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>
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@ -477,7 +477,8 @@ int cpu_exec(CPUState *cpu)
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/* see if we can patch the calling TB. When the TB
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/* see if we can patch the calling TB. When the TB
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spans two pages, we cannot safely do a direct
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spans two pages, we cannot safely do a direct
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jump. */
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jump. */
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if (next_tb != 0 && tb->page_addr[1] == -1) {
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if (next_tb != 0 && tb->page_addr[1] == -1
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&& !qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
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tb_add_jump((TranslationBlock *)(next_tb & ~TB_EXIT_MASK),
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tb_add_jump((TranslationBlock *)(next_tb & ~TB_EXIT_MASK),
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next_tb & TB_EXIT_MASK, tb);
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next_tb & TB_EXIT_MASK, tb);
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}
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}
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@ -41,6 +41,7 @@ static inline bool qemu_log_enabled(void)
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#define LOG_UNIMP (1 << 10)
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#define LOG_UNIMP (1 << 10)
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#define LOG_GUEST_ERROR (1 << 11)
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#define LOG_GUEST_ERROR (1 << 11)
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#define CPU_LOG_MMU (1 << 12)
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#define CPU_LOG_MMU (1 << 12)
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#define CPU_LOG_TB_NOCHAIN (1 << 13)
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/* Returns true if a bit is set in the current loglevel mask
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/* Returns true if a bit is set in the current loglevel mask
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*/
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*/
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@ -119,6 +119,9 @@ const QEMULogItem qemu_log_items[] = {
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{ LOG_GUEST_ERROR, "guest_errors",
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{ LOG_GUEST_ERROR, "guest_errors",
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"log when the guest OS does something invalid (eg accessing a\n"
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"log when the guest OS does something invalid (eg accessing a\n"
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"non-existent register)" },
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"non-existent register)" },
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{ CPU_LOG_TB_NOCHAIN, "nochain",
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"do not chain compiled TBs so that \"exec\" and \"cpu\" show\n"
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"complete traces" },
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{ 0, NULL, NULL },
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{ 0, NULL, NULL },
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};
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};
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