461 lines
9.6 KiB
NASM
461 lines
9.6 KiB
NASM
;freebsd = 1 ;uncomment for FreeBSD-specific changes
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format ELF64
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public _start
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.data? fix section ".bss" writeable align 4
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.data fix section ".data" writeable align 4
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.const fix section ".const" align 4
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.code fix section ".text" executable align 16
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offset fix
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ptr fix
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struc label type {
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label . type }
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extrn lzma_compress
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extrn lzma_set_dict_size
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.data?
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infilename dq ?
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outfilename dq ?
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infile dq ?
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outfile dq ?
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inptr dq ?
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workmem dq ?
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insize dd ?
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outsize dd ?
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lzma_dictsize dd ?
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indelta dd ?
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strucstat rq 18
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if defined freebsd
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st_atime_offset = 24
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st_mtime_offset = 40
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st_birthtime_offset = 104
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st_size_offset = 72
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else
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st_atime_offset = 72
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st_mtime_offset = 88
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;st_birthtime_offset not defined
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st_size_offset = 48
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end if
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public environ
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environ dq ?
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public __progname
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__progname dq ?
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ct1 db 256 dup (?)
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ctn dd ?
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cti db ?
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.const
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usage_str db 'Written by diamond in 2006, 2007 specially for KolibriOS',13,10
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db 'LZMA compression library is copyright (c) 1999-2005 by Igor Pavlov',13,10
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db 13,10
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db 'Usage: kerpack <infile> [<outfile>]',13,10
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usage_len = $ - offset usage_str
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errload_str db 'Cannot load input file',13,10
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errload_len = $ - offset errload_str
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outfileerr_str db 'Cannot save output file',13,10
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outfileerr_len = $ - offset outfileerr_str
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nomem_str db 'No memory',13,10
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nomem_len = $ - offset nomem_str
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too_big_str db 'failed, output is greater than input.',13,10
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too_big_len = $ - too_big_str
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compressing_str db 'Compressing ... '
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compressing_len = $ - compressing_str
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.data
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done_str db 'OK! Compression ratio: '
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ratio dw '00'
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db '%',13,10,13,10
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done_len = $ - done_str
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use_lzma = 1
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use_no_calltrick = 0
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use_calltrick1 = 40h
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use_calltrick2 = 80h
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method db 1
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.code
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; Write string from [rsi] of rdx bytes.
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write_string:
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; 1. Align stack on 16 bytes.
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push rdi
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; 2. Set rdi to 1 = descriptor for stdout.
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xor edi, edi
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inc edi
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; 3. Do system call.
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call write
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; 4. Restore stack and return.
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pop rdi
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ret
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; Write string from [rsi] of rdx bytes and exit. Note that main code jumps (not calls) here,
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; so we should not align the stack.
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write_exit:
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; 1. Call prev func.
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call write_string
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; 2. Do system call for exit.
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; Note that this can be used as independent proc jumped (not called) to.
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doexit:
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xor edi, edi
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inc edi
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call exit
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; Main procedure.
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_start:
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; 1. Parse command line.
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; Linux: [rsp] = argc, rsp+8 = argv
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; FreeBSD: [rdi] = argc, rdi+8 = argv
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; 1a. Load argc and argv to registers,
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; skip first argument (which is always program name)
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if defined freebsd
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mov ecx, [rdi] ; ecx = argc
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add rdi, 16 ; rdi = &argv[1]
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else
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mov ecx, [rsp] ; ecx = argc
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lea rdi, [rsp+16] ; rdi = &argv[1]
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end if
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; 1b. Test for first filename parameter. If no, goto step 2.
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call get_file_name
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jz usage
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; 1c. We got input file name, save it.
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; Assume that output file name is the same; if no, we will rewrite it in step 1d.
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mov [infilename], rax
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mov [outfilename], rax
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; 1d. Test for second filename parameter. If yes, rewrite assumption in step 1c and check that there are no 3rd parameter.
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call get_file_name
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jz @f
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mov [outfilename], rax
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call get_file_name
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jnz usage
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@@:
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; 1e. Parsing is done, process to step 3.
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jmp short cont
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; 2. No arguments or too many arguments given; write message and exit.
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usage:
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push usage_len
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pop rdx
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mov rsi, offset usage_str
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jmp write_exit
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cont:
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; 4. Load the input file.
