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[Qemu-arm] [PATCH v2 01/13] exec-all: add tb_from_jmp_cache
From: |
Emilio G. Cota |
Subject: |
[Qemu-arm] [PATCH v2 01/13] exec-all: add tb_from_jmp_cache |
Date: |
Tue, 25 Apr 2017 03:53:47 -0400 |
This paves the way for upcoming changes.
Signed-off-by: Emilio G. Cota <address@hidden>
---
cpu-exec.c | 19 +++++++++++++++++++
include/exec/exec-all.h | 2 +-
2 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/cpu-exec.c b/cpu-exec.c
index 63a56d0..b4adf16 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -309,6 +309,25 @@ static bool tb_cmp(const void *p, const void *d)
return false;
}
+TranslationBlock *tb_from_jmp_cache(CPUArchState *env, target_ulong vaddr)
+{
+ CPUState *cpu = ENV_GET_CPU(env);
+ TranslationBlock *tb;
+ target_ulong cs_base, pc;
+ uint32_t flags;
+
+ if (unlikely(atomic_read(&cpu->exit_request))) {
+ return NULL;
+ }
+ cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
+ tb = atomic_rcu_read(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(vaddr)]);
+ if (likely(tb && tb->pc == vaddr && tb->cs_base == cs_base &&
+ tb->flags == flags)) {
+ return tb;
+ }
+ return NULL;
+}
+
static TranslationBlock *tb_htable_lookup(CPUState *cpu,
target_ulong pc,
target_ulong cs_base,
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index bcde1e6..18b80bc 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -56,7 +56,6 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
target_ulong pc, target_ulong cs_base,
uint32_t flags,
int cflags);
-
void QEMU_NORETURN cpu_loop_exit(CPUState *cpu);
void QEMU_NORETURN cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc);
void QEMU_NORETURN cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc);
@@ -368,6 +367,7 @@ struct TranslationBlock {
void tb_free(TranslationBlock *tb);
void tb_flush(CPUState *cpu);
void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
+TranslationBlock *tb_from_jmp_cache(CPUArchState *env, target_ulong vaddr);
#if defined(USE_DIRECT_JUMP)
--
2.7.4