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+; bfc : a brainfuck compiler & interpreter
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+; Copyright (C) 2018 Weber Yann
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+;
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+; This program 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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+; any later version.
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+;
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+; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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+;
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+; A brainfuck compiler & interpreter :
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+; Build : nasm -felf64 bfc.asm && ld -s -melf_x86_64 bfc.o -o bfc
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+;
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+; ./bfc [-h] [-e [-o a.out]] FILE.bf
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+; Options :
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+; -h print usage and exit
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+; -e tell bfc to produce a elf file
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+; -o with -e indicate the file to create
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+; FILE.bf the brainfuck source file to compile
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+[bits 64]
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+%use smartalign
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+ALIGNMODE k8
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+
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+%define lbl_incresize 0x2e
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+%define lbl_decresize 0x50
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+
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+%define MAP_INC_SIZE 0x1000
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+%define MAP_INC_MASK 0x0FFF
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+%define BFMEM_INIT_SZ MAP_INC_SIZE
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+
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+section .data
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+
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+ bf_start_head:
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+ push 0x00400085
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+ ;dw 0x6885004000
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+ bf_start_head_sz: equ $ - bf_start_head
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+ bf_start:
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+ jmp .start
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+ .mremap: ; rbx is resize size
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+ cmp rbx, MAP_INC_SIZE
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+ jg .remap_cont
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+ xor rbx, rbx
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+ .remap_cont:
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+ xor rbx, MAP_INC_MASK
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+ add rbx, MAP_INC_SIZE
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+ add r14, rbx
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+ mov rax, 0x19 ; mremap
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+ mov rdi, r15 ; addr
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+ mov rsi, r14 ; oldlen
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+ jc .erremap ; overflow, too much mem !!!!
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+ mov rdx, r14 ; newlen
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+ xor r10, r10 ; maymove
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+ xor r11, r11
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+ syscall
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+ cmp rax, 0
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+ jle .erremap
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+ mov r15, rax
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+ ret
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+ .erremap:
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+ mov rax, 0x3c
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+ mov rdi, 0x2
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+ syscall
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+ align 8
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+ .lbl_incresize: equ $ - bf_start
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+ .incresize: ; rbx is resize size
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+ call .mremap
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+ ret
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+ align 8
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+ .lbl_decresize: equ $ - bf_start
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+ .decresize: ; rbx is decrement
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+ push rsi
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+ push r14
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+ call .incresize
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+ pop rcx ; old size
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+ mov rdi, rsi
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+ inc rdi
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+ .decresize_cpy:
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+ movsb
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+ loop .decresize_cpy
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+ mov byte [r15], 0
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+ pop rsi
