2018-06-05 14:34:03 -04:00
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;*
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;* x86_64-bios/fs.inc
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;*
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2020-01-13 12:55:08 -05:00
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;* Copyright (C) 2017 - 2020 bzt (bztsrc@gitlab)
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2018-06-05 14:34:03 -04:00
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;*
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;* Permission is hereby granted, free of charge, to any person
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;* obtaining a copy of this software and associated documentation
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;* files (the "Software"), to deal in the Software without
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;* restriction, including without limitation the rights to use, copy,
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;* modify, merge, publish, distribute, sublicense, and/or sell copies
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;* of the Software, and to permit persons to whom the Software is
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;* furnished to do so, subject to the following conditions:
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;*
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;* The above copyright notice and this permission notice shall be
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;* included in all copies or substantial portions of the Software.
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;*
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;* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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;* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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;* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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;* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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;* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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;* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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;* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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;* DEALINGS IN THE SOFTWARE.
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;*
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;* This file is part of the BOOTBOOT Protocol package.
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;* @brief Filesystem drivers for initial ramdisk.
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;*
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;*********************************************************************
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;* File System Drivers *
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;*********************************************************************
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USE32
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fsdrivers:
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dw fsz_initrd
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dw cpio_initrd
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dw tar_initrd
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dw sfs_initrd
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dw jamesm_initrd
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dw 0
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; ----------- FS/Z ----------
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2018-11-09 05:59:14 -05:00
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; Find the kernel on initrd (only supports 4096 logical sector sizes)
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2018-06-05 14:34:03 -04:00
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; IN: esi: initrd pointer, ecx: initrd end, edi: kernel filename
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; OUT: On Success
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; esi: pointer to the first byte, ecx: size in bytes
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; On Error
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; ecx: 0
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fsz_initrd:
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mov ebx, ecx
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xor ecx, ecx
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; FS/Z superblock
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2018-11-09 05:59:14 -05:00
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cmp dword [esi+512], 'FS/Z' ; FSZ_SuperBlock.magic
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jne .nolib
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; encrypted initrd?
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cmp dword [esi+708], 0 ; FSZ_SuperBlock.enchash
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jz .noenc
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mov al, byte [esi+518] ; FSZ_SuperBlock.flags
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shr al, 2
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and al, 7
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or al, al
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jz @f
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prot_realmode
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real_print loader.name
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real_print panic
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mov esi, nocipher
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call real_printfunc
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real_protmode
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jmp .err
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@@: push edi
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prot_realmode
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.passagain: real_print passphrase
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; get passphrase from user
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mov di, pass
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mov byte [di], 0
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.getchar: call real_getchar
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cmp al, 27 ; Esc
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jne @f
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real_print clrdecrypt
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jmp .err
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@@: cmp al, 8 ; Backspace
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jne @f
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cmp di, pass
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je .getchar
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mov byte [di], 0
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dec di
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jmp .getchar
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@@: cmp al, 13 ; Enter
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je .gotpass
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cmp al, 10
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je .gotpass
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cmp al, ' '
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jb .getchar
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cmp di, pass+255
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jge .getchar
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mov word [di], ax
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inc di
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jmp .getchar
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.gotpass: push esi
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real_protmode
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mov esi, pass
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mov ecx, edi
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sub ecx, esi
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mov dword [pl], ecx
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call crc32_calc
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prot_realmode
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pop esi
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cmp dword [esi+708], edx
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je .passok
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real_print badpass
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jmp .passagain
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.passok: real_print decrypting
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real_protmode
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; decrypt initrd
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call sha_init
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mov ecx, dword [pl]
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mov ebx, pass
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call sha_upd
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mov ecx, 6
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mov ebx, esi
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add ebx, 512 ; FSZ_SuperBlock.magic
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call sha_upd
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mov edi, chk
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call sha_final
