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?1、arm汇编源码文件 hello64.s
.data
/* Data segment: define our message string and calculate its length. */
msg:
.ascii "Hello, ARM64! Written by AppNinja.\n"
len = . - msg
.text
/* Our application's entry point. */
.globl _start
_start:
/* syscall write(int fd, const void *buf, size_t count) */
mov x0, x0
mov x1, x1
add x0, x0,#0
add x0, x0,#1
cmp x0, #0
cmp x0, #1
cmp x0, x1
mov x0, #1 /* fd := STDOUT_FILENO */
ldr x1, =msg /* buf := msg */
ldr x2, =len /* count := len */
mov w8, #64 /* write is syscall #64 */
svc #0 /* invoke syscall */
/* syscall exit(int status) */
mov x0, #0 /* status := 0 */
mov w8, #93 /* exit is syscall #93 */
svc #0 /* invoke syscall */
2、编译
进入ndk工具链目录：
AppData\Local\Android\Sdk\ndk\21.0.6113669\toolchains\aarch64-linux-android4.9\prebuilt\windows-x86_64\aarch64-linux-android\bin
依次执行编译链接执行，批处理脚本如下：
as -o hello.o hello.s
ld -s -o hello hello.o
adb push hello /data/local/tmp
adb shell "chmod 777 /data/local/tmp/hello"
adb shell "ls -la /data/local/tmp/hello"
adb shell "/data/local/tmp/hello"
pause
Output:
Hello, ARM64! Written by AppNinja.
3、反编译代码
LOAD:0000000000400000 ; Segment type: Pure code
LOAD:0000000000400000 AREA LOAD, CODE, ALIGN=0
LOAD:0000000000400000 ; ORG 0x400000
LOAD:0000000000400000 CODE64
LOAD:0000000000400000 7F 45 4C 46 dword_400000 DCD 0x464C457F ; DATA XREF: LOAD:0000000000400050↓o
LOAD:0000000000400000 ; File format: \x7FELF
LOAD:0000000000400004 02 DCB 2 ; File class: 64-bit
LOAD:0000000000400005 01 DCB 1 ; Data encoding: little-endian
LOAD:0000000000400006 01 DCB 1 ; File version
LOAD:0000000000400007 00 DCB 0 ; OS/ABI: UNIX System V ABI
LOAD:0000000000400008 00 DCB 0 ; ABI Version
LOAD:0000000000400009 00 00 00 00 00 00 00 DCB 0, 0, 0, 0, 0, 0, 0 ; Padding
LOAD:0000000000400010 02 00 DCW 2 ; File type: Executable
LOAD:0000000000400012 B7 00 DCW 0xB7 ; Machine: ARM64
LOAD:0000000000400014 01 00 00 00 DCD 1 ; File version
LOAD:0000000000400018 B0 00 40 00 00 00 00 00 DCQ start ; Entry point
LOAD:0000000000400020 40 00 00 00 00 00 00 00 DCQ 0x40 ; PHT file offset
LOAD:0000000000400028 40 01 00 00 00 00 00 00 DCQ 0x140 ; SHT file offset
LOAD:0000000000400030 00 00 00 00 DCD 0 ; Processor-specific flags
LOAD:0000000000400034 40 00 DCW 0x40 ; ELF header size
LOAD:0000000000400036 38 00 DCW 0x38 ; PHT entry size
LOAD:0000000000400038 02 00 DCW 2 ; Number of entries in PHT
LOAD:000000000040003A 40 00 DCW 0x40 ; SHT entry size
LOAD:000000000040003C 04 00 DCW 4 ; Number of entries in SHT
LOAD:000000000040003E 03 00 DCW 3 ; SHT entry index for string table
LOAD:0000000000400040 ; ELF64 Program Header
LOAD:0000000000400040 ; PHT Entry 0
LOAD:0000000000400040 01 00 00 00 DCD 1 ; Type: LOAD
LOAD:0000000000400044 05 00 00 00 DCD 5 ; Flags
LOAD:0000000000400048 00 00 00 00 00 00 00 00 DCQ 0 ; File offset
LOAD:0000000000400050 00 00 40 00 00 00 00 00 DCQ dword_400000 ; Virtual address
LOAD:0000000000400058 00 00 40 00 00 00 00 00 DCQ 0x400000 ; Physical address
LOAD:0000000000400060 00 01 00 00 00 00 00 00 DCQ 0x100 ; Size in file image
LOAD:0000000000400068 00 01 00 00 00 00 00 00 DCQ 0x100 ; Size in memory image
LOAD:0000000000400070 00 00 01 00 00 00 00 00 DCQ 0x10000 ; Alignment
LOAD:0000000000400078 ; PHT Entry 1
LOAD:0000000000400078 01 00 00 00 DCD 1 ; Type: LOAD
LOAD:000000000040007C 06 00 00 00 DCD 6 ; Flags
LOAD:0000000000400080 00 01 00 00 00 00 00 00 DCQ 0x100 ; File offset
LOAD:0000000000400088 00 01 41 00 00 00 00 00 DCQ unk_410100 ; Virtual address
LOAD:0000000000400090 00 01 41 00 00 00 00 00 DCQ 0x410100 ; Physical address
LOAD:0000000000400098 23 00 00 00 00 00 00 00 DCQ 0x23 ; Size in file image
LOAD:00000000004000A0 23 00 00 00 00 00 00 00 DCQ 0x23 ; Size in memory image
