90 lines
2.9 KiB
PHP
90 lines
2.9 KiB
PHP
; Threads management.
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; int create_thread(int (*proc)(void *param), void *param, int stack_size)
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; Creates a thread that executes the given function proc(param).
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; Returns -1 on error, TID otherwise.
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; If proc(param) returns, the returned value is passed to exit_thread().
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; If stack_size is zero, uses the value from PE header of the executable.
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proc create_thread stdcall uses ebx, thread_proc, param, stack_size
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; 1. Determine stack size.
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; Align stack_size up to page boundary;
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mov ecx, [stack_size]
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add ecx, 0xFFF
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and ecx, not 0xFFF
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jnz .stack_size_ok
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; if this results in zero, read the value from the header of main module.
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mov eax, [modules_list + MODULE.next]
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mov eax, [eax + MODULE.base]
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mov ecx, [eax+STRIPPED_PE_HEADER.SizeOfStackReserve]
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cmp byte [eax], 'M'
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jnz .stack_size_ok
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mov ecx, [eax+3Ch]
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mov ecx, [eax+ecx+IMAGE_NT_HEADERS.OptionalHeader.SizeOfStackReserve]
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.stack_size_ok:
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mov [stack_size], ecx
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; 2. Allocate the stack.
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mov eax, 68
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mov ebx, 12
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call FS_SYSCALL_PTR
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test eax, eax
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jz .fail
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; 3. Copy parameters to the stack.
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lea edx, [eax+ecx-16]
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mov [edx], ecx
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mov ebx, FS_SYSCALL_PTR
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mov [edx+4], ebx
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mov ebx, [thread_proc]
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mov [edx+8], ebx
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mov ebx, [param]
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mov [edx+12], ebx
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; 4. Call the kernel to create the thread.
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mov eax, 51
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mov ebx, 1
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mov ecx, internal_thread_start
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call FS_SYSCALL_PTR
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cmp eax, -1
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jz .fail_free
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ret
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.fail_free:
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mov eax, 68
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mov ebx, 13
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lea ecx, [edx+12]
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sub ecx, [stack_size]
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call FS_SYSCALL_PTR
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xor eax, eax
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.fail:
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dec eax
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ret
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endp
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; void exit_thread(int exit_code)
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; Terminates the current thread.
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; exit_code is reserved; currently ignored
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proc exit_thread stdcall, exit_code
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; Use int 0x40 instead of call FS_SYSCALL_PTR, because we are freeing the stack.
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mov eax, 68
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mov ebx, 13
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mov ecx, FS_STACK_MIN
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int 0x40
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or eax, -1
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int 0x40
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endp
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; Real entry point of threads created by create_thread.
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; Provides user-space initialization of the thread,
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; calls user-provided thread routine,
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; passes the returned value to exit_thread.
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proc internal_thread_start
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pop eax ; stack_size
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lea ecx, [esp+12]
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mov FS_STACK_MAX, ecx
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sub ecx, eax
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mov FS_STACK_MIN, ecx
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pop FS_SYSCALL_PTR ; from caller's FS_SYSCALL_PTR
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pop eax ; thread_proc
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call eax ; param is still on the stack
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push eax ; exit_code
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push 0 ; no return address
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jmp exit_thread
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endp
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