| /* Interface definition for configurable Xtensa ISA support. |
| Copyright (C) 2003-2024 Free Software Foundation, Inc. |
| |
| This file is part of BFD, the Binary File Descriptor library. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, |
| USA. */ |
| |
| #ifndef XTENSA_LIBISA_H |
| #define XTENSA_LIBISA_H |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* Version number: This is intended to help support code that works with |
| versions of this library from multiple Xtensa releases. */ |
| |
| #define XTENSA_ISA_VERSION 7000 |
| |
| #ifndef uint32 |
| #define uint32 unsigned int |
| #endif |
| |
| /* This file defines the interface to the Xtensa ISA library. This |
| library contains most of the ISA-specific information for a |
| particular Xtensa processor. For example, the set of valid |
| instructions, their opcode encodings and operand fields are all |
| included here. |
| |
| This interface basically defines a number of abstract data types. |
| |
| . an instruction buffer - for holding the raw instruction bits |
| . ISA info - information about the ISA as a whole |
| . instruction formats - instruction size and slot structure |
| . opcodes - information about individual instructions |
| . operands - information about register and immediate instruction operands |
| . stateOperands - information about processor state instruction operands |
| . interfaceOperands - information about interface instruction operands |
| . register files - register file information |
| . processor states - internal processor state information |
| . system registers - "special registers" and "user registers" |
| . interfaces - TIE interfaces that are external to the processor |
| . functional units - TIE shared functions |
| |
| The interface defines a set of functions to access each data type. |
| With the exception of the instruction buffer, the internal |
| representations of the data structures are hidden. All accesses must |
| be made through the functions defined here. */ |
| |
| typedef struct xtensa_isa_opaque { int unused; } *xtensa_isa; |
| |
| |
| /* Most of the Xtensa ISA entities (e.g., opcodes, regfiles, etc.) are |
| represented here using sequential integers beginning with 0. The |
| specific values are only fixed for a particular instantiation of an |
| xtensa_isa structure, so these values should only be used |
| internally. */ |
| |
| typedef int xtensa_opcode; |
| typedef int xtensa_format; |
| typedef int xtensa_regfile; |
| typedef int xtensa_state; |
| typedef int xtensa_sysreg; |
| typedef int xtensa_interface; |
| typedef int xtensa_funcUnit; |
| |
| |
| /* Define a unique value for undefined items. */ |
| |
| #define XTENSA_UNDEFINED -1 |
| |
| |
| /* Overview of using this interface to decode/encode instructions: |
| |
| Each Xtensa instruction is associated with a particular instruction |
| format, where the format defines a fixed number of slots for |
| operations. The formats for the core Xtensa ISA have only one slot, |
| but FLIX instructions may have multiple slots. Within each slot, |
| there is a single opcode and some number of associated operands. |
| |
| The encoding and decoding functions operate on instruction buffers, |
| not on the raw bytes of the instructions. The same instruction |
| buffer data structure is used for both entire instructions and |
| individual slots in those instructions -- the contents of a slot need |
| to be extracted from or inserted into the buffer for the instruction |
| as a whole. |
| |
| Decoding an instruction involves first finding the format, which |
| identifies the number of slots, and then decoding each slot |
| separately. A slot is decoded by finding the opcode and then using |
| the opcode to determine how many operands there are. For example: |
| |
| xtensa_insnbuf_from_chars |
| xtensa_format_decode |
| for each slot { |
| xtensa_format_get_slot |
| xtensa_opcode_decode |
| for each operand { |
