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 "gdb_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 (int regno)
  71 {
  72   char mips_greg_packet[MIPS_GREG_PLEN];
  73   char mips_fpreg_packet[MIPS_FPREG_PLEN];
  74
  75   /* Get general-purpose registers.  */
  76
  77   net_read_registers (mips_greg_packet, MIPS_GREG_PLEN, PTRACE_GETREGS);
  78
  79   /* this code copies the registers obtained by RPC
  80      stored in a structure(s) like this :
  81
  82      Register(s)                Offset(s)
  83      gp 0-31                    0x00
  84      hi                 0x80
  85      lo                 0x84
  86      sr                 0x88
  87      pc                 0x8c
  88
  89      into a stucture like this:
  90
  91      0x00       GP 0-31
  92      0x80       SR
  93      0x84       LO
  94      0x88       HI
  95      0x8C       BAD             --- Not available currently
  96      0x90       CAUSE           --- Not available currently
  97      0x94       PC
  98      0x98       FP 0-31
  99      0x118      FCSR
 100      0x11C      FIR             --- Not available currently
 101      0x120      FP              --- Not available currently
 102
 103      structure is 0x124 (292) bytes in length */
 104
 105   /* Copy the general registers.  */
 106
 107   bcopy (&mips_greg_packet[MIPS_R_GP0], &registers[0], 32 * MIPS_GREG_SIZE);
 108
 109   /* Copy SR, LO, HI, and PC.  */
 110
 111   bcopy (&mips_greg_packet[MIPS_R_SR],
 112          &registers[REGISTER_BYTE (PS_REGNUM)], MIPS_GREG_SIZE);
 113   bcopy (&mips_greg_packet[MIPS_R_LO],
 114          &registers[REGISTER_BYTE (LO_REGNUM)], MIPS_GREG_SIZE);
 115   bcopy (&mips_greg_packet[MIPS_R_HI],
 116          &registers[REGISTER_BYTE (HI_REGNUM)], MIPS_GREG_SIZE);
 117   bcopy (&mips_greg_packet[MIPS_R_PC],
 118          &registers[REGISTER_BYTE (PC_REGNUM)], MIPS_GREG_SIZE);
 119
 120   /* If the target has floating point registers, fetch them.
 121      Otherwise, zero the floating point register values in
 122      registers[] for good measure, even though we might not
 123      need to.  */
 124
 125   if (target_has_fp)
 126     {
 127       net_read_registers (mips_fpreg_packet, MIPS_FPREG_PLEN,
 128                           PTRACE_GETFPREGS);
 129
 130       /* Copy the floating point registers.  */
 131
 132       bcopy (&mips_fpreg_packet[MIPS_R_FP0],
 133              &registers[REGISTER_BYTE (FP0_REGNUM)],
 134              REGISTER_RAW_SIZE (FP0_REGNUM) * 32);
 135
 136       /* Copy the floating point control/status register (fpcsr).  */
 137
 138       bcopy (&mips_fpreg_packet[MIPS_R_FPCSR],
 139              &registers[REGISTER_BYTE (FCRCS_REGNUM)],
 140              REGISTER_RAW_SIZE (FCRCS_REGNUM));
 141     }
 142   else
 143     {
 144       bzero ((char *) &registers[REGISTER_BYTE (FP0_REGNUM)],
 145              REGISTER_RAW_SIZE (FP0_REGNUM) * 32);
 146       bzero ((char *) &registers[REGISTER_BYTE (FCRCS_REGNUM)],
 147              REGISTER_RAW_SIZE (FCRCS_REGNUM));
 148     }
 149
 150   /* Mark the register cache valid.  */
 151
 152   registers_fetched ();
 153 }
 154
 155 /* Store a register or registers into the VxWorks target.
 156    REGNO is the register to store, or -1 for all; currently,
 157    it is ignored.  FIXME look at regno to improve efficiency.  */
 158
 159 vx_write_register (int regno)
 160 {
 161   char mips_greg_packet[MIPS_GREG_PLEN];
 162   char mips_fpreg_packet[MIPS_FPREG_PLEN];
 163
 164   /* Store general registers.  */
 165
 166   bcopy (&registers[0], &mips_greg_packet[MIPS_R_GP0], 32 * MIPS_GREG_SIZE);
 167
 168   /* Copy SR, LO, HI, and PC.  */
 169
 170   bcopy (&registers[REGISTER_BYTE (PS_REGNUM)],
 171          &mips_greg_packet[MIPS_R_SR], MIPS_GREG_SIZE);
 172   bcopy (&registers[REGISTER_BYTE (LO_REGNUM)],
 173          &mips_greg_packet[MIPS_R_LO], MIPS_GREG_SIZE);
 174   bcopy (&registers[REGISTER_BYTE (HI_REGNUM)],
 175          &mips_greg_packet[MIPS_R_HI], MIPS_GREG_SIZE);
 176   bcopy (&registers[REGISTER_BYTE (PC_REGNUM)],
 177          &mips_greg_packet[MIPS_R_PC], MIPS_GREG_SIZE);
 178
 179   net_write_registers (mips_greg_packet, MIPS_GREG_PLEN, PTRACE_SETREGS);
 180
 181   /* Store floating point registers if the target has them.  */
 182
 183   if (target_has_fp)
 184     {
 185       /* Copy the floating point data registers.  */
 186
 187       bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],
 188              &mips_fpreg_packet[MIPS_R_FP0],
 189              REGISTER_RAW_SIZE (FP0_REGNUM) * 32);
 190
 191       /* Copy the floating point control/status register (fpcsr).  */
 192
 193       bcopy (&registers[REGISTER_BYTE (FCRCS_REGNUM)],
 194              &mips_fpreg_packet[MIPS_R_FPCSR],
 195              REGISTER_RAW_SIZE (FCRCS_REGNUM));
 196
 197       net_write_registers (mips_fpreg_packet, MIPS_FPREG_PLEN,
 198                            PTRACE_SETFPREGS);
 199     }
 200 }