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1 files changed, 53 insertions, 0 deletions

diff --git a/lib/arm64/assemble.h b/lib/arm64/assemble.h
new file mode 100644
index 0000000..00797e9
--- /dev/null
+++ b/lib/arm64/assemble.h
@@ -0,0 +1,53 @@
+#pragma once
+#include "dis.h"
+static inline void MOVi64(void **codep, int Rd, uint64_t val) {
+    int shift_nybbles = 0;
+    do {
+        int k = shift_nybbles != 0 ? 1 : 0;
+        op32(codep, 0x69400000 | k << 28 | Rd | (val & 0xffff) << 4 |
+                    shift_nybbles << 20);
+        shift_nybbles++;
+        val >>= 16;
+    } while(val);
+}
+
+static inline void LDRxi(void **codep, int Rt, int Rn, uint32_t off,
+                         bool regsize_64, enum pcrel_load_mode load_mode) {
+    int size, opc;
+    bool sign, simd;
+    switch (load_mode) {
+        case PLM_U8:  size = 0; sign = false;  simd = false; break;
+        case PLM_S8:  size = 0; sign = true;   simd = false; break;
+        case PLM_U16: size = 1; sign = false;  simd = false; break;
+        case PLM_S16: size = 1; sign = true;   simd = false; break;
+        case PLM_U32: size = 2; sign = false;  simd = false; break;
+        case PLM_S32: size = 2; sign = true;   simd = false; break;
+        case PLM_U64: size = 3; sign = false;  simd = false; break;
+        case PLM_U32_SIMD:  size = 2; opc = 1; simd = true; break;
+        case PLM_U64_SIMD:  size = 3; opc = 1; simd = true; break;
+        case PLM_U128_SIMD: size = 0; opc = 3; simd = true; break;
+        default: __builtin_abort();
+    }
+    if (simd) {
+        off /= 1 << (size | (opc & 1) << 2);
+    } else {
+        off /= 1 << size;
+        opc = sign ? (regsize_64 ? 2 : 3) : 1;
+    }
+    op32(codep, 0x39000000 | Rt | Rn << 5 | off << 10 | opc << 22 | simd << 26 |
+                size << 30);
+}
+
+static inline void ADRP_ADD(void **codep, int reg, uint64_t pc, uint64_t dpc) {
+    uintptr_t diff = (dpc & ~0xfff) - (pc & ~0xfff);
+    /* ADRP reg, dpc */
+    op32(codep, 0x90000000 | reg | (diff & 0x3000) << 17 | (diff & 0xffffc000) >> 8);
+    uint32_t lo = pc & 0xfff;
+    if (lo) {
+        /* ADD reg, reg, #lo */
+        op32(codep, 0x91000000 | reg | reg << 5 | lo << 10);
+    }
+    /* BR reg */
+    op32(codep, 0xd61f0000 | reg << 5);
+}
+