gdb/remote-vx29k.c

   1 /* Am29k-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
  44 #ifdef _AIX                     /* IBM claims "void *malloc()" not char * */
  45 #define malloc bogon_malloc
  46 #endif
  47
  48 #include <rpc/rpc.h>
  49 #include <sys/time.h>           /* UTek's <rpc/rpc.h> doesn't #incl this */
  50 #include <netdb.h>
  51 #include "vx-share/ptrace.h"
  52 #include "vx-share/xdr_ptrace.h"
  53 #include "vx-share/xdr_ld.h"
  54 #include "vx-share/xdr_rdb.h"
  55 #include "vx-share/dbgRpcLib.h"
  56
  57 /* get rid of value.h if possible */
  58 #include <value.h>
  59 #include <symtab.h>
  60
  61 /* Flag set if target has fpu */
  62
  63 extern int target_has_fp;
  64
  65 /* Generic register read/write routines in remote-vx.c.  */
  66
  67 extern void net_read_registers ();
  68 extern void net_write_registers ();
  69
  70 /* Read a register or registers from the VxWorks target.
  71    REGNO is the register to read, or -1 for all; currently,
  72    it is ignored.  FIXME look at regno to improve efficiency.  */
  73
  74 void
  75 vx_read_register (int regno)
  76 {
  77   char am29k_greg_packet[AM29K_GREG_PLEN];
  78   char am29k_fpreg_packet[AM29K_FPREG_PLEN];
  79
  80   /* Get general-purpose registers.  When copying values into
  81      registers [], don't assume that a location in registers []
  82      is properly aligned for the target data type.  */
  83
  84   net_read_registers (am29k_greg_packet, AM29K_GREG_PLEN, PTRACE_GETREGS);
  85
  86   /* Now copy the register values into registers[].
  87      Note that this code depends on the ordering of the REGNUMs
  88      as defined in "tm-29k.h".  */
  89
  90   bcopy (&am29k_greg_packet[AM29K_R_GR96],
  91          &registers[REGISTER_BYTE (GR96_REGNUM)], 160 * AM29K_GREG_SIZE);
  92   bcopy (&am29k_greg_packet[AM29K_R_VAB],
  93          &registers[REGISTER_BYTE (VAB_REGNUM)], 15 * AM29K_GREG_SIZE);
  94   registers[REGISTER_BYTE (INTE_REGNUM)] = am29k_greg_packet[AM29K_R_INTE];
  95   bcopy (&am29k_greg_packet[AM29K_R_RSP],
  96          &registers[REGISTER_BYTE (GR1_REGNUM)], 5 * AM29K_GREG_SIZE);
  97
  98   /* PAD For now, don't care about exop register */
  99
 100   memset (&registers[REGISTER_BYTE (EXO_REGNUM)], '\0', AM29K_GREG_SIZE);
 101
 102   /* If the target has floating point registers, fetch them.
 103      Otherwise, zero the floating point register values in
 104      registers[] for good measure, even though we might not
 105      need to.  */
 106
 107   if (target_has_fp)
 108     {
 109       net_read_registers (am29k_fpreg_packet, AM29K_FPREG_PLEN,
 110                           PTRACE_GETFPREGS);
 111       registers[REGISTER_BYTE (FPE_REGNUM)] = am29k_fpreg_packet[AM29K_R_FPE];
 112       registers[REGISTER_BYTE (FPS_REGNUM)] = am29k_fpreg_packet[AM29K_R_FPS];
 113
 114       /* PAD For now, don't care about registers (?) AI0 to q */
 115
 116       memset (&registers[REGISTER_BYTE (161)], '\0', 21 * AM29K_FPREG_SIZE);
 117     }
 118   else
 119     {
 120       memset (&registers[REGISTER_BYTE (FPE_REGNUM)], '\0', AM29K_FPREG_SIZE);
 121       memset (&registers[REGISTER_BYTE (FPS_REGNUM)], '\0', AM29K_FPREG_SIZE);
 122
 123       /* PAD For now, don't care about registers (?) AI0 to q */
 124
 125       memset (&registers[REGISTER_BYTE (161)], '\0', 21 * AM29K_FPREG_SIZE);
 126     }
 127
 128   /* Mark the register cache valid.  */
 129
 130   registers_fetched ();
 131 }
 132
 133 /* Store a register or registers into the VxWorks target.
 134    REGNO is the register to store, or -1 for all; currently,
 135    it is ignored.  FIXME look at regno to improve efficiency.  */
 136
 137 void
 138 vx_write_register (int regno)
 139 {
 140   char am29k_greg_packet[AM29K_GREG_PLEN];
 141   char am29k_fpreg_packet[AM29K_FPREG_PLEN];
 142
 143   /* Store general purpose registers.  When copying values from
 144      registers [], don't assume that a location in registers []
 145      is properly aligned for the target data type.  */
 146
 147   bcopy (&registers[REGISTER_BYTE (GR96_REGNUM)],
 148          &am29k_greg_packet[AM29K_R_GR96], 160 * AM29K_GREG_SIZE);
 149   bcopy (&registers[REGISTER_BYTE (VAB_REGNUM)],
 150          &am29k_greg_packet[AM29K_R_VAB], 15 * AM29K_GREG_SIZE);
 151   am29k_greg_packet[AM29K_R_INTE] = registers[REGISTER_BYTE (INTE_REGNUM)];
 152   bcopy (&registers[REGISTER_BYTE (GR1_REGNUM)],
 153          &am29k_greg_packet[AM29K_R_RSP], 5 * AM29K_GREG_SIZE);
 154
 155   net_write_registers (am29k_greg_packet, AM29K_GREG_PLEN, PTRACE_SETREGS);
 156
 157   /* Store floating point registers if the target has them.  */
 158
 159   if (target_has_fp)
 160     {
 161       am29k_fpreg_packet[AM29K_R_FPE] = registers[REGISTER_BYTE (FPE_REGNUM)];
 162       am29k_fpreg_packet[AM29K_R_FPS] = registers[REGISTER_BYTE (FPS_REGNUM)];
 163
 164       net_write_registers (am29k_fpreg_packet, AM29K_FPREG_PLEN,
 165                            PTRACE_SETFPREGS);
 166     }
 167 }
 168
 169 /* VxWorks zeroes fp when the task is initialized; we use this
 170    to terminate the frame chain. Chain means here the nominal address of
 171    a frame, that is, the return address (lr0) address in the stack. To
 172    obtain the frame pointer (lr1) contents, we must add 4 bytes.
 173    Note : may be we should modify init_frame_info() to get the frame pointer
 174    and store it into the frame_info struct rather than reading its
 175    contents when FRAME_CHAIN_VALID is invoked. */
 176
 177 int
 178 vx29k_frame_chain_valid (chain, thisframe)
 179      CORE_ADDR chain;
 180      struct frame_info *thisframe;      /* not used here */
 181 {
 182   int fp_contents;
 183
 184   read_memory ((CORE_ADDR) (chain + 4), (char *) &fp_contents, 4);
 185   return (fp_contents != 0);
 186 }