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mov edi, esi
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add edi, 680 ; FSZ_SuperBlock.encrypt
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mov cl, 28
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xor ebx, ebx
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@@: mov al, byte [edi]
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xor byte [chk+ebx], al
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xor eax, eax
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stosb
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inc ebx
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dec cl
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jnz @b
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stosd
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call sha_init
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mov ecx, 28
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mov ebx, chk
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call sha_upd
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mov edi, iv
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call sha_final
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mov eax, dword [esi+528] ; FSZ_SuperBlock.numsec
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mov dword [pl], eax
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xor eax, eax
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inc eax
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mov dword [_i], eax ; skip first sector
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mov ebx, esi
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add ebx, 4096
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push esi
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.decrypt: mov esi, iv
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mov edi, chk
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xor ecx, ecx
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mov cl, 32/4
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repnz movsd
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mov cx, 4096
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.nextblk: mov al, bl
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and al, 31
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jnz @f
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push ebx
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push ecx
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call sha_init
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mov ecx, 32
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mov ebx, chk
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call sha_upd
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mov ecx, 4
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mov ebx, _i
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call sha_upd
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mov edi, chk
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call sha_final
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pop ecx
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pop ebx
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mov edx, edi
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@@: mov al, byte [edx]
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2018-11-09 09:12:33 -05:00
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xor byte [ebx], al
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mov al, byte [edx+32]
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2018-11-09 05:59:14 -05:00
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xor byte [ebx], al
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inc ebx
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inc edx
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dec cx
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jnz .nextblk
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inc dword [_i]
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mov eax, dword [_i]
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cmp eax, dword [pl]
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jne .decrypt
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mov esi, dword [esp]
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add esi, 512
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mov ecx, 508
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call crc32_calc
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pop esi
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mov dword [esi+1020], edx ; FSZ_SuperBlock.chksum
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; clear console message
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prot_realmode
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real_print clrdecrypt
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real_protmode
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pop edi
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2018-06-05 14:34:03 -04:00
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; get root dir inode
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2019-03-02 19:57:18 -05:00
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.noenc: mov dword [_i], 1024
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mov al, byte [esi+518] ; FSZ_SuperBlock.flags
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bt ax, 0 ; FSZ_FLAG_BIGINODE?
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jnc @f
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mov dword [_i], 2048
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@@: mov eax, dword [esi+560] ; FSZ_SuperBlock.rootdirfid
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2018-06-05 14:34:03 -04:00
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shl eax, 12
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add esi, eax
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cmp dword [esi], 'FSIN'
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je @f
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.nolib: mov esi, nolib
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.err: xor ecx, ecx
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ret
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.nocore: mov esi, nocore
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jmp .err
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@@: ; it has inlined data?
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2019-03-02 19:57:18 -05:00
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.again: mov eax, dword [esi+448] ; FSZ_Inode.sec
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add esi, dword[_i] ; FSZ_Inode.[big|small].inlinedata
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2018-06-05 14:34:03 -04:00
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cmp dword [esi], 'FSDR'
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je .srchdir
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; no, locate the data
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mov ecx, dword [esi]
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shl eax, 12
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mov esi, dword [bootboot.initrd_ptr]
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add esi, eax
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cmp dword [esi], 'FSDR'
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je .srchdir
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; inlined sector directory or list?
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shl ecx, 12
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mov esi, dword [bootboot.initrd_ptr]
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add esi, ecx
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cmp dword [esi], 'FSDR'
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jne .nolib
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.srchdir: ; find sys/
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mov ecx, dword [esi+16] ; FSZ_DirEntHeader.numentries
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mov eax, dword [edi]
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@@: add esi, 128 ; directories than
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cmp dword [esi+17], eax
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je @f
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dec ecx
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jnz @b
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jmp .nolib
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; found, get it's inode
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@@:
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mov eax, dword [esi]
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shl eax, 12
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mov esi, dword [bootboot.initrd_ptr]
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add esi, eax
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cmp dword [esi], 'FSIN'
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jne .nolib
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;this is not bullet proof
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add edi, 4
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cmp byte [edi+3], '/'
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je .again
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2018-11-09 05:59:14 -05:00
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2018-06-05 14:34:03 -04:00
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; it has inlined data?
