gdb/sparc64-netbsd-nat.c

   1 /* Native-dependent code for NetBSD/sparc64.
   2
   3    Copyright (C) 2003-2023 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_gregmap *gregmap,
  34                             struct regcache *regcache,
  35                             int regnum, const void *gregs)
  36 {
  37   int sparc32 = (gdbarch_ptr_bit (regcache->arch ()) == 32);
  38
  39   if (sparc32)
  40     sparc32_supply_gregset (&sparc32nbsd_gregmap, regcache, regnum, gregs);
  41   else
  42     sparc64_supply_gregset (&sparc64nbsd_gregmap, regcache, regnum, gregs);
  43 }
  44
  45 static void
  46 sparc64nbsd_collect_gregset (const struct sparc_gregmap *gregmap,
  47                              const struct regcache *regcache,
  48                              int regnum, void *gregs)
  49 {
  50   int sparc32 = (gdbarch_ptr_bit (regcache->arch ()) == 32);
  51
  52   if (sparc32)
  53     sparc32_collect_gregset (&sparc32nbsd_gregmap, regcache, regnum, gregs);
  54   else
  55     sparc64_collect_gregset (&sparc64nbsd_gregmap, regcache, regnum, gregs);
  56 }
  57
  58 static void
  59 sparc64nbsd_supply_fpregset (const struct sparc_fpregmap *fpregmap,
  60                              struct regcache *regcache,
  61                              int regnum, const void *fpregs)
  62 {
  63   int sparc32 = (gdbarch_ptr_bit (regcache->arch ()) == 32);
  64
  65   if (sparc32)
  66     sparc32_supply_fpregset (&sparc32_bsd_fpregmap, regcache, regnum, fpregs);
  67   else
  68     sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
  69 }
  70
  71 static void
  72 sparc64nbsd_collect_fpregset (const struct sparc_fpregmap *fpregmap,
  73                               const struct regcache *regcache,
  74                               int regnum, void *fpregs)
  75 {
  76   int sparc32 = (gdbarch_ptr_bit (regcache->arch ()) == 32);
  77
  78   if (sparc32)
  79     sparc32_collect_fpregset (&sparc32_bsd_fpregmap, regcache, regnum, fpregs);
  80   else
  81     sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
  82 }
  83
  84 /* Determine whether `gregset_t' contains register REGNUM.  */
  85
  86 static int
  87 sparc64nbsd_gregset_supplies_p (struct gdbarch *gdbarch, int regnum)
  88 {
  89   if (gdbarch_ptr_bit (gdbarch) == 32)
  90     return sparc32_gregset_supplies_p (gdbarch, regnum);
  91
  92   /* Integer registers.  */
  93   if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
  94       || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
  95       || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
  96       || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
  97     return 1;
  98
  99   /* Control registers.  */
 100   if (regnum == SPARC64_PC_REGNUM
 101       || regnum == SPARC64_NPC_REGNUM
 102       || regnum == SPARC64_STATE_REGNUM
 103       || regnum == SPARC64_Y_REGNUM)
 104     return 1;
 105
 106   return 0;
 107 }
 108
 109 /* Determine whether `fpregset_t' contains register REGNUM.  */
 110
 111 static int
 112 sparc64nbsd_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum)
 113 {
 114   if (gdbarch_ptr_bit (gdbarch) == 32)
 115     return sparc32_fpregset_supplies_p (gdbarch, regnum);
 116
 117   /* Floating-point registers.  */
 118   if ((regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
 119       || (regnum >= SPARC64_F32_REGNUM && regnum <= SPARC64_F62_REGNUM))
 120     return 1;
 121
 122   /* Control registers.  */
 123   if (regnum == SPARC64_FSR_REGNUM)
 124     return 1;
 125
 126   return 0;
 127 }
 128 \f
 129
 130 /* Support for debugging kernel virtual memory images.  */
 131
 132 #include <sys/types.h>
 133 #include <machine/pcb.h>
 134
 135 #include "bsd-kvm.h"
 136
 137 static int
 138 sparc64nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 139 {
 140   u_int64_t state;
 141   int regnum;
 142
 143   /* The following is true for NetBSD 1.6.2:
 144
 145      The pcb contains %sp and %pc, %pstate and %cwp.  From this
 146      information we reconstruct the register state as it would look
 147      when we just returned from cpu_switch().  */
 148
 149   /* The stack pointer shouldn't be zero.  */
 150   if (pcb->pcb_sp == 0)
 151     return 0;
 152
 153   /* If the program counter is zero, this is probably a core dump, and
 154      we can get %pc from the stack.  */
 155   if (pcb->pcb_pc == 0)
 156       read_memory(pcb->pcb_sp + BIAS - 176 + (11 * 8),
 157                   (gdb_byte *)&pcb->pcb_pc, sizeof pcb->pcb_pc);
 158
 159   regcache->raw_supply (SPARC_SP_REGNUM, &pcb->pcb_sp);
 160   regcache->raw_supply (SPARC64_PC_REGNUM, &pcb->pcb_pc);
 161
 162   state = pcb->pcb_pstate << 8 | pcb->pcb_cwp;
 163   regcache->raw_supply (SPARC64_STATE_REGNUM, &state);
 164
 165   sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
 166
 167   return 1;
 168 }
 169
 170 /* We've got nothing to add to the generic SPARC target.  */
 171 static sparc_target<inf_ptrace_target> the_sparc64_nbsd_nat_target;
 172
 173 void _initialize_sparc64nbsd_nat ();
 174 void
 175 _initialize_sparc64nbsd_nat ()
 176 {
 177   sparc_supply_gregset = sparc64nbsd_supply_gregset;
 178   sparc_collect_gregset = sparc64nbsd_collect_gregset;
 179   sparc_supply_fpregset = sparc64nbsd_supply_fpregset;
 180   sparc_collect_fpregset = sparc64nbsd_collect_fpregset;
 181   sparc_gregset_supplies_p = sparc64nbsd_gregset_supplies_p;
 182   sparc_fpregset_supplies_p = sparc64nbsd_fpregset_supplies_p;
 183
 184   add_inf_child_target (&the_sparc64_nbsd_nat_target);
 185
 186   /* Support debugging kernel virtual memory images.  */
 187   bsd_kvm_add_target (sparc64nbsd_supply_pcb);
 188 }