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bushing 2011-06-20 16:11:10 -07:00
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Makefile Normal file
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include starlet.mk
CFLAGS = -fpic -mbig-endian -mthumb -march=armv5t -mthumb-interwork -fomit-frame-pointer -Os
LDFLAGS += -fpic -mbig-endian -mthumb -march=armv5t -mthumb-interwork -fomit-frame-pointer
LDSCRIPT = babelfish.ld
LIBS = -lgcc
TARGET = babelfish.elf
TARGET_BIN = babelfish.bin
DATA = vectors.bin.o
OBJS = start.o babelfish.o utils.o gecko.o memory.o memory_asm.o $(DATA)
include common.mk
all: $(TARGET_BIN)
babelfish.o: babelfish.c vectors.bin.o
%.bin.o: %.bin
@$(bin2o)
# vectors contains our SWI replacement that outputs debug stuff over USBGecko
vectors.bin: vectors.elf
$(OBJCOPY) -O binary vectors.elf vectors.bin
vectors.elf: vectors.o
$(LD) -EB -Ttext=0 -o vectors.elf vectors.o
vectors.o: vectors.s
$(AS) -o vectors.o vectors.s
$(TARGET_BIN): $(TARGET)
@echo " OBJCPY $@"
@$(OBJCOPY) -O binary $< $@
clean: myclean
myclean:
-rm -f $(TARGET_BIN) vectors.elf vectors.bin vectors_bin.h vectors.o babelfish.map

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README Normal file
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This is babelfish, a just-in-time self-propagting IOS patcher for the Nintendo Wii.
Background:
The Wii poses a peculiar architectural challenge when it comes to
modifying firmware. Instead of having one firmware binary to patch,
the Wii keeps 20+ slightly incompatible versions of IOS around in
NAND; it reloads the firmware entirely (often to a different version)
when a new title is launched. This makes it difficult to permanently
modify the behavior (e.g. preventing a bootloader update) because
firmware is frequently reloaded.
The most naive approach to solving this is to patch every single
version of the firmware in NAND; this is done by e.g. CIOSCORP. This
approach is unacceptable for two reasons:
1) Any failure in patching could either leave a system unbootable (and
bricked), or could fail to apply the desired protection
2) Any update will wipe out some of the patched firmwares. It's
possible to disable firmware updates by various methods, but it's
still ugly.
A better solution was necessary, so I started working on a piece of
code that could stay resident between IOS reloads -- it would have to
transfer itself along with each new version of IOS. "IOS Virus" was
the first term that came to mind, but that has a negative connotation;
I chose "Babelfish" to express the benevolent intent of this software. (See
http://en.wikipedia.org/wiki/Babel_fish_(The_Hitchhiker%27s_Guide_to_the_Galaxy))
Theory of operation:
In order for this to work, we need two things:
1) An ability to consistently patch any IOS
2) An ability to patch any IOS when it gets loaded
To simplify this task, a few assumptions have been made:
1) All versions of IOS have an ELF loader in the beginning of the
image, which we may safely replace with our own loader
2) All versions of IOS have a predictable syscall structure, which
allows us to hook the right events
3) There is one safe, unused area of memory that we can "hide" a copy
of ourself without getting overwritten when IOS is reloaded
4) We can make patches that are generic enough that they work on all
versions of IOS.
As long as these are all true, then we can implement our code as a
replacement ELF loader; our loader also has the capability to patch
binaries as it loads them. One of the patches it does is ... to hook
something* in the IOS reload path to replace the new IOS's loader with
a stashed copy of ourself before jumping to it.
The other patches it makes are just there to make life more
interesting; the most useful one is a patch to SVC call #4 to redirect
the normally /dev/nulled IOS debug output to USBGecko.
Usage:
After compiling Babelfish, you will end up with a babelfish.bin, which
is a replacement ELF loader that can be used with any version of IOS,
including boot2. One easy way to use it is to take boot2v4, replace
the ELF loader with babelfish and use BootMii to load it as
armboot.bin. After that, if all works well, it will stay resident in
memory until the system is powered down.
Known limitations and bugs:
1) This code is somewhat old, and was written before we found
HW_AHBPROT; some of this may no longer be necessary.
2) There are several fragile points highlighted in the code, such as
the maximum code size / stack size, reload_ios/xchange_osvers,
syscall numbering, etc.
3) PPC patching "almost" works.
4) It won't survive a reboot to GameCube mode or through BootMii.
5) You probably have to have a USBGecko to get any use out of this.
6) There are several different patching strategies employed; it might
be nice to clean up and/or refactor that code.
Safety notes:
Despite the Rube-Goldberg patching mechanism involved here, Babelfish
should pratically always be safer for your Wii than patching firmware
in flash. The only dangerous scenario I can think of is that any
patches you make to the FFS driver may cause NAND to be corrupted in a
way that "vanilla" IOS doesn't undestand, which will cause IOS to
break if Babelfish fails to load. Just be extra careful when touching
any code that deals with NAND unless you have BootMii/boot2 installed
with a recent NAND flash backup.bin.

