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/* Native-dependent code for modern VAX BSD's.
Copyright (C) 2004-2019 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"
/* Standard C includes. */
#include <machine/reg.h>
#include <sys/ptrace.h>
#include <sys/types.h>
/* Local includes. */
#include "inf-ptrace.h"
#include "inferior.h"
#include "regcache.h"
#include "target.h"
#include "vax-tdep.h"
struct vax_bsd_nat_target final : public inf_ptrace_target
{
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
};
static vax_bsd_nat_target the_vax_bsd_nat_target;
/* Supply the general-purpose registers stored in GREGS to REGCACHE. */
static void
vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs)
{
const gdb_byte *regs = gregs;
int regnum;
for (regnum = 0; regnum < VAX_NUM_REGS; regnum++)
regcache->raw_supply (regnum, regs + regnum * 4);
}
/* Collect the general-purpose registers from REGCACHE and store them
in GREGS. */
static void
vaxbsd_collect_gregset (const struct regcache *regcache,
void *gregs, int regnum)
{
gdb_byte *regs = gregs;
int i;
for (i = 0; i <= VAX_NUM_REGS; i++)
{
if (regnum == -1 || regnum == i)
regcache->raw_collect (i, regs + i * 4);
}
}
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
for all registers. */
void
vax_bsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
{
struct reg regs;
pid_t pid = regcache->ptid ().pid ();
if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't get registers"));
vaxbsd_supply_gregset (regcache, ®s);
}
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
this for all registers. */
void
vax_bsd_nat_target::store_registers (struct regcache *regcache, int regnum)
{
struct reg regs;
pid_t pid = regcache->ptid ().pid ();
if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't get registers"));
vaxbsd_collect_gregset (regcache, ®s, regnum);
if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't write registers"));
}
/* Support for debugging kernel virtual memory images. */
#include <machine/pcb.h>
#include "bsd-kvm.h"
static int
vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
int regnum;
/* The following is true for OpenBSD 3.5:
The pcb contains the register state at the context switch inside
cpu_switch(). */
/* The stack pointer shouldn't be zero. */
if (pcb->KSP == 0)
return 0;
for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++)
regcache->raw_supply (regnum, &pcb->R[regnum - VAX_R0_REGNUM]);
regcache->raw_supply (VAX_AP_REGNUM, &pcb->AP);
regcache->raw_supply (VAX_FP_REGNUM, &pcb->FP);
regcache->raw_supply (VAX_SP_REGNUM, &pcb->KSP);
regcache->raw_supply (VAX_PC_REGNUM, &pcb->PC);
regcache->raw_supply (VAX_PS_REGNUM, &pcb->PSL);
return 1;
}
void
_initialize_vaxbsd_nat (void)
{
add_inf_child_target (&the_vax_bsd_nat_target);
/* Support debugging kernel virtual memory images. */
bsd_kvm_add_target (vaxbsd_supply_pcb);
}
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