LOAD:00000000004000A8 00 00 01 00 00 00 00 00 DCQ 0x10000 ; Alignment
LOAD:00000000004000A8 ; LOAD ends
LOAD:00000000004000A8
.text:00000000004000B0 ; ---------------------------------------------------------------------------
.text:00000000004000B0 ; ===========================================================================
.text:00000000004000B0
.text:00000000004000B0 ; Segment type: Pure code
.text:00000000004000B0 AREA .text, CODE, ALIGN=3
.text:00000000004000B0 ; ORG 0x4000B0
.text:00000000004000B0 CODE64
.text:00000000004000B0
.text:00000000004000B0 EXPORT start
.text:00000000004000B0 start ; DATA XREF: LOAD:0000000000400018↑o
.text:00000000004000B0 E0 03 00 AA MOV X0, X0
.text:00000000004000B4 E1 03 01 AA MOV X1, X1
.text:00000000004000B8 00 00 00 91 ADD X0, X0, #0
.text:00000000004000BC 00 04 00 91 ADD X0, X0, #1
.text:00000000004000C0 1F 00 00 F1 CMP X0, #0
.text:00000000004000C4 1F 04 00 F1 CMP X0, #1
.text:00000000004000C8 1F 00 01 EB CMP X0, X1
.text:00000000004000CC 20 00 80 D2 MOV X0, #1
.text:00000000004000D0 01 01 00 58 LDR X1, =unk_410100
.text:00000000004000D4 22 01 00 58 LDR X2, =0x23
.text:00000000004000D8 08 08 80 52 MOV W8, #0x40
.text:00000000004000DC 01 00 00 D4 SVC 0
.text:00000000004000E0 00 00 80 D2 MOV X0, #0
.text:00000000004000E4 A8 0B 80 52 MOV W8, #0x5D
.text:00000000004000E8 01 00 00 D4 SVC 0
.text:00000000004000E8 ; ---------------------------------------------------------------------------
.text:00000000004000EC 00 00 00 00 DCD 0
.text:00000000004000F0 00 01 41 00 00 00 00 00 off_4000F0 DCQ unk_410100 ; DATA XREF: .text:00000000004000D0↑r
.text:00000000004000F8 23 00 00 00 00 00 00 00 qword_4000F8 DCQ 0x23 ; DATA XREF: .text:00000000004000D4↑r
.text:00000000004000F8 ; .text ends
.text:00000000004000F8
.data:0000000000410100 ; ===========================================================================
.data:0000000000410100
.data:0000000000410100 ; Segment type: Pure data
.data:0000000000410100 AREA .data, DATA, ALIGN=0
.data:0000000000410100 ; ORG 0x410100
.data:0000000000410100 48 unk_410100 DCB 0x48 ; H ; DATA XREF: LOAD:0000000000400088↑o
.data:0000000000410100 ; .text:00000000004000D0↑o ...
.data:0000000000410101 65 DCB 0x65 ; e
.data:0000000000410102 6C DCB 0x6C ; l
.data:0000000000410103 6C DCB 0x6C ; l
.data:0000000000410104 6F DCB 0x6F ; o
.data:0000000000410105 2C DCB 0x2C ; ,
.data:0000000000410106 20 DCB 0x20
.data:0000000000410107 41 DCB 0x41 ; A
.data:0000000000410108 52 DCB 0x52 ; R
.data:0000000000410109 4D DCB 0x4D ; M
.data:000000000041010A 36 DCB 0x36 ; 6
.data:000000000041010B 34 DCB 0x34 ; 4
.data:000000000041010C 21 DCB 0x21 ; !
.data:000000000041010D 20 DCB 0x20
.data:000000000041010E 57 DCB 0x57 ; W
.data:000000000041010F 72 DCB 0x72 ; r
.data:0000000000410110 69 DCB 0x69 ; i
.data:0000000000410111 74 DCB 0x74 ; t
.data:0000000000410112 74 DCB 0x74 ; t
.data:0000000000410113 65 DCB 0x65 ; e
.data:0000000000410114 6E DCB 0x6E ; n
.data:0000000000410115 20 DCB 0x20
.data:0000000000410116 62 DCB 0x62 ; b
.data:0000000000410117 79 DCB 0x79 ; y
.data:0000000000410118 20 DCB 0x20
.data:0000000000410119 41 DCB 0x41 ; A
.data:000000000041011A 70 DCB 0x70 ; p
.data:000000000041011B 70 DCB 0x70 ; p
.data:000000000041011C 4E DCB 0x4E ; N
.data:000000000041011D 69 DCB 0x69 ; i
.data:000000000041011E 6E DCB 0x6E ; n
.data:000000000041011F 6A DCB 0x6A ; j
.data:0000000000410120 61 DCB 0x61 ; a
.data:0000000000410121 2E DCB 0x2E ; .
.data:0000000000410122 0A DCB 0xA
.data:0000000000410122 ; .data ends
.data:0000000000410122
.data:0000000000410122 END start
Using as (sourceware.org)
Arm Compiler User Guide Version 6.16
使用Android ndk编译32位arm汇编代码_AppNinja 开发手记-CSDN博客
androidarm32arm64汇编源代码，编译批处理，可执行文件，反编译参考。-Android文档类资源-CSDN文库
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