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(script_finalize): Also initialize the proc_info.
(build_script): For signal-frames, generate an instruction that will set is_signal_frame to TRUE. 2002/12/11 12:27:36-08:00 mostang.com!davidm Rename: src/ia64/script.c -> src/ia64/Gscript.c (Logical change 1.30)
This commit is contained in:
mostang.com!davidm
parent
eb1797b8da
commit
8f82941a84
1 changed files with 553 additions and 0 deletions
553
src/ia64/Gscript.c
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553
src/ia64/Gscript.c
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/* libunwind - a platform-independent unwind library
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Copyright (C) 2001-2002 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include "offsets.h"
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#include "rse.h"
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#include "unwind_i.h"
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#ifdef HAVE___THREAD
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static __thread struct ia64_script_cache ia64_per_thread_cache;
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#endif
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static inline unw_hash_index_t
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hash (unw_word_t ip)
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{
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# define magic 0x9e3779b97f4a7c16 /* based on (sqrt(5)/2-1)*2^64 */
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return (ip >> 4) * magic >> (64 - IA64_LOG_UNW_HASH_SIZE);
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}
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static inline long
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cache_match (struct ia64_script *script, unw_word_t ip, unw_word_t pr)
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{
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/* XXX lock script cache */
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if (ip == script->ip && ((pr ^ script->pr_val) & script->pr_mask) == 0)
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/* keep the lock... */
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return 1;
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/* XXX unlock script cache */
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return 0;
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}
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static inline void
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flush_script_cache (unw_addr_space_t as, struct ia64_script_cache *cache)
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{
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int i;
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for (i = 0; i < IA64_UNW_CACHE_SIZE; ++i)
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cache->buckets[i].ip = 0;
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cache->generation = as->cache_generation;
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}
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static inline struct ia64_script_cache *
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get_script_cache (unw_addr_space_t as)
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{
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struct ia64_script_cache *cache = &as->global_cache;
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#ifdef HAVE___THREAD
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if (as->caching_policy == UNW_CACHE_PER_THREAD)
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cache = &ia64_per_thread_cache;
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#endif
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if (as->cache_generation != cache->generation)
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flush_script_cache (as, cache);
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return cache;
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}
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static struct ia64_script *
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script_lookup (struct ia64_script_cache *cache, struct ia64_cursor *c)
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{
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struct ia64_script *script = cache->buckets + c->hint;
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unsigned short index;
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unw_word_t ip, pr;
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STAT(++unw.stat.cache.lookups);
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ip = c->ip;
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pr = c->pr;
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if (cache_match (script, ip, pr))
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{
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STAT(++unw.stat.cache.hinted_hits);
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return script;
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}
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index = cache->hash[hash (ip)];
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if (index >= IA64_UNW_CACHE_SIZE)
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return 0;
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script = cache->buckets + index;
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while (1)
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{
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if (cache_match (script, ip, pr))
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{
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/* update hint; no locking needed: single-word writes are atomic */
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STAT(++unw.stat.cache.normal_hits);
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c->hint = cache->buckets[c->prev_script].hint =
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(script - cache->buckets);
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return script;
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}
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if (script->coll_chain >= IA64_UNW_HASH_SIZE)
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return 0;
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script = cache->buckets + script->coll_chain;
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STAT(++unw.stat.cache.collision_chain_traversals);
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}
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}
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struct ia64_script *
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ia64_script_lookup (struct ia64_cursor *c)
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{
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return script_lookup (get_script_cache (c->as), c);
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}
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/* On returning, the lock for the SCRIPT is still being held. */
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static inline struct ia64_script *
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script_new (struct ia64_script_cache *cache, unw_word_t ip)
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{
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struct ia64_script *script, *prev, *tmp;
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unw_hash_index_t index;
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unsigned short head;
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STAT(++unw.stat.script.news);
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/* XXX lock hash table */
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{
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head = cache->lru_head;
