00. 目錄

文章目錄

• • 00. 目錄
  • 01. ldr偽指令
  • 02. ldr指令
  • 03. adr指令
  • 04. str指令
  • 05. 附錄

01. ldr偽指令

ldr示例一:

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0@r0 = *(.L0)ldr r1, .L0bl printfmov r0, #0pop {pc}.L0:.word 0x11112222

執行結果

[root@itcast 3rd]# ./a.out val = 0x11112222 [root@itcast 3rd]#

ldr示例二:

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0ldr r1, .L0bl printfldr r0, =.LC0ldr r1, .L0 + 4bl printfldr r0, =.LC0ldr r1, .L0 + 8bl printfmov r0, #0pop {pc}.L0:.word 0x1111.word 0x2222.word 0x3333.word 0x4444.word 0x5555.word 0x6666.word 0x0

執行結果:

[root@itcast 3rd]# ./a.out val = 0x1111 val = 0x2222 val = 0x3333 [root@itcast 3rd]#

02. ldr指令

程序示例一:

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r4, =.L0 1:ldr r0, =.LC0@r1 = *(r4)ldr r1, [r4]cmp r1, #0beq 1fbl printfadd r4, #4b 1b1:mov r0, #0pop {pc}.L0:.word 0x1111.word 0x2222.word 0x3333.word 0x4444.word 0x5555.word 0x6666.word 0x0

程序示例二：

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r4, =.L0 1:ldr r0, =.LC0@r1 = *(r4); r4 = r4 + 4;ldr r1, [r4], #4cmp r1, #0beq 1fbl printfb 1b1:mov r0, #0pop {pc}.L0:.word 0x1111.word 0x2222.word 0x3333.word 0x4444.word 0x5555.word 0x6666.word 0x0

程序示例三：

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r4, =.L0mov r5, #0 1:ldr r0, =.LC0ldr r1, [r4, r5]cmp r1, #0beq 1fbl printfadd r5, r5, #4b 1b1:mov r0, #0pop {pc}.L0:.word 0x1111.word 0x2222.word 0x3333.word 0x4444.word 0x5555.word 0x6666.word 0x0

程序示例四：

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r4, =.L0mov r5, #0 1:ldr r0, =.LC0@ r1 = *(r4 + r5 << 2)ldr r1, [r4, r5, LSL #2]cmp r1, #0beq 1fbl printfadd r5, r5, #1b 1b1:mov r0, #0pop {pc}.L0:.word 0x1111.word 0x2222.word 0x3333.word 0x4444.word 0x5555.word 0x6666.word 0x0

程序示例五：

.section .rodata.align 2 .LC0:.string "val = %p\n".LC1:.string "ar[%d] = %p\n".section .text.align 2.global main main:push {lr}ldr r4, =.L0mov r5, #0 1:ldr r0, =.LC1ldr r2, [r4, r5, LSL #2]cmp r2, #0beq 1fmov r1, r5bl printfadd r5, r5, #1b 1b1:mov r0, #0pop {pc}.L0:.word 0x1111.word 0x2222.word 0x3333.word 0x4444.word 0x5555.word 0x6666.word 0x0

程序示例六：

.section .rodata.align 2 .LC0:.string "val = %p\n".LC1:.string "ar[%d] = %p\n".section .text.align 2.global main main:push {lr}ldr r4, =.L0mov r5, #0 1:ldr r0, =.LC1ldrh r2, [r4], #2cmp r2, #0beq 1fmov r1, r5bl printfadd r5, r5, #1b 1b1:mov r0, #0pop {pc}.L0:.word 0x11111111.word 0x22222222.word 0x33333333.word 0x44444444.word 0x55555555.word 0x66666666.word 0x0

執行結果

[root@itcast 3rd]# ./a.out ar[0] = 0x1111 ar[1] = 0x1111 ar[2] = 0x2222 ar[3] = 0x2222 ar[4] = 0x3333 ar[5] = 0x3333 ar[6] = 0x4444 ar[7] = 0x4444 ar[8] = 0x5555 ar[9] = 0x5555 ar[10] = 0x6666 ar[11] = 0x6666 [root@itcast 3rd]#