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+ ret
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+ .errmap:
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+ mov rax, 0x3c
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+ mov rdi, 0x1
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+ syscall
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+ .start:
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+ ;map init
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+ mov rax, 0x9 ;mmap
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+ xor rdi, rdi
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+ mov rsi, BFMEM_INIT_SZ ;len
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+ mov r14, rsi
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+ mov rdx, (0x1|0x2) ;PROT_READ | PROT_WRITE
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+ mov r10, (0x2 | 0x20) ;flags MAP_PRIVATE | MAP_ANONYMOUS
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+ mov r8, -1 ;fd
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+ xor r9, r9
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+ syscall
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+ cmp rax, 0
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+ jle .errmap
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+ mov r15, rax
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+ mov rsi, r15
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+ add rsi, (BFMEM_INIT_SZ / 2) ; BF ptr
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+ align 8
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+ bf_start_sz: equ $ - bf_start
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+
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+
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+ ; In piece of code call jump is achieved by adding
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+ ; an offset to the JIT map base addr
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+ ; this base address has to be on top of the stack
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+ ; when executing this small piece of code
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+ ;
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+ ; the first instruction has to be a mov of a byte
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+ ; in a register. This operation will be updated to
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+ ; "pass" a parameter
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+ bf_decptr:
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+ mov rbx, strict qword 0x1
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+ push rbx
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+ cmp rsi, rbx
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+ jge .end
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+ mov rax, [rsp+8]
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+ add rax, bf_start.lbl_decresize
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+ call rax
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+ .end:
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+ pop rbx
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+ sub rsi, rbx
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+ bf_decptr_sz: equ $ - bf_decptr
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+
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+ bf_incptr:
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+ mov rbx, strict qword 0x1
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+ push rbx
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+ mov rax, rsi
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+ sub rax, r15
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+ cmp rax, r14
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+ jl .end
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+ mov rax, [rsp+8]
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+ add rax, bf_start.lbl_incresize
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+ call rax
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+ .end:
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+ pop rbx
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+ add rsi, rbx
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+ bf_incptr_sz: equ $ - bf_incptr
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+
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+ bf_incval:
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+ mov rbx, strict qword 0x1
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+ xor rax, rax
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+ mov al,[rsi]
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+ add rax, rbx
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+ mov [rsi], al
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+ bf_incval_sz: equ $ - bf_incval
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+
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+ bf_decval:
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+ mov rbx, strict qword 0x1
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+ xor rax, rax
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+ mov al, [rsi]
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+ sub rax, rbx
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+ mov [rsi], al
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+ bf_decval_sz: equ $ - bf_decval
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+
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+ bf_readval:
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+ mov rdx, strict qword 0x1
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+ push rsi