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babelfish.c Normal file
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/*
babelfish - self-propagating Just-In-Time IOS patcher
Copyright (C) 2008-2011 Haxx Enterprises <bushing@gmail.com>
This code is licensed to you under the terms of the GNU GPL, version 2;
see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
This code lives at http://gitweb.bootmii.org/?p=babelfish.git
*/
#include "types.h"
#include "utils.h"
#include "hollywood.h"
#include "elf.h"
#include "gecko.h"
#include "vectors_bin.h"
#define DEBUG 1
/* Known issues:
MEMHOLE_ADDR was picked by looking at the ELF headers for a few versions of IOS
some spot that wasn't used; it would be better to programmatically determine
this while reloading IOS, and move it around as necessary.
PPC patching doesn't work, see below. Half of the code here is for PPC patching,
it'd sure be nice if it worked (or we should get rid of it if we can't fix it)
syscall numbering might change between IOS versions, need to check this
Need to hook two different places for patching, depending on the IOS version --
we should either find a better place, or automatically choose the correct one
We freak out if we try to reload MINI.
Big chunks of this code could be cleaned up and/or refactored, probably.
*/
/* CONFIG OPTIONS */
#define USE_RELOAD_IOS /* as opposed to hooking xchange_osvers -- only works on newer versions of IOS? */
/* XXX this shouldn't be hardcoded, and if you change it it must also change in start.S and babelfish.ld! */
/* This is where we save a copy of ourselves to use when we reload into a new IOS */
#define MEMHOLE_ADDR 0x13A80000
/* We should be able to use this framework to patch PPC code, but I can't get it to work.
Either it thinks it's patched code (but the PPC doesn't see the updated code), or it hangs the PPC.
I spent a couple of weeks trying to get this to work, but failed --
I'd really like it if someone fixed this. :)
*/
// #define PPCHAX
/* END CONFIG OPTIONS */
#ifdef PPCHAX // save space if we're not going to try to patch PPC code
/* This is a patch to __fwrite in the Nintendo SDK to redirect all output to USBGecko */
static u32 fwrite_patch[] = {
0x7c8429d6, 0x39400000, 0x9421fff0, 0x93e1000c, 0x7f8a2000, 0x409c0064,
0x3d00cd00, 0x3d60cd00, 0x3d20cd00, 0x61086814, 0x616b6824, 0x61296820,
0x398000d0, 0x38c00019, 0x38e00000, 0x91880000, 0x7c0350ae, 0x5400a016,
0x6400b000, 0x900b0000, 0x90c90000, 0x80090000, 0x701f0001, 0x4082fff8,
0x800b0000, 0x90e80000, 0x540037fe, 0x7d4a0214, 0x7f8a2000, 0x419cffc8,
0x7ca32b78, 0x83e1000c, 0x38210010, 0x4e800020
};
static u32 sig_fwrite[] = {
0x9421FFD0,
0x7C0802A6,
0x90010034,
0xBF210014,
0x7C9B2378,
0x7CDC3378,
0x7C7A1B78,
0x7CB92B78
};
#endif
// keep track of how many times we think we patched the code
static u32 fwrite_count = 0;
/* these are the syscalls we want to hook, either for debug spew or to actually change behavior */
// FIXME -- can these change between IOS versions?
#define SYSCALL_NEW_THREAD 0x0
#define SYSCALL_OPEN 0x1c
#define SYSCALL_PPCBOOT 0x41
#define SYSCALL_ARMBOOT 0x42
#define SYSCALL_LOADELF 0x5a
#ifdef DEBUG
#define dprintf printf
#else
void dprintf(char *fmt, ...) {}
#endif
/* these are defined in start.s */
extern void dc_flush(void);
extern s32 irq_kill(void);
extern void disable_icache_dcache_mmu(void);
extern void jump_to_r0(u32 *target);
extern void debug_output(u8 byte);
void do_kd_patch(u8 *buffer, u32 size);
void * find_stuff_EXI_stub(void);
u32 * find_ppcreset(void);
void find_powerpc_reset(void);
void replace_ios_loader(u32 *buffer);
extern u32 __got_start, __got_end, _start, __bss_end;
// we don't actually use this struct, but we probably should :(
typedef struct {
u32 hdrsize;
u32 loadersize;
u32 elfsize;
u32 argument;
} ioshdr;
/* these are the function pointers we will use to hook IOS syscalls -
they will point at the real (old) IOS syscall handlers. Make a new type
for each syscall you hook */
typedef u32(*new_thread_func)(u32 (*proc)(void* arg), u8 priority, u32* stack, u32 stacksize, void* arg, u8 autostart);
new_thread_func new_thread = NULL;
typedef s32(*device_open_func)(char *, s32);
device_open_func device_open = NULL;
typedef s32(*ppcboot_func)(char *);
ppcboot_func ppcboot = NULL;
typedef s32(*loadelf_func)(char *);
loadelf_func loadelf = NULL;
typedef s32(*armboot_func)(char *, u32, u32);
armboot_func armboot = NULL;
typedef void(*reload_ios_func)(u32 *, u32);
reload_ios_func reload_ios = NULL;
typedef void(*stuff_EXI_stub_func)(u32, u32 *, u32);
stuff_EXI_stub_func stuff_EXI_stub = NULL;
typedef void(*powerpc_reset_func)(void);
powerpc_reset_func powerpc_reset = NULL;
/* wrapper functions for hooked syscalls */
u32 new_thread_wrapper(u32 (*proc)(void* arg), u8 priority, u32* stack, u32 stacksize, void* arg, u8 autostart) {
s32 retval;
char buf[128];
/* gross hack -- on later modular IOSes, we can't patch KD when it's loaded
because only the kernel gets loaded by our ELF loader/patcher -- so instead,
we wait until the module is actually started to do our patch */
if ((((u32)proc) >> 16) == 0x13db) do_kd_patch((u8 *)0x13db0000, 0x57000);
retval = new_thread(proc, priority, stack, stacksize, arg, autostart);
printf("new_thread(%x,%d,%x,%x,%x,%x)=%d\n", (u32)proc, priority, (u32)stack, stacksize, (u32)arg, autostart, retval);
return retval;
}
s32 device_open_wrapper(char *filename, s32 mode) {
s32 retval;
char buf[128];
/* This is really just for debug spew */
retval = device_open(filename, mode);
printf("open(%s,%d)=%d\n", filename, mode, retval);
return retval;
}
/* it would be nice to figure out how to do patching of the loaded PPC content here */
s32 ppcboot_wrapper(char *filename) {
s32 retval;
printf("ppcboot(%s)\n",filename);
retval = ppcboot(filename);
printf("ppcboot returned %d fwrite_count=%d\n", retval,fwrite_count);
return retval;
}
/* This is called by modular IOS's kernel to load each module from NAND -- could probably
do patching here instead of in new_thread, but you have to figure out whether or not
this is the right module to patch somehow */
s32 loadelf_wrapper(char *filename) {
s32 retval;
printf("loadelf(%s)\n", filename);
retval = loadelf(filename);
printf("loadelf returned %d\n", retval);
return retval;
}
// mostly just for logging at this point, but maybe would be better to do patches here?
s32 armboot_wrapper(char *filename, u32 r1, u32 filesize) {
s32 retval;
printf("armboot(%s, %x, %x)\n", filename, r1, filesize);
retval = armboot(filename, r1, filesize);
printf("armboot returned %d\n", retval);
return retval;
}
/* here is where the magic happens -- note that this is really just reimplementing most of reload_ios
from IOS, because there was no easy way to just hook it */
/* option 1 */
/* here is where the magic happens -- note that this is really just reimplementing most of reload_ios
from IOS, because there was no easy way to just hook it. This option is better than option 2,
because we don't need to hardcode the value of buffer; IIRC, this code is not present on early versions of IOS. */
#ifdef USE_RELOAD_IOS
void reload_ios_wrapper(u32 *buffer, u32 version) {
printf("reload_ios(%x, %x)\n",(u32)buffer, version);
irq_kill();
set32(HW_ARMIRQMASK, 0);
replace_ios_loader(buffer);
printf("Here goes nothing...\n");
/* magic pokes from reload_ios() */
dc_flush();
disable_icache_dcache_mmu();
write32(0x3118, 0x04000000);
write32(0x311C, 0x04000000);
write32(0x3120, 0x93400000);
write32(0x3124, 0x90000800);
write32(0x3128, 0x933E0000);
write32(0x3130, 0x933E0000);
write32(0x3134, 0x93400000);
write32(0x3140, version);
write32(0x3148, 0x93400000);
write32(0x314C, 0x93420000);
write32(0x0d010018, 1);
jump_to_r0(buffer);
printf("wtf am I here\n"); // should not be reached
panic(0x14);
}
#else // !USE_RELOAD_IOS
/* option 2 */
/* we really need to figure out how to find the buffer we need at runtime if we intend on using this */
u32 xchange_osvers_and_patch(u32 version) {
u32 *buffer = (u32 *)0x10100000; // safe to hardcode? NO --
printf("xchange_osvers_and_patch(%x)\n", version);
u32 oldvers = read32(0x3140);
if (version && version != oldvers) {
printf("! Set OS version to %u !\n", version);
write32(0x3140, version);
// dc_flush();
}
replace_ios_loader(buffer);
printf("! Returning old OS version %x !\n", oldvers);
// jump_to_r0(buffer); // I don't remember why I tried this, but this would immediately execute the new IOS
return oldvers;
}
#endif
void replace_ios_loader(u32 *buffer) {
printf("new hdr length = %x\n",buffer[0]);
printf("new ELF offset = %x\n",buffer[1]);
printf("new ELF length = %x\n",buffer[2]);
printf("new param = %x\n", buffer[3]);
u32 *me = (u32 *)MEMHOLE_ADDR;
printf("our hdr length = %x\n",me[0]);
printf("our ELF offset = %x\n",me[1]);
printf("our ELF length = %x\n",me[2]);
printf("our param = %x\n", me[3]);
/* problem: when IOS is loaded from NAND, it's 3 parts: IOS header, ELF loader, ELF
we want to overwrite the ELF loader with our own code, but it's probably bigger
than the existing IOS ELF loader
solution: move the ELF file over in memory and modify the IOS header to give ourselves enough
space to copy in babelfish as the new ELF loader */
// buffer[1] = ELF loader size -- we use this to detect if we already patched ourselves into this or whatever
if (buffer[1] > me[1]) { // should never happen, but can happen with e.g. MINI
printf("wtf, their loader is bigger than ours :(\n");
panic(0x40);
}
if (buffer[1] == me[1]) {
printf("already using our loader, nothing to hax\n");
} else { // buffer[1] < me[1]
u32 *old_elf_start = buffer + (buffer[1] + buffer[0])/4;
u32 *new_elf_start = buffer + (me[1] + me[0])/4;
printf("moving %x bytes from %x to %x\n", buffer[2], (u32)old_elf_start, (u32)new_elf_start);
u32 i;
// copy in backwards order because these buffers overlap
memcpyr(new_elf_start, old_elf_start, buffer[2]);
printf("move complete\n");
printf("copying in loader from %x to %x\n",(u32)&me[4],(u32)&buffer[4]);
memcpyr(&buffer[4], &me[4], me[1]);
printf("done\n");
// copy over ELF offset and size
buffer[1] = me[1];
buffer[2] = me[2];
printf("pwnt\n");
}
}
#ifdef PPCHAX
/* This code is a mess because I was flailing around trying to get PPC patching
to work, sorry ... this code *doesn't* work. */
void stuff_EXI_stub_wrapper(u32 which_stub, u32 *insns, u32 len) {
printf("stuff_EXI_stub(%x, %x, %x)\n", which_stub, (u32) insns, len);
printf("Looking for fwrite\n");
u32 addr;
u32 *mem1 = (u32 *)0x1330000;
printf("81330000: %08x %08x %08x %08x\n", mem1[0], mem1[1], mem1[2], mem1[3]);
for (addr = 0; addr < 0x1800000; addr += 4) {
if (!memcmp((void *)addr, sig_fwrite, sizeof sig_fwrite)) {
printf("found fwrite at %x, patching\n", addr);
u32 *ptr = (u32 *)addr;
int i;
for (i = 0; i < 16; i+=4)
printf("%08x: %08x %08x %08x %08x\n",
((u32)addr) + i*4, ptr[i], ptr[i+1], ptr[i+2], ptr[i+3]);
// memcpyr((void *)addr, fwrite_patch, sizeof fwrite_patch);
// break;
}
}
stuff_EXI_stub(which_stub, insns, len);
printf("stuff_EXI_stub done\n");
}
void powerpc_reset_wrapper(void) {
// printf("powerpc_reset()\n");
// printf("Looking for fwrite\n");
u32 addr;
u32 *mem1 = (u32 *)0x1330000;
// printf("81330000: %08x %08x %08x %08x\n", mem1[0], mem1[1], mem1[2], mem1[3]);
