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target/arm: Make RETA[AB] UNDEF when pauth is not implemented

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According to the Arm A-profile A64 Instruction Set Architecture,
RETA[AB] should be decoded as UNDEF if the pauth feature is not
implemented.

We got this right in the initial implementation, but accidentally
dropped the feature-check when we converted these insns to
decodetree.

Cc: qemu-stable@nongnu.org
Fixes: 0ebbe90212 ("target/arm: Convert BRA[AB]Z, BLR[AB]Z, RETA[AB] to decodetree")
Signed-off-by: Solomon Tan <root@wjsota.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250616171549.59190-1-root@wjsota.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Solomon Tan
2025-07-01 15:08:25 +01:00
committed by Peter Maydell
parent a89d18919e
commit 9a3bf0e0ab
1 changed files with 4 additions and 0 deletions
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target/arm/tcg/translate-a64.c
+4
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@@ -1816,6 +1816,10 @@ static bool trans_RETA(DisasContext *s, arg_reta *a)
{
TCGv_i64 dst;
if (!dc_isar_feature(aa64_pauth, s)) {
return false;
}
dst = auth_branch_target(s, cpu_reg(s, 30), cpu_X[31], !a->m);
gen_a64_set_pc(s, dst);
s->base.is_jmp = DISAS_JUMP;