musl/arch/mips/syscall_arch.h

#define __SYSCALL_LL_E(x) \
((union { long long ll; long l[2]; }){ .ll = x }).l[0], \
((union { long long ll; long l[2]; }){ .ll = x }).l[1]
#define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))

#define SYSCALL_RLIM_INFINITY (-1UL/2)

#if __mips_isa_rev >= 6
#define SYSCALL_CLOBBERLIST \
	"$1", "$3", "$11", "$12", "$13", \
	"$14", "$15", "$24", "$25", "memory"
#else
#define SYSCALL_CLOBBERLIST \
	"$1", "$3", "$11", "$12", "$13", \
	"$14", "$15", "$24", "$25", "hi", "lo", "memory"
#endif

static inline long __syscall0(long n)
{
	register long r7 __asm__("$7");
	register long r2 __asm__("$2");
	__asm__ __volatile__ (
		"addu $2,$0,%2 ; syscall"
		: "=&r"(r2), "=r"(r7)
		: "ir"(n), "0"(r2)
		: SYSCALL_CLOBBERLIST, "$8", "$9", "$10");
	return r7 && r2>0 ? -r2 : r2;
}

static inline long __syscall1(long n, long a)
{
	register long r4 __asm__("$4") = a;
	register long r7 __asm__("$7");
	register long r2 __asm__("$2");
	__asm__ __volatile__ (
		"addu $2,$0,%2 ; syscall"
		: "=&r"(r2), "=r"(r7)
		: "ir"(n), "0"(r2), "r"(r4)
		: SYSCALL_CLOBBERLIST, "$8", "$9", "$10");
	return r7 && r2>0 ? -r2 : r2;
}

static inline long __syscall2(long n, long a, long b)
{
	register long r4 __asm__("$4") = a;
	register long r5 __asm__("$5") = b;
	register long r7 __asm__("$7");
	register long r2 __asm__("$2");
	__asm__ __volatile__ (
		"addu $2,$0,%2 ; syscall"
		: "=&r"(r2), "=r"(r7)
		: "ir"(n), "0"(r2), "r"(r4), "r"(r5)
		: SYSCALL_CLOBBERLIST, "$8", "$9", "$10");
	return r7 && r2>0 ? -r2 : r2;
}

static inline long __syscall3(long n, long a, long b, long c)
{
	register long r4 __asm__("$4") = a;
	register long r5 __asm__("$5") = b;
	register long r6 __asm__("$6") = c;
	register long r7 __asm__("$7");
	register long r2 __asm__("$2");
	__asm__ __volatile__ (
		"addu $2,$0,%2 ; syscall"
		: "=&r"(r2), "=r"(r7)
		: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
		: SYSCALL_CLOBBERLIST, "$8", "$9", "$10");
	return r7 && r2>0 ? -r2 : r2;
}

static inline long __syscall4(long n, long a, long b, long c, long d)
{
	register long r4 __asm__("$4") = a;
	register long r5 __asm__("$5") = b;
	register long r6 __asm__("$6") = c;
	register long r7 __asm__("$7") = d;
	register long r2 __asm__("$2");
	__asm__ __volatile__ (
		"addu $2,$0,%2 ; syscall"
		: "=&r"(r2), "+r"(r7)
		: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
		: SYSCALL_CLOBBERLIST, "$8", "$9", "$10");
	return r7 && r2>0 ? -r2 : r2;
}

static inline long __syscall5(long n, long a, long b, long c, long d, long e)
{
	register long r4 __asm__("$4") = a;
	register long r5 __asm__("$5") = b;
	register long r6 __asm__("$6") = c;
	register long r7 __asm__("$7") = d;
	register long r8 __asm__("$8") = e;
	register long r2 __asm__("$2");
	__asm__ __volatile__ (
		"subu $sp,$sp,32 ; sw $8,16($sp) ; "
		"addu $2,$0,%3 ; syscall ;"
		"addu $sp,$sp,32"
		: "=&r"(r2), "+r"(r7), "+r"(r8)
		: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
		: SYSCALL_CLOBBERLIST, "$9", "$10");
	return r7 && r2>0 ? -r2 : r2;
}

static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
{
	register long r4 __asm__("$4") = a;
	register long r5 __asm__("$5") = b;
	register long r6 __asm__("$6") = c;
	register long r7 __asm__("$7") = d;
	register long r8 __asm__("$8") = e;
	register long r9 __asm__("$9") = f;
	register long r2 __asm__("$2");
	__asm__ __volatile__ (
		"subu $sp,$sp,32 ; sw $8,16($sp) ; sw $9,20($sp) ; "
		"addu $2,$0,%4 ; syscall ;"
		"addu $sp,$sp,32"
		: "=&r"(r2), "+r"(r7), "+r"(r8), "+r"(r9)
		: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
		: SYSCALL_CLOBBERLIST, "$10");
	return r7 && r2>0 ? -r2 : r2;
}

static inline long __syscall7(long n, long a, long b, long c, long d, long e, long f, long g)
{
	register long r4 __asm__("$4") = a;
	register long r5 __asm__("$5") = b;
	register long r6 __asm__("$6") = c;
	register long r7 __asm__("$7") = d;
	register long r8 __asm__("$8") = e;
	register long r9 __asm__("$9") = f;
	register long r10 __asm__("$10") = g;
	register long r2 __asm__("$2");
	__asm__ __volatile__ (
		"subu $sp,$sp,32 ; sw $8,16($sp) ; sw $9,20($sp) ; sw $10,24($sp) ; "
		"addu $2,$0,%5 ; syscall ;"
		"addu $sp,$sp,32"
		: "=&r"(r2), "+r"(r7), "+r"(r8), "+r"(r9), "+r"(r10)
		: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
		: SYSCALL_CLOBBERLIST);
	return r7 && r2>0 ? -r2 : r2;
}

#define VDSO_USEFUL
#define VDSO_CGT32_SYM "__vdso_clock_gettime"
#define VDSO_CGT32_VER "LINUX_2.6"
#define VDSO_CGT_SYM "__vdso_clock_gettime64"
#define VDSO_CGT_VER "LINUX_2.6"

#define SO_SNDTIMEO_OLD 0x1005
#define SO_RCVTIMEO_OLD 0x1006

#undef SYS_socketcall