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+ xor rax, rax ; read
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+ xor rdi, rdi ; stdin
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+ syscall
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+ test rax, rax
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+ jnz .end
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+ mov byte [rsi], 0
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+ .end:
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+ pop rsi
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+ bf_readval_sz: equ $ - bf_readval
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+
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+ bf_writeval:
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+ mov rdx, strict qword 0x1
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+ push rsi
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+ xor rax, rax ; write
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+ inc rax
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+ mov rdi, rax ; stdout
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+ syscall
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+ pop rsi
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+ bf_writeval_sz: equ $ - bf_writeval
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+
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+ bf_loopstart:
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+ mov rbx, strict qword 0x1
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+ add rbx, [rsp]
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+ xor rdx, rdx
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+ mov dl, [rsi]
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+ cmp dl, 0
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+ jnz .end
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+ jmp rbx
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+ .end:
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+ bf_loopstart_sz: equ $ - bf_loopstart
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+
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+ bf_loopend:
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+ mov rbx, strict qword 0x1
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+ add rbx, [rsp]
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+ xor rdx, rdx
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+ mov dl, [rsi]
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+ cmp dl, 0
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+ jz .end
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+ jmp rbx
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+ .end:
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+ bf_loopend_sz: equ $ - bf_loopend
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+
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+ bf_exit:
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+ mov rax, 0x3c
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+ xor rdi, rdi
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+ syscall
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+ bf_exit_sz: equ $ - bf_exit
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+
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+ elf_head: dw 0x457f, 0x464c, 0x0102, 0x0001,
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+ times 4 dw 0x0
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+ ; 0x10
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+ dw 0x0002, 0x003e, 0x0001, 0x0000
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+ dw 0x080, 0x040, 0x0, 0x0
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+ ; 0x20
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+ dw 0x0040
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+ times 3 dw 0x0
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+ elf_section_head_offset : times 8 db 0xFF ; 0x28
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+ ; 0x30
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+ dw 0x0, 0x0, 0x40, 0x38, 0x1, 0x40, 0x3, 0x2
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+ ; 0x40 section header
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+ dw 0x1, 0x0, 0x5 ; load in memory with RX perm
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+ times 5 dw 0x0
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+ ; 0x50
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+ dw 0x0, 0x40, 0, 0, 0, 0x40, 0, 0 ; load at 0x40000
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+ ; 0x60
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+ elf_prog_sz: times 16 db 0xFF ; 0x60 & 0x 68
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+ ; 0x70
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+ dw 0x0, 0x20
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+ times 6 dw 0x0
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+ elf_head_sz: equ $ - elf_head
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+
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+ elf_shstrtab: db ".shstrtab", 0x0, ".text", 0x0
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+ align 8
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+ elf_shstrtab_sz: equ $ - elf_shstrtab
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+
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+ elf_section_headers: times 8 dq 0x0 ; head0
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+ ; head 1
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+ dw 0xb, 0, 0x1, 0, 0x6, 0, 0, 0
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+ dw 0x80, 0x40, 0, 0, 0x80, 0, 0, 0
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+ elf_section_text_sz: times 8 db 0xFF
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+ dq 0x0
