amxmodx/amxmodx/natives.cpp
2007-08-04 14:18:56 +00:00

537 lines
13 KiB
C++
Executable File

/* AMX Mod X
*
* by the AMX Mod X Development Team
* originally developed by OLO
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* In addition, as a special exception, the author gives permission to
* link the code of this program with the Half-Life Game Engine ("HL
* Engine") and Modified Game Libraries ("MODs") developed by Valve,
* L.L.C ("Valve"). You must obey the GNU General Public License in all
* respects for all of the code used other than the HL Engine and MODs
* from Valve. If you modify this file, you may extend this exception
* to your version of the file, but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from your
* version.
*/
#include "amxmodx.h"
#include "sh_stack.h"
#include "natives.h"
#include "debugger.h"
#include "libraries.h"
#include "format.h"
#ifdef __linux__
#include <malloc.h>
#include <stdlib.h>
#include <sys/mman.h>
#include "sclinux.h"
#endif
//Written by David "BAILOPAN" Anderson
//With the exception for param_convert, which was written by
// Julien "dJeyL" Laurent
CVector<regnative *> g_RegNatives;
static char g_errorStr[512] = {0};
bool g_Initialized = false;
/* Stack stuff */
regnative *g_pCurNative = NULL;
AMX *g_pCaller = NULL;
cell g_Params[CALLFUNC_MAXPARAMS];
int g_CurError = AMX_ERR_NONE;
int amxx_DynaCallback(int idx, AMX *amx, cell *params)
{
if (idx < 0 || idx >= (int)g_RegNatives.size())
{
LogError(amx, AMX_ERR_NATIVE, "Invalid dynamic native called");
return 0;
}
regnative *pNative = g_RegNatives[idx];
int numParams = params[0] / sizeof(cell);
if (numParams > CALLFUNC_MAXPARAMS)
{
LogError(amx, AMX_ERR_NATIVE, "Called dynanative with too many parameters (%d)", CALLFUNC_MAXPARAMS);
return 0;
}
CPluginMngr::CPlugin *pPlugin = g_plugins.findPluginFast(amx);
CPluginMngr::CPlugin *pNativePlugin = g_plugins.findPluginFast(pNative->amx);
if (!pNativePlugin->isExecutable(pNative->func))
{
LogError(amx, AMX_ERR_NATIVE, "Called dynanative into a paused plugin.");
pPlugin->setStatus(ps_paused);
return 0;
}
/* Save old values on ZE STACK */
AMX *pSaveCaller = g_pCaller;
cell saveParams[CALLFUNC_MAXPARAMS];
regnative *pSaveNative = g_pCurNative;
int saveError = g_CurError;
if (pSaveNative)
{
for (ucell i = 0; i <= g_Params[0] / sizeof(cell); i++)
{
saveParams[i] = g_Params[i];
}
}
/* Save current info */
g_CurError = AMX_ERR_NONE;
g_pCaller = amx;
g_pCurNative = pNative;
int err = 0;
cell ret = 0;
if (pNative->style == 0)
{
amx_Push(pNative->amx, numParams);
amx_Push(pNative->amx, pPlugin->getId());
for (int i=numParams; i>=0; i--)
{
g_Params[i] = params[i];
}
} else if (pNative->style == 1) {
/**
* use dJeyL's system .. very clever!
* NOTE: clever, but doesn't work at all since the JIT does bounds checking
* this should REALLY be deprecated
*/
for (int i=numParams; i>=1; i--)
{
amx_Push(pNative->amx, params[i]);
}
}
Debugger *pDebugger = (Debugger *)pNative->amx->userdata[UD_DEBUGGER];
if (pDebugger)
{
pDebugger->BeginExec();
}
err=amx_Exec(pNative->amx, &ret, pNative->func);
if (err != AMX_ERR_NONE)
{
if (pDebugger && pDebugger->ErrorExists())
{
//don't care
} else if (err != -1) {
//nothing logged the error
LogError(pNative->amx, err, NULL);
}
pNative->amx->error = AMX_ERR_NONE;
//furthermore, log an error in the parent plugin.
