| /* |
| * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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| */ |
| |
| #ifndef CPU_SPARC_VM_FRAME_SPARC_HPP |
| #define CPU_SPARC_VM_FRAME_SPARC_HPP |
| |
| #include "runtime/synchronizer.hpp" |
| |
| // A frame represents a physical stack frame (an activation). Frames can be |
| // C or Java frames, and the Java frames can be interpreted or compiled. |
| // In contrast, vframes represent source-level activations, so that one physical frame |
| // can correspond to multiple source level frames because of inlining. |
| // A frame is comprised of {pc, sp, younger_sp} |
| |
| |
| // Layout of asm interpreter frame: |
| // |
| // 0xfffffff |
| // ...... |
| // [last extra incoming arg, (local # Nargs > 6 ? Nargs-1 : undef)] |
| // .. Note: incoming args are copied to local frame area upon entry |
| // [first extra incoming arg, (local # Nargs > 6 ? 6 : undef)] |
| // [6 words for C-arg storage (unused)] Are this and next one really needed? |
| // [C-aggregate-word (unused)] Yes, if want extra params to be in same place as C convention |
| // [16 words for register saving] <--- FP |
| // [interpreter_frame_vm_locals ] (see below) |
| |
| // Note: Llocals is always double-word aligned |
| // [first local i.e. local # 0] <-- Llocals |
| // ... |
| // [last local, i.e. local # Nlocals-1] |
| |
| // [monitors ] |
| // .... |
| // [monitors ] <-- Lmonitors (same as Llocals + 6*4 if none) |
| // (must be double-word aligned because |
| // monitor element size is constrained to |
| // doubleword) |
| // |
| // <-- Lesp (points 1 past TOS) |
| // [bottom word used for stack ] |
| // ... |
| // [top word used for stack] (first word of stack is double-word aligned) |
| |
| // [space for outgoing args (conservatively allocated as max_stack - 6 + interpreter_frame_extra_outgoing_argument_words)] |
| // [6 words for C-arg storage] |
| // [C-aggregate-word (unused)] |
| // [16 words for register saving] <--- SP |
| // ... |
| // 0x0000000 |
| // |
| // The in registers and local registers are preserved in a block at SP. |
| // |
| // The first six in registers (I0..I5) hold the first six locals. |
| // The locals are used as follows: |
| // Lesp first free element of expression stack |
| // (which grows towards __higher__ addresses) |
| // Lbcp is set to address of bytecode to execute |
| // It may at times (during GC) be an index instead. |
| // Lmethod the method being interpreted |
| // Llocals the base pointer for accessing the locals array |
| // (lower-numbered locals have lower addresses) |
| // Lmonitors the base pointer for accessing active monitors |
| // Lcache a saved pointer to the method's constant pool cache |
| // |
| // |
| // When calling out to another method, |
| // G5_method is set to method to call, G5_inline_cache_klass may be set, |
| // parameters are put in O registers, and also extra parameters |
| // must be cleverly copied from the top of stack to the outgoing param area in the frame, |
| |
| // All frames: |
| |
| public: |
| |
| enum { |
| // normal return address is 2 words past PC |
| pc_return_offset = 2 * BytesPerInstWord, |
| |
| // size of each block, in order of increasing address: |
| register_save_words = 16, |
| #ifdef _LP64 |
| callee_aggregate_return_pointer_words = 0, |
| #else |
| callee_aggregate_return_pointer_words = 1, |
| #endif |
| callee_register_argument_save_area_words = 6, |
| // memory_parameter_words = <arbitrary>, |
| |
| // offset of each block, in order of increasing address: |
| // (note: callee_register_argument_save_area_words == Assembler::n_register_parameters) |
| register_save_words_sp_offset = 0, |
| callee_aggregate_return_pointer_sp_offset = register_save_words_sp_offset + register_save_words, |
| callee_register_argument_save_area_sp_offset = callee_aggregate_return_pointer_sp_offset + callee_aggregate_return_pointer_words, |
| memory_parameter_word_sp_offset = callee_register_argument_save_area_sp_offset + callee_register_argument_save_area_words, |
| varargs_offset = memory_parameter_word_sp_offset |
| }; |
| |
| private: |
| intptr_t* _younger_sp; // optional SP of callee (used to locate O7) |
| int _sp_adjustment_by_callee; // adjustment in words to SP by callee for making locals contiguous |
| |
| // Note: On SPARC, unlike Intel, the saved PC for a stack frame |
| // is stored at a __variable__ distance from that frame's SP. |
| // (In fact, it may be in the register save area of the callee frame, |
| // but that fact need not bother us.) Thus, we must store the |
