1 /* Native-dependent code for modern VAX BSD's. 2 3 Copyright (C) 2004-2019 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 #ifndef _KERNTYPES 21 #define _KERNTYPES 22 #endif 23 #include "defs.h" 24 #include "inferior.h" 25 #include "regcache.h" 26 #include "target.h" 27 28 #include <sys/types.h> 29 #include <sys/ptrace.h> 30 #include <machine/reg.h> 31 32 #include "vax-tdep.h" 33 #include "inf-ptrace.h" 34 35 #ifdef __NetBSD__ 36 #include "nbsd-nat.h" 37 struct vax_bsd_nat_target final : public nbsd_nat_target 38 #else 39 struct vax_bsd_nat_target final : public inf_ptrace_target 40 #endif 41 42 { 43 void fetch_registers (struct regcache *, int) override; 44 void store_registers (struct regcache *, int) override; 45 }; 46 47 static vax_bsd_nat_target the_vax_bsd_nat_target; 48 49 /* Supply the general-purpose registers stored in GREGS to REGCACHE. */ 50 51 static void 52 vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs) 53 { 54 const gdb_byte *regs = (const gdb_byte *)gregs; 55 int regnum; 56 57 for (regnum = 0; regnum < VAX_NUM_REGS; regnum++) 58 regcache->raw_supply (regnum, regs + regnum * 4); 59 } 60 61 /* Collect the general-purpose registers from REGCACHE and store them 62 in GREGS. */ 63 64 static void 65 vaxbsd_collect_gregset (const struct regcache *regcache, 66 void *gregs, int regnum) 67 { 68 gdb_byte *regs = (gdb_byte *)gregs; 69 int i; 70 71 for (i = 0; i <= VAX_NUM_REGS; i++) 72 { 73 if (regnum == -1 || regnum == i) 74 regcache->raw_collect (i, regs + i * 4); 75 } 76 } 77 78 79 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this 80 for all registers. */ 81 82 void 83 vax_bsd_nat_target::fetch_registers (struct regcache *regcache, int regnum) 84 { 85 struct reg regs; 86 ptid_t ptid = regcache->ptid (); 87 pid_t pid = ptid.pid (); 88 int lwp = ptid.lwp (); 89 90 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) 91 perror_with_name (_("Couldn't get registers")); 92 93 vaxbsd_supply_gregset (regcache, ®s); 94 } 95 96 /* Store register REGNUM back into the inferior. If REGNUM is -1, do 97 this for all registers. */ 98 99 void 100 vax_bsd_nat_target::store_registers (struct regcache *regcache, int regnum) 101 { 102 struct reg regs; 103 ptid_t ptid = regcache->ptid (); 104 pid_t pid = ptid.pid (); 105 int lwp = ptid.lwp (); 106 107 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) 108 perror_with_name (_("Couldn't get registers")); 109 110 vaxbsd_collect_gregset (regcache, ®s, regnum); 111 112 if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) 113 perror_with_name (_("Couldn't write registers")); 114 } 115 116 117 /* Support for debugging kernel virtual memory images. */ 118 119 #include <machine/pcb.h> 120 121 #include "bsd-kvm.h" 122 123 static int 124 vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) 125 { 126 int regnum; 127 128 /* The following is true for OpenBSD 3.5: 129 130 The pcb contains the register state at the context switch inside 131 cpu_switch(). */ 132 133 /* The stack pointer shouldn't be zero. */ 134 if (pcb->KSP == 0) 135 return 0; 136 137 for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++) 138 regcache->raw_supply (regnum, &pcb->R[regnum - VAX_R0_REGNUM]); 139 regcache->raw_supply (VAX_AP_REGNUM, &pcb->AP); 140 regcache->raw_supply (VAX_FP_REGNUM, &pcb->FP); 141 regcache->raw_supply (VAX_SP_REGNUM, &pcb->KSP); 142 regcache->raw_supply (VAX_PC_REGNUM, &pcb->PC); 143 regcache->raw_supply (VAX_PS_REGNUM, &pcb->PSL); 144 145 return 1; 146 } 147 148 void 149 _initialize_vaxbsd_nat (void) 150 { 151 add_inf_child_target (&the_vax_bsd_nat_target); 152 153 /* Support debugging kernel virtual memory images. */ 154 bsd_kvm_add_target (vaxbsd_supply_pcb); 155 } 156