LogError(amx, AMX_ERR_NATIVE, "Unhandled dynamic native error");
} else if (g_CurError != AMX_ERR_NONE) {
LogError(amx, g_CurError, g_errorStr);
}
if (pDebugger)
{
pDebugger->EndExec();
}
/* Restore everything */
g_pCurNative = pSaveNative;
g_CurError = saveError;
g_pCaller = pSaveCaller;
if (pSaveNative)
{
for (ucell i = 0; i <= saveParams[0] / sizeof(cell); i++)
{
g_Params[i] = saveParams[i];
}
}
return ret;
}
AMX_NATIVE_INFO *BuildNativeTable()
{
if (g_RegNatives.size() < 1)
{
return NULL;
}
AMX_NATIVE_INFO *pNatives = new AMX_NATIVE_INFO[g_RegNatives.size() + 1];
AMX_NATIVE_INFO info;
regnative *pNative;
for (size_t i=0; i<g_RegNatives.size(); i++)
{
pNative = g_RegNatives[i];
info.name = pNative->name.c_str();
info.func = (AMX_NATIVE)((void *)(pNative->pfn));
pNatives[i] = info;
}
pNatives[g_RegNatives.size()].name = NULL;
pNatives[g_RegNatives.size()].func = NULL;
//this needs to be deleted
return pNatives;
}
static cell AMX_NATIVE_CALL log_error(AMX *amx, cell *params)
{
int len;
char *err = format_amxstring(amx, params, 2, len);
_snprintf(g_errorStr, sizeof(g_errorStr), "%s", err);
g_CurError = params[1];
return 1;
}
//get_string(param, dest[], len)
static cell AMX_NATIVE_CALL get_string(AMX *amx, cell *params)
{
if (!g_pCurNative || (g_pCurNative->amx != amx))
{
LogError(amx, AMX_ERR_NATIVE, "Not currently in a dynamic native");
return 0;
}
if (g_pCurNative->style)
{
LogError(amx, AMX_ERR_NATIVE, "Wrong style of dynamic native");
return 0;
}
int p = params[1];
int len;
char *str = get_amxstring(g_pCaller, g_Params[p], 0, len);
return set_amxstring(amx, params[2], str, params[3]);
}
//set_string(param, source[], maxlen)
static cell AMX_NATIVE_CALL set_string(AMX *amx, cell *params)
{
if (!g_pCurNative || (g_pCurNative->amx != amx))
{
LogError(amx, AMX_ERR_NATIVE, "Not currently in a dynamic native");
return 0;
}
if (g_pCurNative->style)
{
LogError(amx, AMX_ERR_NATIVE, "Wrong style of dynamic native");
return 0;
}
int p = params[1];
int len;
char *str = get_amxstring(amx, params[2], 0, len);
return set_amxstring(g_pCaller, g_Params[p], str, params[3]);
}
//get a byvalue parameter
//get_param(num)
static cell AMX_NATIVE_CALL get_param(AMX *amx, cell *params)
{
if (!g_pCurNative || (g_pCurNative->amx != amx))
{
LogError(amx, AMX_ERR_NATIVE, "Not currently in a dynamic native");
return 0;
}
if (g_pCurNative->style)
{
LogError(amx, AMX_ERR_NATIVE, "Wrong style of dynamic native");
return 0;
}
int p = params[1];
return g_Params[p];
}
//get_param_byref(num)
static cell AMX_NATIVE_CALL get_param_byref(AMX *amx, cell *params)
{
if (!g_pCurNative || (g_pCurNative->amx != amx))
{
LogError(amx, AMX_ERR_NATIVE, "Not currently in a dynamic native");
return 0;
}
if (g_pCurNative->style)
{
LogError(amx, AMX_ERR_NATIVE, "Wrong style of dynamic native");
return 0;
}
int p = params[1];
cell *addr = get_amxaddr(g_pCaller, g_Params[p]);
return addr[0];
}
//set_param_byref(num, val)
static cell AMX_NATIVE_CALL set_param_byref(AMX *amx, cell *params)
{
if (!g_pCurNative || (g_pCurNative->amx != amx))
{
LogError(amx, AMX_ERR_NATIVE, "Not currently in a dynamic native");
return 0;
}
if (g_pCurNative->style)
{
LogError(amx, AMX_ERR_NATIVE, "Wrong style of dynamic native");
return 0;
}
int p = params[1];
cell *addr = get_amxaddr(g_pCaller, g_Params[p]);
addr[0] = params[2];
return 1;
}
//get_array(param, dest[], size)
static cell AMX_NATIVE_CALL get_array(AMX *amx, cell *params)
{
if (!g_pCurNative || (g_pCurNative->amx != amx))
{
LogError(amx, AMX_ERR_NATIVE, "Not currently in a dynamic native");
return 0;
}
if (g_pCurNative->style)
{
LogError(amx, AMX_ERR_NATIVE, "Wrong style of dynamic native");
return 0;
}
int p = params[1];
cell *source = get_amxaddr(g_pCaller, g_Params[p]);
cell *dest = get_amxaddr(amx, params[2]);
int size = params[3];
memcpy(dest, source, size * sizeof(cell));
return 1;
}
//set_array(param, source[], size)
static cell AMX_NATIVE_CALL set_array(AMX *amx, cell *params)
{
if (!g_pCurNative || (g_pCurNative->amx != amx))
{
LogError(amx, AMX_ERR_NATIVE, "Not currently in a dynamic native");
return 0;
}
if (g_pCurNative->style)
{
LogError(amx, AMX_ERR_NATIVE, "Wrong style of dynamic native");
return 0;
}
int p = params[1];
cell *dest = get_amxaddr(g_pCaller, g_Params[p]);
cell *source = get_amxaddr(amx, params[2]);
int size = params[3];
memcpy(dest, source, size * sizeof(cell));
