| 1 | /* Native-dependent code for modern VAX BSD's. |
| 2 | |
| 3 | Copyright (C) 2004-2020 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 "inferior.h" |
| 22 | #include "regcache.h" |
| 23 | #include "target.h" |
| 24 | |
| 25 | #include <sys/types.h> |
| 26 | #include <sys/ptrace.h> |
| 27 | #include <machine/reg.h> |
| 28 | |
| 29 | #include "vax-tdep.h" |
| 30 | #include "inf-ptrace.h" |
| 31 | |
| 32 | struct vax_bsd_nat_target final : public inf_ptrace_target |
| 33 | { |
| 34 | void fetch_registers (struct regcache *, int) override; |
| 35 | void store_registers (struct regcache *, int) override; |
| 36 | }; |
| 37 | |
| 38 | static vax_bsd_nat_target the_vax_bsd_nat_target; |
| 39 | |
| 40 | /* Supply the general-purpose registers stored in GREGS to REGCACHE. */ |
| 41 | |
| 42 | static void |
| 43 | vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs) |
| 44 | { |
| 45 | const gdb_byte *regs = gregs; |
| 46 | int regnum; |
| 47 | |
| 48 | for (regnum = 0; regnum < VAX_NUM_REGS; regnum++) |
| 49 | regcache->raw_supply (regnum, regs + regnum * 4); |
| 50 | } |
| 51 | |
| 52 | /* Collect the general-purpose registers from REGCACHE and store them |
| 53 | in GREGS. */ |
| 54 | |
| 55 | static void |
| 56 | vaxbsd_collect_gregset (const struct regcache *regcache, |
| 57 | void *gregs, int regnum) |
| 58 | { |
| 59 | gdb_byte *regs = gregs; |
| 60 | int i; |
| 61 | |
| 62 | for (i = 0; i <= VAX_NUM_REGS; i++) |
| 63 | { |
| 64 | if (regnum == -1 || regnum == i) |
| 65 | regcache->raw_collect (i, regs + i * 4); |
| 66 | } |
| 67 | } |
| 68 | \f |
| 69 | |
| 70 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
| 71 | for all registers. */ |
| 72 | |
| 73 | void |
| 74 | vax_bsd_nat_target::fetch_registers (struct regcache *regcache, int regnum) |
| 75 | { |
| 76 | struct reg regs; |
| 77 | pid_t pid = regcache->ptid ().pid (); |
| 78 | |
| 79 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 80 | perror_with_name (_("Couldn't get registers")); |
| 81 | |
| 82 | vaxbsd_supply_gregset (regcache, ®s); |
| 83 | } |
| 84 | |
| 85 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
| 86 | this for all registers. */ |
| 87 | |
| 88 | void |
| 89 | vax_bsd_nat_target::store_registers (struct regcache *regcache, int regnum) |
| 90 | { |
| 91 | struct reg regs; |
| 92 | pid_t pid = regcache->ptid ().pid (); |
| 93 | |
| 94 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 95 | perror_with_name (_("Couldn't get registers")); |
| 96 | |
| 97 | vaxbsd_collect_gregset (regcache, ®s, regnum); |
| 98 | |
| 99 | if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 100 | perror_with_name (_("Couldn't write registers")); |
| 101 | } |
| 102 | \f |
| 103 | |
| 104 | /* Support for debugging kernel virtual memory images. */ |
| 105 | |
| 106 | #include <machine/pcb.h> |
| 107 | |
| 108 | #include "bsd-kvm.h" |
| 109 | |
| 110 | static int |
| 111 | vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) |
| 112 | { |
| 113 | int regnum; |
| 114 | |
| 115 | /* The following is true for OpenBSD 3.5: |
| 116 | |
| 117 | The pcb contains the register state at the context switch inside |
| 118 | cpu_switch(). */ |
| 119 | |
| 120 | /* The stack pointer shouldn't be zero. */ |
| 121 | if (pcb->KSP == 0) |
| 122 | return 0; |
| 123 | |
| 124 | for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++) |
| 125 | regcache->raw_supply (regnum, &pcb->R[regnum - VAX_R0_REGNUM]); |
| 126 | regcache->raw_supply (VAX_AP_REGNUM, &pcb->AP); |
| 127 | regcache->raw_supply (VAX_FP_REGNUM, &pcb->FP); |
| 128 | regcache->raw_supply (VAX_SP_REGNUM, &pcb->KSP); |
| 129 | regcache->raw_supply (VAX_PC_REGNUM, &pcb->PC); |
| 130 | regcache->raw_supply (VAX_PS_REGNUM, &pcb->PSL); |
| 131 | |
| 132 | return 1; |
| 133 | } |
| 134 | |
| 135 | void |
| 136 | _initialize_vaxbsd_nat (void) |
| 137 | { |
| 138 | add_inf_child_target (&the_vax_bsd_nat_target); |
| 139 | |
| 140 | /* Support debugging kernel virtual memory images. */ |
| 141 | bsd_kvm_add_target (vaxbsd_supply_pcb); |
| 142 | } |