gdb/m68kbsd-nat.c

   1 /* Native-dependent code for Motorola 68000 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
  26 #include "gdb_assert.h"
  27 #include <sys/types.h>
  28 #include <sys/ptrace.h>
  29 #include <machine/reg.h>
  30
  31 #include "m68k-tdep.h"
  32
  33 static int
  34 m68kbsd_gregset_supplies_p (int regnum)
  35 {
  36   return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM);
  37 }
  38
  39 static int
  40 m68kbsd_fpregset_supplies_p (int regnum)
  41 {
  42   return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM);
  43 }
  44
  45 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  46
  47 static void
  48 m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs)
  49 {
  50   const char *regs = gregs;
  51   int regnum;
  52
  53   for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++)
  54     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  55 }
  56
  57 /* Supply the floating-point registers stored in FPREGS to REGCACHE.  */
  58
  59 static void
  60 m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
  61 {
  62   const char *regs = fpregs;
  63   int regnum;
  64
  65   for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++)
  66     regcache_raw_supply (regcache, regnum,
  67                          regs + m68kbsd_fpreg_offset (regnum));
  68 }
  69
  70 /* Collect the general-purpose registers from REGCACHE and store them
  71    in GREGS.  */
  72
  73 static void
  74 m68kbsd_collect_gregset (const struct regcache *regcache,
  75                          void *gregs, int regnum)
  76 {
  77   char *regs = gregs;
  78   int i;
  79
  80   for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
  81     {
  82       if (regnum == -1 || regnum == i)
  83         regcache_raw_collect (regcache, regnum, regs + i * 4);
  84     }
  85 }
  86
  87 /* Collect the floating-point registers from REGCACHE and store them
  88    in FPREGS.  */
  89
  90 static void
  91 m68kbsd_collect_fpregset (struct regcache *regcache,
  92                           void *fpregs, int regnum)
  93 {
  94   char *regs = fpregs;
  95   int i;
  96
  97   for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++)
  98     {
  99       if (regnum == -1 || regnum == i)
 100         regcache_raw_collect (regcache, regnum,
 101                               regs + m68kbsd_fpreg_offset (i));
 102     }
 103 }
 104 \f
 105
 106 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
 107    for all registers (including the floating-point registers).  */
 108
 109 void
 110 fetch_inferior_registers (int regnum)
 111 {
 112   if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
 113     {
 114       struct reg regs;
 115
 116       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 117                   (PTRACE_ARG3_TYPE) &regs, 0) == -1)
 118         perror_with_name ("Couldn't get registers");
 119
 120       m68kbsd_supply_gregset (current_regcache, &regs);
 121     }
 122
 123   if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
 124     {
 125       struct fpreg fpregs;
 126
 127       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 128                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 129         perror_with_name ("Couldn't get floating point status");
 130
 131       m68kbsd_supply_fpregset (current_regcache, &fpregs);
 132     }
 133 }
 134
 135 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
 136    this for all registers (including the floating-point registers).  */
 137
 138 void
 139 store_inferior_registers (int regnum)
 140 {
 141   if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
 142     {
 143       struct reg regs;
 144
 145       if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
 146                   (PTRACE_ARG3_TYPE) &regs, 0) == -1)
 147         perror_with_name ("Couldn't get registers");
 148
 149       m68kbsd_collect_gregset (current_regcache, &regs, regnum);
 150
 151       if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
 152                   (PTRACE_ARG3_TYPE) &regs, 0) == -1)
 153         perror_with_name ("Couldn't write registers");
 154     }
 155
 156   if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
 157     {
 158       struct fpreg fpregs;
 159
 160       if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
 161                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 162         perror_with_name ("Couldn't get floating point status");
 163
 164       m68kbsd_collect_fpregset (current_regcache, &fpregs, regnum);
 165
 166       if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
 167                   (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
 168         perror_with_name ("Couldn't write floating point status");
 169     }
 170 }