r5 m430

address* R5 = start of this image* R2 = end of malloc space (and therefore this image)* We basically want:* R4> = R2-> OK* R4 + image length */CMP R4, r2BHS wont_overwriteAdd r0, R4, #4096*1024 @ 4 MB largest kernel sizeCMP r0, R5BLS wont_overwrite MoV R5, R2 @ decompress after malloc SpaceMoV r0, R5MoV R3, r7BL decompress_kernel Add r0, R0, #127Bic r0, R0, #127 @ align the kernel Length/** R0 = decompress

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, # 'A' @ Yes, error 'A'Beq _ ErrorBL _ create_

Build our ndk development environment. This part contains a lot of online materials ~~~~ To do this, you must first sharpen the tool. The following describes how to build an integrated development environment for the eclipse SDK ndk cygwin CDT.1. Build an android Development Environment Setting up the android development environment is not a key point. I believe many people who have read this article have successfully set up the environment. Let's give a brief description here. 1) download JDK

the 0XD91B8 to read the memory at 0x97356 (R2+0X15DA), triggering the breakpoint. 0XD91B4 anti-Push can get R5 = 0x20 corresponds to the race of the tri-colored Bird 33, you can know here R5 save is the race ID, The data for this race ID should be read from the CDROM. We're not going to push anymore. . we are at 0xd91b8 and 0xd91a8 place the breakpoint to see. found that 0xd91a8 will not pass. Continue ste

Local-preferenceLocal Priority PropertyOnly exchanged between IBGP peers and not advertised to other asThe greater the priority, the higher the priority, the default is 100For multiple exits of the same as, go out of the waybelongs to any recognized attributeNote: The source route delivery direction + specified peer+ the direction (Import/export) that you want to pass in order to correctly apply the routing policy.650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M02/84/89/wKioL1eTYB3DW2H_A

.text:00003094 ADD R3, PC; _ztv4base_ptr.text:00003096 LDR R3, [R3]; ' vtable for ' base takes out the virtual table pointer of base, pointing to. data.rel.ro, i.e. 0x70428960.text:00003098 MOVS R4, R0; R0 is the first address of a memory unit of just 20 bytes allocated, and is now assigned to r4.text:0000309a ADDS R3, #8; R3+8 to r3,r3 points to 0x70428968.text:0000309c STR R3, [R0]; assigns 0x70428968 to the first address of the memory unit that was just allocated (the memory unit pointed to).

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

is somewhat abstract, and here's an example to explain it easily:Use:Arm-inux-objdump–d u-boot > Dump_u-boot.txt Copy Codecan get dump_u-boot.txt files. The file is the executable assembly code that contains the program in U-boot,In which we can see the C language function source code, in the end corresponds to those assembly code.The following is a two-function assembly code,One is Clock_init,The other is in the same C-source file as Clock_init, and another function Copycode2ram:33D0091C:33d00

= 000000a0 R02 = 08000100 R03 = 08008000R04 = 00000000 R05 = 08000124 R06 = 083dc0a9 R07 = 0841bc9cR08 = 083DBFDC R09 = 083E0260 R10 (SL) = 00000000 R11 (FP) = 00000002R12 (IP) = 083dbfc0 R13 (SP) = 083dbd44 R14 (LR) = 08413984 PC = 08008000CPSR = 600000d3 SPSR = b00000ff>bkm>di 0x08008000//disassemble the address area code08008000:mov r0,r008008004:mov r0,r008008008:mov r0,r00800800c:mov r0,r008008010:mov r0,r008008014:mov r0,r008008018:mov r0,r00800801c:mov r0,r008008020:b 0x800803008008024:.

abstract, and here is an example to illustrate briefly, it is easy to understand:Arm-inux-objdump–d u-boot > Dump_u-boot.txtYou can get the Dump_u-boot.txt file. The file is in, containing the executable assembly code of the program in U-boot, where we can see the source code of the C language function, which corresponds to those assembly code.The following is a compilation code of two functions,One is Clock_init,The other is not clock_init in the same C source file, and the other one is Copyco

650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M02/77/75/wKioL1ZoIcOTDBBOAAECfBygMsY426.jpg "title=" QQ picture 20151209204034.jpg "alt=" Wkiol1zoicotdbboaaecfbygmsy426.jpg "/>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/24Bridge connection1, configure the Ethernet address of the R1

|; | ____________________ |; | R6 |; | ____________________ |; | R5 |; | ____________________ |; | R4 |; | ____________________ |; | R3 |; | ____________________ |; | R2 |; | ____________________ |; | R1 |; | ____________________ |; | R0 |; | ____________________ |; | CPSR |; | ____________________ |; | Osentersum | ; | ____________________ |; |; | Idle space |; | ____________________ |; |;; Figure A Job stack structure ; | ____________________ | ; |

After early_init is executed in the previous article, the basic initialization work in the early stages of CPU startup is completed. Then the kernel starts to redirect and copy and run. The Code is as follows: Blreloc_offsetmrr26, r3addisr4, R3, kernelbase @ H/* Current address of _ start */lisr5, physical_start @ hcmplw0, R4, R5/* already running physical_start? */Bnerelocate_kernel/* Juan kernel redirection, required for classic startup */ Here, the

3. CPU Initialization The following code initializes the CPU. The functions are blocked by watchdog, the interrupt control register is initialized, the cache is cleared, and MMU is disabled. . Globlinit_e300_coreinit_e300_core:/* time T 10 * // * initialize machine status; Enable machine check interrupt */lir3, msr_kernel/* Set MSR, allow data \ command replication and machine check */rlwimir3, R5, 0, 25, 25/* preserve IP bit set by hrcw */# ifdef deb