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2019-03-02 19:57:18 -05:00
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mov eax, dword [esi+448] ; FSZ_Inode.sec
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add esi, dword[_i] ; FSZ_Inode.[big|small].inlinedata
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2018-06-05 14:34:03 -04:00
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cmp dword [esi], 'FSDR'
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je .srchcore
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; no, locate the data
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mov ecx, dword [esi]
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shl eax, 12
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mov esi, dword [bootboot.initrd_ptr]
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add esi, eax
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cmp dword [esi], 'FSDR'
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je .srchdir
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; inlined sector directory or list?
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shl ecx, 12
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mov esi, dword [bootboot.initrd_ptr]
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add esi, ecx
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cmp dword [esi], 'FSDR'
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jne .nolib
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.srchcore: ; find filename
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mov ecx, dword [esi+16] ; FSZ_DirEntHeader.numentries
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;filename, 8 characters supported
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mov eax, dword [edi]
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mov edx, dword [edi+4]
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@@: add esi, 128
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cmp dword [esi+21], edx
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jne .not
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cmp dword [esi+17], eax
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je @f
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.not: dec ecx
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jnz @b
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jmp .nocore
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; found, get it's inode
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@@: mov eax, dword [esi]
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shl eax, 12
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mov esi, dword [bootboot.initrd_ptr]
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add esi, eax
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cmp dword [esi], 'FSIN'
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jne .nocore
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; get data
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mov eax, dword [esi+448] ; FSZ_Inode.sec
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mov ecx, dword [esi+464] ; FSZ_Inode.size
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2018-11-22 16:36:04 -05:00
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mov bl, byte [esi+488] ; FSZ_Inode.flags
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2018-06-05 14:34:03 -04:00
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; inline
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cmp bl, 0FFh ; FSZ_IN_FLAG_INLINE
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jne @f
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2019-03-02 19:57:18 -05:00
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add esi, dword[_i] ; FSZ_Inode.[big|small].inlinedata
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2018-06-05 14:34:03 -04:00
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ret
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; direct data block
