description (); |
| 143 | return desc; |
| 144 | } |
| 145 | |
| 146 | void |
| 147 | _initialize_arm_fbsd_nat (void) |
| 148 | { |
| 149 | add_inf_child_target (&the_arm_fbsd_nat_target); |
| 150 | } |