1/* Native-dependent code for Alpha BSD's. 2 3 Copyright (C) 2000-2020 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/* We define this to get types like register_t. */ 21#include "defs.h" 22#include "inferior.h" 23#include "regcache.h" 24 25#include "alpha-tdep.h" 26#include "alpha-bsd-tdep.h" 27#include "inf-ptrace.h" 28#include "nbsd-nat.h" 29 30#include <sys/types.h> 31#include <sys/ptrace.h> 32#include <machine/reg.h> 33 34struct alpha_bsd_nat_target final : public nbsd_nat_target 35{ 36 void fetch_registers (struct regcache *, int) override; 37 void store_registers (struct regcache *, int) override; 38}; 39 40static alpha_bsd_nat_target the_alpha_bsd_nat_target; 41 42/* Determine if PT_GETREGS fetches this register. */ 43 44static int 45getregs_supplies (int regno) 46{ 47 return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM) 48 || regno >= ALPHA_PC_REGNUM); 49} 50 51/* Fetch register REGNO from the inferior. If REGNO is -1, do this 52 for all registers (including the floating point registers). */ 53 54void 55alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno) 56{ 57 int lwp = regcache->ptid ().lwp (); 58 59 if (regno == -1 || getregs_supplies (regno)) 60 { 61 struct reg gregs; 62 63 if (ptrace (PT_GETREGS, regcache->ptid ().pid (), 64 (PTRACE_TYPE_ARG3) &gregs, lwp) == -1) 65 perror_with_name (_("Couldn't get registers")); 66 67 alphabsd_supply_reg (regcache, (char *) &gregs, regno); 68 if (regno != -1) 69 return; 70 } 71 72 if (regno == -1 73 || regno >= gdbarch_fp0_regnum (regcache->arch ())) 74 { 75 struct fpreg fpregs; 76 77 if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (), 78 (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) 79 perror_with_name (_("Couldn't get floating point status")); 80 81 alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno); 82 } 83} 84 85/* Store register REGNO back into the inferior. If REGNO is -1, do 86 this for all registers (including the floating point registers). */ 87 88void 89alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno) 90{ 91 int lwp = regcache->ptid ().lwp (); 92 93 if (regno == -1 || getregs_supplies (regno)) 94 { 95 struct reg gregs; 96 if (ptrace (PT_GETREGS, regcache->ptid ().pid (), 97 (PTRACE_TYPE_ARG3) &gregs, lwp) == -1) 98 perror_with_name (_("Couldn't get registers")); 99 100 alphabsd_fill_reg (regcache, (char *) &gregs, regno); 101 102 if (ptrace (PT_SETREGS, regcache->ptid ().pid (), 103 (PTRACE_TYPE_ARG3) &gregs, lwp) == -1) 104 perror_with_name (_("Couldn't write registers")); 105 106 if (regno != -1) 107 return; 108 } 109 110 if (regno == -1 111 || regno >= gdbarch_fp0_regnum (regcache->arch ())) 112 { 113 struct fpreg fpregs; 114 115 if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (), 116 (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) 117 perror_with_name (_("Couldn't get floating point status")); 118 119 alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno); 120 121 if (ptrace (PT_SETFPREGS, regcache->ptid ().pid (), 122 (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) 123 perror_with_name (_("Couldn't write floating point status")); 124 } 125} 126 127 128/* Support for debugging kernel virtual memory images. */ 129 130#include <sys/signal.h> 131#include <machine/pcb.h> 132 133#include "bsd-kvm.h" 134 135static int 136alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) 137{ 138 int regnum; 139 140 /* The following is true for OpenBSD 3.9: 141 142 The pcb contains the register state at the context switch inside 143 cpu_switch(). */ 144 145 /* The stack pointer shouldn't be zero. */ 146 if (pcb->pcb_hw.apcb_ksp == 0) 147 return 0; 148 149 regcache->raw_supply (ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp); 150 151 for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++) 152 regcache->raw_supply (regnum, &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]); 153 regcache->raw_supply (ALPHA_RA_REGNUM, &pcb->pcb_context[7]); 154 155 return 1; 156} 157 158 159void _initialize_alphabsd_nat (); 160void 161_initialize_alphabsd_nat () 162{ 163 add_inf_child_target (&the_alpha_bsd_nat_target); 164 165 /* Support debugging kernel virtual memory images. */ 166 bsd_kvm_add_target (alphabsd_supply_pcb); 167} 168