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@@: or bl, bl ; FSZ_IN_FLAG_DIRECT
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je .load
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; inlined sector directory or sector list
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@@: cmp bl, 07Fh ; FSZ_IN_FLAG_SDINLINE
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je @f
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cmp bl, 080h ; FSZ_IN_FLAG_SECLIST
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je @f
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cmp bl, 1 ; FSZ_IN_FLAG_SD
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jne .nocore
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shl eax, 12
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mov esi, dword [bootboot.initrd_ptr]
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add esi, eax
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mov eax, dword [esi] ; first FSZ_SectorList.sec
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jmp .load
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2019-03-02 19:57:18 -05:00
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@@: add esi, dword[_i] ; FSZ_Inode.[big|small].inlinedata
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2018-06-05 14:34:03 -04:00
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; sector directory at esi, file size in ecx
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mov eax, dword [esi] ; first FSZ_SectorList.sec
|
|
|
|
|
.load: shl eax, 12
|
|
|
|
|
mov esi, dword [bootboot.initrd_ptr]
|
|
|
|
|
add esi, eax
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
; ----------- cpio ----------
|
|
|
|
|
; Find the kernel on initrd
|
|
|
|
|
; IN: esi: initrd pointer, ecx: initrd end, edi: kernel filename
|
|
|
|
|
; OUT: On Success
|
|
|
|
|
; esi: pointer to the first byte, ecx: size in bytes
|
|
|
|
|
; On Error
|
|
|
|
|
; ecx: 0
|
|
|
|
|
cpio_initrd:
|
|
|
|
|
; upper bound
|
|
|
|
|
mov ebx, ecx
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
; strlen(kernel)
|
|
|
|
|
mov eax, edi
|
|
|
|
|
or eax, eax
|
|
|
|
|
jz .err
|
|
|
|
|
cmp byte [eax], 0
|
|
|
|
|
jz .err
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
@@: inc ecx
|
|
|
|
|
inc eax
|
|
|
|
|
cmp byte [eax], 0
|
|
|
|
|
jnz @b
|
|
|
|
|
mov dword [.ks], ecx
|
|
|
|
|
; while(ptr.magic=='070707' && ptr<limit)
|
|
|
|
|
.next: cmp esi, ebx
|
|
|
|
|
jae .err
|
|
|
|
|
mov eax, '0707'
|
|
|
|
|
cmp dword [esi], eax ; cpio magic
|
|
|
|
|
jne .err
|
|
|
|
|
cmp word [esi+4], ax ; hpodc
|
|
|
|
|
je @f
|
|
|
|
|
cmp word [esi+4], '01' ; newc
|
|
|
|
|
je .newc
|
|
|
|
|
cmp word [esi+4], '02' ; crc
|
|
|
|
|
je .newc
|
|
|
|
|
.err: xor ecx, ecx
|
|
|
|
|
ret
|
|
|
|
|
@@: mov eax, esi ; filename len
|
|
|
|
|
add eax, 8*6+11
|
|
|
|
|
mov ecx, 6
|
|
|
|
|
call prot_oct2bin
|
|
|
|
|
mov dword [.ns], eax
|
|
|
|
|
mov eax, esi ; filesize
|
|
|
|
|
add eax, 8*6+11+6
|
|
|
|
|
mov ecx, 11
|
|
|
|
|
call prot_oct2bin
|
|
|
|
|
mov dword [.fs], eax
|
|
|
|
|
push esi ; name equals?
|
|
|
|
|
push edi
|
|
|
|
|
add esi, 9*6+2*11
|
|
|
|
|
mov ecx, dword [.ks]
|
2020-06-15 00:21:29 -04:00
|
|
|
cmp word [esi], './'
|
|
|
|
|
jne .notcurdir
|
|
|
|
|
add esi, 2
|
|
|
|
|
sub ecx, 2
|
|
|
|
|
.notcurdir: repz cmpsb
|
2018-06-05 14:34:03 -04:00
|
|
|
pop edi
|
|
|
|
|
pop esi
|
|
|
|
|
jz @f
|
|
|
|
|
add esi, 76 ; no skip this record
|
|
|
|
|
add esi, dword [.ns] ; and check the next one
|
|
|
|
|
add esi, dword [.fs]
|
|
|
|
|
jmp .next
|
|
|
|
|
@@: add esi, 76 ; found! esi=data
|
|
|
|
|
add esi, dword [.ns]
|
|
|
|
|
mov ecx, dword [.fs] ; ecx=size
|
|
|
|
|
ret
|
|
|
|
|
.newc: mov edx, esi ; filename len
|
|
|
|
|
add esi, 8*11+6
|
|
|
|
|
mov ecx, 8
|
|
|
|
|
call prot_hex2bin
|
|
|
|
|
mov dword [.ns], eax
|
|
|
|
|
mov esi, edx ; filesize
|
|
|
|
|
add esi, 8*6+6
|
|
|
|
|
mov ecx, 8
|
|
|
|
|
call prot_hex2bin
|
|
|
|
|
mov dword [.fs], eax
|
|
|
|
|
mov esi, edx
|
|
|
|
|
push esi ; name equals?