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+ dw 0x10
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+ times 7 dw 0x0
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+ ; head2
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+ dw 0x1, 0, 0x3 , 0, 0, 0, 0, 0
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+ dq 0x0
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+ elf_section_strtab_off: times 8 db 0xFF
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+ dw 0x11
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+ times 7 dw 0x0
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+ dw 0x1
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+ times 7 dw 0x0
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+ elf_section_headers_sz: equ $ - elf_section_headers
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+
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+ default_output: db "a.out", 0x0
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+
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+ miss_open: db "Missing opening '[' matching closing ']'"
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+ miss_open_sz: equ $ - miss_open
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+ chr_list : db ": ", 0xA, 0x0
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+ read_error: db "Error reading file "
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+ read_error_sz: equ $ - read_error
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+ usage_err: db "Usage : [-e [-o a.out]] FILE.BF"
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+ usage_err_sz: equ $ - usage_err
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+ open_err: db "Error opening file", 0xa
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+ open_err_sz: equ $ - open_err
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+
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+section .text
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+global _start
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+_start:
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+; using heap to store arguments
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+%define bf_source [r13]
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+%define elf_file [r13+0x8]
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+%define elf_out [r13+0x11]
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+%define heap_size 0x12
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+
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+ mov rax, 0xc
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+ xor rdi, rdi
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+ syscall
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+ mov rdi, rax
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+ mov r13, rax ; heap start
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+ add rdi, heap_size
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+ mov rax, 0xc
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+ syscall
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+
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+ ;argument parsing
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+ mov rcx, [rsp] ; argc
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+ cmp rcx, 2
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+ jl .badarg
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+ je .init_1arg
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+ cmp rcx, 5
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+ jg .badarg
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+
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+ mov rsi, rsp
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+ add rsi, 8 ; argv[0]
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+ dec rcx
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+ .argloop:
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+ add rsi, 8
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+ mov rdi, [rsi]
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+ mov al, [rdi]
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+ cmp al, 0x2d ; '-'
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+ jne .filearg
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+ mov al, [rdi+2]
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+ test al, al
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+ jnz .filearg
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+ ; arg is '-X' testing X
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+ mov al, [rdi+1]
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+ cmp al, 0x68 ; '-h'
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+ je .badarg
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+ cmp al, 0x65 ; '-e'
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+ je .elfout_arg
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+ cmp al, 0x6f ; '-o'
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+ jne .badarg
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+
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+ ; -o storing file
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+ test rcx, rcx
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+ jz .badarg ; no more args
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+ dec rcx
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+ add rsi, 8
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+ mov rdi, [rsi]
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+ mov elf_file, rdi
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+ loop .argloop
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+ jmp .init
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+