程序示例七：

.section .rodata.align 2 .LC0:.string "val = %p\n".LC1:.string "ar[%d] = %p\n".section .text.align 2.global main main:push {lr}ldr r4, =.L0mov r5, #0 1:ldr r0, =.LC1ldrb r2, [r4], #1cmp r2, #0beq 1fmov r1, r5bl printfadd r5, r5, #1b 1b1:mov r0, #0pop {pc}.L0:.word 0x11111111.word 0x22222222.word 0x33333333.word 0x44444444.word 0x55555555.word 0x66666666.word 0x0

程序示例八：

.section .rodata.align 2 .LC0:.string "val = %p \n".text.align 2.global main main:push {lr}ldr r0, =.LC0ldr r2, =.L1ldr r1, [r2, #-4095]bl printfmov r0, #0pop {pc} .L0:.word 0x11111111.word 0x22222222 .L1:.word 0x33333333.word 0x44444444.word 0x0

程序示例九：

.section .rodata.align 2 .LC0:.string "hello world\n".section .text.align 2.global main main:push {lr}@ldr r0, .L0@ldr r0, =.LC0ldr r0, [pc, #8]bl printfmov r0, #0pop {pc}.L0:.word .LC0

03. adr指令

程序示例

.section .rodata.align 2 .LC0:.string "hello world\n" .LC1:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC1adr r2, .L0ldr r1, [r2]bl printfmov r0, #0pop {pc}.L0:.word 0x11223344

04. str指令

程序示例一：

.section .rodata.align 2 .LC0:.string "hello world\n" .LC1:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r4, =.L0 1:ldr r0, =.LC1ldr r1, [r4], #4cmp r1, #0beq 1fbl printfb 1b1:ldr r4, =.L0mov r1, #1 1:str r1, [r4], #4add r1, #1cmp r1, #4ble 1bldr r4, =.L0 1:ldr r0, =.LC1ldr r1, [r4], #4cmp r1, #0beq 1fbl printfb 1b1:mov r0, #0pop {pc}.section .data.align 2.global .L0 .L0:.word 0x1111.word 0x2222.word 0x3333.word 0x4444.word 0x0

程序示例二：

.section .rodata.align 2 .LC0:.string "hello world\n" .LC1:.string "val = %p\n" .LC2:.string "ar[%d] = %d\n".section .text.align 2.global main main:push {lr}sub sp, sp, #16mov r1, #0 1:str r1, [sp], #4add r1, #1cmp r1, #4bne 1bmov r4, #0mov r5, #-4 1:mov r1, r4ldr r2, [sp, r5]ldr r0, =.LC2bl printfadd r4, #1sub r5, #4cmp r4, #4bne 1bmov r0, #0pop {pc}

程序示例三：

.section .rodata.align 2 .LC0:.string "hello world\n" .LC1:.string "val = %p\n" .LC2:.string "ar[%d] = %d\n".section .text.align 2.global main main:push {lr}sub sp, sp, #16mov r4, spmov r1, #0 1:str r1, [r4], #4add r1, #1cmp r1, #4bne 1bmov r4, #0 1:mov r1, r4ldr r2, [sp, r4, LSL #2]ldr r0, =.LC2bl printfadd r4, #1cmp r4, #4bne 1badd sp, sp, #16mov r0, #0pop {pc}

程序示例四：

.section .rodata.align 2 .LC0:.string "hello world\n" .LC1:.string "val = %p\n" .LC2:.string "ar[%d] = %d\n".section .text.align 2.global main main:push {lr}sub sp, sp, #16mov r4, spmov r1, #0 1:str r1, [r4], #4add r1, #1cmp r1, #4bne 1bmov r5, spmov r4, #0 1:mov r1, r4ldr r2, [sp, r4, LSL #2]ldr r0, =.LC2bl printfadd r4, #1cmp r4, #4bne 1badd sp, sp, #16mov r0, #0pop {pc}

程序示例五：

.section .rodata.align 2 .LC0:.string "hello world\n" .LC1:.string "val = %p\n" .LC2:.string "ar[%d] = %d\n".section .text.align 2.global main main:push {lr}sub sp, sp, #12mov r4, spmov r1, #0 1:strb r1, [r4], #1add r1, #1cmp r1, #12bne 1bmov r5, spmov r4, #0 1:mov r1, r4ldrb r2, [r5, r4]ldr r0, =.LC2bl printfadd r4, #1cmp r4, #12bne 1badd sp, sp, #12mov r0, #0pop {pc}

05. 附錄

8.1 【ARM】Load Store指令

總結

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