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workaround for msvc optimizing away stack usage on detour

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This commit is contained in:
David Anderson 2007-08-16 16:30:16 +00:00
parent 0bb430b3eb
commit 639db5846e
1 changed files with 9 additions and 11 deletions
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20
dlls/cstrike/cstrike/CstrikeHacks.cpp
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@ -15,7 +15,7 @@ bool UTIL_GetLibraryOfAddress(void *memInBase, char *buffer, size_t maxlength);
/* Detours */ /* Detours */
void CtrlDetour_ClientCommand(bool set); void CtrlDetour_ClientCommand(bool set);
void Detour_ClientCommand(edict_t *pEdict, int retVal); int Detour_ClientCommand(edict_t *pEdict);
int g_CSCliCmdFwd = -1; int g_CSCliCmdFwd = -1;
int *g_UseBotArgs = NULL; int *g_UseBotArgs = NULL;
@ -45,20 +45,17 @@ void CtrlDetour_ClientCommand(bool set)
static unsigned char DetourOps[] = static unsigned char DetourOps[] =
{ {
'\x50', /* push eax ; just for safety */ '\x50', /* push eax ; just for safety */
'\x68', '\x00', '\x00', '\x00', '\x00', /* push 0 ; space to store override rule */ '\xff', '\x74', '\x24', '\x08', /* push [esp+0x8] ; push the edict pointer */
'\xff', '\x74', '\x24', '\x0C', /* push [esp+0xC] ; push the edict pointer */
'\xe8', '\x00', '\x00', '\x00', '\x00', /* call <gate> ; call our function */ '\xe8', '\x00', '\x00', '\x00', '\x00', /* call <gate> ; call our function */
'\x58', /* pop eax ; remove 3rd push */ '\x83', '\xc4', '\x08', /* add esp, 8 ; correct stack */
'\x58', /* pop eax ; remove 2nd push */ '\x85', '\xc0', /* test eax, eax ; do != 0 test */
'\x85', '\xc0', /* test eax, eax ; do != 0 test now, flags will be saved */
'\x58', /* pop eax ; remove 1st push */
'\x74', '\x01', /* je <cont> ; if == 0, jump to where old func is saved */ '\x74', '\x01', /* je <cont> ; if == 0, jump to where old func is saved */
'\xc3' /* ret ; return otherwise */ '\xc3' /* ret ; return otherwise */
}; };
static unsigned char DetourJmp = '\xE9'; static unsigned char DetourJmp = '\xE9';
const unsigned int DetourBytes = 23; const unsigned int DetourBytes = 18;
const unsigned int DetourCallPos = 11; const unsigned int DetourCallPos = 6;
const unsigned int DetourJmpPos = DetourBytes + CS_DETOURCOPYBYTES_CLIENTCOMMAND; const unsigned int DetourJmpPos = DetourBytes + CS_DETOURCOPYBYTES_CLIENTCOMMAND;
const unsigned int DetourJmpBytes = 5; const unsigned int DetourJmpBytes = 5;
static unsigned char *FullDetour = NULL; static unsigned char *FullDetour = NULL;
@ -130,14 +127,15 @@ void CtrlDetour_ClientCommand(bool set)
} }
} }
void Detour_ClientCommand(edict_t *pEdict, int retVal) int Detour_ClientCommand(edict_t *pEdict)
{ {
if (*g_UseBotArgs) if (*g_UseBotArgs)
{ {
int client = ENTINDEX(pEdict); int client = ENTINDEX(pEdict);
const char *args = *g_BotArgs; const char *args = *g_BotArgs;
retVal = MF_ExecuteForward(g_CSCliCmdFwd, (cell)client, args); return MF_ExecuteForward(g_CSCliCmdFwd, (cell)client, args);
} }
return 0;
} }
unsigned char *UTIL_CodeAlloc(size_t size) unsigned char *UTIL_CodeAlloc(size_t size)