|
|
|
|
|
push edi
|
|
|
|
|
add esi, 110
|
|
|
|
|
mov ecx, dword [.ks]
|
2020-06-15 00:21:29 -04:00
|
|
|
cmp word [esi], './'
|
|
|
|
|
jne .notcudir
|
|
|
|
|
add esi, 2
|
|
|
|
|
sub ecx, 2
|
|
|
|
|
.notcudir: repz cmpsb
|
2018-06-05 14:34:03 -04:00
|
|
|
pop edi
|
|
|
|
|
pop esi
|
|
|
|
|
jz @f
|
|
|
|
|
mov eax, 113 ; no skip this record
|
|
|
|
|
add eax, dword [.ns] ; and check the next one
|
|
|
|
|
and al, 0FCh
|
|
|
|
|
add esi, eax
|
|
|
|
|
mov eax, dword [.fs]
|
|
|
|
|
add eax, 3
|
|
|
|
|
and al, 0FCh
|
|
|
|
|
add esi, eax
|
|
|
|
|
cmp dword [esi], '0707' ; cpio magic
|
|
|
|
|
jne .err
|
|
|
|
|
jmp .newc
|
|
|
|
|
@@: mov eax, 113 ; found! esi=data
|
|
|
|
|
add eax, dword [.ns]
|
|
|
|
|
and al, 0FCh
|
|
|
|
|
add esi, eax
|
|
|
|
|
mov ecx, dword [.fs] ; ecx=size
|
|
|
|
|
ret
|
|
|
|
|
.ks: dd 0
|
|
|
|
|
.ns: dd 0
|
|
|
|
|
.fs: dd 0
|
|
|
|
|
|
|
|
|
|
; ----------- tar ----------
|
|
|
|
|
; Find the kernel on initrd
|
|
|
|
|
; IN: esi: initrd pointer, ecx: initrd end, edi: kernel filename
|
|
|
|
|
; OUT: On Success
|
|
|
|
|
; esi: pointer to the first byte, ecx: size in bytes
|
|
|
|
|
; On Error
|
|
|
|
|
; ecx: 0
|
|
|
|
|
tar_initrd:
|
|
|
|
|
; upper bound
|
|
|
|
|
mov ebx, ecx
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
; strlen(kernel)
|
|
|
|
|
mov eax, edi
|
|
|
|
|
or eax, eax
|
|
|
|
|
jz .err
|
|
|
|
|
cmp byte [eax], 0
|
|
|
|
|
jz .err
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
@@: inc ecx
|
|
|
|
|
inc eax
|
|
|
|
|
cmp byte [eax], 0
|
|
|
|
|
jnz @b
|
|
|
|
|
mov dword [.ks], ecx
|
|
|
|
|
; while(ptr.magic=='ustar' && ptr<limit)
|
|
|
|
|
.next: cmp esi, ebx
|
|
|
|
|
jae .err
|
|
|
|
|
cmp dword [esi+257], 'usta' ; tar magic
|
|
|
|
|
jne .err
|
|
|
|
|
cmp byte [esi+261], 'r' ; tar magic
|
|
|
|
|
je @f
|
|
|
|
|
.err: xor ecx, ecx
|
|
|
|
|
ret
|
|
|
|
|
@@: mov eax, esi ; filesize
|
|
|
|
|
add eax, 07ch
|
|
|
|
|
mov ecx, 11
|
|
|
|
|
call prot_oct2bin
|
|
|
|
|
mov dword [.fs], eax
|
|
|
|
|
push esi ; name equals?
