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cpu-all.h: Don't accidentally sign extend in g2h() 

Cast the argument of the g2h() macro to a target_ulong so that
it isn't accidentally sign-extended if it is a signed 32 bit
type and long is a 64 bit type. In particular, this fixes a
bug where it would return the wrong value for 32 bit guests
on 64 bit hosts when passed in one of the arg* values from
do_syscall() [which are all abi_long and thus signed types].
This could result in spurious failure of mlock(), among others.

Reviewed-by: Andreas F=E4rber <afaerber@suse.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Peter Maydell 2012-03-09 14:33:20 +00:00 committed by Anthony Liguori
parent 1d3323de5f
commit 8d9dde9429
1 changed files with 1 additions and 1 deletions
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cpu-all.h
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@ -197,7 +197,7 @@ extern unsigned long reserved_va;
#endif
/* All direct uses of g2h and h2g need to go away for usermode softmmu. */
#define g2h(x) ((void *)((unsigned long)(x) + GUEST_BASE))
#define g2h(x) ((void *)((unsigned long)(target_ulong)(x) + GUEST_BASE))
#if HOST_LONG_BITS <= TARGET_VIRT_ADDR_SPACE_BITS
#define h2g_valid(x) 1