7f709ce739
The canonical way of dealing with Xtensa instructions decoding and encoding is through the libisa. Libisa is a configuration-independent library with a stable interface plus generated configuration-specific xtensa-modules.c file with implementations of decoding and encoding functions. Libisa is MIT-licensed and originally disributed xtensa-modules.c files are also MIT-licensed and are available as a part of xtensa configuration overlay. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
839 lines
26 KiB
C
839 lines
26 KiB
C
/* Interface definition for configurable Xtensa ISA support.
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*
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* Copyright (c) 2001-2013 Tensilica Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef XTENSA_LIBISA_H
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#define XTENSA_LIBISA_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Version number: This is intended to help support code that works with
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* versions of this library from multiple Xtensa releases.
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*/
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#define XTENSA_ISA_VERSION 7000
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/*
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* This file defines the interface to the Xtensa ISA library. This
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* library contains most of the ISA-specific information for a
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* particular Xtensa processor. For example, the set of valid
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* instructions, their opcode encodings and operand fields are all
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* included here.
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*
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* This interface basically defines a number of abstract data types.
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*
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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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* . instruction formats - instruction size and slot structure
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* . opcodes - information about individual instructions
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* . operands - information about register and immediate instruction operands
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* . stateOperands - information about processor state instruction operands
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* . interfaceOperands - information about interface instruction operands
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* . register files - register file information
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* . processor states - internal processor state information
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* . system registers - "special registers" and "user registers"
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* . interfaces - TIE interfaces that are external to the processor
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* . functional units - TIE shared functions
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*
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* The interface defines a set of functions to access each data type.
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* With the exception of the instruction buffer, the internal
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* representations of the data structures are hidden. All accesses must
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* be made through the functions defined here.
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*/
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typedef struct xtensa_isa_opaque { int unused; } *xtensa_isa;
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/*
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* Most of the Xtensa ISA entities (e.g., opcodes, regfiles, etc.) are
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* represented here using sequential integers beginning with 0. The
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* specific values are only fixed for a particular instantiation of an
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* xtensa_isa structure, so these values should only be used
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* internally.
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*/
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typedef int xtensa_opcode;
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typedef int xtensa_format;
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typedef int xtensa_regfile;
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typedef int xtensa_state;
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typedef int xtensa_sysreg;
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typedef int xtensa_interface;
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typedef int xtensa_funcUnit;
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/* Define a unique value for undefined items. */
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#define XTENSA_UNDEFINED -1
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/*
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* Overview of using this interface to decode/encode instructions:
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*
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* Each Xtensa instruction is associated with a particular instruction
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* format, where the format defines a fixed number of slots for
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* operations. The formats for the core Xtensa ISA have only one slot,
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* but FLIX instructions may have multiple slots. Within each slot,
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* there is a single opcode and some number of associated operands.
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*
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* The encoding and decoding functions operate on instruction buffers,
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* not on the raw bytes of the instructions. The same instruction
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* buffer data structure is used for both entire instructions and
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* individual slots in those instructions -- the contents of a slot need
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* to be extracted from or inserted into the buffer for the instruction
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* as a whole.
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*
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* Decoding an instruction involves first finding the format, which
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* identifies the number of slots, and then decoding each slot
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* separately. A slot is decoded by finding the opcode and then using
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* the opcode to determine how many operands there are. For example:
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*
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* xtensa_insnbuf_from_chars
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* xtensa_format_decode
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* for each slot {
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* xtensa_format_get_slot
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* xtensa_opcode_decode
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* for each operand {
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* xtensa_operand_get_field
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* xtensa_operand_decode
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* }
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* }
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*
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* Encoding an instruction is roughly the same procedure in reverse:
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*
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* xtensa_format_encode
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* for each slot {
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* xtensa_opcode_encode
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* for each operand {
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* xtensa_operand_encode
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* xtensa_operand_set_field
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* }
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* xtensa_format_set_slot
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* }
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* xtensa_insnbuf_to_chars
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*/
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/* Error handling. */
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/*
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* Error codes. The code for the most recent error condition can be
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* retrieved with the "errno" function. For any result other than
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* xtensa_isa_ok, an error message containing additional information
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* about the problem can be retrieved using the "error_msg" function.
