gdb/m32r-linux-nat.c

   1 /* Native-dependent code for GNU/Linux m32r.
   2
   3    Copyright (C) 2004, 2005, 2006 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 "gdbcore.h"
  25 #include "regcache.h"
  26 #include "linux-nat.h"
  27 #include "target.h"
  28
  29 #include "gdb_assert.h"
  30 #include "gdb_string.h"
  31 #include <sys/ptrace.h>
  32 #include <sys/user.h>
  33 #include <sys/procfs.h>
  34
  35 /* Prototypes for supply_gregset etc.  */
  36 #include "gregset.h"
  37
  38 #include "m32r-tdep.h"
  39 \f
  40
  41
  42
  43 /* Since EVB register is not available for native debug, we reduce
  44    the number of registers.  */
  45 #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1)
  46
  47 /* Mapping between the general-purpose registers in `struct user'
  48    format and GDB's register array layout.  */
  49 static int regmap[] = {
  50   4, 5, 6, 7, 0, 1, 2, 8,
  51   9, 10, 11, 12, 13, 24, 25, 23,
  52   19, 19, 26, 23, 22, 20, 16, 15
  53 };
  54
  55 #define PSW_REGMAP 19
  56 #define BBPSW_REGMAP 21
  57 #define SPU_REGMAP 23
  58 #define SPI_REGMAP 26
  59
  60 /* Doee apply to the corresponding SET requests as well.  */
  61 #define GETREGS_SUPPLIES(regno) (0 <= (regno) && (regno) <= M32R_LINUX_NUM_REGS)
  62 \f
  63
  64
  65 /* Transfering the general-purpose registers between GDB, inferiors
  66    and core files.  */
  67
  68 /* Fill GDB's register array with the general-purpose register values
  69    in *GREGSETP.  */
  70
  71 void
  72 supply_gregset (elf_gregset_t * gregsetp)
  73 {
  74   elf_greg_t *regp = (elf_greg_t *) gregsetp;
  75   int i;
  76   unsigned long psw, bbpsw;
  77
  78   psw = *(regp + PSW_REGMAP);
  79   bbpsw = *(regp + BBPSW_REGMAP);
  80
  81   for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
  82     {
  83       switch (i)
  84         {
  85         case PSW_REGNUM:
  86           *(regp + regmap[i]) =
  87             ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8);
  88           break;
  89         case CBR_REGNUM:
  90           *(regp + regmap[i]) = ((psw >> 8) & 1);
  91           break;
  92         }
  93
  94       if (i != M32R_SP_REGNUM)
  95         regcache_raw_supply (current_regcache, i, regp + regmap[i]);
  96       else if (psw & 0x8000)
  97         regcache_raw_supply (current_regcache, i, regp + SPU_REGMAP);
  98       else
  99         regcache_raw_supply (current_regcache, i, regp + SPI_REGMAP);
 100     }
 101 }
 102
 103 /* Fetch all general-purpose registers from process/thread TID and
 104    store their values in GDB's register array.  */
 105
 106 static void
 107 fetch_regs (int tid)
 108 {
 109   elf_gregset_t regs;
 110
 111   if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
 112     perror_with_name (_("Couldn't get registers"));
 113
 114   supply_gregset (&regs);
 115 }
 116
 117 /* Fill register REGNO (if it is a general-purpose register) in
 118    *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
 119    do this for all registers.  */
 120
 121 void
 122 fill_gregset (elf_gregset_t * gregsetp, int regno)
 123 {
 124   elf_greg_t *regp = (elf_greg_t *) gregsetp;
 125   int i;
 126   unsigned long psw, bbpsw, tmp;
 127
 128   psw = *(regp + PSW_REGMAP);
 129   bbpsw = *(regp + BBPSW_REGMAP);
 130
 131   for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
 132     {
 133       if (regno != -1 && regno != i)
 134         continue;
 135
 136       if (i == CBR_REGNUM || i == PSW_REGNUM)
 137         continue;
 138
 139       if (i == SPU_REGNUM || i == SPI_REGNUM)
 140         continue;
 141
 142       if (i != M32R_SP_REGNUM)
 143         regcache_raw_collect (current_regcache, i, regp + regmap[i]);
 144       else if (psw & 0x8000)
 145         regcache_raw_collect (current_regcache, i, regp + SPU_REGMAP);
 146       else
 147         regcache_raw_collect (current_regcache, i, regp + SPI_REGMAP);
 148     }
 149 }
 150
 151 /* Store all valid general-purpose registers in GDB's register array
 152    into the process/thread specified by TID.  */
 153
 154 static void
 155 store_regs (int tid, int regno)
 156 {
 157   elf_gregset_t regs;
 158
 159   if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
 160     perror_with_name (_("Couldn't get registers"));
 161
 162   fill_gregset (&regs, regno);
 163
 164   if (ptrace (PTRACE_SETREGS, tid, 0, (int) &regs) < 0)
 165     perror_with_name (_("Couldn't write registers"));
 166 }
 167 \f
 168
 169
 170 /* Transfering floating-point registers between GDB, inferiors and cores.