// powerpc_reset();
for (addr = 0; addr < 0x1800000; addr += 4) {
if (!memcmp((void *)addr, sig_fwrite, sizeof sig_fwrite)) {
fwrite_count++;
// printf("found fwrite at %x, patching\n", addr);
u32 *ptr = (u32 *)addr;
int i;
// for (i = 0; i < 16; i+=4)
// printf("%08x: %08x %08x %08x %08x\n",
// ((u32)addr) + i*4, ptr[i], ptr[i+1], ptr[i+2], ptr[i+3]);
// memcpyr((void *)addr, fwrite_patch, sizeof fwrite_patch);
for (i=0; i < sizeof(fwrite_patch)/4; i++) ptr[i] = fwrite_patch[i];
break;
}
}
// dc_flushall();
u32* hw_ppcirqmask = (u32*)0x0D800034;
u32* hw_reset = (u32*)0x0D800194;
u32* hw_timer = (u32*)0x0D800010;
u32 time_next;
*hw_ppcirqmask = 0x40000000;
*hw_reset &= ~0x30;
// sleep. this isn't exactly right...
for (time_next = *hw_timer+0xF; time_next < *hw_timer;);
*hw_reset |= 0x20;
// sleep
for (time_next = *hw_timer+0x96; time_next < *hw_timer;);
*hw_reset |= 0x10;
// printf("powerpc_reset done\n");
}
#endif
#ifdef USE_RELOAD_IOS
/* look for the reload_ios function in a newly-loaded IOS kernel */
u32 * find_reload_ios(void) {
// these numbers are pretty much guaranteed to exist -- see above implementation of reload_ios
u32 magic[] = {0x93400000, 0x93420000};
u32 *kernel = (u32 *)0xFFFF0000;
int i;
printf("Looking for reload_ios\n");
for(i = 0; i < 0x10000 / 4; i++) {
if (kernel[i] == magic[0] && kernel[i+1] == magic[1]) {
printf("Found reload_ios marker at %x\n", 0xFFFF0000 + i * 4);
for (; i >=0; i--) {
if ((kernel[i] >> 16) == 0xB570) {
printf("Found function prolog at %x\n", 0xFFFF0000 + i * 4);
return (u32 *)(&kernel[i]);
}
}
printf("sry, i haz fail\n"); // could not find reload_ios, so we're screwed
return NULL;
}
}
}
#else // !USE_RELOAD_IOS
/* look for the xchange_os_version function in a newly-loaded IOS kernel */
// kernel:FFFF5A24 B5 30 PUSH {R4,R5,LR}
// kernel:FFFF5A26 23 C4 01 9B MOVS R3, 0x3100
// kernel:FFFF5A2A 6C 1D LDR R5, [R3,#0x40]
u32 * find_xchange_osvers(void) {
u32 magic[] = {0xB53023C4};
u32 *kernel = (u32 *)0xFFFF0000;
int i;
printf("Looking for xchange_osvers\n");
for(i = 0; i < 0x10000 / 4; i++) {
if (kernel[i] == magic[0]) {
printf("Found xchange_osvers start at %x\n",0xFFFF0000 + i * 4);
return (u32 *)(0xFFFF0000 + i*4);
}
}
printf("sry, I haz fail! :(\n");
return NULL;
}
#endif
// this is where we patch teh kernel to add our hooks
void do_kernel_patches(u32 size) {
printf("do_kernel_patches(%x)\n",size);
// this is just to make life easier
u32 *kernel_mem32 = (u32 *)0xFFFF0000;
u16 *kernel_mem16 = (u16 *)0xFFFF0000;
// sanity check of the syscall vector table
if (kernel_mem32[1] != 0xe59ff018) {
printf("ohnoes, unexpected offset to starlet_syscall_handler %x\n",kernel_mem32[1]);
return;
}
if (kernel_mem32[2] != 0xe59ff018) {
printf("ohnoes, unexpected offset to arm_syscall_handler %x\n",kernel_mem32[2]);
return;
}
printf("starlet_syscall_handler vector: %x\n",kernel_mem32[9]);
printf("svc_handler vector2: %x\n",kernel_mem32[10]);
/* SVC patch to get debug output over USBGecko -- we copy the code from vectors.s over some unused
code present in all IOSes to make life easier -- SVC 4 is the only one used, but they include
functions to call over SVC handlers which we can just blow away. thanks ninty */
/* scan from 0xFFFF0000 ... 0xFFFFFFFF looking for SVC 05 instruction */
u32 i;
for (i=0; i < 0x10000/2; i++) {
if (kernel_mem16[i+0] == 0x4672 &&
kernel_mem16[i+1] == 0x1c01 &&
kernel_mem16[i+2] == 0x2005) {
dprintf("SVC 5 caller found at %0x\n",0xffff0000 + i*2);
// copy in SVC vector code
memcpyr(&kernel_mem16[i], vectors_bin, vectors_bin_size);
// change SVC vector pointer to point to this new code
kernel_mem32[10] = (u32) &kernel_mem16[i];
dprintf("patch done\n");
}
// while we're here, look for the mem2 protection code and disable it
if (kernel_mem16[i+0] == 0xB500 &&
kernel_mem16[i+1] == 0x4B09 &&
kernel_mem16[i+2] == 0x2201 &&
kernel_mem16[i+3] == 0x801A &&
kernel_mem16[i+4] == 0x22F0) {
dprintf("Found MEM2 patch at %x\n",0xffff0000);
kernel_mem16[i+2] = 0x2200;
}
}
#ifdef USE_RELOAD_IOS
/* patch reload_ios so that we can infect any IOS we reload */
u32 *addr = find_reload_ios();
if (addr) { // overwrite reload_ios with a jump to our wrapper
addr[0] = 0x4B004718; // ldr r3, $+4 / bx r3
addr[1] = (u32)reload_ios_wrapper;
}
#else // !USE_RELOAD_IOS
/* patch xchange_osvers so that we can infect any IOS we reload */
u32 *addr = find_xchange_osvers();
if (addr) { // overwrite xchange_osvers with a jump to our wrapper
addr[0] = 0x4B004718; // ldr r3, $+4 / bx r3
addr[1] = (u32)xchange_osvers_and_patch;
// dprintf("wrote %08x %08x to %08x\n", addr[0], addr[1], (u32)addr);
}
#endif
#ifdef PPCHAX
find_powerpc_reset();
addr = find_ppcreset();
printf("ppcreset = %x\n", (u32)addr);
if (addr) { // overwrite ppcreboot with a jump to our wrapper
addr[0] = 0x4B004718;
addr[1] = (u32)powerpc_reset_wrapper;
}
#endif
dprintf("\ndo_kernel_patches done\n");
}
/* perform patching of syscall table to install our hooks */
void handle_syscall_table(u32 *syscall_table, u32 size) {
u32 i, num_syscalls;
for (i = 0; i < size/4; i++) if ((syscall_table[i] >> 16) == 0) break;
num_syscalls = i;
printf("Syscall table @ 0x%x: %x entries\n",(u32) syscall_table, num_syscalls);
/* We assume a specifc syscall ordering here, oops. grab the existing function pointers */
device_open = (void *)syscall_table[SYSCALL_OPEN];
new_thread = (void *)syscall_table[SYSCALL_NEW_THREAD];
ppcboot = (void *)syscall_table[SYSCALL_PPCBOOT];
armboot = (void *)syscall_table[SYSCALL_ARMBOOT];
loadelf = (void *)syscall_table[SYSCALL_LOADELF];
/* modify the table to point to our wrapper functions */
syscall_table[SYSCALL_OPEN] = (u32)device_open_wrapper;
syscall_table[SYSCALL_NEW_THREAD] = (u32)new_thread_wrapper;
syscall_table[SYSCALL_PPCBOOT] = (u32)ppcboot_wrapper;
syscall_table[SYSCALL_ARMBOOT] = (u32)armboot_wrapper;
syscall_table[SYSCALL_LOADELF] = (u32)loadelf_wrapper;
printf("\nnew device_open: %x\n", syscall_table[SYSCALL_OPEN]); // this is just to give me the warm fuzzies
printf("\nNew syscall table:\n");
for(i=0; i < num_syscalls; i++) {
printf("%x: %x\n", i, syscall_table[i]);
}
}
#ifdef PPCHAX
void * find_stuff_EXI_stub(void) {
u32 magic[] = {0x7C631A78, 0x6463D7B0};
u32 *kernel = (u32 *)0xFFFF0000;
u32 ppc_stub1_addr = 0, stuff_EXI_stub_addr = 0;
int i;
printf("Looking for ppc_stub1\n\n");
for(i = 0; i < 0x10000 / 4; i++) {
if (kernel[i] == magic[0] && kernel[i+1] == magic[1]) {
printf("Found ppc_stub1 at %x\n",0xFFFF0000 + i * 4);
break;
}
}
if (i == 0x10000/4) {
printf("Couldn't find ppc_stub1\n");
return NULL;
}
ppc_stub1_addr = 0xFFFF0000 + i*4;
for(i = 0; i < 0x10000 / 4; i++) {
if (kernel[i] == ppc_stub1_addr) {
printf("Found ppc_stub1 reference at %x\n",0xFFFF0000 + i * 4);
break;
}
}
if (i == 0x10000/4) {
printf("Couldn't find ppc_stub ref\n");
return NULL;
}
for(; i > 0; i--) {
if (kernel[i] == 0xB5001C03) {
printf("Found stuff_EXI_stub start at %x\n", 0xFFFF0000 + i * 4);
break;
}
}
if (i == 0x10000) {
printf("Couldn't find stuff_EXI_stub start\n");
return NULL;
}
stuff_EXI_stub = (void *)(0xFFFF0000 + i * 4 + 1); // thumb offset
for(i = 0; i < 0x10000 / 4; i++) {
if (kernel[i] == (u32)stuff_EXI_stub) {
printf("Found stuff_EXI_stub_addr reference at %x\n", 0xFFFF0000 + i * 4);
break;
}
}
if (i == 0x10000) {
printf("Couldn't find stuff_EXI_stub reference\n");
return NULL;
}
kernel[i] = (u32)&stuff_EXI_stub_wrapper;
printf("Replaced stuff_EXI_stub reference with %x\n", kernel[i]);
return NULL;
}
void find_powerpc_reset(void) {
u32 magic[] = {0x0d800034, 0x0d800194};
u32 *kernel = (u32 *)0xFFFF0000;
u32 ppc_stub1_addr = 0, stuff_EXI_stub_addr = 0;
int i;
printf("Looking for powerpc_reset magic\n\n");
for(i = 0; i < 0x10000 / 4; i++) {
if (kernel[i] == magic[0] && kernel[i+1] == magic[1]) {
printf("Found powerpc_reset magic at %x\n",0xFFFF0000 + i * 4);
break;
}
}
if (i == 0x10000/4) {
printf("Couldn't find powerpc_reset magic\n");
return;
}
for(; i > 0; i--) {
if (kernel[i] == 0xB5704646) {
printf("Found powerpc_reset start at %x\n", 0xFFFF0000 + i * 4);
break;
}
}
if (i == 0x10000) {
printf("Couldn't find powerpc_reset start\n");
return;
}
powerpc_reset = (void *)(0xFFFF0000 + i*4 + 1);
for(i = 0; i < 0x10000 / 4; i++) {
if (kernel[i] == (u32)powerpc_reset) {
printf("Found powerpc_reset reference at %x\n", 0xFFFF0000 + i * 4);
break;
}
}
if (i == 0x10000) {
printf("Couldn't find powerpc_reset reference\n");
return;
}
// kernel[i] = (u32)&powerpc_reset_wrapper;
printf("Replaced powerpc_reset reference with %x\n", kernel[i]);
}
u32 * find_ppcreset(void) {
u32 magic[] = {0x0d800034, 0x0d800194};
u32 *kernel = (u32*)0xFFFF0000;
int i;
for(i=0; i < 0x10000 / 4; i++) {
if (kernel[i] == magic[0] && kernel[i+1] == magic[1]) {
for (; i >=0; i--) {
if ((kernel[i] >> 16) == 0xB570) // push {R4-R6,LR}, prolog
return kernel+i;
}
return NULL;
}
}
return NULL;
}
#endif
/* this gross patch is necessary to get WC24 debug spew */
void do_kd_patch(u8 *buffer, u32 size) {
int i;
// I don't remember what this first patch was, sorry
// u8 match[] = {0x13, 0xdf, 0x5f, 0xcd, 0x13, 0xdf, 0x5f, 0xa9};
// u8 replace[] = {0x13, 0xdf, 0x5f, 0x45, 0x13, 0xdf, 0x5f, 0x29};
u8 match[] = {0x30, 0x01, 0x28, 0x7f, 0xd9, 0x01, 0x23, 0x00};
u8 replace[] = {0x49, 0x16, 0x20, 0x04, 0xdf, 0xab, 0x23, 0x00};
dprintf("Looking for can_haz_debug(%x, %x)\n",(u32)buffer, size);
for(i=0; i < (size-16); i++) {
if (!memcmp(match, buffer+i, 8)) {
dprintf("Found match @ %x\n",(u32)&buffer[i]);
memcpyr(buffer + i, replace, 8);
return;
}
}
}
/* ye olde ELF loader, written in C for great justice
also patches too */
void *_loadelf(const u8 *elf) {
if(memcmp("\x7F" "ELF\x01\x02\x01",elf,7)) {
panic(0xE3);
}
printf("ELF magic ok\n");
Elf32_Ehdr *ehdr = (Elf32_Ehdr*)elf;
if(ehdr->e_phoff == 0) {
panic(0xE4);
}
dprintf("e_phoff=%x\n",ehdr->e_phoff);
int count = ehdr->e_phnum;
Elf32_Phdr *phdr = (Elf32_Phdr*)(elf + ehdr->e_phoff);
while(count--)
{
dprintf("count=%x phdr type=%x paddr=%x offset=%x filesz=%x\n",
count, (u32)phdr->p_type, (u32)phdr->p_paddr, phdr->p_offset, (u32)phdr->p_filesz);
if(phdr->p_type == PT_LOAD && phdr->p_filesz != 0) {
const void *src = elf + phdr->p_offset;
memcpyr(phdr->p_paddr, src, phdr->p_filesz); // could be memcpy, but trying to save code space
if (phdr->p_paddr == (u32 *)0xFFFF0000) do_kernel_patches(phdr->p_filesz);
if (count == 1) handle_syscall_table(phdr->p_paddr, phdr->p_filesz); // assumes syscall table will always be last phdr
// this patch needs to be done when the kernel loads the module, not when loading the kernel
do_kd_patch(phdr->p_paddr, phdr->p_filesz);
}
phdr++;
}
dprintf("done, entrypt = %x\n", (u32)ehdr->e_entry);
#ifdef PPCHAX
find_stuff_EXI_stub();
#endif
return ehdr->e_entry;
}
static inline void disable_boot0(void)
{
set32(HW_BOOT0, 0x1000);
}
static inline void mem_setswap(void)
{
set32(HW_MEMMIRR, 0x20);
}
void *_main(void *base)
{
ioshdr *hdr = (ioshdr*)base;
u8 *elf;
void *entry;
elf = (u8*) base;
elf += hdr->hdrsize + hdr->loadersize;
debug_output(0xF1);
mem_setswap();
disable_boot0();
gecko_init();
printf("elfloader elf=%x\n",(u32)elf);
entry = _loadelf(elf);
printf("loadelf done\n");
debug_output(0xC1);
return entry;
}

