r7 m445

PC: [ 1. Locating code crashes in the kernel or Xxx.ko Cat/proc/kallsyms >1.txt c0034818 T __kmalloc ... C00082A8 T quiet_kernel/* The first is the virtual address * * ... bf000000 T $a [CDD] .. This can see code crashes in Xxx.ko 2. Locate the function of the crash in Xxx.ko arm-linux-objdump-d Cdd.ko >2.txt 00000000 Compile Address +0xbf000000 = store Address 0000009c 9C:E1A0C00D mov ip,sp A0:E92DD8F0 Push {R4,R5,R6,R7,FP,IP,

personal concepts, now described below. Quantitative compression, for example:　 Conversion of 24bit RGB888-> 16bit RGB56524IBT RGB888 R7 R6 R5 R4 R3 R2 R1 R0 G7 G6 G5 G4 G3 G2 G1 G0 B7 B6 B5 B4 B3 B2 B1 B016bit RGB656 R7 R6 R5 R4 R3 G7 G6 G5 G4 G3 G2 B7 B6 B5 B4 B3Quantization digits from 8bit to 5bit or 6bit, take the high position of the original 8bit, the quantization of compression, but the loss of pr

CORTEX-M3 has universal register R0-R15 and some special function registers. R0-r12 is the most "common purpose", the vast majority of 16-bit instructions can only use R0-R7, while the 32-bit Thumb-2 instruction has access to all the universal registers. Special function registers must be accessed through a dedicated instruction.Universal Purpose Register R0-R7R0-R7 is called a low group register. All instr

RGB24 Mutual Turn RGB565 width and height are the height and width of the image Conversion of 24bit RGB888-> 16bit RGB565 24IBT RGB888 R7 R6 R5 R4 R3 R2 R1 R0 G7 G6 G5 G4 G3 G2 G1 g0b7 B6 B5 B4 B3 B2 B1 B0 16bit RGB565 R7 R6 R5 R4 R3 G7 G6 G5 G4 G3 g2b7 B6 B5 B4 B3 Rgb24 = (unsignedchar*) malloc (width*3);Rgb16 = (unsigned short*) malloc (width*height*2);static void rgb24_to_rgb565 (__u8 *rgb24, __u8 *rgb1

Warm tips: 1, OPPO R9 adopt and or Cato design, the slot is located on the right side of the fuselage, take out the card slot need to use the box with the Kari out, before installing SIM card. 2. The OPPO R9 is designed with a single card slot dual SIM card, two can be inserted into the Nano (mini card), which is consistent with R7 Plus, while R7 and r7s are micro SIM card +nano SIM card combinatio

"Print Call stack"(GDB) bt #0 epoll_wait () at bionic/libc/arch-arm/syscalls/epoll_wait. S:10 #1 0x401275ea in Android::looper::p ollinner ([emailprotected]=0x747fd3f0, timeoutmillis="Switch to the nth layer of the call stack"(GDB) F-one #11 0x41587ff6 in dalvik_java_lang_reflect_method_invokenative (args="Show assembly Code" (GDB) disassemble Dump of assembler code for function dalvik_java_lang_reflect_method_invokenative (U4 const*, jvalue*): 0x41587f7c "View Current Register Value"(GDB) In

, respectively.Example: ADD r0, r1, r2; r0 = r1 + r2RSB r0, r1, r2; r0 = r2-r1Logical operations by bit: AND, ORR, EOR, BICNote: bitwise and, bitwise OR, bitwise OR, and notExample: BIC r0, r1, r2; r0 = r1 and not r2Register transfer operation: MOV, MVNNote: MVN is a bitwise reverse transfer.Example: MVN r0, r2; r0 = not r2Comparison: CMP, CEN, TST, TEQNote: comparison, reverse comparison, bit test, and test are equalExample: TEQ r1, r2;Note: The sequential format of operands is the result regis

is the next eclipse comes with, but also basic is the latest (before using the Luna version, unfortunately halfway I thought it was ADT problem compiled, and replaced by Juno version, R9 also replaced R10, should not hinder), the NDK with the latest R10 .(Here I do not dare to mess to ensure that the JDK replaced 8, Android under W, L line not, I only use my own experience, I use the above version, can be equipped with the environment I want, you want to use the new NDK, you try, do not dare to

After the NAND is all formatted today, re-use the uboot in nor to burn the uboot into the NAND. It should be the same as the uboot interface in nor. The following message is prompted: #### embedsky BIOS for sky2440/tq2440 ##### Press space key to download mode! Booting LINUX... Copy Linux kernel from 0x00200000 to 0x30008000, size = 0x00200000... Copy Kern El to SDRAM done, warning: This binary is not compressed Linux kernel Image Zimage magic = 0 xffffffff Now, booting LINUX ...... Undefined in

First download cygwin and ndk (I'm using a android-ndk-r7) When downloading cygwin, You need to select what we want. If you do not know, we recommend that you install it all at the cost. The current ndk version does not need to be installed, saving the installation step. After cygwin is installed and ndk is downloaded 1. Configure the ndk environment variable in cygwin (C: \ cygwin \ home \ Administrator \. bash_profile). This is my directory. Fi

