[RFC PATCH 16/39] target/riscv: Add vaesdm.vv decoding, translation and execution support

[Lawrence Hunter]

Signed-off-by: Lawrence Hunter <lawrence.hunter@codethink.co.uk>
---
 target/riscv/helper.h                       |  1 +
 target/riscv/insn32.decode                  |  1 +
 target/riscv/insn_trans/trans_rvzvkns.c.inc |  1 +
 target/riscv/vcrypto_helper.c               | 36 +++++++++++++++++++++
 4 files changed, 39 insertions(+)

diff --git a/target/riscv/helper.h b/target/riscv/helper.h
index 020b9861cf..328a026039 100644
--- a/target/riscv/helper.h
+++ b/target/riscv/helper.h
@@ -1185,3 +1185,4 @@ 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)
 DEF_HELPER_4(vaesdf_vs, void, ptr, ptr, env, i32)
+DEF_HELPER_4(vaesdm_vv, void, ptr, ptr, env, i32)
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index 33e5883937..e5f3af999d 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -914,3 +914,4 @@ 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
 vaesdf_vs       101001 1 ..... 00001 010 ..... 1110111 @r2_vm_1
+vaesdm_vv       101000 1 ..... 00000 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 7dd61b879e..21ef836fb2 100644
--- a/target/riscv/insn_trans/trans_rvzvkns.c.inc
+++ b/target/riscv/insn_trans/trans_rvzvkns.c.inc
@@ -60,3 +60,4 @@ 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)
 GEN_V_UNMASKED_TRANS(vaesdf_vs, vaes_check_vs)
+GEN_V_UNMASKED_TRANS(vaesdm_vv, vaes_check_vv)
diff --git a/target/riscv/vcrypto_helper.c b/target/riscv/vcrypto_helper.c
index d3ba5e9cb8..bac21b5623 100644
--- a/target/riscv/vcrypto_helper.c
+++ b/target/riscv/vcrypto_helper.c
@@ -219,6 +219,38 @@ static inline void aes_inv_shift_bytes(uint8_t 
round_state[4][4])
     round_state[3][3] = temp;
 }
 
+static inline uint8_t xtime(uint8_t x)
+{
+    return (x << 1) ^ (((x >> 7) & 1) * 0x1b);
+}
+
+static inline uint8_t multiply(uint8_t x, uint8_t y)
+{
+    return (((y & 1) * x) ^ ((y >> 1 & 1) * xtime(x)) ^
+            ((y >> 2 & 1) * xtime(xtime(x))) ^
+            ((y >> 3 & 1) * xtime(xtime(xtime(x)))) ^
+            ((y >> 4 & 1) * xtime(xtime(xtime(xtime(x))))));
+}
+
+static inline void aes_inv_mix_cols(uint8_t round_state[4][4])
+{
+    uint8_t a, b, c, d;
+    for (int j = 0; j < 4; ++j) {
+        a = round_state[j][0];
+        b = round_state[j][1];
+        c = round_state[j][2];
+        d = round_state[j][3];
+        round_state[j][0] = multiply(a, 0x0e) ^ multiply(b, 0x0b) ^
+                            multiply(c, 0x0d) ^ multiply(d, 0x09);
+        round_state[j][1] = multiply(a, 0x09) ^ multiply(b, 0x0e) ^
+                            multiply(c, 0x0b) ^ multiply(d, 0x0d);
+        round_state[j][2] = multiply(a, 0x0d) ^ multiply(b, 0x09) ^
+                            multiply(c, 0x0e) ^ multiply(d, 0x0b);
+        round_state[j][3] = multiply(a, 0x0b) ^ multiply(b, 0x0d) ^
+                            multiply(c, 0x09) ^ multiply(d, 0x0e);
+    }
+}
+
 #define GEN_ZVKNS_HELPER_VV(NAME, ...)                                    \
 void HELPER(NAME)(void *vd_vptr, void *vs2_vptr, CPURISCVState *env,      \
                   uint32_t desc)                                          \
@@ -301,3 +333,7 @@ GEN_ZVKNS_HELPER_VV(vaesdf_vv, 
aes_inv_shift_bytes(round_state);
 GEN_ZVKNS_HELPER_VS(vaesdf_vs, aes_inv_shift_bytes(round_state);
                     aes_inv_sub_bytes(round_state);
                     xor_round_key(round_state, (uint8_t *)round_key);)
+GEN_ZVKNS_HELPER_VV(vaesdm_vv, aes_inv_shift_bytes(round_state);
+                    aes_inv_sub_bytes(round_state);
+                    xor_round_key(round_state, (uint8_t *)round_key);
+                    aes_inv_mix_cols(round_state);)
-- 
2.39.1