diff options
| author | Tom Musta <tommusta@gmail.com> | 2014-08-12 13:53:41 -0500 |
|---|---|---|
| committer | Riku Voipio <riku.voipio@linaro.org> | 2014-08-22 15:06:35 +0300 |
| commit | 8fbe8fdfbc7576c58c59b605354457cc02076304 (patch) | |
| tree | 6443e70ef732d86feb24c3d5908d04a70e8cb698 | |
| parent | 0903c8be9ee7925863c6c50a2096b6e919be861c (diff) | |
linux-user: clock_nanosleep errno Handling on PPC
The clock_nanosleep syscall is unusual in that it returns positive
numbers in error handling situations, versus returning -1 and setting
errno, or returning a negative errno value. On POWER, the kernel will
set the SO bit of CR0 to indicate failure in a syscall. QEMU has
generic handling to do this for syscalls with standard return values.
Add special case code for clock_nanosleep to handle CR0 properly.
Signed-off-by: Tom Musta <tommusta@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
| -rw-r--r-- | linux-user/syscall.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c index ed32f9723f..450f22dcc1 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -9033,6 +9033,14 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, ret = get_errno(clock_nanosleep(arg1, arg2, &ts, arg4 ? &ts : NULL)); if (arg4) host_to_target_timespec(arg4, &ts); + +#if defined(TARGET_PPC) + /* clock_nanosleep is odd in that it returns positive errno values. + * On PPC, CR0 bit 3 should be set in such a situation. */ + if (ret) { + ((CPUPPCState *)cpu_env)->crf[0] |= 1; + } +#endif break; } #endif |