gdb/vaxbsd-nat.c

   1 /* Native-dependent code for modern VAX BSD's.
   2
   3    Copyright 2004 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 2 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, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "inferior.h"
  24 #include "regcache.h"
  25 #include "target.h"
  26
  27 #include <sys/types.h>
  28 #include <sys/ptrace.h>
  29 #include <machine/reg.h>
  30
  31 #include "vax-tdep.h"
  32 #include "inf-ptrace.h"
  33
  34 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  35
  36 static void
  37 vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs)
  38 {
  39   const char *regs = gregs;
  40   int regnum;
  41
  42   for (regnum = 0; regnum < VAX_NUM_REGS; regnum++)
  43     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  44 }
  45
  46 /* Collect the general-purpose registers from REGCACHE and store them
  47    in GREGS.  */
  48
  49 static void
  50 vaxbsd_collect_gregset (const struct regcache *regcache,
  51                         void *gregs, int regnum)
  52 {
  53   char *regs = gregs;
  54   int i;
  55
  56   for (i = 0; i <= VAX_NUM_REGS; i++)
  57     {
  58       if (regnum == -1 || regnum == i)
  59         regcache_raw_collect (regcache, i, regs + i * 4);
  60     }
  61 }
  62 \f
  63
  64 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  65    for all registers.  */
  66
  67 static void
  68 vaxbsd_fetch_inferior_registers (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 (current_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 (int regnum)
  84 {
  85   struct reg regs;
  86
  87   if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  88               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  89     perror_with_name (_("Couldn't get registers"));
  90
  91   vaxbsd_collect_gregset (current_regcache, &regs, regnum);
  92
  93   if (ptrace (PT_SETREGS, PIDGET (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 <sys/types.h>
 102 #include <machine/pcb.h>
 103
 104 #include "bsd-kvm.h"
 105
 106 static int
 107 vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 108 {
 109   int regnum;
 110
 111   /* The following is true for OpenBSD 3.5:
 112
 113      The pcb contains the register state at the context switch inside
 114      cpu_switch().  */
 115
 116   /* The stack pointer shouldn't be zero.  */
 117   if (pcb->KSP == 0)
 118     return 0;
 119
 120   for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++)
 121     regcache_raw_supply (regcache, regnum, &pcb->R[regnum - VAX_R0_REGNUM]);
 122   regcache_raw_supply (regcache, VAX_AP_REGNUM, &pcb->AP);
 123   regcache_raw_supply (regcache, VAX_FP_REGNUM, &pcb->FP);
 124   regcache_raw_supply (regcache, VAX_SP_REGNUM, &pcb->KSP);
 125   regcache_raw_supply (regcache, VAX_PC_REGNUM, &pcb->PC);
 126   regcache_raw_supply (regcache, VAX_PS_REGNUM, &pcb->PSL);
 127
 128   return 1;
 129 }
 130 \f
 131
 132 /* Provide a prototype to silence -Wmissing-prototypes.  */
 133 void _initialize_vaxbsd_nat (void);
 134
 135 void
 136 _initialize_vaxbsd_nat (void)
 137 {
 138   struct target_ops *t;
 139
 140   t = inf_ptrace_target ();
 141   t->to_fetch_registers = vaxbsd_fetch_inferior_registers;
 142   t->to_store_registers = vaxbsd_store_inferior_registers;
 143   add_target (t);
 144
 145   /* Support debugging kernel virtual memory images.  */
 146   bsd_kvm_add_target (vaxbsd_supply_pcb);
 147 }