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/*
* Copyright (C) 2015-2020 Paul Cercueil <paul@crapouillou.net>
*
* 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 2.1 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.
*/
#include "blockcache.h"
#include "debug.h"
#include "lightrec-private.h"
#include "memmanager.h"
#include <stdbool.h>
#include <stdlib.h>
/* Must be power of two */
#define LUT_SIZE 0x4000
struct blockcache {
struct lightrec_state *state;
struct block * lut[LUT_SIZE];
};
struct block * lightrec_find_block(struct blockcache *cache, u32 pc)
{
struct block *block;
pc = kunseg(pc);
for (block = cache->lut[(pc >> 2) & (LUT_SIZE - 1)];
block; block = block->next)
if (kunseg(block->pc) == pc)
return block;
return NULL;
}
void remove_from_code_lut(struct blockcache *cache, struct block *block)
{
struct lightrec_state *state = block->state;
const struct opcode *op;
u32 offset = lut_offset(block->pc);
/* Use state->get_next_block in the code LUT, which basically
* calls back get_next_block_func(), until the compiler
* overrides this. This is required, as a NULL value in the code
* LUT means an outdated block. */
state->code_lut[offset] = state->get_next_block;
for (op = block->opcode_list; op; op = op->next)
if (op->c.i.op == OP_META_SYNC)
state->code_lut[offset + op->offset] = NULL;
}
void lightrec_register_block(struct blockcache *cache, struct block *block)
{
u32 pc = kunseg(block->pc);
struct block *old;
old = cache->lut[(pc >> 2) & (LUT_SIZE - 1)];
if (old)
block->next = old;
cache->lut[(pc >> 2) & (LUT_SIZE - 1)] = block;
remove_from_code_lut(cache, block);
}
void lightrec_unregister_block(struct blockcache *cache, struct block *block)
{
u32 pc = kunseg(block->pc);
struct block *old = cache->lut[(pc >> 2) & (LUT_SIZE - 1)];
if (old == block) {
cache->lut[(pc >> 2) & (LUT_SIZE - 1)] = old->next;
return;
}
for (; old; old = old->next) {
if (old->next == block) {
old->next = block->next;
return;
}
}
pr_err("Block at PC 0x%x is not in cache\n", block->pc);
}
void lightrec_free_block_cache(struct blockcache *cache)
{
struct block *block, *next;
unsigned int i;
for (i = 0; i < LUT_SIZE; i++) {
for (block = cache->lut[i]; block; block = next) {
next = block->next;
lightrec_free_block(block);
}
}
lightrec_free(cache->state, MEM_FOR_LIGHTREC, sizeof(*cache), cache);
}
struct blockcache * lightrec_blockcache_init(struct lightrec_state *state)
{
struct blockcache *cache;
cache = lightrec_calloc(state, MEM_FOR_LIGHTREC, sizeof(*cache));
if (!cache)
return NULL;
cache->state = state;
return cache;
}
u32 lightrec_calculate_block_hash(const struct block *block)
{
const struct lightrec_mem_map *map = block->map;
u32 pc, hash = 0xffffffff;
const u32 *code;
unsigned int i;
pc = kunseg(block->pc) - map->pc;
while (map->mirror_of)
map = map->mirror_of;
code = map->address + pc;
/* Jenkins one-at-a-time hash algorithm */
for (i = 0; i < block->nb_ops; i++) {
hash += *code++;
hash += (hash << 10);
hash ^= (hash >> 6);
}
hash += (hash << 3);
hash ^= (hash >> 11);
hash += (hash << 15);
return hash;
}
bool lightrec_block_is_outdated(struct block *block)
{
void **lut_entry = &block->state->code_lut[lut_offset(block->pc)];
bool outdated;
if (*lut_entry)
return false;
outdated = block->hash != lightrec_calculate_block_hash(block);
if (likely(!outdated)) {
/* The block was marked as outdated, but the content is still
* the same */
if (block->function)
*lut_entry = block->function;
else
*lut_entry = block->state->get_next_block;
}
return outdated;
}
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