mips assembly language

Interrupt: Is an important technique for CPU to handle external emergencies. External interrupts: Interrupts that can be shielded (keyboard interrupts, printer interrupts, etc.) Internal interrupt: Due to hardware error or operation error, etc. Based on the interrupt type code, locate the interrupt handler and need to know its segment address and offset address Access to interrupt handlers can be found through the interrupt vector table Interrupt vector table specified for storage at memory ad

1.8086 Transfer Instruction Classification: Unconditional Jump instruction: JMP Conditional Transfer directives: Loop command: Loop Procedure (function equivalent to C) Interrupt () The operator offset is a compiler-processed symbol in assembly language, and his function is to get the offset address of the label Start:mov ax,offset start; equivalent to mov ax,0 JMP unconditionally jumps, can only modify

"Copyright Notice: respect for the original, reproduced please retain the source: blog.csdn.net/shallnet, the article only for learning Exchange, do not use for commercial purposes"in fact, in assembly language can also use C library functions, this section we look at how to call C library function in assembly language

1, only "BX, Si, Di, BP" Four registers can be used in the [...] To address the memory cells in the2. These four registers can appear either individually or in [By+zi] form, where y=x or p,z = s or D, other formats are incorrect.3, when using BP, if not explicitly given the segment address, then the segment address by default in the SS segment register.4, assembly language with three concepts to express the

IntroductionThe 8086CPU transfer instruction is divided into the following categories:Unconditional transfer instructions (e.g., JMP)Conditional Transfer Directivesloop instructions (e.g. loop)ProcessInterrupt9.1 Operator OffsetThe operator offset is a symbol that is handled by the compiler in assembly language, and its function is to obtain the offset address of the label.9.2 JMP InstructionsJMP is uncondi

1, only "BX, Si, Di, BP" Four registers can be used in the [...] To address the memory cells in the2. These four registers can appear either individually or in [By+zi] form, where y=x or p,z = s or D, other formats are wrong.3, when using BP. Assume that the segment address is not explicitly given. The segment address defaults to the SS segment register.4, assembly language with three concepts to express th

operand consists of a operand-constriant string and a C-language expression immediately following the parentheses. The colon separates the assembly instruction from the operand. int a=10, B; ASM ("Movl%1,%%eax; MOVL%%eax,%0; " :" =r "(b)/ * output */ :" R "(a)/ * input */ :"%eax "/ * clobbered Register */

small byte order. For example, 1 is written to 4 bytes in hexadecimal format: 01 00 00 00 (the low position first appears ); Hll (advanced language) classification: 1. compilation language 2. explanation language Procedure: 1. Compile the Hll statement into the original script code; 2. Connect the original script code to generate an executable program;

always points to the available data in the next stack. In sequence, we load data A, B, and C to the stack in sequence. Thread Stack In Win32, every time a thread is created, the virtual memory of 1 MB (1 million, one thousand, one thousand) is retained as the stack space, used by this thread. The ESP register points to the top of the reserved memory (the end with the largest address), so that the stack is initialized. To check the value of the current stack pointer, you can use th

determines their characteristics: 1, scope. Global variables are available everywhere in the program, and local variables can only be used in defined functions. 2, life cycle. The life cycle of a global variable is the same as the whole program, and the life cycle of a local variable is the same as a function, which is released as the function ends. This method is more advantageous to reduce the memory cost of the program, avoid the variable definition error, ensure the independence of the func

maximum.2.9 Segment RegistersThe segment register is the one that provides the segment address.8086CPU has 4 segment registers: CS, DS, SS, ES2.10 CS and IPCS and IP are the most critical registers in 8086CPU, and they indicate the address at which the CPU is currently reading instructions.1.CS is the code segment register;2.IP is the instruction pointer register.(1) from the Cs:ip point to the memory unit read instruction, read the instruction into the command buffer;(2) IP = IP + The length o

value, the space does not modify or continue to the next, enter the end; the second form e 1000:0 "FDFD" "DFDS" 12 121; with-R can be viewed, but the machine code is written such as: B8 (mov ax,0001), b90200 (mov cx, 0002), 01c8 (add ax,cx), the-D command cannot display the code, can be viewed with the-u command (Shape u 1000:0)The-t command can be used to execute the instructions we write, but you must first have Cs:ip point to the command unit you want to execute, one instruction at a time:Ea

address, you can use R14 between calls for other purposes, and when the program returns, the R15 is the program counter PC. It cannot be used for any other purpose. Note: In the interrupt program, all registers must be protected and the compiler will automatically protect the R4~r11*/intC_add (intAintb) { returnA +b;}intC_sub (intAintb) { returnA-b;} unsignedintASM_C_CTL_CP15 (void) {unsignedinti =0; uart_printf ("asm_c_ctl_cp15\n"); __asm {MRC P15,0, R0,C1,C0,0MOV I,r0}returni;}

"VC Debugging (TC or BC with TD debugging) when pressing Alt+8, Alt+6 and alt+5, open the Assembly window, Memory window and register window to see each c corresponding assembly, step into and observe the corresponding memory and register changes, so after all the understanding of everything.Alt+8 DisassemblyAlt+6 MemoryAlt+5 Registers(Linux or UNIX can be debugged with GDB, look at each c corresponding

,ip:0000h. The CPU reads the instruction execution from the memory 2000h*16+0000h.2. The contents of the Cs,ip are fed into the address adder, which is done by the address adder:Physical Address = Segment Address *16+ offset address3. The physical address is fed into the input-output control circuit by the address adder.4. The input/output control circuit sends the physical address 20000H to the address bus.5. The machine instructions stored from the memory 20000H unit are fed into the CPU via t

R command: View, modify the contents of registers in the CPUd command: View in-memory contentE command: Modify the contents of memory, can write data, instructions, in memory, they are not different in memoryU command: Interprets the contents of memory as machine instructions and corresponding assembly instructionsT command: Executes the instruction at the memory unit pointed to by the Cs:ip, CS is the code segment segment register, and IP is the inst

DS, in fact, the assembly language program in the assume narrative does not produce any program code, this function is to tell the assembler to do some necessary assumptions, To properly assemble the program. For example, the following procedures:CSEG segment.............Assume Ds:csegMOV Ah,radix.............Radix DB 16.............Cseg endsWhen the assembler sees MOV ah,radix this instruction, it generat

The meaning and function of PTR in assembly language MoV ax, BX; is to assign the value of the Bx register "in" to ax, because both are word type, so there is no need to add "word"MoV ax, word PTR [BX]; is the data stored in the place where the memory address is equal to the value of the Bx register, and is assigned to ax. Because we only provide a memory address and do not know whether it is byte or wor

Embedded Assembly macro function _ syscall0 for system calls defined in linux/include/unistd. h. In fact, it is not difficult to find that it is a function, but it is defined by a macro. The key is how to understand the syntax of _ asm _ volatile. For the fixed form of _ asm _ volatile, we temporarily ignore it (can refer to the http://blog.csdn.net/robbie1314/archive/2011/04/17/6329880.aspx), the key to understand the meaning in. The following is an

An assembly language program from writing out to the final execution of the brief process:write--〉 compile--〉 connection--〉 execute1. Writenotepad++ Select assemblyAssume Cs:abc; ABC is used by us as a code snippet, so to associate it with CS ABC segment; Define a segment (ABC), to ends end Start:mov ax,2; Give the program a starting position add ax,ax; Write the assemb