diff options
Diffstat (limited to 'include/xtensa-isa.h')
| -rw-r--r-- | include/xtensa-isa.h | 822 |
1 files changed, 688 insertions, 134 deletions
diff --git a/include/xtensa-isa.h b/include/xtensa-isa.h index 54f750c9a..2dc11b924 100644 --- a/include/xtensa-isa.h +++ b/include/xtensa-isa.h @@ -1,5 +1,5 @@ /* Interface definition for configurable Xtensa ISA support. - Copyright 2003 Free Software Foundation, Inc. + Copyright 2003, 2004 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. @@ -20,209 +20,763 @@ #ifndef XTENSA_LIBISA_H #define XTENSA_LIBISA_H -/* Use the statically-linked version for the GNU tools. */ -#define STATIC_LIBISA 1 - #ifdef __cplusplus extern "C" { #endif +/* Use the statically-linked version for the GNU tools. */ +#define STATIC_LIBISA 1 + +/* 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. To support Xtensa's - configurability and user-defined instruction extensions (i.e., TIE), the - library is initialized by loading one or more dynamic libraries; only a - small set of interface code is present in the statically-linked portion - of the library. +/* 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 four abstract data types. + 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 - . opcode info - information about individual instructions - . operand info - information about specific instruction operands - - It would be nice to implement these as classes in C++, but the library is - implemented in C to match the expectations of the GNU tools. - Instead, 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. */ + . 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; + + +/* Opcodes, formats, regfiles, states, sysregs, ctypes, and protos 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 void* xtensa_isa; -typedef void* xtensa_operand; - - -/* Opcodes are represented here using sequential integers beginning with 0. - The specific value used for a particular opcode is only fixed for a - particular instantiation of an xtensa_isa structure, so these values - should only be used internally. */ typedef int xtensa_opcode; - -/* Define a unique value for undefined opcodes ("static const int" doesn't - seem to work for this because EGCS 1.0.3 on i686-Linux without -O won't - allow it to be used as an initializer). */ -#define XTENSA_UNDEFINED -1 +typedef int xtensa_format; +typedef int xtensa_regfile; +typedef int xtensa_state; +typedef int xtensa_sysreg; +typedef int xtensa_interface; +typedef int xtensa_funcUnit; -typedef int libisa_module_specifier; +/* Define a unique value for undefined items. */ -extern xtensa_isa xtensa_isa_init (void); +#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 + should 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 words of the xtensa_insnbuf array. */ -extern int xtensa_insnbuf_size (xtensa_isa); -/* Allocate (with malloc) an xtensa_insnbuf of the right size. */ -extern xtensa_insnbuf xtensa_insnbuf_alloc (xtensa_isa); +/* Get the size in "insnbuf_words" of the xtensa_insnbuf array. */ -/* Release (with free) an xtensa_insnbuf of the right size. */ -extern void xtensa_insnbuf_free (xtensa_insnbuf); +extern int +xtensa_insnbuf_size (xtensa_isa isa); -/* Inward and outward conversion from memory images (byte streams) to our - internal instruction representation. */ -extern void xtensa_insnbuf_to_chars (xtensa_isa, const xtensa_insnbuf, - char *); -extern void xtensa_insnbuf_from_chars (xtensa_isa, xtensa_insnbuf, - const char *); +/* Allocate an xtensa_insnbuf of the right size. */ +extern xtensa_insnbuf +xtensa_insnbuf_alloc (xtensa_isa isa); -/* ISA information. */ -/* Load the ISA information from a shared library. If successful, this returns - a value which identifies the ISA for use in subsequent calls to the ISA - library; otherwise, it returns NULL. Multiple ISAs can be loaded to support - heterogeneous multiprocessor systems. */ -extern xtensa_isa xtensa_load_isa (libisa_module_specifier); +/* Release an xtensa_insnbuf. */ + +extern void +xtensa_insnbuf_free (xtensa_isa isa, xtensa_insnbuf buf); + -/* Extend an existing set of ISA information by loading an additional shared - library of ISA information. This is primarily intended for loading TIE - extensions. If successful, the return value is non-zero. */ -extern int xtensa_extend_isa (xtensa_isa, libisa_module_specifier); +/* 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. */ -/* The default ISA. This variable is set automatically to the ISA most - recently loaded and is provided as a convenience. An exception is the GNU - opcodes library, where there is a fixed interface that does not allow - passing the ISA as a parameter and the ISA must be taken from this global - variable. (Note: Since this variable is just a convenience, it is not - exported when libisa is built as a DLL, due to the hassle of dealing with - declspecs.) */ -extern xtensa_isa xtensa_default_isa; +extern int +xtensa_insnbuf_to_chars (xtensa_isa isa, const xtensa_insnbuf insn, + char *cp, int num_chars); + +extern void +xtensa_insnbuf_from_chars (xtensa_isa isa, xtensa_insnbuf insn, + const 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); + +extern void +xtensa_isa_free (xtensa_isa isa); + /* Get the maximum instruction size in bytes. */ -extern int xtensa_insn_maxlength (xtensa_isa); -/* Get the total number of opcodes for this processor. */ -extern int xtensa_num_opcodes (xtensa_isa); +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 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, const char *); -/* Decode a binary instruction buffer. Returns the opcode or - XTENSA_UNDEFINED if the instruction is illegal. */ -extern xtensa_opcode xtensa_decode_insn (xtensa_isa, const xtensa_insnbuf); +extern xtensa_opcode +xtensa_opcode_lookup (xtensa_isa isa, const char *opname); -/* Opcode information. */ +/* 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) in a binary instruction buffer. The operand - fields are set to zero. */ -extern void xtensa_encode_insn (xtensa_isa, xtensa_opcode, xtensa_insnbuf); +/* 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. */ -/* Get the mnemonic name for an opcode. */ -extern const char * xtensa_opcode_name (xtensa_isa, xtensa_opcode); +extern int +xtensa_opcode_encode (xtensa_isa isa, xtensa_format fmt, int slot, + xtensa_insnbuf slotbuf, xtensa_opcode opc); -/* Find the length (in bytes) of an instruction. */ -extern int xtensa_insn_length (xtensa_isa, xtensa_opcode); -/* Find the length of an instruction by looking only at the first byte. */ -extern int xtensa_insn_length_from_first_byte (xtensa_isa, char); +/* Get the mnemonic name for an opcode. Returns null on error. */ -/* Find the number of operands for an instruction. */ -extern int xtensa_num_operands (xtensa_isa, xtensa_opcode); +extern const char * +xtensa_opcode_name (xtensa_isa isa, xtensa_opcode opc); -/* Get the information about operand number "opnd" of a particular opcode. */ -extern xtensa_operand xtensa_get_operand (xtensa_isa, xtensa_opcode, int); +/* 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. */ -/* Find the kind of operand. There are three possibilities: - 1) PC-relative immediates (e.g., "l", "L"). These can be identified with - the xtensa_operand_isPCRelative function. - 2) non-PC-relative immediates ("i"). - 3) register-file short names (e.g., "a", "b", "m" and others defined - via TIE). */ -extern char * xtensa_operand_kind (xtensa_operand); +/* 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 ('<'), output ('>'), or inout ('=') + +/* 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 ('=') even if it is declared - in the TIE code as an output ('>'); this allows the compiler to - properly handle register allocation for conditional assignments. */ -extern char xtensa_operand_inout (xtensa_operand); + (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. */ -extern uint32 xtensa_operand_get_field (xtensa_operand, const xtensa_insnbuf); + 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 void xtensa_operand_set_field (xtensa_operand, xtensa_insnbuf, uint32); +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 encode function has a special return type - (xtensa_encode_result) to indicate success or the reason for failure; the - encoded value is returned through the argument pointer. The decode function - has no possibility of failure and returns the decoded value. */ +/* 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. */ -typedef enum -{ - xtensa_encode_result_ok, - xtensa_encode_result_align, - xtensa_encode_result_not_in_table, - xtensa_encode_result_too_low, - xtensa_encode_result_too_high, - xtensa_encode_result_not_ok, - xtensa_encode_result_max = xtensa_encode_result_not_ok -} xtensa_encode_result; +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); + + +/* 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); + + +/* 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); -extern xtensa_encode_result xtensa_operand_encode (xtensa_operand, uint32 *); -extern uint32 xtensa_operand_decode (xtensa_operand, uint32); +/* Get the name of a functional unit. Returns null on error. */ +extern const char * +xtensa_funcUnit_name (xtensa_isa isa, xtensa_funcUnit fun); -/* 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 first function - takes the desired address and the PC of the current instruction and returns - the unencoded value to be stored in the offset field. The second function - takes the unencoded offset value and the current PC and returns the address. - Note that these functions do not replace the encode/decode functions; the - operands must be encoded/decoded separately. */ -extern int xtensa_operand_isPCRelative (xtensa_operand); +/* Functional units may be replicated. See how many instances of a + particular function unit exist. Returns XTENSA_UNDEFINED on error. */ -extern uint32 xtensa_operand_do_reloc (xtensa_operand, uint32, uint32); +extern int +xtensa_funcUnit_num_copies (xtensa_isa isa, xtensa_funcUnit fun); -extern uint32 xtensa_operand_undo_reloc (xtensa_operand, uint32, uint32); #ifdef __cplusplus } |