gnu/dist/gdb6/gdb/m68kbsd-nat.c

   1 /* Native-dependent code for Motorola 68000 BSD's.
   2
   3    Copyright (C) 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., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "defs.h"
  23 #include "gdbcore.h"
  24 #include "inferior.h"
  25 #include "regcache.h"
  26
  27 #include "gdb_assert.h"
  28 #include <sys/types.h>
  29 #include <sys/ptrace.h>
  30 #include <machine/reg.h>
  31
  32 #include "m68k-tdep.h"
  33 #include "inf-ptrace.h"
  34
  35 #include "nbsd-nat.h"
  36
  37 static int
  38 m68kbsd_gregset_supplies_p (int regnum)
  39 {
  40   return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM);
  41 }
  42
  43 static int
  44 m68kbsd_fpregset_supplies_p (int regnum)
  45 {
  46   return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM);
  47 }
  48
  49 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  50
  51 static void
  52 m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs)
  53 {
  54   const char *regs = gregs;
  55   int regnum;
  56
  57   for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++)
  58     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  59 }
  60
  61 /* Supply the floating-point registers stored in FPREGS to REGCACHE.  */
  62
  63 static void
  64 m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
  65 {
  66   const char *regs = fpregs;
  67   int regnum;
  68
  69   for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++)
  70     regcache_raw_supply (regcache, regnum,
  71                          regs + m68kbsd_fpreg_offset (regnum));
  72 }
  73
  74 /* Collect the general-purpose registers from REGCACHE and store them
  75    in GREGS.  */
  76
  77 static void
  78 m68kbsd_collect_gregset (const struct regcache *regcache,
  79                          void *gregs, int regnum)
  80 {
  81   char *regs = gregs;
  82   int i;
  83
  84   for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
  85     {
  86       if (regnum == -1 || regnum == i)
  87         regcache_raw_collect (regcache, i, regs + i * 4);
  88     }
  89 }
  90
  91 /* Collect the floating-point registers from REGCACHE and store them
  92    in FPREGS.  */
  93
  94 static void
  95 m68kbsd_collect_fpregset (struct regcache *regcache,
  96                           void *fpregs, int regnum)
  97 {
  98   char *regs = fpregs;
  99   int i;
 100
 101   for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++)
 102     {
 103       if (regnum == -1 || regnum == i)
 104         regcache_raw_collect (regcache, i, regs + m68kbsd_fpreg_offset (i));
 105     }
 106 }
 107 \f
 108
 109 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
 110    for all registers (including the floating-point registers).  */
 111
 112 static void
 113 m68kbsd_fetch_inferior_registers (int regnum)
 114 {
 115   if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
 116     {
 117       struct reg regs;
 118
 119       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 120                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 121         perror_with_name (_("Couldn't get registers"));
 122
 123       m68kbsd_supply_gregset (current_regcache, &regs);
 124     }
 125
 126   if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
 127     {
 128       struct fpreg fpregs;
 129
 130       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 131                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 132         perror_with_name (_("Couldn't get floating point status"));
 133
 134       m68kbsd_supply_fpregset (current_regcache, &fpregs);
 135     }
 136 }
 137
 138 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 139    this for all registers (including the floating-point registers).  */
 140
 141 static void
 142 m68kbsd_store_inferior_registers (int regnum)
 143 {
 144   if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
 145     {
 146       struct reg regs;
 147
 148       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 149                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 150         perror_with_name (_("Couldn't get registers"));
 151
 152       m68kbsd_collect_gregset (current_regcache, &regs, regnum);
 153
 154       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 155                   (PTRACE_TYPE_ARG3) &regs, 0) == -1)
 156         perror_with_name (_("Couldn't write registers"));
 157     }
 158
 159   if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
 160     {
 161       struct fpreg fpregs;
 162
 163       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 164                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 165         perror_with_name (_("Couldn't get floating point status"));
 166
 167       m68kbsd_collect_fpregset (current_regcache, &fpregs, regnum);
 168
 169       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 170                   (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
 171         perror_with_name (_("Couldn't write floating point status"));
 172     }
 173 }
 174 \f
 175
 176 /* Support for debugging kernel virtual memory images.  */
 177
 178 #include <sys/types.h>
 179 #include <machine/pcb.h>
 180
 181 #include "bsd-kvm.h"
 182
 183 /* OpenBSD doesn't have these.  */
 184 #ifndef PCB_REGS_FP
 185 #define PCB_REGS_FP 10
 186 #endif
 187 #ifndef PCB_REGS_SP
 188 #define PCB_REGS_SP 11
 189 #endif
 190
 191 static int
 192 m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 193 {
 194   int regnum, tmp;
 195   int i = 0;
 196
 197   /* The following is true for NetBSD 1.6.2:
 198
 199      The pcb contains %d2...%d7, %a2...%a7 and %ps.  This accounts for
 200      all callee-saved registers.  From this information we reconstruct
 201      the register state as it would look when we just returned from
 202      cpu_switch().  */
 203
 204   /* The stack pointer shouldn't be zero.  */
 205   if (pcb->pcb_regs[PCB_REGS_SP] == 0)
 206     return 0;
 207
 208   for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++)
 209     regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]);
 210   for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++)
 211     regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]);
 212
 213   tmp = pcb->pcb_ps & 0xffff;
 214   regcache_raw_supply (regcache, M68K_PS_REGNUM, &tmp);
 215
 216   read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (char *) &tmp, sizeof tmp);
 217   regcache_raw_supply (regcache, M68K_PC_REGNUM, &tmp);
 218
 219   return 1;
 220 }
 221 \f
 222
 223 /* Provide a prototype to silence -Wmissing-prototypes.  */
 224 void _initialize_m68kbsd_nat (void);
 225
 226 void
 227 _initialize_m68kbsd_nat (void)
 228 {
 229   struct target_ops *t;
 230
 231   t = inf_ptrace_target ();
 232   t->to_fetch_registers = m68kbsd_fetch_inferior_registers;
 233   t->to_store_registers = m68kbsd_store_inferior_registers;
 234
 235   t->to_pid_to_exec_file = nbsd_pid_to_exec_file;
 236
 237   add_target (t);
 238
 239   /* Support debugging kernel virtual memory images.  */
 240   bsd_kvm_add_target (m68kbsd_supply_pcb);
 241 }