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- /* Native-dependent code for NetBSD/powerpc.
- Copyright (C) 2002-2022 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)
- {
- ppc_gdbarch_tdep *tdep = (ppc_gdbarch_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)
- {
- ppc_gdbarch_tdep *tdep = (ppc_gdbarch_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 ();
- ppc_gdbarch_tdep *tdep = (ppc_gdbarch_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);
- }
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