219 lines
7.0 KiB
C
219 lines
7.0 KiB
C
/* Native-dependent code for OpenBSD/powerpc.
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Copyright (C) 2004-2018 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 <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 "ppc-obsd-tdep.h"
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#include "inf-ptrace.h"
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#include "obsd-nat.h"
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#include "bsd-kvm.h"
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struct ppc_obsd_nat_target final : public obsd_nat_target
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{
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void fetch_registers (struct regcache *, int) override;
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void store_registers (struct regcache *, int) override;
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};
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static ppc_obsd_nat_target the_ppc_obsd_nat_target;
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/* OpenBSD/powerpc didn't have PT_GETFPREGS/PT_SETFPREGS until release
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4.0. On older releases the floating-point registers are handled by
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PT_GETREGS/PT_SETREGS, but fpscr wasn't available.. */
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#ifdef PT_GETFPREGS
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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 regnum)
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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 ((regnum >= tdep->ppc_fp0_regnum
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&& regnum < tdep->ppc_fp0_regnum + ppc_num_fprs)
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|| regnum == tdep->ppc_fpscr_regnum);
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}
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#endif /* PT_GETFPREGS */
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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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void
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ppc_obsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
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{
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struct reg regs;
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pid_t pid = regcache->ptid ().pid ();
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if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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ppc_supply_gregset (&ppcobsd_gregset, regcache, -1,
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®s, sizeof regs);
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#ifndef PT_GETFPREGS
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ppc_supply_fpregset (&ppcobsd_gregset, regcache, -1,
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®s, sizeof regs);
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#endif
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#ifdef PT_GETFPREGS
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if (regnum == -1
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|| getfpregs_supplies (regcache->arch (), regnum))
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{
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struct fpreg fpregs;
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if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating point status"));
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ppc_supply_fpregset (&ppcobsd_fpregset, regcache, -1,
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&fpregs, sizeof fpregs);
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}
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#endif
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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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void
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ppc_obsd_nat_target::store_registers (struct regcache *regcache, int regnum)
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{
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struct reg regs;
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pid_t pid = regcache->ptid ().pid ();
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if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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ppc_collect_gregset (&ppcobsd_gregset, regcache,
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regnum, ®s, sizeof regs);
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#ifndef PT_GETFPREGS
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ppc_collect_fpregset (&ppcobsd_gregset, regcache,
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regnum, ®s, sizeof regs);
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#endif
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if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't write registers"));
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#ifdef PT_GETFPREGS
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if (regnum == -1
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|| getfpregs_supplies (regcache->arch (), regnum))
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{
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struct fpreg fpregs;
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if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating point status"));
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ppc_collect_fpregset (&ppcobsd_fpregset, regcache,
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regnum, &fpregs, sizeof fpregs);
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if (ptrace (PT_SETFPREGS, pid, (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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#endif
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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 *gdbarch = regcache->arch ();
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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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 (gdbarch_sp_regnum (gdbarch), &sf.sp);
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regcache->raw_supply (tdep->ppc_cr_regnum, &sf.cr);
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regcache->raw_supply (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 (regnum, &sf.fixreg[i]);
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read_memory (sf.sp, (gdb_byte *)&cf, sizeof cf);
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regcache->raw_supply (gdbarch_pc_regnum (gdbarch), &cf.lr);
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regcache->raw_supply (tdep->ppc_gp0_regnum + 30, &cf.r30);
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regcache->raw_supply (tdep->ppc_gp0_regnum + 31, &cf.r31);
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return 1;
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}
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void
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_initialize_ppcobsd_nat (void)
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{
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add_inf_child_target (&the_ppc_obsd_nat_target);
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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.gpr_size = 4;
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ppcobsd_reg_offsets.xr_size = 4;
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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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#ifdef PT_GETFPREGS
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ppcobsd_fpreg_offsets.f0_offset = offsetof (struct fpreg, fpr);
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ppcobsd_fpreg_offsets.fpscr_offset = offsetof (struct fpreg, fpscr);
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ppcobsd_fpreg_offsets.fpscr_size = 4;
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#endif
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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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