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linux-user: clock_nanosleep errno Handling on PPC

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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>
This commit is contained in:
Tom Musta 2014-08-12 13:53:41 -05:00 committed by Riku Voipio
parent 0903c8be9e
commit 8fbe8fdfbc
1 changed files with 8 additions and 0 deletions
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8
linux-user/syscall.c
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@ -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)); ret = get_errno(clock_nanosleep(arg1, arg2, &ts, arg4 ? &ts : NULL));
if (arg4) if (arg4)
host_to_target_timespec(arg4, &ts); 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; break;
} }
#endif #endif