return 1;
}
static cell AMX_NATIVE_CALL vdformat(AMX *amx, cell *params)
{
if (!g_pCurNative || (g_pCurNative->amx != amx))
{
LogError(amx, AMX_ERR_NATIVE, "Not currently in a dynamic native");
return 0;
}
if (g_pCurNative->style)
{
LogError(amx, AMX_ERR_NATIVE, "Wrong style of dynamic native");
return 0;
}
int vargPos = static_cast<int>(params[4]);
int fargPos = static_cast<int>(params[3]);
cell max = g_Params[0] / sizeof(cell);
if (vargPos > (int)max + 1)
{
LogError(amx, AMX_ERR_NATIVE, "Invalid vararg parameter passed: %d", vargPos);
return 0;
}
if (fargPos > (int)max + 1)
{
LogError(amx, AMX_ERR_NATIVE, "Invalid fmtarg parameter passed: %d", fargPos);
return 0;
}
/* get destination info */
cell *fmt;
if (fargPos == 0)
{
if (params[0] / sizeof(cell) != 5)
{
LogError(amx, AMX_ERR_NATIVE, "Expected fmtarg as fifth parameter, found none");
return 0;
}
fmt = get_amxaddr(amx, params[5]);
} else {
fmt = get_amxaddr(g_pCaller, g_Params[fargPos]);
}
cell *realdest = get_amxaddr(amx, params[1]);
size_t maxlen = static_cast<size_t>(params[2]);
cell *dest = realdest;
/* if this is necessary... */
static cell cpbuf[4096];
dest = cpbuf;
/* perform format */
size_t total = atcprintf(dest, maxlen, fmt, g_pCaller, g_Params, &vargPos);
/* copy back */
memcpy(realdest, dest, (total+1) * sizeof(cell));
return total;
}
//This is basically right from dJeyL's lib_convert function
//This awesome hack modifies the stack frame to have an address offset
// that will align to the other plugin's memory.
//I've no idea how he thought of this, but it's great. No idea how well it works.
static cell AMX_NATIVE_CALL param_convert(AMX *amx, cell *params)
{
if (!g_pCurNative || (g_pCurNative->amx != amx))
{
LogError(amx, AMX_ERR_NATIVE, "Not currently in a dynamic native");
return 0;
}
if (g_pCurNative->style != 1)
{
LogError(amx, AMX_ERR_NATIVE, "Wrong style of dynamic native");
return 0;
}
cell p = params[1];
AMX *caller = g_pCaller;
unsigned char *data =amx->base+(int)((AMX_HEADER *)amx->base)->dat;
unsigned char *realdata = caller->base+(int)((AMX_HEADER *)caller->base)->dat;
* (cell *)(data+(int)amx->frm+(p+2)*sizeof(cell)) -= (cell)data-(cell)realdata;
return 1;
}
static cell AMX_NATIVE_CALL register_library(AMX *amx, cell *params)
{
int len;
char *lib = get_amxstring(amx, params[1], 0, len);
AddLibrary(lib, LibType_Library, LibSource_Plugin, g_plugins.findPluginFast(amx));
return 1;
}
//register_native(const name[], const handler[])
static cell AMX_NATIVE_CALL register_native(AMX *amx, cell *params)
{
if (!g_Initialized)
amxx_DynaInit((void *)(amxx_DynaCallback));
g_Initialized = true;
int len;
char *name = get_amxstring(amx, params[1], 0, len);
char *func = get_amxstring(amx, params[2], 1, len);
int idx, err;
if ( (err=amx_FindPublic(amx, func, &idx)) != AMX_ERR_NONE)
{
LogError(amx, err, "Function \"%s\" was not found", func);
return 0;
}
regnative *pNative = new regnative;
pNative->amx = amx;
pNative->func = idx;
//we'll apply a safety buffer too
//make our function
int size = amxx_DynaCodesize();
#ifndef __linux__
DWORD temp;
pNative->pfn = new char[size + 10];
VirtualProtect(pNative->pfn, size+10, PAGE_EXECUTE_READWRITE, &temp);
#else
pNative->pfn = (char *)memalign(sysconf(_SC_PAGESIZE), size+10);
mprotect((void *)pNative->pfn, size+10, PROT_READ|PROT_WRITE|PROT_EXEC);
#endif
int id = (int)g_RegNatives.size();
amxx_DynaMake(pNative->pfn, id);
pNative->func = idx;
pNative->style = params[3];
g_RegNatives.push_back(pNative);
pNative->name.assign(name);
return 1;
}
void ClearPluginLibraries()
{
ClearLibraries(LibSource_Plugin);
for (size_t i=0; i<g_RegNatives.size(); i++)
{
delete [] g_RegNatives[i]->pfn;
delete g_RegNatives[i];
}
g_RegNatives.clear();
}
AMX_NATIVE_INFO g_NativeNatives[] = {
{"register_native", register_native},
{"log_error", log_error},
{"register_library",register_library},
{"get_string", get_string},
{"set_string", set_string},
{"get_param", get_param},
{"get_param_byref", get_param_byref},
{"set_param_byref", set_param_byref},
{"get_array", get_array},
{"set_array", set_array},
//these are dummy functions for floats ;p
{"get_param_f", get_param},
{"get_float_byref", get_param_byref},
{"set_float_byref", set_param_byref},
{"get_array_f", get_array},
{"set_array_f", set_array},
{"vdformat", vdformat},
{"param_convert", param_convert},
//////////////////////////
{NULL, NULL},
};