| /* Native-dependent code for NetBSD/powerpc. |
| |
| Copyright (C) 2002-2021 Free Software Foundation, Inc. |
| |
| Contributed by Wasabi Systems, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| /* We define this to get types like register_t. */ |
| #define _KERNTYPES |
| #include "defs.h" |
| |
| #include <sys/types.h> |
| #include <sys/ptrace.h> |
| #include <machine/reg.h> |
| #include <machine/frame.h> |
| #include <machine/pcb.h> |
| |
| #include "gdbcore.h" |
| #include "inferior.h" |
| #include "regcache.h" |
| |
| #include "ppc-tdep.h" |
| #include "ppc-netbsd-tdep.h" |
| #include "bsd-kvm.h" |
| #include "inf-ptrace.h" |
| #include "netbsd-nat.h" |
| |
| struct ppc_nbsd_nat_target final : public nbsd_nat_target |
| { |
| void fetch_registers (struct regcache *, int) override; |
| void store_registers (struct regcache *, int) override; |
| }; |
| |
| static ppc_nbsd_nat_target the_ppc_nbsd_nat_target; |
| |
| /* Returns true if PT_GETREGS fetches this register. */ |
| |
| static int |
| getregs_supplies (struct gdbarch *gdbarch, int regnum) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| return ((regnum >= tdep->ppc_gp0_regnum |
| && regnum < tdep->ppc_gp0_regnum + ppc_num_gprs) |
| || regnum == tdep->ppc_lr_regnum |
| || regnum == tdep->ppc_cr_regnum |
| || regnum == tdep->ppc_xer_regnum |
| || regnum == tdep->ppc_ctr_regnum |
| || regnum == gdbarch_pc_regnum (gdbarch)); |
| } |
| |
| /* Like above, but for PT_GETFPREGS. */ |
| |
| static int |
| getfpregs_supplies (struct gdbarch *gdbarch, int regnum) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| point registers. Traditionally, GDB's register set has still |
| listed the floating point registers for such machines, so this |
| code is harmless. However, the new E500 port actually omits the |
| floating point registers entirely from the register set --- they |
| don't even have register numbers assigned to them. |
| |
| It's not clear to me how best to update this code, so this assert |
| will alert the first person to encounter the NetBSD/E500 |
| combination to the problem. */ |
| gdb_assert (ppc_floating_point_unit_p (gdbarch)); |
| |
| return ((regnum >= tdep->ppc_fp0_regnum |
| && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs) |
| || regnum == tdep->ppc_fpscr_regnum); |
| } |
| |
| void |
| ppc_nbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum) |
| { |
| struct gdbarch *gdbarch = regcache->arch (); |
| pid_t pid = regcache->ptid ().pid (); |
| int lwp = regcache->ptid ().lwp (); |
| |
| if (regnum == -1 || getregs_supplies (gdbarch, regnum)) |
| { |
| struct reg regs; |
| |
| if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) |
| perror_with_name (_("Couldn't get registers")); |
| |
| ppc_supply_gregset (&ppcnbsd_gregset, regcache, |
| regnum, ®s, sizeof regs); |
| } |
| |
| if (regnum == -1 || getfpregs_supplies (gdbarch, regnum)) |
| { |
| struct fpreg fpregs; |
| |
| if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) |
| perror_with_name (_("Couldn't get FP registers")); |
| |
| ppc_supply_fpregset (&ppcnbsd_fpregset, regcache, |
| regnum, &fpregs, sizeof fpregs); |
| } |
| } |
| |
| void |
| ppc_nbsd_nat_target::store_registers (struct regcache *regcache, int regnum) |
| { |
| struct gdbarch *gdbarch = regcache->arch (); |
| pid_t pid = regcache->ptid ().pid (); |
| int lwp = regcache->ptid ().lwp (); |
| |
| if (regnum == -1 || getregs_supplies (gdbarch, regnum)) |
| { |
| struct reg regs; |
| |
| if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) |
| perror_with_name (_("Couldn't get registers")); |
| |
| ppc_collect_gregset (&ppcnbsd_gregset, regcache, |
| regnum, ®s, sizeof regs); |
| |
| if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) |
| perror_with_name (_("Couldn't write registers")); |
| } |
| |
| if (regnum == -1 || getfpregs_supplies (gdbarch, regnum)) |
| { |
| struct fpreg fpregs; |
| |
| if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) |
| perror_with_name (_("Couldn't get FP registers")); |
| |
| ppc_collect_fpregset (&ppcnbsd_fpregset, regcache, |
| regnum, &fpregs, sizeof fpregs); |
| |
| if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) |
| perror_with_name (_("Couldn't set FP registers")); |
| } |
| } |
| |
| static int |
| ppcnbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) |
| { |
| struct switchframe sf; |
| struct callframe cf; |
| struct gdbarch *gdbarch = regcache->arch (); |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| int i; |
| |
| /* The stack pointer shouldn't be zero. */ |
| if (pcb->pcb_sp == 0) |
| return 0; |
| |
| read_memory (pcb->pcb_sp, (gdb_byte *)&sf, sizeof sf); |
| regcache->raw_supply (tdep->ppc_cr_regnum, &sf.cr); |
| regcache->raw_supply (tdep->ppc_gp0_regnum + 2, &sf.fixreg2); |
| for (i = 0 ; i < 19 ; i++) |
| regcache->raw_supply (tdep->ppc_gp0_regnum + 13 + i, &sf.fixreg[i]); |
| |
| read_memory(sf.sp, (gdb_byte *)&cf, sizeof(cf)); |
| regcache->raw_supply (tdep->ppc_gp0_regnum + 30, &cf.r30); |
| regcache->raw_supply (tdep->ppc_gp0_regnum + 31, &cf.r31); |
| regcache->raw_supply (tdep->ppc_gp0_regnum + 1, &cf.sp); |
| |
| read_memory(cf.sp, (gdb_byte *)&cf, sizeof(cf)); |
| regcache->raw_supply (tdep->ppc_lr_regnum, &cf.lr); |
| regcache->raw_supply (gdbarch_pc_regnum (gdbarch), &cf.lr); |
| |
| return 1; |
| } |
| |
| void _initialize_ppcnbsd_nat (); |
| void |
| _initialize_ppcnbsd_nat () |
| { |
| /* Support debugging kernel virtual memory images. */ |
| bsd_kvm_add_target (ppcnbsd_supply_pcb); |
| |
| add_inf_child_target (&the_ppc_nbsd_nat_target); |
| } |