Add syscall

arch/x86_64/syscall_arch.h

@@ -23,6 +23,7 @@ static __inline long __syscall2(long n, long a1, long a2)
 	return ret;
 }
 
+
 static __inline long __syscall3(long n, long a1, long a2, long a3)
 {
 	unsigned long ret;
@@ -31,6 +32,7 @@ static __inline long __syscall3(long n, long a1, long a2, long a3)
 	return ret;
 }
 
+/*
 static __inline long __syscall4(long n, long a1, long a2, long a3, long a4)
 {
 	unsigned long ret;
@@ -60,6 +62,14 @@ static __inline long __syscall6(long n, long a1, long a2, long a3, long a4, long
 						  "d"(a3), "r"(r10), "r"(r8), "r"(r9) : "rcx", "r11", "memory");
 	return ret;
 }
+*/
+
+long int __syscall4(long int n,long int a1,long int a2,long int a3,
+		    long int a4);
+long int __syscall5(long int n,long int a1,long int a2,long int a3,
+		    long int a4,long int a5);
+long int __syscall6(long int n,long int a1,long int a2,long int a3,
+		    long int a4,long int a5,long int a6);
 
 #define VDSO_USEFUL
 #define VDSO_CGT_SYM "__vdso_clock_gettime"

src/unistd/x86_64/syscall.S

@@ -0,0 +1,50 @@
+/*
+	musl-tcc
+	File:/src/unistd/x86_64/syscall.S
+	Copyright(c) 2022 ziyao.
+*/
+
+	.global		__syscall4,__syscall5,__syscall6
+
+/*
+	long int __syscall4(long int n, long int a1,long int a2,
+			    long int a2,long int a3,long int a4);
+	n	%rdi
+	a1	%rsi
+	a2	%rdx
+	a3	%rcx
+	a4	%r8
+*/
+
+	.type	__syscall4,@function
+__syscall4:
+	movq	%rdi,	%rax
+	movq	%rsi,	%rdi
+	movq	%rdx,	%rsi
+	movq	%rcx,	%rdx
+	movq	%r8,	%r10
+	syscall
+	retq
+
+	.type	__syscall5,@function
+__syscall5:
+	movq	%rdi,	%rax
+	movq	%rsi,	%rdi
+	movq	%rdx,	%rsi
+	movq	%rcx,	%rdx
+	movq	%r8,	%r10
+	movq	%r9,	%r8
+	syscall
+	retq
+
+	.type	__syscall6,@function
+__syscall6:
+	movq	%rdi,	%rax
+	movq	%rsi,	%rdi
+	movq	%rdx,	%rsi
+	movq	%rcx,	%rdx
+	movq	%r8,	%r10
+	movq	%r9,	%r8
+	popq	%r9		// The last argument is stored on the stack
+	syscall
+	retq