tm-a29k.h

lwip在ucos上的移植

/* Parameters for target machine AMD 29000, for GDB, the GNU debugger.
   Copyright 1990, 1991, 1993, 1994 Free Software Foundation, Inc.
   Contributed by Cygnus Support.  Written by Jim Kingdon.

   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.  */

/* Parameters for an EB29K (a board which plugs into a PC and is
   accessed through EBMON software running on the PC, which we
   use as we'd use a remote stub (see remote-eb.c).

   If gdb is ported to other a29k machines/systems, the
   machine/system-specific parts should be removed from this file (a
   la tm-m68k.h).  */

/* Byte order is configurable, but this machine runs big-endian.  */
#define TARGET_BYTE_ORDER BIG_ENDIAN

/* Floating point uses IEEE representations.  */
#define IEEE_FLOAT

/* Recognize our magic number.  */
#define BADMAG(x) ((x).f_magic != 0572)

/* Offset from address of function to start of its code.
   Zero on most machines.  */

#define FUNCTION_START_OFFSET 0

/* Advance PC across any function entry prologue instructions
   to reach some "real" code.  */

#define SKIP_PROLOGUE(pc) (a29k_skip_prologue (pc))
CORE_ADDR a29k_skip_prologue ();

/* Immediately after a function call, return the saved pc.
   Can't go through the frames for this because on some machines
   the new frame is not set up until the new function executes
   some instructions.  */

#define SAVED_PC_AFTER_CALL(frame) ((frame->flags & TRANSPARENT_FRAME) \
				    ? read_register (TPC_REGNUM) \
				    : read_register (LR0_REGNUM))

/* Stack grows downward.  */

#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))

/* Stack must be aligned on 32-bit boundaries when synthesizing
   function calls. */

#define STACK_ALIGN(ADDR) (((ADDR) + 3) & ~3)

/* Sequence of bytes for breakpoint instruction.  */
/* ASNEQ 0x50, gr1, gr1
   The trap number 0x50 is chosen arbitrarily.
   We let the command line (or previously included files) override this
   setting.  */
#ifndef BREAKPOINT
#if TARGET_BYTE_ORDER == BIG_ENDIAN
#define BREAKPOINT {0x72, 0x50, 0x01, 0x01}
#else /* Target is little-endian.  */
#define BREAKPOINT {0x01, 0x01, 0x50, 0x72}
#endif /* Target is little-endian.  */
#endif /* BREAKPOINT */

/* Amount PC must be decremented by after a breakpoint.
   This is often the number of bytes in BREAKPOINT
   but not always.  */

#define DECR_PC_AFTER_BREAK 0

/* Say how long (ordinary) registers are.  This is a piece of bogosity
   used in push_word and a few other places; REGISTER_RAW_SIZE is the
   real way to know how big a register is.  */

#define REGISTER_SIZE 4

/* Allow the register declarations here to be overridden for remote
   kernel debugging.  */
#if !defined (REGISTER_NAMES)

/* Number of machine registers */

#define NUM_REGS 205

/* Initializer for an array of names of registers.
   There should be NUM_REGS strings in this initializer.

   FIXME, add floating point registers and support here.

   Also note that this list does not attempt to deal with kernel
   debugging (in which the first 32 registers are gr64-gr95).  */

