hw/xtensa/xtensa-isa.h

3  * Copyright (c) 2001-2013 Tensilica Inc.
41  * library contains most of the ISA-specific information for a
48  * . an instruction buffer - for holding the raw instruction bits
49  * . ISA info - information about the ISA as a whole
50  * . instruction formats - instruction size and slot structure
51  * . opcodes - information about individual instructions
52  * . operands - information about register and immediate instruction operands
53  * . stateOperands - information about processor state instruction operands
54  * . interfaceOperands - information about interface instruction operands
55  * . register files - register file information
56  * . processor states - internal processor state information
57  * . system registers - "special registers" and "user registers"
58  * . interfaces - TIE interfaces that are external to the processor
59  * . functional units - TIE shared functions
73  * specific values are only fixed for a particular instantiation of an
89 #define XTENSA_UNDEFINED -1
96  * format, where the format defines a fixed number of slots for
104  * individual slots in those instructions -- the contents of a slot need
205  * minimal number of bytes required to decode the instruction length and
241  * Decode the length in bytes of an instruction in raw memory (not an
243  * required to decode the instruction length. Returns
253  * from 0 to N-1, where N is the value returned by this function.
305  * All the other fields are set to zero. Returns non-zero on error.
313  * Find the length (in bytes) of an instruction. Returns
329  * Get the opcode for a no-op in a particular slot.
340  * slot, and do the opposite to set a slot. Return non-zero on error.
373  * in the slot are set to zero. Returns non-zero if the opcode cannot
393  * loop: zero-overhead loop (LOOP*)
399  * checking if the instruction has a PC-relative immediate
486  * functions return non-zero on error, e.g., if the field is not defined
503  * the argument pointer. The return value is non-zero on error.
515  * sort (e.g., PC-relative or not). The "is_register" function returns
529  * 64-bit data type may occupy two 32-bit registers. Only the first
532  * non-register operands, the return value is undefined. Returns
544  * treated with worst-case assumptions. The function returns 0 if the
553  * Check if an immediate operand is PC-relative. Returns 0 for register
554  * operands and non-PC-relative immediates, 1 for PC-relative
562  * For PC-relative offset operands, the interpretation of the offset may
565  * perform PC-relative relocations and to undo them (as in the
568  * corresponding PC-relative offset (which can then be encoded and
571  * appropriate address. The return values are non-zero on error. Note