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+ .elfout_arg:
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+ mov al, 0x1
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+ mov elf_out, al
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+ mov rax, elf_file
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+ test rax, rax
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+ jz .default_out
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+ .elfout_arg_end:
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+ loop .argloop
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+ jmp .init
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+ .default_out:
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+ mov rax, default_output
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+ mov elf_file, rax
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+ jmp .elfout_arg_end
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+
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+ .filearg:
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+ mov rax, bf_source
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+ cmp rax, 0
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+ .br3:
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+ jnz .badarg ; file allready given
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+ mov bf_source, rdi
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+ loop .argloop
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+ jmp .init
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+
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+ .init_1arg:
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+ mov rax, [rsp+16]
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+ mov bf_source, rax
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+ .init:
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+ ; code map init
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+ ; rsi map size
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+ mov rsi, 0x10
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+ call initmap
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+
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+ mov rax, 0x2 ; open
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+ mov rdi, bf_source ; from heap
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+ test rdi, rdi
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+ jz .badarg
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+ xor rsi, rsi ; O_RDONLY
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367
|
+ xor rdx, rdx ; no mode
|
|
368
|
+ syscall
|
|
369
|
+ cmp rax, 0
|
|
370
|
+ jl .err_open
|
|
371
|
+ push rax ; fd
|
|
372
|
+ push r13 ; heap
|
|
373
|
+
|
|
374
|
+ call compile_bf
|
|
375
|
+
|
|
376
|
+ pop r13 ; heap
|
|
377
|
+ pop rdi ; fd
|
|
378
|
+ sub rax, r15
|
|
379
|
+ push rax ; map len
|
|
380
|
+
|
|
381
|
+ mov rax, 0x3 ; close
|
|
382
|
+ syscall
|
|
383
|
+
|
|
384
|
+ mov al, elf_out
|
|
385
|
+ test al, al
|
|
386
|
+ jnz .write_elf
|
|
387
|
+
|
|
388
|
+
|
|
389
|
+ .code_jmp:
|
|
390
|
+ ; restore heap
|
|
391
|
+ mov rax, 0xc
|
|
392
|
+ mov rdi, r13
|
|
393
|
+ syscall
|
|
394
|
+ ; set code map perm
|
|
395
|
+ mov rax, 0xA ; mprotect
|
|
396
|
+ mov rdi, r15
|
|
397
|
+ mov rsi, r14
|
|
398
|
+ mov rdx, 0x4 | 0x1 ; PROT_EXEC | PROT_READ
|
|
399
|
+ syscall
|
|
400
|
+
|
|
401
|
+ push r15
|
|
402
|
+ jmp r15 ; end... jumping in bf code map
|
|
403
|
+
|
|
404
|
+ .write_elf: ; writing elf file
|
|
405
|
+ mov rax, [rsp] ; map len
|
|
406
|
+ add rax, bf_start_head_sz
|
|
407
|
+ mov [elf_section_text_sz], rax
|
|
408
|
+ add rax, elf_head_sz ; elf head + map_ptr
|
|
409
|
+ mov [elf_head + 0x60], rax
|
|
410
|
+ mov [elf_head + 0x68], rax
|
|
411
|
+ mov [elf_section_strtab_off], rax
|
|
412
|
+ add rax, elf_shstrtab_sz ; section head offset
|
|
413
|
+ xor r14, r14 ; store align padding for section header
|
|
414
|
+ xor rbx, rbx
|
|
415
|
+ mov bl, al
|
|
416
|
+ and bl, 0x0F
|
|
417
|
+ test bl, bl
|
|
418
|
+ jz .aligned_section
|
|
419
|
+ mov r14, 0x10
|
|
420
|
+ sub r14, rbx
|
|
421
|
+ and al, 0xF0
|
|
422
|
+ add rax, 0x10
|
|
423
|
+ .aligned_section:
|
|
424
|
+ mov [elf_head + 0x28], rax
|
|
425
|
+
|
|
426
|
+ mov rax, 0x2
|
|
427
|
+ mov rdi, elf_file
|
|
428
|
+ mov rsi, 0x40 | 0x200 | 0x1 ; O_CREAT | O_TRUNC | O_WRONLY
|
|
429
|
+ mov rdx, 755o ; perm
|
|
430
|
+ syscall
|
|
431
|
+ cmp rax, 0
|
|
432
|
+ jl .err_open
|
|
433
|
+
|
|
434
|
+ push rax ; fd
|
|
435
|
+
|
|
436
|
+ mov rax, 1
|
|
437
|
+ mov rdi, [rsp]
|
|
438
|
+ mov rsi, elf_head
|
|
439
|
+ mov rdx, elf_head_sz
|
|
440
|
+ syscall
|
|
441
|
+
|
|
442
|
+ mov rax, 1
|
|
443
|
+ mov rdi, [rsp]
|
|
444
|
+ mov rsi, bf_start_head
|
|
445
|
+ mov rdx, bf_start_head_sz
|
|
446
|
+ syscall
|
|
447
|
+
|
|
448
|
+ mov rax, 1
|
|
449
|
+ mov rdi, [rsp]
|
|
450
|
+ mov rsi, r15 ; map_addr
|
|
451
|
+ mov rdx, [rsp+8] ; map len
|
|
452
|
+ syscall
|
|
453
|
+
|
|
454
|
+ mov rax, 1
|
|
455
|
+ mov rdi, [rsp]
|
|
456
|
+ mov rsi, elf_shstrtab
|
|
457
|
+ mov rdx, elf_shstrtab_sz
|
|
458
|
+ syscall
|
|
459
|
+
|
|
460
|
+ .padloop:
|
|
461
|
+ test r14, r14
|
|
462
|
+ jz .end_padloop
|
|
463
|
+ mov rax, 1
|
|
464
|
+ mov rdi, [rsp]
|
|
465
|
+ mov rsi, elf_section_headers ; 0x0
|
|
466
|
+ mov rdx, 1
|
|
467
|
+ syscall
|
|
468
|
+ dec r14
|
|
469
|
+ jmp .padloop
|
|
470
|
+ .end_padloop:
|
|
471
|
+
|
|
472
|
+ mov rax, 1
|
|
473
|
+ mov rdi, [rsp]
|
|
474
|
+ mov rsi, elf_section_headers
|
|
475
|
+ mov rdx, elf_section_headers_sz
|
|
476
|
+ syscall
|
|
477
|
+
|
|
478
|
+ pop rdi ; fd
|
|
479
|
+ mov rax, 0x3 ; close
|
|
480
|
+ syscall
|
|
481
|
+ pop rax ; map_len
|
|
482
|
+
|
|
483
|
+ mov rax, 0x3c ; exit
