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[PULL,02/26] target/arm: LDAPR should honour SCTLR_ELx.nAA

Message ID 20240718132028.697927-3-peter.maydell@linaro.org
State Accepted
Commit 25489b521b61b874c4c6583956db0012a3674e3a
Headers show
Series [PULL,01/26] target/arm: Fix handling of LDAPR/STLR with negative offset | expand

Commit Message

Peter Maydell July 18, 2024, 1:20 p.m. UTC 
In commit c1a1f80518d360b when we added the FEAT_LSE2 relaxations to
the alignment requirements for atomic and ordered loads and stores,
we didn't quite get it right for LDAPR/LDAPRH/LDAPRB with no
immediate offset.  These instructions were handled in the old decoder
as part of disas_ldst_atomic(), but unlike all the other insns that
function decoded (LDADD, LDCLR, etc) these insns are "ordered", not
"atomic", so they should be using check_ordered_align() rather than
check_atomic_align().  Commit c1a1f80518d360b used
check_atomic_align() regardless for everything in
disas_ldst_atomic().  We then carried that incorrect check over in
the decodetree conversion, where LDAPR/LDAPRH/LDAPRB are now handled
by trans_LDAPR().

The effect is that when FEAT_LSE2 is implemented, these instructions
don't honour the SCTLR_ELx.nAA bit and will generate alignment
faults when they should not.

(The LDAPR insns with an immediate offset were in disas_ldst_ldapr_stlr()
and then in trans_LDAPR_i() and trans_STLR_i(), and have always used
the correct check_ordered_align().)

Use check_ordered_align() in trans_LDAPR().

Cc: qemu-stable@nongnu.org
Fixes: c1a1f80518d360b ("target/arm: Relax ordered/atomic alignment checks for LSE2")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240709134504.3500007-3-peter.maydell@linaro.org
---
 target/arm/tcg/translate-a64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index 559a6cd799d..148be2826ec 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -3543,7 +3543,7 @@  static bool trans_LDAPR(DisasContext *s, arg_LDAPR *a)
     if (a->rn == 31) {
         gen_check_sp_alignment(s);
     }
-    mop = check_atomic_align(s, a->rn, a->sz);
+    mop = check_ordered_align(s, a->rn, 0, false, a->sz);
     clean_addr = gen_mte_check1(s, cpu_reg_sp(s, a->rn), false,
                                 a->rn != 31, mop);
     /*