R4 9 R1- 9 R1- 10 Gnd 10 R5 10 R1 + 10 R1 + 11 De 11 R6 11 R2- 11 R2- 12 Gnd 12 R7 12 R2 + 12 R2 + 13 R0 13 Gnd 13 Gnd 13 Gnd

are completed with an AT command (ultrasn0w) We only need one command to unlock it !! The following information comes from the Wiki maintained by the great gods (http://theiphonewiki.com/wiki/index.php) (If you are good at English, you can browse it by yourself (you need to flip the wall). I will explain it in detail later) 4.26.08: At + xlog = 1, "dddddddddddddddddddddddddddddddd44445555pppp" D. Fill in the data to overwrite the stack of the baseband program and overwrite the following regist

parametersVoid sub (int A, int B, int C, int D, int e) {// R3 = [FP + 0x14]; // R7 = [FP + 0x18]; // [FP + 0x18] = R7; // [FP + 0x14] = R3; // [FP + 0x10] = R2; // [FP + 0xc] = R1; // [FP + 0x8] = R0;} void func (void) {sub (1, 2, 3, 4, 5); // p1 = 5; // [SP + 0x10] = p1; // p1 = 4; // [SP + 0xc] = p1; // r2 = 3; // R1 = 2; // R0 = 1; // call sub;} the preceding Code shows that, vdsp writes parameters from

an application * is linking when the main () function is in a static library (. a) * We can be sure that main () actually gets linked in */. type _ main, stt_func; _ start:/* clear the frame pointer and the L registers. */FP = 0; L0 = 0; L1 = 0; L2 = 0; l3 = 0;/* l Oad register r1 (argc) from the stack to its final resting place */P0 = sp; R1 = [P0 ++]; /* Copy argv pointer into R2 -- which its final resting place */r2 = P0; SP + =-28; R7 = 0;/* pass

2.6.20 kernel compiled by the arm-gcc-3.4.1:(Reference http://oskfordummies.hp.infoseek.co.jp/faq.html#i5)--------------------------------------------------In header. sMoV R7, # (mach_type_omap_osk 0xf)It should beMoV R7, # (mach_type_omap_osk ~ 0xf)--------------------------------------------------To solve the problem of "no response to the kernel after decompression", which is invalid! 3. On the basis o

. Difference between thumb Instruction Set and arm Instruction Set The thumb instruction set does not contain coprocessor instructions, semaphore commands, and instructions for accessing CPSR or spsr. It does not have multiplication instructions or 64-bit multiplication instructions, and the second operand of commands is limited; except for the conditional execution function of redirect command B, all other commands are executed unconditionally. Most thumb data processing commands use the 2-

common problems encountered during ndk Compilation Q:Android ndk: Host 'awk' tool is outdated. Please define host_awk to point to gawk or nawk!A:The main reason is that the/android-ndk-r7/prebuilt/linux-x86/bin/awk under the ndk directory is a 64-bit version. Here we can copy the awk in a 32-bit System (My Ubuntu is gawk) to/android-ndk-r7/prebuilt/linux-x86/bin/directory underReference URL: Http://stackov

initUnable to handle kernel Null Pointer Dereference at virtual address 000000e0PGD = c0004000[000000e0] * PGD = 00000000Internal error: Oops: 805 [#1]Modules linked in:CPU: 0PC is at usb_gadget_register_driver + 0x7c/0x108LR is at 0x1PC: [SP: c028bf78 IP: 60000093 FP: c028bf94R10: 00000000 R9: 00000000 reight: 00000000R7: c00197e8 R6: 2017001c R5: 00000000 R4: c020d7f8R3: c01424f8 R2: c020d818 r1: 00000b7c R0: c01d1300Flags: nzcv irqs on fiqs on mode svc_32 segment KernelControl: 53 17f table:

:DEF:ENTRY_BUS_WIDTH[ ENTRY_BUS_WIDTH=32bChangeBigEndian ;DCD 0xea000007][ ENTRY_BUS_WIDTH=16andeqr14,r7,r0,lsl #20 ;DCD 0x0007ea00][ ENTRY_BUS_WIDTH=8streqr0,[r0,-r10,ror #1] ;DCD 0x070000ea]|bResetHandler]bHandlerUndef;handler for Undefined modebHandlerSWI;handler for SWI interruptbHandlerPabort;handler for PAbortbHandlerDabort;handler for DAbortb.;reservedbHandlerIRQ;handler for IRQ interruptbHandlerFIQ;handler for FIQ interrupt;@0x20bEnterP

this operation, an undefined command exception is interrupted. Command syntax: MCR {cond} coproc, opcode1, RD, CRN, CRM {, opcode2} The Name Of The coprocesser for coproc command operation, standard name: PN, n is 0 ~ 15, here the source ARM Processor register CRN for the P15 opcode1 coprocessor specific opcode RD stores the first operand coprocessor register CRM stores the second operand coprocessor register opcode2 optional coprocessor operation code command example: the MCR P6, 2,