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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 
12 static uintptr_t sp_addr = 0;
13 
GetStackPointer(const v8::FunctionCallbackInfo<v8::Value> & args)14 void 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 
TEST(StackAlignment)36 TEST(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