|
|
|
|
|
push edi
|
|
|
|
|
mov ecx, dword [.ks]
|
2020-06-15 00:21:29 -04:00
|
|
|
cmp word [esi], './'
|
|
|
|
|
jne .notcurdir
|
|
|
|
|
add esi, 2
|
|
|
|
|
sub ecx, 2
|
|
|
|
|
.notcurdir: repz cmpsb
|
2018-06-05 14:34:03 -04:00
|
|
|
pop edi
|
|
|
|
|
pop esi
|
|
|
|
|
jz @f
|
|
|
|
|
add esi, 512 ; no skip this record
|
|
|
|
|
mov eax, dword [.fs] ; and check the next one
|
|
|
|
|
add eax, 511
|
|
|
|
|
shr eax, 9
|
|
|
|
|
shl eax, 9
|
|
|
|
|
add esi, eax
|
|
|
|
|
jmp .next
|
|
|
|
|
@@: add esi, 512 ; found! esi=data
|
|
|
|
|
mov ecx, dword [.fs] ; ecx=size
|
|
|
|
|
ret
|
|
|
|
|
.ks: dd 0
|
|
|
|
|
.fs: dd 0
|
|
|
|
|
|
|
|
|
|
; ----------- SFS ----------
|
|
|
|
|
; Find the kernel on Stupid File System
|
|
|
|
|
; IN: esi: initrd pointer, ecx: initrd end, edi: kernel filename
|
|
|
|
|
; OUT: On Success
|
|
|
|
|
; esi: pointer to the first byte, ecx: size in bytes
|
|
|
|
|
; On Error
|
|
|
|
|
; ecx: 0
|
|
|
|
|
sfs_initrd:
|
|
|
|
|
; check magic
|
|
|
|
|
; 1.0, Brendan's version
|
|
|
|
|
mov byte [.ver], 0
|
|
|
|
|
cmp word [esi+01ACh], 'SF'
|
|
|
|
|
jne @f
|
|
|
|
|
cmp byte [esi+01AEh], 'S'
|
|
|
|
|
je .ok
|
|
|
|
|
; 1.1, BenLunt's version
|
|
|
|
|
@@: cmp word [esi+01A6h], 'SF'
|
|
|
|
|
jne .err
|
|
|
|
|
cmp byte [esi+01A8h], 'S'
|
|
|
|
|
jne .err
|
|
|
|
|
inc byte [.ver]
|
|
|
|
|
|
|
|
|
|
; upper bound
|
|
|
|
|
.ok: mov ebx, ecx
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
; strlen(kernel)
|
|
|
|
|
mov eax, edi
|
|
|
|
|
or eax, eax
|
|
|
|
|
jz .err
|
|
|
|
|
cmp byte [eax], 0
|
|
|
|
|
jz .err
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
@@: inc ecx
|
|
|
|
|
inc eax
|
|
|
|
|
cmp byte [eax], 0
|
|
|
|
|
jnz @b
|
|
|
|
|
mov dword [.ks], ecx
|
|
|
|
|
; get block size
|
|
|
|
|
xor eax, eax
|
|
|
|
|
inc eax
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
mov cl, byte [esi+01BCh]
|
|
|
|
|
cmp byte [.ver], 0
|
|
|
|
|
jz @f
|
|
|
|
|
mov cl, byte [esi+01B6h]
|
|
|
|
|
@@: add cl, 7
|
|
|
|
|
shl eax, cl
|
|
|
|
|
mov dword [.bs], ecx
|
|
|
|
|
; get index area, base + totalblocks*blocksize - indexsize
|
|
|
|
|
xor edx, edx
|
|
|
|
|
mov eax, dword [esi+01B0h] ; total number of blocks
|
|
|
|
|
cmp byte [.ver], 0
|
|
|
|
|
jz @f
|
|
|
|
|
mov eax, dword [esi+01AAh] ; total number of blocks
|
|
|
|
|
@@: mul ecx
|
|
|
|
|
add eax, esi
|
|
|
|
|
mov ebx, eax
|
|
|
|
|
mov edx, dword [esi+01A4h] ; size of index area
|
|
|
|
|
cmp byte [.ver], 0
|
|
|
|
|
jz @f
|
|
|
|
|
mov edx, dword [esi+019Eh] ; size of index area
|
|
|
|
|
@@: sub eax, edx
|
|
|
|
|
mov edx, esi
|
|
|
|
|
mov esi, eax
|
|
|
|
|
cmp byte [esi], 02h ; got Starting Marker Entry?
|
|
|
|
|
jne .err
|
|
|
|
|
; iterate on index until we reach end or Volume Identifier
|
|
|
|
|
.nextindex: cmp esi, ebx
|
|
|
|
|
jae .err
|
|
|
|
|
cmp byte [esi], 01h
|
|
|
|
|
je .err
|
|
|
|
|
add esi, 64
|
|
|
|
|
cmp byte [esi], 12h ; file entry?
|
|
|
|
|
jne .nextindex
|
|
|
|
|
push esi ; name equals?
