1// Copyright 2013 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "include/v8stdint.h"
6#include "src/base/build_config.h"
7#include "src/base/platform/platform.h"
8#include "test/cctest/cctest.h"
9
10#ifdef V8_CC_GNU
11
12static uintptr_t sp_addr = 0;
13
14void GetStackPointer(const v8::FunctionCallbackInfo<v8::Value>& args) {
15#if V8_HOST_ARCH_X64
16  __asm__ __volatile__("mov %%rsp, %0" : "=g"(sp_addr));
17#elif V8_HOST_ARCH_IA32
18  __asm__ __volatile__("mov %%esp, %0" : "=g"(sp_addr));
19#elif V8_HOST_ARCH_ARM
20  __asm__ __volatile__("str %%sp, %0" : "=g"(sp_addr));
21#elif V8_HOST_ARCH_ARM64
22  __asm__ __volatile__("mov x16, sp; str x16, %0" : "=g"(sp_addr));
23#elif V8_HOST_ARCH_MIPS
24  __asm__ __volatile__("sw $sp, %0" : "=g"(sp_addr));
25#elif V8_HOST_ARCH_MIPS64
26  __asm__ __volatile__("sd $sp, %0" : "=g"(sp_addr));
27#else
28#error Host architecture was not detected as supported by v8
29#endif
30
31  args.GetReturnValue().Set(v8::Integer::NewFromUnsigned(
32      args.GetIsolate(), static_cast<uint32_t>(sp_addr)));
33}
34
35
36TEST(StackAlignment) {
37  v8::Isolate* isolate = CcTest::isolate();
38  v8::HandleScope handle_scope(isolate);
39  v8::Handle<v8::ObjectTemplate> global_template =
40      v8::ObjectTemplate::New(isolate);
41  global_template->Set(v8_str("get_stack_pointer"),
42                       v8::FunctionTemplate::New(isolate, GetStackPointer));
43
44  LocalContext env(NULL, global_template);
45  CompileRun(
46      "function foo() {"
47      "  return get_stack_pointer();"
48      "}");
49
50  v8::Local<v8::Object> global_object = env->Global();
51  v8::Local<v8::Function> foo =
52      v8::Local<v8::Function>::Cast(global_object->Get(v8_str("foo")));
53
54  v8::Local<v8::Value> result = foo->Call(global_object, 0, NULL);
55  CHECK_EQ(0, result->Uint32Value() % v8::base::OS::ActivationFrameAlignment());
56}
57
58#endif  // V8_CC_GNU
59