unify non-inline version of syscall code across archs

except powerpc, which still lacks inline syscalls simply because
nobody has written the code, these are all fallbacks used to work
around a clang bug that probably does not exist in versions of clang
that can compile musl. however, it's useful to have the generic
non-inline code anyway, as it eases the task of porting to new archs:
writing inline syscall code is now optional. this approach could also
help support compilers which don't understand inline asm or lack
support for the needed register constraints.

mips could not be unified because it has special fixup code for broken
layout of the kernel's struct stat.

arch/microblaze/syscall_arch.h

@@ -100,39 +100,7 @@ static inline long __syscall6(long n, long a, long b, long c, long d, long e, lo
 
 #else
 
-static inline long __syscall0(long n)
-{
-	return (__syscall)(n);
-}
-
-static inline long __syscall1(long n, long a)
-{
-	return (__syscall)(n, a);
-}
-
-static inline long __syscall2(long n, long a, long b)
-{
-	return (__syscall)(n, a, b);
-}
-
-static inline long __syscall3(long n, long a, long b, long c)
-{
-	return (__syscall)(n, a, b, c);
-}
-
-static inline long __syscall4(long n, long a, long b, long c, long d)
-{
-	return (__syscall)(n, a, b, c, d);
-}
-
-static inline long __syscall5(long n, long a, long b, long c, long d, long e)
-{
-	return (__syscall)(n, a, b, c, d, e);
-}
-
-static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
-{
-	return (__syscall)(n, a, b, c, d, e, f);
-}
+#undef SYSCALL_NO_INLINE
+#define SYSCALL_NO_INLINE
 
 #endif

arch/or1k/syscall_arch.h

@@ -118,39 +118,7 @@ static inline long __syscall6(long n, long a, long b, long c, long d, long e, lo
 
 #else
 
-static inline long __syscall0(long n)
-{
-	return (__syscall)(n);
-}
-
-static inline long __syscall1(long n, long a)
-{
-	return (__syscall)(n, a);
-}
-
-static inline long __syscall2(long n, long a, long b)
-{
-	return (__syscall)(n, a, b);
-}
-
-static inline long __syscall3(long n, long a, long b, long c)
-{
-	return (__syscall)(n, a, b, c);
-}
-
-static inline long __syscall4(long n, long a, long b, long c, long d)
-{
-	return (__syscall)(n, a, b, c, d);
-}
-
-static inline long __syscall5(long n, long a, long b, long c, long d, long e)
-{
-	return (__syscall)(n, a, b, c, d, e);
-}
-
-static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
-{
-	return (__syscall)(n, a, b, c, d, e, f);
-}
+#undef SYSCALL_NO_INLINE
+#define SYSCALL_NO_INLINE
 
 #endif

arch/powerpc/syscall_arch.h

@@ -3,39 +3,5 @@
 ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
 #define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
 
-long (__syscall)(long, ...);
-
-static inline long __syscall0(long n)
-{
-	return (__syscall)(n, 0, 0, 0, 0, 0, 0);
-}
-
-static inline long __syscall1(long n, long a)
-{
-	return (__syscall)(n, a, 0, 0, 0, 0, 0);
-}
-
-static inline long __syscall2(long n, long a, long b)
-{
-	return (__syscall)(n, a, b, 0, 0, 0, 0);
-}
-
-static inline long __syscall3(long n, long a, long b, long c)
-{
-	return (__syscall)(n, a, b, c, 0, 0, 0);
-}
-
-static inline long __syscall4(long n, long a, long b, long c, long d)
-{
-	return (__syscall)(n, a, b, c, d, 0, 0);
-}
-
-static inline long __syscall5(long n, long a, long b, long c, long d, long e)
-{
-	return (__syscall)(n, a, b, c, d, e, 0);
-}
-
-static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
-{
-	return (__syscall)(n, a, b, c, d, e, f);
-}
+#undef SYSCALL_NO_INLINE
+#define SYSCALL_NO_INLINE

src/internal/syscall.h

@@ -24,12 +24,22 @@ long __syscall_ret(unsigned long), __syscall(syscall_arg_t, ...),
 	__syscall_cp(syscall_arg_t, syscall_arg_t, syscall_arg_t, syscall_arg_t,
 	             syscall_arg_t, syscall_arg_t, syscall_arg_t);
 
+#ifdef SYSCALL_NO_INLINE
+#define __syscall0(n) (__syscall)(n)
+#define __syscall1(n,a) (__syscall)(n,__scc(a))
+#define __syscall2(n,a,b) (__syscall)(n,__scc(a),__scc(b))
+#define __syscall3(n,a,b,c) (__syscall)(n,__scc(a),__scc(b),__scc(c))
+#define __syscall4(n,a,b,c,d) (__syscall)(n,__scc(a),__scc(b),__scc(c),__scc(d))
+#define __syscall5(n,a,b,c,d,e) (__syscall)(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e))
+#define __syscall6(n,a,b,c,d,e,f) (__syscall)(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),__scc(f))
+#else
 #define __syscall1(n,a) __syscall1(n,__scc(a))
 #define __syscall2(n,a,b) __syscall2(n,__scc(a),__scc(b))
 #define __syscall3(n,a,b,c) __syscall3(n,__scc(a),__scc(b),__scc(c))
 #define __syscall4(n,a,b,c,d) __syscall4(n,__scc(a),__scc(b),__scc(c),__scc(d))
 #define __syscall5(n,a,b,c,d,e) __syscall5(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e))
 #define __syscall6(n,a,b,c,d,e,f) __syscall6(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),__scc(f))
+#endif
 #define __syscall7(n,a,b,c,d,e,f,g) (__syscall)(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),__scc(f),__scc(g))
 
 #define __SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n