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accel/tcg: Introduce translator_use_goto_tb
Add a generic version of the common use_goto_tb test. Various targets avoid the page crossing test for CONFIG_USER_ONLY, but that is wrong: mmap and mprotect can change page permissions. Reviewed-by: Max Filippov <jcmvbkbc@gmail.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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@ -31,6 +31,17 @@ void translator_loop_temp_check(DisasContextBase *db)
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}
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}
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bool translator_use_goto_tb(DisasContextBase *db, target_ulong dest)
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{
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/* Suppress goto_tb in the case of single-steping. */
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if (db->singlestep_enabled || singlestep) {
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return false;
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}
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/* Check for the dest on the same page as the start of the TB. */
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return ((db->pc_first ^ dest) & TARGET_PAGE_MASK) == 0;
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}
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void translator_loop(const TranslatorOps *ops, DisasContextBase *db,
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CPUState *cpu, TranslationBlock *tb, int max_insns)
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{
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@ -145,6 +145,16 @@ void translator_loop(const TranslatorOps *ops, DisasContextBase *db,
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void translator_loop_temp_check(DisasContextBase *db);
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/**
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* translator_use_goto_tb
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* @db: Disassembly context
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* @dest: target pc of the goto
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*
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* Return true if goto_tb is allowed between the current TB
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* and the destination PC.
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*/
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bool translator_use_goto_tb(DisasContextBase *db, target_ulong dest);
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/*
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* Translator Load Functions
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*
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