665 lines
17 KiB
Plaintext
665 lines
17 KiB
Plaintext
;; Copyright (C) 2017 Jeremiah Orians
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;; This file is part of stage0.
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;;
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;; stage0 is free software: you can 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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;; Register usage:
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;; EAX, EDX, ECX, EBX => Temps
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;; EDI => IP
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;; EBP => MALLOC
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;; ESI => HEAD
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;; Struct format: (size 24)
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;; NEXT => 0
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;; TARGET => 8
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;; NAME => 16
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; Where the ELF Header is going to hit
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; Simply jump to _start
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; Our main function
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DEFINE ADD32_Absolute32_eax 0305
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DEFINE ADDI32_EBX 81C3
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DEFINE ADDI8_EBP 83C5
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DEFINE ADDI8_EBX 83C3
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DEFINE ADDI8_ECX 83C1
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DEFINE ADDI8_EDI 83C7
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DEFINE ADDI8_EDX 83C2
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DEFINE CALL32 E8
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DEFINE CMP_al_bl 38D8
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DEFINE CMPI8_al 3C
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DEFINE CMPI8_EAX 83F8
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DEFINE CMPI8_EBX 83FB
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DEFINE CMPI8_ECX 83F9
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DEFINE CMPI8_ESI 83FE
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DEFINE COPY_EAX_to_EBP 89C5
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DEFINE COPY_EAX_to_EBX 89C3
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DEFINE COPY_EAX_to_EDX 89C2
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DEFINE COPY_EAX_to_ESI 89C6
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DEFINE COPY_EBP_to_EAX 89E8
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DEFINE COPY_EBP_to_EBX 89EB
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DEFINE COPY_EBX_to_EBP 89DD
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DEFINE COPY_EDI_to_EDX 89FA
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DEFINE INT_80 CD80
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DEFINE JE32 0F84
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DEFINE JG32 0F8F
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DEFINE JL32 0F8C
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DEFINE JMP32 E9
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DEFINE JNE32 0F85
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DEFINE LOAD32_Absolute32_eax A1
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DEFINE LOAD32_Absolute32_ebx 8B1D
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DEFINE LOAD8_Absolute32_al A0
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DEFINE LOAD32_ECX_from_EBX 8B0B
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DEFINE LOAD32_ESI_from_ESI 8B36
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DEFINE LOAD32_EAX_from_ESI_Immediate8 8B46
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DEFINE LOAD32_EDX_from_ESI_Immediate8 8B56
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DEFINE LOAD8_al_from_ECX 8A01
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DEFINE LOAD8_bl_from_EDX 8A1A
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DEFINE LOADI32_EAX B8
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DEFINE LOADI32_EBX BB
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DEFINE LOADI32_ECX B9
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DEFINE LOADI32_EDI BF
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DEFINE LOADI32_EDX BA
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DEFINE LOADI32_ESI BE
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DEFINE MOVZX_al 0FB6C0
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DEFINE MOVZX_bl 0FB6DB
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DEFINE NOT_EAX F7D0
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DEFINE NULL 00000000
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DEFINE POP_EAX 58
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DEFINE POP_EBX 5B
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DEFINE POP_ECX 59
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DEFINE POP_EDI 5F
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DEFINE POP_EDX 5A
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DEFINE POP_ESI 5E
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DEFINE PUSH_EAX 50
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DEFINE PUSH_EBX 53
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DEFINE PUSH_ECX 51
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DEFINE PUSH_EDI 57
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DEFINE PUSH_EDX 52
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DEFINE PUSH_ESI 56
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DEFINE RET C3
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DEFINE SHLI8_EAX C1E0
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DEFINE STORE32_Absolute32_eax A3
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DEFINE STORE32_ECX_into_Address_EBX 890B
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DEFINE STORE32_EDI_into_Address_EAX_Immediate8 8978
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DEFINE STORE32_EBP_into_Address_ESI_Immediate8 896E
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DEFINE STORE32_ESI_into_Address_EAX 8930
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DEFINE STORE8_Absolute32_al A2
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DEFINE STORE8_al_into_Address_EBX 8803
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DEFINE SUBI8_EAX 83E8
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DEFINE SUB_EDX_from_EAX 29D0
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DEFINE TEST 85C0
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:_start
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LOADI32_EBX %0 ; Get current pointer
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CALL32 %malloc ; Get current HEAP
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COPY_EAX_to_EBX ; Using current
