gdb/sparc64nbsd-nat.c

   1 /* Native-dependent code for NetBSD/sparc64.
   2
   3    Copyright (C) 2003-2004, 2006-2012 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "gdbcore.h"
  22 #include "regcache.h"
  23 #include "target.h"
  24
  25 #include "sparc64-tdep.h"
  26 #include "sparc-nat.h"
  27
  28 /* NetBSD is different from the other OSes that support both SPARC and
  29    UltraSPARC in that the result of ptrace(2) depends on whether the
  30    traced process is 32-bit or 64-bit.  */
  31
  32 static void
  33 sparc64nbsd_supply_gregset (const struct sparc_gregset *gregset,
  34                             struct regcache *regcache,
  35                             int regnum, const void *gregs)
  36 {
  37   int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);
  38
  39   if (sparc32)
  40     sparc32_supply_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs);
  41   else
  42     sparc64_supply_gregset (&sparc64nbsd_gregset, regcache, regnum, gregs);
  43 }
  44
  45 static void
  46 sparc64nbsd_collect_gregset (const struct sparc_gregset *gregset,
  47                              const struct regcache *regcache,
  48                              int regnum, void *gregs)
  49 {
  50   int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);
  51
  52   if (sparc32)
  53     sparc32_collect_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs);
  54   else
  55     sparc64_collect_gregset (&sparc64nbsd_gregset, regcache, regnum, gregs);
  56 }
  57
  58 static void
  59 sparc64nbsd_supply_fpregset (struct regcache *regcache,
  60                              int regnum, const void *fpregs)
  61 {
  62   int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);
  63
  64   if (sparc32)
  65     sparc32_supply_fpregset (regcache, regnum, fpregs);
  66   else
  67     sparc64_supply_fpregset (regcache, regnum, fpregs);
  68 }
  69
  70 static void
  71 sparc64nbsd_collect_fpregset (const struct regcache *regcache,
  72                               int regnum, void *fpregs)
  73 {
  74   int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);
  75
  76   if (sparc32)
  77     sparc32_collect_fpregset (regcache, regnum, fpregs);
  78   else
  79     sparc64_collect_fpregset (regcache, regnum, fpregs);
  80 }
  81
  82 /* Determine whether `gregset_t' contains register REGNUM.  */
  83
  84 static int
  85 sparc64nbsd_gregset_supplies_p (struct gdbarch *gdbarch, int regnum)
  86 {
  87   if (gdbarch_ptr_bit (gdbarch) == 32)
  88     return sparc32_gregset_supplies_p (gdbarch, regnum);
  89
  90   /* Integer registers.  */
  91   if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
  92       || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
  93       || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
  94       || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
  95     return 1;
  96
  97   /* Control registers.  */
  98   if (regnum == SPARC64_PC_REGNUM
  99       || regnum == SPARC64_NPC_REGNUM
 100       || regnum == SPARC64_STATE_REGNUM
 101       || regnum == SPARC64_Y_REGNUM)
 102     return 1;
 103
 104   return 0;
 105 }
 106
 107 /* Determine whether `fpregset_t' contains register REGNUM.  */
 108
 109 static int
 110 sparc64nbsd_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum)
 111 {
 112   if (gdbarch_ptr_bit (gdbarch) == 32)
 113     return sparc32_fpregset_supplies_p (gdbarch, regnum);
 114
 115   /* Floating-point registers.  */
 116   if ((regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
 117       || (regnum >= SPARC64_F32_REGNUM && regnum <= SPARC64_F62_REGNUM))
 118     return 1;
 119
 120   /* Control registers.  */
 121   if (regnum == SPARC64_FSR_REGNUM)
 122     return 1;
 123
 124   return 0;
 125 }
 126 \f
 127
 128 /* Support for debugging kernel virtual memory images.  */
 129
 130 #include <sys/types.h>
 131 #include <machine/pcb.h>
 132
 133 #include "bsd-kvm.h"
 134
 135 static int
 136 sparc64nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 137 {
 138   u_int64_t state;
 139   int regnum;
 140
 141   /* The following is true for NetBSD 1.6.2:
 142
 143      The pcb contains %sp and %pc, %pstate and %cwp.  From this
 144      information we reconstruct the register state as it would look
 145      when we just returned from cpu_switch().  */
 146
 147   /* The stack pointer shouldn't be zero.  */
 148   if (pcb->pcb_sp == 0)
 149     return 0;
 150
 151   /* If the program counter is zero, this is probably a core dump, and
 152      we can get %pc from the stack.  */
 153   if (pcb->pcb_pc == 0)
 154       read_memory(pcb->pcb_sp + BIAS - 176 + (11 * 8),
 155                   (gdb_byte *)&pcb->pcb_pc, sizeof pcb->pcb_pc);
 156
 157   regcache_raw_supply (regcache, SPARC_SP_REGNUM, &pcb->pcb_sp);
 158   regcache_raw_supply (regcache, SPARC64_PC_REGNUM, &pcb->pcb_pc);
 159
 160   state = pcb->pcb_pstate << 8 | pcb->pcb_cwp;
 161   regcache_raw_supply (regcache, SPARC64_STATE_REGNUM, &state);
 162
 163   sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
 164
 165   return 1;
 166 }
 167
 168 \f
 169 /* Provide a prototype to silence -Wmissing-prototypes.  */
 170 void _initialize_sparc64nbsd_nat (void);
 171
 172 void
 173 _initialize_sparc64nbsd_nat (void)
 174 {
 175   sparc_supply_gregset = sparc64nbsd_supply_gregset;
 176   sparc_collect_gregset = sparc64nbsd_collect_gregset;
 177   sparc_supply_fpregset = sparc64nbsd_supply_fpregset;
 178   sparc_collect_fpregset = sparc64nbsd_collect_fpregset;
 179   sparc_gregset_supplies_p = sparc64nbsd_gregset_supplies_p;
 180   sparc_fpregset_supplies_p = sparc64nbsd_fpregset_supplies_p;
 181
 182   /* We've got nothing to add to the generic SPARC target.  */
 183   add_target (sparc_target ());
 184
 185   /* Support debugging kernel virtual memory images.  */
 186   bsd_kvm_add_target (sparc64nbsd_supply_pcb);
 187 }