lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 90 insertions, 0 deletions

diff --git a/lib/mlibc/sysdeps/linux/include/bits/syscall.h b/lib/mlibc/sysdeps/linux/include/bits/syscall.h
new file mode 100644
index 0000000..3023a3b
--- /dev/null
+++ b/lib/mlibc/sysdeps/linux/include/bits/syscall.h
@@ -0,0 +1,90 @@
+#ifndef _MLIBC_SYSCALL_H
+#define _MLIBC_SYSCALL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef long __sc_word_t;
+
+/* These functions are implemented in arch-syscall.cpp. */
+__sc_word_t __do_syscall0(long);
+__sc_word_t __do_syscall1(long, __sc_word_t);
+__sc_word_t __do_syscall2(long, __sc_word_t, __sc_word_t);
+__sc_word_t __do_syscall3(long, __sc_word_t, __sc_word_t, __sc_word_t);
+__sc_word_t __do_syscall4(long, __sc_word_t, __sc_word_t, __sc_word_t, __sc_word_t);
+__sc_word_t __do_syscall5(long, __sc_word_t, __sc_word_t, __sc_word_t, __sc_word_t,
+		__sc_word_t);
+__sc_word_t __do_syscall6(long, __sc_word_t, __sc_word_t, __sc_word_t, __sc_word_t,
+		__sc_word_t, __sc_word_t);
+__sc_word_t __do_syscall7(long, __sc_word_t, __sc_word_t, __sc_word_t, __sc_word_t,
+		__sc_word_t, __sc_word_t, __sc_word_t);
+long __do_syscall_ret(unsigned long);
+
+#ifdef __cplusplus
+extern "C++" {
+
+/* Defining a syscall as a macro is more problematic in C++, since there's a high chance of
+ * a name collision e.g foo.syscall() or foo::syscall.
+ */
+template<typename Arg0>
+long syscall(long n) {
+	return __do_syscall_ret(__do_syscall0(n));
+}
+template<typename Arg0>
+long syscall(long n, Arg0 a0) {
+	return __do_syscall_ret(__do_syscall1(n, (long)a0));
+}
+template<typename Arg0, typename Arg1>
+long syscall(long n, Arg0 a0, Arg1 a1) {
+	return __do_syscall_ret(__do_syscall2(n, (long)a0, (long)a1));
+}
+template<typename Arg0, typename Arg1, typename Arg2>
+long syscall(long n, Arg0 a0, Arg1 a1, Arg2 a2) {
+	return __do_syscall_ret(__do_syscall3(n, (long)a0, (long)a1, (long)a2));
+}
+template<typename Arg0, typename Arg1, typename Arg2, typename Arg3>
+long syscall(long n, Arg0 a0, Arg1 a1, Arg2 a2, Arg3 a3) {
+	return __do_syscall_ret(__do_syscall4(n, (long)a0, (long)a1, (long)a2, (long)a3));
+}
+template<typename Arg0, typename Arg1, typename Arg2, typename Arg3, typename Arg4>
+long syscall(long n, Arg0 a0, Arg1 a1, Arg2 a2, Arg3 a3, Arg4 a4) {
+	return __do_syscall_ret(__do_syscall5(n, (long)a0, (long)a1, (long)a2, (long)a3, (long)a4));
+}
+template<typename Arg0, typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5>
+long syscall(long n, Arg0 a0, Arg1 a1, Arg2 a2, Arg3 a3, Arg4 a4, Arg5 a5) {
+	return __do_syscall_ret(__do_syscall6(n, (long)a0, (long)a1, (long)a2, (long)a3, (long)a4, (long)a5));
+}
+template<typename Arg0, typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5, typename Arg6>
+long syscall(long n, Arg0 a0, Arg1 a1, Arg2 a2, Arg3 a3, Arg4 a4, Arg5 a5, Arg6 a6) {
+	return __do_syscall_ret(__do_syscall7(n, (long)a0, (long)a1, (long)a2, (long)a3, (long)a4, (long)a5, (long)a6));
+}
+
+} /* extern C++ */
+#else
+
+/* These syscall macros were copied from musl. */
+#define __scc(x) ((__sc_word_t)(x))
+#define __syscall0(n) __do_syscall0(n)
+#define __syscall1(n,a) __do_syscall1(n,__scc(a))
+#define __syscall2(n,a,b) __do_syscall2(n,__scc(a),__scc(b))
+#define __syscall3(n,a,b,c) __do_syscall3(n,__scc(a),__scc(b),__scc(c))
+#define __syscall4(n,a,b,c,d) __do_syscall4(n,__scc(a),__scc(b),__scc(c),__scc(d))
+#define __syscall5(n,a,b,c,d,e) __do_syscall5(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e))
+#define __syscall6(n,a,b,c,d,e,f) __do_syscall6(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),__scc(f))
+#define __syscall7(n,a,b,c,d,e,f,g) __do_syscall7(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
+#define __SYSCALL_NARGS(...) __SYSCALL_NARGS_X(__VA_ARGS__,7,6,5,4,3,2,1,0,)
+#define __SYSCALL_CONCAT_X(a,b) a##b
+#define __SYSCALL_CONCAT(a,b) __SYSCALL_CONCAT_X(a,b)
+#define __SYSCALL_DISP(b,...) __SYSCALL_CONCAT(b,__SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
+#define __syscall(...) __SYSCALL_DISP(__syscall,__VA_ARGS__)
+#define syscall(...) __do_syscall_ret(__syscall(__VA_ARGS__))
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // _MLIBC_SYSCALL_H