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COPY_EAX_to_EBP ; Setup MALLOC
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ADDI32_EBX %8192000 ; Create space for temp
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CALL32 %malloc ; Give ourselves 8192000 bytes to work with
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POP_EAX ;·Get·the·number·of·arguments
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POP_EBX ;·Get·the·program·name
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POP_EBX ;·Get·the·actual·input name
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LOADI32_ECX %0 ;·prepare·read_only
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LOADI32_EDX %0 ; Really sure
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LOADI32_EAX %5 ;·the·syscall·number·for·open()
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INT_80 ; Now open that damn file
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STORE32_Absolute32_eax &Input ; Preserve the file pointer we were given
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POP_EBX ;·Get·the·actual·output name
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LOADI32_ECX %577 ; Prepare file as O_WRONLY|O_CREAT|O_TRUNC
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LOADI32_EDX %448 ; Prepare file as RWX for owner only (700 in octal)
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LOADI32_EAX %5 ;·the·syscall·number·for·open()
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INT_80 ; Now open that damn file
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CMPI8_EAX !0 ; Check for missing output
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JG32 %_start_out ; Have real input
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LOADI32_EAX %1 ; Use stdout
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:_start_out
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STORE32_Absolute32_eax &Output ; Preserve the file pointer we were given
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CALL32 %ClearScratch ; Zero scratch
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LOADI32_EAX %-1 ; Our flag for byte processing
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STORE32_Absolute32_eax &Flag ; Set
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LOADI32_EAX %0 ; temp storage for the sum
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STORE32_Absolute32_eax &High ; Set
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LOADI32_EDI %0x8048000 ; Our starting IP
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LOADI32_ESI %0 ; HEAD = NULL
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CALL32 %First_pass ; Process it
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; rewind input file
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LOAD32_Absolute32_ebx &Input ; Using our input file
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LOADI32_ECX %0 ; Offset Zero
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LOADI32_EDX %0 ; Whence Zero
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LOADI32_EAX %19 ; lseek
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PUSH_ESI ; Protect HEAD
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INT_80
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POP_ESI ; Restore HEAD
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LOADI32_EAX %-1 ; Our flag for byte processing
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STORE32_Absolute32_eax &Flag ; Set
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LOADI32_EAX %0 ; temp storage for the sum
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STORE32_Absolute32_eax &High ; Set
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LOADI32_EDI %0x8048000 ; Our starting IP
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CALL32 %Second_pass ; Process it
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JMP32 %Done
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:First_pass
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CALL32 %Read_byte
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; Deal with EOF
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CMPI8_EAX !-4
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JE32 %First_pass_done
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; Check for :
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CMPI8_EAX !0x3A
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JNE32 %First_pass_0
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; Deal with label
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JMP32 %StoreLabel
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:First_pass_0
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; Check for !
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CMPI8_EAX !0x21
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JE32 %First_pass_pointer
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; Check for @
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CMPI8_EAX !0x40
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JE32 %First_pass_pointer
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; Check for $
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CMPI8_EAX !0x24
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JE32 %First_pass_pointer
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; Check for %
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CMPI8_EAX !0x25
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JE32 %First_pass_pointer
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; Check for &
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CMPI8_EAX !0x26
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JE32 %First_pass_pointer
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; Deal with everything else
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CALL32 %hex ; Process our char
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; Deal with EOF
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CMPI8_EAX !-4
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JE32 %First_pass_done
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; deal with -1 values
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CMPI8_EAX !0
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JL32 %First_pass
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; deal with toggle
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LOAD32_Absolute32_eax &Flag
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CMPI8_EAX !0
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JE32 %First_pass_1
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ADDI8_EDI !1 ; Increment IP
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:First_pass_1
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NOT_EAX
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STORE32_Absolute32_eax &Flag
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JMP32 %First_pass
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:Update_Pointer
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; Check for !