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* The error messages are stored in an internal buffer, which should
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* not be freed and may be overwritten by subsequent operations.
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*/
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typedef enum xtensa_isa_status_enum {
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xtensa_isa_ok = 0,
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xtensa_isa_bad_format,
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xtensa_isa_bad_slot,
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xtensa_isa_bad_opcode,
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xtensa_isa_bad_operand,
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xtensa_isa_bad_field,
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xtensa_isa_bad_iclass,
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xtensa_isa_bad_regfile,
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xtensa_isa_bad_sysreg,
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xtensa_isa_bad_state,
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xtensa_isa_bad_interface,
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xtensa_isa_bad_funcUnit,
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xtensa_isa_wrong_slot,
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xtensa_isa_no_field,
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xtensa_isa_out_of_memory,
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xtensa_isa_buffer_overflow,
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xtensa_isa_internal_error,
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xtensa_isa_bad_value
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} xtensa_isa_status;
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xtensa_isa_status xtensa_isa_errno(xtensa_isa isa);
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char *xtensa_isa_error_msg(xtensa_isa isa);
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/* Instruction buffers. */
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typedef uint32_t xtensa_insnbuf_word;
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typedef xtensa_insnbuf_word *xtensa_insnbuf;
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/* Get the size in "insnbuf_words" of the xtensa_insnbuf array. */
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int xtensa_insnbuf_size(xtensa_isa isa);
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/* Allocate an xtensa_insnbuf of the right size. */
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xtensa_insnbuf xtensa_insnbuf_alloc(xtensa_isa isa);
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/* Release an xtensa_insnbuf. */
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void xtensa_insnbuf_free(xtensa_isa isa, xtensa_insnbuf buf);
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/*
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* Conversion between raw memory (char arrays) and our internal
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* instruction representation. This is complicated by the Xtensa ISA's
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* variable instruction lengths. When converting to chars, the buffer
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* must contain a valid instruction so we know how many bytes to copy;
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* thus, the "to_chars" function returns the number of bytes copied or
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* XTENSA_UNDEFINED on error. The "from_chars" function first reads the
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* minimal number of bytes required to decode the instruction length and
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* then proceeds to copy the entire instruction into the buffer; if the
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* memory does not contain a valid instruction, it copies the maximum
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* number of bytes required for the longest Xtensa instruction. The
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* "num_chars" argument may be used to limit the number of bytes that
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* can be read or written. Otherwise, if "num_chars" is zero, the
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* functions may read or write past the end of the code.
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*/
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int xtensa_insnbuf_to_chars(xtensa_isa isa, const xtensa_insnbuf insn,
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unsigned char *cp, int num_chars);
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void xtensa_insnbuf_from_chars(xtensa_isa isa, xtensa_insnbuf insn,
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const unsigned char *cp, int num_chars);
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/* ISA information. */
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/* Initialize the ISA information. */
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xtensa_isa xtensa_isa_init(void *xtensa_modules, xtensa_isa_status *errno_p,
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char **error_msg_p);
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/* Deallocate an xtensa_isa structure. */
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void xtensa_isa_free(xtensa_isa isa);
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/* Get the maximum instruction size in bytes. */
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int xtensa_isa_maxlength(xtensa_isa isa);
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/*
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* Decode the length in bytes of an instruction in raw memory (not an
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* insnbuf). This function reads only the minimal number of bytes
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* required to decode the instruction length. Returns
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* XTENSA_UNDEFINED on error.
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*/
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int xtensa_isa_length_from_chars(xtensa_isa isa, const unsigned char *cp);
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/*
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* Get the number of stages in the processor's pipeline. The pipeline
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* stage values returned by other functions in this library will range
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* from 0 to N-1, where N is the value returned by this function.
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* Note that the stage numbers used here may not correspond to the
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* actual processor hardware, e.g., the hardware may have additional
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* stages before stage 0. Returns XTENSA_UNDEFINED on error.
