cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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tb-hash.h (2344B)

      1/*
      2 * internal execution defines for qemu
      3 *
      4 *  Copyright (c) 2003 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 2.1 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#ifndef EXEC_TB_HASH_H
     21#define EXEC_TB_HASH_H
     22
     23#include "exec/cpu-defs.h"
     24#include "exec/exec-all.h"
     25#include "qemu/xxhash.h"
     26
     27#ifdef CONFIG_SOFTMMU
     28
     29/* Only the bottom TB_JMP_PAGE_BITS of the jump cache hash bits vary for
     30   addresses on the same page.  The top bits are the same.  This allows
     31   TLB invalidation to quickly clear a subset of the hash table.  */
     32#define TB_JMP_PAGE_BITS (TB_JMP_CACHE_BITS / 2)
     33#define TB_JMP_PAGE_SIZE (1 << TB_JMP_PAGE_BITS)
     34#define TB_JMP_ADDR_MASK (TB_JMP_PAGE_SIZE - 1)
     35#define TB_JMP_PAGE_MASK (TB_JMP_CACHE_SIZE - TB_JMP_PAGE_SIZE)
     36
     37static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc)
     38{
     39    target_ulong tmp;
     40    tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
     41    return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK;
     42}
     43
     44static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
     45{
     46    target_ulong tmp;
     47    tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
     48    return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK)
     49           | (tmp & TB_JMP_ADDR_MASK));
     50}
     51
     52#else
     53
     54/* In user-mode we can get better hashing because we do not have a TLB */
     55static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
     56{
     57    return (pc ^ (pc >> TB_JMP_CACHE_BITS)) & (TB_JMP_CACHE_SIZE - 1);
     58}
     59
     60#endif /* CONFIG_SOFTMMU */
     61
     62static inline
     63uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc, uint32_t flags,
     64                      uint32_t cf_mask, uint32_t trace_vcpu_dstate)
     65{
     66    return qemu_xxhash7(phys_pc, pc, flags, cf_mask, trace_vcpu_dstate);
     67}
     68
     69#endif