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- ## Copyright (C) 2016 Jeremiah Orians
- ## This file is part of stage0.
- ##
- ## stage0 is free software: you an redistribute it and/or modify
- ## it under the terms of the GNU General Public License as published by
- ## the Free Software Foundation, either version 3 of the License, or
- ## (at your option) any later version.
- ##
- ## stage0 is distributed in the hope that it will be useful,
- ## but WITHOUT ANY WARRANTY; without even the implied warranty of
- ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ## GNU General Public License for more details.
- ##
- ## You should have received a copy of the GNU General Public License
- ## along with stage0. If not, see <http://www.gnu.org/licenses/>.
- # ELF Header
- 7F 45 4C 46 ## e_ident[EI_MAG0-3] ELF's magic number
- 02 ## e_ident[EI_CLASS] Indicating 64 bit
- 01 ## e_ident[EI_DATA] Indicating little endianness
- 01 ## e_ident[EI_VERSION] Indicating original elf
- 00 ## e_ident[EI_OSABI] Set at 0 because none cares
- 00 ## e_ident[EI_ABIVERSION] See above
- 00 00 00 00 00 00 00 ## e_ident[EI_PAD]
- 02 00 ## e_type Indicating Executable
- 3E 00 ## e_machine Indicating AMD64
- 01 00 00 00 ## e_version Indicating original elf
- 78 00 60 00 00 00 00 00 ## e_entry Address of the entry point
- 40 00 00 00 00 00 00 00 ## e_phoff Address of program header table
- 00 00 00 00 00 00 00 00 ## e_shoff Address of section header table
- 00 00 00 00 ## e_flags
- 40 00 ## e_ehsize Indicating our 64 Byte header
- 38 00 ## e_phentsize size of a program header table
- 01 00 ## e_phnum number of entries in program table
- 00 00 ## e_shentsize size of a section header table
- 00 00 ## e_shnum number of entries in section table
- 00 00 ## e_shstrndx index of the section names
- # Program Header Table
- 01 00 00 00 ## p_type
- 06 00 00 00 ## Flags
- 00 00 00 00 00 00 00 00 ## p_offset
- 00 00 60 00 00 00 00 00 ## p_vaddr
- 00 00 00 00 00 00 00 00 ## Undefined
- F1 00 00 00 00 00 00 00 ## p_filesz
- F1 00 00 00 00 00 00 00 ## p_memsz
- 00 00 20 00 00 00 00 00 ## Required alignment
- # Start
- 58 # pop %rax
- 5f # pop %rdi
- 5f # pop %rdi
- 48 83 f8 02 # cmp $0x2,%rax
- 75 5f # jne 6000e0 <Bail>
- 48 c7 c6 00 00 00 00 # mov $0x0,%rsi
- 48 c7 c0 02 00 00 00 # mov $0x2,%rax
- 0f 05 # syscall
- 48 85 c0 # test %rax,%rax
- 78 4a # js 6000e0 <Bail>
- 48 89 c7 # mov %rax,%rdi
- # Circle
- 48 c7 c2 00 00 00 40 # mov $0x40000000,%rdx
- 48 c7 c6 f0 00 60 00 # mov $0x6000f0,%rsi
- 48 c7 c0 00 00 00 00 # mov $0x0,%rax
- 0f 05 # syscall
- 48 85 c0 # test %rax,%rax
- 74 1b # je 6000d0 <Done>
- 48 89 c2 # mov %rax,%rdx
- 48 89 fc # mov %rdi,%rsp
- 48 c7 c7 01 00 00 00 # mov $0x1,%rdi
- 48 c7 c0 01 00 00 00 # mov $0x1,%rax
- 0f 05 # syscall
- 48 89 e7 # mov %rsp,%rdi
- eb c9 # jmp 600099 <Circle>
- # Done
- 48 c7 c7 00 00 00 00 # mov $0x0,%rdi
- 48 c7 c0 3c 00 00 00 # mov $0x3c,%rax
- 0f 05 # syscall
- # Bail
- 48 c7 c7 01 00 00 00 # mov $0x0,%rdi
- 48 c7 c0 3c 00 00 00 # mov $0x3c,%rax
- 0f 05 # syscall
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