diff mbox

cpu-exec: Add "nochain" debug flag

Message ID 1442442880-15127-1-git-send-email-rth@twiddle.net
State New
Headers show

Commit Message

Richard Henderson Sept. 16, 2015, 10:34 p.m. UTC 
Respect it to avoid linking TBs together.

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 cpu-exec.c         | 3 ++-
 include/qemu/log.h | 1 +
 qemu-log.c         | 3 +++
 3 files changed, 6 insertions(+), 1 deletion(-)

Comments

Peter Maydell Sept. 17, 2015, 8:35 a.m. UTC | #1 
On 16 September 2015 at 23:34, Richard Henderson <rth@twiddle.net> wrote:
> Respect it to avoid linking TBs together.
>
> Signed-off-by: Richard Henderson <rth@twiddle.net>

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM
diff mbox

Patch

diff --git a/cpu-exec.c b/cpu-exec.c
index 8945533..b219421 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -527,7 +527,8 @@  int cpu_exec(CPUState *cpu)
                 /* 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);
                 }
diff --git a/include/qemu/log.h b/include/qemu/log.h
index f880e66..7de4500 100644
--- a/include/qemu/log.h
+++ b/include/qemu/log.h
@@ -41,6 +41,7 @@  static inline bool qemu_log_enabled(void)
 #define LOG_UNIMP          (1 << 10)
 #define LOG_GUEST_ERROR    (1 << 11)
 #define CPU_LOG_MMU        (1 << 12)
+#define CPU_LOG_TB_NOCHAIN (1 << 13)
 
 /* Returns true if a bit is set in the current loglevel mask
  */
diff --git a/qemu-log.c b/qemu-log.c
index 13f3813..efd07c8 100644
--- a/qemu-log.c
+++ b/qemu-log.c
@@ -119,6 +119,9 @@  const QEMULogItem qemu_log_items[] = {
     { LOG_GUEST_ERROR, "guest_errors",
       "log when the guest OS does something invalid (eg accessing a\n"
       "non-existent register)" },
+    { CPU_LOG_TB_NOCHAIN, "nochain",
+      "do not chain compiled TBs so that \"exec\" and \"cpu\" show\n"
+      "complete traces" },
     { 0, NULL, NULL },
 };