parsing:
Where:
"#00 PC511150d0/Data/COM. Test/lib/Test. So"Indicates that the Code pointed to by the PC value in the current program pointer register is in the"/data/COM. Mainframe/lib/test. So "dynamic library,
"#01 Ra 5110f708/data/COM. mainframe/lib/test. "So" indicates that the returned address pointer (also the value in the Link register LR) is in "/data/COM. mainframe/lib/test. so "dynamic library,
It is generally considered that:
The exception is caused by "#01 Ra 5110f708/data/COM. m
Debug: A (assembly)
Directly merge the 8086/8087/8088 Memory code into the memory.
This command creates executable machine codes from assembly language statements. All values are in hexadecimal format and must be entered by one to four characters. Specify
Prefix memory.
A [address]
Parameters
Address
Specifies the location where the assembly language instruction is entered. Use a hexadecimal value for address and type each value that does not end with the character "H. If no address is specified
IL_0011: add IL_0012: stloc.0 IL_0013: ldloc.0 IL_0014: call void [mscorlib]System.Console::WriteLine(int32) IL_0019: nop IL_001a: call valuetype [mscorlib]System.ConsoleKeyInfo [mscorlib]System.Console::ReadKey() IL_001f: pop IL_0020: ret } // end of method Program::Main
Through the Il code, we can clearly see its computing process:
0 ~ The four rows assign values to the variables. In the call stack, 0 indicates that the C value
,For example: Objdump-b oasys-m vax-h FU.ODisplays the header summary information of the FU.O, stating clearly that the file is used under the VAX system OasysThe target file generated by the compiler. Objdump-i will give you what you can specify here.Destination Code Format list--demangle-C decodes the underlying symbol name into a user-level name, except to remove all openingsUnderline, it also makes the C + + function name appear in an understandable way.--debuggingDisplays debugging informat
Breakpoints
Ctrl + Shift + F9
Clears all breakpoints in the project.
Debugging. Disassembly
Ctrl + Alt + D
Displays the Disassembly window.
Debugging. Enabling breakpoints
Ctrl + F9
Switch the breakpoint from disabled to Enabled.
Debugging. Exceptions
Ctrl + D , Ctrl + E
Displays the Exceptions dialog box.
Debug
In the interview process, often there will be the interviewer asked the basic question when the Java Disassembly box, about the problem is not very difficult, but if you do not pay attention to self-study, it may be a face confused, so I do some summary of this issue, and jointly promote!First, the concept of unboxingThe so-called disassembly box is the conversion between Java's basic type and reference typ
The previous few talk about GDB Debug program's post, all to disassembly vague. Here's a detailed discussion of the Disassemble/disass command.Disassembly a functionDisass Func_nameDisassemble a memory address, the 1th parameter is the start address, and the 2nd is the terminating addressDisassemble 0x0 0x10First look at document debugging with GDBHttp://sourceware.org/gdb/download/onlinedocs/gdb.htmlSource and Machine codeYou can use the info command
managing the cache, so it became my preferred target.
In this way, I infer that the data is read and written through DMA without any CPU action. Now the question is: Since the CPU will not be exposed to data in normal operations, can the CPU (abnormally) be exposed to data? To answer this question, I first used the JTAG connection and used some disassembly to check the memory of Feroceon2.
As you can see, the memory graph is fragmented. There are so
There are 8 basic data types in Java, these eight basic data types have corresponding package types, the following is the corresponding relationship:Int--integerfloat--floatdouble--doublebyte--bytelong--longchar--characterboolean--booleanshort--shortThe basic data type and its corresponding package types can be converted to each other, from the basic data type to the package type is called boxing, from the package type to the basic data type called unboxing, automatic unboxing is a new feature p
I used to learn C ++ by myself. Now, in retrospect, I didn't understand anything at the time. C ++ cannot be used, but C ++ is leading the way. In high school, noip is not allowed to use the STL library. in the competition, the C ++ object-oriented mechanism is basically useless. Therefore, the noip name in high school is C ++, in fact, cout and CIN are added to C.
A few days ago, I read the old CAPTCHA document by Han, which recorded some C ++ object-oriented mechanism explorations and arouse
Let's say a few times. I just learned how to crack it a few days ago. Excellent in the Forum Article It helped me a lot. However, when I use OD, I do not use command lines to break down the function. Although the OD command line supports fuzzy search, it still does not feel very convenient, So I sorted out the commands supported by the OD and sent them up. I like to help you with your learning.? The/calc expression calculates the given expression. Note that the value involved in calculation is i
the constructor has done, I will analyze the above Assembly statements row by row:
7 This-> X = X;0x080484fd 0x08048500 0x08048503
MoV eax, dword ptr [EBP + 0x8] stores the value of the first parameter of the function in the register eax.MoV edX, dword ptr [EBP + 0xc] stores the value of the second parameter of the function in the edX register.MoV dword ptr [eax], EDX writes the value of the edx register to the memory pointed to by eax
Combined with this-> X = x; this c ++ code, we can boldly
this is the same as debug even in release, this local variable is not saved unless there is an optimization operation in the release. So I will check the versions of debug and release.
Debug:
Il_0000: NOPIl_0001: newobj TC:. ctorIl_0006: stloc.0Il_0007: Call system. GC: CollectIl_000c: NOPIl_000d: Call system. GC: waitforpendingfinalizersIl_0012: NOPIl_0013: Br. s il_0015Il_0015: Ret
Release:
Iladdr = 01394590Il_0000: newobj TC:. ctorIl_0005: PopIl_0006: Call system. GC: CollectIl_000b: Call sy
In the standard Python library, many libraries are used for python compilation and decompilation (ER, to be exact, disassembly ). These libraries are listed in the "Python language services" section of "Python Library Reference" in the python documentation. Dis is one of them. The official description is "discycler for python byte code"
In layman's terms, DIS is the sequence of bytecode commands in the compiled results of Python.Anti-Assembler. The ru
-linux-ld-Ttext 0x00000000 crt0.o led_on_c.o-o led_on_c_tmp.o. Let's see what it means: -o option: Set the name of the output file to led_on_c_tmp.o; "-- Ttext 0x00000000": Set the starting address of the code segment to 0x00000000; this command is used to connect crt0.o and led_on_c.o to the led_on_c_mp.o executable file. The starting address of the code segment of this executable file is 0x00000000. We are interested in the "-Ttext" option! Enter the LINK directory. the s Code is as follows: 1
is similar to-D, but disassembles all sections.-- Prefix-AddressesThe complete address of each line is displayed during disassembly. This is an old disassembly format.The display effect is not ideal, but some of them may be used for comparison.-- Disassemble-ZeroesGenerally, the zero part of the large part will be omitted in the disassembly output. This option w
threads.
In fact, I want to find out what the childebp/retaddr respectively refers to: K First, check the stack:Kd> K
Childebp retaddr
0012fb1c 7c95e612 NTDLL! Dbgbreakpoint
0012fc94 7c940000f NTDLL! Ldrpinitializeprocess + 0 xffa
0012fd1c 7c92e437 NTDLL! _ Ldrpinalize + 0x183
00000000 00000000 NTDLL! Kiuserapcdispatcher + 0x7
Then open the Disassembly window:Ntdll! Dbgbreakpoint:
7c92120e cc int 3
Currently running to this line: Use r ebp
The bottom of the LCD is mainly divided into two parts, the base and the shaft, disassembly is also relatively simple, starting from the base, the following is the specific steps:
A. Base Disassembly
First, the LCD flat on the table, note that the table must be flat, and the desktop does not have any sundries, so as not to bump damage to the LCD screen, of course, if the bottom can put some sponge or othe
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