264 lines
7.4 KiB
NASM
264 lines
7.4 KiB
NASM
format PE DLL GUI 0.8 at 7FF00000h
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entry start
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include '../../struct.inc'
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include '../../proc32.inc'
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include 'fpo.inc'
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include 'export.inc'
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include 'pe.inc'
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section '.text' code readable executable
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FS_STACK_MAX equ dword [fs:4]
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FS_STACK_MIN equ dword [fs:8]
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FS_SELF_PTR equ dword [fs:0x18]
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FS_PROCESS_DATA equ dword [fs:0x30]
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FS_ERRNO equ dword [fs:0x34]
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FS_SYSCALL_PTR equ dword [fs:0xC0]
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ENOMEM = 12
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DLL_PROCESS_DETACH = 0
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DLL_PROCESS_ATTACH = 1
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DLL_THREAD_ATTACH = 2
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DLL_THREAD_DETACH = 3
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SYSCALL_METHOD_I40 = 1
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SYSCALL_METHOD_SYSENTER = 2
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SYSCALL_METHOD_SYSCALL = 3
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; Pointer to this structure is passed as the third argument
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; to 'start' procedure by the kernel.
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struct kernel_init_data
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version dw ?
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flags dw ?
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syscall_method dd ?
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; either one of SYSCALL_METHOD_xxx or pointer to procedure
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exe_base dd ?
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stack_base dd ?
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stack_size dd ?
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exe_path dd ?
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command_line dd ?
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environment dd ?
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ends
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include 'malloc.inc'
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include 'peloader.inc'
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include 'cmdline.inc'
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proc syscall_int40
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int 0x40
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ret
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endp
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proc syscall_sysenter
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push ebp
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mov ebp, esp
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push @f
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sysenter
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@@:
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pop edx
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pop ecx
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ret
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endp
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proc syscall_syscall
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push ecx
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syscall
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pop ecx
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ret
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endp
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proc kercall
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jmp FS_SYSCALL_PTR
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endp
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prologue@proc equ fpo_prologue
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epilogue@proc equ fpo_epilogue
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proc start stdcall, dll_base, reason, reserved
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locals
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exe_base dd ?
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exe_path_size dd ?
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endl
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; 1. Do nothing unless called by the kernel for DLL_PROCESS_ATTACH.
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cmp [reason], DLL_PROCESS_ATTACH
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jnz .nothing
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; 2. Initialize process.
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; 2a. Validate version of the init struct.
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; If not known, say a debug message and die.
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mov ebp, [reserved]
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mov esi, [dll_base]
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cmp [ebp+kernel_init_data.version], 1
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jnz .version_mismatch
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; 2b. Get the system call code.
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; Note: relocations have not been fixed yet,
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; so we cannot use absolute addresses, only RVAs.
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mov eax, [ebp+kernel_init_data.syscall_method]
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cmp eax, 0x10000
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jae .syscall_absolute
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dec eax
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mov edx, rva syscall_int40
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cmp eax, num_syscall_methods
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jae @f
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mov edx, [esi+eax*4+rva syscall_methods]
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@@:
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lea eax, [edx+esi]
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.syscall_absolute:
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mov FS_SYSCALL_PTR, eax
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; 2c. Fixup relocations so that we can use absolute offsets instead of RVAs
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; in rest of code.
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; Note: this uses syscalls, so this step should be done after
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; configuring FS_SYSCALL_PTR at step 2b.
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push kolibri_dll
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call fixup_pe_relocations
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pop ecx
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jc .die
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; 2d. Allocate process data.
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mov eax, 68
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mov ebx, 12
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mov ecx, 0x1000
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call FS_SYSCALL_PTR
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mov FS_PROCESS_DATA, eax
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; 2e. Initialize process heap.
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mov eax, [ebp+kernel_init_data.exe_base]
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mov [exe_base], eax
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mov edx, [eax+STRIPPED_PE_HEADER.SizeOfHeapReserve]
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cmp word [eax], 'MZ'
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jnz @f
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add eax, [eax+IMAGE_DOS_HEADER.e_lfanew]
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mov edx, [eax+IMAGE_NT_HEADERS.OptionalHeader.SizeOfHeapReserve]
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@@:
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malloc_init
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; 2f. Copy rest of init struct and free memory.
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; Parse command line to argc/argv here and move arguments to the heap
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; in order to save memory: init struct and heap use different pages,
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; but typically data from init struct are far from the entire page,
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; so moving it to heap does not increase actual physical heap size
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; and allows to free init struct.
