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tcg: Introduce goto_ptr opcode and tcg_gen_lookup_and_goto_ptr

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Instead of exporting goto_ptr directly to TCG frontends, export
tcg_gen_lookup_and_goto_ptr(), which calls goto_ptr with the pointer
returned by the lookup_tb_ptr() helper. This is the only use case
we have for goto_ptr and lookup_tb_ptr, so having this function is
very convenient. Furthermore, it trivially allows us to avoid calling
the lookup helper if goto_ptr is not implemented by the backend.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1493263764-18657-2-git-send-email-cota@braap.org>
Message-Id: <1493263764-18657-3-git-send-email-cota@braap.org>
Message-Id: <1493263764-18657-4-git-send-email-cota@braap.org>
Message-Id: <1493263764-18657-5-git-send-email-cota@braap.org>
[rth: Squashed 4 related commits.]
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Emilio G. Cota 2017-04-26 23:29:14 -04:00 • committed by Richard Henderson
parent 374aae6534
commit cedbcb0152
19 changed files with 85 additions and 4 deletions
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32
tcg-runtime.c
View file

@ -27,6 +27,9 @@
#include "exec/helper-proto.h"
#include "exec/cpu_ldst.h"
#include "exec/exec-all.h"
#include "exec/tb-hash.h"
#include "disas/disas.h"
#include "exec/log.h"
/* 32-bit helpers */
@ -141,6 +144,35 @@ uint64_t HELPER(ctpop_i64)(uint64_t arg)
return ctpop64(arg);
}
void *HELPER(lookup_tb_ptr)(CPUArchState *env, target_ulong addr)
{
CPUState *cpu = ENV_GET_CPU(env);
TranslationBlock *tb;
target_ulong cs_base, pc;
uint32_t flags;
tb = atomic_rcu_read(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(addr)]);
if (likely(tb)) {
cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
if (likely(tb->pc == addr && tb->cs_base == cs_base &&
tb->flags == flags)) {
goto found;
}
tb = tb_htable_lookup(cpu, addr, cs_base, flags);
if (likely(tb)) {
atomic_set(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(addr)], tb);
goto found;
}
}
return tcg_ctx.code_gen_epilogue;
found:
qemu_log_mask_and_addr(CPU_LOG_EXEC, addr,
"Chain %p [%d: " TARGET_FMT_lx "] %s\n",
tb->tc_ptr, cpu->cpu_index, addr,
lookup_symbol(addr));
return tb->tc_ptr;
}
void HELPER(exit_atomic)(CPUArchState *env)
{
cpu_loop_exit_atomic(ENV_GET_CPU(env), GETPC());