projects / qemu.git / blame
| Commit | Line | Data |
|---|---|---|
| 38de4c46 BS |
1 | /* |
| 2 | * x86 shift helpers | |
| 3 | * | |
| 4 | * Copyright (c) 2008 Fabrice Bellard | |
| 5 | * | |
| 6 | * This library is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU Lesser General Public | |
| 8 | * License as published by the Free Software Foundation; either | |
| 9 | * version 2 of the License, or (at your option) any later version. | |
| 10 | * | |
| 11 | * This library is distributed in the hope that it will be useful, | |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | * Lesser General Public License for more details. | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU Lesser General Public | |
| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
| 18 | */ | |
| 19 | ||
| 20 | #define DATA_BITS (1 << (3 + SHIFT)) | |
| 21 | #define SHIFT_MASK (DATA_BITS - 1) | |
| 22 | #if DATA_BITS <= 32 | |
| 23 | #define SHIFT1_MASK 0x1f | |
| 24 | #else | |
| 25 | #define SHIFT1_MASK 0x3f | |
| 26 | #endif | |
| 27 | ||
| 28 | #if DATA_BITS == 8 | |
| 29 | #define SUFFIX b | |
| 30 | #define DATA_MASK 0xff | |
| 31 | #elif DATA_BITS == 16 | |
| 32 | #define SUFFIX w | |
| 33 | #define DATA_MASK 0xffff | |
| 34 | #elif DATA_BITS == 32 | |
| 35 | #define SUFFIX l | |
| 36 | #define DATA_MASK 0xffffffff | |
| 37 | #elif DATA_BITS == 64 | |
| 38 | #define SUFFIX q | |
| 39 | #define DATA_MASK 0xffffffffffffffffULL | |
| 40 | #else | |
| 41 | #error unhandled operand size | |
| 42 | #endif | |
| 43 | ||
| 44 | target_ulong glue(helper_rcl, SUFFIX)(target_ulong t0, target_ulong t1) | |
| 45 | { | |
| 46 | int count, eflags; | |
| 47 | target_ulong src; | |
| 48 | target_long res; | |
| 49 | ||
| 50 | count = t1 & SHIFT1_MASK; | |
| 51 | #if DATA_BITS == 16 | |
| 52 | count = rclw_table[count]; | |
| 53 | #elif DATA_BITS == 8 | |
| 54 | count = rclb_table[count]; | |
| 55 | #endif | |
| 56 | if (count) { | |
| 57 | eflags = helper_cc_compute_all(CC_OP); | |
| 58 | t0 &= DATA_MASK; | |
| 59 | src = t0; | |
| 60 | res = (t0 << count) | ((target_ulong)(eflags & CC_C) << (count - 1)); | |
| 61 | if (count > 1) { | |
| 62 | res |= t0 >> (DATA_BITS + 1 - count); | |
| 63 | } | |
| 64 | t0 = res; | |
| 65 | env->cc_tmp = (eflags & ~(CC_C | CC_O)) | | |
| 66 | (lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) | | |
| 67 | ((src >> (DATA_BITS - count)) & CC_C); | |
| 68 | } else { | |
| 69 | env->cc_tmp = -1; | |
| 70 | } | |
| 71 | return t0; | |
| 72 | } | |
| 73 | ||
| 74 | target_ulong glue(helper_rcr, SUFFIX)(target_ulong t0, target_ulong t1) | |
| 75 | { | |
| 76 | int count, eflags; | |
| 77 | target_ulong src; | |
| 78 | target_long res; | |
| 79 | ||
| 80 | count = t1 & SHIFT1_MASK; | |
| 81 | #if DATA_BITS == 16 | |
| 82 | count = rclw_table[count]; | |
| 83 | #elif DATA_BITS == 8 | |
| 84 | count = rclb_table[count]; | |
| 85 | #endif | |
| 86 | if (count) { | |
| 87 | eflags = helper_cc_compute_all(CC_OP); | |
| 88 | t0 &= DATA_MASK; | |
| 89 | src = t0; | |
| 90 | res = (t0 >> count) | | |
| 91 | ((target_ulong)(eflags & CC_C) << (DATA_BITS - count)); | |
| 92 | if (count > 1) { | |
| 93 | res |= t0 << (DATA_BITS + 1 - count); | |
| 94 | } | |
| 95 | t0 = res; | |
| 96 | env->cc_tmp = (eflags & ~(CC_C | CC_O)) | | |
| 97 | (lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) | | |
| 98 | ((src >> (count - 1)) & CC_C); | |
| 99 | } else { | |
| 100 | env->cc_tmp = -1; | |
| 101 | } | |
| 102 | return t0; | |
| 103 | } | |
| 104 | ||
| 105 | #undef DATA_BITS | |
| 106 | #undef SHIFT_MASK | |
| 107 | #undef SHIFT1_MASK | |
| 108 | #undef DATA_TYPE | |
| 109 | #undef DATA_MASK | |
| 110 | #undef SUFFIX |