mirrors/qemu
0
0
Fork 0
mirror of https://github.com/qemu/qemu.git synced 2024-11-24 11:23:43 +08:00
Code Issues Packages Projects Releases Wiki Activity

alpha-linux-user: Fix the getpriority syscall

Browse Source 
Alpha uses unbiased priority values in the syscall, with the a3
return value signaling error conditions.  Therefore, properly
interpret the libc getpriority as needed for the guest rather
than passing the host value through unchanged.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2012-06-07 15:14:50 -07:00
parent 0229f5a30e
commit 95c098286b
1 changed files with 15 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
linux-user/syscall.c
View File

@ -218,7 +218,6 @@ _syscall3(int, sys_getdents, uint, fd, struct linux_dirent *, dirp, uint, count)
#if defined(TARGET_NR_getdents64) && defined(__NR_getdents64)
_syscall3(int, sys_getdents64, uint, fd, struct linux_dirent64 *, dirp, uint, count);
#endif
_syscall2(int, sys_getpriority, int, which, int, who);
#if defined(TARGET_NR__llseek) && defined(__NR_llseek)
_syscall5(int, _llseek, uint, fd, ulong, hi, ulong, lo,
loff_t *, res, uint, wh);
@ -6445,10 +6444,21 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
break;
#endif
case TARGET_NR_getpriority:
/* libc does special remapping of the return value of
* sys_getpriority() so it's just easiest to call
* sys_getpriority() directly rather than through libc. */
ret = get_errno(sys_getpriority(arg1, arg2));
/* Note that negative values are valid for getpriority, so we must
differentiate based on errno settings. */
errno = 0;
ret = getpriority(arg1, arg2);
if (ret == -1 && errno != 0) {
ret = -host_to_target_errno(errno);
break;
}
#ifdef TARGET_ALPHA
/* Return value is the unbiased priority. Signal no error. */
((CPUAlphaState *)cpu_env)->ir[IR_V0] = 0;
#else
/* Return value is a biased priority to avoid negative numbers. */
ret = 20 - ret;
#endif
break;
case TARGET_NR_setpriority:
ret = get_errno(setpriority(arg1, arg2, arg3));