0ae4f2cb51
<machine/frame.h>, <machine/pcb.h> and "bsd-kvm.h". (ppcobsd_supply_pcb): New function. (_initialize_ppcobsd_nat): Enable libkvm interface. * Makefile.in (ppcobsd-nat.o): Update dependencies.
152 lines
4.9 KiB
C
152 lines
4.9 KiB
C
/* Native-dependent code for OpenBSD/powerpc.
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Copyright 2004, 2005 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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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 <stddef.h>
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#include <sys/types.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 "ppc-tdep.h"
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#include "ppcobsd-tdep.h"
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#include "inf-ptrace.h"
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#include "bsd-kvm.h"
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/* OpenBSD/powerpc doesn't have PT_GETFPREGS/PT_SETFPREGS like
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NetBSD/powerpc and FreeBSD/powerpc. */
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/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
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for all registers. */
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static void
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ppcobsd_fetch_registers (int regnum)
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{
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struct reg 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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ppcobsd_supply_gregset (&ppcobsd_gregset, current_regcache, -1,
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®s, sizeof regs);
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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. */
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static void
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ppcobsd_store_registers (int regnum)
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{
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struct reg 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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ppcobsd_collect_gregset (&ppcobsd_gregset, current_regcache,
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regnum, ®s, sizeof regs);
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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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}
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static int
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ppcobsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
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struct switchframe sf;
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struct callframe cf;
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int i, regnum;
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/* The following is true for OpenBSD 3.7:
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The pcb contains %r1 (the stack pointer) at the point of the
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context switch in cpu_switch(). At that point we have a stack
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frame as described by `struct switchframe', and below that a call
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frame as described by `struct callframe'. From this information
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we reconstruct the register state as it would look when we are in
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cpu_switch(). */
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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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read_memory (pcb->pcb_sp, (gdb_byte *)&sf, sizeof sf);
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regcache_raw_supply (regcache, SP_REGNUM, &sf.sp);
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regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &sf.cr);
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regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 2, &sf.fixreg2);
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for (i = 0, regnum = tdep->ppc_gp0_regnum + 13; i < 19; i++, regnum++)
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regcache_raw_supply (regcache, regnum, &sf.fixreg[i]);
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read_memory (sf.sp, (gdb_byte *)&cf, sizeof cf);
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regcache_raw_supply (regcache, PC_REGNUM, &cf.lr);
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regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 30, &cf.r30);
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regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 31, &cf.r31);
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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_ppcobsd_nat (void);
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void
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_initialize_ppcobsd_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 = ppcobsd_fetch_registers;
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t->to_store_registers = ppcobsd_store_registers;
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add_target (t);
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/* General-purpose registers. */
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ppcobsd_reg_offsets.r0_offset = offsetof (struct reg, gpr);
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ppcobsd_reg_offsets.pc_offset = offsetof (struct reg, pc);
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ppcobsd_reg_offsets.ps_offset = offsetof (struct reg, ps);
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ppcobsd_reg_offsets.cr_offset = offsetof (struct reg, cnd);
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ppcobsd_reg_offsets.lr_offset = offsetof (struct reg, lr);
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ppcobsd_reg_offsets.ctr_offset = offsetof (struct reg, cnt);
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ppcobsd_reg_offsets.xer_offset = offsetof (struct reg, xer);
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ppcobsd_reg_offsets.mq_offset = offsetof (struct reg, mq);
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/* Floating-point registers. */
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ppcobsd_reg_offsets.f0_offset = offsetof (struct reg, fpr);
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ppcobsd_reg_offsets.fpscr_offset = -1;
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/* AltiVec registers. */
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ppcobsd_reg_offsets.vr0_offset = offsetof (struct vreg, vreg);
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ppcobsd_reg_offsets.vscr_offset = offsetof (struct vreg, vscr);
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ppcobsd_reg_offsets.vrsave_offset = offsetof (struct vreg, vrsave);
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/* Support debugging kernel virtual memory images. */
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bsd_kvm_add_target (ppcobsd_supply_pcb);
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}
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