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/*
babelfish - self-propagating Just-In-Time IOS patcher
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
Copyright (C) 2008-2011 Haxx Enterprises <bushing@gmail.com>
This code is licensed to you under the terms of the GNU GPL, version 2;
see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
This code lives at http://gitweb.bootmii.org/?p=babelfish.git
*/
OUTPUT_FORMAT("elf32-bigarm")
OUTPUT_ARCH(arm)
EXTERN(_start)
ENTRY(_start)
__base_addr = 0;
/* this must match the value in babelfish.c and start.S, we shouldn't need to hardcode this? */
__hiding_spot = 0x13A80000;
SECTIONS
{
. = __base_addr;
.header : /* build the 0x10-byte "IOS header" */
{
__header = .;
/* Entry point (offset) */
LONG(__code_start);
/* Loader size */
LONG(__loader_size);
/* ELF size */
LONG(0);
/* Boot argument? */
LONG(0);
. = ALIGN(16);
}
__code_start = .;
.init :
{
*(.init)
. = ALIGN(4);
}
.got :
{
__got_start = .;
LONG(0);
*(.got.*)
*(.got)
. = ALIGN(4);
__got_end = . ;
}
.text :
{
*(.text.*)
*(.gnu.warning)
*(.gnu.linkonce.t*)
*(.glue_7)
*(.glue_7t)
. = ALIGN(4);
}
__text_end = . ;
.rodata :
{
*(.rodata)
*all.rodata*(*)
*(.roda)
*(.rodata.*)
*(.gnu.linkonce.r*)
. = ALIGN(4);
}
.data :
{
*(.data)
*(.data.*)
*(.gnu.linkonce.d*)
. = ALIGN(4);
}
.bss :
{
__bss_start = . ;
*(.dynbss)
*(.gnu.linkonce.b*)
*(.bss*)
*(.sbss*)
*(COMMON)
. = ALIGN(32);
__bss_end = . ;
}
}
/* make sure you leave enough room for the stack -- I had major problems
with printf until I realized I was exhausting my stack. Changed this
from 0x100 to 0x800 bytes */
__stack_end = (__bss_end);
__stack_addr = (__bss_end + 0x800);
__end = __stack_addr ;
__loader_size = __end - __code_start;
PROVIDE (__stack_end = __stack_end);
PROVIDE (__stack_addr = __stack_addr);
PROVIDE (__got_start = __got_start);
PROVIDE (__got_end = __got_end);
PROVIDE (__bss_start = __bss_start);
PROVIDE (__bss_end = __bss_end);
PROVIDE (__hiding_spot = __hiding_spot);

