must be put into the stack. After test_c_args is called, The LR saved in the stack is written back to the PC, in this way, it can be returned to the main function.What if test_c_args has eight parameters? In this case, how should we PASS Parameters in test_asm_args?Instance 2:Test_asm_args.asm//--------------------------------------------------------------------------------Import test_c_args; declare the test_c_args FunctionArea test_asm, code, readonlyExport test_asm_argsTest_asm_argsStr lr, [
];//generate bit code for 2nd bitintR4;if(R3 = = 10) {R4= Random.nextint (15) + 1;//generate random numbers from 1 to 16}Else if(R3 = = 15) {R4= Random.nextint (15);//generate random numbers from 0 to 15}Else{R4= Random.nextint (16);//generate random numbers from 0 to 16}string STR_R4=RBASE[R4]; System.out.println (Str
COST value 1. Topology: 2. Configuration and Description: 1. Configure the IP address and ospf protocol of each interface. I used an R0 router to configure a frame relay switch. This helps us better understand frame relay. Note: When R1 and R4 use the FR interface, you can define the interface type ip ospf network broadcast or manually specify the neighbors of the two interfaces. Otherwise, the neighbors may fail. 2. Then we can manually specify the c
address of the "/system/bin/sh" string, and then call the system () function to achieve our goal.
How to find the gadgets? Although ida or objdump can be used for search, it is time-consuming and laborious. Here I recommend ROPGadget. Because level7 is compiled into the thumb command by default, we also use the thumb mode to find the gadgets:
#!bash$ ROPgadget --binary=./level7 --thumb | grep "ldr r0"0x00008618 : add r0, pc ; b #0x862e ; ldr r0, [pc, #0x10] ; add r0, pc ; ldr r0, [r0] ; b #0x86
assembly file or a segment does not mean that the execution is complete first.Head. s to execute head-s3c2410.s, or pay attention to the link segment, apparently head. sIn a short time, another segment is started. Text.. TextADR r0, lc0Ldmia r0, {R1, R2, R3, R4, R5, R6, IP, SP}Subs r0, R0, R1 @ calculate the Delta offsetAnd our head-s3c2410.s?. Section ". Start", # alloc, # execinstr_ S3c2410_start:Bic R2, PC, # 0x1fAdd R3, R2, #0X4000 @ 16 KB is qui
0x2a0010e8 :;
Instruction: 0xffffff48
0x2a0010ec :;
Instruction: 0xffffff4c
0x2a0010f0: push {r11, lr}
0x2a0010f4: add r11, sp, #4
(Gdb) B * 0x2a0010d8
Breakpoint 2 at 0x2a0010d8
(Gdb) c
Continuing.
Breakpoint 2, 0x2a0010d8 in ?? ()
(Gdb) p/x $ r2 // view the main function address
$1 = 0x2a0017c9
(Gdb) B * 0x2a0017c9 // The main function breakpoint, now libc. so has been loaded, you can also B open/fputs/ex
is preferred. When there are multiple shortest paths, it is preferred to learn from the larger area ID. 3. If FA is not 0, the shortest path of the FA address metric is preferred.In this figure, R4 and R1 are in Area 0, R1 learns to external routes through RIP redistribution, and R2 and R3 both run RIP. The intermediate switch is used to simulate a bus network. R1 E0/1 and R2 R3 E0/0 are all in the same network segment. The configuration of
creation process. After the neighbor is established, R1 can learn the routes of R2 and R3. 4) scenario 3: R1 and R2 are area0 and R4 are area1, r1 and R4 have the same routerID [R1] ospf1 rof1-id 1.1.1.1 area 0.0.0.0 network 10.1.1.1 0.0.0.0 network 10.1.12.1 0.0.0.0 network 255.0.0.0.0 [R2] ospf1 router-id 2.2.2.2 area 0.0.0.0 network 10.1.12.2 0.0.0.0 10.1.2.2 0.0.0.0 area 0.0.0.1 network 10.1.24.2 0.0.0
Recursive routing of Advanced Static Routing (III)Recursive query of routes is unnecessary for static routes. The purpose of recursive routing is to bypass frequently changing links and reduce the configuration workload of Static Routing. I. Experiment topology II. Experiment description 1. If R1 wants to communicate with R4, R1 must have a static route to R4. If it is a simple topology, several static rout
Tool used in the experiment: Xiao fan Simulator
1. On router R1, configure the interface, start the ospf routing process and rip, advertise the network segment, and configure route redistribution.★☆R1 ☆★☆→Router>Router> enableRouter # config terminalRouter (config) # hostname R1-jinR1-jin (config) # interface loopback 0R1-jin (config-if) # ip address 1.1.1.1 255.255.255.255R1-jin (config-if) # interface f0/0R1-jin (config-if) # ip address 10.0.0.1 255.0.0.0R1-jin (config-if) # no shutdownR1-jin
650) this.width=650; "src=" Http://s4.51cto.com/wyfs02/M02/77/A8/wKioL1ZqrkujOgEPAACGyTYrjpU740.png "title=" QQ picture 20151211190632.png "alt=" Wkiol1zqrkujogepaacgytyrjpu740.png "/>One, address description1,R1--R5 all want a loopback0=10.10.x.x2, R1--R3 E0 address =1.1.123.x3, the R2--r4 WAN interface is 1.1.234.X/244,r4-r5 WAN Interface =1.1.45.x/24Two, bridgingConfiguring the R1-R3 Ethernet AddressConf
Os_schednew directly, because at this time the system is no task in the execution, there is no interruption lock, so it is important to note that before the system starts, it is best to leave only the system interruption, start and then open the interrupt, otherwise it may cause problemsThen still get the priority, get the TCB, and finally call the Osstarthighrdy function according to the current highest priority task, the function is a function that requires assembly language porting, in Os_cp
frame pointer to the value of the stack pointer (SP)–push the preserved registers to the stack–make Space for local storageA example might look like this:Push {R4-R7, LR}//Save LR, R7, R4-r6add R7, SP, #12//adjust R7 to point to saved R7push {r8, R10, R11}// Save remaining GPRs (R8, R10, R11) Vstmdb sp!, {d8-d15}//Save vfp/advanced SIMD Registers d8sub sp, SP, #36//AL Locate space for local
://ftp.ntu.edu.tw, (you can also add a site, in the user URL to enter the site of your choice, and then click Add, add in the list selected site) and then click Next: A list of component packages to download will appear: Click Next to proceed to the installation process: Click Finish to complete the installation.Let's test if the Cygwin is already installed:Run Cygwin, in the popup command line window input: Cygcheck-c Cygwin command, will print out the current Cygwin version and running state,
there is a higher priority function to use R0, then the value of R0 pushed to the stack, and so R0 by the higher priority function after the use of the pop from the stack before the value. The stack is typically manipulated when the function is called.The command for the stack operation is push and pop, usually in pairs, and at the beginning of the function, the value in the register to be used when the function is executed is pushed into the stack, and then at the end of the function the value
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