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/* Native-dependent code for NetBSD/powerpc.
Copyright (C) 2002-2017 Free Software Foundation, Inc.
Contributed by Wasabi Systems, 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 <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <machine/frame.h>
#include <machine/pcb.h>
#include "gdbcore.h"
#include "inferior.h"
#include "regcache.h"
#include "ppc-tdep.h"
#include "ppc-nbsd-tdep.h"
#include "bsd-kvm.h"
#include "inf-ptrace.h"
/* Returns true if PT_GETREGS fetches this register. */
static int
getregs_supplies (struct gdbarch *gdbarch, int regnum)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
return ((regnum >= tdep->ppc_gp0_regnum
&& regnum < tdep->ppc_gp0_regnum + ppc_num_gprs)
|| regnum == tdep->ppc_lr_regnum
|| regnum == tdep->ppc_cr_regnum
|| regnum == tdep->ppc_xer_regnum
|| regnum == tdep->ppc_ctr_regnum
|| regnum == gdbarch_pc_regnum (gdbarch));
}
/* Like above, but for PT_GETFPREGS. */
static int
getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
{
struct gdbarch_tdep *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 ((regnum >= tdep->ppc_fp0_regnum
&& regnum < tdep->ppc_fp0_regnum + ppc_num_fprs)
|| regnum == tdep->ppc_fpscr_regnum);
}
static void
ppcnbsd_fetch_inferior_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
if (regnum == -1 || getregs_supplies (gdbarch, regnum))
{
struct reg regs;
if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't get registers"));
ppc_supply_gregset (&ppcnbsd_gregset, regcache,
regnum, ®s, sizeof regs);
}
if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
{
struct fpreg fpregs;
if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
perror_with_name (_("Couldn't get FP registers"));
ppc_supply_fpregset (&ppcnbsd_fpregset, regcache,
regnum, &fpregs, sizeof fpregs);
}
}
static void
ppcnbsd_store_inferior_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
if (regnum == -1 || getregs_supplies (gdbarch, regnum))
{
struct reg regs;
if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't get registers"));
ppc_collect_gregset (&ppcnbsd_gregset, regcache,
regnum, ®s, sizeof regs);
if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't write registers"));
}
if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
{
struct fpreg fpregs;
if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
perror_with_name (_("Couldn't get FP registers"));
ppc_collect_fpregset (&ppcnbsd_fpregset, regcache,
regnum, &fpregs, sizeof fpregs);
if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
perror_with_name (_("Couldn't set FP registers"));
}
}
static int
ppcnbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
struct switchframe sf;
struct callframe cf;
struct gdbarch *gdbarch = get_regcache_arch (regcache);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
int i;
/* The stack pointer shouldn't be zero. */
if (pcb->pcb_sp == 0)
return 0;
read_memory (pcb->pcb_sp, (gdb_byte *)&sf, sizeof sf);
regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &sf.cr);
regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 2, &sf.fixreg2);
for (i = 0 ; i < 19 ; i++)
regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 13 + i,
&sf.fixreg[i]);
read_memory(sf.sp, (gdb_byte *)&cf, sizeof(cf));
regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 30, &cf.r30);
regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 31, &cf.r31);
regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 1, &cf.sp);
read_memory(cf.sp, (gdb_byte *)&cf, sizeof(cf));
regcache_raw_supply (regcache, tdep->ppc_lr_regnum, &cf.lr);
regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &cf.lr);
return 1;
}
void
_initialize_ppcnbsd_nat (void)
{
struct target_ops *t;
/* Support debugging kernel virtual memory images. */
bsd_kvm_add_target (ppcnbsd_supply_pcb);
/* Add in local overrides. */
t = inf_ptrace_target ();
t->to_fetch_registers = ppcnbsd_fetch_inferior_registers;
t->to_store_registers = ppcnbsd_store_inferior_registers;
add_target (t);
}
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