gdb/sparc64nbsd-nat.c

   1 /* Native-dependent code for NetBSD/sparc64.
   2
   3    Copyright (C) 2003-2014 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 (const struct sparc_fpregset *fpregset,
  60                              struct regcache *regcache,
  61                              int regnum, const void *fpregs)
  62 {
  63   int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);
  64
  65   if (sparc32)
  66     sparc32_supply_fpregset (&sparc32_bsd_fpregset, regcache, regnum, fpregs);
  67   else
  68     sparc64_supply_fpregset (&sparc64_bsd_fpregset, regcache, regnum, fpregs);
  69 }
  70
  71 static void
  72 sparc64nbsd_collect_fpregset (const struct regcache *regcache,
  73                               int regnum, void *fpregs)
  74 {
  75   int sparc32 = (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32);
  76
  77   if (sparc32)
  78     sparc32_collect_fpregset (&sparc32_bsd_fpregset, regcache, regnum, fpregs);
  79   else
  80     sparc64_collect_fpregset (&sparc64_bsd_fpregset, regcache, regnum, fpregs);
  81 }
  82
  83 /* Determine whether `gregset_t' contains register REGNUM.  */
  84
  85 static int
  86 sparc64nbsd_gregset_supplies_p (struct gdbarch *gdbarch, int regnum)
  87 {
  88   if (gdbarch_ptr_bit (gdbarch) == 32)
  89     return sparc32_gregset_supplies_p (gdbarch, regnum);
  90
  91   /* Integer registers.  */
  92   if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
  93       || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
  94       || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
  95       || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
  96     return 1;
  97
  98   /* Control registers.  */
  99   if (regnum == SPARC64_PC_REGNUM
 100       || regnum == SPARC64_NPC_REGNUM
 101       || regnum == SPARC64_STATE_REGNUM
 102       || regnum == SPARC64_Y_REGNUM)
 103     return 1;
 104
 105   return 0;
 106 }
 107
 108 /* Determine whether `fpregset_t' contains register REGNUM.  */
 109
 110 static int
 111 sparc64nbsd_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum)
 112 {
 113   if (gdbarch_ptr_bit (gdbarch) == 32)
 114     return sparc32_fpregset_supplies_p (gdbarch, regnum);
 115
 116   /* Floating-point registers.  */
 117   if ((regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
 118       || (regnum >= SPARC64_F32_REGNUM && regnum <= SPARC64_F62_REGNUM))
 119     return 1;
 120
 121   /* Control registers.  */
 122   if (regnum == SPARC64_FSR_REGNUM)
 123     return 1;
 124
 125   return 0;
 126 }
 127 \f
 128
 129 /* Support for debugging kernel virtual memory images.  */
 130
 131 #include <sys/types.h>
 132 #include <machine/pcb.h>
 133
 134 #include "bsd-kvm.h"
 135
 136 static int
 137 sparc64nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 138 {
 139   u_int64_t state;
 140   int regnum;
 141
 142   /* The following is true for NetBSD 1.6.2:
 143
 144      The pcb contains %sp and %pc, %pstate and %cwp.  From this
 145      information we reconstruct the register state as it would look
 146      when we just returned from cpu_switch().  */
 147
 148   /* The stack pointer shouldn't be zero.  */
 149   if (pcb->pcb_sp == 0)
 150     return 0;
 151
 152   /* If the program counter is zero, this is probably a core dump, and
 153      we can get %pc from the stack.  */
 154   if (pcb->pcb_pc == 0)
 155       read_memory(pcb->pcb_sp + BIAS - 176 + (11 * 8),
 156                   (gdb_byte *)&pcb->pcb_pc, sizeof pcb->pcb_pc);
 157
 158   regcache_raw_supply (regcache, SPARC_SP_REGNUM, &pcb->pcb_sp);
 159   regcache_raw_supply (regcache, SPARC64_PC_REGNUM, &pcb->pcb_pc);
 160
 161   state = pcb->pcb_pstate << 8 | pcb->pcb_cwp;
 162   regcache_raw_supply (regcache, SPARC64_STATE_REGNUM, &state);
 163
 164   sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
 165
 166   return 1;
 167 }
 168
 169 \f
 170 /* Provide a prototype to silence -Wmissing-prototypes.  */
 171 void _initialize_sparc64nbsd_nat (void);
 172
 173 void
 174 _initialize_sparc64nbsd_nat (void)
 175 {
 176   sparc_supply_gregset = sparc64nbsd_supply_gregset;
 177   sparc_collect_gregset = sparc64nbsd_collect_gregset;
 178   sparc_supply_fpregset = sparc64nbsd_supply_fpregset;
 179   sparc_collect_fpregset = sparc64nbsd_collect_fpregset;
 180   sparc_gregset_supplies_p = sparc64nbsd_gregset_supplies_p;
 181   sparc_fpregset_supplies_p = sparc64nbsd_fpregset_supplies_p;
 182
 183   /* We've got nothing to add to the generic SPARC target.  */
 184   add_target (sparc_target ());
 185
 186   /* Support debugging kernel virtual memory images.  */
 187   bsd_kvm_add_target (sparc64nbsd_supply_pcb);
 188 }