gdb/alphabsd-nat.c

   1 /* Native-dependent code for Alpha BSD's.
   2    Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "inferior.h"
  23 #include "regcache.h"
  24
  25 #include "alpha-tdep.h"
  26
  27 #include <sys/types.h>
  28 #include <sys/ptrace.h>
  29 #include <machine/reg.h>
  30
  31 #ifdef HAVE_SYS_PROCFS_H
  32 #include <sys/procfs.h>
  33 #endif
  34
  35 #ifndef HAVE_GREGSET_T
  36 typedef struct reg gregset_t;
  37 #endif
  38
  39 #ifndef HAVE_FPREGSET_T
  40 typedef struct fpreg fpregset_t;
  41 #endif
  42
  43 #include "gregset.h"
  44
  45 /* Number of general-purpose registers.  */
  46 #define NUM_GREGS  32
  47
  48 /* Number of floating point registers.  */
  49 #define NUM_FPREGS 31
  50 \f
  51
  52 /* Transfering the registers between GDB, inferiors and core files.  */
  53
  54 /* Fill GDB's register array with the general-purpose register values
  55    in *GREGSETP.  */
  56
  57 void
  58 supply_gregset (gregset_t *gregsetp)
  59 {
  60   int i;
  61
  62   for (i = 0; i < NUM_GREGS; i++)
  63     {
  64       if (CANNOT_FETCH_REGISTER (i))
  65         supply_register (i, NULL);
  66       else
  67         supply_register (i, (char *) &gregsetp->r_regs[i]);
  68     }
  69
  70   /* The PC travels in the R_ZERO slot.  */
  71   supply_register (PC_REGNUM, (char *) &gregsetp->r_regs[R_ZERO]);
  72 }
  73
  74 /* Fill register REGNO (if it is a general-purpose register) in
  75    *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
  76    do this for all registers.  */
  77
  78 void
  79 fill_gregset (gregset_t *gregsetp, int regno)
  80 {
  81   int i;
  82
  83   for (i = 0; i < NUM_GREGS; i++)
  84     if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
  85       regcache_collect (i, (char *) &gregsetp->r_regs[i]);
  86
  87   /* The PC travels in the R_ZERO slot.  */
  88   if (regno == -1 || regno == PC_REGNUM)
  89     regcache_collect (PC_REGNUM, (char *) &gregsetp->r_regs[R_ZERO]);
  90 }
  91
  92 /* Fill GDB's register array with the floating-point register values
  93    in *FPREGSETP.  */
  94
  95 void
  96 supply_fpregset (fpregset_t *fpregsetp)
  97 {
  98   int i;
  99
 100   for (i = FP0_REGNUM; i < FP0_REGNUM + NUM_FPREGS; i++)
 101     {
 102       if (CANNOT_FETCH_REGISTER (i))
 103         supply_register (i, NULL);
 104       else
 105         supply_register (i, (char *) &fpregsetp->fpr_regs[i - FP0_REGNUM]);
 106     }
 107
 108   supply_register (ALPHA_FPCR_REGNUM, (char *) &fpregsetp->fpr_cr);
 109 }
 110
 111 /* Fill register REGNO (if it is a floating-point register) in
 112    *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
 113    do this for all registers.  */
 114
 115 void
 116 fill_fpregset (fpregset_t *fpregsetp, int regno)
 117 {
 118   int i;
 119
 120   for (i = FP0_REGNUM; i < FP0_REGNUM + NUM_FPREGS; i++)
 121     if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
 122       regcache_collect (i, (char *) &fpregsetp->fpr_regs[i - FP0_REGNUM]);
 123
 124   if (regno == -1 || regno == ALPHA_FPCR_REGNUM)
 125     regcache_collect (ALPHA_FPCR_REGNUM, (char *) &fpregsetp->fpr_cr);
 126 }
 127
 128
 129 /* Determine if PT_GETREGS fetches this register.  */
 130
 131 static int
 132 getregs_supplies (int regno)
 133 {
 134
 135   return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
 136           || regno >= PC_REGNUM);
 137 }
 138
 139
 140 /* Fetch register REGNO from the inferior.  If REGNO is -1, do this
 141    for all registers (including the floating point registers).  */
 142
 143 void
 144 fetch_inferior_registers (int regno)
 145 {
 146
 147   if (regno == -1 || getregs_supplies (regno))
 148     {
 149       gregset_t gregs;
 150
 151       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 152                   (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
 153         perror_with_name ("Couldn't get registers");
 154
 155       supply_gregset (&gregs);
 156       if (regno != -1)
 157         return;
 158     }
 159
 160   if (regno == -1 || regno >= FP0_REGNUM)
 161     {
 162       fpregset_t fpregs;
 163
 164       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 165                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 166         perror_with_name ("Couldn't get floating point status");
 167
 168       supply_fpregset (&fpregs);
 169     }
 170
 171   /* Reset virtual frame pointer.  */
 172   supply_register (FP_REGNUM, NULL);
 173 }
 174
 175 /* Store register REGNO back into the inferior.  If REGNO is -1, do
 176    this for all registers (including the floating point registers).  */
 177
 178 void
 179 store_inferior_registers (int regno)
 180 {
 181
 182   if (regno == -1 || getregs_supplies (regno))
 183     {
 184       gregset_t gregs;
 185       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 186                   (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
 187         perror_with_name ("Couldn't get registers");
 188
 189       fill_gregset (&gregs, regno);
 190
 191       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 192                   (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
 193         perror_with_name ("Couldn't write registers");
 194
 195       if (regno != -1)
 196         return;
 197     }
 198
 199   if (regno == -1 || regno >= FP0_REGNUM)
 200     {
 201       fpregset_t fpregs;
 202
 203       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 204                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 205         perror_with_name ("Couldn't get floating point status");
 206
 207       fill_fpregset (&fpregs, regno);
 208
 209       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 210                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 211         perror_with_name ("Couldn't write floating point status");
 212     }
 213 }