| 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 | #include "defs.h" |
| 21 | #include "inferior.h" |
| 22 | #include "regcache.h" |
| 23 | |
| 24 | #include "alpha-tdep.h" |
| 25 | #include "alpha-bsd-tdep.h" |
| 26 | #include "inf-ptrace.h" |
| 27 | |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/ptrace.h> |
| 30 | #include <machine/reg.h> |
| 31 | |
| 32 | #ifdef HAVE_SYS_PROCFS_H |
| 33 | #include <sys/procfs.h> |
| 34 | #endif |
| 35 | |
| 36 | #ifndef HAVE_GREGSET_T |
| 37 | typedef struct reg gregset_t; |
| 38 | #endif |
| 39 | |
| 40 | #ifndef HAVE_FPREGSET_T |
| 41 | typedef struct fpreg fpregset_t; |
| 42 | #endif |
| 43 | |
| 44 | #include "gregset.h" |
| 45 | |
| 46 | struct alpha_bsd_nat_target final : public inf_ptrace_target |
| 47 | { |
| 48 | void fetch_registers (struct regcache *, int) override; |
| 49 | void store_registers (struct regcache *, int) override; |
| 50 | }; |
| 51 | |
| 52 | static alpha_bsd_nat_target the_alpha_bsd_nat_target; |
| 53 | |
| 54 | /* Provide *regset() wrappers around the generic Alpha BSD register |
| 55 | supply/fill routines. */ |
| 56 | |
| 57 | void |
| 58 | supply_gregset (struct regcache *regcache, const gregset_t *gregsetp) |
| 59 | { |
| 60 | alphabsd_supply_reg (regcache, (const char *) gregsetp, -1); |
| 61 | } |
| 62 | |
| 63 | void |
| 64 | fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno) |
| 65 | { |
| 66 | alphabsd_fill_reg (regcache, (char *) gregsetp, regno); |
| 67 | } |
| 68 | |
| 69 | void |
| 70 | supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp) |
| 71 | { |
| 72 | alphabsd_supply_fpreg (regcache, (const char *) fpregsetp, -1); |
| 73 | } |
| 74 | |
| 75 | void |
| 76 | fill_fpregset (const struct regcache *regcache, |
| 77 | fpregset_t *fpregsetp, int regno) |
| 78 | { |
| 79 | alphabsd_fill_fpreg (regcache, (char *) fpregsetp, regno); |
| 80 | } |
| 81 | \f |
| 82 | /* Determine if PT_GETREGS fetches this register. */ |
| 83 | |
| 84 | static int |
| 85 | getregs_supplies (int regno) |
| 86 | { |
| 87 | return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM) |
| 88 | || regno >= ALPHA_PC_REGNUM); |
| 89 | } |
| 90 | |
| 91 | /* Fetch register REGNO from the inferior. If REGNO is -1, do this |
| 92 | for all registers (including the floating point registers). */ |
| 93 | |
| 94 | void |
| 95 | alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno) |
| 96 | { |
| 97 | if (regno == -1 || getregs_supplies (regno)) |
| 98 | { |
| 99 | struct reg gregs; |
| 100 | |
| 101 | if (ptrace (PT_GETREGS, regcache->ptid ().pid (), |
| 102 | (PTRACE_TYPE_ARG3) &gregs, 0) == -1) |
| 103 | perror_with_name (_("Couldn't get registers")); |
| 104 | |
| 105 | alphabsd_supply_reg (regcache, (char *) &gregs, regno); |
| 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, 0) == -1) |
| 117 | perror_with_name (_("Couldn't get floating point status")); |
| 118 | |
| 119 | alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /* Store register REGNO back into the inferior. If REGNO is -1, do |
| 124 | this for all registers (including the floating point registers). */ |
| 125 | |
| 126 | void |
| 127 | alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno) |
| 128 | { |
| 129 | if (regno == -1 || getregs_supplies (regno)) |
| 130 | { |
| 131 | struct reg gregs; |
| 132 | if (ptrace (PT_GETREGS, regcache->ptid ().pid (), |
| 133 | (PTRACE_TYPE_ARG3) &gregs, 0) == -1) |
| 134 | perror_with_name (_("Couldn't get registers")); |
| 135 | |
| 136 | alphabsd_fill_reg (regcache, (char *) &gregs, regno); |
| 137 | |
| 138 | if (ptrace (PT_SETREGS, regcache->ptid ().pid (), |
| 139 | (PTRACE_TYPE_ARG3) &gregs, 0) == -1) |
| 140 | perror_with_name (_("Couldn't write registers")); |
| 141 | |
| 142 | if (regno != -1) |
| 143 | return; |
| 144 | } |
| 145 | |
| 146 | if (regno == -1 |
| 147 | || regno >= gdbarch_fp0_regnum (regcache->arch ())) |
| 148 | { |
| 149 | struct fpreg fpregs; |
| 150 | |
| 151 | if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (), |
| 152 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 153 | perror_with_name (_("Couldn't get floating point status")); |
| 154 | |
| 155 | alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno); |
| 156 | |
| 157 | if (ptrace (PT_SETFPREGS, regcache->ptid ().pid (), |
| 158 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 159 | perror_with_name (_("Couldn't write floating point status")); |
| 160 | } |
| 161 | } |
| 162 | \f |
| 163 | |
| 164 | /* Support for debugging kernel virtual memory images. */ |
| 165 | |
| 166 | #include <sys/signal.h> |
| 167 | #include <machine/pcb.h> |
| 168 | |
| 169 | #include "bsd-kvm.h" |
| 170 | |
| 171 | static int |
| 172 | alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) |
| 173 | { |
| 174 | int regnum; |
| 175 | |
| 176 | /* The following is true for OpenBSD 3.9: |
| 177 | |
| 178 | The pcb contains the register state at the context switch inside |
| 179 | cpu_switch(). */ |
| 180 | |
| 181 | /* The stack pointer shouldn't be zero. */ |
| 182 | if (pcb->pcb_hw.apcb_ksp == 0) |
| 183 | return 0; |
| 184 | |
| 185 | regcache->raw_supply (ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp); |
| 186 | |
| 187 | for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++) |
| 188 | regcache->raw_supply (regnum, &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]); |
| 189 | regcache->raw_supply (ALPHA_RA_REGNUM, &pcb->pcb_context[7]); |
| 190 | |
| 191 | return 1; |
| 192 | } |
| 193 | \f |
| 194 | |
| 195 | void |
| 196 | _initialize_alphabsd_nat (void) |
| 197 | { |
| 198 | add_inf_child_target (&the_alpha_bsd_nat_target); |
| 199 | |
| 200 | /* Support debugging kernel virtual memory images. */ |
| 201 | bsd_kvm_add_target (alphabsd_supply_pcb); |
| 202 | } |