Arm common assembly instructions

1、 Commonly used instructions

（1）LDR、STR、MOV

LDR R0,[R1]  #R0 = *R1, Read R1 Points to the contents of the memory area , Deposit in R0
STR R0,[R1]  #*R1 = R0, take R0 write in R1 Point to memory area 
MOV R0,R1    #R0 = R1
MOV R0,#0X10 #R0 = 0x10
LDR R0,=0X12345678 #R0 = 0x12345678    # If there is no equal sign, it will 0x12345678 The value pointing to memory is taken out and put into R0
     Pseudo instruction , All instructions are 32 position , but MOV You can't do it all at once 32 The value of a , Because it has several bits to represent registers and instructions 

（2）add、sub

add r0,r1,#4 #r0=r1+4
sub r0,r1,#4 #r0=r1-4
sub r0,r1,r2 #r0=r1-r2

（3）B、bl

B           # An unconditional jump order 
bl main     # Jump to main, And save the address of the next instruction in lr In the register 

（4）ldmia、stmdb

// The stack is stored down from the high address 
ldmia sp,{fp,sp,pc}
    1.ldm Read memory for ,m by many
    2. There is a high value in the memory number register , It has nothing to do with the order written later 
    3.ia by increase after, That is, read first and then add 
stmdb sp!,{sp,ip,lr,pc}
    1.db by decrease before, That is, reduce first and then deposit 
    2. Exclamation mark indicates SP Equal to the final modified SP value 

（5）MRS、MSR

MRS:  Transfer the contents of the program status register to the general register .MRS <Rd>,CPSR/SPSR
MSR:  Transfers the contents of the operands to a specific field in the program status register .MSR CPSR/SPSR,<Rd>
    MRC and MCR similar .

（6）teq、cmp

teq： Test register and register / Whether the immediate values are equal , If equal set CPSR The median condition is 1
    teq r0, r1           
    ADDeq  R0, R0, #1;  # if R0 == R1, eq It's true , be R1=R1 + 1
cmp： Compare the size of two operands 
    CMP  R0, R1;
    ADDHI R0, R0, #1;  # if R0>R1,HI It's true , be R0=R0+1
    ADDLS R1, R1, #1;  # if R0<=R1,LS It's true , be R1=R1+1

（7）adr Instructions ： Calculate the relative offset , The front and back addressing space is 4K

start:MOV r0,#10
ADR  r4,start     # Equivalent to SUB r4,pc,#0xc, Because of the current pc Value for this instruction +8 , therefore -0xc

2、 Other  

ADC   Add instruction with carry 
ADD  Add instruction 
AND   Logic and instruction 
B     Jump instruction 
BIC   Bit clear instruction 
BL    Jump instruction with return 
BX    Jump instructions with state switching , The lowest is 1 when , perform Thumb Instructions , by 0 when , perform ARM Command execution 
BLX   Jump instructions with return and state switching 
CDP   Coprocessor data operation instructions 
CMN   Compare inverse instructions 
CMP  Comparison instruction 
EOR  XOR instruction 
LDC  Data transfer instructions from memory to coprocessor 
LDM  Load multiple register instructions 
LDR  Memory to register data transfer instructions 
MCR  from ARM Register to coprocessor register data transfer instructions 
MLA  Multiply and add instructions 
MOV  Data transfer instructions 
MRC  From coprocessor registers to ARM Register data transfer instructions 
MRS  delivery CPSR or SPSR Content to general register instruction 
MSR  Transfer general registers to CPSR or SPSR Instructions 
MUL 32 Bit multiplication instructions 
MLA 32 Bit multiply plus command 
MVN  Reverse data transfer instruction 
ORR  Logic or instruction 
RSB  Reverse subtraction instruction 
RSC  Reverse subtraction with borrow 
SBC  With borrow subtraction instructions 
STC  Coprocessor registers write memory instructions 
STM  Bulk memory word write instructions 
STR  Register to memory data transfer instruction 
SUB  Subtraction instructions 
SWI  Software interrupt command 
SWP  Exchange instructions 
TEQ  Equality test instructions 
TST  Bit test instructions 
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 Condition code    Mnemonic suffix      sign               meaning 
0000       EQ       Z Set up               equal 
0001       NE       Z Zero clearing               It's not equal 
0010       CS       C Set up               The unsigned number is greater than or equal to 
0011       CC       C Zero clearing               The unsigned number is less than 
0100       MI       N Set up               negative 
0101       PL       N Zero clearing               A positive number or zero 
0110       VS       V Set up               overflow 
0111       VC       V Zero clearing               No overflow 
1000       HI       C Set up Z Zero clearing          The unsigned number is greater than 
1001       LS       C Zero clearing Z Set up          The unsigned number is less than or equal to 
1010       GE       N be equal to V             The signed number is greater than or equal to 
1011       LT       N It's not equal to V           The signed number is less than 
1100       GT       Z Clear and [N be equal to V]    There are signs greater than 
1101       LE       Z Set or [N It's not equal to V]  The signed number is less than or equal to 
1110       AL        Ignore                Unconditional execution