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*/
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int xtensa_isa_num_pipe_stages(xtensa_isa isa);
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/* Get the number of various entities that are defined for this processor. */
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int xtensa_isa_num_formats(xtensa_isa isa);
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int xtensa_isa_num_opcodes(xtensa_isa isa);
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int xtensa_isa_num_regfiles(xtensa_isa isa);
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int xtensa_isa_num_states(xtensa_isa isa);
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int xtensa_isa_num_sysregs(xtensa_isa isa);
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int xtensa_isa_num_interfaces(xtensa_isa isa);
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int xtensa_isa_num_funcUnits(xtensa_isa isa);
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/* Instruction formats. */
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/* Get the name of a format. Returns null on error. */
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const char *xtensa_format_name(xtensa_isa isa, xtensa_format fmt);
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/*
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* Given a format name, return the format number. Returns
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* XTENSA_UNDEFINED if the name is not a valid format.
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*/
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xtensa_format xtensa_format_lookup(xtensa_isa isa, const char *fmtname);
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/*
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* Decode the instruction format from a binary instruction buffer.
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* Returns XTENSA_UNDEFINED if the format is not recognized.
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*/
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xtensa_format xtensa_format_decode(xtensa_isa isa, const xtensa_insnbuf insn);
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/*
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* Set the instruction format field(s) in a binary instruction buffer.
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* All the other fields are set to zero. Returns non-zero on error.
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*/
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int xtensa_format_encode(xtensa_isa isa, xtensa_format fmt,
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xtensa_insnbuf insn);
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/*
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* Find the length (in bytes) of an instruction. Returns
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* XTENSA_UNDEFINED on error.
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*/
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int xtensa_format_length(xtensa_isa isa, xtensa_format fmt);
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/*
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* Get the number of slots in an instruction. Returns XTENSA_UNDEFINED
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* on error.
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*/
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int xtensa_format_num_slots(xtensa_isa isa, xtensa_format fmt);
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/*
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* Get the opcode for a no-op in a particular slot.
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* Returns XTENSA_UNDEFINED on error.
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*/
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xtensa_opcode xtensa_format_slot_nop_opcode(xtensa_isa isa, xtensa_format fmt,
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int slot);
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/*
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* Get the bits for a specified slot out of an insnbuf for the
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* instruction as a whole and put them into an insnbuf for that one
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* slot, and do the opposite to set a slot. Return non-zero on error.
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*/
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int xtensa_format_get_slot(xtensa_isa isa, xtensa_format fmt, int slot,
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const xtensa_insnbuf insn, xtensa_insnbuf slotbuf);
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int xtensa_format_set_slot(xtensa_isa isa, xtensa_format fmt, int slot,
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xtensa_insnbuf insn, const xtensa_insnbuf slotbuf);
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/* Opcode information. */
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/*
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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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*/
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xtensa_opcode xtensa_opcode_lookup(xtensa_isa isa, const char *opname);
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/*
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* Decode the opcode for one instruction slot from a binary instruction
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* buffer. Returns the opcode or XTENSA_UNDEFINED if the opcode is
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* illegal.
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*/
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xtensa_opcode xtensa_opcode_decode(xtensa_isa isa, xtensa_format fmt, int slot,
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const xtensa_insnbuf slotbuf);
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/*
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* Set the opcode field(s) for an instruction slot. All other fields
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* in the slot are set to zero. Returns non-zero if the opcode cannot
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* be encoded.
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*/
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int xtensa_opcode_encode(xtensa_isa isa, xtensa_format fmt, int slot,
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xtensa_insnbuf slotbuf, xtensa_opcode opc);
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/* Get the mnemonic name for an opcode. Returns null on error. */
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const char *xtensa_opcode_name(xtensa_isa isa, xtensa_opcode opc);
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/* Check various properties of opcodes. These functions return 0 if
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* the condition is false, 1 if the condition is true, and
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* XTENSA_UNDEFINED on error. The instructions are classified as
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* follows:
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*
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* branch: conditional branch; may fall through to next instruction (B*)
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* jump: unconditional branch (J, JX, RET*, RF*)
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* loop: zero-overhead loop (LOOP*)
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* call: unconditional call; control returns to next instruction (CALL*)
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*
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* For the opcodes that affect control flow in some way, the branch
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* target may be specified by an immediate operand or it may be an
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* address stored in a register. You can distinguish these by
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* checking if the instruction has a PC-relative immediate
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* operand.
