target/ppc: Implement hashst and hashchk

Implementation for instructions hashst and hashchk, which were added
in Power ISA 3.1B.

It was decided to implement the hash algorithm from ground up in this
patch exactly as described in Power ISA.

Signed-off-by: Víctor Colombo <victor.colombo@eldorado.org.br>
Reviewed-by: Lucas Mateus Castro <lucas.araujo@eldorado.org.br>
Message-Id: <20220715205439.161110-3-victor.colombo@eldorado.org.br>
[danielhb: fix block comment in excp_helper.c]
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/target/ppc/translate/fixedpoint-impl.c.inc b/target/ppc/translate/fixedpoint-impl.c.inc
index db14d3b..41c06de 100644
--- a/target/ppc/translate/fixedpoint-impl.c.inc
+++ b/target/ppc/translate/fixedpoint-impl.c.inc
@@ -540,3 +540,35 @@ static bool trans_CBCDTD(DisasContext *ctx, arg_X_sa *a)
     gen_helper_CBCDTD(cpu_gpr[a->ra], cpu_gpr[a->rs]);
     return true;
 }
+
+static bool do_hash(DisasContext *ctx, arg_X *a, bool priv,
+    void (*helper)(TCGv_ptr, TCGv, TCGv, TCGv))
+{
+    TCGv ea;
+
+    if (!(ctx->insns_flags2 & PPC2_ISA310)) {
+        /* if version is before v3.1, this operation is a nop */
+        return true;
+    }
+
+    if (priv) {
+        /* if instruction is privileged but the context is in user space */
+        REQUIRE_SV(ctx);
+    }
+
+    if (unlikely(a->ra == 0)) {
+        /* if RA=0, the instruction form is invalid */
+        gen_invalid(ctx);
+        return true;
+    }
+
+    ea = do_ea_calc(ctx, a->ra, tcg_constant_tl(a->rt));
+    helper(cpu_env, ea, cpu_gpr[a->ra], cpu_gpr[a->rb]);
+
+    tcg_temp_free(ea);
+
+    return true;
+}
+
+TRANS(HASHST, do_hash, false, gen_helper_HASHST)
+TRANS(HASHCHK, do_hash, false, gen_helper_HASHCHK)