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/* Native-dependent code for Motorola 68000 BSD's.
Copyright (C) 2004-2024 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/>. */
/* We define this to get types like register_t. */
#define _KERNTYPES
#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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