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target/microblaze: Introduce DISAS_EXIT_NEXT, DISAS_EXIT_JUMP 

Like DISAS_EXIT, except we need to update cpu_pc,
either to pc_next or to btarget respectively.

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-08-31 09:34:01 -07:00
parent 17e7779652
commit f6278ca969
1 changed files with 21 additions and 8 deletions
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29
target/microblaze/translate.c
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@ -39,6 +39,11 @@
#define DISAS_JUMP DISAS_TARGET_0 /* only pc was modified dynamically */
#define DISAS_EXIT DISAS_TARGET_1 /* all cpu state modified dynamically */
/* cpu state besides pc was modified dynamically; update pc to next */
#define DISAS_EXIT_NEXT DISAS_TARGET_2
/* cpu state besides pc was modified dynamically; update pc to btarget */
#define DISAS_EXIT_JUMP DISAS_TARGET_3
static TCGv_i32 cpu_R[32];
static TCGv_i32 cpu_pc;
static TCGv_i32 cpu_msr;
@ -1712,8 +1717,7 @@ static void mb_tr_translate_insn(DisasContextBase *dcb, CPUState *cs)
/* Force an exit if the per-tb cpu state has changed. */
if (dc->base.is_jmp == DISAS_NEXT && dc->cpustate_changed) {
dc->base.is_jmp = DISAS_EXIT;
tcg_gen_movi_i32(cpu_pc, dc->base.pc_next);
dc->base.is_jmp = DISAS_EXIT_NEXT;
}
}
@ -1734,12 +1738,14 @@ static void mb_tr_tb_stop(DisasContextBase *dcb, CPUState *cs)
return;
case DISAS_EXIT:
if (unlikely(cs->singlestep_enabled)) {
gen_raise_exception(dc, EXCP_DEBUG);
} else {
tcg_gen_exit_tb(NULL, 0);
}
return;
break;
case DISAS_EXIT_NEXT:
tcg_gen_movi_i32(cpu_pc, dc->base.pc_next);
break;
case DISAS_EXIT_JUMP:
tcg_gen_mov_i32(cpu_pc, cpu_btarget);
tcg_gen_discard_i32(cpu_btarget);
break;
case DISAS_JUMP:
if (dc->jmp_dest != -1 && !cs->singlestep_enabled) {
@ -1781,6 +1787,13 @@ static void mb_tr_tb_stop(DisasContextBase *dcb, CPUState *cs)
default:
g_assert_not_reached();
}
/* Finish DISAS_EXIT_* */
if (unlikely(cs->singlestep_enabled)) {
gen_raise_exception(dc, EXCP_DEBUG);
} else {
tcg_gen_exit_tb(NULL, 0);
}
}
static void mb_tr_disas_log(const DisasContextBase *dcb, CPUState *cs)