Prevent writes to R15 via LDR or LDM from changing the ARM/Thumb state in pre-v5...

[deliverable/binutils-gdb.git] / sim / arm / dbg_cp.h

/*  dbg_cp.h -- ARMulator debug interface:  ARM6 Instruction Emulator.
    Copyright (C) 1994 Advanced RISC Machines Ltd.
 
    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 3 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, see <http://www.gnu.org/licenses/>. */

#ifndef Dbg_CP__h

#define Dbg_CP__h

#define Dbg_Access_Readable  1
#define Dbg_Access_Writable  2
#define Dbg_Access_CPDT      4	/* else CPRT */

typedef struct
{
  unsigned short rmin, rmax;
  /* a single description can be used for a range of registers with
     the same properties *accessed via CPDT instructions*
   */
  unsigned char nbytes;		/* size of register */
  unsigned char access;		/* see above (Access_xxx) */
  union
  {
    struct
    {
      /* CPDT instructions do not allow the coprocessor much freedom:
	 only bit 22 ('N') and 12-15 ('CRd') are free for the
	 coprocessor to use as it sees fit.  */
      unsigned char nbit;
      unsigned char rdbits;
    }
    cpdt;
    struct
    {
      /* CPRT instructions have much more latitude.  The bits fixed
	 by the ARM are  24..31 (condition mask & opcode)
	 20 (direction)
	 8..15 (cpnum, arm register)
	 4 (CPRT not CPDO)
	 leaving 14 bits free to the coprocessor (fortunately
	 falling within two bytes).  */
      unsigned char read_b0, read_b1, write_b0, write_b1;
    }
    cprt;
  }
  accessinst;
}
Dbg_CoProRegDesc;

struct Dbg_CoProDesc
{
  int entries;
  Dbg_CoProRegDesc regdesc[1 /* really nentries */ ];
};

#define Dbg_CoProDesc_Size(n) (sizeof(struct Dbg_CoProDesc) + (n-1)*sizeof(Dbg_CoProRegDesc))

#endif