Fix bugs, add propper tests

src/targets/x86_64/asmgen/linux/runtime.s

@@ -1,36 +1,61 @@
-; generated with godbolt: https://godbolt.org/#z:OYLghAFBqd5QCxAYwPYBMCmBRdBLAF1QCcAaPECAMzwBtMA7AQwFtMQByARg9KtQYEAysib0QXACx8BBAKoBnTAAUAHpwAMvAFYTStJg1AB9U8lJL6yAngGVG6AMKpaAVxYMQAJlIOAMngMmABy7gBGmMQgAMw%2BAA6oCoS2DM5uHt6kCUk2AgFBoSwRUbEWmFa5DEIETMQEae6ePpaY1inVtQT5IeGRMc01dQ0ZA53dhcX9AJQWqK7EyOwcAPQAVADUACoAnnGY69tzxOtoWOsIkZik6yTrtKhM6OuG65iqrHH0AHTrq8sApBoAIL/LzRQLINxnf7RRwKAjoWh4MJfBAw7CAkFgiFQ/YwuEI2yo9GY0HghiQ1zQ2Hw/CCYnRDHAzFJABemGMBHWLG2Cl5olotAgrkCBAAHJznsRgMY0K5BNcRYIJVy%2BQoBbRjAx3NcAG6oPBPVarWrABRTdb/ADsACFMesHes2RyucRMAQYXbgY71m7gHh4ZEnXh2ZLiExVM8FCwIKCvOHVHGLTCACJO/liTXalie%2B2Ov0BghB51h/BRmNx4j4JOW6JpjS5735zD%2BwPHEuupLl2NeeNJGup9YN6JeoE%2Bgtt4Oh13oSNMaM9%2BOzgd1oeNsfN1tF9shl2%2BrgabuVg8r%2Bvr8ctwvF3dhsUO%2BcV3vEMU12tnkd5h0T7dTvfEACc94LpW/6voOw6jp%2B6x4FQ6wQKaspzIItbYEOFpVngb5wR2Uymgo/wAKw2g2BEpuejowXBCFysh6LrFw6FdoOEA4XhhE2lwhFkR%2BTYOpR8HSoh8pcnRXjobOWEsTeBC4dK%2BFEV4XHkXxsECTKNEiYy6zROhB6SaxcnsdESk8RuKlUYJGkoeskjoXe%2BnSbJZrsZIJmjj6/HUUhmmoQR6GAQ505OfJNoEW5pK8eW6z6gYNj0HBUE%2BnGaoanGiWOiAlq9qmTBxhAboyelDqZXGuW9vlEYzFlXhkeVGFVXGQh5cQSQNb26DNbOMxFY6lbNQebXxs1YqDcQzX/lMPUlU%2ByCJr21zHpx83VWwLAkNsaWRZNplQQV8wML67rrtaKYcDMtCcARvCeBwWikKgnCOE6RyLFl0Q8KQBCaGdMwANYgARGj6JwkjXd992cLwCggEDX23WdpBwLASBoCwcR0JE5CUKj6P0FEyDAFwBE%2BDQtDbtDEBhODYSBLU2ycB9NPMMQ2wAPJhNorRwx9qNsIIrMMLQ9Pw6QWBhK4wCOJm0PcLwWAsIYwDiCL%2BBum0uqYDLd1vK0rhFgzvCiuU4NImE4Ys84WDgwQxB4CwBukBrxBhIkmAppgCtGEiRjfTMVAGGaABqeCYAA7qzew3R9/CCCIYjsFIMiCIoKjqCLuhcPoisgKYsr6Mi0OQDMqBxJUMsALSs9EvCoE7ttYIXEAzC0bR2BADjDJ4XA%2BP4gQ9EUfTvVkiTJAInd6Nko8MOMvRRJnLeVB0QwuI0EjNOUXPtIMXR9xMg/z9v48H2Mu%2BzxIzcvQn52XWDIsPRw6yqGKABs5fP5I6zAMgyD0QRXxeHBXAhBbhkgYrwOGWgph/QBkDC6HBQakBunde%2BUMYafV9tfDgXhb7IMhug%2BGUDHaRCSHYSQQA
-; removed "qword ptr" and replaced with "qword"
-__INTERNAL_syscall:
-        mov     ecx, edi
-        mov     r11, rdx
-        movzx   eax, sil
-        xor     edi, edi
-        xor     esi, esi
-        xor     edx, edx
-        xor     r10d, r10d
-        xor     r8d, r8d
-        xor     r9d, r9d
-        test    cl, cl
-        je      .L3
-        mov     rdi, QWORD [r11]
-        cmp     cl, 1
-        je      .L3
-        mov     rsi, QWORD [r11+8]
-        cmp     cl, 2
-        je      .L3
-        mov     rdx, QWORD [r11+16]
-        cmp     cl, 3
-        je      .L3
-        mov     r10, QWORD [r11+24]
-        cmp     cl, 4
-        je      .L3
-        mov     r8, QWORD [r11+32]
-        cmp     cl, 5
-        je      .L3
-        mov     r9, QWORD [r11+40]
-.L3:
-        syscall
-        ret
+
+__INTERNAL_syscall0:
+    mov rax, rdi
+    syscall
+    ret
+
+__INTERNAL_syscall1:
+    mov rax, rdi
+    mov rdi, rsi
+    syscall
+    ret
+
+__INTERNAL_syscall2:
+    mov rax, rdi
+    mov rdi, rsi
+    mov rsi, rdx
+    syscall
+    ret
+
+__INTERNAL_syscall3:
+    mov rax, rdi
+    mov rdi, rsi
+    mov rsi, rdx
+    mov rdx, rcx
+    syscall
+    ret
+
+__INTERNAL_syscall4:
+    mov rax, rdi
+    mov rdi, rsi
+    mov rsi, rdx
+    mov rdx, rcx
+    mov r10, r8
+    syscall
+    ret
+
+__INTERNAL_syscall5:
+    mov rax, rdi
+    mov rdi, rsi
+    mov rsi, rdx
+    mov rdx, rcx
+    mov r10, r8
+    mov r8,  r9
+    syscall
+    ret
+
+__INTERNAL_syscall6:
+    mov rax, rdi
+    mov rdi, rsi
+    mov rsi, rdx
+    mov rdx, rcx
+    mov r10, r8
+    mov r8,  r9
+    mov r9,  [rsp + 8]
+    syscall
+    ret
+
+
 global _start
 _start:
     xor rax, rax