Commit 89a82cd4 authored by Richard Henderson's avatar Richard Henderson
Browse files

cpu-exec: Add "nochain" debug flag 



Respect it to avoid linking TBs together.

Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent 137d6390

cpu-exec.c

+2 −1
Original line number Diff line number Diff line
@@ -477,7 +477,8 @@ 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);

                }

include/qemu/log.h

+1 −0
Original line number Diff line number Diff line
@@ -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

 */

qemu-log.c

+3 −0
Original line number Diff line number Diff line
@@ -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 },

};