#define REGISTER_NAMES \
{"gr96", "gr97", "gr98", "gr99", "gr100", "gr101", "gr102", "gr103", "gr104", \
 "gr105", "gr106", "gr107", "gr108", "gr109", "gr110", "gr111", "gr112", \
 "gr113", "gr114", "gr115", "gr116", "gr117", "gr118", "gr119", "gr120", \
 "gr121", "gr122", "gr123", "gr124", "gr125", "gr126", "gr127",		 \
 "lr0", "lr1", "lr2", "lr3", "lr4", "lr5", "lr6", "lr7", "lr8", "lr9",   \
 "lr10", "lr11", "lr12", "lr13", "lr14", "lr15", "lr16", "lr17", "lr18", \
 "lr19", "lr20", "lr21", "lr22", "lr23", "lr24", "lr25", "lr26", "lr27", \
 "lr28", "lr29", "lr30", "lr31", "lr32", "lr33", "lr34", "lr35", "lr36", \
 "lr37", "lr38", "lr39", "lr40", "lr41", "lr42", "lr43", "lr44", "lr45", \
 "lr46", "lr47", "lr48", "lr49", "lr50", "lr51", "lr52", "lr53", "lr54", \
 "lr55", "lr56", "lr57", "lr58", "lr59", "lr60", "lr61", "lr62", "lr63", \
 "lr64", "lr65", "lr66", "lr67", "lr68", "lr69", "lr70", "lr71", "lr72", \
 "lr73", "lr74", "lr75", "lr76", "lr77", "lr78", "lr79", "lr80", "lr81", \
 "lr82", "lr83", "lr84", "lr85", "lr86", "lr87", "lr88", "lr89", "lr90", \
 "lr91", "lr92", "lr93", "lr94", "lr95", "lr96", "lr97", "lr98", "lr99", \
 "lr100", "lr101", "lr102", "lr103", "lr104", "lr105", "lr106", "lr107", \
 "lr108", "lr109", "lr110", "lr111", "lr112", "lr113", "lr114", "lr115", \
 "lr116", "lr117", "lr118", "lr119", "lr120", "lr121", "lr122", "lr123", \
 "lr124", "lr125", "lr126", "lr127",					 \
  "AI0", "AI1", "AI2", "AI3", "AI4", "AI5", "AI6", "AI7", "AI8", "AI9",  \
  "AI10", "AI11", "AI12", "AI13", "AI14", "AI15", "FP",			 \
  "bp", "fc", "cr", "q",						 \
  "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr",	 \
  "pc0", "pc1", "pc2", "mmu", "lru", "fpe", "inte", "fps", "exo", "gr1",  \
  "alu", "ipc", "ipa", "ipb" }

/*
 * Converts an sdb register number to an internal gdb register number.
 * Currently under epi, gr96->0...gr127->31...lr0->32...lr127->159, or...
 *                      gr64->0...gr95->31, lr0->32...lr127->159.
 */
#define SDB_REG_TO_REGNUM(value) \
  (((value) >= 96 && (value) <= 127) ? ((value) - 96) : \
   ((value) >= 128 && (value) <=  255) ? ((value) - 128 + LR0_REGNUM) : \
   (value))

/*
 * Provide the processor register numbers of some registers that are
 * expected/written in instructions that might change under different
 * register sets.  Namely, gcc can compile (-mkernel-registers) so that
 * it uses gr64-gr95 in stead of gr96-gr127.
 */
#define MSP_HW_REGNUM	125	/* gr125 */
#define RAB_HW_REGNUM	126	/* gr126 */

/* Convert Processor Special register #x to REGISTER_NAMES register # */
#define SR_REGNUM(x) \
  ((x) < 15  ? VAB_REGNUM + (x)					 \
   : (x) >= 128 && (x) < 131 ? IPC_REGNUM + (x) - 128		 \
   : (x) == 131 ? Q_REGNUM					 \
   : (x) == 132 ? ALU_REGNUM					 \
   : (x) >= 133 && (x) < 136 ? BP_REGNUM + (x) - 133		 \
   : (x) >= 160 && (x) < 163 ? FPE_REGNUM + (x) - 160		 \
   : (x) == 164 ? EXO_REGNUM                                     \
   : (error ("Internal error in SR_REGNUM"), 0))
#define GR96_REGNUM 0

/* Define the return register separately, so it can be overridden for
   kernel procedure calling conventions. */
#define	RETURN_REGNUM	GR96_REGNUM
#define GR1_REGNUM 200
/* This needs to be the memory stack pointer, not the register stack pointer,
   to make call_function work right.  */
#define SP_REGNUM MSP_REGNUM
#define FP_REGNUM 33		/* lr1 */

/* Return register for transparent calling convention (gr122).  */
#define TPC_REGNUM (122 - 96 + GR96_REGNUM)

/* Large Return Pointer (gr123).  */
#define LRP_REGNUM (123 - 96 + GR96_REGNUM)