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*/
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int xtensa_opcode_is_branch(xtensa_isa isa, xtensa_opcode opc);
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int xtensa_opcode_is_jump(xtensa_isa isa, xtensa_opcode opc);
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int xtensa_opcode_is_loop(xtensa_isa isa, xtensa_opcode opc);
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int xtensa_opcode_is_call(xtensa_isa isa, xtensa_opcode opc);
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/*
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* Find the number of ordinary operands, state operands, and interface
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* operands for an instruction. These return XTENSA_UNDEFINED on
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* error.
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*/
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int xtensa_opcode_num_operands(xtensa_isa isa, xtensa_opcode opc);
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int xtensa_opcode_num_stateOperands(xtensa_isa isa, xtensa_opcode opc);
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int xtensa_opcode_num_interfaceOperands(xtensa_isa isa, xtensa_opcode opc);
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/*
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* Get functional unit usage requirements for an opcode. Each "use"
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* is identified by a <functional unit, pipeline stage> pair. The
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* "num_funcUnit_uses" function returns the number of these "uses" or
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* XTENSA_UNDEFINED on error. The "funcUnit_use" function returns
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* a pointer to a "use" pair or null on error.
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*/
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typedef struct xtensa_funcUnit_use_struct {
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xtensa_funcUnit unit;
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int stage;
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} xtensa_funcUnit_use;
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int xtensa_opcode_num_funcUnit_uses(xtensa_isa isa, xtensa_opcode opc);
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xtensa_funcUnit_use *xtensa_opcode_funcUnit_use(xtensa_isa isa,
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xtensa_opcode opc, int u);
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/* Operand information. */
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/* Get the name of an operand. Returns null on error. */
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const char *xtensa_operand_name(xtensa_isa isa, xtensa_opcode opc, int opnd);
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/*
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* Some operands are "invisible", i.e., not explicitly specified in
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* assembly language. When assembling an instruction, you need not set
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* the values of invisible operands, since they are either hardwired or
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* derived from other field values. The values of invisible operands
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* can be examined in the same way as other operands, but remember that
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* an invisible operand may get its value from another visible one, so
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* the entire instruction must be available before examining the
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* invisible operand values. This function returns 1 if an operand is
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* visible, 0 if it is invisible, or XTENSA_UNDEFINED on error. Note
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* that whether an operand is visible is orthogonal to whether it is
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* "implicit", i.e., whether it is encoded in a field in the
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* instruction.
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*/
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int xtensa_operand_is_visible(xtensa_isa isa, xtensa_opcode opc, int opnd);
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/*
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* Check if an operand is an input ('i'), output ('o'), or inout ('m')
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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 ('m') even if it is declared
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* in the TIE code as an output ('o'); this allows the compiler to
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* properly handle register allocation for conditional assignments.
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* Returns 0 on error.
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*/
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char xtensa_operand_inout(xtensa_isa isa, xtensa_opcode opc, int opnd);
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/*
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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. Both of these
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* functions return non-zero on error, e.g., if the field is not defined
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* for the specified slot.
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*/
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int xtensa_operand_get_field(xtensa_isa isa, xtensa_opcode opc, int opnd,
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xtensa_format fmt, int slot,
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const xtensa_insnbuf slotbuf, uint32_t *valp);
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int xtensa_operand_set_field(xtensa_isa isa, xtensa_opcode opc, int opnd,
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xtensa_format fmt, int slot,
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xtensa_insnbuf slotbuf, uint32_t val);
|
|
|
|
|
|
/*
|
|
* Encode and decode operands. The raw bits in the operand field may
|
|
* be encoded in a variety of different ways. These functions hide
|
|
* the details of that encoding. The result values are returned through
|
|
* the argument pointer. The return value is non-zero on error.
