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- /* Native-dependent code for Motorola 68000 BSD's.
- Copyright (C) 2004-2022 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/>. */
- /* We define this to get types like register_t. */
- #define _KERNTYPES
- #include "defs.h"
- #include "gdbcore.h"
- #include "inferior.h"
- #include "regcache.h"
- #include <sys/types.h>
- #include <sys/ptrace.h>
- #include <machine/reg.h>
- #include "m68k-tdep.h"
- #include "inf-ptrace.h"
- #include "netbsd-nat.h"
- struct m68k_bsd_nat_target final : public nbsd_nat_target
- {
- void fetch_registers (struct regcache *, int) override;
- void store_registers (struct regcache *, int) override;
- };
- static m68k_bsd_nat_target the_m68k_bsd_nat_target;
- static int
- m68kbsd_gregset_supplies_p (int regnum)
- {
- return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM);
- }
- static int
- m68kbsd_fpregset_supplies_p (int regnum)
- {
- return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM);
- }
- /* Supply the general-purpose registers stored in GREGS to REGCACHE. */
- static void
- m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs)
- {
- const gdb_byte *regs = (const gdb_byte *) gregs;
- int regnum;
- for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++)
- regcache->raw_supply (regnum, regs + regnum * 4);
- }
- /* Supply the floating-point registers stored in FPREGS to REGCACHE. */
- static void
- m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- const gdb_byte *regs = (const gdb_byte *) fpregs;
- int regnum;
- for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++)
- regcache->raw_supply (regnum,
- regs + m68kbsd_fpreg_offset (gdbarch, regnum));
- }
- /* Collect the general-purpose registers from REGCACHE and store them
- in GREGS. */
- static void
- m68kbsd_collect_gregset (const struct regcache *regcache,
- void *gregs, int regnum)
- {
- gdb_byte *regs = (gdb_byte *) gregs;
- int i;
- for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
- {
- if (regnum == -1 || regnum == i)
- regcache->raw_collect (i, regs + i * 4);
- }
- }
- /* Collect the floating-point registers from REGCACHE and store them
- in FPREGS. */
- static void
- m68kbsd_collect_fpregset (struct regcache *regcache,
- void *fpregs, int regnum)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- char *regs = fpregs;
- int i;
- for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++)
- {
- if (regnum == -1 || regnum == i)
- regcache->raw_collect (i, regs + m68kbsd_fpreg_offset (gdbarch, i));
- }
- }
- /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
- for all registers (including the floating-point registers). */
- void
- m68k_bsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
- {
- pid_t pid = regcache->ptid ().pid ();
- int lwp = regcache->ptid ().lwp ();
- if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
- {
- struct reg regs;
- if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1)
- perror_with_name (_("Couldn't get registers"));
- m68kbsd_supply_gregset (regcache, ®s);
- }
- if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
- {
- struct fpreg fpregs;
- if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
- perror_with_name (_("Couldn't get floating point status"));
- m68kbsd_supply_fpregset (regcache, &fpregs);
- }
- }
- /* Store register REGNUM back into the inferior. If REGNUM is -1, do
- this for all registers (including the floating-point registers). */
- void
- m68k_bsd_nat_target::store_registers (struct regcache *regcache, int regnum)
- {
- pid_t pid = regcache->ptid ().pid ();
- int lwp = regcache->ptid ().lwp ();
- if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
- {
- struct reg regs;
- if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1)
- perror_with_name (_("Couldn't get registers"));
- m68kbsd_collect_gregset (regcache, ®s, regnum);
- if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1)
- perror_with_name (_("Couldn't write registers"));
- }
- if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
- {
- struct fpreg fpregs;
- if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
- perror_with_name (_("Couldn't get floating point status"));
- m68kbsd_collect_fpregset (regcache, &fpregs, regnum);
- if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
- perror_with_name (_("Couldn't write floating point status"));
- }
- }
- /* Support for debugging kernel virtual memory images. */
- #include <machine/pcb.h>
- #include "bsd-kvm.h"
- /* OpenBSD doesn't have these. */
- #ifndef PCB_REGS_FP
- #define PCB_REGS_FP 10
- #endif
- #ifndef PCB_REGS_SP
- #define PCB_REGS_SP 11
- #endif
- static int
- m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
- {
- int regnum, tmp;
- int i = 0;
- /* The following is true for NetBSD 1.6.2:
- The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for
- all callee-saved registers. From this information we reconstruct
- the register state as it would look when we just returned from
- cpu_switch(). */
- /* The stack pointer shouldn't be zero. */
- if (pcb->pcb_regs[PCB_REGS_SP] == 0)
- return 0;
- for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++)
- regcache->raw_supply (regnum, &pcb->pcb_regs[i++]);
- for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++)
- regcache->raw_supply (regnum, &pcb->pcb_regs[i++]);
- tmp = pcb->pcb_ps & 0xffff;
- regcache->raw_supply (M68K_PS_REGNUM, &tmp);
- read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (gdb_byte *) &tmp, sizeof tmp);
- regcache->raw_supply (M68K_PC_REGNUM, &tmp);
- return 1;
- }
- void _initialize_m68kbsd_nat ();
- void
- _initialize_m68kbsd_nat ()
- {
- add_inf_child_target (&the_m68k_bsd_nat_target);
- /* Support debugging kernel virtual memory images. */
- bsd_kvm_add_target (m68kbsd_supply_pcb);
- }
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