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linux-user: mremap(): handle MREMAP_FIXED and MREMAP_MAYMOVE correctly 

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Acked-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5959 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-12-08 18:12:40 +00:00
parent 45bc1f5264
commit f19412a2a6
1 changed files with 28 additions and 6 deletions
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34
linux-user/mmap.c
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@ -537,19 +537,41 @@ int target_munmap(abi_ulong start, abi_ulong len)
return ret;
}
/* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED
blocks which have been allocated starting on a host page */
abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
abi_ulong new_size, unsigned long flags,
abi_ulong new_addr)
{
int prot;
unsigned long host_addr;
void *host_addr;
mmap_lock();
/* XXX: use 5 args syscall */
host_addr = (long)mremap(g2h(old_addr), old_size, new_size, flags);
if (host_addr == -1) {
if (flags & MREMAP_FIXED)
host_addr = mremap(g2h(old_addr), old_size, new_size,
flags, new_addr);
else if (flags & MREMAP_MAYMOVE) {
abi_ulong mmap_start;
mmap_start = mmap_find_vma(0, new_size);
if (mmap_start == -1) {
errno = ENOMEM;
host_addr = MAP_FAILED;
} else
host_addr = mremap(g2h(old_addr), old_size, new_size,
flags | MREMAP_FIXED, g2h(mmap_start));
} else {
host_addr = mremap(g2h(old_addr), old_size, new_size, flags);
/* Check if address fits target address space */
if ((unsigned long)host_addr + new_size > (abi_ulong)-1) {
/* Revert mremap() changes */
host_addr = mremap(g2h(old_addr), new_size, old_size, flags);
errno = ENOMEM;
host_addr = MAP_FAILED;
}
}
if (host_addr == MAP_FAILED) {
new_addr = -1;
} else {
new_addr = h2g(host_addr);