231 lines
		
	
	
		
			9.2 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			231 lines
		
	
	
		
			9.2 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
/* Interface definition for configurable Xtensa ISA support.
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   Copyright 2003 Free Software Foundation, Inc.
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   This file is part of BFD, the Binary File Descriptor library.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
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#ifndef XTENSA_LIBISA_H
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#define XTENSA_LIBISA_H
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/* Use the statically-linked version for the GNU tools.  */
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#define STATIC_LIBISA 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef uint32
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#define uint32 unsigned int
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#endif
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/* This file defines the interface to the Xtensa ISA library.  This library
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   contains most of the ISA-specific information for a particular Xtensa
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   processor.  For example, the set of valid instructions, their opcode
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   encodings and operand fields are all included here.  To support Xtensa's
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   configurability and user-defined instruction extensions (i.e., TIE), the
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   library is initialized by loading one or more dynamic libraries; only a
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   small set of interface code is present in the statically-linked portion
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   of the library.
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   This interface basically defines four abstract data types.
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   . an instruction buffer - for holding the raw instruction bits
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   . ISA info - information about the ISA as a whole
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   . opcode info - information about individual instructions
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   . operand info - information about specific instruction operands
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   It would be nice to implement these as classes in C++, but the library is
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   implemented in C to match the expectations of the GNU tools.
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   Instead, the interface defines a set of functions to access each data
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   type.  With the exception of the instruction buffer, the internal
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   representations of the data structures are hidden.  All accesses must be
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   made through the functions defined here.  */
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typedef void* xtensa_isa;
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typedef void* xtensa_operand;
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/* Opcodes are represented here using sequential integers beginning with 0.
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   The specific value used for a particular opcode is only fixed for a
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   particular instantiation of an xtensa_isa structure, so these values
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   should only be used internally.  */
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typedef int xtensa_opcode;
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/* Define a unique value for undefined opcodes ("static const int" doesn't
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   seem to work for this because EGCS 1.0.3 on i686-Linux without -O won't
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   allow it to be used as an initializer).  */
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#define XTENSA_UNDEFINED -1
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typedef int libisa_module_specifier;
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extern xtensa_isa xtensa_isa_init (void);
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/* Instruction buffers.  */
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typedef uint32 xtensa_insnbuf_word;
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typedef xtensa_insnbuf_word *xtensa_insnbuf;
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/* Get the size in words of the xtensa_insnbuf array.  */
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extern int xtensa_insnbuf_size (xtensa_isa); 
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/* Allocate (with malloc) an xtensa_insnbuf of the right size.  */
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extern xtensa_insnbuf xtensa_insnbuf_alloc (xtensa_isa);
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/* Release (with free) an xtensa_insnbuf of the right size.  */
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extern void xtensa_insnbuf_free (xtensa_insnbuf);
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/* Inward and outward conversion from memory images (byte streams) to our
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   internal instruction representation.  */
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extern void xtensa_insnbuf_to_chars (xtensa_isa, const xtensa_insnbuf,
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				     char *);
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extern void xtensa_insnbuf_from_chars (xtensa_isa, xtensa_insnbuf,
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				       const char *);
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/* ISA information.  */
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/* Load the ISA information from a shared library.  If successful, this returns
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   a value which identifies the ISA for use in subsequent calls to the ISA
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   library; otherwise, it returns NULL.  Multiple ISAs can be loaded to support
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   heterogeneous multiprocessor systems.  */
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extern xtensa_isa xtensa_load_isa (libisa_module_specifier);
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/* Extend an existing set of ISA information by loading an additional shared
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   library of ISA information.  This is primarily intended for loading TIE
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   extensions.  If successful, the return value is non-zero.  */
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extern int xtensa_extend_isa (xtensa_isa, libisa_module_specifier);
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/* The default ISA.  This variable is set automatically to the ISA most
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   recently loaded and is provided as a convenience.  An exception is the GNU
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   opcodes library, where there is a fixed interface that does not allow
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   passing the ISA as a parameter and the ISA must be taken from this global
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   variable.  (Note: Since this variable is just a convenience, it is not
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   exported when libisa is built as a DLL, due to the hassle of dealing with
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   declspecs.)  */
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extern xtensa_isa xtensa_default_isa;
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/* Deallocate an xtensa_isa structure.  */
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extern void xtensa_isa_free (xtensa_isa);
