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authorVolodymyr Boyko <boyko.cxx@gmail.com>2018-11-23 02:19:55 +0200
committerWaldemar Brodkorb <wbx@openadk.org>2018-11-23 14:24:29 +0100
commitfa9cfbfcb70bd3736ec54eeeb4d0796aa4b9521f (patch)
treed1c5c7599703f7024acf6769cdd378e1c0a58b77 /libc/stdio
parentcbfdb7abf4790bac4da52b2161a12bf8abd9f174 (diff)
Defined INLINE_SYSCALL_NOERR_NCS in mips/bits/syscalls.h
On Linux/MIPS (O32 ABI) for system call we have two result registers - v0 and a3. v0 contains actual syscall result on success or error number on fail, a3 set to 0/1 for indicating syscall success/fail. (if a3 == 1, v0 contains errno). Now as we can see from definition of handle_sys (arch/mips/kernel/scall32-o32.S), handler treats returned by syscall function (let's call "original") values in range [-EMAXERRNO; 0[ as -errno, a3 is set to 1 and final returned (to userspace) value is (-original). INLINE_SYSCALL_NOERR_NCS defined in mips/bits/syscalls.h will handle this behaviour. Signed-off-by: Volodymyr Boyko <boyko.cxx@gmail.com>
Diffstat (limited to 'libc/stdio')
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