[libc-commits] [libc] [libc] provide binary compatibility with syscall symbol (PR #117229)

[Michael Jones via libc-commits]

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@@ -0,0 +1,32 @@
+//===-- Linux implementation of syscall (va compat) -----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/unistd/syscall_compat.h"
+#include "src/__support/common.h"
+#include "src/unistd/syscall.h"
+
+#include "src/__support/macros/config.h"
+#include <stdarg.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+#undef syscall
+LLVM_LIBC_FUNCTION(long, syscall, (long n, ...)) {
+  va_list args;
+  va_start(args, n);
+  long arg1 = va_arg(args, long);
+  long arg2 = va_arg(args, long);
+  long arg3 = va_arg(args, long);
+  long arg4 = va_arg(args, long);
+  long arg5 = va_arg(args, long);
+  long arg6 = va_arg(args, long);
+  va_end(args);
+  return __llvm_libc_syscall(n, arg1, arg2, arg3, arg4, arg5, arg6);
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michaelrj-google wrote:

this should call the internal `syscall_impl` instead of the public syscall function.

https://github.com/llvm/llvm-project/pull/117229