| 1 | /* Native-dependent code for PowerPC's running FreeBSD, for GDB. |
| 2 | |
| 3 | Copyright (C) 2013-2020 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 "gdbcore.h" |
| 22 | #include "inferior.h" |
| 23 | #include "regcache.h" |
| 24 | |
| 25 | #include <sys/types.h> |
| 26 | #include <sys/procfs.h> |
| 27 | #include <sys/ptrace.h> |
| 28 | #include <sys/signal.h> |
| 29 | #include <machine/frame.h> |
| 30 | #include <machine/pcb.h> |
| 31 | #include <machine/reg.h> |
| 32 | |
| 33 | #include "fbsd-nat.h" |
| 34 | #include "gregset.h" |
| 35 | #include "ppc-tdep.h" |
| 36 | #include "ppc-fbsd-tdep.h" |
| 37 | #include "inf-ptrace.h" |
| 38 | #include "bsd-kvm.h" |
| 39 | |
| 40 | struct ppc_fbsd_nat_target final : public fbsd_nat_target |
| 41 | { |
| 42 | void fetch_registers (struct regcache *, int) override; |
| 43 | void store_registers (struct regcache *, int) override; |
| 44 | }; |
| 45 | |
| 46 | static ppc_fbsd_nat_target the_ppc_fbsd_nat_target; |
| 47 | |
| 48 | /* Fill GDB's register array with the general-purpose register values |
| 49 | in *GREGSETP. */ |
| 50 | |
| 51 | void |
| 52 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) |
| 53 | { |
| 54 | const struct regset *regset = ppc_fbsd_gregset (sizeof (long)); |
| 55 | |
| 56 | ppc_supply_gregset (regset, regcache, -1, gregsetp, sizeof (*gregsetp)); |
| 57 | } |
| 58 | |
| 59 | /* Fill register REGNO (if a gpr) in *GREGSETP with the value in GDB's |
| 60 | register array. If REGNO is -1 do it for all registers. */ |
| 61 | |
| 62 | void |
| 63 | fill_gregset (const struct regcache *regcache, |
| 64 | gdb_gregset_t *gregsetp, int regno) |
| 65 | { |
| 66 | const struct regset *regset = ppc_fbsd_gregset (sizeof (long)); |
| 67 | |
| 68 | if (regno == -1) |
| 69 | memset (gregsetp, 0, sizeof (*gregsetp)); |
| 70 | ppc_collect_gregset (regset, regcache, regno, gregsetp, sizeof (*gregsetp)); |
| 71 | } |
| 72 | |
| 73 | /* Fill GDB's register array with the floating-point register values |
| 74 | in *FPREGSETP. */ |
| 75 | |
| 76 | void |
| 77 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t * fpregsetp) |
| 78 | { |
| 79 | const struct regset *regset = ppc_fbsd_fpregset (); |
| 80 | |
| 81 | ppc_supply_fpregset (regset, regcache, -1, |
| 82 | fpregsetp, sizeof (*fpregsetp)); |
| 83 | } |
| 84 | |
| 85 | /* Fill register REGNO in *FGREGSETP with the value in GDB's |
| 86 | register array. If REGNO is -1 do it for all registers. */ |
| 87 | |
| 88 | void |
| 89 | fill_fpregset (const struct regcache *regcache, |
| 90 | gdb_fpregset_t *fpregsetp, int regno) |
| 91 | { |
| 92 | const struct regset *regset = ppc_fbsd_fpregset (); |
| 93 | |
| 94 | ppc_collect_fpregset (regset, regcache, regno, |
| 95 | fpregsetp, sizeof (*fpregsetp)); |
| 96 | } |
| 97 | |
| 98 | /* Returns true if PT_GETFPREGS fetches this register. */ |
| 99 | |
| 100 | static int |
| 101 | getfpregs_supplies (struct gdbarch *gdbarch, int regno) |
| 102 | { |
| 103 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 104 | |
| 105 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| 106 | point registers. Traditionally, GDB's register set has still |
| 107 | listed the floating point registers for such machines, so this |
| 108 | code is harmless. However, the new E500 port actually omits the |
| 109 | floating point registers entirely from the register set --- they |
| 110 | don't even have register numbers assigned to them. |
| 111 | |
| 112 | It's not clear to me how best to update this code, so this assert |
