| 1 | /* Native-dependent code for NetBSD/powerpc. |
| 2 | |
| 3 | Copyright (C) 2002-2020 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Wasabi Systems, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | /* We define this to get types like register_t. */ |
| 23 | #define _KERNTYPES |
| 24 | #include "defs.h" |
| 25 | |
| 26 | #include <sys/types.h> |
| 27 | #include <sys/ptrace.h> |
| 28 | #include <machine/reg.h> |
| 29 | #include <machine/frame.h> |
| 30 | #include <machine/pcb.h> |
| 31 | |
| 32 | #include "gdbcore.h" |
| 33 | #include "inferior.h" |
| 34 | #include "regcache.h" |
| 35 | |
| 36 | #include "ppc-tdep.h" |
| 37 | #include "ppc-nbsd-tdep.h" |
| 38 | #include "bsd-kvm.h" |
| 39 | #include "inf-ptrace.h" |
| 40 | |
| 41 | struct ppc_nbsd_nat_target final : public inf_ptrace_target |
| 42 | { |
| 43 | void fetch_registers (struct regcache *, int) override; |
| 44 | void store_registers (struct regcache *, int) override; |
| 45 | }; |
| 46 | |
| 47 | static ppc_nbsd_nat_target the_ppc_nbsd_nat_target; |
| 48 | |
| 49 | /* Returns true if PT_GETREGS fetches this register. */ |
| 50 | |
| 51 | static int |
| 52 | getregs_supplies (struct gdbarch *gdbarch, int regnum) |
| 53 | { |
| 54 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 55 | |
| 56 | return ((regnum >= tdep->ppc_gp0_regnum |
| 57 | && regnum < tdep->ppc_gp0_regnum + ppc_num_gprs) |
| 58 | || regnum == tdep->ppc_lr_regnum |
| 59 | || regnum == tdep->ppc_cr_regnum |
| 60 | || regnum == tdep->ppc_xer_regnum |
| 61 | || regnum == tdep->ppc_ctr_regnum |
| 62 | || regnum == gdbarch_pc_regnum (gdbarch)); |
| 63 | } |
| 64 | |
| 65 | /* Like above, but for PT_GETFPREGS. */ |
| 66 | |
| 67 | static int |
| 68 | getfpregs_supplies (struct gdbarch *gdbarch, int regnum) |
| 69 | { |
| 70 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 71 | |
| 72 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| 73 | point registers. Traditionally, GDB's register set has still |
| 74 | listed the floating point registers for such machines, so this |
| 75 | code is harmless. However, the new E500 port actually omits the |
| 76 | floating point registers entirely from the register set --- they |
| 77 | don't even have register numbers assigned to them. |
| 78 | |
| 79 | It's not clear to me how best to update this code, so this assert |
| 80 | will alert the first person to encounter the NetBSD/E500 |
| 81 | combination to the problem. */ |
| 82 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); |
| 83 | |
| 84 | return ((regnum >= tdep->ppc_fp0_regnum |
| 85 | && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs) |
| 86 | || regnum == tdep->ppc_fpscr_regnum); |
| 87 | } |
| 88 | |
| 89 | void |
| 90 | ppc_nbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum) |
| 91 | { |
| 92 | struct gdbarch *gdbarch = regcache->arch (); |
| 93 | pid_t pid = regcache->ptid ().pid (); |
| 94 | |
| 95 | if (regnum == -1 || getregs_supplies (gdbarch, regnum)) |
| 96 | { |
| 97 | struct reg regs; |
| 98 | |
| 99 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 100 | perror_with_name (_("Couldn't get registers")); |
| 101 | |
| 102 | ppc_supply_gregset (&ppcnbsd_gregset, regcache, |
| 103 | regnum, ®s, sizeof regs); |
