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/* Simulator header for cgen scache support.
Copyright (C) 1998-2020 Free Software Foundation, Inc.
Contributed by Cygnus Solutions.
This file is part of GDB, the GNU debugger.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef CGEN_SCACHE_H
#define CGEN_SCACHE_H
#ifndef WITH_SCACHE
#define WITH_SCACHE 0
#endif
/* When caching bb's, instructions are extracted into "chains".
SCACHE_MAP is a hash table into these chains. */
typedef struct {
IADDR pc;
SCACHE *sc;
} SCACHE_MAP;
typedef struct cpu_scache {
/* Simulator cache size. Must be a power of 2.
This is the number of elements in the `cache' member. */
unsigned int size;
#define CPU_SCACHE_SIZE(cpu) ((cpu) -> cgen_cpu.scache.size)
/* The cache. */
SCACHE *cache;
#define CPU_SCACHE_CACHE(cpu) ((cpu) -> cgen_cpu.scache.cache)
#if WITH_SCACHE_PBB
/* Number of hash chains. Must be a power of 2. */
unsigned int num_hash_chains;
#define CPU_SCACHE_NUM_HASH_CHAINS(cpu) ((cpu) -> cgen_cpu.scache.num_hash_chains)
/* Number of entries in each hash chain.
The hash table is a statically allocated NxM array where
N = num_hash_chains
M = num_hash_chain_entries. */
unsigned int num_hash_chain_entries;
#define CPU_SCACHE_NUM_HASH_CHAIN_ENTRIES(cpu) ((cpu) -> cgen_cpu.scache.num_hash_chain_entries)
/* Maximum number of instructions in a chain.
??? This just let's us set a static size of chain_lengths table.
In a simulation that handles more than just the cpu, this might also be
used to keep too many instructions from being executed before checking
for events (or some such). */
unsigned int max_chain_length;
#define CPU_SCACHE_MAX_CHAIN_LENGTH(cpu) ((cpu) -> cgen_cpu.scache.max_chain_length)
/* Special scache entry for (re)starting bb extraction. */
SCACHE *pbb_begin;
#define CPU_SCACHE_PBB_BEGIN(cpu) ((cpu) -> cgen_cpu.scache.pbb_begin)
/* Hash table into cached chains. */
SCACHE_MAP *hash_table;
#define CPU_SCACHE_HASH_TABLE(cpu) ((cpu) -> cgen_cpu.scache.hash_table)
/* Next free entry in cache. */
SCACHE *next_free;
#define CPU_SCACHE_NEXT_FREE(cpu) ((cpu) -> cgen_cpu.scache.next_free)
/* Kind of branch being taken.
Only used by functional semantics, not switch form. */
SEM_BRANCH_TYPE pbb_br_type;
#define CPU_PBB_BR_TYPE(cpu) ((cpu) -> cgen_cpu.scache.pbb_br_type)
/* Target's branch address. */
IADDR pbb_br_npc;
#define CPU_PBB_BR_NPC(cpu) ((cpu) -> cgen_cpu.scache.pbb_br_npc)
#endif /* WITH_SCACHE_PBB */
#if WITH_PROFILE_SCACHE_P
/* Cache hits, misses. */
unsigned long hits, misses;
#define CPU_SCACHE_HITS(cpu) ((cpu) -> cgen_cpu.scache.hits)
#define CPU_SCACHE_MISSES(cpu) ((cpu) -> cgen_cpu.scache.misses)
#if WITH_SCACHE_PBB
/* Chain length counts.
Each element is a count of the number of chains created with that
length. */
unsigned long *chain_lengths;
#define CPU_SCACHE_CHAIN_LENGTHS(cpu) ((cpu) -> cgen_cpu.scache.chain_lengths)
/* Number of times cache was flushed due to its being full. */
unsigned long full_flushes;
#define CPU_SCACHE_FULL_FLUSHES(cpu) ((cpu) -> cgen_cpu.scache.full_flushes)
#endif
#endif
} CPU_SCACHE;
/* Hash a PC value.
This is split into two parts to help with moving as much of the
computation out of the main loop. */
#define CPU_SCACHE_HASH_MASK(cpu) (CPU_SCACHE_SIZE (cpu) - 1)
#define SCACHE_HASH_PC(pc, mask) \
((CGEN_MIN_INSN_SIZE == 2 ? ((pc) >> 1) \
: CGEN_MIN_INSN_SIZE == 4 ? ((pc) >> 2) \
: (pc)) \
& (mask))
/* Non-zero if cache is in use. */
#define USING_SCACHE_P(sd) (STATE_SCACHE_SIZE (sd) > 0)
/* Install the simulator cache into the simulator. */
MODULE_INSTALL_FN scache_install;
/* Lookup a PC value in the scache [compilation only]. */
extern SCACHE * scache_lookup (SIM_CPU *, IADDR);
/* Return a pointer to at least N buffers. */
extern SCACHE *scache_lookup_or_alloc (SIM_CPU *, IADDR, int, SCACHE **);
/* Flush all cpu's scaches. */
extern void scache_flush (SIM_DESC);
/* Flush a cpu's scache. */
extern void scache_flush_cpu (SIM_CPU *);
/* Scache profiling support. */
/* Print summary scache usage information. */
extern void scache_print_profile (SIM_CPU *cpu, int verbose);
#if WITH_PROFILE_SCACHE_P
#define PROFILE_COUNT_SCACHE_HIT(cpu) \
do { \
if (CPU_PROFILE_FLAGS (cpu) [PROFILE_SCACHE_IDX]) \
++ CPU_SCACHE_HITS (cpu); \
} while (0)
#define PROFILE_COUNT_SCACHE_MISS(cpu) \
do { \
if (CPU_PROFILE_FLAGS (cpu) [PROFILE_SCACHE_IDX]) \
++ CPU_SCACHE_MISSES (cpu); \
} while (0)
#define PROFILE_COUNT_SCACHE_CHAIN_LENGTH(cpu,length) \
do { \
if (CPU_PROFILE_FLAGS (cpu) [PROFILE_SCACHE_IDX]) \
++ CPU_SCACHE_CHAIN_LENGTHS (cpu) [length]; \
} while (0)
#define PROFILE_COUNT_SCACHE_FULL_FLUSH(cpu) \
do { \
if (CPU_PROFILE_FLAGS (cpu) [PROFILE_SCACHE_IDX]) \
++ CPU_SCACHE_FULL_FLUSHES (cpu); \
} while (0)
#else
#define PROFILE_COUNT_SCACHE_HIT(cpu)
#define PROFILE_COUNT_SCACHE_MISS(cpu)
#define PROFILE_COUNT_SCACHE_CHAIN_LENGTH(cpu,length)
#define PROFILE_COUNT_SCACHE_FULL_FLUSH(cpu)
#endif
#endif /* CGEN_SCACHE_H */
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