/* Static link pointer (gr124).  */
#define SLP_REGNUM (124 - 96 + GR96_REGNUM)

/* Memory Stack Pointer (gr125).  */
#define MSP_REGNUM (125 - 96 + GR96_REGNUM)

/* Register allocate bound (gr126).  */
#define RAB_REGNUM (126 - 96 + GR96_REGNUM)

/* Register Free Bound (gr127).  */
#define RFB_REGNUM (127 - 96 + GR96_REGNUM)

/* Register Stack Pointer.  */
#define RSP_REGNUM GR1_REGNUM
#define LR0_REGNUM 32
#define BP_REGNUM 177
#define FC_REGNUM 178
#define CR_REGNUM 179
#define Q_REGNUM 180
#define VAB_REGNUM 181
#define OPS_REGNUM (VAB_REGNUM + 1)
#define CPS_REGNUM (VAB_REGNUM + 2)
#define CFG_REGNUM (VAB_REGNUM + 3)
#define CHA_REGNUM (VAB_REGNUM + 4)
#define CHD_REGNUM (VAB_REGNUM + 5)
#define CHC_REGNUM (VAB_REGNUM + 6)
#define RBP_REGNUM (VAB_REGNUM + 7)
#define TMC_REGNUM (VAB_REGNUM + 8)
#define TMR_REGNUM (VAB_REGNUM + 9)
#define NPC_REGNUM (VAB_REGNUM + 10)	/* pc0 */
#define PC_REGNUM  (VAB_REGNUM + 11)	/* pc1 */
#define PC2_REGNUM (VAB_REGNUM + 12)
#define MMU_REGNUM (VAB_REGNUM + 13)
#define LRU_REGNUM (VAB_REGNUM + 14)
#define FPE_REGNUM (VAB_REGNUM + 15)
#define INTE_REGNUM (VAB_REGNUM + 16)
#define FPS_REGNUM (VAB_REGNUM + 17)
#define EXO_REGNUM (VAB_REGNUM + 18)
/* gr1 is defined above as 200 = VAB_REGNUM + 19 */
#define ALU_REGNUM (VAB_REGNUM + 20)
#define PS_REGNUM  ALU_REGNUM
#define IPC_REGNUM (VAB_REGNUM + 21)
#define IPA_REGNUM (VAB_REGNUM + 22)
#define IPB_REGNUM (VAB_REGNUM + 23)

#endif /* !defined(REGISTER_NAMES) */

/* Total amount of space needed to store our copies of the machine's
   register state, the array `registers'.  */
#define REGISTER_BYTES (NUM_REGS * 4)

/* Index within `registers' of the first byte of the space for
   register N.  */
#define REGISTER_BYTE(N)  ((N)*4)

/* Number of bytes of storage in the actual machine representation
   for register N.  */

/* All regs are 4 bytes.  */

#define REGISTER_RAW_SIZE(N) (4)

/* Number of bytes of storage in the program's representation
   for register N.  */

/* All regs are 4 bytes.  */

#define REGISTER_VIRTUAL_SIZE(N) (4)

/* Largest value REGISTER_RAW_SIZE can have.  */

#define MAX_REGISTER_RAW_SIZE (4)

/* Largest value REGISTER_VIRTUAL_SIZE can have.  */

#define MAX_REGISTER_VIRTUAL_SIZE (4)

/* Return the GDB type object for the "standard" data type
   of data in register N.  */

#define REGISTER_VIRTUAL_TYPE(N) \
  (((N) == PC_REGNUM || (N) == LRP_REGNUM || (N) == SLP_REGNUM         \
    || (N) == MSP_REGNUM || (N) == RAB_REGNUM || (N) == RFB_REGNUM     \
    || (N) == GR1_REGNUM || (N) == FP_REGNUM || (N) == LR0_REGNUM       \
    || (N) == NPC_REGNUM || (N) == PC2_REGNUM)                           \
   ? lookup_pointer_type (builtin_type_void) : builtin_type_int)

/* Store the address of the place in which to copy the structure the
   subroutine will return.  This is called from call_function. */
/* On the a29k the LRP points to the part of the structure beyond the first
   16 words.  */
#define STORE_STRUCT_RETURN(ADDR, SP) \
  write_register (LRP_REGNUM, (ADDR) + 16 * 4);