| xtensa_operand_get_field |
| xtensa_operand_decode |
| } |
| } |
| |
| Encoding an instruction is roughly the same procedure in reverse: |
| |
| xtensa_format_encode |
| for each slot { |
| xtensa_opcode_encode |
| for each operand { |
| xtensa_operand_encode |
| xtensa_operand_set_field |
| } |
| xtensa_format_set_slot |
| } |
| xtensa_insnbuf_to_chars |
| */ |
| |
| |
| /* Error handling. */ |
| |
| /* Error codes. The code for the most recent error condition can be |
| retrieved with the "errno" function. For any result other than |
| xtensa_isa_ok, an error message containing additional information |
| about the problem can be retrieved using the "error_msg" function. |
| The error messages are stored in an internal buffer, which should |
| not be freed and may be overwritten by subsequent operations. */ |
| |
| typedef enum xtensa_isa_status_enum |
| { |
| xtensa_isa_ok = 0, |
| xtensa_isa_bad_format, |
| xtensa_isa_bad_slot, |
| xtensa_isa_bad_opcode, |
| xtensa_isa_bad_operand, |
| xtensa_isa_bad_field, |
| xtensa_isa_bad_iclass, |
| xtensa_isa_bad_regfile, |
| xtensa_isa_bad_sysreg, |
| xtensa_isa_bad_state, |
| xtensa_isa_bad_interface, |
| xtensa_isa_bad_funcUnit, |
| xtensa_isa_wrong_slot, |
| xtensa_isa_no_field, |
| xtensa_isa_out_of_memory, |
| xtensa_isa_buffer_overflow, |
| xtensa_isa_internal_error, |
| xtensa_isa_bad_value |
| } xtensa_isa_status; |
| |
| extern xtensa_isa_status |
| xtensa_isa_errno (xtensa_isa isa); |
| |
| extern char * |
| xtensa_isa_error_msg (xtensa_isa isa); |
| |
| |
| |
| /* Instruction buffers. */ |
| |
| typedef uint32 xtensa_insnbuf_word; |
| typedef xtensa_insnbuf_word *xtensa_insnbuf; |
| |
| |
| /* Get the size in "insnbuf_words" of the xtensa_insnbuf array. */ |
| |
| extern int |
| xtensa_insnbuf_size (xtensa_isa isa); |
| |
| |
| /* Allocate an xtensa_insnbuf of the right size. */ |
| |
| extern xtensa_insnbuf |
| xtensa_insnbuf_alloc (xtensa_isa isa); |
| |
| |
| /* Release an xtensa_insnbuf. */ |
| |
| extern void |
| xtensa_insnbuf_free (xtensa_isa isa, xtensa_insnbuf buf); |
| |
| |
| /* Conversion between raw memory (char arrays) and our internal |
| instruction representation. This is complicated by the Xtensa ISA's |
| variable instruction lengths. When converting to chars, the buffer |
| must contain a valid instruction so we know how many bytes to copy; |
| thus, the "to_chars" function returns the number of bytes copied or |
| XTENSA_UNDEFINED on error. The "from_chars" function first reads the |
| minimal number of bytes required to decode the instruction length and |
| then proceeds to copy the entire instruction into the buffer; if the |
| memory does not contain a valid instruction, it copies the maximum |
| number of bytes required for the longest Xtensa instruction. The |
| "num_chars" argument may be used to limit the number of bytes that |
| can be read or written. Otherwise, if "num_chars" is zero, the |
| functions may read or write past the end of the code. */ |
| |
| extern int |
| xtensa_insnbuf_to_chars (xtensa_isa isa, const xtensa_insnbuf insn, |
| unsigned char *cp, int num_chars); |
| |
| extern void |
| xtensa_insnbuf_from_chars (xtensa_isa isa, xtensa_insnbuf insn, |
| const unsigned char *cp, int num_chars); |
| |
| |
| |
| /* ISA information. */ |
| |
| /* Initialize the ISA information. */ |
| |
| extern xtensa_isa |
| xtensa_isa_init (xtensa_isa_status *errno_p, char **error_msg_p); |
| |
| |
| /* Deallocate an xtensa_isa structure. */ |
| |
| extern void |
| xtensa_isa_free (xtensa_isa isa); |
| |
| |
| /* Get the maximum instruction size in bytes. */ |
| |
| extern int |
| xtensa_isa_maxlength (xtensa_isa isa); |
| |
| |
| /* Decode the length in bytes of an instruction in raw memory (not an |
| insnbuf). This function reads only the minimal number of bytes |
| required to decode the instruction length. Returns |
| XTENSA_UNDEFINED on error. */ |
| |
| extern int |
