From 11c1d5f8ca7a72818b3c24093a2c40856022fe0f Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Mon, 19 Jul 2021 12:40:57 -1000
Subject: [PATCH] accel/tcg: Merge tb_find into its only caller
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

We are going to want two things:
(1) check for breakpoints will want to break out of the loop here,
(2) cflags can only be calculated with pc in hand.

Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/cpu-exec.c | 85 ++++++++++++++++++++++++++--------------------------
 1 file changed, 42 insertions(+), 43 deletions(-)

diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index 5bb099174f..cde7069eb7 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -500,41 +500,6 @@ static inline void tb_add_jump(TranslationBlock *tb, int n,
     return;
 }
 
-static inline TranslationBlock *tb_find(CPUState *cpu,
-                                        TranslationBlock *last_tb,
-                                        int tb_exit, uint32_t cflags)
-{
-    CPUArchState *env = (CPUArchState *)cpu->env_ptr;
-    TranslationBlock *tb;
-    target_ulong cs_base, pc;
-    uint32_t flags;
-
-    cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
-
-    tb = tb_lookup(cpu, pc, cs_base, flags, cflags);
-    if (tb == NULL) {
-        mmap_lock();
-        tb = tb_gen_code(cpu, pc, cs_base, flags, cflags);
-        mmap_unlock();
-        /* We add the TB in the virtual pc hash table for the fast lookup */
-        qatomic_set(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)], tb);
-    }
-#ifndef CONFIG_USER_ONLY
-    /* We don't take care of direct jumps when address mapping changes in
-     * system emulation. So it's not safe to make a direct jump to a TB
-     * spanning two pages because the mapping for the second page can change.
-     */
-    if (tb->page_addr[1] != -1) {
-        last_tb = NULL;
-    }
-#endif
-    /* See if we can patch the calling TB. */
-    if (last_tb) {
-        tb_add_jump(last_tb, tb_exit, tb);
-    }
-    return tb;
-}
-
 static inline bool cpu_handle_halt(CPUState *cpu)
 {
     if (cpu->halted) {
@@ -868,22 +833,56 @@ int cpu_exec(CPUState *cpu)
         int tb_exit = 0;
 
         while (!cpu_handle_interrupt(cpu, &last_tb)) {
-            uint32_t cflags = cpu->cflags_next_tb;
             TranslationBlock *tb;
-
-            /* When requested, use an exact setting for cflags for the next
-               execution.  This is used for icount, precise smc, and stop-
-               after-access watchpoints.  Since this request should never
-               have CF_INVALID set, -1 is a convenient invalid value that
-               does not require tcg headers for cpu_common_reset.  */
+            target_ulong cs_base, pc;
+            uint32_t flags, cflags;
+
+            /*
+             * When requested, use an exact setting for cflags for the next
+             * execution.  This is used for icount, precise smc, and stop-
+             * after-access watchpoints.  Since this request should never
+             * have CF_INVALID set, -1 is a convenient invalid value that
+             * does not require tcg headers for cpu_common_reset.
+             */
+            cflags = cpu->cflags_next_tb;
             if (cflags == -1) {
                 cflags = curr_cflags(cpu);
             } else {
                 cpu->cflags_next_tb = -1;
             }
 
-            tb = tb_find(cpu, last_tb, tb_exit, cflags);
+            cpu_get_tb_cpu_state(cpu->env_ptr, &pc, &cs_base, &flags);
+
+            tb = tb_lookup(cpu, pc, cs_base, flags, cflags);
+            if (tb == NULL) {
+                mmap_lock();
+                tb = tb_gen_code(cpu, pc, cs_base, flags, cflags);
+                mmap_unlock();
+                /*
+                 * We add the TB in the virtual pc hash table
+                 * for the fast lookup
+                 */
+                qatomic_set(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)], tb);
+            }
+
+#ifndef CONFIG_USER_ONLY
+            /*
+             * We don't take care of direct jumps when address mapping
+             * changes in system emulation.  So it's not safe to make a
+             * direct jump to a TB spanning two pages because the mapping
+             * for the second page can change.
+             */
+            if (tb->page_addr[1] != -1) {
+                last_tb = NULL;
+            }
+#endif
+            /* See if we can patch the calling TB. */
+            if (last_tb) {
+                tb_add_jump(last_tb, tb_exit, tb);
+            }
+
             cpu_loop_exec_tb(cpu, tb, &last_tb, &tb_exit);
+
             /* Try to align the host and virtual clocks
                if the guest is in advance */
             align_clocks(&sc, cpu);
-- 
2.11.4.GIT