gdb/remote-vxmips.c

   1 /* MIPS-dependent portions of the RPC protocol
   2    used with a VxWorks target
   3
   4    Contributed by Wind River Systems.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include <stdio.h>
  24 #include "defs.h"
  25
  26 #include "vx-share/regPacket.h"
  27 #include "frame.h"
  28 #include "inferior.h"
  29 #include "target.h"
  30 #include "gdbcore.h"
  31 #include "command.h"
  32 #include "symtab.h"
  33 #include "symfile.h"
  34 #include "regcache.h"
  35
  36 #include "gdb_string.h"
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <sys/types.h>
  40 #include <sys/time.h>
  41 #include <sys/socket.h>
  42 #include <rpc/rpc.h>
  43 #include <sys/time.h>           /* UTek's <rpc/rpc.h> doesn't #incl this */
  44 #include <netdb.h>
  45 #include "vx-share/ptrace.h"
  46 #include "vx-share/xdr_ptrace.h"
  47 #include "vx-share/xdr_ld.h"
  48 #include "vx-share/xdr_rdb.h"
  49 #include "vx-share/dbgRpcLib.h"
  50
  51 /* get rid of value.h if possible */
  52 #include <value.h>
  53 #include <symtab.h>
  54
  55 /* Flag set if target has fpu */
  56
  57 extern int target_has_fp;
  58
  59 /* Generic register read/write routines in remote-vx.c.  */
  60
  61 extern void net_read_registers ();
  62 extern void net_write_registers ();
  63
  64 /* Read a register or registers from the VxWorks target.
  65    REGNO is the register to read, or -1 for all; currently,
  66    it is ignored.  FIXME look at regno to improve efficiency.  */
  67
  68 void
  69 vx_read_register (int regno)
  70 {
  71   char mips_greg_packet[MIPS_GREG_PLEN];
  72   char mips_fpreg_packet[MIPS_FPREG_PLEN];
  73
  74   /* Get general-purpose registers.  */
  75
  76   net_read_registers (mips_greg_packet, MIPS_GREG_PLEN, PTRACE_GETREGS);
  77
  78   /* this code copies the registers obtained by RPC
  79      stored in a structure(s) like this :
  80
  81      Register(s)                Offset(s)
  82      gp 0-31                    0x00
  83      hi                 0x80
  84      lo                 0x84
  85      sr                 0x88
  86      pc                 0x8c
  87
  88      into a stucture like this:
  89
  90      0x00       GP 0-31
  91      0x80       SR
  92      0x84       LO
  93      0x88       HI
  94      0x8C       BAD             --- Not available currently
  95      0x90       CAUSE           --- Not available currently
  96      0x94       PC
  97      0x98       FP 0-31
  98      0x118      FCSR
  99      0x11C      FIR             --- Not available currently
 100      0x120      FP              --- Not available currently
 101
 102      structure is 0x124 (292) bytes in length */
 103
 104   /* Copy the general registers.  */
 105
 106   memcpy (&deprecated_registers[0], &mips_greg_packet[MIPS_R_GP0],
 107           32 * MIPS_GREG_SIZE);
 108
 109   /* Copy SR, LO, HI, and PC.  */
 110
 111   memcpy (&deprecated_registers[DEPRECATED_REGISTER_BYTE (MIPS_PS_REGNUM)],
 112           &mips_greg_packet[MIPS_R_SR],
 113           MIPS_GREG_SIZE);
 114   memcpy (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->lo)],
 115           &mips_greg_packet[MIPS_R_LO],
 116           MIPS_GREG_SIZE);
 117   memcpy (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->hi)],
 118           &mips_greg_packet[MIPS_R_HI],
 119           MIPS_GREG_SIZE);
 120   memcpy (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->pc)],
 121           &mips_greg_packet[MIPS_R_PC],
 122           MIPS_GREG_SIZE);
 123
 124   /* If the target has floating point registers, fetch them.
