1 /*===-- llvm-c/Disassembler.h - Disassembler Public C Interface ---*- C -*-===*\ 2 |* *| 3 |* The LLVM Compiler Infrastructure *| 4 |* *| 5 |* This file is distributed under the University of Illinois Open Source *| 6 |* License. See LICENSE.TXT for details. *| 7 |* *| 8 |*===----------------------------------------------------------------------===*| 9 |* *| 10 |* This header provides a public interface to a disassembler library. *| 11 |* LLVM provides an implementation of this interface. *| 12 |* *| 13 \*===----------------------------------------------------------------------===*/ 14 15 #ifndef LLVM_C_DISASSEMBLER_H 16 #define LLVM_C_DISASSEMBLER_H 17 18 #include "llvm/Support/DataTypes.h" 19 #include <stddef.h> 20 21 /** 22 * @defgroup LLVMCDisassembler Disassembler 23 * @ingroup LLVMC 24 * 25 * @{ 26 */ 27 28 /** 29 * An opaque reference to a disassembler context. 30 */ 31 typedef void *LLVMDisasmContextRef; 32 33 /** 34 * The type for the operand information call back function. This is called to 35 * get the symbolic information for an operand of an instruction. Typically 36 * this is from the relocation information, symbol table, etc. That block of 37 * information is saved when the disassembler context is created and passed to 38 * the call back in the DisInfo parameter. The instruction containing operand 39 * is at the PC parameter. For some instruction sets, there can be more than 40 * one operand with symbolic information. To determine the symbolic operand 41 * information for each operand, the bytes for the specific operand in the 42 * instruction are specified by the Offset parameter and its byte widith is the 43 * size parameter. For instructions sets with fixed widths and one symbolic 44 * operand per instruction, the Offset parameter will be zero and Size parameter 45 * will be the instruction width. The information is returned in TagBuf and is 46 * Triple specific with its specific information defined by the value of 47 * TagType for that Triple. If symbolic information is returned the function 48 * returns 1, otherwise it returns 0. 49 */ 50 typedef int (*LLVMOpInfoCallback)(void *DisInfo, uint64_t PC, 51 uint64_t Offset, uint64_t Size, 52 int TagType, void *TagBuf); 53 54 /** 55 * The initial support in LLVM MC for the most general form of a relocatable 56 * expression is "AddSymbol - SubtractSymbol + Offset". For some Darwin targets 57 * this full form is encoded in the relocation information so that AddSymbol and 58 * SubtractSymbol can be link edited independent of each other. Many other 59 * platforms only allow a relocatable expression of the form AddSymbol + Offset 60 * to be encoded. 61 * 62 * The LLVMOpInfoCallback() for the TagType value of 1 uses the struct 63 * LLVMOpInfo1. The value of the relocatable expression for the operand, 64 * including any PC adjustment, is passed in to the call back in the Value 65 * field. The symbolic information about the operand is returned using all 66 * the fields of the structure with the Offset of the relocatable expression 67 * returned in the Value field. It is possible that some symbols in the 68 * relocatable expression were assembly temporary symbols, for example 69 * "Ldata - LpicBase + constant", and only the Values of the symbols without 70 * symbol names are present in the relocation information. The VariantKind 71 * type is one of the Target specific #defines below and is used to print 72 * operands like "_foo@GOT", ":lower16:_foo", etc. 73 */ 74 struct LLVMOpInfoSymbol1 { 75 uint64_t Present; /* 1 if this symbol is present */ 76 const char *Name; /* symbol name if not NULL */ 77 uint64_t Value; /* symbol value if name is NULL */ 78 }; 79 80 struct LLVMOpInfo1 { 81 struct LLVMOpInfoSymbol1 AddSymbol; 82 struct LLVMOpInfoSymbol1 SubtractSymbol; 83 uint64_t Value; 84 uint64_t VariantKind; 85 }; 86 87 /** 88 * The operand VariantKinds for symbolic disassembly. 89 */ 90 #define LLVMDisassembler_VariantKind_None 0 /* all targets */ 91 92 /** 93 * The ARM target VariantKinds. 94 */ 95 #define LLVMDisassembler_VariantKind_ARM_HI16 1 /* :upper16: */ 96 #define LLVMDisassembler_VariantKind_ARM_LO16 2 /* :lower16: */ 97 98 /** 99 * The type for the symbol lookup function. This may be called by the 100 * disassembler for things like adding a comment for a PC plus a constant 101 * offset load instruction to use a symbol name instead of a load address value. 