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CMPI8_EAX !0x21
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JE32 %Update_Pointer_1
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; Check for @
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CMPI8_EAX !0x40
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JE32 %Update_Pointer_2
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; Check for $
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CMPI8_EAX !0x24
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JE32 %Update_Pointer_2
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; Check for %
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CMPI8_EAX !0x25
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JE32 %Update_Pointer_4
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; Check for &
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CMPI8_EAX !0x26
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JE32 %Update_Pointer_4
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;; deal with bad input
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CALL32 %fail
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:Update_Pointer_4
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ADDI8_EDI !2 ; Increment IP
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:Update_Pointer_2
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ADDI8_EDI !1 ; Increment IP
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:Update_Pointer_1
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ADDI8_EDI !1 ; Increment IP
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RET
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:First_pass_pointer
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; Deal with Pointer to label
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CALL32 %Update_Pointer ; Increment IP
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LOADI32_EBX &table ; Using scratch
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CALL32 %consume_token ; Read token
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CALL32 %ClearScratch ; Throw away token
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CMPI8_EAX !0x3E ; check for '>'
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JNE32 %First_pass ; Loop again
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;; Deal with %label>label case
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LOADI32_EBX &table ; Write to scratch
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CALL32 %consume_token ; get token
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CALL32 %ClearScratch ; Clean up after ourselves
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JMP32 %First_pass ; Loop again
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:First_pass_done
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RET
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:hex
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; deal with EOF
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CMPI8_EAX !-4
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JE32 %EOF
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; deal with line comments starting with ;
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CMPI8_EAX !0x23
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JE32 %ascii_comment
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; deal with line comments starting with ;
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CMPI8_EAX !0x3B
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JE32 %ascii_comment
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; deal all ascii less than 0
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CMPI8_EAX !0x30
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JL32 %ascii_other
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; deal with 0-9
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CMPI8_EAX !0x3A
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JL32 %ascii_num
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; deal with all ascii less than A
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CMPI8_EAX !0x41
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JL32 %ascii_other
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; deal with A-F
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CMPI8_EAX !0x47
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JL32 %ascii_high
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;deal with all ascii less than a
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CMPI8_EAX !0x61
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JL32 %ascii_other
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;deal with a-f
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CMPI8_EAX !0x67
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JL32 %ascii_low
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; The rest that remains needs to be ignored
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JMP32 %ascii_other
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:Second_pass
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CALL32 %Read_byte
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; Deal with EOF
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CMPI8_EAX !-4
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JE32 %Second_pass_done
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; Simply drop the label
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CMPI8_EAX !0x3A
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JNE32 %Second_pass_0
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LOADI32_EBX &table ; Using scratch
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CALL32 %consume_token ; Read token