 125      Otherwise, zero the floating point register values in
 126      registers[] for good measure, even though we might not
 127      need to.  */
 128
 129   if (target_has_fp)
 130     {
 131       net_read_registers (mips_fpreg_packet, MIPS_FPREG_PLEN,
 132                           PTRACE_GETFPREGS);
 133
 134       /* Copy the floating point registers.  */
 135
 136       memcpy (&deprecated_registers[DEPRECATED_REGISTER_BYTE (FP0_REGNUM)],
 137               &mips_fpreg_packet[MIPS_R_FP0],
 138               register_size (current_gdbarch, FP0_REGNUM) * 32);
 139
 140       /* Copy the floating point control/status register (fpcsr).  */
 141
 142       memcpy (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->fp_control_status)],
 143               &mips_fpreg_packet[MIPS_R_FPCSR],
 144               register_size (current_gdbarch, mips_regnum (current_gdbarch)->fp_control_status));
 145     }
 146   else
 147     {
 148       memset (&deprecated_registers[DEPRECATED_REGISTER_BYTE (FP0_REGNUM)],
 149               0, register_size (current_gdbarch, FP0_REGNUM) * 32);
 150       memset (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->fp_control_status)],
 151               0, register_size (current_gdbarch, mips_regnum (current_gdbarch)->fp_control_status));
 152     }
 153
 154   /* Mark the register cache valid.  */
 155
 156   deprecated_registers_fetched ();
 157 }
 158
 159 /* Store a register or registers into the VxWorks target.
 160    REGNO is the register to store, or -1 for all; currently,
 161    it is ignored.  FIXME look at regno to improve efficiency.  */
 162
 163 vx_write_register (int regno)
 164 {
 165   char mips_greg_packet[MIPS_GREG_PLEN];
 166   char mips_fpreg_packet[MIPS_FPREG_PLEN];
 167
 168   /* Store general registers.  */
 169
 170   memcpy (&mips_greg_packet[MIPS_R_GP0], &deprecated_registers[0],
 171           32 * MIPS_GREG_SIZE);
 172
 173   /* Copy SR, LO, HI, and PC.  */
 174
 175   memcpy (&mips_greg_packet[MIPS_R_SR],
 176           &deprecated_registers[DEPRECATED_REGISTER_BYTE (MIPS_PS_REGNUM)],
 177           MIPS_GREG_SIZE);
 178   memcpy (&mips_greg_packet[MIPS_R_LO],
 179           &deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->lo)],
 180           MIPS_GREG_SIZE);
 181   memcpy (&mips_greg_packet[MIPS_R_HI],
 182           &deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->hi)],
 183           MIPS_GREG_SIZE);
 184   memcpy (&mips_greg_packet[MIPS_R_PC],
 185           &deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->pc)],
 186           MIPS_GREG_SIZE);
 187
 188   net_write_registers (mips_greg_packet, MIPS_GREG_PLEN, PTRACE_SETREGS);
 189
 190   /* Store floating point registers if the target has them.  */
 191
 192   if (target_has_fp)
 193     {
 194       /* Copy the floating point data registers.  */
 195
 196       memcpy (&mips_fpreg_packet[MIPS_R_FP0],
 197               &deprecated_registers[DEPRECATED_REGISTER_BYTE (FP0_REGNUM)],
 198               register_size (current_gdbarch, FP0_REGNUM) * 32);
 199
 200       /* Copy the floating point control/status register (fpcsr).  */
 201
 202       memcpy (&mips_fpreg_packet[MIPS_R_FPCSR],
 203               &deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->fp_control_status)],
 204               register_size (current_gdbarch, mips_regnum (current_gdbarch)->fp_control_status));
 205
 206       net_write_registers (mips_fpreg_packet, MIPS_FPREG_PLEN,
 207                            PTRACE_SETFPREGS);
 208     }
 209 }