reintroduce hooking based input sampling

Kethen · Apr 28, 2024 · 67e6ec8 · 67e6ec8
1 parent 6c96025
commit 67e6ec8
Showing 1 changed file with 83 additions and 3 deletions.
diff --git a/main.c b/main.c
@@ -135,6 +135,80 @@ u32 offset_populate_car_analog_control = 0;
   ptr = (void *)patch_buffer; \
 }
 
+// XXX ppsspp loading savestate reloads module imports and overwrites this kind of hooking in case HLE
+// syscall changed
+// https://github.com/hrydgard/ppsspp/blob/master/Core/HLE/sceKernelModule.cpp
+// if this kind of hooking on ppsspp cannot be avoided, repatch in a slow thread loop maybe, at least peek
+// can be used instead for this particular plugin
+
+// jacking JR_SYSCALL in ppsspp, so just save the two instructions, instead of seeking the target
+// also scan other modules for the same pattern and patch them if ppsspp
+// for real hw, go the jump target then attempt the more standard two instructions hijack
+// hopefully works with the static args loaded sceCtrl functions, at least referencing uofw and joysens
+#define HIJACK_SYSCALL_STUB(a, f, ptr) \
+{ \
+  LOG("hijacking syscall stub at 0x%lx with 0x%lx", (u32)a, (u32)f); \
+  u32 _func_ = (u32)a; \
+  LOG("original instructions: 0x%lx 0x%lx", _lw(_func_), _lw(_func_ + 4)); \
+  u32 pattern[2]; \
+  _sw(_lw(_func_), (u32)pattern); \
+  _sw(_lw(_func_ + 4), (u32)pattern + 4); \
+  u32 ff = (u32)f; \
+  if(!is_emulator){ \
+    _func_ = GET_JUMP_TARGET(_lw(_func_)); \
+    LOG("real hardware mode, retargetting function 0x%lx", _func_); \
+    LOG("original instructions: 0x%lx 0x%lx", _lw(_func_), _lw(_func_ + 4)); \
+  } \
+  static u32 patch_buffer[3]; \
+  if(is_emulator){ \
+    _sw(_lw(_func_), (u32)patch_buffer); \
+    _sw(_lw(_func_ + 4), (u32)patch_buffer + 4); \
+  }else{ \
+    _sw(_lw(_func_), (u32)patch_buffer); \
+    _sw(_lw(_func_ + 4), (u32)patch_buffer + 8); \
+    MAKE_JUMP((u32)patch_buffer + 4, _func_ + 8); \
+  } \
+  _sw(0x08000000 | (((u32)(ff) >> 2) & 0x03FFFFFF), _func_); \
+  _sw(0, _func_ + 4); \
+  ptr = (void *)patch_buffer; \
+  if(is_emulator){ \
+    SceUID modules[32]; \
+    SceKernelModuleInfo info; \
+    int i, count = 0; \
+    if (sceKernelGetModuleIdList(modules, sizeof(modules), &count) >= 0) { \
+      for (i = 0; i < count; i++) { \
+        info.size = sizeof(SceKernelModuleInfo); \
+        if (sceKernelQueryModuleInfo(modules[i], &info) < 0) { \
+          continue; \
+        } \
+        if (strcmp(info.name, MODULE_NAME) == 0) { \
+          continue; \
+        } \
+        LOG("scanning module %s in ppsspp mode", info.name); \
+        LOG("info.text_addr: 0x%x info.text_size: 0x%x info.nsegment: 0x%x", info.text_addr, info.text_size, (int)info.nsegment); \
+        u32 j; \
+        for(j = 0;j < info.nsegment; j++){ \
+          LOG("info.segmentaddr[%ld]: 0x%x info.segmentsize[%ld]: 0x%x", j, info.segmentaddr[j], j, info.segmentsize[j]); \
+        } \
+        if(info.text_size == 0){ \
+          if(info.nsegment >= 1 && info.segmentaddr[0] == info.text_addr){ \
+            info.text_size = info.segmentsize[0]; \
+          } \
+        } \
+        u32 k; \
+        for(k = 0; k < info.text_size; k+=4){ \
+          u32 addr = k + info.text_addr; \
+          if(/*_lw((u32)pattern) == _lw(addr + 0) &&*/ _lw((u32)pattern + 4) == _lw(addr + 4)){ \
+            LOG("found instruction pattern 0x%lx 0x%lx at 0x%lx, patching", pattern[0], pattern[1], addr); \
+            _sw(0x08000000 | (((u32)(ff) >> 2) & 0x03FFFFFF), addr); \
+            _sw(0, addr + 4); \
+          } \
+        } \
+      } \
+    } \
+  } \
+}
+
 static int get_disc_id_version(char *id_out, char *version_out){
 	char *sfo_path = "disc0:/PSP_GAME/PARAM.SFO";
 	int fd = sceIoOpen(sfo_path, PSP_O_RDONLY,0);
@@ -490,9 +564,11 @@ void populate_car_analog_control_patched(u32 param_1, int *param_2, unsigned cha
 
 	int k1 = pspSdkSetK1(0);
 
-	SceCtrlData pad_data;
-	int res = sceCtrlPeekBufferPositive(&pad_data, 1);
-	sample_input(&pad_data, res, 0);
+	if(is_emulator){
+		SceCtrlData pad_data;
+		int res = sceCtrlPeekBufferPositive(&pad_data, 1);
+		sample_input(&pad_data, res, 0);
+	}
 
 	int mode;
 	sceCtrlGetSamplingMode(&mode);
@@ -604,6 +680,10 @@ int init(){
 	//HIJACK_FUNCTION(offset_populate_car_digital_control, populate_car_digital_control_patched, populate_car_digital_control_orig);
 	HIJACK_FUNCTION(offset_populate_car_analog_control, populate_car_analog_control_patched, populate_car_analog_control_orig);
 
+	if(!is_emulator){
+		HIJACK_SYSCALL_STUB((u32)sceCtrlReadBufferPositive, sceCtrlReadBufferPositivePatched, sceCtrlReadBufferPositiveOrig);
+	}
+
 	sceKernelDcacheWritebackAll();
 	sceKernelIcacheClearAll();