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/* Get the maximum instruction size in bytes.  */
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extern int xtensa_insn_maxlength (xtensa_isa); 
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/* Get the total number of opcodes for this processor.  */
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extern int xtensa_num_opcodes (xtensa_isa);
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/* Translate a mnemonic name to an opcode.  Returns XTENSA_UNDEFINED if
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   the name is not a valid opcode mnemonic.  */
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extern xtensa_opcode xtensa_opcode_lookup (xtensa_isa, const char *);
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/* Decode a binary instruction buffer.  Returns the opcode or
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   XTENSA_UNDEFINED if the instruction is illegal.  */
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extern xtensa_opcode xtensa_decode_insn (xtensa_isa, const xtensa_insnbuf);
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/* Opcode information.  */
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/* Set the opcode field(s) in a binary instruction buffer.  The operand
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   fields are set to zero.  */
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extern void xtensa_encode_insn (xtensa_isa, xtensa_opcode, xtensa_insnbuf);
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/* Get the mnemonic name for an opcode.  */
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extern const char * xtensa_opcode_name (xtensa_isa, xtensa_opcode);
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/* Find the length (in bytes) of an instruction.  */
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extern int xtensa_insn_length (xtensa_isa, xtensa_opcode);
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/* Find the length of an instruction by looking only at the first byte.  */
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extern int xtensa_insn_length_from_first_byte (xtensa_isa, char);
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/* Find the number of operands for an instruction.  */
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extern int xtensa_num_operands (xtensa_isa, xtensa_opcode);
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/* Get the information about operand number "opnd" of a particular opcode.  */
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extern xtensa_operand xtensa_get_operand (xtensa_isa, xtensa_opcode, int);
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/* Operand information.  */
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/* Find the kind of operand.  There are three possibilities:
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   1) PC-relative immediates (e.g., "l", "L").  These can be identified with
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      the xtensa_operand_isPCRelative function.
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   2) non-PC-relative immediates ("i").
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   3) register-file short names (e.g., "a", "b", "m" and others defined
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      via TIE).  */
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extern char * xtensa_operand_kind (xtensa_operand);
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/* Check if an operand is an input ('<'), output ('>'), or inout ('=')
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   operand.  Note: The output operand of a conditional assignment
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   (e.g., movnez) appears here as an inout ('=') even if it is declared
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   in the TIE code as an output ('>'); this allows the compiler to
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   properly handle register allocation for conditional assignments.  */
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extern char xtensa_operand_inout (xtensa_operand);
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/* Get and set the raw (encoded) value of the field for the specified
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   operand.  The "set" function does not check if the value fits in the
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   field; that is done by the "encode" function below.  */
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extern uint32 xtensa_operand_get_field (xtensa_operand, const xtensa_insnbuf);
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extern void xtensa_operand_set_field (xtensa_operand, xtensa_insnbuf, uint32);
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/* Encode and decode operands.  The raw bits in the operand field
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   may be encoded in a variety of different ways.  These functions hide the
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   details of that encoding.  The encode function has a special return type
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   (xtensa_encode_result) to indicate success or the reason for failure; the
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   encoded value is returned through the argument pointer.  The decode function
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   has no possibility of failure and returns the decoded value.  */
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typedef enum
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{
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  xtensa_encode_result_ok,
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  xtensa_encode_result_align,
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  xtensa_encode_result_not_in_table,
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  xtensa_encode_result_too_low,
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  xtensa_encode_result_too_high,
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  xtensa_encode_result_not_ok,
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  xtensa_encode_result_max = xtensa_encode_result_not_ok
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} xtensa_encode_result;
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extern xtensa_encode_result xtensa_operand_encode (xtensa_operand, uint32 *);
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extern uint32 xtensa_operand_decode (xtensa_operand, uint32);
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/* For PC-relative offset operands, the interpretation of the offset may vary
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   between opcodes, e.g., is it relative to the current PC or that of the next
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   instruction?  The following functions are defined to perform PC-relative
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   relocations and to undo them (as in the disassembler).  The first function
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   takes the desired address and the PC of the current instruction and returns
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   the unencoded value to be stored in the offset field.  The second function
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   takes the unencoded offset value and the current PC and returns the address.
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   Note that these functions do not replace the encode/decode functions; the
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   operands must be encoded/decoded separately.  */
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extern int xtensa_operand_isPCRelative (xtensa_operand);
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extern uint32 xtensa_operand_do_reloc (xtensa_operand, uint32, uint32);
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extern uint32 xtensa_operand_undo_reloc	(xtensa_operand, uint32, uint32);
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#ifdef __cplusplus
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}
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#endif
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#endif /* XTENSA_LIBISA_H */
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