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 "target.h"
  30 #include "gdbcore.h"
  31 #include "command.h"
  32 #include "symtab.h"
  33 #include "symfile.h"            /* for struct complaint */
  34
  35 #include "gdb_string.h"
  36 #include <errno.h>
  37 #include <signal.h>
  38 #include <fcntl.h>
  39 #include <sys/types.h>
  40 #include <sys/time.h>
  41 #include <sys/socket.h>
  42
  43 #ifdef _AIX                     /* IBM claims "void *malloc()" not char * */
  44 #define malloc bogon_malloc
  45 #endif
  46
  47 #include <rpc/rpc.h>
  48 #include <sys/time.h>           /* UTek's <rpc/rpc.h> doesn't #incl this */
  49 #include <netdb.h>
  50 #include "vx-share/ptrace.h"
  51 #include "vx-share/xdr_ptrace.h"
  52 #include "vx-share/xdr_ld.h"
  53 #include "vx-share/xdr_rdb.h"
  54 #include "vx-share/dbgRpcLib.h"
  55
  56 /* get rid of value.h if possible */
  57 #include <value.h>
  58 #include <symtab.h>
  59
  60 /* Flag set if target has fpu */
  61
  62 extern int target_has_fp;
  63
  64 /* Generic register read/write routines in remote-vx.c.  */
  65
  66 extern void net_read_registers ();
  67 extern void net_write_registers ();
  68
  69 /* Read a register or registers from the VxWorks target.
  70    REGNO is the register to read, or -1 for all; currently,
  71    it is ignored.  FIXME look at regno to improve efficiency.  */
  72
  73 void
  74 vx_read_register (int regno)
  75 {
  76   char am29k_greg_packet[AM29K_GREG_PLEN];
  77   char am29k_fpreg_packet[AM29K_FPREG_PLEN];
  78
  79   /* Get general-purpose registers.  When copying values into
  80      registers [], don't assume that a location in registers []
  81      is properly aligned for the target data type.  */
  82
  83   net_read_registers (am29k_greg_packet, AM29K_GREG_PLEN, PTRACE_GETREGS);
  84
  85   /* Now copy the register values into registers[].
  86      Note that this code depends on the ordering of the REGNUMs
  87      as defined in "tm-29k.h".  */
  88
  89   bcopy (&am29k_greg_packet[AM29K_R_GR96],
  90          &registers[REGISTER_BYTE (GR96_REGNUM)], 160 * AM29K_GREG_SIZE);
  91   bcopy (&am29k_greg_packet[AM29K_R_VAB],
  92          &registers[REGISTER_BYTE (VAB_REGNUM)], 15 * AM29K_GREG_SIZE);
  93   registers[REGISTER_BYTE (INTE_REGNUM)] = am29k_greg_packet[AM29K_R_INTE];
  94   bcopy (&am29k_greg_packet[AM29K_R_RSP],
  95          &registers[REGISTER_BYTE (GR1_REGNUM)], 5 * AM29K_GREG_SIZE);
  96
  97   /* PAD For now, don't care about exop register */
  98
  99   memset (&registers[REGISTER_BYTE (EXO_REGNUM)], '\0', AM29K_GREG_SIZE);
 100
 101   /* If the target has floating point registers, fetch them.
 102      Otherwise, zero the floating point register values in
 103      registers[] for good measure, even though we might not
 104      need to.  */
 105
 106   if (target_has_fp)
 107     {
 108       net_read_registers (am29k_fpreg_packet, AM29K_FPREG_PLEN,
 109                           PTRACE_GETFPREGS);
 110       registers[REGISTER_BYTE (FPE_REGNUM)] = am29k_fpreg_packet[AM29K_R_FPE];
 111       registers[REGISTER_BYTE (FPS_REGNUM)] = am29k_fpreg_packet[AM29K_R_FPS];
 112
 113       /* PAD For now, don't care about registers (?) AI0 to q */
 114
 115       memset (&registers[REGISTER_BYTE (161)], '\0', 21 * AM29K_FPREG_SIZE);
 116     }
 117   else
 118     {
 119       memset (&registers[REGISTER_BYTE (FPE_REGNUM)], '\0', AM29K_FPREG_SIZE);
 120       memset (&registers[REGISTER_BYTE (FPS_REGNUM)], '\0', AM29K_FPREG_SIZE);
 121
 122       /* PAD For now, don't care about registers (?) AI0 to q */
 123
 124       memset (&registers[REGISTER_BYTE (161)], '\0', 21 * AM29K_FPREG_SIZE);
 125     }
 126
 127   /* Mark the register cache valid.  */
 128
 129   registers_fetched ();
 130 }
 131
 132 /* Store a register or registers into the VxWorks target.
 133    REGNO is the register to store, or -1 for all; currently,
 134    it is ignored.  FIXME look at regno to improve efficiency.  */
 135
 136 void
 137 vx_write_register (int regno)
 138 {
 139   char am29k_greg_packet[AM29K_GREG_PLEN];
 140   char am29k_fpreg_packet[AM29K_FPREG_PLEN];
 141
 142   /* Store general purpose registers.  When copying values from
 143      registers [], don't assume that a location in registers []
 144      is properly aligned for the target data type.  */
 145
 146   bcopy (&registers[REGISTER_BYTE (GR96_REGNUM)],
 147          &am29k_greg_packet[AM29K_R_GR96], 160 * AM29K_GREG_SIZE);
 148   bcopy (&registers[REGISTER_BYTE (VAB_REGNUM)],
 149          &am29k_greg_packet[AM29K_R_VAB], 15 * AM29K_GREG_SIZE);
 150   am29k_greg_packet[AM29K_R_INTE] = registers[REGISTER_BYTE (INTE_REGNUM)];
 151   bcopy (&registers[REGISTER_BYTE (GR1_REGNUM)],
 152          &am29k_greg_packet[AM29K_R_RSP], 5 * AM29K_GREG_SIZE);
 153
 154   net_write_registers (am29k_greg_packet, AM29K_GREG_PLEN, PTRACE_SETREGS);
 155
 156   /* Store floating point registers if the target has them.  */
 157
 158   if (target_has_fp)
 159     {
 160       am29k_fpreg_packet[AM29K_R_FPE] = registers[REGISTER_BYTE (FPE_REGNUM)];
 161       am29k_fpreg_packet[AM29K_R_FPS] = registers[REGISTER_BYTE (FPS_REGNUM)];
 162
 163       net_write_registers (am29k_fpreg_packet, AM29K_FPREG_PLEN,
 164                            PTRACE_SETFPREGS);
 165     }
 166 }
 167
 168 /* VxWorks zeroes fp when the task is initialized; we use this
 169    to terminate the frame chain. Chain means here the nominal address of
 170    a frame, that is, the return address (lr0) address in the stack. To
 171    obtain the frame pointer (lr1) contents, we must add 4 bytes.
 172    Note : may be we should modify init_frame_info() to get the frame pointer
 173    and store it into the frame_info struct rather than reading its
 174    contents when FRAME_CHAIN_VALID is invoked.  THISFRAME is unused.  */
 175
 176 int
 177 vx29k_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe)
 178 {
 179   int fp_contents;
 180
 181   read_memory ((CORE_ADDR) (chain + 4), (char *) &fp_contents, 4);
 182   return (fp_contents != 0);
 183 }