|
|
|
|
|
push edi
|
|
|
|
|
mov ecx, dword [.ks]
|
|
|
|
|
add esi, 022h
|
|
|
|
|
add esi, dword [.ver]
|
|
|
|
|
repz cmpsb
|
|
|
|
|
pop edi
|
|
|
|
|
pop esi
|
|
|
|
|
jnz .nextindex
|
|
|
|
|
mov ebx, esi
|
|
|
|
|
mov eax, dword [esi+0Ah] ; start_block
|
|
|
|
|
cmp byte [.ver], 0
|
|
|
|
|
jz @f
|
|
|
|
|
mov eax, dword [esi+0Bh] ; start_block
|
|
|
|
|
@@: mov esi, edx
|
|
|
|
|
xor edx, edx
|
|
|
|
|
mov ecx, dword [.bs]
|
|
|
|
|
mul ecx ; * blocksize
|
|
|
|
|
add esi, eax ; base +
|
|
|
|
|
; found! esi=data, ecx=size
|
|
|
|
|
mov ecx, dword [ebx+01Ah] ; file_length
|
|
|
|
|
cmp byte [.ver], 0
|
|
|
|
|
jz @f
|
|
|
|
|
mov ecx, dword [ebx+01Bh] ; file_length
|
|
|
|
|
@@: ret
|
|
|
|
|
.err: xor ecx, ecx
|
|
|
|
|
ret
|
|
|
|
|
.ks: dd 0
|
|
|
|
|
.bs: dd 0
|
|
|
|
|
.ver: dd 0
|
|
|
|
|
|
|
|
|
|
; ----------- JamesMolloy's ----------
|
|
|
|
|
; Find the kernel on initrd
|
|
|
|
|
; IN: esi: initrd pointer, ecx: initrd end, edi: kernel filename
|
|
|
|
|
; OUT: On Success
|
|
|
|
|
; esi: pointer to the first byte, ecx: size in bytes
|
|
|
|
|
; On Error
|
|
|
|
|
; ecx: 0
|
|
|
|
|
jamesm_initrd:
|
2020-06-19 23:00:46 -04:00
|
|
|
; no real magic, so we assume initrd contains at least one file...
|
2018-06-05 14:34:03 -04:00
|
|
|
cmp word [esi+2], 0
|
|
|
|
|
jne .err
|
|
|
|
|
cmp byte [esi+4], 0BFh
|
|
|
|
|
jne .err
|
|
|
|
|
; upper bound
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
; strlen(kernel)
|
|
|
|
|
mov eax, edi
|
|
|
|
|
or eax, eax
|
|
|
|
|
jz .err
|
|
|
|
|
cmp byte [eax], 0
|
|
|
|
|
jz .err
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
@@: inc ecx
|
|
|
|
|
inc eax
|
|
|
|
|
cmp byte [eax], 0
|
|
|
|
|
jnz @b
|
|
|
|
|
mov dword [.ks], ecx
|
|
|
|
|
mov ebx, esi
|
|
|
|
|
; edx=*(int*)initrd_p
|
|
|
|
|
lodsd
|
|
|
|
|
mov edx, eax
|
|
|
|
|
; for(i=0;i<nf && ptr[0]==0xBF;i++)
|
|
|
|
|
@@: lodsb
|
|
|
|
|
cmp al, 0BFh
|
|
|
|
|
jne .err
|
|
|
|
|
push esi ; name equals?
|
|
|
|
|
push edi
|
|
|
|
|
mov ecx, dword [.ks]
|
|
|
|
|
repz cmpsb
|
|
|
|
|
pop edi
|
|
|
|
|
pop esi
|
|
|
|
|
jz @f
|
|
|
|
|
add esi, 72
|
|
|
|
|
dec dx
|
|
|
|
|
jnz @b
|
|
|
|
|
.err: xor ecx, ecx
|
|
|
|
|
ret
|
|
|
|
|
@@: mov ecx, dword [esi+68]
|
|
|
|
|
mov esi, dword [esi+64]
|
|
|
|
|
add esi, ebx
|
|
|
|
|
ret
|
|
|
|
|
.ks: dd 0
|
