| 1 | /* Native-dependent code for Motorola 68000 BSD's. |
| 2 | |
| 3 | Copyright (C) 2004-2016 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 "gdbcore.h" |
| 22 | #include "inferior.h" |
| 23 | #include "regcache.h" |
| 24 | |
| 25 | #include <sys/types.h> |
| 26 | #include <sys/ptrace.h> |
| 27 | #include <machine/reg.h> |
| 28 | |
| 29 | #include "m68k-tdep.h" |
| 30 | #include "inf-ptrace.h" |
| 31 | |
| 32 | static int |
| 33 | m68kbsd_gregset_supplies_p (int regnum) |
| 34 | { |
| 35 | return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM); |
| 36 | } |
| 37 | |
| 38 | static int |
| 39 | m68kbsd_fpregset_supplies_p (int regnum) |
| 40 | { |
| 41 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM); |
| 42 | } |
| 43 | |
| 44 | /* Supply the general-purpose registers stored in GREGS to REGCACHE. */ |
| 45 | |
| 46 | static void |
| 47 | m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs) |
| 48 | { |
| 49 | const char *regs = gregs; |
| 50 | int regnum; |
| 51 | |
| 52 | for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++) |
| 53 | regcache_raw_supply (regcache, regnum, regs + regnum * 4); |
| 54 | } |
| 55 | |
| 56 | /* Supply the floating-point registers stored in FPREGS to REGCACHE. */ |
| 57 | |
| 58 | static void |
| 59 | m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs) |
| 60 | { |
| 61 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 62 | const char *regs = fpregs; |
| 63 | int regnum; |
| 64 | |
| 65 | for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++) |
| 66 | regcache_raw_supply (regcache, regnum, |
| 67 | regs + m68kbsd_fpreg_offset (gdbarch, regnum)); |
| 68 | } |
| 69 | |
| 70 | /* Collect the general-purpose registers from REGCACHE and store them |
| 71 | in GREGS. */ |
| 72 | |
| 73 | static void |
| 74 | m68kbsd_collect_gregset (const struct regcache *regcache, |
| 75 | void *gregs, int regnum) |
| 76 | { |
| 77 | char *regs = gregs; |
| 78 | int i; |
| 79 | |
| 80 | for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++) |
| 81 | { |
| 82 | if (regnum == -1 || regnum == i) |
| 83 | regcache_raw_collect (regcache, i, regs + i * 4); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | /* Collect the floating-point registers from REGCACHE and store them |
| 88 | in FPREGS. */ |
| 89 | |
| 90 | static void |
| 91 | m68kbsd_collect_fpregset (struct regcache *regcache, |
| 92 | void *fpregs, int regnum) |
| 93 | { |
| 94 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 95 | char *regs = fpregs; |
| 96 | int i; |
| 97 | |
| 98 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) |
| 99 | { |
| 100 | if (regnum == -1 || regnum == i) |
| 101 | regcache_raw_collect (regcache, i, |
| 102 | regs + m68kbsd_fpreg_offset (gdbarch, i)); |
| 103 | } |
| 104 | } |
| 105 | \f |
| 106 | |
| 107 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
| 108 | for all registers (including the floating-point registers). */ |
| 109 | |
| 110 | static void |
| 111 | m68kbsd_fetch_inferior_registers (struct target_ops *ops, |
| 112 | struct regcache *regcache, int regnum) |
| 113 | { |
| 114 | if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) |
| 115 | { |
| 116 | struct reg regs; |
| 117 | |
| 118 | if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid), |
| 119 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 120 | perror_with_name (_("Couldn't get registers")); |
| 121 | |
| 122 | m68kbsd_supply_gregset (regcache, ®s); |
| 123 | } |
| 124 | |
| 125 | if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) |
| 126 | { |
| 127 | struct fpreg fpregs; |
| 128 | |
| 129 | if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid), |
| 130 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 131 | perror_with_name (_("Couldn't get floating point status")); |
