13ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// Copyright 2012 the V8 project authors. All rights reserved. 2b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// Use of this source code is governed by a BSD-style license that can be 3b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// found in the LICENSE file. 4a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 5a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifndef V8_ARM_FRAMES_ARM_H_ 6a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#define V8_ARM_FRAMES_ARM_H_ 7a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 8a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blocknamespace v8 { 9a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blocknamespace internal { 10a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 11a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 12a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// The ARM ABI does not specify the usage of register r9, which may be reserved 13a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// as the static base or thread register on some platforms, in which case we 14a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// leave it alone. Adjust the value of kR9Available accordingly: 153ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdochconst int kR9Available = 1; // 1 if available to us, 0 if reserved 16a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 17a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 18a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Register list in load/store instructions 19a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Note that the bit values must match those used in actual instruction encoding 203ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdochconst int kNumRegs = 16; 21a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 22a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 23a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Caller-saved/arguments registers 243ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdochconst RegList kJSCallerSaved = 25a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 1 << 0 | // r0 a1 26a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 1 << 1 | // r1 a2 27a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 1 << 2 | // r2 a3 28a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 1 << 3; // r3 a4 29a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 303ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdochconst int kNumJSCallerSaved = 4; 31a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 32a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Return the code of the n-th caller-saved register available to JavaScript 33a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// e.g. JSCallerSavedReg(0) returns r0.code() == 0 34a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockint JSCallerSavedCode(int n); 35a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 36a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 37a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Callee-saved registers preserved when switching from C to JavaScript 383ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdochconst RegList kCalleeSaved = 39a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 1 << 4 | // r4 v1 40a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 1 << 5 | // r5 v2 41a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 1 << 6 | // r6 v3 42b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch 1 << 7 | // r7 v4 (cp in JavaScript code) 43b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch 1 << 8 | // r8 v5 (pp in JavaScript code) 441e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block kR9Available << 9 | // r9 v6 45a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 1 << 10 | // r10 v7 46a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 1 << 11; // r11 v8 (fp in JavaScript code) 47a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 483ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// When calling into C++ (only for C++ calls that can't cause a GC). 493ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// The call code will take care of lr, fp, etc. 503ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdochconst RegList kCallerSaved = 513ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch 1 << 0 | // r0 523ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch 1 << 1 | // r1 533ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch 1 << 2 | // r2 543ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch 1 << 3 | // r3 553ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch 1 << 9; // r9 563ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch 573ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch 583ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdochconst int kNumCalleeSaved = 7 + kR9Available; 59a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 607d3e7fc4b65010eabe860313ee0c64f50843f6e3Ben Murdoch// Double registers d8 to d15 are callee-saved. 613ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdochconst int kNumDoubleCalleeSaved = 8; 627d3e7fc4b65010eabe860313ee0c64f50843f6e3Ben Murdoch 63a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 64b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch// Number of registers for which space is reserved in safepoints. Must be a 65b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch// multiple of 8. 66b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch// TODO(regis): Only 8 registers may actually be sufficient. Revisit. 673ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdochconst int kNumSafepointRegisters = 16; 68b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch 69014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch// The embedded constant pool pointer (r8/pp) is not included in the safepoint 70014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch// since it is not tagged. This register is preserved in the stack frame where 71014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch// its value will be updated if GC code movement occurs. Including it in the 72014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch// safepoint (where it will not be relocated) would cause a stale value to be 73014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch// restored. 74014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdochconst RegList kConstantPointerRegMask = 75014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch FLAG_enable_embedded_constant_pool ? (1 << 8) : 0; 76014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdochconst int kNumConstantPoolPointerReg = 77014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch FLAG_enable_embedded_constant_pool ? 1 : 0; 78014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch 79b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch// Define the list of registers actually saved at safepoints. 80b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch// Note that the number of saved registers may be smaller than the reserved 81b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch// space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters. 82014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdochconst RegList kSafepointSavedRegisters = 83014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch kJSCallerSaved | (kCalleeSaved & ~kConstantPointerRegMask); 84014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdochconst int kNumSafepointSavedRegisters = 85014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch kNumJSCallerSaved + kNumCalleeSaved - kNumConstantPoolPointerReg; 86b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch 87a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// ---------------------------------------------------- 88a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 89a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 90a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockclass EntryFrameConstants : public AllStatic { 91a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 92b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch static const int kCallerFPOffset = 93b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch -(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize); 94a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 95a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 963b9bc31999c9787eb726ecdbfd5796bfdec32a18Ben Murdochclass ExitFrameConstants : public TypedFrameConstants { 97a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 983b9bc31999c9787eb726ecdbfd5796bfdec32a18Ben Murdoch static const int kSPOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); 993b9bc31999c9787eb726ecdbfd5796bfdec32a18Ben Murdoch static const int kCodeOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1); 1003b9bc31999c9787eb726ecdbfd5796bfdec32a18Ben Murdoch DEFINE_TYPED_FRAME_SIZES(2); 101a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 102a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // The caller fields are below the frame pointer on the stack. 1031e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block static const int kCallerFPOffset = 0 * kPointerSize; 1041e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block // The calling JS function is below FP. 1051e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block static const int kCallerPCOffset = 1 * kPointerSize; 106a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 107a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // FP-relative displacement of the caller's SP. It points just 108a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // below the saved PC. 1091e0659c275bb392c045087af4f6b0d7565cb3d77Steve Block static const int kCallerSPDisplacement = 2 * kPointerSize; 110a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 111a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 112a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 113a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockclass JavaScriptFrameConstants : public AllStatic { 114a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 115a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // FP-relative. 116a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; 1178b112d2025046f85ef7f6be087c6129c872ebad2Ben Murdoch static const int kLastParameterOffset = +2 * kPointerSize; 1183b9bc31999c9787eb726ecdbfd5796bfdec32a18Ben Murdoch static const int kFunctionOffset = StandardFrameConstants::kFunctionOffset; 119a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 120a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Caller SP-relative. 121a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static const int kParam0Offset = -2 * kPointerSize; 122a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static const int kReceiverOffset = -1 * kPointerSize; 123a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 124a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 125a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 126014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch} // namespace internal 127014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch} // namespace v8 128a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 129a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif // V8_ARM_FRAMES_ARM_H_ 130