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CALL32 %ClearScratch ; Throw away token
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JMP32 %Second_pass
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:Second_pass_0
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; Deal with % pointer
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CMPI8_EAX !0x25
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JE32 %StorePointer_rel4
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; Deal with @ pointer
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CMPI8_EAX !0x40
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JE32 %StorePointer_rel2
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; Deal with ! pointer
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CMPI8_EAX !0x21
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JE32 %StorePointer_rel1
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; Deal with & pointer
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CMPI8_EAX !0x26
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JE32 %StorePointer_abs4
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; Deal with $ pointer
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CMPI8_EAX !0x24
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JE32 %StorePointer_abs2
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:Second_pass_1
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; Deal with everything else
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CALL32 %hex ; Process our char
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; Deal with EOF
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CMPI8_EAX !-4
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JE32 %Second_pass_done
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; deal with -1 values
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CMPI8_EAX !0
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JL32 %Second_pass
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; deal with toggle
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LOAD32_Absolute32_ebx &Flag
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CMPI8_EBX !0
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JE32 %print
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; process first byte of pair
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SHLI8_EAX !4
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STORE32_Absolute32_eax &High
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LOADI32_EAX %0
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STORE32_Absolute32_eax &Flag
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JMP32 %Second_pass
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:Second_pass_done
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RET
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:EOF
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RET
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:ascii_num
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SUBI8_EAX !0x30
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RET
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:ascii_low
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SUBI8_EAX !0x57
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RET
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:ascii_high
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SUBI8_EAX !0x37
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RET
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:ascii_other
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LOADI32_EAX %-1
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RET
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:ascii_comment
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CALL32 %Read_byte
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CMPI8_EAX !0x0D
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JE32 %ascii_comment_cr
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CMPI8_EAX !0x0A
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JNE32 %ascii_comment
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:ascii_comment_cr
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LOADI32_EAX %-1
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RET
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; process second byte of pair
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:print
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; update the sum and store in output
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ADD32_Absolute32_eax &High
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STORE8_Absolute32_al &table
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; flip the toggle
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LOAD32_Absolute32_eax &Flag
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NOT_EAX
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STORE32_Absolute32_eax &Flag
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; Print our first Hex
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LOADI32_EDX %1 ; set the size of chars we want
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CALL32 %print_chars
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ADDI8_EDI !1 ; Increment IP
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JMP32 %Second_pass
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:Done
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; program completed Successfully
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LOADI32_EBX %0 ; All is well
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LOADI32_EAX %1 ; put the exit syscall number in eax
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INT_80 ; Call it a good day
