1 files changed, 62 insertions, 0 deletions
diff --git a/deps/v8/src/heap/base/asm/arm64/push_registers_asm.cc b/deps/v8/src/heap/base/asm/arm64/push_registers_asm.cc
new file mode 100644
index 0000000000..1efcc3430b
--- /dev/null
+++ b/deps/v8/src/heap/base/asm/arm64/push_registers_asm.cc
@@ -0,0 +1,62 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Push all callee-saved registers to get them on the stack for conservative
+// stack scanning.
+//
+// See asm/x64/push_registers_clang.cc for why the function is not generated
+// using clang.
+//
+// Do not depend on V8_TARGET_OS_* defines as some embedders may override the
+// GN toolchain (e.g. ChromeOS) and not provide them.
+
+// We maintain 16-byte alignment.
+//
+// Calling convention source:
+// https://en.wikipedia.org/wiki/Calling_convention#ARM_(A64)
+
+asm(
+#if defined(__APPLE__)
+    ".globl _PushAllRegistersAndIterateStack            \n"
+    ".private_extern _PushAllRegistersAndIterateStack   \n"
+    ".p2align 2                                         \n"
+    "_PushAllRegistersAndIterateStack:                  \n"
+#else  // !defined(__APPLE__)
+    ".globl PushAllRegistersAndIterateStack             \n"
+#if !defined(_WIN64)
+    ".type PushAllRegistersAndIterateStack, %function   \n"
+    ".hidden PushAllRegistersAndIterateStack            \n"
+#endif  // !defined(_WIN64)
+    ".p2align 2                                         \n"
+    "PushAllRegistersAndIterateStack:                   \n"
+#endif  // !defined(__APPLE__)
+    // x19-x29 are callee-saved.
+    "  stp x19, x20, [sp, #-16]!                        \n"
+    "  stp x21, x22, [sp, #-16]!                        \n"
+    "  stp x23, x24, [sp, #-16]!                        \n"
+    "  stp x25, x26, [sp, #-16]!                        \n"
+    "  stp x27, x28, [sp, #-16]!                        \n"
+#ifdef V8_ENABLE_CONTROL_FLOW_INTEGRITY
+    // Sign return address.
+    "  paciasp                                          \n"
+#endif
+    "  stp fp, lr,   [sp, #-16]!                        \n"
+    // Maintain frame pointer.
+    "  mov fp, sp                                       \n"
+    // Pass 1st parameter (x0) unchanged (Stack*).
+    // Pass 2nd parameter (x1) unchanged (StackVisitor*).
+    // Save 3rd parameter (x2; IterateStackCallback)
+    "  mov x7, x2                                       \n"
+    // Pass 3rd parameter as sp (stack pointer).
+    "  mov x2, sp                                       \n"
+    "  blr x7                                           \n"
+    // Load return address and frame pointer.
+    "  ldp fp, lr, [sp], #16                            \n"
+#ifdef V8_ENABLE_CONTROL_FLOW_INTEGRITY
+    // Authenticate return address.
+    "  autiasp                                          \n"
+#endif
+    // Drop all callee-saved registers.
+    "  add sp, sp, #80                                  \n"
+    "  ret                                              \n");