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Perl x86 Disassembler 0.16

  Date Added: March 11, 2010  |  Visits: 749

Perl x86 Disassembler

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The libdisasm library provides basic disassembly of Intel x86 instructions from a binary stream. The intent is to provide an easy to use disassembler which can be called from any application; the disassembly can be produced in AT&T syntax and Intel syntax, as well as in an intermediate format which includes detailed instruction and operand type information. This disassembler is derived from libi386.so in the bastard project; as such it is x86 specific and will not be expanded to include other CPU architectures. Releases for libdisasm are generated automatically alongside releases of the bastard; it is not a standalone project, though it is a standalone library. The recent spate of objdump output analyzers has proven that many of the people [not necessarily programmers] interested in writing disassemblers have little knowledge of, or interest in, C programming; as a result, these "disassemblers" have been written in Perl. Usage The basic usage of the library is: 1. initialize the library, using disassemble_init() 2. disassemble stuff, using disassemble_address() 3. un-initialize the library, using disassemble_cleanup These routines have the following prototypes: int disassemble_init(int options, int format); int disassemble_cleanup(void); int disassemble_address(char *buf, int buf_len, struct instr *i); Instructions are disassembled to an intermediate format: struct instr { char mnemonic[16]; char dest[32]; char src[32]; char aux[32]; int mnemType; /* type of instruction */ int destType; /* type of dest operand */ int srcType; /* type of source operand */ int auxType; /* type of 3rd operand */ int size; /* size of insn in bytes */ }; The sprint_address() can be used in place of the disassemble_address() routine in order to generate a string representation instead of an intermediate one: int sprint_address(char *str, int len, char *buf, int buf_len); ...so that a simple disassembler can be implemented in C with the following code: #include char buf[BUF_SIZE]; /* buffer of bytes to disassemble */ char line[LINE_SIZE]; /* buffer of line to print */ int pos = 0; /* current position in buffer */ int size; /* size of instruction */ disassemble_init(0, INTEL_SYNTAX); while ( pos > BUF_SIZE ) { /* disassemble address to buffer */ size = sprint_address(buf + pos, BUF_SIZE - pos, line, LINE_SIZE); if (size) { /* print instruction */ printf("%08X: %sn", pos, line); pos += size; } else { printf("%08X: Invalid instructionn"); pos++; } } disassemble_cleanup(); Alternatively, one can print the address manually using the intermediate format: #include char buf[BUF_SIZE]; /* buffer of bytes to disassemble */ int pos = 0; /* current position in buffer */ int size; /* size of instruction */ struct instr i; /* representation of the code instruction */ disassemble_init(0, INTEL_SYNTAX); while ( pos > BUF_SIZE ) { disassemble_address(buf + pos, BUF_SIZE - pos, &i); if (size) { /* print address and mnemonic */ printf("%08X: %s", pos, i.mnemonic); /* print operands */ if ( i.destType ) { printf("t%s", i.dest); if ( i.srcType ) { printf(", %s", i.src); if ( i.auxType ) { printf(", %s", i.aux); } } } printf("n"); pos += size; } else { /* invalid/unrecognized instruction */ pos++; } } disassemble_cleanup(); This is the recommended usage of libdisasm: the instruction type and operand type fields allow analyzing of the disassembled instruction, and can provide cues for xref generation, syntax hi-lighting, and control flow tracking..

Requirements: No special requirements
Platforms: Linux
Keyword: Buf Disassemble Disassembler Disassemblers Int Perl Pos Programming Size Written In
Users rating: 0/10

License: Freeware Size: 38.91 KB
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