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fixed page_unprotect() if host_page_size > TARGET_PAGE_SIZE 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@179 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-05-16 16:07:10 +00:00
parent b409186b8d
commit 1565b7bcd7
1 changed files with 18 additions and 15 deletions
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33
exec.c
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@ -394,26 +394,29 @@ TranslationBlock *tb_alloc(unsigned long pc,
page. Return TRUE if the fault was succesfully handled. */
int page_unprotect(unsigned long address)
{
unsigned int page_index, prot;
PageDesc *p;
unsigned int page_index, prot, pindex;
PageDesc *p, *p1;
unsigned long host_start, host_end, addr;
page_index = address >> TARGET_PAGE_BITS;
p = page_find(page_index);
if (!p)
host_start = address & host_page_mask;
page_index = host_start >> TARGET_PAGE_BITS;
p1 = page_find(page_index);
if (!p1)
return 0;
if ((p->flags & (PAGE_WRITE_ORG | PAGE_WRITE)) == PAGE_WRITE_ORG) {
/* if the page was really writable, then we change its
protection back to writable */
host_start = address & host_page_mask;
host_end = host_start + host_page_size;
prot = 0;
for(addr = host_start; addr < host_end; addr += TARGET_PAGE_SIZE)
prot |= page_get_flags(addr);
host_end = host_start + host_page_size;
p = p1;
prot = 0;
for(addr = host_start;addr < host_end; addr += TARGET_PAGE_SIZE) {
prot |= p->flags;
p++;
}
/* if the page was really writable, then we change its
protection back to writable */
if (prot & PAGE_WRITE_ORG) {
mprotect((void *)host_start, host_page_size,
(prot & PAGE_BITS) | PAGE_WRITE);
p->flags |= PAGE_WRITE;
pindex = (address - host_start) >> TARGET_PAGE_BITS;
p1[pindex].flags |= PAGE_WRITE;
/* and since the content will be modified, we must invalidate
the corresponding translated code. */
tb_invalidate_page(address);