| xtensa_isa_length_from_chars (xtensa_isa isa, const unsigned char *cp); |
| |
| |
| /* Get the number of stages in the processor's pipeline. The pipeline |
| stage values returned by other functions in this library will range |
| from 0 to N-1, where N is the value returned by this function. |
| Note that the stage numbers used here may not correspond to the |
| actual processor hardware, e.g., the hardware may have additional |
| stages before stage 0. Returns XTENSA_UNDEFINED on error. */ |
| |
| extern int |
| xtensa_isa_num_pipe_stages (xtensa_isa isa); |
| |
| |
| /* Get the number of various entities that are defined for this processor. */ |
| |
| extern int |
| xtensa_isa_num_formats (xtensa_isa isa); |
| |
| extern int |
| xtensa_isa_num_opcodes (xtensa_isa isa); |
| |
| extern int |
| xtensa_isa_num_regfiles (xtensa_isa isa); |
| |
| extern int |
| xtensa_isa_num_states (xtensa_isa isa); |
| |
| extern int |
| xtensa_isa_num_sysregs (xtensa_isa isa); |
| |
| extern int |
| xtensa_isa_num_interfaces (xtensa_isa isa); |
| |
| extern int |
| xtensa_isa_num_funcUnits (xtensa_isa isa); |
| |
| |
| |
| /* Instruction formats. */ |
| |
| /* Get the name of a format. Returns null on error. */ |
| |
| extern const char * |
| xtensa_format_name (xtensa_isa isa, xtensa_format fmt); |
| |
| |
| /* Given a format name, return the format number. Returns |
| XTENSA_UNDEFINED if the name is not a valid format. */ |
| |
| extern xtensa_format |
| xtensa_format_lookup (xtensa_isa isa, const char *fmtname); |
| |
| |
| /* Decode the instruction format from a binary instruction buffer. |
| Returns XTENSA_UNDEFINED if the format is not recognized. */ |
| |
| extern xtensa_format |
| xtensa_format_decode (xtensa_isa isa, const xtensa_insnbuf insn); |
| |
| |
| /* Set the instruction format field(s) in a binary instruction buffer. |
| All the other fields are set to zero. Returns non-zero on error. */ |
| |
| extern int |
| xtensa_format_encode (xtensa_isa isa, xtensa_format fmt, xtensa_insnbuf insn); |
| |
| |
| /* Find the length (in bytes) of an instruction. Returns |
| XTENSA_UNDEFINED on error. */ |
| |
| extern int |
| xtensa_format_length (xtensa_isa isa, xtensa_format fmt); |
| |
| |
| /* Get the number of slots in an instruction. Returns XTENSA_UNDEFINED |
| on error. */ |
| |
| extern int |
| xtensa_format_num_slots (xtensa_isa isa, xtensa_format fmt); |
| |
| |
| /* Get the opcode for a no-op in a particular slot. |
| Returns XTENSA_UNDEFINED on error. */ |
| |
| extern xtensa_opcode |
| xtensa_format_slot_nop_opcode (xtensa_isa isa, xtensa_format fmt, int slot); |
| |
| |
| /* Get the bits for a specified slot out of an insnbuf for the |
| instruction as a whole and put them into an insnbuf for that one |
| slot, and do the opposite to set a slot. Return non-zero on error. */ |
| |
| extern int |
| xtensa_format_get_slot (xtensa_isa isa, xtensa_format fmt, int slot, |
| const xtensa_insnbuf insn, xtensa_insnbuf slotbuf); |
| |
| extern int |
| xtensa_format_set_slot (xtensa_isa isa, xtensa_format fmt, int slot, |
| xtensa_insnbuf insn, const xtensa_insnbuf slotbuf); |
| |
| |
| |
| /* Opcode information. */ |
| |
| /* Translate a mnemonic name to an opcode. Returns XTENSA_UNDEFINED if |
| the name is not a valid opcode mnemonic. */ |
| |
| extern xtensa_opcode |
| xtensa_opcode_lookup (xtensa_isa isa, const char *opname); |
| |
| |
| /* Decode the opcode for one instruction slot from a binary instruction |
| buffer. Returns the opcode or XTENSA_UNDEFINED if the opcode is |
| illegal. */ |
| |
| extern xtensa_opcode |
| xtensa_opcode_decode (xtensa_isa isa, xtensa_format fmt, int slot, |
| const xtensa_insnbuf slotbuf); |
| |
| |
| /* Set the opcode field(s) for an instruction slot. All other fields |
| in the slot are set to zero. Returns non-zero if the opcode cannot |
| be encoded. */ |
| |
| extern int |
| xtensa_opcode_encode (xtensa_isa isa, xtensa_format fmt, int slot, |