|
|
484
|
+ xor rdi, rdi
|
|
485
|
+ syscall
|
|
486
|
+
|
|
487
|
+
|
|
488
|
+ .err_open:
|
|
489
|
+ mov rax, 1 ; write
|
|
490
|
+ mov rdi, 2 ; stderr
|
|
491
|
+ mov rsi, open_err
|
|
492
|
+ mov rdx, open_err_sz
|
|
493
|
+ syscall
|
|
494
|
+ .badarg:
|
|
495
|
+ mov rax, 1 ;write
|
|
496
|
+ mov rdi, 2 ; stderr
|
|
497
|
+ mov rsi, usage_err
|
|
498
|
+ mov rdx, 8 ; "Usage : "
|
|
499
|
+ syscall
|
|
500
|
+
|
|
501
|
+ mov rsi, [rsp+8] ; argv[0]
|
|
502
|
+ xor rdx, rdx
|
|
503
|
+ xor rcx, rcx
|
|
504
|
+ .argv0len:
|
|
505
|
+ inc rsi
|
|
506
|
+ inc rdx
|
|
507
|
+ mov cl, [rsi]
|
|
508
|
+ test cl, cl
|
|
509
|
+ jnz .argv0len
|
|
510
|
+
|
|
511
|
+ mov rax, 1
|
|
512
|
+ mov rdi, 2
|
|
513
|
+ mov rsi, [rsp+8] ; argv[0]
|
|
514
|
+ syscall
|
|
515
|
+
|
|
516
|
+ mov rax, 1 ;write
|
|
517
|
+ mov rdi, 2 ; stderr
|
|
518
|
+ mov rsi, usage_err + 7
|
|
519
|
+ mov rdx, usage_err_sz - 7 ; usage opts
|
|
520
|
+ syscall
|
|
521
|
+
|
|
522
|
+ mov rax, 1
|
|
523
|
+ mov rdi, 2
|
|
524
|
+ mov rsi, chr_list + 2 ; \n
|
|
525
|
+ mov rdx, 1
|
|
526
|
+ syscall
|
|
527
|
+
|
|
528
|
+ mov rax, 0x3c ; exit
|
|
529
|
+ mov rdi, 1
|
|
530
|
+ syscall
|
|
531
|
+%undef heap_size
|
|
532
|
+%undef elf_file
|
|
533
|
+%undef bf_source
|
|
534
|
+
|
|
535
|
+; Init a writable memory map
|
|
536
|
+; len in rsi
|
|
537
|
+; ret : r14 map size
|
|
538
|
+; r15 map addr
|
|
539
|
+initmap:
|
|
540
|
+ mov r14, rsi
|
|
541
|
+ mov rax, 0x9 ;mmap
|
|
542
|
+ xor rdi, rdi ;addr
|
|
543
|
+ ; rsi is len
|
|
544
|
+ mov rdx, (0x1|0x2) ;PROT_READ | PROT_WRITE
|
|
545
|
+ mov r10, (0x2 | 0x20) ;flags MAP_PRIVATE | MAP_ANONYMOUS
|
|
546
|
+ mov r8, -1 ;fd
|
|
547
|
+ xor r9, r9
|
|
548
|
+ syscall
|
|
549
|
+ cmp rax, 0
|
|
550
|
+ jle .err
|
|
551
|
+ mov r15, rax
|
|
552
|
+ ret
|
|
553
|
+ .err:
|
|
554
|
+ mov rax, 0x3c
|
|
555
|
+ mov rdi, 0x2
|
|
556
|
+ syscall
|
|
557
|
+; resize the memory map
|
|
558
|
+; addr in r15 (0 if init)
|
|
559
|
+; len in r14
|
|
560
|
+; inc size in bytes in r10
|
|
561
|
+mremap:
|
|
562
|
+ mov rax, 0x19 ;mremap
|
|
563
|
+ mov rdi, r15 ;addr
|
|
564
|
+ mov rsi, r14 ;oldlen
|
|
565
|
+ mov rdx, rsi
|
|
566
|
+ add rdx, MAP_INC_SIZE ; newlen
|
|
567
|
+ xor r10, r10 ; MAYMOVE
|
|
568
|
+ xor r11, r11
|
|
569
|
+ syscall
|
|
570
|
+ cmp rax, 0
|
|
571
|
+ jle .err
|
|
572
|
+ mov r15, rax
|
|
573
|
+ add r14, MAP_INC_SIZE
|
|
574
|
+ ret
|
|
575
|
+ .err:
|
|
576
|
+ mov rax, 0x3c
|
|
577
|
+ mov rdi, 0x3
|
|
578
|
+ syscall
|
|
579
|
+
|
|
580
|
+; JIT brainfuck compiler. Read bf code from fd and write
|
|
581
|
+; machine code in a dedicated anon map with PROT_READ | PROT_EXEC
|
|
582
|
+; Using heap to read file
|
|
583
|
+; args :
|
|
584
|
+; rax source fd
|
|
585
|
+; r14 map size
|
|
586
|
+; r15 map addr
|
|
587
|
+; ret :
|
|
588
|
+; rax map ptr
|
|
589
|
+; r15 map addr
|
|
590
|
+; r14 map size
|
|
591
|
+compile_bf:
|
|
592
|
+ ; Allocating growing heap to store various datas
|
|
593
|
+ ; heap start will be stored in r13
|
|
594
|
+%define fd [r13]
|
|
595
|
+%define map_ptr [r13+0x8]
|
|
596
|
+%define base_rsp [r13+0x10]
|
|
597
|
+%define chr_repeat [r13+0x18]
|
|
598
|
+%define line_count [r13+0x20]
|
|
599
|
+%define chr_count [r13+0x28]
|
|
600
|
+%define chr_buff_off 0x30
|
|
601
|
+%define chr_buff [r13+chr_buff_off]
|
|
602
|
+%define prev_chr_off 0x31
|
|
603
|
+%define prev_chr [r13+prev_chr_off]
|
|
604
|
+%define heap_size 0x32
|
|
605
|
+ push rax ; source fd
|
|
606
|
+
|
|
607
|
+ mov rax, 0xc ; brk
|
|
608
|
+ xor rdi, rdi
|
|
609
|
+ syscall
|
|
610
|
+
|
|
611
|
+ push rax ; heap start
|
|
612
|
+
|
|
613
|
+ mov rdi, rax
|
|
614
|
+ add rdi, heap_size ; new heap addr
|
|
615
|
+ mov rax, 0xc ; brk
|
|
616
|
+ syscall
|
|
617
|
+
|
|
618
|
+ pop rdi ; heap start
|
|
619
|
+ mov r13, rdi
|
|
620
|
+ pop rax ; source fd
|
|
621
|
+ mov fd, rax
|
|
622
|
+
|
|
623
|
+ ; init heap
|
|
624
|
+ mov byte prev_chr, 0
|
|
625
|
+ mov qword chr_count, 0
|
|
626
|
+ mov qword line_count, 0
|
|
627
|
+ mov qword chr_repeat, 1
|
|
628
|
+ mov base_rsp, rsp ; save rsp in heap
|
|
629
|
+
|
|
630
|
+ ; copy code map header
|
|
631
|
+ mov rdi, r15
|
|
632
|
+ mov rsi, bf_start
|
|
633
|
+ mov rdx, bf_start_sz
|
|
634
|
+ call code_cpy
|
|
635
|
+ mov map_ptr, rax ; new map ptr
|
|
636
|
+
|
|
637
|
+ ; read first char in prev_chr
|
|
638
|
+ xor rax, rax ;read
|
|
639
|
+ mov rdi, fd ; fd
|
|
640
|
+ mov rsi, r13
|
|
641
|
+ add rsi, prev_chr_off ; chr_prev
|
|
642
|
+ mov rdx, 1 ; read 1 byte
|
|
643
|
+ syscall
|
|
644
|
+ cmp rax, 0
|
|
645
|
+ jle .read_error
|
|
646
|
+
|
|
647
|
+ .readloop:
|
|
648
|
+ xor rax, rax ;read
|
|
649
|
+ mov rdi, fd ; fd
|
|
650
|
+ mov rsi, r13
|
|
651
|
+ add rsi, chr_buff_off ; buff byte
|
|
652
|
+ mov rdx, 1 ; read 1 byte
|
|
653
|
+ syscall
|
|
654
|
+ cmp rax, 0
|
|
655
|
+ je .endread
|
|
656
|
+ jl .read_error ; error
|
|
657
|
+
|
|
658
|
+ mov rax, chr_count ; chr counter
|
|
659
|
+ inc rax
|
|
660
|
+ mov chr_count, rax
|
|
661
|
+
|
|
662
|
+ mov al, chr_buff
|
|
663
|
+
|
|
664
|
+ ; arg for loop is not a repeat counter
|
|
665
|
+ cmp al, 0x5b ; '['
|
|
666
|
+ je .cmpchar
|
|
667
|
+ cmp al, 0x5d ; '['
|
|
668
|
+ je .cmpchar
|
|
669
|
+
|
|
670
|
+ cmp al, prev_chr
|
|
671
|
+ je .incnum ; same instruction, incrementing counter
|
|
672
|
+
|
|
673
|
+ .cmpchar:
|
|
674
|
+ mov rdi, map_ptr ; prepare to copy in code map
|
|
675
|
+ ; compare previous char and store current in prev
|
|
676
|
+ ; note : chr_repeat has to be reset by .nxtinstr
|
|
677
|
+ ; after jump
|
|
678
|
+ xchg prev_chr, al
|
|
679
|
+ cmp al, 0x3c ; '<'
|
|
680
|
+ je .lptr
|
|
681
|
+ cmp al, 0x3e ; '>'
|
|
682
|
+ je .rptr
|
|
683
|
+ cmp al, 0x2b ; '+'
|
|
684
|
+ je .incval
|
|
685
|
+ cmp al, 0x2d ; '-'
|
|
686
|
+ je .decval
|
|
687
|
+ cmp al, 0x2e ; '.'
