[PATCH 14/39] target/riscv: Add vaesdf.vv decoding, translation and execution support

[Lawrence Hunter <lawrence.hunter@xxxxxxxxxxxxxxx>]

Signed-off-by: Lawrence Hunter <lawrence.hunter@xxxxxxxxxxxxxxx>
---
 target/riscv/helper.h                       |  1 +
 target/riscv/insn32.decode                  |  1 +
 target/riscv/insn_trans/trans_rvzvkns.c.inc |  1 +
 target/riscv/vcrypto_helper.c               | 31 +++++++++++++++++++++
 4 files changed, 34 insertions(+)

diff --git a/target/riscv/helper.h b/target/riscv/helper.h
index 42349837ef..b7696cb6c4 100644
--- a/target/riscv/helper.h
+++ b/target/riscv/helper.h
@@ -1183,3 +1183,4 @@ DEF_HELPER_6(vandn_vx_d, void, ptr, ptr, tl, ptr, env, i32)
 
 DEF_HELPER_4(vaesef_vv, void, ptr, ptr, env, i32)
 DEF_HELPER_4(vaesef_vs, void, ptr, ptr, env, i32)
+DEF_HELPER_4(vaesdf_vv, void, ptr, ptr, env, i32)
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index 0d65c2ea27..ca907dac85 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -912,3 +912,4 @@ vandn_vx        000001 . ..... ..... 100 ..... 1010111 @r_vm
 # *** RV64 Zvkns vector crypto extension ***
 vaesef_vv       101000 1 ..... 00011 010 ..... 1110111 @r2_vm_1
 vaesef_vs       101001 1 ..... 00011 010 ..... 1110111 @r2_vm_1
+vaesdf_vv       101000 1 ..... 00001 010 ..... 1110111 @r2_vm_1
diff --git a/target/riscv/insn_trans/trans_rvzvkns.c.inc b/target/riscv/insn_trans/trans_rvzvkns.c.inc
index 2317af02a9..2e09deeb84 100644
--- a/target/riscv/insn_trans/trans_rvzvkns.c.inc
+++ b/target/riscv/insn_trans/trans_rvzvkns.c.inc
@@ -54,3 +54,4 @@ static bool vaes_check_vs(DisasContext *s, arg_rmr *a)
 
 GEN_V_UNMASKED_TRANS(vaesef_vv, vaes_check_vv)
 GEN_V_UNMASKED_TRANS(vaesef_vs, vaes_check_vs)
+GEN_V_UNMASKED_TRANS(vaesdf_vv, vaes_check_vv)
diff --git a/target/riscv/vcrypto_helper.c b/target/riscv/vcrypto_helper.c
index f59e090c03..24b5336fa7 100644
--- a/target/riscv/vcrypto_helper.c
+++ b/target/riscv/vcrypto_helper.c
@@ -191,6 +191,34 @@ static inline void xor_round_key(uint8_t round_state[4][4], uint8_t *round_key)
     }
 }
 
+static inline void aes_inv_sub_bytes(uint8_t round_state[4][4])
+{
+    for (int j = 0; j < 16; j++) {
+        round_state[j / 4][j % 4] = AES_isbox[round_state[j / 4][j % 4]];
+    }
+}
+
+static inline void aes_inv_shift_bytes(uint8_t round_state[4][4])
+{
+    uint8_t temp;
+    temp = round_state[3][1];
+    round_state[3][1] = round_state[2][1];
+    round_state[2][1] = round_state[1][1];
+    round_state[1][1] = round_state[0][1];
+    round_state[0][1] = temp;
+    temp = round_state[0][2];
+    round_state[0][2] = round_state[2][2];
+    round_state[2][2] = temp;
+    temp = round_state[1][2];
+    round_state[1][2] = round_state[3][2];
+    round_state[3][2] = temp;
+    temp = round_state[0][3];
+    round_state[0][3] = round_state[1][3];
+    round_state[1][3] = round_state[2][3];
+    round_state[2][3] = round_state[3][3];
+    round_state[3][3] = temp;
+}
+
 #define GEN_ZVKNS_HELPER_VV(NAME, ...)                                    \
 void HELPER(NAME)(void *vd_vptr, void *vs2_vptr, CPURISCVState *env,      \
                   uint32_t desc)                                          \
@@ -267,3 +295,6 @@ GEN_ZVKNS_HELPER_VV(vaesef_vv, aes_sub_bytes(round_state);
 GEN_ZVKNS_HELPER_VS(vaesef_vs, aes_sub_bytes(round_state);
                     aes_shift_bytes(round_state);
                     xor_round_key(round_state, (uint8_t *)round_key);)
+GEN_ZVKNS_HELPER_VV(vaesdf_vv, aes_inv_shift_bytes(round_state);
+                    aes_inv_sub_bytes(round_state);
+                    xor_round_key(round_state, (uint8_t *)round_key);)
-- 
2.39.1