gdb/remote-vx29k.c

   1 /* Am29k-dependent portions of the RPC protocol
   2
   3    Contributed by Wind River Systems.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include <stdio.h>
  23 #include "defs.h"
  24
  25 #include "vx-share/regPacket.h"
  26 #include "frame.h"
  27 #include "inferior.h"
  28 #include "target.h"
  29 #include "gdbcore.h"
  30 #include "command.h"
  31 #include "symtab.h"
  32 #include "symfile.h"            /* for struct complaint */
  33 #include "regcache.h"
  34
  35 #include "gdb_string.h"
  36 #include <errno.h>
  37 #include <fcntl.h>
  38 #include <sys/types.h>
  39 #include <sys/time.h>
  40 #include <sys/socket.h>
  41
  42 #ifdef _AIX                     /* IBM claims "void *malloc()" not char * */
  43 #define malloc bogon_malloc
  44 #endif
  45
  46 #include <rpc/rpc.h>
  47 #include <sys/time.h>           /* UTek's <rpc/rpc.h> doesn't #incl this */
  48 #include <netdb.h>
  49 #include "vx-share/ptrace.h"
  50 #include "vx-share/xdr_ptrace.h"
  51 #include "vx-share/xdr_ld.h"
  52 #include "vx-share/xdr_rdb.h"
  53 #include "vx-share/dbgRpcLib.h"
  54
  55 /* get rid of value.h if possible */
  56 #include <value.h>
  57 #include <symtab.h>
  58
  59 /* Flag set if target has fpu */
  60
  61 extern int target_has_fp;
  62
  63 /* Generic register read/write routines in remote-vx.c.  */
  64
  65 extern void net_read_registers ();
  66 extern void net_write_registers ();
  67
  68 /* Read a register or registers from the VxWorks target.
  69    REGNO is the register to read, or -1 for all; currently,
  70    it is ignored.  FIXME look at regno to improve efficiency.  */
  71
  72 void
  73 vx_read_register (int regno)
  74 {
  75   char am29k_greg_packet[AM29K_GREG_PLEN];
  76   char am29k_fpreg_packet[AM29K_FPREG_PLEN];
  77
  78   /* Get general-purpose registers.  When copying values into
  79      registers [], don't assume that a location in registers []
  80      is properly aligned for the target data type.  */
  81
  82   net_read_registers (am29k_greg_packet, AM29K_GREG_PLEN, PTRACE_GETREGS);
  83
  84   /* Now copy the register values into registers[].
  85      Note that this code depends on the ordering of the REGNUMs
  86      as defined in "tm-29k.h".  */
  87
  88   bcopy (&am29k_greg_packet[AM29K_R_GR96],
  89          &registers[REGISTER_BYTE (GR96_REGNUM)], 160 * AM29K_GREG_SIZE);
  90   bcopy (&am29k_greg_packet[AM29K_R_VAB],
  91          &registers[REGISTER_BYTE (VAB_REGNUM)], 15 * AM29K_GREG_SIZE);
  92   registers[REGISTER_BYTE (INTE_REGNUM)] = am29k_greg_packet[AM29K_R_INTE];
  93   bcopy (&am29k_greg_packet[AM29K_R_RSP],
  94          &registers[REGISTER_BYTE (GR1_REGNUM)], 5 * AM29K_GREG_SIZE);
  95
  96   /* PAD For now, don't care about exop register */
  97
  98   memset (&registers[REGISTER_BYTE (EXO_REGNUM)], '\0', AM29K_GREG_SIZE);
  99
 100   /* If the target has floating point registers, fetch them.
 101      Otherwise, zero the floating point register values in
 102      registers[] for good measure, even though we might not
 103      need to.  */
 104
 105   if (target_has_fp)
 106     {
 107       net_read_registers (am29k_fpreg_packet, AM29K_FPREG_PLEN,
 108                           PTRACE_GETFPREGS);
 109       registers[REGISTER_BYTE (FPE_REGNUM)] = am29k_fpreg_packet[AM29K_R_FPE];
 110       registers[REGISTER_BYTE (FPS_REGNUM)] = am29k_fpreg_packet[AM29K_R_FPS];
 111
 112       /* PAD For now, don't care about registers (?) AI0 to q */
 113
 114       memset (&registers[REGISTER_BYTE (161)], '\0', 21 * AM29K_FPREG_SIZE);
 115     }
 116   else
 117     {
 118       memset (&registers[REGISTER_BYTE (FPE_REGNUM)], '\0', AM29K_FPREG_SIZE);
 119       memset (&registers[REGISTER_BYTE (FPS_REGNUM)], '\0', AM29K_FPREG_SIZE);
 120
 121       /* PAD For now, don't care about registers (?) AI0 to q */
 122
 123       memset (&registers[REGISTER_BYTE (161)], '\0', 21 * AM29K_FPREG_SIZE);
 124     }
 125
 126   /* Mark the register cache valid.  */
 127
 128   registers_fetched ();
 129 }
 130
 131 /* Store a register or registers into the VxWorks target.
 132    REGNO is the register to store, or -1 for all; currently,
 133    it is ignored.  FIXME look at regno to improve efficiency.  */
 134
 135 void
 136 vx_write_register (int regno)
 137 {
 138   char am29k_greg_packet[AM29K_GREG_PLEN];
 139   char am29k_fpreg_packet[AM29K_FPREG_PLEN];
 140
 141   /* Store general purpose registers.  When copying values from
 142      registers [], don't assume that a location in registers []
 143      is properly aligned for the target data type.  */
 144
 145   bcopy (&registers[REGISTER_BYTE (GR96_REGNUM)],
 146          &am29k_greg_packet[AM29K_R_GR96], 160 * AM29K_GREG_SIZE);
 147   bcopy (&registers[REGISTER_BYTE (VAB_REGNUM)],
 148          &am29k_greg_packet[AM29K_R_VAB], 15 * AM29K_GREG_SIZE);
 149   am29k_greg_packet[AM29K_R_INTE] = registers[REGISTER_BYTE (INTE_REGNUM)];
 150   bcopy (&registers[REGISTER_BYTE (GR1_REGNUM)],
 151          &am29k_greg_packet[AM29K_R_RSP], 5 * AM29K_GREG_SIZE);
 152
 153   net_write_registers (am29k_greg_packet, AM29K_GREG_PLEN, PTRACE_SETREGS);
 154
 155   /* Store floating point registers if the target has them.  */
 156
 157   if (target_has_fp)
 158     {
 159       am29k_fpreg_packet[AM29K_R_FPE] = registers[REGISTER_BYTE (FPE_REGNUM)];
 160       am29k_fpreg_packet[AM29K_R_FPS] = registers[REGISTER_BYTE (FPS_REGNUM)];
 161
 162       net_write_registers (am29k_fpreg_packet, AM29K_FPREG_PLEN,
 163                            PTRACE_SETFPREGS);
 164     }
 165 }
 166
 167 /* VxWorks zeroes fp when the task is initialized; we use this
 168    to terminate the frame chain. Chain means here the nominal address of
 169    a frame, that is, the return address (lr0) address in the stack. To
 170    obtain the frame pointer (lr1) contents, we must add 4 bytes.
 171    Note : may be we should modify init_frame_info() to get the frame pointer
 172    and store it into the frame_info struct rather than reading its
 173    contents when FRAME_CHAIN_VALID is invoked.  THISFRAME is unused.  */
 174
 175 int
 176 vx29k_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe)
 177 {
 178   int fp_contents;
 179
 180   read_memory ((CORE_ADDR) (chain + 4), (char *) &fp_contents, 4);
 181   return (fp_contents != 0);
 182 }