@@ -1701,6 +1701,9 @@ static void disas_insn_new(DisasContext *s, CPUState *cpu, int b)
X86DecodedInsn decode;
X86DecodeFunc decode_func = decode_root;
+#ifdef CONFIG_USER_ONLY
+ if (limit) { --limit; }
+#endif
s->has_modrm = false;
next_byte:
@@ -2980,6 +2980,9 @@ static void gen_sty_env_A0(DisasContext *s, int offset, bool align)
tcg_gen_qemu_st_i64(s->tmp1_i64, s->tmp0, mem_index, MO_LEUQ);
}
+static bool first = true;
+static unsigned long limit;
+
#include "decode-new.h"
#include "emit.c.inc"
#include "decode-new.c.inc"
@@ -3134,15 +3137,39 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
prefixes = 0;
+ if (first) {
+ const char *env = getenv("QEMU_I386_LIMIT");
+ limit = env ? atol(env) : -1;
+ first = false;
+ }
+ bool use_new = true;
+#ifdef CONFIG_USER_ONLY
+ use_new &= limit > 0;
+#endif
+
next_byte:
s->prefix = prefixes;
b = x86_ldub_code(env, s);
/* Collect prefixes. */
switch (b) {
default:
+#ifndef CONFIG_USER_ONLY
+ use_new &= b <= limit;
+#endif
+ if (use_new && 0) {
+ disas_insn_new(s, cpu, b);
+ return true;
+ }
break;
case 0x0f:
b = x86_ldub_code(env, s) + 0x100;
+#ifndef CONFIG_USER_ONLY
+ use_new &= b <= limit;
+#endif
+ if (use_new && 0) {
+ disas_insn_new(s, cpu, b);
+ return true;
+ }
break;
case 0xf3:
prefixes |= PREFIX_REPZ;
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> --- target/i386/tcg/decode-new.c.inc | 3 +++ target/i386/tcg/translate.c | 27 +++++++++++++++++++++++++++ 2 files changed, 30 insertions(+)