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87 lines
4.5 KiB
87 lines
4.5 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_INTERPRETER_CFI_ASM_SUPPORT_H_
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#define ART_RUNTIME_INTERPRETER_CFI_ASM_SUPPORT_H_
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#if !defined(__APPLE__)
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/*
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* Define the DEX PC (memory address of the currently interpreted bytecode)
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* within the CFI stream of the current function (stored in .eh_frame).
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* This allows libunwind to detect that the frame is in the interpreter,
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* and to resolve the memory address into human readable Java method name.
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* The CFI instruction is recognised by the magic bytes in the expression
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* (we push magic "DEX1" constant on the DWARF stack and drop it again).
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*
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* As with any other CFI opcode, the expression needs to be associated with
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* a register. Any caller-save register will do as those are unused in CFI.
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* Better solution would be to store the expression in Android-specific
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* DWARF register (CFI registers don't have to correspond to real hardware
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* registers), however, gdb handles any unknown registers very poorly.
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* Similarly, we could also use some of the user-defined opcodes defined
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* in the DWARF specification, but gdb doesn't support those either.
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*
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* The DEX PC is generally advanced in the middle of the bytecode handler,
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* which will result in the reported DEX PC to be off by an instruction.
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* Therefore the macro allows adding/subtracting an offset to compensate.
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* TODO: Add the offsets to handlers to get line-accurate DEX PC reporting.
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*/
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#define CFI_DEFINE_DEX_PC_WITH_OFFSET(tmpReg, dexReg, dexOffset) .cfi_escape \
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0x16 /* DW_CFA_val_expression */, tmpReg, 0x09 /* size */, \
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0x0c /* DW_OP_const4u */, 0x44, 0x45, 0x58, 0x31, /* magic = "DEX1" */ \
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0x13 /* DW_OP_drop */, \
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0x92 /* DW_OP_bregx */, dexReg, (dexOffset & 0x7F) /* 1-byte SLEB128 */
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#define CFI_DEF_CFA_BREG_PLUS_UCONST_1_1(reg, offset, size) .cfi_escape \
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0x0f /* DW_CFA_def_cfa_expression */, 6 /* size */, \
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0x92 /* bregx */, reg, (offset & 0x7F), \
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0x06 /* DW_OP_DEREF */, \
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0x23 /* DW_OP_plus_uconst */, size
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#define CFI_DEF_CFA_BREG_PLUS_UCONST_1_2(reg, offset, size) .cfi_escape \
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0x0f /* DW_CFA_def_cfa_expression */, 7 /* size */, \
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0x92 /* bregx */, reg, (offset & 0x7F), \
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0x06 /* DW_OP_DEREF */, \
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0x23 /* DW_OP_plus_uconst */, \
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((size) & 0x7f) | 0x80, /* ULEB128 offset, byte 1 */ \
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((size) >> 7) & 0x7f /* ULEB128 offset, byte 2 */
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#define CFI_EXPRESSION_BREG_1(n, b, offset) .cfi_escape \
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0x10, /* DW_CFA_expression */ \
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n, /* rule for register n */ \
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2, /* expression length */ \
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0x70+b, /* DW_OP_BREG<b>() */ \
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(offset) & 0x7f /* SLEB128 offset */
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#define CFI_EXPRESSION_BREG_2(n, b, offset) .cfi_escape \
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0x10, /* DW_CFA_expression */ \
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n, /* rule for register n */ \
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3, /* expression length */ \
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0x70+b, /* DW_OP_BREG<b>() */ \
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((offset) & 0x7f) | 0x80, /* SLEB128 offset, byte 1 */ \
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((offset) >> 7) & 0x7f /* SLEB128 offset, byte 2 */
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#else
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// Mac OS doesn't like cfi_* directives.
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#define CFI_DEFINE_DEX_PC_WITH_OFFSET(tmpReg, dexReg, dexOffset)
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#define CFI_DEF_CFA_BREG_PLUS_UCONST_1_1(reg, offset, size)
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#define CFI_DEF_CFA_BREG_PLUS_UCONST_1_2(reg, offset, size)
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#define CFI_EXPRESSION_BREG_1(n, b, offset)
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#define CFI_EXPRESSION_BREG_2(n, b, offset)
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#endif
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#endif // ART_RUNTIME_INTERPRETER_CFI_ASM_SUPPORT_H_
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