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mov eax, [ebp+kernel_init_data.stack_base]
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mov FS_STACK_MIN, eax
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add eax, [ebp+kernel_init_data.stack_size]
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mov FS_STACK_MAX, eax
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mov eax, [ebp+kernel_init_data.exe_path]
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@@:
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inc eax
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cmp byte [eax-1], 0
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jnz @b
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sub eax, [ebp+kernel_init_data.exe_path]
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mov [exe_path_size], eax
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mov esi, [ebp+kernel_init_data.command_line]
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xor edx, edx
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xor edi, edi
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call parse_cmdline
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inc ebx ; argv[0] = exe path
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.argc equ dll_base
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.argv equ reason
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.envp equ reserved
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mov [.argc], ebx
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sub esi, [ebp+kernel_init_data.command_line]
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lea esi, [esi+(ebx+1)*4]
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add esi, [exe_path_size]
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stdcall malloc, esi
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mov [.argv], eax
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mov edx, eax
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lea edi, [eax+ebx*4]
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mov esi, [ebp+kernel_init_data.exe_path]
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mov [edx], edi
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add edx, 4
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mov ecx, [exe_path_size]
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rep movsb
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mov esi, [ebp+kernel_init_data.command_line]
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call parse_cmdline
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and dword [edx], 0 ; argv[argc] = NULL
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and [.envp], 0
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mov eax, 68
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mov ebx, 13
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mov ecx, ebp
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call FS_SYSCALL_PTR
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; 3. Configure modules: main EXE and possible statically linked DLLs.
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mov esi, [exe_base]
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mov eax, [.argv]
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pushd [eax]
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call fixup_pe_relocations
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pop ecx
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jc .die
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; 4. Call exe entry point.
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mov edx, [esi+STRIPPED_PE_HEADER.AddressOfEntryPoint]
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cmp word [esi], 'MZ'
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jnz @f
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mov ecx, [esi+IMAGE_DOS_HEADER.e_lfanew]
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add ecx, esi
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mov edx, [ecx+IMAGE_NT_HEADERS.OptionalHeader.AddressOfEntryPoint]
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@@:
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add edx, esi
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add esp, fpo_localsize+4
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call edx
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; If exe entry point has returned control, die.
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jmp .die
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.version_mismatch:
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lea eax, [esi + rva syscall_int40]
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mov FS_SYSCALL_PTR, eax
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add esi, rva msg_version_mismatch
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call sys_msg_board_str
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.die:
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or eax, -1
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call FS_SYSCALL_PTR
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.nothing:
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ret
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endp
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proc sys_msg_board_str
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push eax ebx
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@@:
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push ecx
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mov cl, [ecx]
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test cl, cl
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jz @f
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mov eax, 63
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mov ebx, 1
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call FS_SYSCALL_PTR
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pop ecx
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inc ecx
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jmp @b
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@@:
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pop ecx ebx eax
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ret
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endp
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align 4
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syscall_methods dd rva syscall_int40, rva syscall_sysenter, rva syscall_syscall
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num_syscall_methods = ($ - syscall_methods) / 4
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align 4
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data export
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export 'kolibri.dll' \
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, kercall, 'kercall' \
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, malloc, 'malloc' \
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, free, 'free' \
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, calloc, 'calloc' \
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, realloc, 'realloc' \
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, realloc_in_place, 'realloc_in_place' \
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, memalign, 'memalign' \
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, create_mspace, 'create_mspace' \
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, destroy_mspace, 'destroy_mspace' \
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, mspace_malloc, 'mspace_malloc' \
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, mspace_free, 'mspace_free' \
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, mspace_calloc, 'mspace_calloc' \
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, mspace_realloc, 'mspace_realloc' \
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, mspace_realloc_in_place, 'mspace_realloc_in_place' \
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, mspace_memalign, 'mspace_memalign' \
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end data
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kolibri_dll db 'kolibri.dll',0
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msg_version_mismatch db 'S : Version mismatch between kernel and kolibri.dll',13,10,0
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msg_bad_relocation1 db 'S : Bad relocation type in ',0
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msg_newline db 13,10,0
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msg_relocated1 db 'S : fixups for ',0
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msg_relocated2 db ' applied',13,10,0
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if FOOTERS
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section '.data' data readable writable
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malloc_magic dd ?
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end if
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