gdb/vaxbsd-nat.c

   1 /* Native-dependent code for modern VAX BSD's.
   2
   3    Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "inferior.h"
  23 #include "regcache.h"
  24 #include "target.h"
  25
  26 #include <sys/types.h>
  27 #include <sys/ptrace.h>
  28 #include <machine/reg.h>
  29
  30 #include "vax-tdep.h"
  31 #include "inf-ptrace.h"
  32
  33 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  34
  35 static void
  36 vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs)
  37 {
  38   const gdb_byte *regs = gregs;
  39   int regnum;
  40
  41   for (regnum = 0; regnum < VAX_NUM_REGS; regnum++)
  42     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  43 }
  44
  45 /* Collect the general-purpose registers from REGCACHE and store them
  46    in GREGS.  */
  47
  48 static void
  49 vaxbsd_collect_gregset (const struct regcache *regcache,
  50                         void *gregs, int regnum)
  51 {
  52   gdb_byte *regs = gregs;
  53   int i;
  54
  55   for (i = 0; i <= VAX_NUM_REGS; i++)
  56     {
  57       if (regnum == -1 || regnum == i)
  58         regcache_raw_collect (regcache, i, regs + i * 4);
  59     }
  60 }
  61 \f
  62
  63 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  64    for all registers.  */
  65
  66 static void
  67 vaxbsd_fetch_inferior_registers (struct target_ops *ops,
  68                                  struct regcache *regcache, int regnum)
  69 {
  70   struct reg regs;
  71
  72   if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  73               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  74     perror_with_name (_("Couldn't get registers"));
  75
  76   vaxbsd_supply_gregset (regcache, &regs);
  77 }
  78
  79 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  80    this for all registers.  */
  81
  82 static void
  83 vaxbsd_store_inferior_registers (struct target_ops *ops,
  84                                  struct regcache *regcache, int regnum)
  85 {
  86   struct reg regs;
  87
  88   if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  89               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  90     perror_with_name (_("Couldn't get registers"));
  91
  92   vaxbsd_collect_gregset (regcache, &regs, regnum);
  93
  94   if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
  95               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  96     perror_with_name (_("Couldn't write registers"));
  97 }
  98 \f
  99
 100 /* Support for debugging kernel virtual memory images.  */
 101
 102 #include <sys/types.h>
 103 #include <machine/pcb.h>
 104
 105 #include "bsd-kvm.h"
 106
 107 static int
 108 vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 109 {
 110   int regnum;
 111
 112   /* The following is true for OpenBSD 3.5:
 113
 114      The pcb contains the register state at the context switch inside
 115      cpu_switch().  */
 116
 117   /* The stack pointer shouldn't be zero.  */
 118   if (pcb->KSP == 0)
 119     return 0;
 120
 121   for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++)
 122     regcache_raw_supply (regcache, regnum, &pcb->R[regnum - VAX_R0_REGNUM]);
 123   regcache_raw_supply (regcache, VAX_AP_REGNUM, &pcb->AP);
 124   regcache_raw_supply (regcache, VAX_FP_REGNUM, &pcb->FP);
 125   regcache_raw_supply (regcache, VAX_SP_REGNUM, &pcb->KSP);
 126   regcache_raw_supply (regcache, VAX_PC_REGNUM, &pcb->PC);
 127   regcache_raw_supply (regcache, VAX_PS_REGNUM, &pcb->PSL);
 128
 129   return 1;
 130 }
 131 \f
 132
 133 /* Provide a prototype to silence -Wmissing-prototypes.  */
 134 void _initialize_vaxbsd_nat (void);
 135
 136 void
 137 _initialize_vaxbsd_nat (void)
 138 {
 139   struct target_ops *t;
 140
 141   t = inf_ptrace_target ();
 142   t->to_fetch_registers = vaxbsd_fetch_inferior_registers;
 143   t->to_store_registers = vaxbsd_store_inferior_registers;
 144   add_target (t);
 145
 146   /* Support debugging kernel virtual memory images.  */
 147   bsd_kvm_add_target (vaxbsd_supply_pcb);
 148 }