1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
.macro bump addr
.word \addr + 0x200000
.endm
.macro label_offset lbl
.word \lbl - str_table
.endm
elf_header:
.byte 0x7F, 'E', 'L', 'F' @ e_ident
.byte 1 @ EI_CLASS => ELFCLASS32
.byte 1 @ EI_DATA => ELFDATA2LSB
.byte 1 @ EI_VERSION => EV_CURRENT
.byte 0 @ EI_OSABI => ELFOSABI_SYSV
.byte 0 @ EI_ABIVERSION
.word 0
.short 0
.byte 0
.short 2 @ e_type => ET_EXEC
.short 40 @ e_machine => EM_ARM
.word 1 @ e_version => EV_CURRENT
bump main @ e_entry
.word program_headers @ e_phoff
.word section_headers @ e_shoff
.word 0x80 @ e_flags => EF_ARM_NEW_ABI
.short 52 @ e_ehsize
.short 32 @ e_phentsize
.short 1 @ e_phnum
.short 40 @ e_shentsize
.short 2 @ e_shnum
.short 1 @ e_shstrndx
program_headers:
.word 1 @ p_type => PT_LOAD
.word O @ p_offset
.word 0x200000 @ p_vaddr
.word 0x200000 @ p_paddr
.word file_size @ p_filesz
.word file_size @ p_memsz
.word 0x5 @ p_flags => PF_X | PF_R
.word 0x1000 @ p_align
section_headers:
.word 0xa0000000 @ label_offset text_lbl @ sh_name
.word 1 @ sh_type => SHT_PROGBITS
.word 0x6 @ sh_flags => SHF_ALLOC | SHF_EXECINSTR
bump main @ sh_addr
.word main @ sh_offset
.word file_size - main @ sh_size
.word 0 @ sh_link
.word 0 @ sh_info
.word 4 @ sh_addralign
.word 0 @ sh_entsize
label_offset strtab_lbl @ sh_name
.word 3 @ sh_type => SHT_STRTAB
.word 0x0 @ sh_flags
.word 0x0 @ sh_addr
.word str_table @ sh_offset
.word 0xb0000000 @ sh_size
.word 0 @ sh_link
.word 0 @ sh_info
.word 1 @ sh_addralign
.word 0 @ sh_entsize
str_table:
.byte 0, 0
text_lbl:
.byte '.', 't', 'e', 'x', 't', 0
strtab_lbl:
.byte '.', 's', 't', 'r', 't', 'a', 'b', 0
main:
mov r7, #1 @ __NR_exit
mov r0, #42 @ $?
svc 0
file_size:
|