|
|
688
|
+ je .wrval
|
|
689
|
+ cmp al, 0x2c ; ','
|
|
690
|
+ je .rdval
|
|
691
|
+ cmp al, 0x5b ; '['
|
|
692
|
+ je .loopstart
|
|
693
|
+ cmp al, 0x5d ; ']'
|
|
694
|
+ je .loopend
|
|
695
|
+
|
|
696
|
+ cmp al, 0x0a ; '\n'
|
|
697
|
+ je .line
|
|
698
|
+
|
|
699
|
+ ; chr is not an instruction, printing them
|
|
700
|
+ ; on stderr
|
|
701
|
+ mov chr_buff, al
|
|
702
|
+ mov rcx, chr_repeat
|
|
703
|
+ .errchr:
|
|
704
|
+ push rcx
|
|
705
|
+ mov rax, 1 ; write
|
|
706
|
+ mov rdi, 2 ; stderr
|
|
707
|
+ mov rsi, r13
|
|
708
|
+ add rsi, chr_buff_off ; heap buff
|
|
709
|
+ mov rdx, rax ; sz 1
|
|
710
|
+ syscall
|
|
711
|
+ pop rcx
|
|
712
|
+ loop .errchr
|
|
713
|
+ jmp .nxtinstr
|
|
714
|
+
|
|
715
|
+ .line: ; increment line counter in heap
|
|
716
|
+ mov rax, line_count
|
|
717
|
+ add rax, chr_repeat
|
|
718
|
+ mov line_count, rax
|
|
719
|
+ mov rcx, chr_repeat
|
|
720
|
+ jmp .errchr ; print the newline
|
|
721
|
+
|
|
722
|
+
|
|
723
|
+
|
|
724
|
+ ; following ref copy assume rdi to be map_ptr
|
|
725
|
+ .incval:
|
|
726
|
+ mov rsi, bf_incval
|
|
727
|
+ mov rdx, bf_incval_sz
|
|
728
|
+ push rdx
|
|
729
|
+ jmp .callcpy
|
|
730
|
+ .decval:
|
|
731
|
+ mov rsi, bf_decval
|
|
732
|
+ mov rdx, bf_decval_sz
|
|
733
|
+ push rdx
|
|
734
|
+ jmp .callcpy
|
|
735
|
+ .lptr:
|
|
736
|
+ mov rsi, bf_decptr
|
|
737
|
+ mov rdx, bf_decptr_sz
|
|
738
|
+ push rdx
|
|
739
|
+ jmp .callcpy
|
|
740
|
+ .rptr:
|
|
741
|
+ mov rsi, bf_incptr
|
|
742
|
+ mov rdx, bf_incptr_sz
|
|
743
|
+ push rdx
|
|
744
|
+ jmp .callcpy
|
|
745
|
+ .wrval:
|
|
746
|
+ mov rsi, bf_writeval
|
|
747
|
+ mov rdx, bf_writeval_sz
|
|
748
|
+ push rdx
|
|
749
|
+ jmp .callcpy
|
|
750
|
+ .rdval:
|
|
751
|
+ mov rsi, bf_readval
|
|
752
|
+ mov rdx, bf_readval_sz
|
|
753
|
+ push rdx
|
|
754
|
+ jmp .callcpy
|
|
755
|
+ .loopstart:
|
|
756
|
+ mov rbx, map_ptr
|
|
757
|
+ sub rbx, r15
|
|
758
|
+ push rbx ; loop offset from map start
|
|
759
|
+ ;push qword map_ptr ; ret addr
|
|
760
|
+ mov rsi, bf_loopstart
|
|
761
|
+ mov rdx, bf_loopstart_sz
|
|
762
|
+ push rdx
|
|
763
|
+ jmp .callcpy
|
|
764
|
+ .loopend:
|
|
765
|
+ cmp rsp, base_rsp
|
|
766
|
+ je .loop_err_miss_open
|
|
767
|
+ mov rsi, bf_loopend
|
|
768
|
+ mov rdx, bf_loopend_sz
|
|
769
|
+ push rdx
|
|
770
|
+ call code_cpy
|
|
771
|
+ mov map_ptr, rax ; rax is map_ptr
|
|
772
|
+ pop rdx
|
|
773
|
+ sub rax, rdx
|
|
774
|
+ add rax, 2 ;arg addr in code map
|
|
775
|
+ pop rbx ; loop_start code offset
|
|
776
|
+ mov [rax], rbx ; loop end jump to start
|
|
777
|
+ mov rax, map_ptr
|
|
778
|
+ sub rax, r15 ; loop end offset in map
|
|
779
|
+ add rbx, r15 ; loop start addr
|
|
780
|
+ mov [rbx+2], rax ; start jump to end
|
|
781
|
+ jmp .nxtinstr
|
|
782
|
+
|
|
783
|
+ .callcpy:
|
|
784
|
+ call code_cpy
|
|
785
|
+ mov map_ptr, rax
|
|
786
|
+ ; set the 1st instr rgs in the mapping
|
|
787
|
+ ; and reinit chr_repeat
|
|
788
|
+ pop rdx
|
|
789
|
+ sub rax, rdx
|
|
790
|
+ add rax, 2 ; arg addr in code map
|
|
791
|
+ mov rbx, chr_repeat
