1 /* 2 * Copyright (c) 2014, Red Hat Inc. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef _IMMEDIATE_H 26 #define _IMMEDIATE_H 27 28 #include <sys/types.h> 29 30 /* 31 * functions to map backwards and forwards between logical or floating 32 * point immediates and their corresponding encodings. the mapping 33 * from encoding to immediate is required by the simulator. the reverse 34 * mapping is required by the OpenJDK assembler. 35 * 36 * a logical immediate value supplied to or returned from a map lookup 37 * is always 64 bits. this is sufficient for looking up 32 bit 38 * immediates or their encodings since a 32 bit immediate has the same 39 * encoding as the 64 bit immediate produced by concatenating the 40 * immediate with itself. 41 * 42 * a logical immediate encoding is 13 bits N:immr:imms (3 fields of 43 * widths 1:6:6 -- see the arm spec). they appear as bits [22:10] of a 44 * logical immediate instruction. encodings are supplied and returned 45 * as 32 bit values. if a given 13 bit immediate has no corresponding 46 * encoding then a map lookup will return 0xffffffff. 47 */ 48 49 u_int64_t logical_immediate_for_encoding(u_int32_t encoding); 50 u_int32_t encoding_for_logical_immediate(u_int64_t immediate); 51 u_int64_t fp_immediate_for_encoding(u_int32_t imm8, int is_dp); 52 u_int32_t encoding_for_fp_immediate(float immediate); 53 54 #endif // _IMMEDIATE_H