target/arm: Fix syndrome for FGT traps on ERET

In commit 442c9d682c94fc2 when we converted the ERET, ERETAA, ERETAB
instructions to decodetree, the conversion accidentally lost the
correct setting of the syndrome register when taking a trap because
of the FEAT_FGT HFGITR_EL1.ERET bit.  Instead of reporting a correct
full syndrome value with the EC and IL bits, we only reported the low
two bits of the syndrome, because the call to syn_erettrap() got
dropped.

Fix the syndrome values for these traps by reinstating the
syn_erettrap() calls.

Fixes: 442c9d682c94fc2 ("target/arm: Convert ERET, ERETAA, ERETAB to decodetree")
Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20231024172438.2990945-1-peter.maydell@linaro.org

diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index ad78b8b120237aa3b1b103befe15235334e9200b..41484d8ae54bb8f8daabf2477910af3a0f7c482e 100644 (file)
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -1606,7 +1606,7 @@ static bool trans_ERET(DisasContext *s, arg_ERET *a)
         return false;
     }
     if (s->fgt_eret) {
-        gen_exception_insn_el(s, 0, EXCP_UDEF, 0, 2);
+        gen_exception_insn_el(s, 0, EXCP_UDEF, syn_erettrap(0), 2);
         return true;
     }
     dst = tcg_temp_new_i64();
@@ -1633,7 +1633,7 @@ static bool trans_ERETA(DisasContext *s, arg_reta *a)
     }
     /* The FGT trap takes precedence over an auth trap. */
     if (s->fgt_eret) {
-        gen_exception_insn_el(s, 0, EXCP_UDEF, a->m ? 3 : 2, 2);
+        gen_exception_insn_el(s, 0, EXCP_UDEF, syn_erettrap(a->m ? 3 : 2), 2);
         return true;
     }
     dst = tcg_temp_new_i64();