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script = cache->buckets + head;
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cache->lru_head = script->lru_chain;
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}
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/* XXX unlock hash table */
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/* XXX We'll deadlock here if we interrupt a thread that is holding
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the script->lock. */
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/* XXX lock script */
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/* XXX lock unwind data lock */
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{
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/* re-insert script at the tail of the LRU chain: */
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cache->buckets[cache->lru_tail].lru_chain = head;
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cache->lru_tail = head;
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/* remove the old script from the hash table (if it's there): */
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if (script->ip)
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{
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index = hash (script->ip);
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tmp = cache->buckets + cache->hash[index];
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prev = 0;
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while (1)
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{
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if (tmp == script)
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{
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if (prev)
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prev->coll_chain = tmp->coll_chain;
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else
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cache->hash[index] = tmp->coll_chain;
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break;
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}
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else
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prev = tmp;
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if (tmp->coll_chain >= IA64_UNW_CACHE_SIZE)
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/* old script wasn't in the hash-table */
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break;
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tmp = cache->buckets + tmp->coll_chain;
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}
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}
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/* enter new script in the hash table */
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index = hash (ip);
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script->coll_chain = cache->hash[index];
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cache->hash[index] = script - cache->buckets;
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script->ip = ip; /* set new IP while we're holding the locks */
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STAT(if (script->coll_chain < IA64_UNW_CACHE_SIZE)
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++unw.stat.script.collisions);
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}
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/* XXX unlock unwind data lock */
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script->hint = 0;
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script->count = 0;
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return script;
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}
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static inline void
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script_finalize (struct ia64_script *script, struct ia64_cursor *c,
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struct ia64_state_record *sr)
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{
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script->pr_mask = sr->pr_mask;
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script->pr_val = sr->pr_val;
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script->pi = c->pi;
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}
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static inline void
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script_emit (struct ia64_script *script, struct ia64_script_insn insn)
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{
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if (script->count >= IA64_MAX_SCRIPT_LEN)
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{
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dprintf ("%s: script exceeds maximum size of %u instructions!\n",
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__FUNCTION__, IA64_MAX_SCRIPT_LEN);
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return;
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}
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script->insn[script->count++] = insn;
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}
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static inline void
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emit_nat_info (struct ia64_state_record *sr, int i, struct ia64_script *script)
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{
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struct ia64_reg_info *r = sr->curr.reg + i;
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struct ia64_script_insn insn;
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enum ia64_script_insn_opcode opc = IA64_INSN_SET;
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unsigned long val = 0;
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switch (r->where)
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{
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case IA64_WHERE_GR:
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val = IA64_LOC (r->val, 0);
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break;
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case IA64_WHERE_FR:
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val = 0; /* value doesn't matter... */
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break;
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case IA64_WHERE_BR:
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val = IA64_LOC (0, 0); /* no NaT bit */
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break;
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case IA64_WHERE_PSPREL:
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case IA64_WHERE_SPREL:
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opc = IA64_INSN_SETNAT_MEMSTK;
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break;
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default:
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dprintf ("%s: don't know how to emit nat info for where = %u\n",
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__FUNCTION__, r->where);
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return;
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}
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insn.opc = opc;
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insn.dst = unw.preg_index[i];
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insn.val = val;
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script_emit (script, insn);
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}
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static void
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compile_reg (struct ia64_state_record *sr, int i, struct ia64_script *script)
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{
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struct ia64_reg_info *r = sr->curr.reg + i;
