[Qemu-devel] [PATCH v2 07/33] target/mips: Add emulation of nanoMIPS 48-bit instructions

[Aleksandar Markovic]

From: Yongbok Kim <address@hidden>

Add emulation of LI48, ADDIU48, ADDIUGP48, ADDIUPC48, LWPC48, and
SWPC48 instructions.

Signed-off-by: Yongbok Kim <address@hidden>
Signed-off-by: Aleksandar Markovic <address@hidden>
Signed-off-by: Stefan Markovic <address@hidden>
---
 target/mips/translate.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/target/mips/translate.c b/target/mips/translate.c
index 09bb9b2..ae46de2 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -16541,6 +16541,72 @@ static int decode_nanomips_32_48_opc(CPUMIPSState 
*env, DisasContext *ctx)
         }
         break;
     case NM_P48I:
+        insn = cpu_lduw_code(env, ctx->base.pc_next + 4);
+        switch ((ctx->opcode >> 16) & 0x1f) {
+        case NM_LI48:
+            if (rt != 0) {
+                tcg_gen_movi_tl(cpu_gpr[rt],
+                                extract32(ctx->opcode, 0, 16) | insn << 16);
+            }
+            break;
+        case NM_ADDIU48:
+            if (rt != 0) {
+                tcg_gen_addi_tl(cpu_gpr[rt], cpu_gpr[rt],
+                                extract32(ctx->opcode, 0, 16) | insn << 16);
+                tcg_gen_ext32s_tl(cpu_gpr[rt], cpu_gpr[rt]);
+            }
+            break;
+        case NM_ADDIUGP48:
+            if (rt != 0) {
+                tcg_gen_addi_tl(cpu_gpr[rt], cpu_gpr[28],
+                                extract32(ctx->opcode, 0, 16) | insn << 16);
+                tcg_gen_ext32s_tl(cpu_gpr[rt], cpu_gpr[rt]);
+            }
+            break;
+        case NM_ADDIUPC48:
+            if (rt != 0) {
+                int32_t offset = extract32(ctx->opcode, 0, 16) | insn << 16;
+                target_long addr = addr_add(ctx, ctx->base.pc_next + 6, 
offset);
+
+                tcg_gen_movi_tl(cpu_gpr[rt], addr);
+                tcg_gen_ext32s_tl(cpu_gpr[rt], cpu_gpr[rt]);
+            }
+            break;
+        case NM_LWPC48:
+            if (rt != 0) {
+                TCGv t0;
+                t0 = tcg_temp_new();
+
+                int32_t offset = extract32(ctx->opcode, 0, 16) | insn << 16;
+                target_long addr = addr_add(ctx, ctx->base.pc_next + 6, 
offset);
+
+                tcg_gen_movi_tl(t0, addr);
+                tcg_gen_qemu_ld_tl(cpu_gpr[rt], t0, ctx->mem_idx, MO_TESL);
+                tcg_temp_free(t0);
+            }
+            break;
+        case NM_SWPC48:
+        {
+            TCGv t0, t1;
+            t0 = tcg_temp_new();
+            t1 = tcg_temp_new();
+
+            int32_t offset = extract32(ctx->opcode, 0, 16) | insn << 16;
+            target_long addr = addr_add(ctx, ctx->base.pc_next + 6, offset);
+
+            tcg_gen_movi_tl(t0, addr);
+            gen_load_gpr(t1, rt);
+
+            tcg_gen_qemu_st_tl(t1, t0, ctx->mem_idx, MO_TEUL);
+
+            tcg_temp_free(t0);
+            tcg_temp_free(t1);
+        }
+            break;
+        default:
+            generate_exception_end(ctx, EXCP_RI);
+            break;
+        }
         return 6;
     case NM_P_U12:
         switch ((ctx->opcode >> 12) & 0x0f) {
-- 
2.7.4