| /* Native-dependent code for PowerPC's running FreeBSD, for GDB. |
| |
| Copyright (C) 2013-2024 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 "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 = gdbarch_tdep<ppc_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 = gdbarch_tdep<ppc_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); |
| } |