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enum ia64_script_insn_opcode opc;
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unsigned long val, rval;
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struct ia64_script_insn insn;
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long is_preserved_gr;
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if (r->where == IA64_WHERE_NONE || r->when >= sr->when_target)
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return;
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opc = IA64_INSN_MOVE;
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val = rval = r->val;
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is_preserved_gr = (i >= IA64_REG_R4 && i <= IA64_REG_R7);
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switch (r->where)
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{
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case IA64_WHERE_GR:
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if (rval >= 32)
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{
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/* register got spilled to a stacked register */
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opc = IA64_INSN_MOVE_STACKED;
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val = rval - 32;
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}
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else if (rval >= 4 && rval <= 7)
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/* register got spilled to a preserved register */
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val = unw.preg_index[IA64_REG_R4 + (rval - 4)];
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else
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{
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/* register got spilled to a scratch register */
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opc = IA64_INSN_MOVE_SCRATCH;
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val = UNW_IA64_GR + rval;
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}
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break;
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case IA64_WHERE_FR:
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if (rval <= 5)
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val = unw.preg_index[IA64_REG_F2 + (rval - 1)];
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else if (rval >= 16 && rval <= 31)
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val = unw.preg_index[IA64_REG_F16 + (rval - 16)];
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else
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{
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opc = IA64_INSN_MOVE_SCRATCH;
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val = UNW_IA64_FR + rval;
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}
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break;
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case IA64_WHERE_BR:
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if (rval >= 1 && rval <= 5)
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val = unw.preg_index[IA64_REG_B1 + (rval - 1)];
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else
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{
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opc = IA64_INSN_MOVE_SCRATCH;
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val = UNW_IA64_BR + rval;
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}
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break;
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case IA64_WHERE_SPREL:
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opc = IA64_INSN_ADD_SP;
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if (i >= IA64_REG_F2 && i <= IA64_REG_F31)
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val |= IA64_LOC_TYPE_FP;
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break;
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case IA64_WHERE_PSPREL:
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opc = IA64_INSN_ADD_PSP;
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if (i >= IA64_REG_F2 && i <= IA64_REG_F31)
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val |= IA64_LOC_TYPE_FP;
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break;
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default:
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dprintf ("%s: register %u has unexpected `where' value of %u\n",
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__FUNCTION__, i, r->where);
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break;
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}
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insn.opc = opc;
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insn.dst = unw.preg_index[i];
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insn.val = val;
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script_emit (script, insn);
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if (is_preserved_gr)
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emit_nat_info (sr, i, script);
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if (i == IA64_REG_PSP)
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{
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/* info->psp must contain the _value_ of the previous sp, not
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it's save location. We get this by dereferencing the value
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we just stored in info->psp: */
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insn.opc = IA64_INSN_LOAD;
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insn.dst = insn.val = unw.preg_index[IA64_REG_PSP];
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script_emit (script, insn);
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}
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}
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/* Build an unwind script that unwinds from state OLD_STATE to the
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entrypoint of the function that called OLD_STATE. */
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static inline int
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build_script (struct ia64_cursor *c, struct ia64_script *script)
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{
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struct ia64_state_record sr;
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struct ia64_script_insn insn;
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int i, ret;
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STAT(unsigned long start, parse_start;)
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STAT(++unw.stat.script.builds; start = ia64_get_itc ());
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STAT(unw.stat.script.parse_time += ia64_get_itc () - parse_start);
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ret = ia64_create_state_record (c, &sr);
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if (ret < 0)
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return ret;
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/* First, set psp if we're dealing with a fixed-size frame;
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subsequent instructions may depend on this value. */
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if (sr.when_target > sr.curr.reg[IA64_REG_PSP].when
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&& (sr.curr.reg[IA64_REG_PSP].where == IA64_WHERE_NONE)
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&& sr.curr.reg[IA64_REG_PSP].val != 0)
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{
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/* new psp is psp plus frame size */
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insn.opc = IA64_INSN_ADD;
