From 92d751f1e7cecd895098232f8dbe235adabbb600 Mon Sep 17 00:00:00 2001 From: Maschell Date: Thu, 28 May 2020 21:52:29 +0200 Subject: [PATCH] first commit --- .gitignore | 10 ++++ Makefile | 142 ++++++++++++++++++++++++++++++++++++++++++++++++ source/kernel.s | 27 +++++++++ source/main.c | 95 ++++++++++++++++++++++++++++++++ 4 files changed, 274 insertions(+) create mode 100644 .gitignore create mode 100644 Makefile create mode 100644 source/kernel.s create mode 100644 source/main.c diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ba57c28 --- /dev/null +++ b/.gitignore @@ -0,0 +1,10 @@ +*.cbp +*.elf +*.layout +*.rpx +build/ +*.save-failed +.idea/ +cmake-build-debug/ +CMakeLists.txt +*.wms diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..4235652 --- /dev/null +++ b/Makefile @@ -0,0 +1,142 @@ +#------------------------------------------------------------------------------- +.SUFFIXES: +#------------------------------------------------------------------------------- + +ifeq ($(strip $(DEVKITPRO)),) +$(error "Please set DEVKITPRO in your environment. export DEVKITPRO=/devkitpro") +endif + +TOPDIR ?= $(CURDIR) + +include $(DEVKITPRO)/wums/share/wums_rules + +WUMS_ROOT := $(DEVKITPRO)/wums +WUT_ROOT := $(DEVKITPRO)/wut +#------------------------------------------------------------------------------- +# TARGET is the name of the output +# BUILD is the directory where object files & intermediate files will be placed +# SOURCES is a list of directories containing source code +# DATA is a list of directories containing data files +# INCLUDES is a list of directories containing header files +#------------------------------------------------------------------------------- +TARGET := KernelModule +BUILD := build +SOURCES := source +DATA := data +INCLUDES := source + +#------------------------------------------------------------------------------- +# options for code generation +#------------------------------------------------------------------------------- +CFLAGS := -g -Wall -O0 -ffunction-sections\ + $(MACHDEP) + +CFLAGS += $(INCLUDE) -D__WIIU__ -D__WUT__ + +CXXFLAGS := $(CFLAGS) -std=c++17 + +ASFLAGS := -g $(ARCH) +LDFLAGS = -g $(ARCH) $(WUMSSPECS) -Wl,-Map,$(notdir $*.map) + +LIBS := -lwums -lwut + +#------------------------------------------------------------------------------- +# list of directories containing libraries, this must be the top level +# containing include and lib +#------------------------------------------------------------------------------- +LIBDIRS := $(PORTLIBS) $(WUT_ROOT) $(WUMS_ROOT) + + +#------------------------------------------------------------------------------- +# no real need to edit anything past this point unless you need to add additional +# rules for different file extensions +#------------------------------------------------------------------------------- +ifneq ($(BUILD),$(notdir $(CURDIR))) +#------------------------------------------------------------------------------- + +export OUTPUT := $(CURDIR)/$(TARGET) +export TOPDIR := $(CURDIR) + +export VPATH := $(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \ + $(foreach dir,$(DATA),$(CURDIR)/$(dir)) + +export DEPSDIR := $(CURDIR)/$(BUILD) + +CFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c))) +CPPFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp))) +SFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s))) +BINFILES := $(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*))) + +#------------------------------------------------------------------------------- +# use CXX for linking C++ projects, CC for standard C +#------------------------------------------------------------------------------- +ifeq ($(strip $(CPPFILES)),) +#------------------------------------------------------------------------------- + export LD := $(CC) +#------------------------------------------------------------------------------- +else +#------------------------------------------------------------------------------- + export LD := $(CXX) +#------------------------------------------------------------------------------- +endif +#------------------------------------------------------------------------------- + +export OFILES_BIN := $(addsuffix .o,$(BINFILES)) +export OFILES_SRC := $(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o) +export OFILES := $(OFILES_BIN) $(OFILES_SRC) +export HFILES_BIN := $(addsuffix .h,$(subst .,_,$(BINFILES))) + +export INCLUDE := $(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \ + $(foreach dir,$(LIBDIRS),-I$(dir)/include) \ + -I$(CURDIR)/$(BUILD) + +export LIBPATHS := $(foreach dir,$(LIBDIRS),-L$(dir)/lib) + +.PHONY: $(BUILD) clean all + +#------------------------------------------------------------------------------- +all: $(BUILD) + +$(BUILD): + @[ -d $@ ] || mkdir -p $@ + @$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile + +#------------------------------------------------------------------------------- +clean: + @echo clean ... + @rm -fr $(BUILD) $(TARGET).rpx $(TARGET).elf + +#------------------------------------------------------------------------------- +else +.PHONY: all + +DEPENDS := $(OFILES:.o=.d) + +#------------------------------------------------------------------------------- +# main targets +#------------------------------------------------------------------------------- +all : $(OUTPUT).wms + +$(OUTPUT).wms : $(OUTPUT).elf +$(OUTPUT).elf : $(OFILES) + +$(OFILES_SRC) : $(HFILES_BIN) + +#------------------------------------------------------------------------------- +# you need a rule like this for each extension you use as binary data +#------------------------------------------------------------------------------- +%.bin.o %_bin.h : %.bin +#------------------------------------------------------------------------------- + @echo $(notdir $<) + @$(bin2o) + +#--------------------------------------------------------------------------------- +%.o: %.s + @echo $(notdir $<) + @$(CC) -MMD -MP -MF $(DEPSDIR)/$*.d -x assembler-with-cpp $(ASFLAGS) -c $< -o $@ $(ERROR_FILTER) + +-include $(DEPENDS) + +#------------------------------------------------------------------------------- +endif +#------------------------------------------------------------------------------- diff --git a/source/kernel.s b/source/kernel.s new file mode 100644 index 0000000..563e7f0 --- /dev/null +++ b/source/kernel.s @@ -0,0 +1,27 @@ +.global SCKernelCopyData +SCKernelCopyData: + // Disable data address translation + mfmsr %r6 + li %r7, 0x10 + andc %r6, %r6, %r7 + mtmsr %r6 + + // Copy data + addi %r3, %r3, -1 + addi %r4, %r4, -1 + mtctr %r5 +SCKernelCopyData_loop: + lbzu %r5, 1(%r4) + stbu %r5, 1(%r3) + bdnz SCKernelCopyData_loop + + // Enable data address translation + ori %r6, %r6, 0x10 + mtmsr %r6 + blr + +.global KernelCopyDataInternal +KernelCopyDataInternal: + li %r0, 0x2500 + sc + blr \ No newline at end of file diff --git a/source/main.c b/source/main.c new file mode 100644 index 0000000..6ee2949 --- /dev/null +++ b/source/main.c @@ -0,0 +1,95 @@ +#include +#include +#include + +#include +#include + +WUMS_MODULE_EXPORT_NAME("homebrew_kernel"); + +#define KERN_SYSCALL_TBL1 0xFFE84C70 //Unknown +#define KERN_SYSCALL_TBL2 0xFFE85070 //Games +#define KERN_SYSCALL_TBL3 0xFFE85470 //Loader +#define KERN_SYSCALL_TBL4 0xFFEAAA60 //Home menu +#define KERN_SYSCALL_TBL5 0xFFEAAE60 //Browser + +extern void SCKernelCopyData(uint32_t dst, uint32_t src, uint32_t len); +extern void KernelCopyDataInternal(uint32_t dst, uint32_t src, uint32_t len); + +void kernelInitialize(); + +extern void KernelCopyData(uint32_t dst, uint32_t src, uint32_t len){ + kernelInitialize(); + KernelCopyDataInternal(dst, src, len); +} +WUMS_EXPORT_FUNCTION(KernelCopyData); + +/* Write a 32-bit word with kernel permissions */ +void __attribute__ ((noinline)) kern_write(void *addr, uint32_t value) { + asm volatile ( + "li 3,1\n" + "li 4,0\n" + "mr 5,%1\n" + "li 6,0\n" + "li 7,0\n" + "lis 8,1\n" + "mr 9,%0\n" + "mr %1,1\n" + "li 0,0x3500\n" + "sc\n" + "nop\n" + "mr 1,%1\n" + : + : "r"(addr), "r"(value) + : "memory", "ctr", "lr", "0", "3", "4", "5", "6", "7", "8", "9", "10", + "11", "12" + ); +} + +/* Read a 32-bit word with kernel permissions */ +uint32_t __attribute__ ((noinline)) kern_read(const void *addr) { + uint32_t result; + asm volatile ( + "li 3,1\n" + "li 4,0\n" + "li 5,0\n" + "li 6,0\n" + "li 7,0\n" + "lis 8,1\n" + "mr 9,%1\n" + "li 0,0x3400\n" + "mr %0,1\n" + "sc\n" + "nop\n" + "mr 1,%0\n" + "mr %0,3\n" + : "=r"(result) + : "b"(addr) + : "memory", "ctr", "lr", "0", "3", "4", "5", "6", "7", "8", "9", "10", + "11", "12" + ); + + return result; +} + +void PatchSyscall(int index, uint32_t addr) { + kern_write((void *) (KERN_SYSCALL_TBL1 + index * 4), addr); + kern_write((void *) (KERN_SYSCALL_TBL2 + index * 4), addr); + kern_write((void *) (KERN_SYSCALL_TBL3 + index * 4), addr); + kern_write((void *) (KERN_SYSCALL_TBL4 + index * 4), addr); + kern_write((void *) (KERN_SYSCALL_TBL5 + index * 4), addr); +} + +void kernelInitialize() { + static uint8_t ucSyscallsSetupRequired = 1; + if (!ucSyscallsSetupRequired){ + return; + } + ucSyscallsSetupRequired = 0; + + PatchSyscall(0x25, (uint32_t) SCKernelCopyData); +} + +int main(int argc, char **argv) { + return 0; +}