gnu/dist/gdb6/gdb/vaxbsd-nat.c

   1 /* Native-dependent code for modern VAX BSD's.
   2
   3    Copyright (C) 2004, 2005 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., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, 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 #include "nbsd-nat.h"
  35
  36 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  37
  38 static void
  39 vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs)
  40 {
  41   const gdb_byte *regs = gregs;
  42   int regnum;
  43
  44   for (regnum = 0; regnum < VAX_NUM_REGS; regnum++)
  45     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  46 }
  47
  48 /* Collect the general-purpose registers from REGCACHE and store them
  49    in GREGS.  */
  50
  51 static void
  52 vaxbsd_collect_gregset (const struct regcache *regcache,
  53                         void *gregs, int regnum)
  54 {
  55   gdb_byte *regs = gregs;
  56   int i;
  57
  58   for (i = 0; i <= VAX_NUM_REGS; i++)
  59     {
  60       if (regnum == -1 || regnum == i)
  61         regcache_raw_collect (regcache, i, regs + i * 4);
  62     }
  63 }
  64 \f
  65
  66 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  67    for all registers.  */
  68
  69 static void
  70 vaxbsd_fetch_inferior_registers (int regnum)
  71 {
  72   struct reg regs;
  73
  74   if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  75               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  76     perror_with_name (_("Couldn't get registers"));
  77
  78   vaxbsd_supply_gregset (current_regcache, &regs);
  79 }
  80
  81 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  82    this for all registers.  */
  83
  84 static void
  85 vaxbsd_store_inferior_registers (int regnum)
  86 {
  87   struct reg regs;
  88
  89   if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  90               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  91     perror_with_name (_("Couldn't get registers"));
  92
  93   vaxbsd_collect_gregset (current_regcache, &regs, regnum);
  94
  95   if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
  96               (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  97     perror_with_name (_("Couldn't write registers"));
  98 }
  99 \f
 100
 101 /* Support for debugging kernel virtual memory images.  */
 102
 103 #include <sys/types.h>
 104 #include <machine/pcb.h>
 105
 106 #include "bsd-kvm.h"
 107
 108 static int
 109 vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 110 {
 111   int regnum;
 112
 113   /* The following is true for OpenBSD 3.5:
 114
 115      The pcb contains the register state at the context switch inside
 116      cpu_switch().  */
 117
 118   /* The stack pointer shouldn't be zero.  */
 119   if (pcb->KSP == 0)
 120     return 0;
 121
 122   for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++)
 123     regcache_raw_supply (regcache, regnum, &pcb->R[regnum - VAX_R0_REGNUM]);
 124   regcache_raw_supply (regcache, VAX_AP_REGNUM, &pcb->AP);
 125   regcache_raw_supply (regcache, VAX_FP_REGNUM, &pcb->FP);
 126   regcache_raw_supply (regcache, VAX_SP_REGNUM, &pcb->KSP);
 127   regcache_raw_supply (regcache, VAX_PC_REGNUM, &pcb->PC);
 128   regcache_raw_supply (regcache, VAX_PS_REGNUM, &pcb->PSL);
 129
 130   return 1;
 131 }
 132 \f
 133
 134 /* Provide a prototype to silence -Wmissing-prototypes.  */
 135 void _initialize_vaxbsd_nat (void);
 136
 137 void
 138 _initialize_vaxbsd_nat (void)
 139 {
 140   struct target_ops *t;
 141
 142   /* Add some extra features to the common *BSD/vax target.  */
 143   t = inf_ptrace_target ();
 144   t->to_fetch_registers = vaxbsd_fetch_inferior_registers;
 145   t->to_store_registers = vaxbsd_store_inferior_registers;
 146   t->to_pid_to_exec_file = nbsd_pid_to_exec_file;
 147   add_target (t);
 148
 149   /* Support debugging kernel virtual memory images.  */
 150   bsd_kvm_add_target (vaxbsd_supply_pcb);
 151 }