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target/arm: Fix syndrome for FGT traps on ERET 

In commit 442c9d682c 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: 442c9d682c ("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
master
Peter Maydell 2023-10-24 18:24:38 +01:00
parent 1036ce4e6a
commit 307521d6e2
1 changed files with 2 additions and 2 deletions
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4
target/arm/tcg/translate-a64.c
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@ -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();