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fixed bug #1535007 - System.dll returns bad values, if function returns short

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git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@4721 212acab6-be3b-0410-9dea-997c60f758d6
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kichik 2006-08-05 11:01:35 +00:00
parent 5cc43bc46d
commit 3131a7d728
1 changed files with 12 additions and 0 deletions
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12
Contrib/System/Source/System.c
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@ -943,6 +943,18 @@ SystemProc __declspec(naked) *CallProc(SystemProc *proc)
SYSTEM_EVENT("\n\t\t\tNear call ")
SYSTEM_LOG_POST;
// workaround for bug #1535007
// http://sf.net/tracker/index.php?func=detail&aid=1535007&group_id=22049&atid=373085
//
// If a function returns short and doesn't clear eax in the process,
// it will only set 2 bytes of eax, and the other 2 bytes remain
// "random". In this case, they'll be part of the proc pointer.
//
// To avoid this, eax is cleared before the function is called. This
// makes sure the value eax will contain is only what the function
// actually sets.
_asm xor eax, eax
_asm
{
// Call