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;; Malloc isn't actually required if the program being built fits in the initial memory
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;; However, it doesn't take much to add it.
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;; Requires a value in EBX
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:malloc
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LOADI32_EAX %45 ; the Syscall # for SYS_BRK
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PUSH_ESI ; Protect esi
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PUSH_EDI ; Protect edi
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INT_80 ; call the Kernel
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POP_EDI ; Restore edi
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POP_ESI ; Restore esi
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RET
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:Read_byte
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; Attempt to read 1 byte from STDIN
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PUSH_ESI ; Protect esi
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PUSH_EDI ; Protect edi
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PUSH_EBX ; Protect ebx
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PUSH_ECX ; Protect ecx
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LOADI32_EDX %1 ; set the size of chars we want
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LOADI32_ECX &write ; Where to put it
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LOAD32_Absolute32_ebx &Input ; Where are we reading from
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LOADI32_EAX %3 ; the syscall number for read
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INT_80 ; call the Kernel
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POP_ECX ; Restore ecx
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POP_EBX ; Restore ebx
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POP_EDI ; Restore edi
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POP_ESI ; Restore esi
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TEST ; check what we got
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JE32 %Read_byte_1 ; Got EOF call it done
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; load byte
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LOAD8_Absolute32_al &write ; load char
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MOVZX_al ; We have to zero extend it to use it
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RET
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; Deal with EOF
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:Read_byte_1
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LOADI32_EAX %-4 ; Put EOF in eax
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RET
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:print_chars
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PUSH_ESI ; Protect esi
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PUSH_EDI ; Protect edi
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PUSH_EBX ; Protect ebx
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PUSH_ECX ; Protect ecx
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LOADI32_ECX &table ; What we are writing
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LOAD32_Absolute32_ebx &Output ; Write to target file
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LOADI32_EAX %4 ; the syscall number for write
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INT_80 ; call the Kernel
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POP_ECX ; Restore ecx
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POP_EBX ; Restore ebx
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POP_EDI ; Restore edi
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POP_ESI ; Restore esi
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RET
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;; Receives pointer in EBX
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;; Writes out char and updates EBX
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:consume_token
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CALL32 %Read_byte ; Consume_token
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; Check for \t
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CMPI8_EAX !0x09
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JE32 %consume_token_done
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; Check for \n
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CMPI8_EAX !0x0A
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JE32 %consume_token_done
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; Check for ' '
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CMPI8_EAX !0x20
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JE32 %consume_token_done
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; Check for '>'
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CMPI8_EAX !0x3E
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JE32 %consume_token_done
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;; Looks like we are still reading token
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STORE8_al_into_Address_EBX ; Store char
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ADDI8_EBX !1 ; Point to next spot
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JMP32 %consume_token ; loop until done
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:consume_token_done
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LOADI32_ECX %0 ; Padd with nulls
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STORE32_ECX_into_Address_EBX
