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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.

Backports commit 329833286d7a1b0ef8c7daafe13c6ae32429694e from qemu
This commit is contained in:
Richard Henderson 2021-02-25 14:04:16 -05:00 committed by Lioncash
parent eaa6291aa7
commit 179a3aacdf
3 changed files with 9 additions and 0 deletions
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3
qemu/target/arm/translate-a64.c
View file

@ -14626,6 +14626,9 @@ static void aarch64_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
case DISAS_EXIT:
tcg_gen_exit_tb(tcg_ctx, NULL, 0);
break;
case DISAS_UPDATE_NOCHAIN:
gen_a64_set_pc_im(dc, dc->base.pc_next);
/* fall through */
case DISAS_JUMP:
tcg_gen_lookup_and_goto_ptr(tcg_ctx);
break;

4
qemu/target/arm/translate.c
View file

@ -9165,6 +9165,7 @@ 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:
@ -9188,6 +9189,9 @@ 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(dc);
break;

2
qemu/target/arm/translate.h
View file

@ -176,6 +176,8 @@ 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(struct uc_struct *uc);