 171    Since M32R has no floating-point registers, these functions do nothing.  */
 172
 173 void
 174 supply_fpregset (gdb_fpregset_t *fpregs)
 175 {
 176 }
 177
 178 void
 179 fill_fpregset (gdb_fpregset_t *fpregs, int regno)
 180 {
 181 }
 182 \f
 183
 184
 185 /* Transferring arbitrary registers between GDB and inferior.  */
 186
 187 /* Fetch register REGNO from the child process.  If REGNO is -1, do
 188    this for all registers (including the floating point and SSE
 189    registers).  */
 190
 191 static void
 192 m32r_linux_fetch_inferior_registers (int regno)
 193 {
 194   int tid;
 195
 196   /* GNU/Linux LWP ID's are process ID's.  */
 197   tid = TIDGET (inferior_ptid);
 198   if (tid == 0)
 199     tid = PIDGET (inferior_ptid);       /* Not a threaded program.  */
 200
 201   /* Use the PTRACE_GETREGS request whenever possible, since it
 202      transfers more registers in one system call, and we'll cache the
 203      results.  */
 204   if (regno == -1 || GETREGS_SUPPLIES (regno))
 205     {
 206       fetch_regs (tid);
 207       return;
 208     }
 209
 210   internal_error (__FILE__, __LINE__,
 211                   _("Got request for bad register number %d."), regno);
 212 }
 213
 214 /* Store register REGNO back into the child process.  If REGNO is -1,
 215    do this for all registers (including the floating point and SSE
 216    registers).  */
 217 static void
 218 m32r_linux_store_inferior_registers (int regno)
 219 {
 220   int tid;
 221
 222   /* GNU/Linux LWP ID's are process ID's.  */
 223   if ((tid = TIDGET (inferior_ptid)) == 0)
 224     tid = PIDGET (inferior_ptid);       /* Not a threaded program.  */
 225
 226   /* Use the PTRACE_SETREGS request whenever possible, since it
 227      transfers more registers in one system call.  */
 228   if (regno == -1 || GETREGS_SUPPLIES (regno))
 229     {
 230       store_regs (tid, regno);
 231       return;
 232     }
 233
 234   internal_error (__FILE__, __LINE__,
 235                   _("Got request to store bad register number %d."), regno);
 236 }
 237
 238 void _initialize_m32r_linux_nat (void);
 239
 240 void
 241 _initialize_m32r_linux_nat (void)
 242 {
 243   struct target_ops *t;
 244
 245   /* Fill in the generic GNU/Linux methods.  */
 246   t = linux_target ();
 247
 248   /* Add our register access methods.  */
 249   t->to_fetch_registers = m32r_linux_fetch_inferior_registers;
 250   t->to_store_registers = m32r_linux_store_inferior_registers;
 251
 252   /* Register the target.  */
 253   linux_nat_add_target (t);
 254 }