|
|
792
|
+ mov [rax], rbx
|
|
793
|
+ .nxtinstr:
|
|
794
|
+ ; reinit chr_repeat
|
|
795
|
+ mov qword chr_repeat, 1
|
|
796
|
+ jmp .readloop
|
|
797
|
+
|
|
798
|
+ .incnum:
|
|
799
|
+ ; same instruction found incrementing
|
|
800
|
+ ; chr_repeat
|
|
801
|
+ mov rbx, chr_repeat
|
|
802
|
+ inc rbx
|
|
803
|
+ jc .incoverflow
|
|
804
|
+ mov chr_repeat, rbx
|
|
805
|
+ jmp .readloop
|
|
806
|
+
|
|
807
|
+ .incoverflow:
|
|
808
|
+ dec rbx
|
|
809
|
+ mov chr_repeat, rbx
|
|
810
|
+ jmp .cmpchar
|
|
811
|
+
|
|
812
|
+ jmp .readloop
|
|
813
|
+ .loop_err_miss_open:
|
|
814
|
+ ; miss_open_err
|
|
815
|
+ mov rax, 1
|
|
816
|
+ mov rdi, 2 ; stderr
|
|
817
|
+ mov rsi, miss_open
|
|
818
|
+ mov rdx, miss_open_sz
|
|
819
|
+ syscall
|
|
820
|
+ jmp .exit_error
|
|
821
|
+
|
|
822
|
+ .read_error:
|
|
823
|
+ xor rax, rax
|
|
824
|
+ inc rax ; write
|
|
825
|
+ mov rsi, 2 ; stderr
|
|
826
|
+ mov rdi, read_error
|
|
827
|
+ mov rdx, read_error_sz
|
|
828
|
+ syscall
|
|
829
|
+ jmp .exit_error
|
|
830
|
+
|
|
831
|
+ .exit_error:
|
|
832
|
+ mov rax, 1
|
|
833
|
+ mov rdi, 2
|
|
834
|
+ mov rsi, chr_list + 2
|
|
835
|
+ mov rdx, 1
|
|
836
|
+ syscall
|
|
837
|
+ mov rax, 0x3c
|
|
838
|
+ mov rdi, 0x11
|
|
839
|
+ syscall
|
|
840
|
+
|
|
841
|
+ .endread: ; EOF reached
|
|
842
|
+ ; fake \0 read to process prev_chr
|
|
843
|
+ mov byte chr_buff, 0
|
|
844
|
+ mov bl, prev_chr
|
|
845
|
+ test bl, bl
|
|
846
|
+ jnz .cmpchar
|
|
847
|
+ ; prevchar is 0 copying exit in code map
|
|
848
|
+ .end_compile:
|
|
849
|
+ mov rdi, map_ptr
|
|
850
|
+ mov rsi, bf_exit
|
|
851
|
+ mov rdx, bf_exit_sz
|
|
852
|
+ call code_cpy
|
|
853
|
+ mov map_ptr, rax
|
|
854
|
+
|
|
855
|
+ ; restoring stack
|
|
856
|
+ mov rsp, base_rsp
|
|
857
|
+ push qword map_ptr
|
|
858
|
+
|
|
859
|
+ ; restore heap
|
|
860
|
+ mov rax, 0xc ; brk
|
|
861
|
+ mov rdi, r13
|
|
862
|
+ syscall
|
|
863
|
+
|
|
864
|
+ pop rax ; return map_ptr
|
|
865
|
+ ret
|
|
866
|
+
|
|
867
|
+%undef fd
|
|
868
|
+%undef map_ptr
|
|
869
|
+%undef base_rsp
|
|
870
|
+%undef chr_buff
|
|
871
|
+%undef prev_chr
|
|
872
|
+%undef heap_size
|
|
873
|
+
|
|
874
|
+; Copy bf code from data to map
|
|
875
|
+; Use :
|
|
876
|
+; r15 map start
|
|
877
|
+; r14 map size
|
|
878
|
+; rdi map ptr
|
|
879
|
+; rsi code ptr
|
|
880
|
+; rdx code size in bytes
|
|
881
|
+; ret :
|
|
882
|
+; rax : new map ptr
|
|
883
|
+code_cpy:
|
|
884
|
+ push rdx
|
|
885
|
+ mov rax, rdi
|
|
886
|
+ sub rax, r15 ; used len in map
|
|
887
|
+ push rax
|
|
888
|
+ mov rcx, rdx
|
|
889
|
+ cmp rax, r14 ; rax is future len (after copy)
|
|
890
|
+ jle .copy
|
|
891
|
+ ; resize
|
|
892
|
+ push rsi ; save code_ptr
|
|
893
|
+ call mremap
|
|
894
|
+ pop rsi ; new code_ptr
|
|
895
|
+ .copy:
|
|
896
|
+ mov rdi, r15
|
|
897
|
+ pop rax
|
|
898
|
+ add rdi, rax ; new map ptr
|
|
899
|
+ pop rcx ; size in words to write
|
|
900
|
+ cld ; clear DF
|
|
901
|
+ .copyloop:
|
|
902
|
+ movsb
|
|
903
|
+ loop .copyloop
|
|
904
|
+ mov rax, rdi
|
|
905
|
+ .ret:
|
|
906
|
+ ret
|