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linux-user: Fix NR_fadvise64 and NR_fadvise64_64 for 32-bit guests 

Fix errors in the implementation of NR_fadvise64 and NR_fadvise64_64
for 32-bit guests, which pass their off_t values in register pairs.
We can't use the 64-bit code path for this, so split out the 32-bit
cases, so that we can correctly handle the "only offset is 64-bit"
and "both offset and length are 64-bit" syscall flavours, and
"uses aligned register pairs" and "does not" flavours of target.

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 15:45:10 +01:00 committed by Riku Voipio
parent e0156a9dc4
commit badd3cd880
1 changed files with 40 additions and 0 deletions
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40
linux-user/syscall.c
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@ -9981,6 +9981,44 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
ret = -host_to_target_errno(ret);
break;
#endif
#if TARGET_ABI_BITS == 32
#ifdef TARGET_NR_fadvise64_64
case TARGET_NR_fadvise64_64:
/* 6 args: fd, offset (high, low), len (high, low), advice */
if (regpairs_aligned(cpu_env)) {
/* offset is in (3,4), len in (5,6) and advice in 7 */
arg2 = arg3;
arg3 = arg4;
arg4 = arg5;
arg5 = arg6;
arg6 = arg7;
}
ret = -host_to_target_errno(posix_fadvise(arg1,
target_offset64(arg2, arg3),
target_offset64(arg4, arg5),
arg6));
break;
#endif
#ifdef TARGET_NR_fadvise64
case TARGET_NR_fadvise64:
/* 5 args: fd, offset (high, low), len, advice */
if (regpairs_aligned(cpu_env)) {
/* offset is in (3,4), len in 5 and advice in 6 */
arg2 = arg3;
arg3 = arg4;
arg4 = arg5;
arg5 = arg6;
}
ret = -host_to_target_errno(posix_fadvise(arg1,
target_offset64(arg2, arg3),
arg4, arg5));
break;
#endif
#else /* not a 32-bit ABI */
#if defined(TARGET_NR_fadvise64_64) || defined(TARGET_NR_fadvise64)
#ifdef TARGET_NR_fadvise64_64
case TARGET_NR_fadvise64_64:
@ -10000,6 +10038,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
ret = -posix_fadvise(arg1, arg2, arg3, arg4);
break;
#endif
#endif /* end of 64-bit ABI fadvise handling */
#ifdef TARGET_NR_madvise
case TARGET_NR_madvise:
/* A straight passthrough may not be safe because qemu sometimes