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

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

Backports commit abd1fb0ee2c58b99f4b2d15718f1825fe4984e12 from qemu
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Alex Bennée 2018-03-03 22:36:22 -05:00 committed by Lioncash
parent 63d40e1a55
commit bffa25cc07
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qemu/target/arm/translate.h
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@ -139,7 +139,10 @@ 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