1 /* 2 * Copyright (c) 2013, Red Hat Inc. 3 * All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 */ 21 22 #ifndef _IMMEDIATE_H 23 #define _IMMEDIATE_H 24 25 #include <sys/types.h> 26 27 /* 28 * functions to map backwards and forwards between logical or floating 29 * point immediates and their corresponding encodings. the mapping 30 * from encoding to immediate is required by the simulator. the reverse 31 * mapping is required by the OpenJDK assembler. 32 * 33 * a logical immediate value supplied to or returned from a map lookup 34 * is always 64 bits. this is sufficient for looking up 32 bit 35 * immediates or their encodings since a 32 bit immediate has the same 36 * encoding as the 64 bit immediate produced by concatenating the 37 * immediate with itself. 38 * 39 * a logical immediate encoding is 13 bits N:immr:imms (3 fields of 40 * widths 1:6:6 -- see the arm spec). they appear as bits [22:10] of a 41 * logical immediate instruction. encodings are supplied and returned 42 * as 32 bit values. if a given 13 bit immediate has no corresponding 43 * encoding then a map lookup will return 0xffffffff. 44 */ 45 46 u_int64_t logical_immediate_for_encoding(u_int32_t encoding); 47 u_int32_t encoding_for_logical_immediate(u_int64_t immediate); 48 u_int64_t fp_immediate_for_encoding(u_int32_t imm8, int is_dp); 49 u_int32_t encoding_for_fp_immediate(float immediate); 50 51 #endif // _IMMEDIATE_H