/* Definitions to make GDB target for an ARM
   Copyright 1986, 1987, 1989, 1991, 1993, 1997, 1998 Free Software Foundation, Inc.

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.  */

#ifdef __STDC__		/* Forward decls for prototypes */
struct type;
struct value;
#endif

#define TARGET_BYTE_ORDER_SELECTABLE

/* IEEE format floating point */

#define IEEE_FLOAT

/* FIXME: may need a floatformat_ieee_double_bigbyte_littleword format for
   BIG_ENDIAN use. -fnf */

#define TARGET_DOUBLE_FORMAT (target_byte_order == BIG_ENDIAN \
			      ? &floatformat_ieee_double_big \
			      : &floatformat_ieee_double_littlebyte_bigword)

/* When reading symbols, we need to zap the low bit of the address, which
   may be set to 1 for Thumb functions.  */

#define SMASH_TEXT_ADDRESS(addr) ((addr) &= ~0x1)

/* Remove useless bits from addresses in a running program.  */

CORE_ADDR arm_addr_bits_remove PARAMS ((CORE_ADDR));

#define ADDR_BITS_REMOVE(val) (arm_addr_bits_remove (val))

/* 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.  */

extern CORE_ADDR arm_skip_prologue PARAMS ((CORE_ADDR pc));

#define SKIP_PROLOGUE(pc) { pc = arm_skip_prologue (pc); }

/* Immediately after a function call, return the saved pc.
   Can't always 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) arm_saved_pc_after_call (frame)
struct frame_info;
extern CORE_ADDR arm_saved_pc_after_call PARAMS ((struct frame_info *));

/* I don't know the real values for these.  */
#define TARGET_UPAGES UPAGES
#define TARGET_NBPG NBPG

/* Address of end of stack space.  */

#define STACK_END_ADDR (0x01000000 - (TARGET_UPAGES * TARGET_NBPG))

/* Stack grows downward.  */

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

/* !!!! if we're using RDP, then we're inserting breakpoints and storing
   their handles instread of what was in memory.  It is nice that
   this is the same size as a handle - otherwise remote-rdp will
   have to change. */

/* BREAKPOINT_FROM_PC uses the program counter value to determine whether a
   16- or 32-bit breakpoint should be used.  It returns a pointer
   to a string of bytes that encode a breakpoint instruction, stores
   the length of the string to *lenptr, and adjusts the pc (if necessary) to
   point to the actual memory location where the breakpoint should be
   inserted.  */

extern breakpoint_from_pc_fn arm_breakpoint_from_pc;
#define BREAKPOINT_FROM_PC(pcptr, lenptr) arm_breakpoint_from_pc (pcptr, lenptr)

/* 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

/* code to execute to print interesting information about the
 * floating point processor (if any)
 * No need to define if there is nothing to do.
 */
#define FLOAT_INFO { arm_float_info (); }

/* 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

/* Number of machine registers */

/* Note: I make a fake copy of the pc in register 25 (calling it ps) so
   that I can clear the status bits from pc (register 15) */

#define NUM_REGS 26

/* An array of names of registers. */

extern char **arm_register_names;
#define REGISTER_NAME(i) arm_register_names[i]

/* Register numbers of various important registers.
   Note that some of these values are "real" register numbers,
   and correspond to the general registers of the machine,
   and some are "phony" register numbers which are too large
   to be actual register numbers as far as the user is concerned
   but do serve to get the desired values when passed to read_register.  */

#define A1_REGNUM 0		/* first integer-like argument */
#define A4_REGNUM 3		/* last integer-like argument */
#define AP_REGNUM 11
#define FP_REGNUM 11		/* Contains address of executing stack frame */
#define SP_REGNUM 13		/* Contains address of top of stack */
#define LR_REGNUM 14		/* address to return to from a function call */
#define PC_REGNUM 15		/* Contains program counter */
#define F0_REGNUM 16		/* first floating point register */
#define F3_REGNUM 19		/* last floating point argument register */
#define F7_REGNUM 23		/* last floating point register */
#define FPS_REGNUM 24		/* floating point status register */
#define PS_REGNUM 25		/* Contains processor status */