|
|
*/
|
|
|
|
int xtensa_operand_encode(xtensa_isa isa, xtensa_opcode opc, int opnd,
|
|
uint32_t *valp);
|
|
|
|
int xtensa_operand_decode(xtensa_isa isa, xtensa_opcode opc, int opnd,
|
|
uint32_t *valp);
|
|
|
|
|
|
/*
|
|
* An operand may be either a register operand or an immediate of some
|
|
* sort (e.g., PC-relative or not). The "is_register" function returns
|
|
* 0 if the operand is an immediate, 1 if it is a register, and
|
|
* XTENSA_UNDEFINED on error. The "regfile" function returns the
|
|
* regfile for a register operand, or XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
int xtensa_operand_is_register(xtensa_isa isa, xtensa_opcode opc, int opnd);
|
|
|
|
xtensa_regfile xtensa_operand_regfile(xtensa_isa isa, xtensa_opcode opc,
|
|
int opnd);
|
|
|
|
|
|
/*
|
|
* Register operands may span multiple consecutive registers, e.g., a
|
|
* 64-bit data type may occupy two 32-bit registers. Only the first
|
|
* register is encoded in the operand field. This function specifies
|
|
* the number of consecutive registers occupied by this operand. For
|
|
* non-register operands, the return value is undefined. Returns
|
|
* XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
int xtensa_operand_num_regs(xtensa_isa isa, xtensa_opcode opc, int opnd);
|
|
|
|
|
|
/*
|
|
* Some register operands do not completely identify the register being
|
|
* accessed. For example, the operand value may be added to an internal
|
|
* state value. By definition, this implies that the corresponding
|
|
* regfile is not allocatable. Unknown registers should generally be
|
|
* treated with worst-case assumptions. The function returns 0 if the
|
|
* register value is unknown, 1 if known, and XTENSA_UNDEFINED on
|
|
* error.
|
|
*/
|
|
|
|
int xtensa_operand_is_known_reg(xtensa_isa isa, xtensa_opcode opc, int opnd);
|
|
|
|
|
|
/*
|
|
* Check if an immediate operand is PC-relative. Returns 0 for register
|
|
* operands and non-PC-relative immediates, 1 for PC-relative
|
|
* immediates, and XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
int xtensa_operand_is_PCrelative(xtensa_isa isa, xtensa_opcode opc, int opnd);
|
|
|
|
|
|
/*
|
|
* For PC-relative offset operands, the interpretation of the offset may
|
|
* vary between opcodes, e.g., is it relative to the current PC or that
|
|
* of the next instruction? The following functions are defined to
|
|
* perform PC-relative relocations and to undo them (as in the
|
|
* disassembler). The "do_reloc" function takes the desired address
|
|
* value and the PC of the current instruction and sets the value to the
|
|
* corresponding PC-relative offset (which can then be encoded and
|
|
* stored into the operand field). The "undo_reloc" function takes the
|
|
* unencoded offset value and the current PC and sets the value to the
|
|
* appropriate address. The return values are non-zero on error. Note
|
|
* that these functions do not replace the encode/decode functions; the
|
|
* operands must be encoded/decoded separately and the encode functions
|
|
* are responsible for detecting invalid operand values.
|
|
*/
|
|
|
|
int xtensa_operand_do_reloc(xtensa_isa isa, xtensa_opcode opc, int opnd,
|
|
uint32_t *valp, uint32_t pc);
|
|
|
|
int xtensa_operand_undo_reloc(xtensa_isa isa, xtensa_opcode opc, int opnd,
|
|
uint32_t *valp, uint32_t pc);
|
|
|
|
|
|
|
|
/* State Operands. */
|
|
|
|
/*
|
|
* Get the state accessed by a state operand. Returns XTENSA_UNDEFINED
|
|
* on error.
|
|
*/
|
|
|
|
xtensa_state xtensa_stateOperand_state(xtensa_isa isa, xtensa_opcode opc,
|
|
int stOp);
|
|
|
|
|
|
/*
|
|
* Check if a state operand is an input ('i'), output ('o'), or inout
|
|
* ('m') operand. Returns 0 on error.
