C language compilation, analysis under the arm architecture

.text
.global _start

_start:

    ldr sp, =4096  

    bl main

halt:
    b halt

int main()
{
    unsigned int *pGPFCON = (unsigned int *)0x56000050;
    unsigned int *pGPFDAT = (unsigned int *)0x56000054;


    *pGPFCON = 0x100;

    *pGPFDAT = 0;

    return 0;
}

LED. ELF:      File-littlearm the format ELF32 

the Disassembly of sectionTop. text: 

00000000 <_start>:
    0 : e3a0da01      MOV     SP, # 4096     ; 0x1000 // set the stack to 4096 
   . 4 : BL eb000000 C <main> // skip main function performing 

00000008 <HALT>:
    . 8 : B eafffffe     . 8 <HALT> 

0000000c <main>:
    C:     e1a0c00d      MOV     IP, // sp sp value to the assignment = IP 4096 
  10 : e92dd800 STMDB sp !, {FP, IP, LR , pc} // pc is R15 lr is R14 ip is R11 is R12 fp 
                                    value // first reduction sp 4, sp = 4092 and the value of pc into the memory referred to in 4096-4093 
                                    and then Save 4 // sp value 4088, then the value of lr placed 4092-4089 refers to memory 
                                    // sp value and then reduced to 4084 4, and then the value of ip into memory referred 4088-4085 
                                    @ 4 is then reduced sp value 4080, then the value of ip into 4083 to referred to memory 4080 
               // the above instruction is a need to be saved before calling main register 



                                                    
  14 : e24cb004      Sub     FP, IP, # . 4     ; 0x4 // IP-FP. 4 = 4092 =       
  18 is : e24dd008      Sub     SP, SP, # . 8     ; 0x8. 4 // = SP = SP-4072 
  
  . 1 C:     e3a03456      MOV    r3, # 1442840576     ; 0x56000000 0x56000000 into the // r3, 
  20 is : e2833050      the Add     r3, r3, # 80     ; 0x50 // add 80 to the value of r3 becomes 0x56000050 
  24 : e50b3010      STR     r3, [FP, # - 16 ] // 0x56000050 into the [ 4076 ] first local variables 
  
  28 : e3a03456      MOV     r3, # 1,442,840,576     ; 0x56000000 onto 0x56000000 // r3 in the 
  2 C:     e2833054      the Add     r3, r3, # 84     ; 0x54 // the value of r3 plus 84 becomes 0x56000054 
  30: E50b3014      STR      r3, [fp, # -20 is ] // 0x56000050 into the [ 4072 ] second local variables 
   
  34 is : e51b2010 LDR r2, [FP, # - 16 ] // to memory [ 4076 Value] 0x56000050 go into r2
   38 is : e3a03c01      MOV     R3, # 256     ; 0x100             
  . 3 C:     e5823000      STR     R3, [R2] // write the 0x100 [0x56000050] to memory 
  
  40 : e51b2014 LDR R2, [FP, # - 20 is ] // to memory [ 4072 ] r2 value 0x56000054 go into
   44 is : e3a03000      MOV    R3, # 0     ;0x0                 
  48 : e5823000      STR     R3, [R2] // write the 0x0 [0x56000054] to memory 
  
  . 4 C:     e3a03000      MOV     R3, # 0     ; 0x0                   
  50 : e1a00003      MOV     r0 of, R3 
  
  54 is : e24bd00c      Sub     SP, FP, # 12 is     ; 0xc // FP-12 is SP = 4092-12 = 4080 = 
  58 : LDMIA e89da800 SP, {fp, SP, PC} // first value in the memory 4080 to 4083 to fp, and a memory 4084 to 4087 SP, SP = 4096 
                                                      // Finally, the 4088-4091 value to the pc, which is the main function call finished,
                                                      // the address of the next instruction after there lr register before calling 
                                                     
  
  
the Disassembly of sectionTop. Comment: 

00000000 <.comment>:
    0 :     43.4347 million      cmpmi R3, # 0     ; 0x0 
   . 4 : 47282 03A      undefined
    . 8 : 2 029554e      eorcs R5, R9 , LR, ASR # 10 
   C:     2e342e33 mrccs     14 , . 1 , R2, CR4, CR3, { . 1 }
   10 : the Address 0x10 IS OUT of bounds.