[ARM64] Initial commit for arm64 backend

Based entirely off existing xbyak x86 implementation and available tests. Still needs a lot of optimization and testing on non-Windows platforms. So far passes all tests and boots at least some games on Windows.
2026-03-21 01:17:18 +09:00
parent c6e112bcd8
commit 883c2030d0
44 changed files with 13428 additions and 140 deletions
--- a/src/xenia/cpu/backend/a64/a64_stack_layout.h
+++ b/src/xenia/cpu/backend/a64/a64_stack_layout.h
@@ -0,0 +1,85 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2026 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_CPU_BACKEND_A64_A64_STACK_LAYOUT_H_
+#define XENIA_CPU_BACKEND_A64_A64_STACK_LAYOUT_H_
+
+#include "xenia/base/vec128.h"
+
+namespace xe {
+namespace cpu {
+namespace backend {
+namespace a64 {
+
+class StackLayout {
+ public:
+  /**
+   * ARM64 Thunk Stack Layout
+   * NOTE: stack must always be 16-byte aligned.
+   *
+   * Thunk (HostToGuest/GuestToHost):
+   *  +------------------+
+   *  | x19              | sp + 0x000
+   *  | x20 (context)    | sp + 0x008
+   *  | x21 (membase)    | sp + 0x010
+   *  | x22              | sp + 0x018
+   *  | x23              | sp + 0x020
+   *  | x24              | sp + 0x028
+   *  | x25              | sp + 0x030
+   *  | x26              | sp + 0x038
+   *  | x27              | sp + 0x040
+   *  | x28              | sp + 0x048
+   *  | x29 (fp)         | sp + 0x050
+   *  | x30 (lr)         | sp + 0x058
+   *  | d8               | sp + 0x060
+   *  | d9               | sp + 0x068
+   *  | d10              | sp + 0x070
+   *  | d11              | sp + 0x078
+   *  | d12              | sp + 0x080
+   *  | d13              | sp + 0x088
+   *  | d14              | sp + 0x090
+   *  | d15              | sp + 0x098
+   *  +------------------+
+   *  Total: 0xA0 = 160 bytes (already 16-byte aligned)
+   */
+  static constexpr size_t THUNK_STACK_SIZE = 160;
+
+  /**
+   * ARM64 Guest Stack Layout
+   *  +------------------+
+   *  | scratch, 48b     | sp + 0x000  (3 x Q for VMX FP scratch)
+   *  | guest ret addr   | sp + 0x030  (guest PPC return address)
+   *  | call ret addr    | sp + 0x038  (next call's guest PPC return addr)
+   *  | host ret addr    | sp + 0x040  (host x30/LR, for ret instruction)
+   *  | guest saved r1   | sp + 0x048  (guest r1 at function entry, for
+   *  |                  |              longjmp detection)
+   *  |  ... locals ...  |
+   *  +------------------+
+   *
+   * Minimum size: 80 bytes (aligned to 16).
+   *
+   * Convention: at guest function entry, x0 holds the guest PPC return
+   * address. The prolog stores it to GUEST_RET_ADDR and saves x30 (host
+   * LR) to HOST_RET_ADDR.
+   */
+  static constexpr size_t GUEST_STACK_SIZE = 80;  // 16-byte aligned
+  static constexpr size_t GUEST_SCRATCH = 0;      // 48 bytes (3 x Q)
+  static constexpr size_t GUEST_RET_ADDR = 48;
+  static constexpr size_t GUEST_CALL_RET_ADDR = 56;
+  static constexpr size_t HOST_RET_ADDR = 64;
+  // Stackpoint depth after PushStackpoint in prolog, for longjmp detection.
+  static constexpr size_t GUEST_SAVED_STACKPOINT_DEPTH = 72;
+};
+
+}  // namespace a64
+}  // namespace backend
+}  // namespace cpu
+}  // namespace xe
+
+#endif  // XENIA_CPU_BACKEND_A64_A64_STACK_LAYOUT_H_