|
|
*/
|
|
|
|
char xtensa_stateOperand_inout(xtensa_isa isa, xtensa_opcode opc, int stOp);
|
|
|
|
|
|
|
|
/* Interface Operands. */
|
|
|
|
/*
|
|
* Get the external interface accessed by an interface operand.
|
|
* Returns XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
xtensa_interface xtensa_interfaceOperand_interface(xtensa_isa isa,
|
|
xtensa_opcode opc,
|
|
int ifOp);
|
|
|
|
|
|
|
|
/* Register Files. */
|
|
|
|
/*
|
|
* Regfiles include both "real" regfiles and "views", where a view
|
|
* allows a group of adjacent registers in a real "parent" regfile to be
|
|
* viewed as a single register. A regfile view has all the same
|
|
* properties as its parent except for its (long) name, bit width, number
|
|
* of entries, and default ctype. You can use the parent function to
|
|
* distinguish these two classes.
|
|
*/
|
|
|
|
/*
|
|
* Look up a regfile by either its name or its abbreviated "short name".
|
|
* Returns XTENSA_UNDEFINED on error. The "lookup_shortname" function
|
|
* ignores "view" regfiles since they always have the same shortname as
|
|
* their parents.
|
|
*/
|
|
|
|
xtensa_regfile xtensa_regfile_lookup(xtensa_isa isa, const char *name);
|
|
|
|
xtensa_regfile xtensa_regfile_lookup_shortname(xtensa_isa isa,
|
|
const char *shortname);
|
|
|
|
|
|
/*
|
|
* Get the name or abbreviated "short name" of a regfile.
|
|
* Returns null on error.
|
|
*/
|
|
|
|
const char *xtensa_regfile_name(xtensa_isa isa, xtensa_regfile rf);
|
|
|
|
const char *xtensa_regfile_shortname(xtensa_isa isa, xtensa_regfile rf);
|
|
|
|
|
|
/*
|
|
* Get the parent regfile of a "view" regfile. If the regfile is not a
|
|
* view, the result is the same as the input parameter. Returns
|
|
* XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
xtensa_regfile xtensa_regfile_view_parent(xtensa_isa isa, xtensa_regfile rf);
|
|
|
|
|
|
/*
|
|
* Get the bit width of a regfile or regfile view.
|
|
* Returns XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
int xtensa_regfile_num_bits(xtensa_isa isa, xtensa_regfile rf);
|
|
|
|
|
|
/*
|
|
* Get the number of regfile entries. Returns XTENSA_UNDEFINED on
|
|
* error.
|
|
*/
|
|
|
|
int xtensa_regfile_num_entries(xtensa_isa isa, xtensa_regfile rf);
|
|
|
|
|
|
|
|
/* Processor States. */
|
|
|
|
/* Look up a state by name. Returns XTENSA_UNDEFINED on error. */
|
|
|
|
xtensa_state xtensa_state_lookup(xtensa_isa isa, const char *name);
|
|
|
|
|
|
/* Get the name for a processor state. Returns null on error. */
|
|
|
|
const char *xtensa_state_name(xtensa_isa isa, xtensa_state st);
|
|
|
|
|
|
/*
|
|
* Get the bit width for a processor state.
|
|
* Returns XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
int xtensa_state_num_bits(xtensa_isa isa, xtensa_state st);
|
|
|
|
|
|
/*
|
|
* Check if a state is exported from the processor core. Returns 0 if
|
|
* the condition is false, 1 if the condition is true, and
|
|
* XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
int xtensa_state_is_exported(xtensa_isa isa, xtensa_state st);
|
|
|
|
|
|
/*
|
|
* Check for a "shared_or" state. Returns 0 if the condition is false,
|
|
* 1 if the condition is true, and XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
int xtensa_state_is_shared_or(xtensa_isa isa, xtensa_state st);
|
|
|
|
|
|
|
|
/* Sysregs ("special registers" and "user registers"). */
|
|
|
|
/*
|
|
* Look up a register by its number and whether it is a "user register"
|
|
* or a "special register". Returns XTENSA_UNDEFINED if the sysreg does
|
|
* not exist.