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insn.dst = struct_offset (struct ia64_cursor, psp) / 8;
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insn.val = sr.curr.reg[IA64_REG_PSP].val; /* frame size */
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script_emit (script, insn);
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}
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/* determine where the primary UNaT is: */
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if (sr.when_target < sr.curr.reg[IA64_REG_PRI_UNAT_GR].when)
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i = IA64_REG_PRI_UNAT_MEM;
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else if (sr.when_target < sr.curr.reg[IA64_REG_PRI_UNAT_MEM].when)
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i = IA64_REG_PRI_UNAT_GR;
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else if (sr.curr.reg[IA64_REG_PRI_UNAT_MEM].when >
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sr.curr.reg[IA64_REG_PRI_UNAT_GR].when)
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i = IA64_REG_PRI_UNAT_MEM;
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else
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i = IA64_REG_PRI_UNAT_GR;
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compile_reg (&sr, i, script);
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for (i = IA64_REG_BSP; i < IA64_NUM_PREGS; ++i)
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compile_reg (&sr, i, script);
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if (sr.is_signal_frame)
|
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{
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insn.opc = IA64_INSN_SET;
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insn.dst = struct_offset (struct ia64_cursor, is_signal_frame) / 8;
|
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insn.val = 1;
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script_emit (script, insn);
|
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}
|
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|
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script_finalize (script, c, &sr);
|
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|
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ia64_free_state_record (&sr);
|
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|
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STAT(unw.stat.script.build_time += ia64_get_itc () - start);
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return 0;
|
||||
}
|
||||
|
||||
/* Apply the unwinding actions represented by OPS and update SR to
|
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reflect the state that existed upon entry to the function that this
|
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unwinder represents. */
|
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|
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static inline int
|
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run_script (struct ia64_script *script, struct ia64_cursor *c)
|
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{
|
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struct ia64_script_insn *ip, *limit, next_insn;
|
||||
unw_word_t val, unat_addr, *s = (unw_word_t *) c;
|
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unsigned long opc, dst;
|
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int ret;
|
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STAT(unsigned long start;)
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|
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STAT(++unw.stat.script.runs; start = ia64_get_itc ());
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c->pi = script->pi;
|
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ip = script->insn;
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limit = script->insn + script->count;
|
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next_insn = *ip;
|
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|
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while (ip++ < limit)
|
||||
{
|
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opc = next_insn.opc;
|
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dst = next_insn.dst;
|
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val = next_insn.val;
|
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next_insn = *ip;
|
||||
|
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switch (opc)
|
||||
{
|
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case IA64_INSN_SET:
|
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s[dst] = val;
|
||||
break;
|
||||
|
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case IA64_INSN_ADD:
|
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s[dst] += val;
|
||||
break;
|
||||
|
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case IA64_INSN_ADD_PSP:
|
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s[dst] = c->psp + val;
|
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break;
|
||||
|
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case IA64_INSN_ADD_SP:
|
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s[dst] = c->sp + val;
|
||||
break;
|
||||
|
||||
case IA64_INSN_MOVE:
|
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s[dst] = s[val];
|
||||
break;
|
||||
|
||||
case IA64_INSN_MOVE_SCRATCH:
|
||||
s[dst] = ia64_scratch_loc (c, val);
|
||||
break;
|
||||
|
||||
case IA64_INSN_MOVE_STACKED:
|
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s[dst] = ia64_rse_skip_regs (c->bsp, val);
|
||||
break;
|
||||
|
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case IA64_INSN_SETNAT_MEMSTK:
|
||||
ret = ia64_get (c, c->pri_unat_loc, &unat_addr);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
s[dst] = IA64_LOC (unat_addr >> 3, IA64_LOC_TYPE_MEMSTK_NAT);
|
||||
break;
|
||||
|
||||
case IA64_INSN_LOAD:
|
||||
ret = ia64_get (c, s[val], &s[dst]);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
break;
|
||||
}
|
||||
}
|
||||
STAT(unw.stat.script.run_time += ia64_get_itc () - start);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
ia64_find_save_locs (struct ia64_cursor *c)
|
||||
{
|
||||
struct ia64_script *script = NULL;
|
||||
int ret = 0;
|
||||
|
||||
if (c->as->caching_policy == UNW_CACHE_NONE)
|
||||
{
|
||||
struct ia64_script tmp_script;
|
||||
|
||||
script = &tmp_script;
|
||||
script->ip = c->ip;
|
||||
script->hint = 0;
|
||||
script->count = 0;
|
||||
ret = build_script (c, script);
|
||||
}
|
||||
else
|
||||
{
|
||||
struct ia64_script_cache *cache = get_script_cache (c->as);
|
||||
|
||||
script = script_lookup (cache, c);
|
||||
if (!script)
|
||||
{
|
||||
script = script_new (cache, c->ip);
|
||||
if (!script)
|
||||
{
|
||||
dprintf ("%s: failed to create unwind script\n", __FUNCTION__);
|
||||
STAT(unw.stat.script.build_time += ia64_get_itc() - start);
|
||||
return -UNW_EUNSPEC;
|
||||
}
|
||||
cache->buckets[c->prev_script].hint = script - cache->buckets;
|
||||
|
||||
ret = build_script (c, script);
|
||||
}
|
||||
c->hint = script->hint;
|
||||
c->prev_script = script - cache->buckets;
|
||||
}
|
||||
if (ret < 0)
|
||||
{
|
||||
if (ret != UNW_ESTOPUNWIND)
|
||||
dprintf ("%s: failed to locate/build unwind script for ip %lx\n",
|
||||
__FUNCTION__, (long) c->ip);
|
||||
return ret;
|
||||
}
|
||||
run_script (script, c);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
ia64_script_cache_init (struct ia64_script_cache *cache)
|
||||
{
|
||||
int i;
|
||||
|
||||
cache->lru_head = IA64_UNW_CACHE_SIZE - 1;
|
||||
cache->lru_tail = 0;
|
||||
|
||||
for (i = 0; i < IA64_UNW_CACHE_SIZE; ++i)
|
||||
{
|
||||
if (i > 0)
|
||||
cache->buckets[i].lru_chain = (i - 1);
|
||||
cache->buckets[i].coll_chain = -1;
|
||||
#if 0
|
||||
/* must be lock-free! */
|
||||
unw.cache[i].lock = RW_LOCK_UNLOCKED;
|
||||
#endif
|
||||
}
|
||||
for (i = 0; i<IA64_UNW_HASH_SIZE; ++i)
|
||||
cache->hash[i] = -1;
|
||||
}
|
||||
Loading…
Reference in a new issue