220 lines
7.1 KiB
C
220 lines
7.1 KiB
C
|
/* Native-dependent code for OpenBSD/powerpc.
|
|||
|
|
|
|||
|
|
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/>. */
|
|||
|
|
|
|||
|
|
#include "defs.h"
|
|||
|
|
#include "gdbcore.h"
|
|||
|
|
#include "inferior.h"
|
|||
|
|
#include "regcache.h"
|
|||
|
|
|
|||
|
|
#include <sys/types.h>
|
|||
|
|
#include <sys/ptrace.h>
|
|||
|
|
#include <sys/signal.h>
|
|||
|
|
#include <machine/frame.h>
|
|||
|
|
#include <machine/pcb.h>
|
|||
|
|
#include <machine/reg.h>
|
|||
|
|
|
|||
|
|
#include "ppc-tdep.h"
|
|||
|
|
#include "ppc-obsd-tdep.h"
|
|||
|
|
#include "inf-ptrace.h"
|
|||
|
|
#include "obsd-nat.h"
|
|||
|
|
#include "bsd-kvm.h"
|
|||
|
|
|
|||
|
|
struct ppc_obsd_nat_target final : public obsd_nat_target
|
|||
|
|
{
|
|||
|
|
void fetch_registers (struct regcache *, int) override;
|
|||
|
|
void store_registers (struct regcache *, int) override;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
static ppc_obsd_nat_target the_ppc_obsd_nat_target;
|
|||
|
|
|
|||
|
|
/* OpenBSD/powerpc didn't have PT_GETFPREGS/PT_SETFPREGS until release
|
|||
|
|
4.0. On older releases the floating-point registers are handled by
|
|||
|
|
PT_GETREGS/PT_SETREGS, but fpscr wasn't available.. */
|
|||
|
|
|
|||
|
|
#ifdef PT_GETFPREGS
|
|||
|
|
|
|||
|
|
/* Returns true if PT_GETFPREGS fetches this register. */
|
|||
|
|
|
|||
|
|
static int
|
|||
|
|
getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
|
|||
|
|
{
|
|||
|
|
ppc_gdbarch_tdep *tdep = (ppc_gdbarch_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);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#endif /* PT_GETFPREGS */
|
|||
|
|
|
|||
|
|
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
|
|||
|
|
for all registers. */
|
|||
|
|
|
|||
|
|
void
|
|||
|
|
ppc_obsd_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"));
|
|||
|
|
|
|||
|
|
ppc_supply_gregset (&ppcobsd_gregset, regcache, -1,
|
|||
|
|
®s, sizeof regs);
|
|||
|
|
#ifndef PT_GETFPREGS
|
|||
|
|
ppc_supply_fpregset (&ppcobsd_gregset, regcache, -1,
|
|||
|
|
®s, sizeof regs);
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
#ifdef PT_GETFPREGS
|
|||
|
|
if (regnum == -1
|
|||
|
|
|| getfpregs_supplies (regcache->arch (), regnum))
|
|||
|
|
{
|
|||
|
|
struct fpreg fpregs;
|
|||
|
|
|
|||
|
|
if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
|
|||
|
|
perror_with_name (_("Couldn't get floating point status"));
|
|||
|
|
|
|||
|
|
ppc_supply_fpregset (&ppcobsd_fpregset, regcache, -1,
|
|||
|
|
&fpregs, sizeof fpregs);
|
|||
|
|
}
|
|||
|
|
#endif
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
|
|||
|
|
this for all registers. */
|
|||
|
|
|
|||
|
|
void
|
|||
|
|
ppc_obsd_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"));
|
|||
|
|
|
|||
|
|
ppc_collect_gregset (&ppcobsd_gregset, regcache,
|
|||
|
|
regnum, ®s, sizeof regs);
|
|||
|
|
#ifndef PT_GETFPREGS
|
|||
|
|
ppc_collect_fpregset (&ppcobsd_gregset, regcache,
|
|||
|
|
regnum, ®s, sizeof regs);
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
|
|||
|
|
perror_with_name (_("Couldn't write registers"));
|
|||
|
|
|
|||
|
|
#ifdef PT_GETFPREGS
|
|||
|
|
if (regnum == -1
|
|||
|
|
|| getfpregs_supplies (regcache->arch (), regnum))
|
|||
|
|
{
|
|||
|
|
struct fpreg fpregs;
|
|||
|
|
|
|||
|
|
if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