| 104 | } |
| 105 | |
| 106 | if (regnum == -1 || getfpregs_supplies (gdbarch, regnum)) |
| 107 | { |
| 108 | struct fpreg fpregs; |
| 109 | |
| 110 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 111 | perror_with_name (_("Couldn't get FP registers")); |
| 112 | |
| 113 | ppc_supply_fpregset (&ppcnbsd_fpregset, regcache, |
| 114 | regnum, &fpregs, sizeof fpregs); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | void |
| 119 | ppc_nbsd_nat_target::store_registers (struct regcache *regcache, int regnum) |
| 120 | { |
| 121 | struct gdbarch *gdbarch = regcache->arch (); |
| 122 | pid_t pid = regcache->ptid ().pid (); |
| 123 | |
| 124 | if (regnum == -1 || getregs_supplies (gdbarch, regnum)) |
| 125 | { |
| 126 | struct reg regs; |
| 127 | |
| 128 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 129 | perror_with_name (_("Couldn't get registers")); |
| 130 | |
| 131 | ppc_collect_gregset (&ppcnbsd_gregset, regcache, |
| 132 | regnum, ®s, sizeof regs); |
| 133 | |
| 134 | if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 135 | perror_with_name (_("Couldn't write registers")); |
| 136 | } |
| 137 | |
| 138 | if (regnum == -1 || getfpregs_supplies (gdbarch, regnum)) |
| 139 | { |
| 140 | struct fpreg fpregs; |
| 141 | |
| 142 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 143 | perror_with_name (_("Couldn't get FP registers")); |
| 144 | |
| 145 | ppc_collect_fpregset (&ppcnbsd_fpregset, regcache, |
| 146 | regnum, &fpregs, sizeof fpregs); |
| 147 | |
| 148 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 149 | perror_with_name (_("Couldn't set FP registers")); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | static int |
| 154 | ppcnbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) |
| 155 | { |
| 156 | struct switchframe sf; |
| 157 | struct callframe cf; |
| 158 | struct gdbarch *gdbarch = regcache->arch (); |
| 159 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 160 | int i; |
| 161 | |
| 162 | /* The stack pointer shouldn't be zero. */ |
| 163 | if (pcb->pcb_sp == 0) |
| 164 | return 0; |
| 165 | |
| 166 | read_memory (pcb->pcb_sp, (gdb_byte *)&sf, sizeof sf); |
| 167 | regcache->raw_supply (tdep->ppc_cr_regnum, &sf.cr); |
| 168 | regcache->raw_supply (tdep->ppc_gp0_regnum + 2, &sf.fixreg2); |
| 169 | for (i = 0 ; i < 19 ; i++) |
| 170 | regcache->raw_supply (tdep->ppc_gp0_regnum + 13 + i, &sf.fixreg[i]); |
| 171 | |
| 172 | read_memory(sf.sp, (gdb_byte *)&cf, sizeof(cf)); |
| 173 | regcache->raw_supply (tdep->ppc_gp0_regnum + 30, &cf.r30); |
| 174 | regcache->raw_supply (tdep->ppc_gp0_regnum + 31, &cf.r31); |
| 175 | regcache->raw_supply (tdep->ppc_gp0_regnum + 1, &cf.sp); |
| 176 | |
| 177 | read_memory(cf.sp, (gdb_byte *)&cf, sizeof(cf)); |
| 178 | regcache->raw_supply (tdep->ppc_lr_regnum, &cf.lr); |
| 179 | regcache->raw_supply (gdbarch_pc_regnum (gdbarch), &cf.lr); |
| 180 | |
| 181 | return 1; |
| 182 | } |
| 183 | |
| 184 | void _initialize_ppcnbsd_nat (); |
| 185 | void |
| 186 | _initialize_ppcnbsd_nat () |
| 187 | { |
| 188 | /* Support debugging kernel virtual memory images. */ |
| 189 | bsd_kvm_add_target (ppcnbsd_supply_pcb); |
| 190 | |
| 191 | add_inf_child_target (&the_ppc_nbsd_nat_target); |
| 192 | } |