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myocytebd2
Cheater
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Joined: 23 Apr 2015
Posts: 33
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 Posted: Sun Oct 31, 2021 11:23 pm Post subject: CE 7.3 AA edit "access violation" with c code |
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CE 7.3 AA edit UI often prompt "access violation" with c code.
It usually triggers randomly when moving cursor or scrolling.
Here is one case that always trigger "access violation" for me.
AA edit "access violation":
1. Add bug.CEA to table and open;
2. Move cursor to end of this line , by up/down or mouse click;
3. "access violation" dialog prompts.
| Code: | // Common functions
[ENABLE]
alloc(cCommonCode, 409600)
label(ctCheckDefs)
label*(
registerSymbol(cCommonCode)
registerSymbol(ctCheck)
registerSymbol(ctLog)
registerSymbol(ctInfo)
registerSymbol(ctError)
registerSymbol(ctCheckDefs)
cCommonCode:
db CC CC CC
ctCheck:
{$luacode cond=eax, msgAddr=edx}
cCheck(cond, msgAddr)
{$asm}
ret
db CC CC CC
ctLog:
{$luacode msgAddr=eax}
cLog(msgAddr)
{$asm}
ret
db CC CC CC
ctInfo:
{$luacode msgAddr=eax}
cInfo(msgAddr)
{$asm}
ret
db CC CC CC
ctError:
{$luacode msgAddr=eax}
cError(msgAddr)
{$asm}
ret
db CC CC CC
{$c}
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#define FALSE 0
#define TRUE 1
__attribute__((regparm(2))) void ctCheck(int cond, const char *msg);
__attribute__((regparm(2))) void ctLog(const char *msg);
__attribute__((regparm(2))) void ctInfo(const char *msg);
__attribute__((regparm(2))) void ctError(const char *msg);
#define STR(__arg) #__arg
#define CHECK_SIZE(__theStructType, __sizeExpr) \
if (sizeof(__theStructType) != (__sizeExpr)) { \
char buf[256]; \
snprintf(buf, sizeof(buf), "%s expected size: %u, actual: %u", STR(__theStructType), (__sizeExpr), sizeof(__theStructType)); \
ctCheck(FALSE, buf); \
}
#define CHECK_OFFSET(__theStructType, __m, __offsetExpr) \
if (offsetof(__theStructType, __m) != (__offsetExpr)) { \
char buf[256]; \
snprintf(buf, sizeof(buf), "%s.%s expected offset: %u, actual: %u", STR(__theStructType), STR(__m), (__offsetExpr), offsetof(__theStructType, __m)); \
ctCheck(FALSE, buf); \
}
typedef struct { int a; void *vtable; } DisputationState;
void checkDisputationDefs() {
log("aaaaa");
CHECK_SIZE(DisputationState, 0x4990);
CHECK_OFFSET(DisputationState, vtable, 0);
}
void checkDefs() {
checkDisputationDefs();
}
{$asm}
ctCheckDefs:
{$ccode var=eax}
checkDefs();
{$asm}
ret 4
[DISABLE]
unregisterSymbol(cCommonCode)
unregisterSymbol(ctCheck)
unregisterSymbol(ctLog)
unregisterSymbol(ctInfo)
unregisterSymbol(ctError)
unregisterSymbol(ctCheckDefs)
dealloc(cCommonCode, 409600) |
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Dark Byte
Site Admin
 Reputation: 470
Joined: 09 May 2003
Posts: 25785
Location: The netherlands
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| Posted: Mon Nov 01, 2021 1:09 am Post subject: |
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thanks. it should be fixed on github. (any error, usually lua though, combined with ccode could cause the error)
(also, dealloc doesn't need the size)
_________________
Do not ask me about online cheats. I don't know any and wont help finding them.
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myocytebd2
Cheater
![]() Reputation: 0
Joined: 23 Apr 2015
Posts: 33
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| Posted: Mon Nov 01, 2021 2:43 am Post subject: |
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| Dark Byte wrote: | | (also, dealloc doesn't need the size) |
(the usual consequence of paste alloc to dealloc, lol)
One more question, does x64 c code supports microsoft calling convention?
Tiny cc docs does not mention ms_abi/sysv_abi (and CE does not warn on unsupported attribute, so the situation is not clear to me).
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Dark Byte
Site Admin
Reputation: 470
Joined: 09 May 2003
Posts: 25785
Location: The netherlands
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| Posted: Mon Nov 01, 2021 5:51 am Post subject: |
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it uses the microsoft calling convention when using the windows version
_________________
Do not ask me about online cheats. I don't know any and wont help finding them.
Like my help? Join me on Patreon so i can keep helping |
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