| 132 | |
| 133 | m68kbsd_supply_fpregset (regcache, &fpregs); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
| 138 | this for all registers (including the floating-point registers). */ |
| 139 | |
| 140 | static void |
| 141 | m68kbsd_store_inferior_registers (struct target_ops *ops, |
| 142 | struct regcache *regcache, int regnum) |
| 143 | { |
| 144 | if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) |
| 145 | { |
| 146 | struct reg regs; |
| 147 | |
| 148 | if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid), |
| 149 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 150 | perror_with_name (_("Couldn't get registers")); |
| 151 | |
| 152 | m68kbsd_collect_gregset (regcache, ®s, regnum); |
| 153 | |
| 154 | if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid), |
| 155 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 156 | perror_with_name (_("Couldn't write registers")); |
| 157 | } |
| 158 | |
| 159 | if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) |
| 160 | { |
| 161 | struct fpreg fpregs; |
| 162 | |
| 163 | if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid), |
| 164 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 165 | perror_with_name (_("Couldn't get floating point status")); |
| 166 | |
| 167 | m68kbsd_collect_fpregset (regcache, &fpregs, regnum); |
| 168 | |
| 169 | if (ptrace (PT_SETFPREGS, ptid_get_pid (inferior_ptid), |
| 170 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 171 | perror_with_name (_("Couldn't write floating point status")); |
| 172 | } |
| 173 | } |
| 174 | \f |
| 175 | |
| 176 | /* Support for debugging kernel virtual memory images. */ |
| 177 | |
| 178 | #include <machine/pcb.h> |
| 179 | |
| 180 | #include "bsd-kvm.h" |
| 181 | |
| 182 | /* OpenBSD doesn't have these. */ |
| 183 | #ifndef PCB_REGS_FP |
| 184 | #define PCB_REGS_FP 10 |
| 185 | #endif |
| 186 | #ifndef PCB_REGS_SP |
| 187 | #define PCB_REGS_SP 11 |
| 188 | #endif |
| 189 | |
| 190 | static int |
| 191 | m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) |
| 192 | { |
| 193 | int regnum, tmp; |
| 194 | int i = 0; |
| 195 | |
| 196 | /* The following is true for NetBSD 1.6.2: |
| 197 | |
| 198 | The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for |
| 199 | all callee-saved registers. From this information we reconstruct |
| 200 | the register state as it would look when we just returned from |
| 201 | cpu_switch(). */ |
| 202 | |
| 203 | /* The stack pointer shouldn't be zero. */ |
| 204 | if (pcb->pcb_regs[PCB_REGS_SP] == 0) |
| 205 | return 0; |
| 206 | |
| 207 | for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++) |
| 208 | regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]); |
| 209 | for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++) |
| 210 | regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]); |
| 211 | |
| 212 | tmp = pcb->pcb_ps & 0xffff; |
| 213 | regcache_raw_supply (regcache, M68K_PS_REGNUM, &tmp); |
| 214 | |
| 215 | read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (char *) &tmp, sizeof tmp); |
| 216 | regcache_raw_supply (regcache, M68K_PC_REGNUM, &tmp); |
| 217 | |
| 218 | return 1; |
| 219 | } |
| 220 | \f |
| 221 | |
| 222 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 223 | void _initialize_m68kbsd_nat (void); |
| 224 | |
| 225 | void |
| 226 | _initialize_m68kbsd_nat (void) |
| 227 | { |
| 228 | struct target_ops *t; |
| 229 | |
| 230 | t = inf_ptrace_target (); |
| 231 | t->to_fetch_registers = m68kbsd_fetch_inferior_registers; |
| 232 | t->to_store_registers = m68kbsd_store_inferior_registers; |
| 233 | add_target (t); |
| 234 | |
| 235 | /* Support debugging kernel virtual memory images. */ |
| 236 | bsd_kvm_add_target (m68kbsd_supply_pcb); |
| 237 | } |