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AR = $(PREFIX)ar
AS = $(PREFIX)as
CC = $(PREFIX)gcc
CXX = $(PREFIX)g++
LD = $(PREFIX)ld
OBJCOPY = $(PREFIX)objcopy
RANLIB = $(PREFIX)ranlib
STRIP = $(PREFIX)strip
BIN2S = $(DEVKITPPC)/bin/bin2s
ifeq ($(NOMAPFILE),)
LDFLAGS += -Wl,-Map,$(TARGET).map
endif
ifneq ($(LDSCRIPT),)
LDFLAGS += -Wl,-T$(LDSCRIPT)
endif
DEPDIR = .deps
all: $(TARGET)
$(TARGET): $(OBJS)
@echo " LINK $@"
@$(CC) $(LDFLAGS) $(OBJS) $(LIBS) -o $@
ifneq ($(LDSCRIPT),)
$(TARGET): $(LDSCRIPT)
endif
%.o: %.c
@echo " COMPILE $<"
@mkdir -p $(DEPDIR)
@$(CC) $(CFLAGS) $(DEFINES) -Wp,-MMD,$(DEPDIR)/$(*F).d,-MQ,"$@",-MP -c $< -o $@
%.o: %.s
@echo " ASSEMBLE $<"
@$(CC) $(CFLAGS) $(DEFINES) $(ASFLAGS) -c $< -o $@
%.o: %.S
@echo " ASSEMBLE $<"
@$(CC) $(CFLAGS) $(DEFINES) $(ASFLAGS) -c $< -o $@
clean:
rm -rf $(DEPDIR)
rm -f $(TARGET) $(TARGET).map $(OBJS)
define bin2o
@echo " BIN2S $(notdir $<)"
@$(BIN2S) -a 32 $< | $(AS) -o $(@)
@echo "extern const u8" `(echo $(<F) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"_end[];" > `(echo $(<F) | tr . _)`.h
@echo "extern const u8" `(echo $(<F) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"[];" >> `(echo $(<F) | tr . _)`.h
@echo "extern const u32" `(echo $(<F) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`_size";" >> `(echo $(<F) | tr . _)`.h
endef
-include $(DEPDIR)/*
.PHONY: clean

