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Mark host brk() area as reserved.

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4637 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
pbrook 2008-05-31 16:33:53 +00:00
parent 1090e7a2c6
commit 0776590d70
3 changed files with 18 additions and 0 deletions
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1
exec.c
View File

@ -234,6 +234,7 @@ static void page_init(void)
FILE *f;
int n;
last_brk = (unsigned long)sbrk(0);
f = fopen("/proc/self/maps", "r");
if (f) {
do {

16
linux-user/mmap.c
View File

@ -157,6 +157,8 @@ static abi_ulong mmap_next_start = 0x18000000;
static abi_ulong mmap_next_start = 0x40000000;
#endif
unsigned long last_brk;
/* find a free memory area of size 'size'. The search starts at
'start'. If 'start' == 0, then a default start address is used.
Return -1 if error.
@ -167,6 +169,20 @@ static abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
{
abi_ulong addr, addr1, addr_start;
int prot;
unsigned long new_brk;
new_brk = (unsigned long)sbrk(0);
if (last_brk && last_brk < new_brk && last_brk == (target_ulong)last_brk) {
/* This is a hack to catch the host allocating memory with brk().
If it uses mmap then we loose.
FIXME: We really want to avoid the host allocating memory in
the first place, and maybe leave some slack to avoid switching
to mmap. */
page_set_flags(last_brk & TARGET_PAGE_MASK,
TARGET_PAGE_ALIGN(new_brk),
PAGE_RESERVED);
}
last_brk = new_brk;
size = HOST_PAGE_ALIGN(size);
start = start & qemu_host_page_mask;

1
linux-user/qemu.h
View File

@ -232,6 +232,7 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
abi_ulong new_size, unsigned long flags,
abi_ulong new_addr);
int target_msync(abi_ulong start, abi_ulong len, int flags);
extern unsigned long last_brk;
/* user access */