gdb/ppcnbsd-nat.c

   1 /* Native-dependent code for NetBSD/powerpc.
   2
   3    Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6    Contributed by Wasabi Systems, Inc.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include <sys/types.h>
  24 #include <sys/ptrace.h>
  25 #include <machine/reg.h>
  26 #include <machine/frame.h>
  27 #include <machine/pcb.h>
  28
  29 #include "defs.h"
  30 #include "gdbcore.h"
  31 #include "inferior.h"
  32 #include "regcache.h"
  33
  34 #include "gdb_assert.h"
  35
  36 #include "ppc-tdep.h"
  37 #include "ppcnbsd-tdep.h"
  38 #include "bsd-kvm.h"
  39 #include "inf-ptrace.h"
  40
  41 /* Returns true if PT_GETREGS fetches this register.  */
  42
  43 static int
  44 getregs_supplies (struct gdbarch *gdbarch, int regnum)
  45 {
  46   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  47
  48   return ((regnum >= tdep->ppc_gp0_regnum
  49            && regnum < tdep->ppc_gp0_regnum + ppc_num_gprs)
  50           || regnum == tdep->ppc_lr_regnum
  51           || regnum == tdep->ppc_cr_regnum
  52           || regnum == tdep->ppc_xer_regnum
  53           || regnum == tdep->ppc_ctr_regnum
  54           || regnum == gdbarch_pc_regnum (gdbarch));
  55 }
  56
  57 /* Like above, but for PT_GETFPREGS.  */
  58
  59 static int
  60 getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
  61 {
  62   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  63
  64   /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
  65      point registers.  Traditionally, GDB's register set has still
  66      listed the floating point registers for such machines, so this
  67      code is harmless.  However, the new E500 port actually omits the
  68      floating point registers entirely from the register set --- they
  69      don't even have register numbers assigned to them.
  70
  71      It's not clear to me how best to update this code, so this assert
  72      will alert the first person to encounter the NetBSD/E500
  73      combination to the problem.  */
  74   gdb_assert (ppc_floating_point_unit_p (gdbarch));
  75
  76   return ((regnum >= tdep->ppc_fp0_regnum
  77            && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs)
  78           || regnum == tdep->ppc_fpscr_regnum);
  79 }
  80
  81 static void
  82 ppcnbsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
  83 {
  84   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  85
  86   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
  87     {
  88       struct reg regs;
  89
  90       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  91                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  92         perror_with_name (_("Couldn't get registers"));
  93
  94       ppc_supply_gregset (&ppcnbsd_gregset, regcache,
  95                           regnum, &regs, sizeof regs);
  96     }
  97
  98   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
  99     {
 100       struct fpreg fpregs;
 101
 102       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 103                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 104         perror_with_name (_("Couldn't get FP registers"));
 105
 106       ppc_supply_fpregset (&ppcnbsd_fpregset, regcache,
 107                            regnum, &fpregs, sizeof fpregs);
 108     }
 109 }
 110
 111 static void
 112 ppcnbsd_store_inferior_registers (struct regcache *regcache, int regnum)
 113 {
 114   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 115
 116   if (regnum == -1 || getregs_supplies (gdbarch, regnum))
 117     {
 118       struct reg regs;
 119
 120       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 121                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 122         perror_with_name (_("Couldn't get registers"));
 123
 124       ppc_collect_gregset (&ppcnbsd_gregset, regcache,
 125                            regnum, &regs, sizeof regs);
 126
 127       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 128                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 129         perror_with_name (_("Couldn't write registers"));
 130     }
 131
 132   if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
 133     {
 134       struct fpreg fpregs;
 135
 136       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 137                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 138         perror_with_name (_("Couldn't get FP registers"));
 139
 140       ppc_collect_fpregset (&ppcnbsd_fpregset, regcache,
 141                             regnum, &fpregs, sizeof fpregs);
 142
 143       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 144                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 145         perror_with_name (_("Couldn't set FP registers"));
 146     }
 147 }
 148
 149 static int
 150 ppcnbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 151 {
 152   struct switchframe sf;
 153   struct callframe cf;
 154   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 155   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 156   int i;
 157
 158   /* The stack pointer shouldn't be zero.  */
 159   if (pcb->pcb_sp == 0)
 160     return 0;
 161
 162   read_memory (pcb->pcb_sp, (gdb_byte *)&sf, sizeof sf);
 163   regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &sf.cr);
 164   regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 2, &sf.fixreg2);
 165   for (i = 0 ; i < 19 ; i++)
 166     regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 13 + i,
 167                          &sf.fixreg[i]);
 168
 169   read_memory(sf.sp, (gdb_byte *)&cf, sizeof(cf));
 170   regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 30, &cf.r30);
 171   regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 31, &cf.r31);
 172   regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 1, &cf.sp);
 173
 174   read_memory(cf.sp, (gdb_byte *)&cf, sizeof(cf));
 175   regcache_raw_supply (regcache, tdep->ppc_lr_regnum, &cf.lr);
 176   regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &cf.lr);
 177
 178   return 1;
 179 }
 180
 181 /* Provide a prototype to silence -Wmissing-prototypes.  */
 182 void _initialize_ppcnbsd_nat (void);
 183
 184 void
 185 _initialize_ppcnbsd_nat (void)
 186 {
 187   struct target_ops *t;
 188
 189   /* Support debugging kernel virtual memory images.  */
 190   bsd_kvm_add_target (ppcnbsd_supply_pcb);
 191
 192   /* Add in local overrides.  */
 193   t = inf_ptrace_target ();
 194   t->to_fetch_registers = ppcnbsd_fetch_inferior_registers;
 195   t->to_store_registers = ppcnbsd_store_inferior_registers;
 196   add_target (t);
 197 }