From: pbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Mon, 31 Mar 2008 17:07:36 +0000 (+0000)
Subject: TCG op size estimation fix.
X-Git-Tag: TizenStudio_2.0_p2.3~12068
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a208e54a2f97494ccb5f7ba0b852cc1e308ab668;p=sdk%2Femulator%2Fqemu.git

TCG op size estimation fix.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4154 c046a42c-6fe2-441c-8c8c-71466251a162
---

diff --git a/exec-all.h b/exec-all.h
index 62b8191..898cf68 100644
--- a/exec-all.h
+++ b/exec-all.h
@@ -36,6 +36,12 @@ struct TranslationBlock;
 #define OPC_BUF_SIZE 512
 #define OPC_MAX_SIZE (OPC_BUF_SIZE - MAX_OP_PER_INSTR)
 
+/* Maximum size a TCG op can expand to.  This is complicated because a
+   single op may require several host instructions and regirster reloads.
+   For now take a wild guess at 128 bytes, which should allow at least
+   a couple of fixup instructions per argument.  */
+#define TCG_MAX_OP_SIZE 128
+
 #define OPPARAM_BUF_SIZE (OPC_BUF_SIZE * MAX_OPC_PARAM)
 
 extern target_ulong gen_opc_pc[OPC_BUF_SIZE];
diff --git a/exec.c b/exec.c
index 48dabd6..8015202 100644
--- a/exec.c
+++ b/exec.c
@@ -367,6 +367,9 @@ void tb_flush(CPUState *env1)
            nb_tbs, nb_tbs > 0 ?
            ((unsigned long)(code_gen_ptr - code_gen_buffer)) / nb_tbs : 0);
 #endif
+    if ((unsigned long)(code_gen_ptr - code_gen_buffer) > CODE_GEN_BUFFER_SIZE)
+        cpu_abort(env1, "Internal error: code buffer overflow\n");
+
     nb_tbs = 0;
 
     for(env = first_cpu; env != NULL; env = env->next_cpu) {
diff --git a/translate-all.c b/translate-all.c
index 6a273a8..061bb90 100644
--- a/translate-all.c
+++ b/translate-all.c
@@ -71,6 +71,7 @@ unsigned long code_gen_max_block_size(void)
     static unsigned long max;
 
     if (max == 0) {
+        max = TCG_MAX_OP_SIZE;
 #define DEF(s, n, copy_size) max = copy_size > max? copy_size : max;
 #include "tcg-opc.h"
 #undef DEF