gdb/vaxbsd-nat.c

   1 /* Native-dependent code for modern VAX BSD's.
   2
   3    Copyright (C) 2004-2016 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 "inferior.h"
  22 #include "regcache.h"
  23 #include "target.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/ptrace.h>
  27 #include <machine/reg.h>
  28
  29 #include "vax-tdep.h"
  30 #include "inf-ptrace.h"
  31
  32 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  33
  34 static void
  35 vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs)
  36 {
  37   const gdb_byte *regs = gregs;
  38   int regnum;
  39
  40   for (regnum = 0; regnum < VAX_NUM_REGS; regnum++)
  41     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  42 }
  43
  44 /* Collect the general-purpose registers from REGCACHE and store them
  45    in GREGS.  */
  46
  47 static void
  48 vaxbsd_collect_gregset (const struct regcache *regcache,
  49                         void *gregs, int regnum)
  50 {
  51   gdb_byte *regs = gregs;
  52   int i;
  53
  54   for (i = 0; i <= VAX_NUM_REGS; i++)
  55     {
  56       if (regnum == -1 || regnum == i)
  57         regcache_raw_collect (regcache, i, regs + i * 4);
  58     }
  59 }
  60 \f
  61
  62 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  63    for all registers.  */
  64
  65 static void
  66 vaxbsd_fetch_inferior_registers (struct target_ops *ops,
  67                                  struct regcache *regcache, int regnum)
  68 {
  69   struct reg regs;
  70
  71   if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
  72               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  73     perror_with_name (_("Couldn't get registers"));
  74
  75   vaxbsd_supply_gregset (regcache, &regs);
  76 }
  77
  78 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  79    this for all registers.  */
  80
  81 static void
  82 vaxbsd_store_inferior_registers (struct target_ops *ops,
  83                                  struct regcache *regcache, int regnum)
  84 {
  85   struct reg regs;
  86
  87   if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
  88               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  89     perror_with_name (_("Couldn't get registers"));
  90
  91   vaxbsd_collect_gregset (regcache, &regs, regnum);
  92
  93   if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid),
  94               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  95     perror_with_name (_("Couldn't write registers"));
  96 }
  97 \f
  98
  99 /* Support for debugging kernel virtual memory images.  */
 100
 101 #include <machine/pcb.h>
 102
 103 #include "bsd-kvm.h"
 104
 105 static int
 106 vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 107 {
 108   int regnum;
 109
 110   /* The following is true for OpenBSD 3.5:
 111
 112      The pcb contains the register state at the context switch inside
 113      cpu_switch().  */
 114
 115   /* The stack pointer shouldn't be zero.  */
 116   if (pcb->KSP == 0)
 117     return 0;
 118
 119   for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++)
 120     regcache_raw_supply (regcache, regnum, &pcb->R[regnum - VAX_R0_REGNUM]);
 121   regcache_raw_supply (regcache, VAX_AP_REGNUM, &pcb->AP);
 122   regcache_raw_supply (regcache, VAX_FP_REGNUM, &pcb->FP);
 123   regcache_raw_supply (regcache, VAX_SP_REGNUM, &pcb->KSP);
 124   regcache_raw_supply (regcache, VAX_PC_REGNUM, &pcb->PC);
 125   regcache_raw_supply (regcache, VAX_PS_REGNUM, &pcb->PSL);
 126
 127   return 1;
 128 }
 129 \f
 130
 131 /* Provide a prototype to silence -Wmissing-prototypes.  */
 132 void _initialize_vaxbsd_nat (void);
 133
 134 void
 135 _initialize_vaxbsd_nat (void)
 136 {
 137   struct target_ops *t;
 138
 139   t = inf_ptrace_target ();
 140   t->to_fetch_registers = vaxbsd_fetch_inferior_registers;
 141   t->to_store_registers = vaxbsd_store_inferior_registers;
 142   add_target (t);
 143
 144   /* Support debugging kernel virtual memory images.  */
 145   bsd_kvm_add_target (vaxbsd_supply_pcb);
 146 }