; syscall_stubs.asm - user-mode INT 0x2E stubs exported by syscall.dll (MASM64)
; Microsoft x64 ABI: args in RCX, RDX, R8, R9; args 5+6 in R10, R11.

INCLUDE syscall_nr.inc   ; SYS_* constants

.CODE

SysExitThread PROC
    mov rax, SYS_EXIT_THREAD
    int 40h
    ret
SysExitThread ENDP

SysExitProcess PROC
    mov rax, SYS_EXIT_PROCESS
    int 40h
    ret
SysExitProcess ENDP

SysYield PROC
    mov rax, SYS_YIELD
    int 40h
    ret
SysYield ENDP

SysSleep PROC               ; RCX = milliseconds
    mov rax, SYS_SLEEP
    int 40h
    ret
SysSleep ENDP

SysAlloc PROC               ; RCX = size  -> RAX = ptr
    mov rax, SYS_ALLOC
    int 40h
    ret
SysAlloc ENDP

SysFree PROC                ; RCX = ptr, RDX = size
    mov rax, SYS_FREE
    int 40h
    ret
SysFree ENDP

SysCreateThread PROC        ; RCX=entry, RDX=arg, R8=priority -> RAX=handle
    mov rax, SYS_CREATE_THREAD
    int 40h
    ret
SysCreateThread ENDP

SysCloseHandle PROC         ; RCX = handle
    mov rax, SYS_CLOSE_HANDLE
    int 40h
    ret
SysCloseHandle ENDP

SysDbgPrint PROC            ; RCX = string ptr
    mov rax, SYS_DBG_PRINT
    int 40h
    ret
SysDbgPrint ENDP

SysMutexCreate PROC         ; -> RAX = handle
    mov rax, SYS_MUTEX_CREATE
    int 40h
    ret
SysMutexCreate ENDP

SysMutexAcquire PROC        ; RCX = handle
    mov rax, SYS_MUTEX_ACQUIRE
    int 40h
    ret
SysMutexAcquire ENDP

SysMutexRelease PROC        ; RCX = handle
    mov rax, SYS_MUTEX_RELEASE
    int 40h
    ret
SysMutexRelease ENDP

SysSemCreate PROC           ; RCX=initial, RDX=max -> RAX=handle
    mov rax, SYS_SEM_CREATE
    int 40h
    ret
SysSemCreate ENDP

SysSemWait PROC             ; RCX = handle
    mov rax, SYS_SEM_WAIT
    int 40h
    ret
SysSemWait ENDP

SysSemSignal PROC           ; RCX = handle
    mov rax, SYS_SEM_SIGNAL
    int 40h
    ret
SysSemSignal ENDP

SysEventCreate PROC         ; RCX=manualReset, RDX=initialState -> RAX=handle
    mov rax, SYS_EVENT_CREATE
    int 40h
    ret
SysEventCreate ENDP

SysEventSet PROC            ; RCX = handle
    mov rax, SYS_EVENT_SET
    int 40h
    ret
SysEventSet ENDP

SysEventWait PROC           ; RCX = handle
    mov rax, SYS_EVENT_WAIT
    int 40h
    ret
SysEventWait ENDP

SysQueueCreate PROC         ; -> RAX = handle
    mov rax, SYS_QUEUE_CREATE
    int 40h
    ret
SysQueueCreate ENDP

SysQueueSend PROC           ; RCX=handle, RDX=*msg, R8=blocking
    mov rax, SYS_QUEUE_SEND
    int 40h
    ret
SysQueueSend ENDP

SysQueueRecv PROC           ; RCX=handle, RDX=*msg, R8=blocking
    mov rax, SYS_QUEUE_RECV
    int 40h
    ret
SysQueueRecv ENDP

SysScreenBlit PROC
    ; RCX=x, RDX=y, R8=w, R9=h
    ; The 5th arg (pixels) is on the stack above the 32-byte shadow space and return address.
    mov r10, [rsp + 40]         
    
    mov rax, SYS_SCREEN_BLIT
    int 40h
    ret
SysScreenBlit ENDP

SysGetTick PROC             ; -> RAX = milliseconds
    mov rax, SYS_GET_TICK
    int 40h
    ret
SysGetTick ENDP

SysOpen PROC                ; RCX = *path  -> RAX = handle (0 = failure)
    mov rax, SYS_OPEN
    int 40h
    ret
SysOpen ENDP

SysRead PROC                ; RCX = handle, RDX = *buf, R8 = size -> RAX = bytes read
    mov rax, SYS_READ
    int 40h
    ret
SysRead ENDP

SysFClose PROC              ; RCX = handle
    mov rax, SYS_FCLOSE
    int 40h
    ret
SysFClose ENDP

SysFSeek PROC               ; RCX = handle, RDX = offset
    mov rax, SYS_FSEEK
    int 40h
    ret
SysFSeek ENDP

SysFSize PROC               ; RCX = handle -> RAX = size in bytes
    mov rax, SYS_FSIZE
    int 40h
    ret
SysFSize ENDP

END