2013-02-04 Andreas Tobler <andreast@fgznet.ch>
* Makefile.in (ALL_TARGET_OBS): Add powerpc FreeBSD files. * configure.host: Add powerpc*-*-freebsd* target. * configure.tgt: Add target info for powerpc*-*-freebsd*. * ppcfbsd-nat.c, ppcfbsd-tdep.h, ppcfbsd-tdep.c: New files. * config/powerpc/fbsd.mh: New file.
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Andreas Tobler
parent
ace9af6f59
commit
dc18f110f2
8 changed files with 649 additions and 2 deletions
224
gdb/ppcfbsd-nat.c
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gdb/ppcfbsd-nat.c
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/* Native-dependent code for PowerPC's running FreeBSD, for GDB.
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Copyright (C) 2013 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "inferior.h"
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#include "regcache.h"
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#include "gdb_assert.h"
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#include <stddef.h>
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#include <sys/types.h>
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#include <sys/procfs.h>
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#include <sys/ptrace.h>
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#include <sys/signal.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include <machine/reg.h>
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#include "fbsd-nat.h"
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#include "gregset.h"
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#include "ppc-tdep.h"
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#include "ppcfbsd-tdep.h"
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#include "inf-ptrace.h"
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#include "bsd-kvm.h"
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/* Fill GDB's register array with the general-purpose register values
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in *GREGSETP. */
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void
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supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
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{
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const struct regset *regset = ppc_fbsd_gregset (sizeof (long));
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ppc_supply_gregset (regset, regcache, -1, gregsetp, sizeof (*gregsetp));
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}
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/* Fill register REGNO (if a gpr) in *GREGSETP with the value in GDB's
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register array. If REGNO is -1 do it for all registers. */
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void
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fill_gregset (const struct regcache *regcache,
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gdb_gregset_t *gregsetp, int regno)
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{
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const struct regset *regset = ppc_fbsd_gregset (sizeof (long));
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if (regno == -1)
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memset (gregsetp, 0, sizeof (*gregsetp));
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ppc_collect_gregset (regset, regcache, regno, gregsetp, sizeof (*gregsetp));
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}
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/* Fill GDB's register array with the floating-point register values
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in *FPREGSETP. */
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void
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supply_fpregset (struct regcache *regcache, const gdb_fpregset_t * fpregsetp)
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{
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const struct regset *regset = ppc_fbsd_fpregset ();
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ppc_supply_fpregset (regset, regcache, -1,
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fpregsetp, sizeof (*fpregsetp));
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}
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/* Fill register REGNO in *FGREGSETP with the value in GDB's
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register array. If REGNO is -1 do it for all registers. */
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void
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fill_fpregset (const struct regcache *regcache,
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gdb_fpregset_t *fpregsetp, int regno)
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{
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const struct regset *regset = ppc_fbsd_fpregset ();
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ppc_collect_fpregset (regset, regcache, regno,
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fpregsetp, sizeof (*fpregsetp));
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}
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/* Returns true if PT_GETFPREGS fetches this register. */
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static int
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getfpregs_supplies (struct gdbarch *gdbarch, int regno)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
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point registers. Traditionally, GDB's register set has still
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listed the floating point registers for such machines, so this
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code is harmless. However, the new E500 port actually omits the
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floating point registers entirely from the register set --- they
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don't even have register numbers assigned to them.
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It's not clear to me how best to update this code, so this assert
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will alert the first person to encounter the NetBSD/E500
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combination to the problem. */
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gdb_assert (ppc_floating_point_unit_p (gdbarch));
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return ((regno >= tdep->ppc_fp0_regnum
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&& regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
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|| regno == tdep->ppc_fpscr_regnum);
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}
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/* Fetch register REGNO from the child process. If REGNO is -1, do it
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for all registers. */
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static void
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ppcfbsd_fetch_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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gdb_gregset_t regs;
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if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
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(PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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supply_gregset (regcache, ®s);
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if (regno == -1 || getfpregs_supplies (get_regcache_arch (regcache), regno))
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{
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const struct regset *fpregset = ppc_fbsd_fpregset ();
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gdb_fpregset_t fpregs;
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if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
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(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get FP registers"));
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ppc_supply_fpregset (fpregset, regcache, regno, &fpregs, sizeof fpregs);
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}
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}
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/* Store register REGNO back into the child process. If REGNO is -1,
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do this for all registers. */
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static void
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ppcfbsd_store_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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gdb_gregset_t regs;
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if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
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(PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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fill_gregset (regcache, ®s, regno);
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if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
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(PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't write registers"));
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if (regno == -1 || getfpregs_supplies (get_regcache_arch (regcache), regno))
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{
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gdb_fpregset_t fpregs;
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if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
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(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get FP registers"));
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fill_fpregset (regcache, &fpregs, regno);
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if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
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(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't set FP registers"));
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}
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}
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/* Architecture specific function that reconstructs the
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register state from PCB (Process Control Block) and supplies it
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to REGCACHE. */
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static int
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ppcfbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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int i, regnum;
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/* The stack pointer shouldn't be zero. */
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if (pcb->pcb_sp == 0)
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return 0;
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regcache_raw_supply (regcache, gdbarch_sp_regnum (gdbarch), &pcb->pcb_sp);
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regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &pcb->pcb_cr);
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regcache_raw_supply (regcache, tdep->ppc_lr_regnum, &pcb->pcb_lr);
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for (i = 0, regnum = tdep->ppc_gp0_regnum + 14; i < 20; i++, regnum++)
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regcache_raw_supply (regcache, regnum, &pcb->pcb_context[i]);
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return 1;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_ppcfbsd_nat (void);
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void
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_initialize_ppcfbsd_nat (void)
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{
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struct target_ops *t;
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/* Add in local overrides. */
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t = inf_ptrace_target ();
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t->to_fetch_registers = ppcfbsd_fetch_inferior_registers;
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t->to_store_registers = ppcfbsd_store_inferior_registers;
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t->to_pid_to_exec_file = fbsd_pid_to_exec_file;
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t->to_find_memory_regions = fbsd_find_memory_regions;
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t->to_make_corefile_notes = fbsd_make_corefile_notes;
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add_target (t);
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/* Support debugging kernel virtual memory images. */
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bsd_kvm_add_target (ppcfbsd_supply_pcb);
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}
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