1 files changed, 86 insertions, 0 deletions
diff --git a/lib/std/os/linux/riscv64.zig b/lib/std/os/linux/riscv64.zig
new file mode 100644
index 0000000000..7bfe0295d3
--- /dev/null
+++ b/lib/std/os/linux/riscv64.zig
@@ -0,0 +1,86 @@
+pub fn syscall0(number: usize) usize {
+    return asm volatile ("ecall"
+        : [ret] "={x10}" (-> usize)
+        : [number] "{x17}" (number)
+        : "memory"
+    );
+}
+
+pub fn syscall1(number: usize, arg1: usize) usize {
+    return asm volatile ("ecall"
+        : [ret] "={x10}" (-> usize)
+        : [number] "{x17}" (number),
+          [arg1] "{x10}" (arg1)
+        : "memory"
+    );
+}
+
+pub fn syscall2(number: usize, arg1: usize, arg2: usize) usize {
+    return asm volatile ("ecall"
+        : [ret] "={x10}" (-> usize)
+        : [number] "{x17}" (number),
+          [arg1] "{x10}" (arg1),
+          [arg2] "{x11}" (arg2)
+        : "memory"
+    );
+}
+
+pub fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) usize {
+    return asm volatile ("ecall"
+        : [ret] "={x10}" (-> usize)
+        : [number] "{x17}" (number),
+          [arg1] "{x10}" (arg1),
+          [arg2] "{x11}" (arg2),
+          [arg3] "{x12}" (arg3)
+        : "memory"
+    );
+}
+
+pub fn syscall4(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
+    return asm volatile ("ecall"
+        : [ret] "={x10}" (-> usize)
+        : [number] "{x17}" (number),
+          [arg1] "{x10}" (arg1),
+          [arg2] "{x11}" (arg2),
+          [arg3] "{x12}" (arg3),
+          [arg4] "{x13}" (arg4)
+        : "memory"
+    );
+}
+
+pub fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
+    return asm volatile ("ecall"
+        : [ret] "={x10}" (-> usize)
+        : [number] "{x17}" (number),
+          [arg1] "{x10}" (arg1),
+          [arg2] "{x11}" (arg2),
+          [arg3] "{x12}" (arg3),
+          [arg4] "{x13}" (arg4),
+          [arg5] "{x14}" (arg5)
+        : "memory"
+    );
+}
+
+pub fn syscall6(
+    number: usize,
+    arg1: usize,
+    arg2: usize,
+    arg3: usize,
+    arg4: usize,
+    arg5: usize,
+    arg6: usize,
+) usize {
+    return asm volatile ("ecall"
+        : [ret] "={x10}" (-> usize)
+        : [number] "{x17}" (number),
+          [arg1] "{x10}" (arg1),
+          [arg2] "{x11}" (arg2),
+          [arg3] "{x12}" (arg3),
+          [arg4] "{x13}" (arg4),
+          [arg5] "{x14}" (arg5),
+          [arg6] "{x15}" (arg6)
+        : "memory"
+    );
+}
+
+pub extern fn clone(func: extern fn (arg: usize) u8, stack: usize, flags: u32, arg: usize, ptid: *i32, tls: usize, ctid: *i32) usize;