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; 4a. Do system call for stat - get file times and file size.
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mov rdi, [infilename]
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mov rsi, offset strucstat
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mov r13, rsi
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call stat
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; 4b. Test result; if not 0 (0 is OK), goto 4e.
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test rax, rax
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jnz short infileerr
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; 4c. Do system call for open.
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mov rdi, [infilename]
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mov rsi, offset open_mode
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call fopen
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; 4d. Test result; if not NULL, goto 4f.
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test rax, rax
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jnz short inopened
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infileerr:
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; 4e. Say error and abort.
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push errload_len
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pop rdx
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mov rsi, offset errload_str
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jmp write_exit
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inopened:
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mov r12, rax
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; 4f. Check that the size is nonzero and less than 4G.
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mov edi, [r13+st_size_offset]
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test edi, edi
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jz short infileerr
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cmp dword [r13+st_size_offset+4], 0
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jnz short infileerr
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; 4g. Allocate memory for the input file.
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mov [insize], edi
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call malloc
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test rax, rax
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jz nomem
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mov [infile], rax
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; 4g. Read the input file to the allocated memory.
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mov rdi, rax
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push 1
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pop rsi
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mov edx, [r13+st_size_offset]
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mov rcx, r12
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call fread
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; 4h. Test result; must be equal to file size.
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cmp eax, [r13+st_size_offset]
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jnz infileerr
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; 4i. Close the input file.
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mov rdi, r12
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call fclose
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; 5. Calculate maximum size of the output.
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mov edi, [insize]
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shr edi, 3
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add edi, [insize]
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add edi, 400h ; should be enough for header
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mov r12d, edi
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; 6. Allocate memory for two copies of maximum output.
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; 6a. Do system call.
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call malloc
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; 6b. Test return value. If ok, goto 6d.
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test rax, rax
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jnz short outmemok
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; 6c. No memory; say error and exit.
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nomem:
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push nomem_len
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pop rdx
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mov rsi, offset nomem_str
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jmp write_exit
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; 6d. Remember allocated memory address.
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outmemok:
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mov [outfile], rax
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; 8. Determine and set lzma_dict_size.
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push 18h
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pop rdi
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call lzma_set_dict_size
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; 9. Allocate lzma_workmem.
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mov edi, (1 shl 18h) * 19 / 2 + 509000h
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call malloc
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test rax, rax
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jz nomem
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mov [workmem], rax
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; 10. Say another 'hi'.
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push compressing_len
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pop rdx
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mov rsi, offset compressing_str
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call write_string
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; 11. Do work.
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; find jump to 32-bit code
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mov rdi, [infile]
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dec rdi
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@@:
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inc rdi
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cmp dword [rdi], 0E88EE08Eh ; mov fs,ax/mov gs,ax
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jnz @b
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cmp dword [rdi+4], 00BCD08Eh ; mov ss,ax/mov esp,00xxxxxx
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jnz @b
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add rdi, 11
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mov [inptr], rdi
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sub rdi, [infile]
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mov [indelta], edi
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mov eax, [insize]
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mov ebx, eax
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add eax, 0x10000
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mov [loader_base+..loader_patch3+2], eax
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sub ebx, edi
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mov [insize], ebx
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call preprocess_calltrick2
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mov al, [cti]
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mov [loader_base+loader_patch5-1], al
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mov eax, [ctn]
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mov [loader_base+loader_patch4+1], eax
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mov esi, [indelta]
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add rsi, [outfile]
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add rsi, loader_size - 5
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mov rdi, [inptr]
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mov edx, [insize]
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mov rcx, [workmem]
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call lzma_compress
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mov edx, [indelta]
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add eax, loader_size-5
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mov [loader_base+loader_patch1+6], eax
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add eax, edx
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mov [outsize], eax
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mov eax, edx
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add rax, [outfile]
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mov ecx, [rax + loader_size - 4]
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bswap ecx
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mov [loader_base+loader_patch2+4], ecx
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add edx, 0x10000
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mov [loader_base+loader_patch1+1], edx
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mov rsi, [infile]
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mov rdi, [outfile]
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mov ecx, [indelta]
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rep movsb
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mov rsi, loader_base
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mov ecx, loader_size
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rep movsb
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mov eax, [outsize]
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cmp eax, [insize]
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jb short packed_ok
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push too_big_len
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pop rdx
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mov rsi, offset too_big_str
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jmp write_exit
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packed_ok:
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; 12. Main work is done. Free lzma_workmem.
