From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: edgar.iglesias@xilinx.com
Subject: [PATCH 5/7] target/microblaze: Force rtid, rted, rtbd to exit
Date: Wed, 2 Sep 2020 09:35:57 -0700 [thread overview]
Message-ID: <20200902163559.1077728-6-richard.henderson@linaro.org> (raw)
In-Reply-To: <20200902163559.1077728-1-richard.henderson@linaro.org>
These return-from-exception type instructions have modified
MSR to re-enable various forms of interrupt. Force a return
to the main loop.
Consolidate the cleanup of tb_flags into mb_tr_translate_insn.
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>
---
target/microblaze/translate.c | 27 ++++++++++++++++-----------
1 file changed, 16 insertions(+), 11 deletions(-)
diff --git a/target/microblaze/translate.c b/target/microblaze/translate.c
index 459b25f8b9..a94f3e340e 100644
--- a/target/microblaze/translate.c
+++ b/target/microblaze/translate.c
@@ -1518,7 +1518,6 @@ static void do_rti(DisasContext *dc)
tcg_gen_or_i32(cpu_msr, cpu_msr, tmp);
tcg_temp_free_i32(tmp);
- dc->tb_flags &= ~DRTI_FLAG;
}
static void do_rtb(DisasContext *dc)
@@ -1531,7 +1530,6 @@ static void do_rtb(DisasContext *dc)
tcg_gen_or_i32(cpu_msr, cpu_msr, tmp);
tcg_temp_free_i32(tmp);
- dc->tb_flags &= ~DRTB_FLAG;
}
static void do_rte(DisasContext *dc)
@@ -1545,7 +1543,6 @@ static void do_rte(DisasContext *dc)
tcg_gen_or_i32(cpu_msr, cpu_msr, tmp);
tcg_temp_free_i32(tmp);
- dc->tb_flags &= ~DRTE_FLAG;
}
/* Insns connected to FSL or AXI stream attached devices. */
@@ -1700,12 +1697,16 @@ static void mb_tr_translate_insn(DisasContextBase *dcb, CPUState *cs)
* Finish any return-from branch.
* TODO: Diagnose rtXd in delay slot of rtYd earlier.
*/
- if (dc->tb_flags & DRTI_FLAG) {
- do_rti(dc);
- } else if (dc->tb_flags & DRTB_FLAG) {
- do_rtb(dc);
- } else if (dc->tb_flags & DRTE_FLAG) {
- do_rte(dc);
+ uint32_t rt_ibe = dc->tb_flags & (DRTI_FLAG | DRTB_FLAG | DRTE_FLAG);
+ if (unlikely(rt_ibe != 0)) {
+ dc->tb_flags &= ~(DRTI_FLAG | DRTB_FLAG | DRTE_FLAG);
+ if (rt_ibe & DRTI_FLAG) {
+ do_rti(dc);
+ } else if (rt_ibe & DRTB_FLAG) {
+ do_rtb(dc);
+ } else {
+ do_rte(dc);
+ }
}
/* Complete the branch, ending the TB. */
@@ -1723,8 +1724,12 @@ static void mb_tr_translate_insn(DisasContextBase *dcb, CPUState *cs)
*/
break;
case DISAS_NEXT:
- /* Normal insn a delay slot. */
- dc->base.is_jmp = DISAS_JUMP;
+ /*
+ * Normal insn a delay slot.
+ * However, the return-from-exception type insns should
+ * return to the main loop, as they have adjusted MSR.
+ */
+ dc->base.is_jmp = (rt_ibe ? DISAS_EXIT_JUMP : DISAS_JUMP);
break;
case DISAS_EXIT_NEXT:
/*
--
2.25.1
next prev parent reply other threads:[~2020-09-02 16:39 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-02 16:35 [PATCH 0/7] target/microblaze improvements Richard Henderson
2020-09-02 16:35 ` [PATCH 1/7] target/microblaze: Rename DISAS_UPDATE to DISAS_EXIT Richard Henderson
2020-09-02 16:35 ` [PATCH 2/7] target/microblaze: Introduce DISAS_EXIT_NEXT, DISAS_EXIT_JUMP Richard Henderson
2020-09-02 16:35 ` [PATCH 3/7] target/microblaze: Replace cpustate_changed with DISAS_EXIT_NEXT Richard Henderson
2020-09-02 16:35 ` [PATCH 4/7] target/microblaze: Handle DISAS_EXIT_NEXT in delay slot Richard Henderson
2020-09-02 16:35 ` Richard Henderson [this message]
2020-09-02 16:35 ` [PATCH 6/7] target/microblaze: Use tcg_gen_lookup_and_goto_ptr Richard Henderson
2020-09-02 16:35 ` [PATCH 7/7] target/microblaze: Diagnose invalid insns in delay slots Richard Henderson
2020-09-02 17:13 ` Philippe Mathieu-Daudé
2020-09-02 18:03 ` Richard Henderson
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