gdb/sparc64-obsd-nat.c

   1 /* Native-dependent code for OpenBSD/sparc64.
   2
   3    Copyright (C) 2003-2018 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 #include "obsd-nat.h"
  28
  29 /* Determine whether `gregset_t' contains register REGNUM.  */
  30
  31 static int
  32 sparc64obsd_gregset_supplies_p (struct gdbarch *gdbarch, int regnum)
  33 {
  34   /* Integer registers.  */
  35   if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
  36       || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
  37       || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
  38       || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
  39     return 1;
  40
  41   /* Control registers.  */
  42   if (regnum == SPARC64_PC_REGNUM
  43       || regnum == SPARC64_NPC_REGNUM
  44       || regnum == SPARC64_STATE_REGNUM
  45       || regnum == SPARC64_Y_REGNUM)
  46     return 1;
  47
  48   return 0;
  49 }
  50
  51 /* Determine whether `fpregset_t' contains register REGNUM.  */
  52
  53 static int
  54 sparc64obsd_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum)
  55 {
  56   /* Floating-point registers.  */
  57   if ((regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
  58       || (regnum >= SPARC64_F32_REGNUM && regnum <= SPARC64_F62_REGNUM))
  59     return 1;
  60
  61   /* Control registers.  */
  62   if (regnum == SPARC64_FSR_REGNUM)
  63     return 1;
  64
  65   return 0;
  66 }
  67 \f
  68
  69 /* Support for debugging kernel virtual memory images.  */
  70
  71 #include <sys/types.h>
  72 #include <machine/pcb.h>
  73
  74 #include "bsd-kvm.h"
  75
  76 static int
  77 sparc64obsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
  78 {
  79   u_int64_t state;
  80   int regnum;
  81
  82   /* The following is true for OpenBSD 3.0:
  83
  84      The pcb contains %sp and %pc, %pstate and %cwp.  From this
  85      information we reconstruct the register state as it would look
  86      when we just returned from cpu_switch().  */
  87
  88   /* The stack pointer shouldn't be zero.  */
  89   if (pcb->pcb_sp == 0)
  90     return 0;
  91
  92   /* If the program counter is zero, this is probably a core dump, and
  93      we can get %pc from the stack.  */
  94   if (pcb->pcb_pc == 0)
  95       read_memory(pcb->pcb_sp + BIAS - 176 + (11 * 8),
  96                   (gdb_byte *)&pcb->pcb_pc, sizeof pcb->pcb_pc);
  97
  98   regcache_raw_supply (regcache, SPARC_SP_REGNUM, &pcb->pcb_sp);
  99   regcache_raw_supply (regcache, SPARC64_PC_REGNUM, &pcb->pcb_pc);
 100
 101   state = pcb->pcb_pstate << 8 | pcb->pcb_cwp;
 102   regcache_raw_supply (regcache, SPARC64_STATE_REGNUM, &state);
 103
 104   sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
 105
 106   return 1;
 107 }
 108
 109 void
 110 _initialize_sparc64obsd_nat (void)
 111 {
 112   sparc_supply_gregset = sparc64_supply_gregset;
 113   sparc_collect_gregset = sparc64_collect_gregset;
 114   sparc_supply_fpregset = sparc64_supply_fpregset;
 115   sparc_collect_fpregset = sparc64_collect_fpregset;
 116   sparc_gregset_supplies_p = sparc64obsd_gregset_supplies_p;
 117   sparc_fpregset_supplies_p = sparc64obsd_fpregset_supplies_p;
 118
 119   sparc_gregmap = &sparc64nbsd_gregmap;
 120   sparc_fpregmap = &sparc64_bsd_fpregmap;
 121
 122   /* Add some extra features to the generic SPARC target.  */
 123   obsd_add_target (sparc_target ());
 124
 125   /* Support debugging kernel virtual memory images.  */
 126   bsd_kvm_add_target (sparc64obsd_supply_pcb);
 127 }