| xtensa_insnbuf slotbuf, xtensa_opcode opc); |
| |
| |
| /* Get the mnemonic name for an opcode. Returns null on error. */ |
| |
| extern const char * |
| xtensa_opcode_name (xtensa_isa isa, xtensa_opcode opc); |
| |
| |
| /* Check various properties of opcodes. These functions return 0 if |
| the condition is false, 1 if the condition is true, and |
| XTENSA_UNDEFINED on error. The instructions are classified as |
| follows: |
| |
| branch: conditional branch; may fall through to next instruction (B*) |
| jump: unconditional branch (J, JX, RET*, RF*) |
| loop: zero-overhead loop (LOOP*) |
| call: unconditional call; control returns to next instruction (CALL*) |
| |
| For the opcodes that affect control flow in some way, the branch |
| target may be specified by an immediate operand or it may be an |
| address stored in a register. You can distinguish these by |
| checking if the instruction has a PC-relative immediate |
| operand. */ |
| |
| extern int |
| xtensa_opcode_is_branch (xtensa_isa isa, xtensa_opcode opc); |
| |
| extern int |
| xtensa_opcode_is_jump (xtensa_isa isa, xtensa_opcode opc); |
| |
| extern int |
| xtensa_opcode_is_loop (xtensa_isa isa, xtensa_opcode opc); |
| |
| extern int |
| xtensa_opcode_is_call (xtensa_isa isa, xtensa_opcode opc); |
| |
| |
| /* Find the number of ordinary operands, state operands, and interface |
| operands for an instruction. These return XTENSA_UNDEFINED on |
| error. */ |
| |
| extern int |
| xtensa_opcode_num_operands (xtensa_isa isa, xtensa_opcode opc); |
| |
| extern int |
| xtensa_opcode_num_stateOperands (xtensa_isa isa, xtensa_opcode opc); |
| |
| extern int |
| xtensa_opcode_num_interfaceOperands (xtensa_isa isa, xtensa_opcode opc); |
| |
| |
| /* Get functional unit usage requirements for an opcode. Each "use" |
| is identified by a <functional unit, pipeline stage> pair. The |
| "num_funcUnit_uses" function returns the number of these "uses" or |
| XTENSA_UNDEFINED on error. The "funcUnit_use" function returns |
| a pointer to a "use" pair or null on error. */ |
| |
| typedef struct xtensa_funcUnit_use_struct |
| { |
| xtensa_funcUnit unit; |
| int stage; |
| } xtensa_funcUnit_use; |
| |
| extern int |
| xtensa_opcode_num_funcUnit_uses (xtensa_isa isa, xtensa_opcode opc); |
| |
| extern xtensa_funcUnit_use * |
| xtensa_opcode_funcUnit_use (xtensa_isa isa, xtensa_opcode opc, int u); |
| |
| |
| |
| /* Operand information. */ |
| |
| /* Get the name of an operand. Returns null on error. */ |
| |
| extern const char * |
| xtensa_operand_name (xtensa_isa isa, xtensa_opcode opc, int opnd); |
| |
| |
| /* Some operands are "invisible", i.e., not explicitly specified in |
| assembly language. When assembling an instruction, you need not set |
| the values of invisible operands, since they are either hardwired or |
| derived from other field values. The values of invisible operands |
| can be examined in the same way as other operands, but remember that |
| an invisible operand may get its value from another visible one, so |
| the entire instruction must be available before examining the |
| invisible operand values. This function returns 1 if an operand is |
| visible, 0 if it is invisible, or XTENSA_UNDEFINED on error. Note |
| that whether an operand is visible is orthogonal to whether it is |
| "implicit", i.e., whether it is encoded in a field in the |
| instruction. */ |
| |
| extern int |
| xtensa_operand_is_visible (xtensa_isa isa, xtensa_opcode opc, int opnd); |
| |
| |
| /* Check if an operand is an input ('i'), output ('o'), or inout ('m') |
| operand. Note: The output operand of a conditional assignment |
| (e.g., movnez) appears here as an inout ('m') even if it is declared |
| in the TIE code as an output ('o'); this allows the compiler to |
| properly handle register allocation for conditional assignments. |
| Returns 0 on error. */ |
| |
| extern char |
