/* * AArch64 specific helpers * * Copyright (c) 2013 Alexander Graf * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see . */ #include "cpu.h" #include "exec/gdbstub.h" #include "helper.h" #include "qemu/host-utils.h" #include "sysemu/sysemu.h" #include "qemu/bitops.h" /* C2.4.7 Multiply and divide */ /* special cases for 0 and LLONG_MIN are mandated by the standard */ uint64_t HELPER(udiv64)(uint64_t num, uint64_t den) { if (den == 0) { return 0; } return num / den; } int64_t HELPER(sdiv64)(int64_t num, int64_t den) { if (den == 0) { return 0; } if (num == LLONG_MIN && den == -1) { return LLONG_MIN; } return num / den; } uint64_t HELPER(clz64)(uint64_t x) { return clz64(x); } uint64_t HELPER(rbit64)(uint64_t x) { /* assign the correct byte position */ x = bswap64(x); /* assign the correct nibble position */ x = ((x & 0xf0f0f0f0f0f0f0f0ULL) >> 4) | ((x & 0x0f0f0f0f0f0f0f0fULL) << 4); /* assign the correct bit position */ x = ((x & 0x8888888888888888ULL) >> 3) | ((x & 0x4444444444444444ULL) >> 1) | ((x & 0x2222222222222222ULL) << 1) | ((x & 0x1111111111111111ULL) << 3); return x; }