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target/arm: Add DISAS_UPDATE_NOCHAIN

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Add an option that writes back the PC, like DISAS_UPDATE_EXIT,
but does not exit back to the main loop.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200626033144.790098-7-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2020-06-25 20:31:04 -07:00 committed by Peter Maydell
parent 14407ec200
commit 329833286d
3 changed files with 9 additions and 0 deletions
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3
target/arm/translate-a64.c
View file

@ -14298,6 +14298,9 @@ static void aarch64_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
case DISAS_EXIT:
tcg_gen_exit_tb(NULL, 0);
break;
case DISAS_UPDATE_NOCHAIN:
gen_a64_set_pc_im(dc->base.pc_next);
/* fall through */
case DISAS_JUMP:
tcg_gen_lookup_and_goto_ptr();
break;

4
target/arm/translate.c
View file

@ -8874,6 +8874,7 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
case DISAS_NEXT:
case DISAS_TOO_MANY:
case DISAS_UPDATE_EXIT:
case DISAS_UPDATE_NOCHAIN:
gen_set_pc_im(dc, dc->base.pc_next);
/* fall through */
default:
@ -8897,6 +8898,9 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
case DISAS_TOO_MANY:
gen_goto_tb(dc, 1, dc->base.pc_next);
break;
case DISAS_UPDATE_NOCHAIN:
gen_set_pc_im(dc, dc->base.pc_next);
/* fall through */
case DISAS_JUMP:
gen_goto_ptr();
break;

2
target/arm/translate.h
View file

@ -173,6 +173,8 @@ static inline void disas_set_insn_syndrome(DisasContext *s, uint32_t syn)
* return from cpu_tb_exec.
*/
#define DISAS_EXIT DISAS_TARGET_9
/* CPU state was modified dynamically; no need to exit, but do not chain. */
#define DISAS_UPDATE_NOCHAIN DISAS_TARGET_10
#ifdef TARGET_AARCH64
void a64_translate_init(void);