238 lines
6.5 KiB
C
238 lines
6.5 KiB
C
/* Native-dependent code for Motorola 68000 BSD's.
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Copyright (C) 2004-2017 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 <sys/types.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include "m68k-tdep.h"
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#include "inf-ptrace.h"
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static int
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m68kbsd_gregset_supplies_p (int regnum)
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{
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return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM);
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}
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static int
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m68kbsd_fpregset_supplies_p (int regnum)
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{
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return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM);
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}
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/* Supply the general-purpose registers stored in GREGS to REGCACHE. */
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static void
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m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs)
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{
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const char *regs = gregs;
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int regnum;
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for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++)
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regcache_raw_supply (regcache, regnum, regs + regnum * 4);
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}
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/* Supply the floating-point registers stored in FPREGS to REGCACHE. */
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static void
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m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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const char *regs = fpregs;
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int regnum;
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for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++)
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regcache_raw_supply (regcache, regnum,
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regs + m68kbsd_fpreg_offset (gdbarch, regnum));
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}
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/* Collect the general-purpose registers from REGCACHE and store them
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in GREGS. */
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static void
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m68kbsd_collect_gregset (const struct regcache *regcache,
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void *gregs, int regnum)
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{
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char *regs = gregs;
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int i;
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for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
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{
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if (regnum == -1 || regnum == i)
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regcache_raw_collect (regcache, i, regs + i * 4);
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}
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}
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/* Collect the floating-point registers from REGCACHE and store them
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in FPREGS. */
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static void
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m68kbsd_collect_fpregset (struct regcache *regcache,
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void *fpregs, int regnum)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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char *regs = fpregs;
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int i;
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for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++)
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{
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if (regnum == -1 || regnum == i)
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regcache_raw_collect (regcache, i,
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regs + m68kbsd_fpreg_offset (gdbarch, i));
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}
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}
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/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
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for all registers (including the floating-point registers). */
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static void
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m68kbsd_fetch_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum)
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{
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if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
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{
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struct reg regs;
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if (ptrace (PT_GETREGS, ptid_get_pid (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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m68kbsd_supply_gregset (regcache, ®s);
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}
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if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
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{
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struct fpreg fpregs;
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if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
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(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating point status"));
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m68kbsd_supply_fpregset (regcache, &fpregs);
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}
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}
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/* Store register REGNUM back into the inferior. If REGNUM is -1, do
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this for all registers (including the floating-point registers). */
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static void
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m68kbsd_store_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum)
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{
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if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
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{
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struct reg regs;
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if (ptrace (PT_GETREGS, ptid_get_pid (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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m68kbsd_collect_gregset (regcache, ®s, regnum);
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if (ptrace (PT_SETREGS, ptid_get_pid (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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}
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if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
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{
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struct fpreg fpregs;
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if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
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(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating point status"));
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m68kbsd_collect_fpregset (regcache, &fpregs, regnum);
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if (ptrace (PT_SETFPREGS, ptid_get_pid (inferior_ptid),
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(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't write floating point status"));
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}
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}
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/* Support for debugging kernel virtual memory images. */
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#include <machine/pcb.h>
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#include "bsd-kvm.h"
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/* OpenBSD doesn't have these. */
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#ifndef PCB_REGS_FP
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#define PCB_REGS_FP 10
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#endif
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#ifndef PCB_REGS_SP
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#define PCB_REGS_SP 11
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#endif
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static int
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m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
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{
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int regnum, tmp;
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int i = 0;
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/* The following is true for NetBSD 1.6.2:
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The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for
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all callee-saved registers. From this information we reconstruct
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the register state as it would look when we just returned from
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cpu_switch(). */
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/* The stack pointer shouldn't be zero. */
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if (pcb->pcb_regs[PCB_REGS_SP] == 0)
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return 0;
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for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++)
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regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]);
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for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++)
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regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]);
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tmp = pcb->pcb_ps & 0xffff;
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regcache_raw_supply (regcache, M68K_PS_REGNUM, &tmp);
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read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (char *) &tmp, sizeof tmp);
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regcache_raw_supply (regcache, M68K_PC_REGNUM, &tmp);
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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_m68kbsd_nat (void);
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void
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_initialize_m68kbsd_nat (void)
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{
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struct target_ops *t;
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t = inf_ptrace_target ();
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t->to_fetch_registers = m68kbsd_fetch_inferior_registers;
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t->to_store_registers = m68kbsd_store_inferior_registers;
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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 (m68kbsd_supply_pcb);
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}
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