#define THUMB_FP_REGNUM 7	/* R7 is frame register on Thumb */

#define ARM_NUM_ARG_REGS 	4
#define ARM_LAST_ARG_REGNUM 	A4_REGNUM
#define ARM_NUM_FP_ARG_REGS 	4
#define ARM_LAST_FP_ARG_REGNUM	F3_REGNUM

/* Instruction condition field values.  */
#define INST_EQ		0x0
#define INST_NE		0x1
#define INST_CS		0x2
#define INST_CC		0x3
#define INST_MI		0x4
#define INST_PL		0x5
#define INST_VS		0x6
#define INST_VC		0x7
#define INST_HI		0x8
#define INST_LS		0x9
#define INST_GE		0xa
#define INST_LT		0xb
#define INST_GT		0xc
#define INST_LE		0xd
#define INST_AL		0xe
#define INST_NV		0xf

#define FLAG_N		0x80000000
#define FLAG_Z		0x40000000
#define FLAG_C		0x20000000
#define FLAG_V		0x10000000



/* Total amount of space needed to store our copies of the machine's
   register state, the array `registers'.  */
#define REGISTER_BYTES (16*4 + 12*8 + 4 + 4)

/* Index within `registers' of the first byte of the space for
   register N.  */

#define REGISTER_BYTE(N) (((N) < F0_REGNUM) ? (N)*4 : \
			  (((N) < PS_REGNUM) ? 16*4 + ((N) - 16)*12 : \
			   16*4 + 8*12 + ((N) - FPS_REGNUM) * 4))

/* Number of bytes of storage in the actual machine representation
   for register N.  On the vax, all regs are 4 bytes.  */

#define REGISTER_RAW_SIZE(N) (((N) < F0_REGNUM || (N) >= FPS_REGNUM) ? 4 : 12)

/* Number of bytes of storage in the program's representation
   for register N.  On the vax, all regs are 4 bytes.  */

#define REGISTER_VIRTUAL_SIZE(N) (((N) < F0_REGNUM || (N) >= FPS_REGNUM) ? 4 : 8)

/* Largest value REGISTER_RAW_SIZE can have.  */

#define MAX_REGISTER_RAW_SIZE 12 

/* Largest value REGISTER_VIRTUAL_SIZE can have.  */

#define MAX_REGISTER_VIRTUAL_SIZE 8

/* Nonzero if register N requires conversion
   from raw format to virtual format.  */
#define REGISTER_CONVERTIBLE(N) ((unsigned)(N) - F0_REGNUM < 8)

/* Convert data from raw format for register REGNUM in buffer FROM
   to virtual format with type TYPE in buffer TO.  */

#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
{ \
  double val; \
  convert_from_extended ((FROM), & val); \
  store_floating ((TO), TYPE_LENGTH (TYPE), val); \
}

/* Convert data from virtual format with type TYPE in buffer FROM
   to raw format for register REGNUM in buffer TO.  */

#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO)	\
{ \
  double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
  convert_to_extended (&val, (TO)); \
}
/* Return the GDB type object for the "standard" data type
   of data in register N.  */

#define REGISTER_VIRTUAL_TYPE(N) \
 (((unsigned)(N) - F0_REGNUM) < 8 ? builtin_type_double : builtin_type_int)

/* The system C compiler uses a similar structure return convention to gcc */
extern use_struct_convention_fn arm_use_struct_convention;
#define USE_STRUCT_CONVENTION(gcc_p, type) arm_use_struct_convention (gcc_p, type)

/* Store the address of the place in which to copy the structure the
   subroutine will return.  This is called from call_function. */

#define STORE_STRUCT_RETURN(ADDR, SP) \
  { write_register (0, (ADDR)); }

/* 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) \
  if (TYPE_CODE (TYPE) == TYPE_CODE_FLT)				\
    convert_from_extended (REGBUF + REGISTER_BYTE (F0_REGNUM), VALBUF);	\
  else									\
    memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))

