[Qemu-devel] [PATCH 51/60] AArch64: Add fmov (scalar, immediate) instruction

[Alexander Graf]

This patch adds emulation for the fmov instruction working on scalars
with an immediate payload.

Signed-off-by: Alexander Graf <address@hidden>
---
 target-arm/translate-a64.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 654e011..33163fd 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -1884,6 +1884,39 @@ static void handle_fpfpconv(DisasContext *s, uint32_t 
insn)
     handle_fpfpcvt(s, insn, direction, ROUND_MODE_ZERO);
 }
 
+/* fmov (immediate) */
+static void handle_fmovi(DisasContext *s, uint32_t insn)
+{
+    int rd = get_reg(insn);
+    int imm8 = get_bits(insn, 13, 8);
+    int is_double = get_bits(insn, 22, 2);
+    uint64_t imm;
+    int freg_offs_d = offsetof(CPUARMState, vfp.regs[rd * 2]);
+    TCGv_i64 tcg_res;
+
+    if (is_double > 1) {
+        unallocated_encoding(s);
+        return;
+    }
+
+    if (is_double) {
+        imm = (get_bits(imm8, 7, 1) ? 0x8000 : 0) |
+              (get_bits(imm8, 6, 1) ? 0x3fc0 : 0x4000) |
+              get_bits(imm8, 0, 6);
+        imm <<= 48;
+    } else {
+        imm = (get_bits(imm8, 7, 1) ? 0x8000 : 0) |
+              (get_bits(imm8, 6, 1) ? 0x3e00 : 0x4000) |
+              (get_bits(imm8, 0, 6) << 3);
+        imm <<= 16;
+    }
+
+    tcg_res = tcg_const_i64(imm);
+    clear_fpreg(rd);
+    tcg_gen_st_i64(tcg_res, cpu_env, freg_offs_d);
+    tcg_temp_free_i64(tcg_res);
+}
+
 /* SIMD ORR */
 static void handle_simdorr(DisasContext *s, uint32_t insn)
 {
@@ -2466,6 +2499,9 @@ void disas_a64_insn(CPUARMState *env, DisasContext *s)
     case 0x1e:
         if (!get_bits(insn, 21, 1) && !get_bits(insn, 30, 1)) {
             handle_fpfpconv(s, insn);
+        } else if (!get_bits(insn, 29, 3) && get_bits(insn, 21, 1) &&
+                   (get_bits(insn, 5, 8) == 0x80)) {
+            handle_fmovi(s, insn);
         } else {
             unallocated_encoding(s);
         }
-- 
1.7.12.4