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| author | Richard Henderson <richard.henderson@linaro.org> | 2021-06-20 15:28:18 -0700 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2021-07-09 09:41:53 -0700 |
| commit | d3a2a1d80331b437bcfa0dc43f2c447d3104898e (patch) | |
| tree | 3e176b3bc1ca11497fa2737892fe28cf16caddb4 /accel | |
| parent | a4390647f7af6b8a539571b44ab537478f0ae548 (diff) | |
| download | qemu-d3a2a1d80331b437bcfa0dc43f2c447d3104898e.zip qemu-d3a2a1d80331b437bcfa0dc43f2c447d3104898e.tar.gz qemu-d3a2a1d80331b437bcfa0dc43f2c447d3104898e.tar.bz2 | |
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>
Diffstat (limited to 'accel')
| -rw-r--r-- | accel/tcg/translator.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/accel/tcg/translator.c b/accel/tcg/translator.c index 1d32732..59804af 100644 --- a/accel/tcg/translator.c +++ b/accel/tcg/translator.c @@ -31,6 +31,17 @@ void translator_loop_temp_check(DisasContextBase *db) } } +bool translator_use_goto_tb(DisasContextBase *db, target_ulong dest) +{ + /* Suppress goto_tb in the case of single-steping. */ + if (db->singlestep_enabled || singlestep) { + return false; + } + + /* Check for the dest on the same page as the start of the TB. */ + return ((db->pc_first ^ dest) & TARGET_PAGE_MASK) == 0; +} + void translator_loop(const TranslatorOps *ops, DisasContextBase *db, CPUState *cpu, TranslationBlock *tb, int max_insns) { |