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/*
mini - a Free Software replacement for the Nintendo/BroadOn IOS.
ELF loader: ELF structures
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
This code is licensed to you under the terms of the GNU GPL, version 2;
see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
This code lives at http://gitweb.bootmii.org/?p=babelfish.git
*/
#ifndef __ELF_H__
#define __ELF_H__
#include "types.h"
#define EI_NIDENT 16
typedef struct {
unsigned char e_ident[EI_NIDENT];
u16 e_type;
u16 e_machine;
u32 e_version;
void *e_entry;
u32 e_phoff;
u32 e_shoff;
u32 e_flags;
u16 e_ehsize;
u16 e_phentsize;
u16 e_phnum;
u16 e_shentsize;
u16 e_shnum;
u16 e_shtrndx;
} Elf32_Ehdr;
typedef struct {
u32 p_type;
u32 p_offset;
void *p_vaddr;
void *p_paddr;
u32 p_filesz;
u32 p_memsz;
u32 p_flags;
u32 p_align;
} Elf32_Phdr;
#define PT_NULL 0
#define PT_LOAD 1
#define PT_DYNAMIC 2
#define PT_INTERP 3
#define PT_NOTE 4
#define PT_SHLIB 5
#define PT_PHDR 6
#endif

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/*
babelfish - self-propagating Just-In-Time IOS patcher
Copyright (C) 2008-2011 Haxx Enterprises <bushing@gmail.com>
This code is licensed to you under the terms of the GNU GPL, version 2;
see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
This code lives at http://gitweb.bootmii.org/?p=babelfish.git
*/
#include "types.h"
#include "utils.h"
#include "hollywood.h"
#include "gecko.h"
/* some of this code is redundant with that in vectors.s */
static int gecko_active = 0;
static u32 _gecko_command(u32 command)
{
u32 i;
// Memory Card Port B (Channel 1, Device 0, Frequency 3 (32Mhz Clock))
write32(EXI1_CSR, 0xd0);
write32(EXI1_DATA, command);
write32(EXI1_CR, 0x19);
while (read32(EXI1_CR) & 1);
i = read32(EXI1_DATA);
write32(EXI1_CSR, 0);
return i;
}
static u32 _gecko_sendbyte(char sendbyte)
{
u32 i = 0;
i = _gecko_command(0xB0000000 | (sendbyte<<20));
if (i&0x04000000)
return 1; // Return 1 if byte was sent
return 0;
}
static u32 _gecko_checksend(void)
{
u32 i = 0;
i = _gecko_command(0xC0000000);
if (i&0x04000000)
return 1; // Return 1 if safe to send
return 0;
}
int gecko_isalive(void)
{
u32 i;
i = _gecko_command(0x90000000);
if ((i&0xFFFF0000) != 0x04700000)
return 0;
return 1;
}
void gecko_init(void)
{
write32(EXI0_CSR, 0);
write32(EXI1_CSR, 0);
write32(EXI2_CSR, 0);
write32(EXI0_CSR, 0x2000);
write32(EXI0_CSR, 3<<10);
write32(EXI1_CSR, 3<<10);
gecko_active = 0;
if(gecko_isalive())
gecko_active = 1;
}
int gecko_putc(int c) {
if (!gecko_active) return -1;
int tries = 10000; // about 200ms of tries; if we fail, fail gracefully instead of just hanging
// this makes CCC demos less embarassing
if((read32(HW_EXICTRL) & EXICTRL_ENABLE_EXI) == 0)
return 0;
if(_gecko_checksend()) {
if(!_gecko_sendbyte(c))
return 0;
} else {
// if gecko is hung, time out and disable further attempts
// only affects gecko users without an active terminal
if(tries-- == 0) {
gecko_active = 0;
return 0;
}
}
return 1;
}
int gecko_puts(const char *s) {
int bytes_written = 0;
while(*s) {
if (!gecko_putc(*s++)) break;
bytes_written++;
}
return bytes_written;
}

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/*
babelfish - self-propagating Just-In-Time IOS patcher
Copyright (C) 2008-2011 Haxx Enterprises <bushing@gmail.com>
This code is licensed to you under the terms of the GNU GPL, version 2;
see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
This code lives at http://gitweb.bootmii.org/?p=babelfish.git
*/
#ifndef __GECKO_H__
#define __GECKO_H__
#include "types.h"
int gecko_isalive(void);
int gecko_putc(int c);
int gecko_puts(const char *s);
void gecko_init(void);
#endif

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/*
babelfish - self-propagating Just-In-Time IOS patcher
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
Copyright (C) 2008-2011 Haxx Enterprises <bushing@gmail.com>
This code is licensed to you under the terms of the GNU GPL, version 2;
see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
This code lives at http://gitweb.bootmii.org/?p=babelfish.git
*/
#ifndef __HOLLYWOOD_H__
#define __HOLLYWOOD_H__
#define HW_REG_BASE 0xd800000
#define HW_TIMER (HW_REG_BASE + 0x010)
#define HW_ARMIRQMASK (HW_REG_BASE + 0x03c)
#define HW_MEMMIRR (HW_REG_BASE + 0x060)
#define HW_BOOT0 (HW_REG_BASE + 0x18c)
#define HW_EXICTRL (HW_REG_BASE + 0x070)
#define EXICTRL_ENABLE_EXI 1
#define HW_VERSION (HW_REG_BASE + 0x214)
#define MEM_REG_BASE 0xd8b4000
#define MEM_FLUSHREQ (MEM_REG_BASE + 0x228)
#define MEM_FLUSHACK (MEM_REG_BASE + 0x22a)
#define EXI_REG_BASE 0xd806800
#define EXI0_REG_BASE (EXI_REG_BASE + 0x000)
#define EXI2_REG_BASE (EXI_REG_BASE + 0x028)
#define EXI0_CSR (EXI0_REG_BASE + 0x000)
#define EXI2_CSR (EXI2_REG_BASE + 0x000)
#define EXI1_REG_BASE (EXI_REG_BASE + 0x014)
#define EXI1_CSR (EXI1_REG_BASE + 0x000)
#define EXI1_MAR (EXI1_REG_BASE + 0x004)
#define EXI1_LENGTH (EXI1_REG_BASE + 0x008)
#define EXI1_CR (EXI1_REG_BASE + 0x00c)
#define EXI1_DATA (EXI1_REG_BASE + 0x010)
#endif

