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target/arm/translate.h: expand comment on DISAS_EXIT 

We already have an exit condition, DISAS_UPDATE which will exit the
run-loop. Expand on the difference with DISAS_EXIT in the comments.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-id: 20170713141928.25419-4-alex.bennee@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alex Bennée 2017-07-17 13:36:07 +01:00 committed by Peter Maydell
parent e8d5230221
commit abd1fb0ee2
1 changed files with 4 additions and 1 deletions
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5
target/arm/translate.h
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@ -140,7 +140,10 @@ static void disas_set_insn_syndrome(DisasContext *s, uint32_t syn)
*/
#define DISAS_BX_EXCRET 11
/* For instructions which want an immediate exit to the main loop,
* as opposed to attempting to use lookup_and_goto_ptr.
* as opposed to attempting to use lookup_and_goto_ptr. Unlike
* DISAS_UPDATE this doesn't write the PC on exiting the translation
* loop so you need to ensure something (gen_a64_set_pc_im or runtime
* helper) has done so before we reach return from cpu_tb_exec.
*/
#define DISAS_EXIT 12