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hex2a.he
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#
# HEX2 for Linux-i386-ELF
#
# Copyright (C) 2001, Edmund GRIMLEY EVANS <edmundo@rano.org>
#
# Elf32_Ehdr
7f 45 4c 46 01 01 01 # e_ident
00 00 00 00 00 00 00 00 00
02 00 # e_type
03 00 # e_machine
01 00 00 00 # e_version
25 82 04 08 #! # e_entry = 0x08048000 + len(ehdr) + len(phdr)
34 00 00 00 # e_phoff = len(ehdr)
00 00 00 00 # e_shoff
00 00 00 00 # e_flags
34 00 # e_ehsize = len(ehdr)
20 00 # e_phentsize = len(phdr)
01 00 # e_phnum
00 00 # e_shentsize
00 00 # e_shnum
00 00 # e_shstrndx
# Elf32_Phdr
01 00 00 00 # p_type
00 00 00 00 # p_offset
00 80 04 08 # p_vaddr = 0x08048000
00 80 04 08 # p_paddr = 0x08048000
44 02 00 00 #! # p_filesz = len(ehdr) + len(phdr) + len(prog)
44 02 00 00 #! # p_memsz = len(ehdr) + len(phdr) + len(prog)
07 00 00 00 # p_flags
00 10 00 00 # p_align
# A stackless implementation of exit(42), for debugging:
# 31 c0 40 b3 2a cd 80
# pos: # 0x08048054
00 00 00 00
# label: # 0x08048058
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00
# getchar:
6a 00 # push $0x0
31 db # xor %ebx,%ebx
89 e1 # mov %esp,%ecx
89 da # mov %ebx,%edx
42 # inc %edx
b8 03 00 00 00 # mov $0x3,%eax
cd 80 # int $0x80
85 c0 # test %eax,%eax
74 02 # je exit
58 # pop %eax
c3 # ret
# exit:
31 c0 # xor %eax,%eax
89 c3 # mov %eax,%ebx
40 # inc %eax
cd 80 # int $0x80
# gethex:
e8 de ff ff ff # call getchar
83 f8 20 # cmp $0x20,%eax
7e f6 # jle gethex
83 f8 23 # cmp $0x23,%eax
75 0c # jne .l1
# .loop:
e8 cf ff ff ff # call getchar
83 f8 0a # cmp $0xa,%eax
75 f6 # jne .loop
eb e5 # jmp gethex
# .l1:
83 f8 2e # cmp $0x2e,%eax
75 19 # jne .l2
e8 be ff ff ff # call getchar
25 ff 00 00 00 # and $0xff,%eax
05 58 80 04 08 # add label,%eax
8b 1d 54 80 04 08 # mov pos,%ebx
89 18 # mov %ebx,(%eax)
eb c7 # jmp gethex
# .l2:
83 f8 30 # cmp $0x30,%eax
7c 09 # jl .l3
83 f8 3a # cmp $0x3a,%eax
7d 04 # jge .l3
83 e8 30 # sub $0x30,%eax
c3 # ret
# .l3:
83 f8 61 # cmp $0x61,%eax
7c 09 # jl .l4
83 f8 67 # cmp $0x67,%eax
7d 04 # jge .l4
83 e8 57 # sub $0x57,%eax
c3 # ret
# .l4:
25 ff 00 00 00 # and $0xff,%eax
05 58 80 04 08 # add label,%eax
8b 18 # mov (%eax),%ebx
a1 54 80 04 08 # mov pos,%eax
83 c0 04 # add $0x4,%eax
a3 54 80 04 08 # mov %eax,pos
29 c3 # sub %eax,%ebx
89 d8 # mov %ebx,%eax
50 # push %eax
e8 24 00 00 00 # call putchar
58 # pop %eax
c1 f8 08 # sar $0x8,%eax
50 # push %eax
e8 1a 00 00 00 # call putchar
58 # pop %eax
c1 f8 10 # sar $0x10,%eax
50 # push %eax
e8 10 00 00 00 # call putchar
58 # pop %eax
c1 f8 18 # sar $0x18,%eax
50 # push %eax
e8 06 00 00 00 # call putchar
58 # pop %eax
e9 64 ff ff ff # jmp gethex
# putchar:
31 db # xor %ebx,%ebx
43 # inc %ebx
8d 4c 24 04 # lea 0x4(%esp,1),%ecx
89 da # mov %ebx,%edx
b8 04 00 00 00 # mov $0x4,%eax
cd 80 # int $0x80
c3 # ret
# _start:
e8 4e ff ff ff # call gethex
c1 e0 04 # shl $0x4,%eax
50 # push %eax
e8 45 ff ff ff # call gethex
01 04 24 # add %eax,(%esp,1)
ff 05 54 80 04 08 # incl 0x0
e8 d3 ff ff ff # call putchar
58 # pop %eax
eb e1 # jmp _start