commit 89a82cd4b6a90fe117fa715e2abe51d5c607560c
author Richard Henderson <rth@twiddle.net> Wed Sep 16 15:33:53 2015 -0700
committer Richard Henderson <rth@twiddle.net> Mon Oct 19 11:04:39 2015 -1000
tree 8918e2af85a3241d228a299e5825a34a8ff20963
parent 137d63902faf4960081856db9242cbaf234a23af

cpu-exec: Add "nochain" debug flag

Respect it to avoid linking TBs together.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>

cpu-exec.c

diff --git a/cpu-exec.c b/cpu-exec.c
index 8fd56a6..7eef083 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -477,7 +477,8 @@
                 /* see if we can patch the calling TB. When the TB
                    spans two pages, we cannot safely do a direct
                    jump. */
-                if (next_tb != 0 && tb->page_addr[1] == -1) {
+                if (next_tb != 0 && tb->page_addr[1] == -1
+                    && !qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
                     tb_add_jump((TranslationBlock *)(next_tb & ~TB_EXIT_MASK),
                                 next_tb & TB_EXIT_MASK, tb);
                 }