microblaze: Add partial decoding of stream insns

Based on a patch from: Alejandro Cabrera <aldaya@gmail.com>

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>

4 files changed, 78 insertions, 0 deletions

diff --git a/target-microblaze/helper.h b/target-microblaze/helper.h
index 1696b88..b92aa34 100644
--- a/target-microblaze/helper.h
+++ b/target-microblaze/helper.h
@@ -33,4 +33,7 @@ DEF_HELPER_2(mmu_write, void, i32, i32)
 
 DEF_HELPER_4(memalign, void, i32, i32, i32, i32)
 
+DEF_HELPER_2(get, i32, i32, i32)
+DEF_HELPER_3(put, void, i32, i32, i32)
+
 #include "def-helper.h"
diff --git a/target-microblaze/microblaze-decode.h b/target-microblaze/microblaze-decode.h
index 4a27476..401319e 100644
--- a/target-microblaze/microblaze-decode.h
+++ b/target-microblaze/microblaze-decode.h
@@ -50,3 +50,6 @@
 #define DEC_BR      {B8(00100110), B8(00110111)}
 #define DEC_BCC     {B8(00100111), B8(00110111)}
 #define DEC_RTS     {B8(00101101), B8(00111111)}
+
+#define DEC_STREAM  {B8(00010011), B8(00110111)}
+
diff --git a/target-microblaze/op_helper.c b/target-microblaze/op_helper.c
index d75a53c..39b8ec1 100644
--- a/target-microblaze/op_helper.c
+++ b/target-microblaze/op_helper.c
@@ -69,6 +69,41 @@ void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
 }
 #endif
 
+void helper_put(uint32_t id, uint32_t ctrl, uint32_t data)
+{
+    int test = ctrl & STREAM_TEST;
+    int atomic = ctrl & STREAM_ATOMIC;
+    int control = ctrl & STREAM_CONTROL;
+    int nonblock = ctrl & STREAM_NONBLOCK;
+    int exception = ctrl & STREAM_EXCEPTION;
+
+    qemu_log("Unhandled stream put to stream-id=%d data=%x %s%s%s%s%s\n",
+             id, data,
+             test ? "t" : "",
+             nonblock ? "n" : "",
+             exception ? "e" : "",
+             control ? "c" : "",
+             atomic ? "a" : "");
+}
+
+uint32_t helper_get(uint32_t id, uint32_t ctrl)
+{
+    int test = ctrl & STREAM_TEST;
+    int atomic = ctrl & STREAM_ATOMIC;
+    int control = ctrl & STREAM_CONTROL;
+    int nonblock = ctrl & STREAM_NONBLOCK;
+    int exception = ctrl & STREAM_EXCEPTION;
+
+    qemu_log("Unhandled stream get from stream-id=%d %s%s%s%s%s\n",
+             id,
+             test ? "t" : "",
+             nonblock ? "n" : "",
+             exception ? "e" : "",
+             control ? "c" : "",
+             atomic ? "a" : "");
+    return 0xdead0000 | id;
+}
+
 void helper_raise_exception(uint32_t index)
 {
     env->exception_index = index;
diff --git a/target-microblaze/translate.c b/target-microblaze/translate.c
index 6f4eef1..bff3a11 100644
--- a/target-microblaze/translate.c
+++ b/target-microblaze/translate.c
@@ -1476,6 +1476,42 @@ static void dec_null(DisasContext *dc)
     dc->abort_at_next_insn = 1;
 }
 
+/* Insns connected to FSL or AXI stream attached devices.  */
+static void dec_stream(DisasContext *dc)
+{
+    int mem_index = cpu_mmu_index(dc->env);
+    TCGv_i32 t_id, t_ctrl;
+    int ctrl;
+
+    LOG_DIS("%s%s imm=%x\n", dc->rd ? "get" : "put",
+            dc->type_b ? "" : "d", dc->imm);
+
+    if ((dc->tb_flags & MSR_EE_FLAG) && (mem_index == MMU_USER_IDX)) {
+        tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
+        t_gen_raise_exception(dc, EXCP_HW_EXCP);
+        return;
+    }
+
+    t_id = tcg_temp_new();
+    if (dc->type_b) {
+        tcg_gen_movi_tl(t_id, dc->imm & 0xf);
+        ctrl = dc->imm >> 10;
+    } else {
+        tcg_gen_andi_tl(t_id, cpu_R[dc->rb], 0xf);
+        ctrl = dc->imm >> 5;
+    }
+
+    t_ctrl = tcg_const_tl(ctrl);
+
+    if (dc->rd == 0) {
+        gen_helper_put(t_id, t_ctrl, cpu_R[dc->ra]);
+    } else {
+        gen_helper_get(cpu_R[dc->rd], t_id, t_ctrl);
+    }
+    tcg_temp_free(t_id);
+    tcg_temp_free(t_ctrl);
+}
+
 static struct decoder_info {
     struct {
         uint32_t bits;
@@ -1500,6 +1536,7 @@ static struct decoder_info {
     {DEC_MUL, dec_mul},
     {DEC_DIV, dec_div},
     {DEC_MSR, dec_msr},
+    {DEC_STREAM, dec_stream},
     {{0, 0}, dec_null}
 };