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(Liblog).Second, the implementation of the NDK instance:For the development of the NDK under the Windows environment, if the NDK used was a prior version of R7, it was necessary to install Cygwin in order to use the NDK, so the builder needed to be configured for Eclipse was actually executing cygwin and then passing ndk-build as the parameter. At the beginning of NDKr7, Google's Windows version of the NDK provides a ndk-build.cmd script so that it c
number. MoV R5, A; R5 store the 1st number. INC dptr Movx A, @ dptr MoV R6, A; R6 store 2rd number. MoV r0, A; store the second byte in R0 for later use. MoV A, R2; 2*2 *... * 2 (R2 2)-1 MoV R7, Lcall power2; power2 is the Npower of 2. N is passed in from R7. The implementation of the power2 function is very simple and is not listed here. CLR C Subb A, #01 H; 2*2 *... * 2-1: 2's R2 power minus one, 2exp
0x20000100 of the kernel. In this way, the parameter linked list is created. 4. kernel receiving ParametersThe following describes how the Linux kernel receives the kernel parameters passed by bootloader from the zimage Image Based on the ARM architecture, In the file ARCH/ARM/boot/compressed/head. S, start is the starting point of zimage. Some code is as follows:Start:MoV R7, r1MoV R8, r2......MoV r0, r4MoV R3, r7BL decompress_kernelB call_kernelCal
way.** R4 = kernel execution address* R7 = architecture ID*/Wont_overwrite: mov r0, r4MoV R3, r7BL decompress_kernelB call_kernel...Call_kernel: BL cache_clean_flushBL cache_offMoV r0, #0 @ must be zeroMoV R1, R7 @ restore architecture numberMoV R2, R8 @ restore atags pointerMoV PC, R4 @ call Kernel----------------------------------------------------------------The decompress_kernel function is implemented
From the Internet found a neon command optimization yuv420 to rgb24 code, in the cortex-A8 architecture, clock speed 1g CPU for a frame of qcif (176x144) data test, in addition, compared with the popular algorithm written in C on the Internet, it is found that the speed of the former is more than 700 times that of the latter: the former uses 1000 ms for 112 cycles, and the latter uses 88645 Ms. The related code is as follows: Assembly Code Area |. text |, code, readonly; name this block of code
about MMU, see ARM architecture and programming.To the head-armv.s find the entry to the program. Section ". Text. init", # alloc, # execinstr. Type stext, # FunctionEntry (stext)MoV R12, R0MoV r0, # f_bit | I _bit | mode_svc @ Make sure SVC ModeMSR cpsr_c, R0 @ and all irqs disabledBL _ lookup_processor_typeTEQ R10, #0 @ invalid processor?Moveq r0, # 'P' @ Yes, error 'P'Beq _ ErrorBL _ lookup_ubunture_typeTEQ R7, #0 @ invalid architecture?Moveq r0,
How many registers does the ARM processor contain? What registers are available in each mode? What are the functions of these registers? Let's learn about arm registers with these questions! I believe you will gain some benefits after reading this article.The ARM processor has 37 registers.It contains 31 General registers and 6 State registers. ========================================================== ========================================================== ========USR System Supervisor abort
(INT R3 = 0; R3 {If (check (R3, 3 )){Arr [R3] [3] = 1;For (INT r4 = 0; R4 {If (check (R4, 4 )){Arr [R4] [4] = 1;For (INT R5 = 0; R5 {If (check (R5, 5 )){Arr [R5] [5] = 1;For (INT R6 = 0; R6 {If (check (R6, 6 )){Arr [R6] [6] = 1;For (INT R7 = 0; R7 {If (check (R7, 7 )){Arr [R7] [7] = 1;Display ();Cout }Arr [
of dynamic debugging experiments, it is found that the Android Application will call the pthread_create function to create a thread for reverse debugging. Therefore, the method to crack a breakpoint under the Java_com_yaotong_crackme_MainActivity_securityCheck function cannot be achieved directly. Therefore, the code of the App is modified to prevent anti-debugging of the App ., Locate the location of the ARM assembly command BLX R7 at A8CE 9C58 in
. After several rounds of dynamic debugging experiments, it is found that the Android Application will call the pthread_create function to create a thread for reverse debugging. Therefore, the method to crack a breakpoint under the Java_com_yaotong_crackme_MainActivity_securityCheck function cannot be achieved directly. Therefore, the code of the App is modified to prevent anti-debugging of the App ., Locate the location of the ARM assembly command BLX R7
