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exosphere: properly implement reboot-to-payload

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This commit is contained in:
Michael Scire 2019-01-24 08:12:10 -08:00
parent c9c8f64f09
commit c6f06e2c40
8 changed files with 262 additions and 11 deletions
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13
exosphere/Makefile
View file

@ -76,14 +76,15 @@ export TOPDIR := $(CURDIR)
export VPATH := $(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
$(foreach dir,$(DATA),$(CURDIR)/$(dir)) \
$(TOPDIR)/lp0fw \
$(TOPDIR)/sc7fw
$(TOPDIR)/sc7fw \
$(TOPDIR)/rebootstub
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)/*.*))) sc7fw.bin lp0fw.bin
BINFILES := $(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*))) sc7fw.bin lp0fw.bin rebootstub.bin
#---------------------------------------------------------------------------------
# use CXX for linking C++ projects, CC for standard C
@ -110,7 +111,7 @@ export INCLUDE := $(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
export LIBPATHS := $(foreach dir,$(LIBDIRS),-L$(dir)/lib)
.PHONY: $(BUILD) build_sc7fw build_lp0fw clean all
.PHONY: $(BUILD) build_sc7fw build_lp0fw build_rebootstub clean all
#---------------------------------------------------------------------------------
all: $(BUILD)
@ -121,7 +122,10 @@ check_sc7fw:
check_lp0fw:
@$(MAKE) -C lp0fw all
$(BUILD): check_sc7fw check_lp0fw
check_rebootstub:
@$(MAKE) -C lp0fw all
$(BUILD): check_sc7fw check_lp0fw check_rebootstub
@[ -d $@ ] || mkdir -p $@
@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
@ -130,6 +134,7 @@ clean:
@echo clean ...
@$(MAKE) -C $(TOPDIR)/sc7fw clean
@$(MAKE) -C $(TOPDIR)/lp0fw clean
@$(MAKE) -C $(TOPDIR)/rebootstub clean
@rm -fr $(BUILD) $(TARGET).bin $(TARGET).elf

154
exosphere/rebootstub/Makefile Normal file
View file

@ -0,0 +1,154 @@
#---------------------------------------------------------------------------------
.SUFFIXES:
#---------------------------------------------------------------------------------
ifeq ($(strip $(DEVKITARM)),)
$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
endif
TOPDIR ?= $(CURDIR)
include $(DEVKITARM)/base_rules
#---------------------------------------------------------------------------------
# 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 := $(notdir $(CURDIR))
BUILD := build
SOURCES := src
DATA := data
INCLUDES := include
#---------------------------------------------------------------------------------
# options for code generation
#---------------------------------------------------------------------------------
ARCH := -march=armv4t -mtune=arm7tdmi -mthumb -mthumb-interwork
CFLAGS := \
-g \
-O2 \
-ffunction-sections \
-fdata-sections \
-fomit-frame-pointer \
-fno-inline \
-std=gnu11 \
-Werror \
-Wall \
$(ARCH) $(DEFINES)
CFLAGS += $(INCLUDE) -D__BPMP__
CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11
ASFLAGS := -g $(ARCH)
LDFLAGS = -specs=$(TOPDIR)/linker.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
LIBS :=
#---------------------------------------------------------------------------------
# list of directories containing libraries, this must be the top level containing
# include and lib
#---------------------------------------------------------------------------------
LIBDIRS :=
#---------------------------------------------------------------------------------
# no real need to edit anything past this point unless you need to add additional
# rules for different file extensions
#---------------------------------------------------------------------------------
ifneq ($(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).bin $(TARGET).elf
#---------------------------------------------------------------------------------
else
.PHONY: all
DEPENDS := $(OFILES:.o=.d)
#---------------------------------------------------------------------------------
# main targets
#---------------------------------------------------------------------------------
all : $(OUTPUT).bin
$(OUTPUT).bin : $(OUTPUT).elf
$(OBJCOPY) -S -O binary $< $@
@echo built ... $(notdir $@)
$(OUTPUT).elf : $(OFILES)
%.elf: $(OFILES)
@echo linking $(notdir $@)
@$(LD) $(LDFLAGS) $(OFILES) $(LIBPATHS) $(LIBS) -o $@
@$(NM) -CSn $@ > $(notdir $*.lst)
$(OFILES_SRC) : $(HFILES_BIN)
#---------------------------------------------------------------------------------
# you need a rule like this for each extension you use as binary data
#---------------------------------------------------------------------------------
%.bin.o : %.bin
#---------------------------------------------------------------------------------
@echo $(notdir $<)
@$(bin2o)
-include $(DEPENDS)
#---------------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------------

18
exosphere/rebootstub/linker.ld Normal file
View file

@ -0,0 +1,18 @@
OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
OUTPUT_ARCH(arm)
ENTRY(_start)
SECTIONS
{
. = 0x4003F000;
__start__ = ABSOLUTE(.);
.text : ALIGN(4) { *(.text.start) *(.text*); . = ALIGN(4); }
.rodata : ALIGN(4) { *(.rodata*); . = ALIGN(4); }
.bss : ALIGN(8) { __bss_start__ = .; *(.bss* COMMON); . = ALIGN(8); __bss_end__ = .; }
. = ALIGN(4);
__end__ = ABSOLUTE(.);
}