/* Should call_function allocate stack space for a struct return?  */
/* On the a29k objects over 16 words require the caller to allocate space.  */
extern use_struct_convention_fn a29k_use_struct_convention;
#define USE_STRUCT_CONVENTION(gcc_p, type) a29k_use_struct_convention (gcc_p, type)

/* Extract from an array REGBUF containing the (raw) register state
   a function return value of type TYPE, and copy that, in virtual format,
   into VALBUF.  */

#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF)	      \
  {    	       	       	       	       	       	       	       	       	   \
    int reg_length = TYPE_LENGTH (TYPE);				   \
    if (reg_length > 16 * 4)						   \
      {									   \
	reg_length = 16 * 4;						   \
	read_memory (*((int *)(REGBUF) + LRP_REGNUM), (VALBUF) + 16 * 4,   \
		     TYPE_LENGTH (TYPE) - 16 * 4);			   \
      }									   \
    memcpy ((VALBUF), ((int *)(REGBUF))+RETURN_REGNUM, reg_length);	   \
  }

/* Write into appropriate registers a function return value
   of type TYPE, given in virtual format.  */

#define STORE_RETURN_VALUE(TYPE,VALBUF) \
  {									  \
    int reg_length = TYPE_LENGTH (TYPE);				  \
    if (reg_length > 16 * 4)						  \
      {									  \
        reg_length = 16 * 4;						  \
        write_memory (read_register (LRP_REGNUM),			  \
		      (char *)(VALBUF) + 16 * 4,			  \
		      TYPE_LENGTH (TYPE) - 16 * 4);			  \
      }									  \
    write_register_bytes (REGISTER_BYTE (RETURN_REGNUM), (char *)(VALBUF),  \
			  TYPE_LENGTH (TYPE));				  \
  }
/* *INDENT-OFF* */
/* The a29k user's guide documents well what the stacks look like.
   But what isn't so clear there is how this interracts with the
   symbols, or with GDB.
   In the following saved_msp, saved memory stack pointer (which functions
   as a memory frame pointer), means either
   a register containing the memory frame pointer or, in the case of
   functions with fixed size memory frames (i.e. those who don't use
   alloca()), the result of the calculation msp + msize.

   LOC_ARG, LOC_LOCAL - For GCC, these are relative to saved_msp.
   For high C, these are relative to msp (making alloca impossible).
   LOC_REGISTER, LOC_REGPARM - The register number is the number at the
   time the function is running (after the prologue), or in the case
   of LOC_REGPARM, may be a register number in the range 160-175.

   The compilers do things like store an argument into memory, and then put out
   a LOC_ARG for it, or put it into global registers and put out a
   LOC_REGPARM.  Thus is it important to execute the first line of
   code (i.e. the line of the open brace, i.e. the prologue) of a function
   before trying to print arguments or anything.

   The following diagram attempts to depict what is going on in memory
   (see also the _a29k user's guide_) and also how that interacts with
   GDB frames.  We arbitrarily pick fci->frame to point the same place
   as the register stack pointer; since we set it ourself in
   INIT_EXTRA_FRAME_INFO, and access it only through the FRAME_*
   macros, it doesn't really matter exactly how we
   do it.  However, note that FRAME_FP is used in two ways in GDB:
   (1) as a "magic cookie" which uniquely identifies frames (even over
   calls to the inferior), (2) (in PC_IN_CALL_DUMMY [ON_STACK])
   as the value of SP_REGNUM before the dummy frame was pushed.  These
   two meanings would be incompatible for the a29k if we defined
   CALL_DUMMY_LOCATION == ON_STACK (but we don't, so don't worry about it).
   Also note that "lr1" below, while called a frame pointer
   in the user's guide, has only one function:  To determine whether
   registers need to be filled in the function epilogue.

   Consider the code:
   < call bar>
   loc1: . . .
   bar:  sub gr1,gr1,rsize_b
   . . .
   add mfp,msp,0
   sub msp,msp,msize_b
   . . .
   < call foo >