others from using their app for dynamic debugging. After several rounds of dynamic debugging experiments, it was found that the Android application would call the function pthread_create to create the thread to reverse debug. Therefore, directly in the function java_com_yaotong_crackme_mainactivity_securitycheck at the breakpoint implementation of the method can not be directly achieved. Therefore, in order to prevent the anti-debugging of the app, the code of the program is modified. , locate
address, R5 is the kernel file of the beginning of the address. Check to see if the address is conflicting. The R5 equals R2 so that the decompress kernel address is after the 64K stack. (9) the function Decompress_kernel () that calls the file misc.c, extracts the kernel at the end of the cache (R2 address). At this point the Register values change as follows: R0 is the size of the kernel after decompression R4 is the address when kernel is executed R5 is the starting address for kernel after
dual 4G and full Netcom version, supporting dual SIM, running the Nubia UI 3.0 user interface based on Android 5.1 depth customization, the overall configuration belongs to the middle-end mainstream level. Popular women's phones recommended: OPPO R7Reference Price: 2499 RMBRecommended reasons: Fast charging, fashion photography machine OPPO R7 is a flagship fashion photography machine, but also a last month's May 20 just released a n
register (R15) while CPU is runningJlink Error:can not read register (XPSR) while CPU is runningJlink error:can Not read register 0 (R0) while CPU is runningJlink Error:can Not read Register 1 (R1) while CPU is runningJlink Error:can Not read Register 2 (R2) while CPU is runningJlink Error:can Not read Register 3 (R3) while CPU is runningJlink Error:can Not read Register 4 (R4) while CPU is runningJlink Error:can Not read Register 5 (R5) while CPU is runningJlink Error:can Not read register 6 (
word, the recovery scene, exception handling returns, ^ indicates that the user mode is not allowed 10.STM passes a value from the Register list to the storage space. Stmia R1!,{R3-R9}; Stores the R3-R9 data to the address that R1 points to, and the R1 value is updated. STMFD SP!,{R0-R7,LR}; Save in the field and R0~R7,LR into the stack 11.ASR (arithmetic right shift), ROR (loop right S
In single-chip microcomputer often used to 16 (2) into the BCD code, although the C language programming is more convenient, but the assembly is often needed Here is a 24-bit binary to the BCD code for example, where the BCD code is stored in a compressed manner, that is, 4-bit storage of a /* Ingress parameter R1,R2,R3 holds 24-bit binary number, r1-bit maximum 8-bit exit parameter R4,R5,R6,R7 */mov R4, #0 mov R5, #0 mov R6, #0 mov
GTX Titan Mid-end RX 480 R9 390 R9 290X GTX 780 GTX 970 GTX1050 Ti R9 290 GTX1050 RX470 R9 380X R9 380 R9 280X GTX 760 GTX 960 R9 285 R9 370X R9 280 R9 270X GTX 950 R7
and HQ heterogeneous queue technology, so that the CPU and GPU in equal working relationship, equality has the same priority. HSA asynchronous architecture gives CPU and GPU equal processing priority In fact, on the mobile version, in addition to A6, in the CPU Processor Core Extreme edition of the 4 CPU core design, and the promotion of the "10 core" concept is actually included the same priority GPU core, the core number of Cpu+gpu core is called "Operation Core", This naming is
specified when putInserting dataInsert the name below without specifying columnPut ' t1 ', ' R1 ', ' F1 ', ' v1 'Put ' T1 ', ' R2 ', ' F2 ', ' v2 'Put ' T1 ', ' R3 ', ' F3 ', ' V3 'Insert the name of the specified column belowPut ' t1 ', ' R4 ', ' f1:c1 ', ' v1 'Put ' T1 ', ' R5 ', ' f2:c2 ', ' v2 'Put ' T1 ', ' R6 ', ' f3:c3 ', ' v3 'HBase (main):245:0> scan ' T1 'ROW Column+cellR1 COLUMN=F1:, timestamp=1335407967324, VALUE=V1R2 COLUMN=F2:, timestamp=1335408004559, Value=v2R4 column=f1:c1, tim
A friend previously made a website, but was worried about someone copying the content and source code of his website. He asked how to prevent others from viewing the source code of his website? (Who would like to watch his website ...... It's a joke.) generally, some methods can be implemented to prevent others from viewing the source code of the webpage. below, let's simply analyze the torch points for everyone. If we want to prevent others from view
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