gdb/sparc64-obsd-nat.c

   1 /* Native-dependent code for OpenBSD/sparc64.
   2
   3    Copyright (C) 2003-2024 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 "gdbcore.h"
  21 #include "regcache.h"
  22 #include "target.h"
  23
  24 #include "sparc64-tdep.h"
  25 #include "sparc-nat.h"
  26 #include "obsd-nat.h"
  27
  28 /* Determine whether `gregset_t' contains register REGNUM.  */
  29
  30 static int
  31 sparc64obsd_gregset_supplies_p (struct gdbarch *gdbarch, int regnum)
  32 {
  33   /* Integer registers.  */
  34   if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
  35       || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
  36       || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
  37       || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
  38     return 1;
  39
  40   /* Control registers.  */
  41   if (regnum == SPARC64_PC_REGNUM
  42       || regnum == SPARC64_NPC_REGNUM
  43       || regnum == SPARC64_STATE_REGNUM
  44       || regnum == SPARC64_Y_REGNUM)
  45     return 1;
  46
  47   return 0;
  48 }
  49
  50 /* Determine whether `fpregset_t' contains register REGNUM.  */
  51
  52 static int
  53 sparc64obsd_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum)
  54 {
  55   /* Floating-point registers.  */
  56   if ((regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
  57       || (regnum >= SPARC64_F32_REGNUM && regnum <= SPARC64_F62_REGNUM))
  58     return 1;
  59
  60   /* Control registers.  */
  61   if (regnum == SPARC64_FSR_REGNUM)
  62     return 1;
  63
  64   return 0;
  65 }
  66 \f
  67
  68 /* Support for debugging kernel virtual memory images.  */
  69
  70 #include <sys/types.h>
  71 #include <machine/pcb.h>
  72
  73 #include "bsd-kvm.h"
  74
  75 static int
  76 sparc64obsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
  77 {
  78   u_int64_t state;
  79   int regnum;
  80
  81   /* The following is true for OpenBSD 3.0:
  82
  83      The pcb contains %sp and %pc, %pstate and %cwp.  From this
  84      information we reconstruct the register state as it would look
  85      when we just returned from cpu_switch().  */
  86
  87   /* The stack pointer shouldn't be zero.  */
  88   if (pcb->pcb_sp == 0)
  89     return 0;
  90
  91   /* If the program counter is zero, this is probably a core dump, and
  92      we can get %pc from the stack.  */
  93   if (pcb->pcb_pc == 0)
  94       read_memory(pcb->pcb_sp + BIAS - 176 + (11 * 8),
  95                   (gdb_byte *)&pcb->pcb_pc, sizeof pcb->pcb_pc);
  96
  97   regcache->raw_supply (SPARC_SP_REGNUM, &pcb->pcb_sp);
  98   regcache->raw_supply (SPARC64_PC_REGNUM, &pcb->pcb_pc);
  99
 100   state = pcb->pcb_pstate << 8 | pcb->pcb_cwp;
 101   regcache->raw_supply (SPARC64_STATE_REGNUM, &state);
 102
 103   sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
 104
 105   return 1;
 106 }
 107
 108 /* Add some extra features to the generic SPARC target.  */
 109 static sparc_target<obsd_nat_target> the_sparc64_obsd_nat_target;
 110
 111 void _initialize_sparc64obsd_nat ();
 112 void
 113 _initialize_sparc64obsd_nat ()
 114 {
 115   sparc_supply_gregset = sparc64_supply_gregset;
 116   sparc_collect_gregset = sparc64_collect_gregset;
 117   sparc_supply_fpregset = sparc64_supply_fpregset;
 118   sparc_collect_fpregset = sparc64_collect_fpregset;
 119   sparc_gregset_supplies_p = sparc64obsd_gregset_supplies_p;
 120   sparc_fpregset_supplies_p = sparc64obsd_fpregset_supplies_p;
 121
 122   sparc_gregmap = &sparc64nbsd_gregmap;
 123   sparc_fpregmap = &sparc64_bsd_fpregmap;
 124
 125   /* Add some extra features to the generic SPARC target.  */
 126   add_inf_child_target (&the_sparc64_obsd_nat_target);
 127
 128   /* Support debugging kernel virtual memory images.  */
 129   bsd_kvm_add_target (sparc64obsd_supply_pcb);
 130 }