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linux-user: Fix handling of arm_fadvise64_64 syscall 

32-bit ARM has an odd variant of the fadvise syscall which has
rearranged arguments, which we try to implement. Unfortunately we got
the rearrangement wrong.

This is a six-argument syscall whose arguments are:
 * fd
 * advise parameter
 * offset high half
 * offset low half
 * len high half
 * len low half

Stop trying to share code with the standard fadvise syscalls,
and just implement the syscall with the correct argument order.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Peter Maydell 2016-05-31 15:45:09 +01:00 committed by Riku Voipio
parent 9e024732f5
commit e0156a9dc4
1 changed files with 11 additions and 11 deletions
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22
linux-user/syscall.c
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@ -9970,18 +9970,18 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
#endif #endif
#ifdef TARGET_NR_arm_fadvise64_64 #ifdef TARGET_NR_arm_fadvise64_64
case TARGET_NR_arm_fadvise64_64: case TARGET_NR_arm_fadvise64_64:
{ /* arm_fadvise64_64 looks like fadvise64_64 but
/* * with different argument order: fd, advice, offset, len
* arm_fadvise64_64 looks like fadvise64_64 but * rather than the usual fd, offset, len, advice.
* with different argument order * Note that offset and len are both 64-bit so appear as
*/ * pairs of 32-bit registers.
abi_long temp; */
temp = arg3; ret = posix_fadvise(arg1, target_offset64(arg3, arg4),
arg3 = arg4; target_offset64(arg5, arg6), arg2);
arg4 = temp; ret = -host_to_target_errno(ret);
} break;
#endif #endif
#if defined(TARGET_NR_fadvise64_64) || defined(TARGET_NR_arm_fadvise64_64) || defined(TARGET_NR_fadvise64) #if defined(TARGET_NR_fadvise64_64) || defined(TARGET_NR_fadvise64)
#ifdef TARGET_NR_fadvise64_64 #ifdef TARGET_NR_fadvise64_64
case TARGET_NR_fadvise64_64: case TARGET_NR_fadvise64_64:
#endif #endif