| // address of that saved PC explicitly. On the other hand, SPARC |
| // stores the FP for a frame at a fixed offset from the frame's SP, |
| // so there is no need for a separate "frame::_fp" field. |
| |
| public: |
| // Accessors |
| |
| intptr_t* younger_sp() const { |
| assert(_younger_sp != NULL, "frame must possess a younger_sp"); |
| return _younger_sp; |
| } |
| |
| int callee_sp_adjustment() const { return _sp_adjustment_by_callee; } |
| void set_sp_adjustment_by_callee(int number_of_words) { _sp_adjustment_by_callee = number_of_words; } |
| |
| // Constructors |
| |
| // This constructor relies on the fact that the creator of a frame |
| // has flushed register windows which the frame will refer to, and |
| // that those register windows will not be reloaded until the frame is |
| // done reading and writing the stack. Moreover, if the "younger_sp" |
| // argument points into the register save area of the next younger |
| // frame (though it need not), the register window for that next |
| // younger frame must also stay flushed. (The caller is responsible |
| // for ensuring this.) |
| |
| frame(intptr_t* sp, intptr_t* younger_sp, bool younger_frame_adjusted_stack = false); |
| |
| // make a deficient frame which doesn't know where its PC is: |
| enum unpatchable_t { unpatchable }; |
| frame(intptr_t* sp, unpatchable_t, address pc = NULL, CodeBlob* cb = NULL); |
| |
| void init(intptr_t* sp, address pc, CodeBlob* cb); |
| |
| // Walk from sp outward looking for old_sp, and return old_sp's predecessor |
| // (i.e. return the sp from the frame where old_sp is the fp). |
| // Register windows are assumed to be flushed for the stack in question. |
| |
| static intptr_t* next_younger_sp_or_null(intptr_t* old_sp, intptr_t* sp); |
| |
| // Return true if sp is a younger sp in the stack described by valid_sp. |
| static bool is_valid_stack_pointer(intptr_t* valid_sp, intptr_t* sp); |
| |
| public: |
| // accessors for the instance variables |
| intptr_t* fp() const { return (intptr_t*) ((intptr_t)(sp()[FP->sp_offset_in_saved_window()]) + STACK_BIAS ); } |
| |
| // All frames |
| |
| intptr_t* fp_addr_at(int index) const { return &fp()[index]; } |
| intptr_t* sp_addr_at(int index) const { return &sp()[index]; } |
| intptr_t fp_at( int index) const { return *fp_addr_at(index); } |
| intptr_t sp_at( int index) const { return *sp_addr_at(index); } |
| |
| private: |
| inline address* I7_addr() const; |
| inline address* O7_addr() const; |
| |
| inline address* I0_addr() const; |
| inline address* O0_addr() const; |
| intptr_t* younger_sp_addr_at(int index) const { return &younger_sp()[index]; } |
| |
| public: |
| // access to SPARC arguments and argument registers |
| |
| // Assumes reg is an in/local register |
| intptr_t* register_addr(Register reg) const { |
| return sp_addr_at(reg->sp_offset_in_saved_window()); |
| } |
| |
| // Assumes reg is an out register |
| intptr_t* out_register_addr(Register reg) const { |
| return younger_sp_addr_at(reg->after_save()->sp_offset_in_saved_window()); |
| } |
| |
| |
| // Interpreter frames |
| |
| public: |
| // Asm interpreter |
| enum interpreter_frame_vm_locals { |
| // 2 words, also used to save float regs across calls to C |
| interpreter_frame_d_scratch_fp_offset = -2, |
| interpreter_frame_l_scratch_fp_offset = -4, |
| interpreter_frame_padding_offset = -5, // for native calls only |
| interpreter_frame_oop_temp_offset = -6, // for native calls only |
| interpreter_frame_vm_locals_fp_offset = -6, // should be same as above, and should be zero mod 8 |
| |
| interpreter_frame_vm_local_words = -interpreter_frame_vm_locals_fp_offset, |
| |
| |
| // interpreter frame set-up needs to save 2 extra words in outgoing param area |
| // for class and jnienv arguments for native stubs (see nativeStubGen_sparc.cpp_ |
| |
| interpreter_frame_extra_outgoing_argument_words = 2 |
| }; |
| |
| enum compiler_frame_fixed_locals { |
| compiler_frame_vm_locals_fp_offset = -2 |
| }; |
| |
| private: |
| ConstantPoolCache** interpreter_frame_cpoolcache_addr() const; |
| |
| // where Lmonitors is saved: |
| inline BasicObjectLock** interpreter_frame_monitors_addr() const; |
| inline intptr_t** interpreter_frame_esp_addr() const; |
| |
| inline void interpreter_frame_set_tos_address(intptr_t* x); |
| |
| // monitors: |
| |
| // next two fns read and write Lmonitors value, |
| private: |
| BasicObjectLock* interpreter_frame_monitors() const; |
| void interpreter_frame_set_monitors(BasicObjectLock* monitors); |
| public: |
| |
| #endif // CPU_SPARC_VM_FRAME_SPARC_HPP |