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