7
exosphere/rebootstub/linker.specs Normal file
View file

@ -0,0 +1,7 @@
%rename link old_link
*link:
%(old_link) -T %:getenv(TOPDIR /linker.ld) --nmagic --gc-sections
*startfile:
crti%O%s crtbegin%O%s

45
exosphere/rebootstub/src/start.s Normal file
View file

@ -0,0 +1,45 @@
/*
* Copyright (c) 2018 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
.section .text.start
.align 4
.global _start
_start:
b crt0
.global crt0
.type crt0, %function
crt0:
@ clear all registers
ldr r0, =0x52425430 @ RBT0
mov r1, #0x0
mov r2, #0x0
mov r3, #0x0
mov r4, #0x0
mov r5, #0x0
mov r6, #0x0
mov r7, #0x0
mov r8, #0x0
mov r9, #0x0
mov r10, #0x0
mov r11, #0x0
mov r12, #0x0
mov lr, #0x0
ldr sp, =0x40010000
ldr pc, =0x40010000

29
exosphere/src/configitem.c
View file

@ -26,6 +26,14 @@
#include "utils.h"
#include "masterkey.h"
#include "exocfg.h"
#include "smc_ams.h"
#include "arm.h"
#define u8 uint8_t
#define u32 uint32_t
#include "rebootstub_bin.h"
#undef u8
#undef u32
static bool g_battery_profile = false;
static bool g_debugmode_override_user = false, g_debugmode_override_priv = false;
@ -48,11 +56,22 @@ uint32_t configitem_set(bool privileged, ConfigItem item, uint64_t value) {
case REBOOT_KIND_TO_WB_PAYLOAD:
/* Set reboot kind = warmboot. */
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x450ull) = 0x1;
/* Patch bootrom to jump to payload. */
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x630ull) = 0x0010171B; /* Return to bootrom IRAM initialization func. */
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x634ull) = 0x4000FFA4; /* Overwrite bootrom return address on stack. */
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x638ull) = 0x40010000; /* Return to start of payload. */
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x63Cull) = 0x4000FFB4; /* Overwrite bootrom return address on stack. */
/* Patch SDRAM init to perform an SVC immediately after second write */
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x634ull) = 0x2E38DFFF;
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x638ull) = 0x6001DC28;
/* Set SVC handler to jump to reboot stub in IRAM. */
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x520ull) = 0x4003F000;
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_RTC_PMC) + 0x53Cull) = 0x6000F208;
/* Copy reboot stub payload. */
ams_map_irampage(0x4003F000);
for (unsigned int i = 0; i < rebootstub_bin_size; i += 4) {
MAKE_REG32(MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_AMS_IRAM_PAGE) + i) = read32le(rebootstub_bin, i);
}
ams_unmap_irampage();
/* Ensure stub is flushed. */
flush_dcache_all();
break;
default:
return 2;

4
exosphere/src/smc_ams.c
View file

@ -72,7 +72,7 @@ static void ams_unmap_userpage(void) {
lock_release(&g_ams_userpage_mapped);
}
static void ams_map_irampage(uintptr_t iram_address) {
void ams_map_irampage(uintptr_t iram_address) {
lock_acquire(&g_ams_iram_page_mapped);
static const uint64_t irampage_attributes = MMU_PTE_BLOCK_XN | MMU_PTE_BLOCK_INNER_SHAREBLE | ATTRIB_MEMTYPE_DEVICE;
uintptr_t *mmu_l3_tbl = (uintptr_t *)TZRAM_GET_SEGMENT_ADDRESS(TZRAM_SEGMENT_ID_L3_TRANSLATION_TABLE);
@ -80,7 +80,7 @@ static void ams_map_irampage(uintptr_t iram_address) {
tlb_invalidate_page_inner_shareable((void *)AMS_IRAM_PAGE_SECURE_MONITOR_ADDR);
}
static void ams_unmap_irampage(void) {
void ams_unmap_irampage(void) {
uintptr_t *mmu_l3_tbl = (uintptr_t *)TZRAM_GET_SEGMENT_ADDRESS(TZRAM_SEGMENT_ID_L3_TRANSLATION_TABLE);
mmu_unmap_page(mmu_l3_tbl, AMS_IRAM_PAGE_SECURE_MONITOR_ADDR);
tlb_invalidate_page_inner_shareable((void *)AMS_IRAM_PAGE_SECURE_MONITOR_ADDR);

3
exosphere/src/smc_ams.h
View file

@ -21,4 +21,7 @@
uint32_t ams_iram_copy(smc_args_t *args);
void ams_map_irampage(uintptr_t iram_address);
void ams_unmap_irampage(void);
#endif