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target/arm: use gen_goto_tb for ISB handling 

While an ISB will ensure any raised IRQs happen on the next
instruction it doesn't cause any to get raised by itself. We can
therefore use a simple tb exit for ISB instructions and rely on the
exit_request check at the top of each TB to deal with exiting if
needed.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-id: 20170713141928.25419-6-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 4cae8f56fb
commit 0b609cc128
2 changed files with 3 additions and 3 deletions
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2
target/arm/translate-a64.c
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@ -1393,7 +1393,7 @@ static void handle_sync(DisasContext *s, uint32_t insn,
* a self-modified code correctly and also to take
* any pending interrupts immediately.
*/
s->is_jmp = DISAS_UPDATE;
gen_goto_tb(s, 0, s->pc);
return;
default:
unallocated_encoding(s);

4
target/arm/translate.c
View File

@ -8169,7 +8169,7 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
* self-modifying code correctly and also to take
* any pending interrupts immediately.
*/
gen_lookup_tb(s);
gen_goto_tb(s, 0, s->pc & ~1);
return;
default:
goto illegal_op;
@ -10562,7 +10562,7 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw
* and also to take any pending interrupts
* immediately.
*/
gen_lookup_tb(s);
gen_goto_tb(s, 0, s->pc & ~1);
break;
default:
goto illegal_op;