From: "Joseph S. Myers" <joseph@xxxxxxxxxxxxxxxx> Date: Mon, 4 Jun 2007 20:56:57 +0000 (UTC) [ added linux-arch which is a great place to discuss these kinds of issues. ] > What should the kernel syscall ABI be in such cases (any case where the > syscall implementations expect arguments narrower than registers, so > mainly 32-bit arguments on 64-bit platforms)? There are two obvious > possibilities: In general we've taken the stance that the syscall dispatch should create the proper calling environment for C code implementing the system calls, and this thus means properly sign and zero extending the arguments as expected by the C calling convention.