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

#define STORE_RETURN_VALUE(TYPE,VALBUF) \
  if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) {				\
    char _buf[MAX_REGISTER_RAW_SIZE];					\
    convert_to_extended (VALBUF, _buf); 					\
    write_register_bytes (REGISTER_BYTE (F0_REGNUM), _buf, MAX_REGISTER_RAW_SIZE); \
  } else								\
    write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))

/* Extract from an array REGBUF containing the (raw) register state
   the address in which a function should return its structure value,
   as a CORE_ADDR (or an expression that can be used as one).  */

#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))

/* Specify that for the native compiler variables for a particular
   lexical context are listed after the beginning LBRAC instead of
   before in the executables list of symbols.  */
#define VARIABLES_INSIDE_BLOCK(desc, gcc_p) (!(gcc_p))


/* Define other aspects of the stack frame. 
   We keep the offsets of all saved registers, 'cause we need 'em a lot!
   We also keep the current size of the stack frame, and the offset of
   the frame pointer from the stack pointer (for frameless functions, and
   when we're still in the prologue of a function with a frame) */

#define EXTRA_FRAME_INFO  	\
  struct frame_saved_regs fsr;	\
  int framesize;		\
  int frameoffset;		\
  int framereg;

extern void arm_init_extra_frame_info PARAMS ((struct frame_info *fi));
#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) arm_init_extra_frame_info (fi)

/* Return the frame address.  On ARM, it is R11; on Thumb it is R7.  */
CORE_ADDR arm_target_read_fp PARAMS ((void));
#define TARGET_READ_FP() arm_target_read_fp ()

/* Describe the pointer in each stack frame to the previous stack frame
   (its caller).  */

/* FRAME_CHAIN takes a frame's nominal address
   and produces the frame's chain-pointer.

   However, if FRAME_CHAIN_VALID returns zero,
   it means the given frame is the outermost one and has no caller.  */

#define FRAME_CHAIN(thisframe) (CORE_ADDR) arm_frame_chain (thisframe)
extern CORE_ADDR arm_frame_chain PARAMS ((struct frame_info *));

extern int arm_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *));
#define FRAME_CHAIN_VALID(chain, thisframe) arm_frame_chain_valid (chain, thisframe)

/* Define other aspects of the stack frame.  */

/* A macro that tells us whether the function invocation represented
   by FI does not have a frame on the stack associated with it.  If it
   does not, FRAMELESS is set to 1, else 0.  */
#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
{							\
  CORE_ADDR func_start, after_prologue;			\
  func_start = (get_pc_function_start ((FI)->pc) +	\
		FUNCTION_START_OFFSET);			\
  after_prologue = func_start;				\
  SKIP_PROLOGUE (after_prologue);			\
  (FRAMELESS) = (after_prologue == func_start);		\
}

/* Saved Pc.  */

#define FRAME_SAVED_PC(FRAME)	arm_frame_saved_pc (FRAME)
extern CORE_ADDR arm_frame_saved_pc PARAMS ((struct frame_info *));

#define FRAME_ARGS_ADDRESS(fi) (fi->frame)

#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)

/* Return number of args passed to a frame.
   Can return -1, meaning no way to tell.  */

#define FRAME_NUM_ARGS(numargs, fi) (numargs = -1)

/* Return number of bytes at start of arglist that are not really args.  */

#define FRAME_ARGS_SKIP 0

/* Put here the code to store, into a struct frame_saved_regs,
   the addresses of the saved registers of frame described by FRAME_INFO.
   This includes special registers such as pc and fp saved in special
   ways in the stack frame.  sp is even more special:
   the address we return for it IS the sp for the next frame.  */

struct frame_saved_regs;
struct frame_info;
void frame_find_saved_regs PARAMS((struct frame_info *fi,
				   struct frame_saved_regs *fsr));

#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 arm_frame_find_saved_regs (frame_info, &(frame_saved_regs));


/* Things needed for making the inferior call functions.  */

#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
    sp = arm_push_arguments ((nargs), (args), (sp), (struct_return), (struct_addr))
extern CORE_ADDR
arm_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int, CORE_ADDR));