| xtensa_operand_inout (xtensa_isa isa, xtensa_opcode opc, int opnd); |
| |
| |
| /* Get and set the raw (encoded) value of the field for the specified |
| operand. The "set" function does not check if the value fits in the |
| field; that is done by the "encode" function below. Both of these |
| functions return non-zero on error, e.g., if the field is not defined |
| for the specified slot. */ |
| |
| extern int |
| xtensa_operand_get_field (xtensa_isa isa, xtensa_opcode opc, int opnd, |
| xtensa_format fmt, int slot, |
| const xtensa_insnbuf slotbuf, uint32 *valp); |
| |
| extern int |
| xtensa_operand_set_field (xtensa_isa isa, xtensa_opcode opc, int opnd, |
| xtensa_format fmt, int slot, |
| xtensa_insnbuf slotbuf, uint32 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. */ |
| |
| extern int |
| xtensa_operand_encode (xtensa_isa isa, xtensa_opcode opc, int opnd, |
| uint32 *valp); |
| |
| extern int |
| xtensa_operand_decode (xtensa_isa isa, xtensa_opcode opc, int opnd, |
| uint32 *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. */ |
| |
| extern int |
| xtensa_operand_is_register (xtensa_isa isa, xtensa_opcode opc, int opnd); |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern int |
| xtensa_operand_do_reloc (xtensa_isa isa, xtensa_opcode opc, int opnd, |
| uint32 *valp, uint32 pc); |
| |
| extern int |
| xtensa_operand_undo_reloc (xtensa_isa isa, xtensa_opcode opc, int opnd, |
| uint32 *valp, uint32 pc); |
| |
| |
| |
| /* State Operands. */ |
| |
| /* Get the state accessed by a state operand. Returns XTENSA_UNDEFINED |
| on error. */ |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern xtensa_regfile |
| xtensa_regfile_lookup (xtensa_isa isa, const char *name); |
| |
| extern 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. */ |
| |
| extern const char * |
| xtensa_regfile_name (xtensa_isa isa, xtensa_regfile rf); |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern int |
| xtensa_regfile_num_bits (xtensa_isa isa, xtensa_regfile rf); |
| |
| |
| /* Get the number of regfile entries. Returns XTENSA_UNDEFINED on |
| error. */ |
| |
| extern int |
| xtensa_regfile_num_entries (xtensa_isa isa, xtensa_regfile rf); |
| |
| |
| |
| /* Processor States. */ |
| |
| /* Look up a state by name. Returns XTENSA_UNDEFINED on error. */ |
| |
| extern xtensa_state |
| xtensa_state_lookup (xtensa_isa isa, const char *name); |
| |
| |
| /* Get the name for a processor state. Returns null on error. */ |
| |
| extern const char * |
| xtensa_state_name (xtensa_isa isa, xtensa_state st); |
| |
| |
| /* Get the bit width for a processor state. |
| Returns XTENSA_UNDEFINED on error. */ |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern xtensa_sysreg |
| xtensa_sysreg_lookup_name (xtensa_isa isa, const char *name); |
| |
| |
| /* Get the name of a sysreg. Returns null on error. */ |
| |
| extern const char * |
| xtensa_sysreg_name (xtensa_isa isa, xtensa_sysreg sysreg); |
| |
| |
| /* Get the register number. Returns XTENSA_UNDEFINED on error. */ |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern xtensa_interface |
| xtensa_interface_lookup (xtensa_isa isa, const char *ifname); |
| |
| |
| /* Get the name of an interface. Returns null on error. */ |
| |
| extern const char * |
| xtensa_interface_name (xtensa_isa isa, xtensa_interface intf); |
| |
| |
| /* Get the bit width for an interface. |
| Returns XTENSA_UNDEFINED on error. */ |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern 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. */ |
| |
| extern xtensa_funcUnit |
| xtensa_funcUnit_lookup (xtensa_isa isa, const char *fname); |
| |
| |
| /* Get the name of a functional unit. Returns null on error. */ |
| |
| extern 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. */ |
| |
| extern int |
| xtensa_funcUnit_num_copies (xtensa_isa isa, xtensa_funcUnit fun); |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| #endif /* XTENSA_LIBISA_H */ |