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linux-user: Do early mmap placement only for reserved_va

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For reserved_va, place all non-fixed maps then proceed
as for MAP_FIXED.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Helge Deller <deller@gmx.de>
Message-Id: <20240102015808.132373-21-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-01-02 12:57:55 +11:00
parent 6ecc25570f
commit ad87d26e6b
1 changed files with 7 additions and 5 deletions
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12
linux-user/mmap.c
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@ -540,17 +540,19 @@ static abi_long target_mmap__locked(abi_ulong start, abi_ulong len,
host_offset = offset & -host_page_size;
/*
* If the user is asking for the kernel to find a location, do that
* before we truncate the length for mapping files below.
* For reserved_va, we are in full control of the allocation.
* Find a suitable hole and convert to MAP_FIXED.
*/
if (!(flags & (MAP_FIXED | MAP_FIXED_NOREPLACE))) {
if (reserved_va && !(flags & (MAP_FIXED | MAP_FIXED_NOREPLACE))) {
host_len = len + offset - host_offset;
host_len = ROUND_UP(host_len, host_page_size);
start = mmap_find_vma(real_start, host_len, TARGET_PAGE_SIZE);
start = mmap_find_vma(real_start, host_len,
MAX(host_page_size, TARGET_PAGE_SIZE));
if (start == (abi_ulong)-1) {
errno = ENOMEM;
return -1;
}
start += offset - host_offset;
flags |= MAP_FIXED;
}
/*