|
|||
|
|
perror_with_name (_("Couldn't get floating point status"));
|
|||
|
|
|
|||
|
|
ppc_collect_fpregset (&ppcobsd_fpregset, regcache,
|
|||
|
|
regnum, &fpregs, sizeof fpregs);
|
|||
|
|
|
|||
|
|
if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
|
|||
|
|
perror_with_name (_("Couldn't write floating point status"));
|
|||
|
|
}
|
|||
|
|
#endif
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
static int
|
|||
|
|
ppcobsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
|
|||
|
|
{
|
|||
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|||
|
|
ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch);
|
|||
|
|
struct switchframe sf;
|
|||
|
|
struct callframe cf;
|
|||
|
|
int i, regnum;
|
|||
|
|
|
|||
|
|
/* The following is true for OpenBSD 3.7:
|
|||
|
|
|
|||
|
|
The pcb contains %r1 (the stack pointer) at the point of the
|
|||
|
|
context switch in cpu_switch(). At that point we have a stack
|
|||
|
|
frame as described by `struct switchframe', and below that a call
|
|||
|
|
frame as described by `struct callframe'. From this information
|
|||
|
|
we reconstruct the register state as it would look when we are in
|
|||
|
|
cpu_switch(). */
|
|||
|
|
|
|||
|
|
/* 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 (gdbarch_sp_regnum (gdbarch), &sf.sp);
|
|||
|
|
regcache->raw_supply (tdep->ppc_cr_regnum, &sf.cr);
|
|||
|
|
regcache->raw_supply (tdep->ppc_gp0_regnum + 2, &sf.fixreg2);
|
|||
|
|
for (i = 0, regnum = tdep->ppc_gp0_regnum + 13; i < 19; i++, regnum++)
|
|||
|
|
regcache->raw_supply (regnum, &sf.fixreg[i]);
|
|||
|
|
|
|||
|
|
read_memory (sf.sp, (gdb_byte *)&cf, sizeof cf);
|
|||
|
|
regcache->raw_supply (gdbarch_pc_regnum (gdbarch), &cf.lr);
|
|||
|
|
regcache->raw_supply (tdep->ppc_gp0_regnum + 30, &cf.r30);
|
|||
|
|
regcache->raw_supply (tdep->ppc_gp0_regnum + 31, &cf.r31);
|
|||
|
|
|
|||
|
|
return 1;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void _initialize_ppcobsd_nat ();
|
|||
|
|
void
|
|||
|
|
_initialize_ppcobsd_nat ()
|
|||
|
|
{
|
|||
|
|
add_inf_child_target (&the_ppc_obsd_nat_target);
|
|||
|
|
|
|||
|
|
/* General-purpose registers. */
|
|||
|
|
ppcobsd_reg_offsets.r0_offset = offsetof (struct reg, gpr);
|
|||
|
|
ppcobsd_reg_offsets.gpr_size = 4;
|
|||
|
|
ppcobsd_reg_offsets.xr_size = 4;
|
|||
|
|
ppcobsd_reg_offsets.pc_offset = offsetof (struct reg, pc);
|
|||
|
|
ppcobsd_reg_offsets.ps_offset = offsetof (struct reg, ps);
|
|||
|
|
ppcobsd_reg_offsets.cr_offset = offsetof (struct reg, cnd);
|
|||
|
|
ppcobsd_reg_offsets.lr_offset = offsetof (struct reg, lr);
|
|||
|
|
ppcobsd_reg_offsets.ctr_offset = offsetof (struct reg, cnt);
|
|||
|
|
ppcobsd_reg_offsets.xer_offset = offsetof (struct reg, xer);
|
|||
|
|
ppcobsd_reg_offsets.mq_offset = offsetof (struct reg, mq);
|
|||
|
|
|
|||
|
|
/* Floating-point registers. */
|
|||
|
|
ppcobsd_reg_offsets.f0_offset = offsetof (struct reg, fpr);
|
|||
|
|
ppcobsd_reg_offsets.fpscr_offset = -1;
|
|||
|
|
#ifdef PT_GETFPREGS
|
|||
|
|
ppcobsd_fpreg_offsets.f0_offset = offsetof (struct fpreg, fpr);
|
|||
|
|
ppcobsd_fpreg_offsets.fpscr_offset = offsetof (struct fpreg, fpscr);
|
|||
|
|
ppcobsd_fpreg_offsets.fpscr_size = 4;
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
/* Support debugging kernel virtual memory images. */
|
|||
|
|
bsd_kvm_add_target (ppcobsd_supply_pcb);
|
|||
|
|
}
|