gdb/ppcnbsd-nat.c

   1 /* Native-dependent code for NetBSD/powerpc.
   2
   3    Copyright (C) 2002, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
   4
   5    Contributed by Wasabi Systems, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include <sys/types.h>
  23 #include <sys/ptrace.h>
  24 #include <machine/reg.h>
  25 #include <machine/frame.h>
  26 #include <machine/pcb.h>
  27
  28 #include "defs.h"
  29 #include "gdbcore.h"
  30 #include "inferior.h"
  31 #include "regcache.h"
  32
  33 #include "gdb_assert.h"
  34
  35 #include "ppc-tdep.h"
  36 #include "ppcnbsd-tdep.h"
  37 #include "bsd-kvm.h"
  38 #include "inf-ptrace.h"
  39
  40 /* Returns true if PT_GETREGS fetches this register.  */
  41
  42 static int
  43 getregs_supplies (int regnum)
  44 {
  45   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
  46
  47   return ((regnum >= tdep->ppc_gp0_regnum
  48            && regnum < tdep->ppc_gp0_regnum + ppc_num_gprs)
  49           || regnum == tdep->ppc_lr_regnum
  50           || regnum == tdep->ppc_cr_regnum
  51           || regnum == tdep->ppc_xer_regnum
  52           || regnum == tdep->ppc_ctr_regnum
  53           || regnum == gdbarch_pc_regnum (current_gdbarch));
  54 }
  55
  56 /* Like above, but for PT_GETFPREGS.  */
  57
  58 static int
  59 getfpregs_supplies (int regnum)
  60 {
  61   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
  62
  63   /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
  64      point registers.  Traditionally, GDB's register set has still
  65      listed the floating point registers for such machines, so this
  66      code is harmless.  However, the new E500 port actually omits the
  67      floating point registers entirely from the register set --- they
  68      don't even have register numbers assigned to them.
  69
  70      It's not clear to me how best to update this code, so this assert
  71      will alert the first person to encounter the NetBSD/E500
  72      combination to the problem.  */
  73   gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
  74
  75   return ((regnum >= tdep->ppc_fp0_regnum
  76            && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs)
  77           || regnum == tdep->ppc_fpscr_regnum);
  78 }
  79
  80 static void
  81 ppcnbsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
  82 {
  83   if (regnum == -1 || getregs_supplies (regnum))
  84     {
  85       struct reg regs;
  86
  87       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  88                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  89         perror_with_name (_("Couldn't get registers"));
  90
  91       ppc_supply_gregset (&ppcnbsd_gregset, regcache,
  92                           regnum, &regs, sizeof regs);
  93     }
  94
  95   if (regnum == -1 || getfpregs_supplies (regnum))
  96     {
  97       struct fpreg fpregs;
  98
  99       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 100                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 101         perror_with_name (_("Couldn't get FP registers"));
 102
 103       ppc_supply_fpregset (&ppcnbsd_fpregset, regcache,
 104                            regnum, &fpregs, sizeof fpregs);
 105     }
 106 }
 107
 108 static void
 109 ppcnbsd_store_inferior_registers (struct regcache *regcache, int regnum)
 110 {
 111   if (regnum == -1 || getregs_supplies (regnum))
 112     {
 113       struct reg regs;
 114
 115       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 116                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 117         perror_with_name (_("Couldn't get registers"));
 118
 119       ppc_collect_gregset (&ppcnbsd_gregset, regcache,
 120                            regnum, &regs, sizeof regs);
 121
 122       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 123                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 124         perror_with_name (_("Couldn't write registers"));
 125     }
 126
 127   if (regnum == -1 || getfpregs_supplies (regnum))
 128     {
 129       struct fpreg fpregs;
 130
 131       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 132                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 133         perror_with_name (_("Couldn't get FP registers"));
 134
 135       ppc_collect_fpregset (&ppcnbsd_fpregset, regcache,
 136                             regnum, &fpregs, sizeof fpregs);
 137
 138       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 139                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 140         perror_with_name (_("Couldn't set FP registers"));
 141     }
 142 }
 143
 144 static int
 145 ppcnbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 146 {
 147   struct switchframe sf;
 148   struct callframe cf;
 149   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 150   int i;
 151
 152   /* The stack pointer shouldn't be zero.  */
 153   if (pcb->pcb_sp == 0)
 154     return 0;
 155
 156   read_memory (pcb->pcb_sp, (gdb_byte *)&sf, sizeof sf);
 157   regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &sf.cr);
 158   regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 2, &sf.fixreg2);
 159   for (i = 0 ; i < 19 ; i++)
 160     regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 13 + i,
 161                          &sf.fixreg[i]);
 162
 163   read_memory(sf.sp, (gdb_byte *)&cf, sizeof(cf));
 164   regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 30, &cf.r30);
 165   regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 31, &cf.r31);
 166   regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 1, &cf.sp);
 167
 168   read_memory(cf.sp, (gdb_byte *)&cf, sizeof(cf));
 169   regcache_raw_supply (regcache, tdep->ppc_lr_regnum, &cf.lr);
 170   regcache_raw_supply (regcache, gdbarch_pc_regnum (current_gdbarch), &cf.lr);
 171
 172   return 1;
 173 }
 174
 175 /* Provide a prototype to silence -Wmissing-prototypes.  */
 176 void _initialize_ppcnbsd_nat (void);
 177
 178 void
 179 _initialize_ppcnbsd_nat (void)
 180 {
 181   struct target_ops *t;
 182
 183   /* Support debugging kernel virtual memory images.  */
 184   bsd_kvm_add_target (ppcnbsd_supply_pcb);
 185
 186   /* Add in local overrides.  */
 187   t = inf_ptrace_target ();
 188   t->to_fetch_registers = ppcnbsd_fetch_inferior_registers;
 189   t->to_store_registers = ppcnbsd_store_inferior_registers;
 190   add_target (t);
 191 }