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/*
babelfish - self-propagating Just-In-Time IOS patcher
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
Copyright (C) 2008-2011 Haxx Enterprises
This code is licensed to you under the terms of the GNU GPL, version 2;
see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
This code lives at http://gitweb.bootmii.org/?p=babelfish.git
*/
#include "types.h"
#include "memory.h"
#include "utils.h"
#include "gecko.h"
#include "hollywood.h"
void _dc_inval_entries(void *start, int count);
void _dc_flush_entries(const void *start, int count);
void _dc_flush(void);
void _ic_inval(void);
void _drain_write_buffer(void);
#define LINESIZE 0x20
#define CACHESIZE 0x4000
#define CR_MMU (1 << 0)
#define CR_DCACHE (1 << 2)
#define CR_ICACHE (1 << 12)
// TODO: move to hollywood.h once we figure out WTF
#define HW_100 (HW_REG_BASE + 0x100)
#define HW_104 (HW_REG_BASE + 0x104)
#define HW_108 (HW_REG_BASE + 0x108)
#define HW_10c (HW_REG_BASE + 0x10c)
#define HW_110 (HW_REG_BASE + 0x110)
#define HW_114 (HW_REG_BASE + 0x114)
#define HW_118 (HW_REG_BASE + 0x118)
#define HW_11c (HW_REG_BASE + 0x11c)
#define HW_120 (HW_REG_BASE + 0x120)
#define HW_124 (HW_REG_BASE + 0x124)
#define HW_130 (HW_REG_BASE + 0x130)
#define HW_134 (HW_REG_BASE + 0x134)
#define HW_138 (HW_REG_BASE + 0x138)
#define HW_188 (HW_REG_BASE + 0x188)
#define HW_18C (HW_REG_BASE + 0x18c)
// what is this thing doing anyway?
// and why only on reads?
u32 _mc_read32(u32 addr)
{
u32 data;
u32 tmp130 = 0;
// this seems to be a bug workaround
if(!(read32(HW_VERSION) & 0xF0))
{
tmp130 = read32(HW_130);
write32(HW_130, tmp130 | 0x400);
// Dummy reads?
read32(HW_138);
read32(HW_138);
read32(HW_138);
read32(HW_138);
}
data = read32(addr);
read32(HW_VERSION); //???
if(!(read32(HW_VERSION) & 0xF0))
write32(HW_130, tmp130);
return data;
}
// this is ripped from IOS, because no one can figure out just WTF this thing is doing
void _ahb_flush_to(enum AHBDEV dev) {
u32 mask = 10;
switch(dev) {
case AHB_STARLET: mask = 0x8000; break;
case AHB_1: mask = 0x4000; break;
//case 2: mask = 0x0001; break;
case AHB_NAND: mask = 0x0002; break;
case AHB_AES: mask = 0x0004; break;
case AHB_SHA1: mask = 0x0008; break;
//case 6: mask = 0x0010; break;
//case 7: mask = 0x0020; break;
//case 8: mask = 0x0040; break;
case AHB_SDHC: mask = 0x0080; break;
//case 10: mask = 0x0100; break;
//case 11: mask = 0x1000; break;
//case 12: mask = 0x0000; break;
default:
// gecko_printf("ahb_invalidate(%d): Invalid device\n", dev);
return;
}
//NOTE: 0xd8b000x, not 0xd8b400x!
u32 val = _mc_read32(0xd8b0008);
if(!(val & mask)) {
switch(dev) {
// 2 to 10 in IOS, add more
case AHB_NAND:
case AHB_AES:
case AHB_SHA1:
case AHB_SDHC:
//0, 1, 11 in IOS, add more
case AHB_STARLET:
case AHB_1:
write32(0xd8b0008, val & (~mask));
// wtfux
write32(0xd8b0008, val | mask);
write32(0xd8b0008, val | mask);
write32(0xd8b0008, val | mask);
}
}
}
// invalidate device and then starlet
void ahb_flush_to(enum AHBDEV type)
{
u32 cookie = irq_kill();
_ahb_flush_to(type);
if(type != AHB_STARLET)
_ahb_flush_to(AHB_STARLET);
// irq_restore(cookie);
}
// flush device and also invalidate memory
void ahb_flush_from(enum AHBDEV dev)
{
u32 cookie = irq_kill();
u16 req = 0;
u16 ack;
int i;
switch(dev)
{
case AHB_STARLET:
case AHB_1:
req = 1;
break;
case AHB_AES:
case AHB_SHA1:
req = 2;
break;
case AHB_NAND:
case AHB_SDHC:
req = 8;
break;
default:
// gecko_printf("ahb_flush(%d): Invalid device\n", dev);
return;
}
write16(MEM_FLUSHREQ, req);
for(i=0;i<1000000;i++) {
ack = read16(MEM_FLUSHACK);
_ahb_flush_to(AHB_STARLET);
if(ack == req)
break;
}
write16(MEM_FLUSHREQ, 0);
if(i>=1000000) {
// gecko_printf("ahb_flush(%d): Flush (0x%x) did not ack!\n", dev, req);
}
// irq_restore(cookie);
}
void dc_flushrange(const void *start, u32 size)
{
u32 cookie = irq_kill();
if(size > 0x4000) {
_dc_flush();
} else {
void *end = ALIGN_FORWARD(((u8*)start) + size, LINESIZE);
start = ALIGN_BACKWARD(start, LINESIZE);
_dc_flush_entries(start, (end - start) / LINESIZE);
}
_drain_write_buffer();
ahb_flush_from(AHB_1);
// irq_restore(cookie);
}
void dc_invalidaterange(void *start, u32 size)
{
u32 cookie = irq_kill();
void *end = ALIGN_FORWARD(((u8*)start) + size, LINESIZE);
start = ALIGN_BACKWARD(start, LINESIZE);
_dc_inval_entries(start, (end - start) / LINESIZE);
ahb_flush_to(AHB_STARLET);
// irq_restore(cookie);
}
void dc_flushall(void)
{
u32 cookie = irq_kill();
_dc_flush();
_drain_write_buffer();
ahb_flush_from(AHB_1);
// irq_restore(cookie);
}
void ic_invalidateall(void)
{
u32 cookie = irq_kill();
_ic_inval();
ahb_flush_to(AHB_STARLET);
// irq_restore(cookie);
}

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/*
mini - a Free Software replacement for the Nintendo/BroadOn IOS.
memory management, MMU, caches, and flushing
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
# This code is licensed to you under the terms of the GNU GPL, version 2;
# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
*/
#ifndef __MEMORY_H__
#define __MEMORY_H__
#include "types.h"
#define ALIGN_FORWARD(x,align) \
((typeof(x))((((u32)(x)) + (align) - 1) & (~(align-1))))
#define ALIGN_BACKWARD(x,align) \
((typeof(x))(((u32)(x)) & (~(align-1))))
enum AHBDEV {
AHB_STARLET = 0, //or MEM2 or some controller or bus or ??
AHB_1 = 1, //ppc or something else???
AHB_NAND = 3,
AHB_AES = 4,
AHB_SHA1 = 5,
AHB_SDHC = 9,
};
void dc_flushrange(const void *start, u32 size);
void dc_invalidaterange(void *start, u32 size);
void dc_flushall(void);
void ic_invalidateall(void);
void ahb_flush_from(enum AHBDEV dev);
void ahb_flush_to(enum AHBDEV dev);
void mem_protect(int enable, void *start, void *end);
void mem_setswap(int enable);
void mem_initialize(void);
void mem_shutdown(void);
u32 dma_addr(void *);
static inline u32 get_cr(void)
{
u32 data;
__asm__ volatile ( "mrc\tp15, 0, %0, c1, c0, 0" : "=r" (data) );
return data;
}
static inline u32 get_ttbr(void)
{
u32 data;
__asm__ volatile ( "mrc\tp15, 0, %0, c2, c0, 0" : "=r" (data) );
return data;
}
static inline u32 get_dacr(void)
{
u32 data;
__asm__ volatile ( "mrc\tp15, 0, %0, c3, c0, 0" : "=r" (data) );
return data;
}
static inline void set_cr(u32 data)
{
__asm__ volatile ( "mcr\tp15, 0, %0, c1, c0, 0" :: "r" (data) );
}
static inline void set_ttbr(u32 data)
{
__asm__ volatile ( "mcr\tp15, 0, %0, c2, c0, 0" :: "r" (data) );
}
static inline void set_dacr(u32 data)
{
__asm__ volatile ( "mcr\tp15, 0, %0, c3, c0, 0" :: "r" (data) );
}
static inline u32 get_dfsr(void)
{
u32 data;
__asm__ volatile ( "mrc\tp15, 0, %0, c5, c0, 0" : "=r" (data) );
return data;
}
static inline u32 get_ifsr(void)
{
u32 data;
__asm__ volatile ( "mrc\tp15, 0, %0, c5, c0, 1" : "=r" (data) );
return data;
}
static inline u32 get_far(void)
{
u32 data;
__asm__ volatile ( "mrc\tp15, 0, %0, c6, c0, 0" : "=r" (data) );
return data;
}
void _ahb_flush_to(enum AHBDEV dev);
static inline void dc_inval_block_fast(void *block)
{
__asm__ volatile ( "mcr\tp15, 0, %0, c7, c6, 1" :: "r" (block) );
_ahb_flush_to(AHB_STARLET); //TODO: check if really needed and if not, remove
}
static inline void dc_flush_block_fast(void *block)
{
__asm__ volatile ( "mcr\tp15, 0, %0, c7, c10, 1" :: "r" (block) );
__asm__ volatile ( "mcr\tp15, 0, %0, c7, c10, 4" :: "r" (0) );
ahb_flush_from(AHB_1); //TODO: check if really needed and if not, remove
}
#endif

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/*
mini - a Free Software replacement for the Nintendo/BroadOn IOS.
memory management, MMU, caches, and flushing
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
# This code is licensed to you under the terms of the GNU GPL, version 2;
# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
*/
.arm
.globl _dc_inval_entries
.globl _dc_flush_entries
.globl _dc_flush
.globl _dc_inval
.globl _ic_inval
.globl _drain_write_buffer
.globl _tlb_inval
.text
_dc_inval_entries:
mcr p15, 0, r0, c7, c6, 1
add r0, #0x20
subs r1, #1
bne _dc_inval_entries
bx lr
_dc_flush_entries:
mcr p15, 0, r0, c7, c10, 1
add r0, #0x20
subs r1, #1
bne _dc_flush_entries
bx lr
_dc_flush:
mrc p15, 0, pc, c7, c10, 3
bne _dc_flush
bx lr
_dc_inval:
mov r0, #0
mcr p15, 0, r0, c7, c6, 0
bx lr
_ic_inval:
mov r0, #0
mcr p15, 0, r0, c7, c5, 0
bx lr
_drain_write_buffer:
mov r0, #0
mcr p15, 0, r0, c7, c10, 4
bx lr
_tlb_inval:
mov r0, #0
mcr p15, 0, r0, c8, c7
bx lr

