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CMakeLists.txt

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+cmake_minimum_required(VERSION 2.8)
+
+if(NOT DEFINED CMAKE_TOOLCHAIN_FILE)
+  if(DEFINED ENV{VITASDK})
+    set(CMAKE_TOOLCHAIN_FILE "$ENV{VITASDK}/share/vita.toolchain.cmake" CACHE PATH "toolchain file")
+  else()
+    message(FATAL_ERROR "Please define VITASDK to point to your SDK path!")
+  endif()
+endif()
+
+project(LowMemMode)
+include("${VITASDK}/share/vita.cmake" REQUIRED)
+
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wl,-q -Wall -O3 -std=gnu99")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -fno-rtti -fno-exceptions")
+
+include_directories(
+)
+
+link_directories(
+  ${CMAKE_CURRENT_BINARY_DIR}
+)
+
+if (NOT ${RELEASE})
+  add_definitions(-DENABLE_LOGGING)
+endif()
+
+add_executable(LowMemMode
+  LowMemMode.c
+)
+
+target_link_libraries(LowMemMode
+  taihen_stub
+  SceLibKernel_stub
+  SceKernelModulemgr_stub
+)
+
+set_target_properties(LowMemMode
+  PROPERTIES LINK_FLAGS "-nostdlib"
+)
+
+vita_create_self(LowMemMode.suprx LowMemMode
+  CONFIG ${CMAKE_SOURCE_DIR}/LowMemMode.yml
+)

LowMemMode.c

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+#include <taihen.h>
+#include <vitasdk.h>
+#include <psp2/kernel/modulemgr.h> 
+
+static SceUID g_hooks[1];
+uint32_t text_addr, text_size, data_addr, data_size;
+
+void _start() __attribute__ ((weak, alias ("module_start")));
+
+static tai_hook_ref_t ref_hook0;
+static int sub_8126A8CA_patched(int a1, int a2)
+{
+	//Returns > 1 if normal app
+	//Returns 0 if NPXS10015 SceSettings (Launch in PHYMEMLOW mode)
+	//??? Returns < 0 if NPXS10104 SceMiniSettings (Launch in special PHYMEMLOW mode) ???
+	return 0;
+}
+
+int module_start(SceSize argc, const void *args)
+	{
+		tai_module_info_t info;
+		info.size = sizeof(info);
+		int ret = taiGetModuleInfo("SceShell", &info);
+		if (ret < 0) {
+			return SCE_KERNEL_START_FAILED;
+		}
+
+		// Modified from TheOfficialFloW/Adrenaline
+		SceKernelModuleInfo mod_info;
+		mod_info.size = sizeof(SceKernelModuleInfo);
+		ret = sceKernelGetModuleInfo(info.modid, &mod_info);
+		if (ret < 0) {
+			return SCE_KERNEL_START_FAILED;
+		}
+		text_addr = (uint32_t)mod_info.segments[0].vaddr;
+		text_size = (uint32_t)mod_info.segments[0].memsz;
+		data_addr = (uint32_t)mod_info.segments[1].vaddr;
+		data_size = (uint32_t)mod_info.segments[1].memsz;
+
+		int offset;
+
+		switch (info.module_nid) {
+
+		case 0x0552F692: // retail 3.60 SceShell
+			offset = 0x27246E;
+			break;
+
+		case 0x5549BF1F: // retail 3.65 SceShell
+		case 0x34B4D82E: // retail 3.67 SceShell
+		case 0x12DAC0F3: // retail 3.68 SceShell
+			offset = 0x272526;
+			break;
+
+			//For testing
+		case 0x587F9CED: // PTEL 3.65 SceShell
+			offset = 0x26A8CA;
+			break;
+
+		default:
+			return SCE_KERNEL_START_FAILED;
+		}
+  g_hooks[0] = taiHookFunctionOffset(&ref_hook0,
+	  info.modid,
+	  0,          // segidx
+	  offset,     // offset
+	  1,          // thumb
+	  sub_8126A8CA_patched);
+
+  return SCE_KERNEL_START_SUCCESS;
+}
+
+int module_stop(SceSize argc, const void *args) {
+	if (g_hooks[0] >= 0) taiHookRelease(g_hooks[0], ref_hook0);
+  return SCE_KERNEL_STOP_SUCCESS;
+}

LowMemMode.yml

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+LowMemMode:
+  attributes: 0
+  version:
+    major: 1
+    minor: 1
+  main:
+    start: module_start
+    stop: module_stop