/* Push an empty stack frame, to record the current PC, etc.  */

void arm_push_dummy_frame PARAMS ((void));

#define PUSH_DUMMY_FRAME arm_push_dummy_frame ()

/* Discard from the stack the innermost frame, restoring all registers.  */

void arm_pop_frame PARAMS ((void));

#define POP_FRAME arm_pop_frame ()

/* This sequence of words is the instructions

     mov 	lr,pc
     mov	pc,r4
     illegal

   Note this is 12 bytes.  */

#define CALL_DUMMY {0xe1a0e00f, 0xe1a0f004, 0xE7FFDEFE}

#define CALL_DUMMY_START_OFFSET 0  /* Start execution at beginning of dummy */

#define CALL_DUMMY_BREAKPOINT_OFFSET arm_call_dummy_breakpoint_offset()
extern int arm_call_dummy_breakpoint_offset PARAMS ((void));

/* Insert the specified number of args and function address
   into a call sequence of the above form stored at DUMMYNAME.  */

#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
   arm_fix_call_dummy (dummyname, pc, fun, nargs, args, type, gcc_p)

void arm_fix_call_dummy PARAMS ((char *dummy, CORE_ADDR pc, CORE_ADDR fun,
				 int nargs, struct value **args,
				 struct type *type, int gcc_p));

CORE_ADDR arm_get_next_pc PARAMS ((CORE_ADDR));

/* Functions for dealing with Thumb call thunks.  */
#define IN_SOLIB_CALL_TRAMPOLINE(pc, name)	arm_in_call_stub (pc, name)
#define SKIP_TRAMPOLINE_CODE(pc)		arm_skip_stub (pc)
extern int arm_in_call_stub PARAMS ((CORE_ADDR pc,  char *name));
extern CORE_ADDR arm_skip_stub PARAMS ((CORE_ADDR pc));

/* Function to determine whether MEMADDR is in a Thumb function.  */
extern int arm_pc_is_thumb PARAMS ((bfd_vma memaddr));

/* Function to determine whether MEMADDR is in a call dummy called from
   a Thumb function.  */
extern int arm_pc_is_thumb_dummy PARAMS ((bfd_vma memaddr));

/* Macros for setting and testing a bit in a minimal symbol that
   marks it as Thumb function.  The MSB of the minimal symbol's
   "info" field is used for this purpose. This field is already
   being used to store the symbol size, so the assumption is
   that the symbol size cannot exceed 2^31.
 
   COFF_MAKE_MSYMBOL_SPECIAL
   ELF_MAKE_MSYMBOL_SPECIAL	tests whether the COFF or ELF symbol corresponds 
                        to a thumb function, and sets a "special" bit in a
                        minimal symbol to indicate that it does
   MSYMBOL_SET_SPECIAL	actually sets the "special" bit
   MSYMBOL_IS_SPECIAL   tests the "special" bit in a minimal symbol
   MSYMBOL_SIZE         returns the size of the minimal symbol, i.e.
                        the "info" field with the "special" bit masked out
*/
 
extern int coff_sym_is_thumb(int val);
#define MSYMBOL_SET_SPECIAL(msym) \
    MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) | 0x80000000)
#define MSYMBOL_IS_SPECIAL(msym) \
  (((long) MSYMBOL_INFO (msym) & 0x80000000) != 0)
#define MSYMBOL_SIZE(msym) \
  ((long) MSYMBOL_INFO (msym) & 0x7fffffff)

/* Thumb symbol are of type STT_LOPROC, (synonymous with STT_ARM_TFUNC) */
#define ELF_MAKE_MSYMBOL_SPECIAL(sym,msym) \
 { if(ELF_ST_TYPE(((elf_symbol_type *)(sym))->internal_elf_sym.st_info) == STT_LOPROC) \
	MSYMBOL_SET_SPECIAL(msym); }
  
#define COFF_MAKE_MSYMBOL_SPECIAL(val,msym) \
 { if(coff_sym_is_thumb(val)) MSYMBOL_SET_SPECIAL(msym); }

#undef  IN_SIGTRAMP
#define IN_SIGTRAMP(pc, name) 0