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mov rdi, [workmem]
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call free
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; 13. Set header
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mov eax, [outsize]
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mov ecx, 100
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mul ecx
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div [insize]
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mov cl, 10
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div cl
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add ax, '00'
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mov [ratio], ax
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push done_len
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pop rdx
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mov rsi, offset done_str
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call write_string
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; 14. Save the output file.
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; 14a. Do system call for open.
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mov rdi, [outfilename]
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mov rsi, create_mode
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call fopen
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; 14b. Test for success; if yes, goto 14d.
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test rax, rax
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jnz short @f
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; 14c. Say error and exit.
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outerr:
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push outfileerr_len
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pop rdx
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mov rsi, offset outfileerr_str
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jmp write_exit
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; 14d. Do system call for write.
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@@:
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mov r12, rax
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mov rdi, [outfile]
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mov esi, [outsize]
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push 1
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pop rdx
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mov rcx, r12
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call fwrite
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test eax, eax
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jz short outerr
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; 14e. Close output file.
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mov rdi, r12
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call fclose
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; 15. Exit.
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xor edi, edi
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call exit
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; Scan command line, skipping possible options, and return first non-option
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; ecx is number of arguments left, rdi points to first new argument (updated by func)
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; After the call: ZF set if no arguments left, otherwise rax points to the arg.
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get_file_name:
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; 1. Test whether there are still arguments. If no, goto 5; note ZF is set.
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dec ecx
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jz @@end
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; 2. Get the new arg, advance rdi (ecx was decreased in step 1).
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mov rax, [rdi]
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add rdi, 8
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; 5. No arguments (ZF set) or normal argument (ZF cleared); return.
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@@end:
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ret
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pack_calltrick_fail:
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xor eax, eax
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xor ebx, ebx
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mov [ctn], eax
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ret
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preprocess_calltrick2:
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; restore input
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mov rsi, [infile]
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; input preprocessing
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push rax
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mov edi, [insize]
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add edi, edi
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call malloc
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pop rcx
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test rax, rax
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jz pack_calltrick_fail
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mov rdi, offset ct1
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xchg rax, rbx
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xor eax, eax
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push rdi
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mov ecx, 256/4
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rep stosd
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pop rdi
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mov ecx, [insize]
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mov rsi, [inptr]
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xchg eax, edx
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push rbx
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input_pre2:
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lodsb
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@@:
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cmp al, 0Fh
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jnz short ip1
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dec ecx
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jz short input_pre_done2
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lodsb
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cmp al, 80h
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jb short @b
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cmp al, 90h
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jb short @f
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ip1:
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sub al, 0E8h
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cmp al, 1
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ja short input_pre_cont2
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@@:
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cmp ecx, 5
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jb short input_pre_done2
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lodsd
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add eax, esi
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sub eax, dword ptr [inptr]
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cmp eax, [insize]
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jae short xxx2
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cmp eax, 1000000h
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jae short xxx2
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sub ecx, 4
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bswap eax
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mov [rsi-4], eax
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inc edx
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mov [rbx], rsi
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add rbx, 8
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jmp short input_pre_cont2
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xxx2: sub rsi, 4
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movzx eax, byte ptr [rsi]
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mov byte ptr [rax+rdi], 1
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input_pre_cont2:
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loop input_pre2
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input_pre_done2:
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mov [ctn], edx
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pop rdx
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xor eax, eax
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mov ecx, 256
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repnz scasb
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jnz pack_calltrick_fail
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not cl
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mov [cti], cl
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@@:
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cmp rbx, rdx
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jz @f
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sub rbx, 8
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mov rax, [rbx]
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mov [rax-4], cl
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jmp @b
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@@:
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push rax
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mov rdi, rbx
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call free
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pop rax
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ret
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extrn exit
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extrn fopen
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extrn fread
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extrn fwrite
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extrn fclose
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extrn fseek
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extrn ftell
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extrn malloc
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extrn free
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extrn write
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extrn utimes
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extrn stat
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open_mode db "rb",0
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create_mode db "wb",0
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.data
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loader_base:
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use32
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org 0
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include 'loader_lzma.asm'
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