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linux-user: Simplify target_madvise 

The trivial length 0 check can be moved up, simplifying some
of the other cases.  The end < start test is handled by
guest_range_valid_untagged.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230707204054.8792-27-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-07-07 21:40:54 +01:00
parent ecb796db03
commit e230ec090b
1 changed files with 4 additions and 15 deletions
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19
linux-user/mmap.c
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@ -900,28 +900,17 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice)
{
abi_ulong len, end;
abi_ulong len;
int ret = 0;
if (start & ~TARGET_PAGE_MASK) {
return -TARGET_EINVAL;
}
len = TARGET_PAGE_ALIGN(len_in);
if (len_in && !len) {
return -TARGET_EINVAL;
}
end = start + len;
if (end < start) {
return -TARGET_EINVAL;
}
if (end == start) {
if (len_in == 0) {
return 0;
}
if (!guest_range_valid_untagged(start, len)) {
len = TARGET_PAGE_ALIGN(len_in);
if (len == 0 || !guest_range_valid_untagged(start, len)) {
return -TARGET_EINVAL;
}