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-rw-r--r--libc/sysdeps/linux/common/bits/syscalls-common.h81
-rw-r--r--libc/sysdeps/linux/common/bits/syscalls.h3
2 files changed, 83 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/common/bits/syscalls-common.h b/libc/sysdeps/linux/common/bits/syscalls-common.h
new file mode 100644
index 000000000..81c82c801
--- /dev/null
+++ b/libc/sysdeps/linux/common/bits/syscalls-common.h
@@ -0,0 +1,81 @@
+/*
+ * Common syscall type defines
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _SYSCALLS_COMMON_H
+#define _SYSCALLS_COMMON_H 1
+
+#ifndef _SYSCALL_H
+# error "Never use <bits/syscalls-common.h> directly; include <sys/syscall.h> instead."
+#endif
+
+#ifndef SYS_ify
+# define SYS_ify(syscall_name) (__NR_##syscall_name)
+#endif
+
+#ifndef __ASSEMBLER__
+
+#include <errno.h>
+
+#ifndef INTERNAL_SYSCALL_DECL
+# define INTERNAL_SYSCALL_DECL(err) do { } while (0)
+#endif
+#ifndef INTERNAL_SYSCALL_ERROR_P
+# define INTERNAL_SYSCALL_ERROR_P(val, err) ((unsigned long)val >= (unsigned long)(-4095))
+#endif
+#ifndef INTERNAL_SYSCALL_ERRNO
+# define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
+#endif
+
+/* Define a macro which expands into the inline wrapper code for a system call */
+#ifndef INLINE_SYSCALL
+# define INLINE_SYSCALL(name, nr, args...) \
+({ \
+ INTERNAL_SYSCALL_DECL(err); \
+ long res = INTERNAL_SYSCALL(name, err, nr, args); \
+ if (unlikely(INTERNAL_SYSCALL_ERROR_P(res, err))) { \
+ __set_errno(INTERNAL_SYSCALL_ERRNO(res, err)); \
+ res = -1L; \
+ } \
+ res; \
+})
+#endif
+
+#ifndef _syscall0
+
+#define C_DECL_ARGS_0() void
+#define C_DECL_ARGS_1(t, v) t v
+#define C_DECL_ARGS_2(t, v, args...) t v, C_DECL_ARGS_1(args)
+#define C_DECL_ARGS_3(t, v, args...) t v, C_DECL_ARGS_2(args)
+#define C_DECL_ARGS_4(t, v, args...) t v, C_DECL_ARGS_3(args)
+#define C_DECL_ARGS_5(t, v, args...) t v, C_DECL_ARGS_4(args)
+#define C_DECL_ARGS_6(t, v, args...) t v, C_DECL_ARGS_5(args)
+
+#define C_ARGS_0()
+#define C_ARGS_1(t, v) v
+#define C_ARGS_2(t, v, args...) v, C_ARGS_1(args)
+#define C_ARGS_3(t, v, args...) v, C_ARGS_2(args)
+#define C_ARGS_4(t, v, args...) v, C_ARGS_3(args)
+#define C_ARGS_5(t, v, args...) v, C_ARGS_4(args)
+#define C_ARGS_6(t, v, args...) v, C_ARGS_5(args)
+
+#define SYSCALL_FUNC(nargs, type, name, args...) \
+type name(C_DECL_ARGS_##nargs(args)) { \
+ return (type)INLINE_SYSCALL(name, nargs, C_ARGS_##nargs(args)); \
+}
+
+#define _syscall0(args...) SYSCALL_FUNC(0, args)
+#define _syscall1(args...) SYSCALL_FUNC(1, args)
+#define _syscall2(args...) SYSCALL_FUNC(2, args)
+#define _syscall3(args...) SYSCALL_FUNC(3, args)
+#define _syscall4(args...) SYSCALL_FUNC(4, args)
+#define _syscall5(args...) SYSCALL_FUNC(5, args)
+#define _syscall6(args...) SYSCALL_FUNC(6, args)
+
+#endif /* _syscall0 */
+
+#endif /* __ASSEMBLER__ */
+
+#endif
diff --git a/libc/sysdeps/linux/common/bits/syscalls.h b/libc/sysdeps/linux/common/bits/syscalls.h
index ceba568e5..e7c6b035d 100644
--- a/libc/sysdeps/linux/common/bits/syscalls.h
+++ b/libc/sysdeps/linux/common/bits/syscalls.h
@@ -5,4 +5,5 @@
* forbidden. Don't do it. It is bad for you.
*/
-#error You have not provided architecture specific _syscall[0-6] macros
+#error You have not provided architecture specific bits/syscalls.h
+#error You should need to define only INTERNAL_SYSCALL