|
|
*/
|
|
|
|
xtensa_sysreg xtensa_sysreg_lookup(xtensa_isa isa, int num, int is_user);
|
|
|
|
|
|
/*
|
|
* Check if there exists a sysreg with a given name.
|
|
* If not, this function returns XTENSA_UNDEFINED.
|
|
*/
|
|
|
|
xtensa_sysreg xtensa_sysreg_lookup_name(xtensa_isa isa, const char *name);
|
|
|
|
|
|
/* Get the name of a sysreg. Returns null on error. */
|
|
|
|
const char *xtensa_sysreg_name(xtensa_isa isa, xtensa_sysreg sysreg);
|
|
|
|
|
|
/* Get the register number. Returns XTENSA_UNDEFINED on error. */
|
|
|
|
int xtensa_sysreg_number(xtensa_isa isa, xtensa_sysreg sysreg);
|
|
|
|
|
|
/*
|
|
* Check if a sysreg is a "special register" or a "user register".
|
|
* Returns 0 for special registers, 1 for user registers and
|
|
* XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
int xtensa_sysreg_is_user(xtensa_isa isa, xtensa_sysreg sysreg);
|
|
|
|
|
|
|
|
/* Interfaces. */
|
|
|
|
/*
|
|
* Find an interface by name. The return value is XTENSA_UNDEFINED if
|
|
* the specified interface is not found.
|
|
*/
|
|
|
|
xtensa_interface xtensa_interface_lookup(xtensa_isa isa, const char *ifname);
|
|
|
|
|
|
/* Get the name of an interface. Returns null on error. */
|
|
|
|
const char *xtensa_interface_name(xtensa_isa isa, xtensa_interface intf);
|
|
|
|
|
|
/*
|
|
* Get the bit width for an interface.
|
|
* Returns XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
int xtensa_interface_num_bits(xtensa_isa isa, xtensa_interface intf);
|
|
|
|
|
|
/*
|
|
* Check if an interface is an input ('i') or output ('o') with respect
|
|
* to the Xtensa processor core. Returns 0 on error.
|
|
*/
|
|
|
|
char xtensa_interface_inout(xtensa_isa isa, xtensa_interface intf);
|
|
|
|
|
|
/*
|
|
* Check if accessing an interface has potential side effects.
|
|
* Currently "data" interfaces have side effects and "control"
|
|
* interfaces do not. Returns 1 if there are side effects, 0 if not,
|
|
* and XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
int xtensa_interface_has_side_effect(xtensa_isa isa, xtensa_interface intf);
|
|
|
|
|
|
/*
|
|
* Some interfaces may be related such that accessing one interface
|
|
* has side effects on a set of related interfaces. The interfaces
|
|
* are partitioned into equivalence classes of related interfaces, and
|
|
* each class is assigned a unique identifier number. This function
|
|
* returns the class identifier for an interface, or XTENSA_UNDEFINED
|
|
* on error. These identifiers can be compared to determine if two
|
|
* interfaces are related; the specific values of the identifiers have
|
|
* no particular meaning otherwise.
|
|
*/
|
|
|
|
int xtensa_interface_class_id(xtensa_isa isa, xtensa_interface intf);
|
|
|
|
|
|
/* Functional Units. */
|
|
|
|
/*
|
|
* Find a functional unit by name. The return value is XTENSA_UNDEFINED if
|
|
* the specified unit is not found.
|
|
*/
|
|
|
|
xtensa_funcUnit xtensa_funcUnit_lookup(xtensa_isa isa, const char *fname);
|
|
|
|
|
|
/* Get the name of a functional unit. Returns null on error. */
|
|
|
|
const char *xtensa_funcUnit_name(xtensa_isa isa, xtensa_funcUnit fun);
|
|
|
|
|
|
/*
|
|
* Functional units may be replicated. See how many instances of a
|
|
* particular function unit exist. Returns XTENSA_UNDEFINED on error.
|
|
*/
|
|
|
|
int xtensa_funcUnit_num_copies(xtensa_isa isa, xtensa_funcUnit fun);
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#endif /* XTENSA_LIBISA_H */
|