From 9371557115a734412974f8d4096cbe8a62ca2731 Mon Sep 17 00:00:00 2001
From: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Date: Mon, 11 May 2015 14:59:55 +0200
Subject: [PATCH] target-tricore: add RR_DIV and RR_DIV_U instructions of the
 v1.6 ISA

Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Reviewed-by: Richard Henderson <rth@twiddle.net>
---
 target-tricore/helper.h          |  2 ++
 target-tricore/op_helper.c       | 49 ++++++++++++++++++++++++++++++++
 target-tricore/translate.c       | 21 ++++++++++++++
 target-tricore/tricore-opcodes.h |  2 ++
 4 files changed, 74 insertions(+)

diff --git a/target-tricore/helper.h b/target-tricore/helper.h
index 842506c5f9..cc221f1a9b 100644
--- a/target-tricore/helper.h
+++ b/target-tricore/helper.h
@@ -113,6 +113,8 @@ DEF_HELPER_3(dvinit_h_131, i64, env, i32, i32)
 DEF_HELPER_FLAGS_2(dvadj, TCG_CALL_NO_RWG_SE, i64, i64, i32)
 DEF_HELPER_FLAGS_2(dvstep, TCG_CALL_NO_RWG_SE, i64, i64, i32)
 DEF_HELPER_FLAGS_2(dvstep_u, TCG_CALL_NO_RWG_SE, i64, i64, i32)
+DEF_HELPER_3(divide, i64, env, i32, i32)
+DEF_HELPER_3(divide_u, i64, env, i32, i32)
 /* mulh */
 DEF_HELPER_FLAGS_5(mul_h, TCG_CALL_NO_RWG_SE, i64, i32, i32, i32, i32, i32)
 DEF_HELPER_FLAGS_5(mulm_h, TCG_CALL_NO_RWG_SE, i64, i32, i32, i32, i32, i32)
diff --git a/target-tricore/op_helper.c b/target-tricore/op_helper.c
index 7aa1f8e40e..10ed541dfd 100644
--- a/target-tricore/op_helper.c
+++ b/target-tricore/op_helper.c
@@ -2094,6 +2094,55 @@ uint64_t helper_dvstep_u(uint64_t r1, uint32_t r2)
     return ((uint64_t)remainder << 32) | (uint32_t)dividend_quotient;
 }
 
+uint64_t helper_divide(CPUTriCoreState *env, uint32_t r1, uint32_t r2)
+{
+    int32_t quotient, remainder;
+    int32_t dividend = (int32_t)r1;
+    int32_t divisor = (int32_t)r2;
+
+    if (divisor == 0) {
+        if (dividend >= 0) {
+            quotient = 0x7fffffff;
+            remainder = 0;
+        } else {
+            quotient = 0x80000000;
+            remainder = 0;
+        }
+        env->PSW_USB_V = (1 << 31);
+    } else if ((divisor == 0xffffffff) && (dividend == 0x80000000)) {
+        quotient = 0x7fffffff;
+        remainder = 0;
+        env->PSW_USB_V = (1 << 31);
+    } else {
+        remainder = dividend % divisor;
+        quotient = (dividend - remainder)/divisor;
+        env->PSW_USB_V = 0;
+    }
+    env->PSW_USB_SV |= env->PSW_USB_V;
+    env->PSW_USB_AV = 0;
+    return ((uint64_t)remainder << 32) | (uint32_t)quotient;
+}
+
+uint64_t helper_divide_u(CPUTriCoreState *env, uint32_t r1, uint32_t r2)
+{
+    uint32_t quotient, remainder;
+    uint32_t dividend = r1;
+    uint32_t divisor = r2;
+
+    if (divisor == 0) {
+        quotient = 0xffffffff;
+        remainder = 0;
+        env->PSW_USB_V = (1 << 31);
+    } else {
+        remainder = dividend % divisor;
+        quotient = (dividend - remainder)/divisor;
+        env->PSW_USB_V = 0;
+    }
+    env->PSW_USB_SV |= env->PSW_USB_V;
+    env->PSW_USB_AV = 0;
+    return ((uint64_t)remainder << 32) | quotient;
+}
+
 uint64_t helper_mul_h(uint32_t arg00, uint32_t arg01,
                       uint32_t arg10, uint32_t arg11, uint32_t n)
 {
diff --git a/target-tricore/translate.c b/target-tricore/translate.c
index d4e4226f69..5f8eff04fa 100644
--- a/target-tricore/translate.c
+++ b/target-tricore/translate.c
@@ -201,6 +201,15 @@ void tricore_cpu_dump_state(CPUState *cs, FILE *f,
     tcg_temp_free_i64(arg1);                                 \
 } while (0)
 
+#define GEN_HELPER_RR(name, rl, rh, arg1, arg2) do {        \
+    TCGv_i64 ret = tcg_temp_new_i64();                      \
+                                                            \
+    gen_helper_##name(ret, cpu_env, arg1, arg2);            \
+    tcg_gen_extr_i64_i32(rl, rh, ret);                      \
+                                                            \
+    tcg_temp_free_i64(ret);                                 \
+} while (0)
+
 #define EA_ABS_FORMAT(con) (((con & 0x3C000) << 14) + (con & 0x3FFF))
 #define EA_B_ABSOLUT(con) (((offset & 0xf00000) << 8) | \
                            ((offset & 0x0fffff) << 1))
@@ -6494,6 +6503,18 @@ static void decode_rr_divide(CPUTriCoreState *env, DisasContext *ctx)
             gen_helper_crc32(cpu_gpr_d[r3], cpu_gpr_d[r1], cpu_gpr_d[r2]);
         } /* TODO: else raise illegal opcode trap */
         break;
+    case OPC2_32_RR_DIV:
+        if (tricore_feature(env, TRICORE_FEATURE_16)) {
+            GEN_HELPER_RR(divide, cpu_gpr_d[r3], cpu_gpr_d[r3+1], cpu_gpr_d[r1],
+                          cpu_gpr_d[r2]);
+        } /* TODO: else raise illegal opcode trap */
+        break;
+    case OPC2_32_RR_DIV_U:
+        if (tricore_feature(env, TRICORE_FEATURE_16)) {
+            GEN_HELPER_RR(divide_u, cpu_gpr_d[r3], cpu_gpr_d[r3+1],
+                          cpu_gpr_d[r1], cpu_gpr_d[r2]);
+        } /* TODO: else raise illegal opcode trap */
+        break;
     }
 }
 
diff --git a/target-tricore/tricore-opcodes.h b/target-tricore/tricore-opcodes.h
index 22c79f570f..1bfed0ce48 100644
--- a/target-tricore/tricore-opcodes.h
+++ b/target-tricore/tricore-opcodes.h
@@ -1124,6 +1124,8 @@ enum {
     OPC2_32_RR_PARITY                            = 0x02,
     OPC2_32_RR_UNPACK                            = 0x08,
     OPC2_32_RR_CRC32                             = 0x03,
+    OPC2_32_RR_DIV                               = 0x20,
+    OPC2_32_RR_DIV_U                             = 0x21,
 };
 /* OPCM_32_RR_IDIRECT                               */
 enum {