1 files changed, 117 insertions, 0 deletions
diff --git a/lib/libc/include/sys/syscall.h b/lib/libc/include/sys/syscall.h
new file mode 100644
index 0000000..b5e5fc2
--- /dev/null
+++ b/lib/libc/include/sys/syscall.h
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SYS_SYSCALL_H
+#define _SYS_SYSCALL_H
+
+#if !defined(__ASSEMBLER__)
+#include <stdint.h>
+#endif
+
+#define SYS_debug 0
+#define SYS_exit  1
+
+#if !defined(__ASSEMBLER__)
+__attribute__((__always_inline__))
+static inline long
+syscall0(uint64_t code)
+{
+    volatile long ret;
+    asm volatile("int $0x80" : "=a"(ret) : "a"(code));
+    return ret;
+}
+
+__attribute__((__always_inline__))
+static inline long
+syscall1(uint64_t code, uint64_t arg0)
+{
+    volatile long ret;
+    asm volatile("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0) : "memory");
+    return ret;
+}
+
+__attribute__((__always_inline__))
+static long inline
+syscall2(uint64_t code, uint64_t arg0, uint64_t arg1)
+{
+    volatile long ret;
+    asm volatile("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0), "S"(arg1) : "memory");
+    return ret;
+}
+
+__attribute__((__always_inline__))
+static inline long
+syscall3(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2)
+{
+    volatile long ret;
+    asm volatile("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0), "S"(arg1), "d"(arg2) : "memory");
+    return ret;
+}
+
+__attribute__((__always_inline__))
+static inline long
+syscall4(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3)
+{
+    volatile long ret;
+    register uint64_t _arg3 asm("r10") = arg3;
+    asm volatile("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0), "S"(arg1), "d"(arg2), "r"(_arg3) : "memory");
+    return ret;
+}
+
+__attribute__((__always_inline__))
+static inline long
+syscall5(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4)
+{
+    volatile long ret;
+    register uint64_t _arg3 asm("r10") = arg3;
+    register uint64_t _arg4 asm("r9") = arg4;
+    asm volatile("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0), "S"(arg1), "d"(arg2), "r"(_arg3), "r"(_arg4) : "memory");
+    return ret;
+}
+
+__attribute__((__always_inline__))
+static inline long
+syscall6(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5) {
+    volatile long ret;
+    register uint64_t _arg3 asm("r10") = arg3;
+    register uint64_t _arg4 asm("r9") = arg4;
+    register uint64_t _arg5 asm("r8") = arg5;
+    asm volatile("int $0x80" : "=a"(ret) : "a"(code), "D"(arg0), "S"(arg1), "d"(arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) : "memory");
+    return ret;
+}
+
+#define _SYSCALL_N(a0, a1, a2, a3, a4, a5, a6, name, ...) \
+    name
+
+#define syscall(...) \
+_SYSCALL_N(__VA_ARGS__, syscall6, syscall5, \
+            syscall4, syscall3, syscall2, syscall1, \
+            syscall0)(__VA_ARGS__)
+#endif  /* !defined(__ASSEMBLER__) */
+#endif  /* !_SYS_SYSCALL_H */