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ADDI8_EBX !4
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RET
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:StoreLabel
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COPY_EBP_to_EAX ; ENTRY
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ADDI8_EBP !24 ; CALLOC
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STORE32_EDI_into_Address_EAX_Immediate8 !8 ; ENTRY->TARGET = IP
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STORE32_ESI_into_Address_EAX ; ENTRY->NEXT = JUMP_TABLE
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COPY_EAX_to_ESI ; JUMP_TABLE = ENTRY
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STORE32_EBP_into_Address_ESI_Immediate8 !16 ; ENTRY->NAME = TOKEN
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COPY_EBP_to_EBX ; Write Starting after struct
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CALL32 %consume_token ; Collect whole string
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COPY_EBX_to_EBP ; Update HEAP
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JMP32 %First_pass
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:GetTarget
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PUSH_EBX ; protect ebx
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PUSH_ECX ; protect ecx
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PUSH_EDX ; protect edx
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PUSH_ESI ; protect JUMP_TABLE
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LOADI32_ECX &table ; Reset scratch
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LOAD32_EDX_from_ESI_Immediate8 !16 ; I->NAME
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:GetTarget_loop
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LOAD8_al_from_ECX ; I->NAME[0]
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LOAD8_bl_from_EDX ; scratch[0]
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MOVZX_bl ; Zero extend
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MOVZX_al ; Zero extend
|
|
CMP_al_bl ; IF TOKEN == I->NAME
|
|
JNE32 %GetTarget_miss ; Oops
|
|
|
|
ADDI8_ECX !1
|
|
ADDI8_EDX !1
|
|
CMPI8_al !0
|
|
JNE32 %GetTarget_loop ; Loop until
|
|
JMP32 %GetTarget_done ; Match
|
|
|
|
;; Miss
|
|
:GetTarget_miss
|
|
LOAD32_ESI_from_ESI ; I = I->NEXT
|
|
CMPI8_ESI !0 ; IF NULL == I
|
|
JE32 %fail ; Abort hard
|
|
|
|
LOAD32_EDX_from_ESI_Immediate8 !16 ; I->NAME
|
|
LOADI32_ECX &table ; Reset scratch
|
|
JMP32 %GetTarget_loop
|
|
|
|
:GetTarget_done
|
|
LOAD32_EAX_from_ESI_Immediate8 !8 ; Get address
|
|
POP_ESI ; Restore JUMP_TABLE
|
|
POP_EDX ; Restore EDX
|
|
POP_ECX ; Restore ECX
|
|
POP_EBX ; Restore EBX
|
|
RET
|
|
|
|
:ClearScratch
|
|
PUSH_EAX ; Protect against changes
|
|
PUSH_EBX ; And overwrites
|
|
PUSH_ECX ; While we work
|
|
LOADI32_EBX &table ; Where our table is
|
|
LOADI32_EAX %0 ; Using null
|
|
|
|
:ClearScratch_loop
|
|
LOAD32_ECX_from_EBX ; Get current value
|
|
STORE8_al_into_Address_EBX ; Because we want null
|
|
ADDI8_EBX !1 ; Increment
|
|
CMPI8_ECX !0 ; Check if we hit null
|
|
JNE32 %ClearScratch_loop ; Keep looping
|
|
|
|
POP_ECX ; Restore
|
|
POP_EBX ; Damage
|
|
POP_EAX ; Entirely
|
|
RET
|
|
|
|
:StorePointer
|
|
CALL32 %Update_Pointer ; Increment IP
|
|
LOADI32_EBX &table ; Write to scratch
|
|
CALL32 %consume_token ; get token
|
|
PUSH_EAX ; Protect base_sep_p
|
|
LOADI32_EAX &table ; Pointer to scratch
|
|
CALL32 %GetTarget ; Get address of pointer
|
|
CALL32 %ClearScratch ; Clean up after ourselves
|
|
COPY_EDI_to_EDX ; base = IP
|
|
POP_EBX ; Restore base_sep_p
|
|
CMPI8_EBX !0x3E ; If base_sep_p == '>'
|
|
JNE32 %StorePointer_done ; If not
|
|
|
|
;; Deal with %label>label case
|
|
PUSH_EAX ; We need to preserve main target
|
|
LOADI32_EBX &table ; Write to scratch
|
|
CALL32 %consume_token ; get token
|
|
LOADI32_EAX &table ; Pointer to scratch
|
|
CALL32 %GetTarget ; Get address of pointer
|
|
CALL32 %ClearScratch ; Clean up after ourselves
|
|
COPY_EAX_to_EDX ; Use our new base
|
|
POP_EAX ; Restore main target
|
|
|
|
:StorePointer_done
|
|
RET
|
|
|
|
:StorePointer_rel4
|
|
CALL32 %StorePointer ; Do Common
|
|
SUB_EDX_from_EAX ; target - ip
|
|
STORE32_Absolute32_eax &table ; put value in output
|
|
LOADI32_EDX %4 ; set the size of chars we want
|
|
CALL32 %print_chars
|
|
CALL32 %ClearScratch ; Clean up after ourselves
|
|
JMP32 %Second_pass
|
|
|
|
:StorePointer_rel2
|
|
CALL32 %StorePointer ; Do Common
|
|
SUB_EDX_from_EAX ; target - ip
|
|
STORE32_Absolute32_eax &table ; put value in output
|
|
LOADI32_EDX %2 ; set the size of chars we want
|
|
CALL32 %print_chars
|
|
CALL32 %ClearScratch ; Clean up after ourselves
|
|
JMP32 %Second_pass
|
|
|
|
:StorePointer_rel1
|
|
CALL32 %StorePointer ; Do Common
|
|
SUB_EDX_from_EAX ; target - ip
|
|
STORE32_Absolute32_eax &table ; put value in output
|
|
LOADI32_EDX %1 ; set the size of chars we want
|
|
CALL32 %print_chars
|
|
CALL32 %ClearScratch ; Clean up after ourselves
|
|
JMP32 %Second_pass
|
|
|
|
:StorePointer_abs4
|
|
CALL32 %StorePointer ; Do Common
|
|
STORE32_Absolute32_eax &table ; put value in output
|
|
LOADI32_EDX %4 ; set the size of chars we want
|
|
CALL32 %print_chars
|
|
CALL32 %ClearScratch ; Clean up after ourselves
|
|
JMP32 %Second_pass
|
|
|
|
:StorePointer_abs2
|
|
CALL32 %StorePointer ; Do Common
|
|
STORE32_Absolute32_eax &table ; put value in output
|
|
LOADI32_EDX %2 ; set the size of chars we want
|
|
CALL32 %print_chars
|
|
CALL32 %ClearScratch ; Clean up after ourselves
|
|
JMP32 %Second_pass
|
|
|
|
:fail
|
|
; Some shit went wrong
|
|
LOADI32_EBX %1 ; All is wrong
|
|
LOADI32_EAX %1 ; put the exit syscall number in eax
|
|
INT_80 ; Call it a good day
|
|
|
|
|
|
:High
|
|
NULL
|
|
:Flag
|
|
NULL
|
|
:Input
|
|
NULL
|
|
:Output
|
|
NULL
|
|
:write
|
|
NULL
|
|
:table
|
|
NULL
|
|
:ELF_end
|