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Avoid page_set_flags() assert in qemu-user host page protection code

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V2 that uses endaddr = end-of-guest-address-space if !h2g_valid(endaddr)
after I found out that indeed works; and also disables the FreeBSD 6.x
/compat/linux/proc/self/maps fallback because it can return partial lines
if (at least I think that's the reason) the mappings change between
subsequent read() calls.

Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de>
Acked-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Juergen Lock 2010-03-31 23:00:36 +02:00 committed by Aurelien Jarno
parent 46a183da76
commit 01c0bef162
1 changed files with 7 additions and 6 deletions
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13
exec.c
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@ -307,13 +307,14 @@ static void page_init(void)
if (h2g_valid(endaddr)) {
endaddr = h2g(endaddr);
page_set_flags(startaddr, endaddr, PAGE_RESERVED);
} else {
#if TARGET_ABI_BITS <= L1_MAP_ADDR_SPACE_BITS
endaddr = ~0ul;
page_set_flags(startaddr, endaddr, PAGE_RESERVED);
#else
endaddr = ((abi_ulong)1 << L1_MAP_ADDR_SPACE_BITS) - 1;
#endif
}
page_set_flags(startaddr, endaddr, PAGE_RESERVED);
}
}
free(freep);
@ -324,11 +325,7 @@ static void page_init(void)
last_brk = (unsigned long)sbrk(0);
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
f = fopen("/compat/linux/proc/self/maps", "r");
#else
f = fopen("/proc/self/maps", "r");
#endif
if (f) {
mmap_lock();
@ -344,7 +341,11 @@ static void page_init(void)
if (h2g_valid(endaddr)) {
endaddr = h2g(endaddr);
} else {
#if TARGET_ABI_BITS <= L1_MAP_ADDR_SPACE_BITS
endaddr = ~0ul;
#else
endaddr = ((abi_ulong)1 << L1_MAP_ADDR_SPACE_BITS) - 1;
#endif
}
page_set_flags(startaddr, endaddr, PAGE_RESERVED);
}