102 * It is passed the block information is saved when the disassembler context is 103 * created and the ReferenceValue to look up as a symbol. If no symbol is found 104 * for the ReferenceValue NULL is returned. The ReferenceType of the 105 * instruction is passed indirectly as is the PC of the instruction in 106 * ReferencePC. If the output reference can be determined its type is returned 107 * indirectly in ReferenceType along with ReferenceName if any, or that is set 108 * to NULL. 109 */ 110 typedef const char *(*LLVMSymbolLookupCallback)(void *DisInfo, 111 uint64_t ReferenceValue, 112 uint64_t *ReferenceType, 113 uint64_t ReferencePC, 114 const char **ReferenceName); 115 /** 116 * The reference types on input and output. 117 */ 118 /* No input reference type or no output reference type. */ 119 #define LLVMDisassembler_ReferenceType_InOut_None 0 120 121 /* The input reference is from a branch instruction. */ 122 #define LLVMDisassembler_ReferenceType_In_Branch 1 123 /* The input reference is from a PC relative load instruction. */ 124 #define LLVMDisassembler_ReferenceType_In_PCrel_Load 2 125 126 /* The output reference is to as symbol stub. */ 127 #define LLVMDisassembler_ReferenceType_Out_SymbolStub 1 128 /* The output reference is to a symbol address in a literal pool. */ 129 #define LLVMDisassembler_ReferenceType_Out_LitPool_SymAddr 2 130 /* The output reference is to a cstring address in a literal pool. */ 131 #define LLVMDisassembler_ReferenceType_Out_LitPool_CstrAddr 3 132 133 #ifdef __cplusplus 134 extern "C" { 135 #endif /* !defined(__cplusplus) */ 136 137 /** 138 * Create a disassembler for the TripleName. Symbolic disassembly is supported 139 * by passing a block of information in the DisInfo parameter and specifying the 140 * TagType and callback functions as described above. These can all be passed 141 * as NULL. If successful, this returns a disassembler context. If not, it 142 * returns NULL. This function is equivalent to calling LLVMCreateDisasmCPU() 143 * with an empty CPU name. 144 */ 145 LLVMDisasmContextRef LLVMCreateDisasm(const char *TripleName, void *DisInfo, 146 int TagType, LLVMOpInfoCallback GetOpInfo, 147 LLVMSymbolLookupCallback SymbolLookUp); 148 149 /** 150 * Create a disassembler for the TripleName and a specific CPU. Symbolic 151 * disassembly is supported by passing a block of information in the DisInfo 152 * parameter and specifying the TagType and callback functions as described 153 * above. These can all be passed * as NULL. If successful, this returns a 154 * disassembler context. If not, it returns NULL. 155 */ 156 LLVMDisasmContextRef LLVMCreateDisasmCPU(const char *Triple, const char *CPU, 157 void *DisInfo, int TagType, 158 LLVMOpInfoCallback GetOpInfo, 159 LLVMSymbolLookupCallback SymbolLookUp); 160 161 /** 162 * Set the disassembler's options. Returns 1 if it can set the Options and 0 163 * otherwise. 164 */ 165 int LLVMSetDisasmOptions(LLVMDisasmContextRef DC, uint64_t Options); 166 167 /* The option to produce marked up assembly. */ 168 #define LLVMDisassembler_Option_UseMarkup 1 169 /* The option to print immediates as hex. */ 170 #define LLVMDisassembler_Option_PrintImmHex 2 171 /* The option use the other assembler printer variant */ 172 #define LLVMDisassembler_Option_AsmPrinterVariant 4 173 174 /** 175 * Dispose of a disassembler context. 176 */ 177 void LLVMDisasmDispose(LLVMDisasmContextRef DC); 178 179 /** 180 * Disassemble a single instruction using the disassembler context specified in 181 * the parameter DC. The bytes of the instruction are specified in the 182 * parameter Bytes, and contains at least BytesSize number of bytes. The 183 * instruction is at the address specified by the PC parameter. If a valid 184 * instruction can be disassembled, its string is returned indirectly in 185 * OutString whose size is specified in the parameter OutStringSize. This 186 * function returns the number of bytes in the instruction or zero if there was 187 * no valid instruction. 188 */ 189 size_t LLVMDisasmInstruction(LLVMDisasmContextRef DC, uint8_t *Bytes, 190 uint64_t BytesSize, uint64_t PC, 191 char *OutString, size_t OutStringSize); 192 193 /** 194 * @} 195 */ 196 197 #ifdef __cplusplus 198 } 199 #endif /* !defined(__cplusplus) */ 200 201 #endif /* !defined(LLVM_C_DISASSEMBLER_H) */ 202
