accel/tcg: re-factor non-RAM execution code
There is no real need to use CF_NOCACHE here. As long as the TB isn't linked to other TBs or included in the QHT or jump cache then it will only get executed once. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20210213130325.14781-19-alex.bennee@linaro.org>
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@ -1779,7 +1779,8 @@ static inline void tb_page_add(PageDesc *p, TranslationBlock *tb,
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#endif
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}
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/* add a new TB and link it to the physical page tables. phys_page2 is
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/*
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* Add a new TB and link it to the physical page tables. phys_page2 is
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* (-1) to indicate that only one page contains the TB.
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*
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* Called with mmap_lock held for user-mode emulation.
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@ -1798,17 +1799,6 @@ tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc,
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assert_memory_lock();
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if (phys_pc == -1) {
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/*
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* If the TB is not associated with a physical RAM page then
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* it must be a temporary one-insn TB, and we have nothing to do
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* except fill in the page_addr[] fields.
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*/
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assert(tb->cflags & CF_NOCACHE);
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tb->page_addr[0] = tb->page_addr[1] = -1;
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return tb;
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}
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/*
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* Add the TB to the page list, acquiring first the pages's locks.
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* We keep the locks held until after inserting the TB in the hash table,
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@ -1881,9 +1871,8 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
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phys_pc = get_page_addr_code(env, pc);
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if (phys_pc == -1) {
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/* Generate a temporary TB with 1 insn in it */
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cflags &= ~CF_COUNT_MASK;
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cflags |= CF_NOCACHE | 1;
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/* Generate a one-shot TB with 1 insn in it */
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cflags = (cflags & ~CF_COUNT_MASK) | 1;
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}
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cflags &= ~CF_CLUSTER_MASK;
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@ -2097,6 +2086,17 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
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tb_reset_jump(tb, 1);
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}
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/*
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* If the TB is not associated with a physical RAM page then
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* it must be a temporary one-insn TB, and we have nothing to do
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* except fill in the page_addr[] fields. Return early before
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* attempting to link to other TBs or add to the lookup table.
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*/
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if (phys_pc == -1) {
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tb->page_addr[0] = tb->page_addr[1] = -1;
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return tb;
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}
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/* check next page if needed */
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virt_page2 = (pc + tb->size - 1) & TARGET_PAGE_MASK;
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phys_page2 = -1;
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