binutils-gdb/gdb/remote-vxmips.c

/* MIPS-dependent portions of the RPC protocol
   used with a VxWorks target 

Contributed by Wind River Systems.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include <stdio.h>
#include "defs.h"

#include "vx-share/regPacket.h"  
#include "frame.h"
#include "inferior.h"
#include "wait.h"
#include "target.h"
#include "gdbcore.h"
#include "command.h"
#include "symtab.h"
#include "symfile.h"		/* for struct complaint */

#include "gdb_string.h"
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <rpc/rpc.h>
#include <sys/time.h>		/* UTek's <rpc/rpc.h> doesn't #incl this */
#include <netdb.h>
#include "vx-share/ptrace.h"
#include "vx-share/xdr_ptrace.h"
#include "vx-share/xdr_ld.h"
#include "vx-share/xdr_rdb.h"
#include "vx-share/dbgRpcLib.h"

/* get rid of value.h if possible */
#include <value.h>
#include <symtab.h>

/* Flag set if target has fpu */

extern int target_has_fp;

/* Generic register read/write routines in remote-vx.c.  */

extern void net_read_registers ();
extern void net_write_registers ();

/* Read a register or registers from the VxWorks target.
   REGNO is the register to read, or -1 for all; currently,
   it is ignored.  FIXME look at regno to improve efficiency.  */

void
vx_read_register (regno)
     int regno;
{
  char mips_greg_packet[MIPS_GREG_PLEN];
  char mips_fpreg_packet[MIPS_FPREG_PLEN];

  /* Get general-purpose registers.  */

  net_read_registers (mips_greg_packet, MIPS_GREG_PLEN, PTRACE_GETREGS);

  /* this code copies the registers obtained by RPC 
     stored in a structure(s) like this :
     
    	Register(s)		Offset(s)
   	gp 0-31			0x00
   	hi			0x80
   	lo			0x84
   	sr			0x88
   	pc			0x8c
    
     into a stucture like this:
   	
   	0x00	GP 0-31
   	0x80   	SR
   	0x84	LO
   	0x88	HI
   	0x8C	BAD    		--- Not available currently
   	0x90	CAUSE    	--- Not available currently
   	0x94	PC
   	0x98	FP 0-31
   	0x118	FCSR
   	0x11C	FIR    		--- Not available currently
   	0x120	FP	    	--- Not available currently
   
     structure is 0x124 (292) bytes in length */
   
  /* Copy the general registers.  */
  
  bcopy (&mips_greg_packet[MIPS_R_GP0], &registers[0], 32 * MIPS_GREG_SIZE);
  
  /* Copy SR, LO, HI, and PC.  */
  
  bcopy (&mips_greg_packet[MIPS_R_SR],
         &registers[REGISTER_BYTE (PS_REGNUM)], MIPS_GREG_SIZE);
  bcopy (&mips_greg_packet[MIPS_R_LO],
         &registers[REGISTER_BYTE (LO_REGNUM)], MIPS_GREG_SIZE);
  bcopy (&mips_greg_packet[MIPS_R_HI],
         &registers[REGISTER_BYTE (HI_REGNUM)], MIPS_GREG_SIZE);
  bcopy (&mips_greg_packet[MIPS_R_PC],
         &registers[REGISTER_BYTE (PC_REGNUM)], MIPS_GREG_SIZE);
  
  /* If the target has floating point registers, fetch them.
     Otherwise, zero the floating point register values in
     registers[] for good measure, even though we might not
     need to.  */
    
  if (target_has_fp)
    {
      net_read_registers (mips_fpreg_packet, MIPS_FPREG_PLEN,
			  PTRACE_GETFPREGS);

      /* Copy the floating point registers.  */

      bcopy (&mips_fpreg_packet[MIPS_R_FP0], 
	     &registers[REGISTER_BYTE (FP0_REGNUM)],
	     REGISTER_RAW_SIZE (FP0_REGNUM) * 32);

      /* Copy the floating point control/status register (fpcsr).  */

      bcopy (&mips_fpreg_packet[MIPS_R_FPCSR], 
	     &registers[REGISTER_BYTE (FCRCS_REGNUM)],
	     REGISTER_RAW_SIZE (FCRCS_REGNUM));
    }	
  else
    {	
      bzero ((char *) &registers[REGISTER_BYTE (FP0_REGNUM)],
	     REGISTER_RAW_SIZE (FP0_REGNUM) * 32);
      bzero ((char *) &registers[REGISTER_BYTE (FCRCS_REGNUM)],
	     REGISTER_RAW_SIZE (FCRCS_REGNUM));
    }		

  /* Mark the register cache valid.  */

  registers_fetched ();
}

/* Store a register or registers into the VxWorks target.
   REGNO is the register to store, or -1 for all; currently,
   it is ignored.  FIXME look at regno to improve efficiency.  */

vx_write_register (regno)
     int regno;
{
  char mips_greg_packet[MIPS_GREG_PLEN];
  char mips_fpreg_packet[MIPS_FPREG_PLEN];

  /* Store general registers.  */

  bcopy (&registers[0], &mips_greg_packet[MIPS_R_GP0], 32 * MIPS_GREG_SIZE);
  
  /* Copy SR, LO, HI, and PC.  */
  
  bcopy (&registers[REGISTER_BYTE (PS_REGNUM)],
         &mips_greg_packet[MIPS_R_SR], MIPS_GREG_SIZE);
  bcopy (&registers[REGISTER_BYTE (LO_REGNUM)],
         &mips_greg_packet[MIPS_R_LO], MIPS_GREG_SIZE);
  bcopy (&registers[REGISTER_BYTE (HI_REGNUM)],
         &mips_greg_packet[MIPS_R_HI], MIPS_GREG_SIZE);
  bcopy (&registers[REGISTER_BYTE (PC_REGNUM)],
         &mips_greg_packet[MIPS_R_PC], MIPS_GREG_SIZE);
  
  net_write_registers (mips_greg_packet, MIPS_GREG_PLEN, PTRACE_SETREGS);

  /* Store floating point registers if the target has them.  */

  if (target_has_fp)
    {
      /* Copy the floating point data registers.  */

      bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],
	     &mips_fpreg_packet[MIPS_R_FP0], 
	     REGISTER_RAW_SIZE (FP0_REGNUM) * 32);

      /* Copy the floating point control/status register (fpcsr).  */

      bcopy (&registers[REGISTER_BYTE (FCRCS_REGNUM)],
	     &mips_fpreg_packet[MIPS_R_FPCSR], 
	     REGISTER_RAW_SIZE (FCRCS_REGNUM));

      net_write_registers (mips_fpreg_packet, MIPS_FPREG_PLEN,
			   PTRACE_SETFPREGS);
    }
}

/* Convert from an extended float to a double.
   The extended float is stored as raw data pointed to by FROM.
   Return the converted value as raw data in the double pointed to by TO.
   NOTE: mips uses standard two word doubles.  */

void
vx_convert_to_virtual (regno, from, to)
      int regno;
      char *from;
      char *to;
{
  bcopy (from, to, REGISTER_VIRTUAL_SIZE (regno));
}

/* The converse:  convert from a double to an extended float.
   The double is stored as raw data pointed to by FROM.
   Return the converted value as raw data in the extended
   float pointed to by TO.  */

void
vx_convert_from_virtual (regno, from, to)
     int regno;
     char *from;
     char *to;
{
  bcopy (from, to, REGISTER_VIRTUAL_SIZE (regno));
}