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| author | Volodymyr Boyko <boyko.cxx@gmail.com> | 2018-11-23 02:19:55 +0200 |
|---|---|---|
| committer | Waldemar Brodkorb <wbx@openadk.org> | 2018-11-23 14:24:29 +0100 |
| commit | fa9cfbfcb70bd3736ec54eeeb4d0796aa4b9521f (patch) | |
| tree | d1c5c7599703f7024acf6769cdd378e1c0a58b77 /README | |
| parent | cbfdb7abf4790bac4da52b2161a12bf8abd9f174 (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 'README')
0 files changed, 0 insertions, 0 deletions