[Qemu-devel] [PATCH v9 05/14] target-mips-ase-dsp: Add load instructions

[Jia Liu <proljc@gmail.com>]

Add MIPS ASE DSP Load instructions.

Signed-off-by: Jia Liu <proljc@gmail.com>
---
 target-mips/translate.c |   84 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)

diff --git a/target-mips/translate.c b/target-mips/translate.c
index 4103f24..6d5c475 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -313,6 +313,9 @@ enum {
     OPC_MODU_G_2E   = 0x23 | OPC_SPECIAL3,
     OPC_DMOD_G_2E   = 0x26 | OPC_SPECIAL3,
     OPC_DMODU_G_2E  = 0x27 | OPC_SPECIAL3,
+
+    /* MIPS DSP Load */
+    OPC_LX_DSP         = 0x0A | OPC_SPECIAL3,
 };
 
 /* BSHFL opcodes */
@@ -340,6 +343,17 @@ enum {
 #endif
 };
 
+#define MASK_LX(op) (MASK_SPECIAL3(op) | (op & (0x1F << 6)))
+/* MIPS DSP Load */
+enum {
+    OPC_LBUX = (0x06 << 6) | OPC_LX_DSP,
+    OPC_LHX  = (0x04 << 6) | OPC_LX_DSP,
+    OPC_LWX  = (0x00 << 6) | OPC_LX_DSP,
+#if defined(TARGET_MIPS64)
+    OPC_LDX = (0x08 << 6) | OPC_LX_DSP,
+#endif
+};
+
 /* Coprocessor 0 (rs field) */
 #define MASK_CP0(op)       MASK_OP_MAJOR(op) | (op & (0x1F << 21))
 
@@ -12213,6 +12227,58 @@ static int decode_micromips_opc (CPUMIPSState *env, DisasContext *ctx, int *is_b
 
 #endif
 
+/* MIPSDSP functions. */
+static void gen_mipsdsp_ld(CPUMIPSState *env, DisasContext *ctx, uint32_t opc,
+                           int rd, int base, int offset)
+{
+    const char *opn = "ldx";
+    TCGv t0;
+
+    if (rd == 0 && env->insn_flags & (ASE_DSP | ASE_DSPR2)) {
+        /* Loongson CPU uses a load to zero register for prefetch.
+           We emulate it as a NOP. On other CPU we must perform the
+           actual memory access. */
+        MIPS_DEBUG("NOP");
+        return;
+    }
+
+    t0 = tcg_temp_new();
+    gen_op_addr_add(ctx, t0, cpu_gpr[base], cpu_gpr[offset]);
+    save_cpu_state(ctx, 0);
+
+    switch (opc) {
+    case OPC_LBUX:
+        op_ld_lbu(t0, t0, ctx);
+        gen_store_gpr(t0, rd);
+        opn = "lbux";
+        break;
+    case OPC_LHX:
+        op_ld_lh(t0, t0, ctx);
+        gen_store_gpr(t0, rd);
+        opn = "lhx";
+        break;
+    case OPC_LWX:
+        op_ld_lw(t0, t0, ctx);
+        gen_store_gpr(t0, rd);
+        opn = "lwx";
+        break;
+#if defined(TARGET_MIPS64)
+    case OPC_LDX:
+        op_ld_ld(t0, t0, ctx);
+        gen_store_gpr(t0, rd);
+        opn = "ldx";
+        break;
+#endif
+    }
+    (void)opn; /* avoid a compiler warning */
+    MIPS_DEBUG("%s %s, %s(%s)", opn,
+               regnames[rd], regnames[offset], regnames[base]);
+    tcg_temp_free(t0);
+}
+
+
+/* End MIPSDSP functions. */
+
 static void decode_opc (CPUMIPSState *env, DisasContext *ctx, int *is_branch)
 {
     int32_t offset;
@@ -12568,6 +12634,24 @@ static void decode_opc (CPUMIPSState *env, DisasContext *ctx, int *is_branch)
             check_insn(env, ctx, INSN_LOONGSON2E);
             gen_loongson_integer(ctx, op1, rd, rs, rt);
             break;
+        case OPC_LX_DSP:
+            check_dsp(ctx);
+            op2 = MASK_LX(ctx->opcode);
+            switch (op2) {
+#if defined(TARGET_MIPS64)
+            case OPC_LDX:
+#endif
+            case OPC_LBUX:
+            case OPC_LHX:
+            case OPC_LWX:
+                gen_mipsdsp_ld(env, ctx, op2, rd, rs, rt);
+                break;
+            default:            /* Invalid */
+                MIPS_INVAL("MASK LX");
+                generate_exception(ctx, EXCP_RI);
+                break;
+            }
+            break;
 #if defined(TARGET_MIPS64)
         case OPC_DEXTM ... OPC_DEXT:
         case OPC_DINSM ... OPC_DINS:
-- 
1.7.10.2 (Apple Git-33)