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 "wait.h"
  30 #include "target.h"
  31 #include "gdbcore.h"
  32 #include "command.h"
  33 #include "symtab.h"
  34 #include "symfile.h"            /* for struct complaint */
  35
  36 #include "gdb_string.h"
  37 #include <errno.h>
  38 #include <signal.h>
  39 #include <fcntl.h>
  40 #include <sys/types.h>
  41 #include <sys/time.h>
  42 #include <sys/socket.h>
  43 #include <rpc/rpc.h>
  44 #include <sys/time.h>           /* UTek's <rpc/rpc.h> doesn't #incl this */
  45 #include <netdb.h>
  46 #include "vx-share/ptrace.h"
  47 #include "vx-share/xdr_ptrace.h"
  48 #include "vx-share/xdr_ld.h"
  49 #include "vx-share/xdr_rdb.h"
  50 #include "vx-share/dbgRpcLib.h"
  51
  52 /* get rid of value.h if possible */
  53 #include <value.h>
  54 #include <symtab.h>
  55
  56 /* Flag set if target has fpu */
  57
  58 extern int target_has_fp;
  59
  60 /* Generic register read/write routines in remote-vx.c.  */
  61
  62 extern void net_read_registers ();
  63 extern void net_write_registers ();
  64
  65 /* Read a register or registers from the VxWorks target.
  66    REGNO is the register to read, or -1 for all; currently,
  67    it is ignored.  FIXME look at regno to improve efficiency.  */
  68
  69 void
  70 vx_read_register (regno)
  71      int regno;
  72 {
  73   char mips_greg_packet[MIPS_GREG_PLEN];
  74   char mips_fpreg_packet[MIPS_FPREG_PLEN];
  75
  76   /* Get general-purpose registers.  */
  77
  78   net_read_registers (mips_greg_packet, MIPS_GREG_PLEN, PTRACE_GETREGS);
  79
  80   /* this code copies the registers obtained by RPC
  81      stored in a structure(s) like this :
  82
  83      Register(s)                Offset(s)
  84      gp 0-31                    0x00
  85      hi                 0x80
  86      lo                 0x84
  87      sr                 0x88
  88      pc                 0x8c
  89
  90      into a stucture like this:
  91
  92      0x00       GP 0-31
  93      0x80       SR
  94      0x84       LO
  95      0x88       HI
  96      0x8C       BAD             --- Not available currently
  97      0x90       CAUSE           --- Not available currently
  98      0x94       PC
  99      0x98       FP 0-31
 100      0x118      FCSR
 101      0x11C      FIR             --- Not available currently
 102      0x120      FP              --- Not available currently
 103
 104      structure is 0x124 (292) bytes in length */
 105
 106   /* Copy the general registers.  */
 107
 108   bcopy (&mips_greg_packet[MIPS_R_GP0], &registers[0], 32 * MIPS_GREG_SIZE);
 109
 110   /* Copy SR, LO, HI, and PC.  */
 111
 112   bcopy (&mips_greg_packet[MIPS_R_SR],
 113          &registers[REGISTER_BYTE (PS_REGNUM)], MIPS_GREG_SIZE);
 114   bcopy (&mips_greg_packet[MIPS_R_LO],
 115          &registers[REGISTER_BYTE (LO_REGNUM)], MIPS_GREG_SIZE);
 116   bcopy (&mips_greg_packet[MIPS_R_HI],
 117          &registers[REGISTER_BYTE (HI_REGNUM)], MIPS_GREG_SIZE);
 118   bcopy (&mips_greg_packet[MIPS_R_PC],
 119          &registers[REGISTER_BYTE (PC_REGNUM)], MIPS_GREG_SIZE);
 120
 121   /* If the target has floating point registers, fetch them.
 122      Otherwise, zero the floating point register values in
 123      registers[] for good measure, even though we might not
 124      need to.  */
 125
 126   if (target_has_fp)
 127     {
 128       net_read_registers (mips_fpreg_packet, MIPS_FPREG_PLEN,
 129                           PTRACE_GETFPREGS);
 130
 131       /* Copy the floating point registers.  */
 132
 133       bcopy (&mips_fpreg_packet[MIPS_R_FP0],
 134              &registers[REGISTER_BYTE (FP0_REGNUM)],
 135              REGISTER_RAW_SIZE (FP0_REGNUM) * 32);
 136
 137       /* Copy the floating point control/status register (fpcsr).  */
 138
 139       bcopy (&mips_fpreg_packet[MIPS_R_FPCSR],
 140              &registers[REGISTER_BYTE (FCRCS_REGNUM)],
 141              REGISTER_RAW_SIZE (FCRCS_REGNUM));
 142     }
 143   else
 144     {
 145       bzero ((char *) &registers[REGISTER_BYTE (FP0_REGNUM)],
 146              REGISTER_RAW_SIZE (FP0_REGNUM) * 32);
 147       bzero ((char *) &registers[REGISTER_BYTE (FCRCS_REGNUM)],
 148              REGISTER_RAW_SIZE (FCRCS_REGNUM));
 149     }
 150
 151   /* Mark the register cache valid.  */
 152
 153   registers_fetched ();
 154 }
 155
 156 /* Store a register or registers into the VxWorks target.
 157    REGNO is the register to store, or -1 for all; currently,
 158    it is ignored.  FIXME look at regno to improve efficiency.  */
 159
 160 vx_write_register (regno)
 161      int regno;
 162 {
 163   char mips_greg_packet[MIPS_GREG_PLEN];
 164   char mips_fpreg_packet[MIPS_FPREG_PLEN];
 165
 166   /* Store general registers.  */
 167
 168   bcopy (&registers[0], &mips_greg_packet[MIPS_R_GP0], 32 * MIPS_GREG_SIZE);
 169
 170   /* Copy SR, LO, HI, and PC.  */
 171
 172   bcopy (&registers[REGISTER_BYTE (PS_REGNUM)],
 173          &mips_greg_packet[MIPS_R_SR], MIPS_GREG_SIZE);
 174   bcopy (&registers[REGISTER_BYTE (LO_REGNUM)],
 175          &mips_greg_packet[MIPS_R_LO], MIPS_GREG_SIZE);
 176   bcopy (&registers[REGISTER_BYTE (HI_REGNUM)],
 177          &mips_greg_packet[MIPS_R_HI], MIPS_GREG_SIZE);
 178   bcopy (&registers[REGISTER_BYTE (PC_REGNUM)],
 179          &mips_greg_packet[MIPS_R_PC], MIPS_GREG_SIZE);
 180
 181   net_write_registers (mips_greg_packet, MIPS_GREG_PLEN, PTRACE_SETREGS);
 182
 183   /* Store floating point registers if the target has them.  */
 184
 185   if (target_has_fp)
 186     {
 187       /* Copy the floating point data registers.  */
 188
 189       bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],
 190              &mips_fpreg_packet[MIPS_R_FP0],
 191              REGISTER_RAW_SIZE (FP0_REGNUM) * 32);
 192
 193       /* Copy the floating point control/status register (fpcsr).  */
 194
 195       bcopy (&registers[REGISTER_BYTE (FCRCS_REGNUM)],
 196              &mips_fpreg_packet[MIPS_R_FPCSR],
 197              REGISTER_RAW_SIZE (FCRCS_REGNUM));
 198
 199       net_write_registers (mips_fpreg_packet, MIPS_FPREG_PLEN,
 200                            PTRACE_SETFPREGS);
 201     }
 202 }