| 113 | will alert the first person to encounter the NetBSD/E500 |
| 114 | combination to the problem. */ |
| 115 | |
| 116 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); |
| 117 | |
| 118 | return ((regno >= tdep->ppc_fp0_regnum |
| 119 | && regno < tdep->ppc_fp0_regnum + ppc_num_fprs) |
| 120 | || regno == tdep->ppc_fpscr_regnum); |
| 121 | } |
| 122 | |
| 123 | /* Fetch register REGNO from the child process. If REGNO is -1, do it |
| 124 | for all registers. */ |
| 125 | |
| 126 | void |
| 127 | ppc_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regno) |
| 128 | { |
| 129 | gdb_gregset_t regs; |
| 130 | pid_t pid = regcache->ptid ().lwp (); |
| 131 | |
| 132 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 133 | perror_with_name (_("Couldn't get registers")); |
| 134 | |
| 135 | supply_gregset (regcache, ®s); |
| 136 | |
| 137 | if (regno == -1 || getfpregs_supplies (regcache->arch (), regno)) |
| 138 | { |
| 139 | const struct regset *fpregset = ppc_fbsd_fpregset (); |
| 140 | gdb_fpregset_t 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_supply_fpregset (fpregset, regcache, regno, &fpregs, sizeof fpregs); |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | /* Store register REGNO back into the child process. If REGNO is -1, |
| 150 | do this for all registers. */ |
| 151 | |
| 152 | void |
| 153 | ppc_fbsd_nat_target::store_registers (struct regcache *regcache, int regno) |
| 154 | { |
| 155 | gdb_gregset_t regs; |
| 156 | pid_t pid = regcache->ptid ().lwp (); |
| 157 | |
| 158 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 159 | perror_with_name (_("Couldn't get registers")); |
| 160 | |
| 161 | fill_gregset (regcache, ®s, regno); |
| 162 | |
| 163 | if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
| 164 | perror_with_name (_("Couldn't write registers")); |
| 165 | |
| 166 | if (regno == -1 || getfpregs_supplies (regcache->arch (), regno)) |
| 167 | { |
| 168 | gdb_fpregset_t fpregs; |
| 169 | |
| 170 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 171 | perror_with_name (_("Couldn't get FP registers")); |
| 172 | |
| 173 | fill_fpregset (regcache, &fpregs, regno); |
| 174 | |
| 175 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
| 176 | perror_with_name (_("Couldn't set FP registers")); |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | /* Architecture specific function that reconstructs the |
| 181 | register state from PCB (Process Control Block) and supplies it |
| 182 | to REGCACHE. */ |
| 183 | |
| 184 | static int |
| 185 | ppcfbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) |
| 186 | { |
| 187 | struct gdbarch *gdbarch = regcache->arch (); |
| 188 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 189 | int i, regnum; |
| 190 | |
| 191 | /* The stack pointer shouldn't be zero. */ |
| 192 | if (pcb->pcb_sp == 0) |
| 193 | return 0; |
| 194 | |
| 195 | regcache->raw_supply (gdbarch_sp_regnum (gdbarch), &pcb->pcb_sp); |
| 196 | regcache->raw_supply (tdep->ppc_cr_regnum, &pcb->pcb_cr); |
| 197 | regcache->raw_supply (tdep->ppc_lr_regnum, &pcb->pcb_lr); |
| 198 | for (i = 0, regnum = tdep->ppc_gp0_regnum + 14; i < 20; i++, regnum++) |
| 199 | regcache->raw_supply (regnum, &pcb->pcb_context[i]); |
| 200 | |
| 201 | return 1; |
| 202 | } |
| 203 | |
| 204 | void |
| 205 | _initialize_ppcfbsd_nat (void) |
| 206 | { |
| 207 | add_inf_child_target (&the_ppc_fbsd_nat_target); |
| 208 | |
| 209 | /* Support debugging kernel virtual memory images. */ |
| 210 | bsd_kvm_add_target (ppcfbsd_supply_pcb); |
| 211 | } |