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- /* Native-dependent code for PowerPC's running FreeBSD, for GDB.
- Copyright (C) 2013-2022 Free Software Foundation, 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/>. */
- #include "defs.h"
- #include "gdbcore.h"
- #include "inferior.h"
- #include "regcache.h"
- #include <sys/types.h>
- #include <sys/procfs.h>
- #include <sys/ptrace.h>
- #include <sys/signal.h>
- #include <machine/frame.h>
- #include <machine/pcb.h>
- #include <machine/reg.h>
- #include "fbsd-nat.h"
- #include "gregset.h"
- #include "ppc-tdep.h"
- #include "ppc-fbsd-tdep.h"
- #include "inf-ptrace.h"
- #include "bsd-kvm.h"
- struct ppc_fbsd_nat_target final : public fbsd_nat_target
- {
- void fetch_registers (struct regcache *, int) override;
- void store_registers (struct regcache *, int) override;
- };
- static ppc_fbsd_nat_target the_ppc_fbsd_nat_target;
- /* Fill GDB's register array with the general-purpose register values
- in *GREGSETP. */
- void
- supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
- {
- const struct regset *regset = ppc_fbsd_gregset (sizeof (long));
- ppc_supply_gregset (regset, regcache, -1, gregsetp, sizeof (*gregsetp));
- }
- /* Fill register REGNO (if a gpr) in *GREGSETP with the value in GDB's
- register array. If REGNO is -1 do it for all registers. */
- void
- fill_gregset (const struct regcache *regcache,
- gdb_gregset_t *gregsetp, int regno)
- {
- const struct regset *regset = ppc_fbsd_gregset (sizeof (long));
- if (regno == -1)
- memset (gregsetp, 0, sizeof (*gregsetp));
- ppc_collect_gregset (regset, regcache, regno, gregsetp, sizeof (*gregsetp));
- }
- /* Fill GDB's register array with the floating-point register values
- in *FPREGSETP. */
- void
- supply_fpregset (struct regcache *regcache, const gdb_fpregset_t * fpregsetp)
- {
- const struct regset *regset = ppc_fbsd_fpregset ();
- ppc_supply_fpregset (regset, regcache, -1,
- fpregsetp, sizeof (*fpregsetp));
- }
- /* Fill register REGNO in *FGREGSETP with the value in GDB's
- register array. If REGNO is -1 do it for all registers. */
- void
- fill_fpregset (const struct regcache *regcache,
- gdb_fpregset_t *fpregsetp, int regno)
- {
- const struct regset *regset = ppc_fbsd_fpregset ();
- ppc_collect_fpregset (regset, regcache, regno,
- fpregsetp, sizeof (*fpregsetp));
- }
- /* Returns true if PT_GETFPREGS fetches this register. */
- static int
- getfpregs_supplies (struct gdbarch *gdbarch, int regno)
- {
- 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 ((regno >= tdep->ppc_fp0_regnum
- && regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
- || regno == tdep->ppc_fpscr_regnum);
- }
- /* Fetch register REGNO from the child process. If REGNO is -1, do it
- for all registers. */
- void
- ppc_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
- {
- gdb_gregset_t regs;
- pid_t pid = regcache->ptid ().lwp ();
- if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
- perror_with_name (_("Couldn't get registers"));
- supply_gregset (regcache, ®s);
- if (regno == -1 || getfpregs_supplies (regcache->arch (), regno))
- {
- const struct regset *fpregset = ppc_fbsd_fpregset ();
- gdb_fpregset_t fpregs;
- if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
- perror_with_name (_("Couldn't get FP registers"));
- ppc_supply_fpregset (fpregset, regcache, regno, &fpregs, sizeof fpregs);
- }
- }
- /* Store register REGNO back into the child process. If REGNO is -1,
- do this for all registers. */
- void
- ppc_fbsd_nat_target::store_registers (struct regcache *regcache, int regno)
- {
- gdb_gregset_t regs;
- pid_t pid = regcache->ptid ().lwp ();
- if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
- perror_with_name (_("Couldn't get registers"));
- fill_gregset (regcache, ®s, regno);
- if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
- perror_with_name (_("Couldn't write registers"));
- if (regno == -1 || getfpregs_supplies (regcache->arch (), regno))
- {
- gdb_fpregset_t fpregs;
- if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
- perror_with_name (_("Couldn't get FP registers"));
- fill_fpregset (regcache, &fpregs, regno);
- if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
- perror_with_name (_("Couldn't set FP registers"));
- }
- }
- /* Architecture specific function that reconstructs the
- register state from PCB (Process Control Block) and supplies it
- to REGCACHE. */
- static int
- ppcfbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- int i, regnum;
- /* The stack pointer shouldn't be zero. */
- if (pcb->pcb_sp == 0)
- return 0;
- regcache->raw_supply (gdbarch_sp_regnum (gdbarch), &pcb->pcb_sp);
- regcache->raw_supply (tdep->ppc_cr_regnum, &pcb->pcb_cr);
- regcache->raw_supply (tdep->ppc_lr_regnum, &pcb->pcb_lr);
- for (i = 0, regnum = tdep->ppc_gp0_regnum + 14; i < 20; i++, regnum++)
- regcache->raw_supply (regnum, &pcb->pcb_context[i]);
- return 1;
- }
- void _initialize_ppcfbsd_nat ();
- void
- _initialize_ppcfbsd_nat ()
- {
- add_inf_child_target (&the_ppc_fbsd_nat_target);
- /* Support debugging kernel virtual memory images. */
- bsd_kvm_add_target (ppcfbsd_supply_pcb);
- }
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