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ifeq ($(strip $(WIIDEV)),)
$(error "Set WIIDEV in your environment.")
endif
PREFIX = $(WIIDEV)/bin/armeb-eabi-
CFLAGS = -mbig-endian -mcpu=arm926ej-s
CFLAGS += -fomit-frame-pointer -ffunction-sections
CFLAGS += -Wall -Wextra -Os -pipe
ASFLAGS =
LDFLAGS = -mbig-endian -n -nostartfiles -nodefaultlibs -Wl,-gc-sections

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/* babelfish - self-propagating Just-In-Time IOS patcher
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
Copyright (C) 2008-2011 Haxx Enterprises <bushing@gmail.com>
This code is licensed to you under the terms of the GNU GPL, version 2;
see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
This code lives at http://gitweb.bootmii.org/?p=babelfish.git
*/
.arm
.extern _main
.extern __got_start
.extern __got_end
.extern __bss_start
.extern __bss_end
.extern __stack_addr
.extern delay
.globl _start
.globl debug_output
.globl dc_flush
.globl irq_kill
.globl disable_icache_dcache_mmu
.globl jump_to_r0
.section .init
_start:
@ Get real address of _start
sub r4, pc, #8
@ Subtract offset to get the address that we were loaded at
ldr r0, =_start
sub r4, r4, r0
mov r7, r4
@ here's part of the magic:
@ XXX calculate size of code+data -- or just hardcode it :/
mov r5, #0x4000
@ Output 0x42 to the debug port
mov r0, #0x42
bl debug_output
@ copy ourselves to hiding spot
mov r2, r4 @ r2 = original loading address
add r5, r5, r4 @ stop copying at r5
@ ldr r4, =__hiding_spot @ set new loading address
mov r4, #0x13000000 @ ugh we really shouldn't hardcode this - hiding spot = 0x13A80000
add r4, r4, #0xA80000
mov r1, r4
@ copy ourselves to hiding spot: from r2 to r1
copy_loop:
ldr r3, [r2]
add r2, r2, #4
str r3, [r1]
add r1, r1, #4
cmp r2, r5
bne copy_loop
@ the copy_loop code plus these next two instructions are 0x60 bytes long
@ jump to our newly-relocated self -- execution will "seamlessly" resume
add r0, r4, #0x60
bx r0
@ execution is transferred here
@ the rest of this is just standard ELF loader stuff, except for the step after GOT relocation
@ Set up a stack
ldr sp, =__stack_addr
add sp, r4
@ Output 0x43 to the debug port
mov r0, #0x43
bl debug_output
@ relocate the GOT entries
ldr r1, =__got_start
add r1, r4
ldr r2, =__got_end
add r2, r4
@ subtract out previous reloc value (first entry in GOT) -- this is necessary to prevent
@ double-fixups of the GOT table, thanks segher
ldr r0, [r1]
mov r5, r4
sub r5, r0
got_loop:
@ check for the end
cmp r1, r2
beq done_got
@ read the GOT entry
ldr r3, [r1]
@ add our base address
add r3, r5
str r3, [r1]
@ move on
add r1, r1, #4
b got_loop
done_got:
@ clear BSS
ldr r1, =__bss_start
add r1, r4
ldr r2, =__bss_end
add r2, r4
mov r3, #0
bss_loop:
@ check for the end
cmp r1, r2
beq done_bss
@ clear the word and move on
str r3, [r1]
add r1, r1, #4
b bss_loop
done_bss:
mov r0, #0x44
bl debug_output
@ take the plunge
mov r0, r7
bl _main
@ _main returned! Go to whatever address it returned...
mov r1, r0
mov r0, r4
mov pc, r1
.pool
@ misc low-level funcs used by other parts of the code
debug_output:
@ load address of port
mov r3, #0xd800000
@ load old value
ldr r2, [r3, #0xe0]
@ clear debug byte
bic r2, r2, #0xFF0000
@ insert new value
and r0, r0, #0xFF
orr r2, r2, r0, LSL #16
@ store back
str r2, [r3, #0xe0]
bx lr
dc_flush:
mrc p15, 0, pc, c7, c10, 3
bne dc_flush
bx lr
irq_kill:
mrs r1, cpsr
and r0, r1, #0xc0
orr r1, r1, #0xc0
msr cpsr_c, r1
bx lr
disable_icache_dcache_mmu:
mrc p15, 0, r0, c1, c0
bic r0, r0, #0x1000
bic r0, r0, #0x5
mcr p15, 0, r0, c1, c0
bx lr
jump_to_r0:
mov pc, r0

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/*
mini - a Free Software replacement for the Nintendo/BroadOn IOS.
ELF loader: types
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
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, version 2.
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
*/
#ifndef __TYPES_H__
#define __TYPES_H__
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned long long u64;
typedef signed char s8;
typedef signed short s16;
typedef signed int s32;
typedef signed long long s64;
typedef volatile unsigned char vu8;
typedef volatile unsigned short vu16;
typedef volatile unsigned int vu32;
typedef volatile unsigned long long vu64;
typedef volatile signed char vs8;
typedef volatile signed short vs16;
typedef volatile signed int vs32;
typedef volatile signed long long vs64;
typedef s32 size_t;
#define NULL ((void *)0)
#endif

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/* babelfish -- misc (C) utility functions */
#include "types.h"
#include "utils.h"
#include "hollywood.h"
#include <stdarg.h>
extern void debug_output(u8 byte); // from start.S
static inline void delay(u32 d)
{
write32(HW_TIMER, 0);
while(read32(HW_TIMER) < d);
}
void panic(u8 v)
{
while(1) {
debug_output(v);
delay(1000000);
debug_output(0);
delay(1000000);
}
}
/*
void *memcpy(void *dst, const void *src, size_t len)
{
size_t i;
for (i = 0; i < len; i++)
((unsigned char *)dst)[i] = ((unsigned char *)src)[i];
return dst;
}
*/
void *memcpyr(void *dst, const void *src, size_t len)
{
size_t i;
for (i = len; i > 0; i--)
((unsigned char *)dst)[i-1] = ((unsigned char *)src)[i-1];
return dst;
}
int memcmp(const void *s1, const void *s2, size_t len)
{
size_t i;
const unsigned char * p1 = (const unsigned char *) s1;
const unsigned char * p2 = (const unsigned char *) s2;
for (i = 0; i < len; i++)
if (p1[i] != p2[i]) return p1[i] - p2[i];
return 0;
}
/*size_t strlcat(char *dest, const char *src, size_t maxlen)
{
size_t len;
maxlen--;
for (len = 0; len < maxlen; len++) if (!dest[len]) break;
for (; len < maxlen && *src; len++) dest[len] = *src++;
dest[len] = '\0';
return len;
}
*/
s32 printf (const char* str, ...) {
va_list arp;
u8 c, f, r;
u32 val, pos;
char s[16];
s32 i, w, res, cc;
va_start(arp, str);
for (cc = pos = 0;; ) {
c = *str++;
if (c == 0) break; /* End of string */
if (c != '%') { /* Non escape cahracter */
gecko_putc(c);
pos++;
continue;
}
w = f = 0;
c = *str++;
if (c == '0') { /* Flag: '0' padding */
f = 1; c = *str++;
}
while (c >= '0' && c <= '9') { /* Precision */
w = w * 10 + (c - '0');
c = *str++;
}
if (c == 's') { /* Type is string */
char *param = va_arg(arp, char*);
for (i=0; param[i]; i++) {
gecko_putc(param[i]);
pos++;
}
continue;
}
r = 0;
if (c == 'd') r = 10; /* Type is signed decimal */
if (c == 'u') r = 10; /* Type is unsigned decimal */
if (c == 'X' || c == 'x') r = 16; /* Type is unsigned hexdecimal */
if (r == 0) {
break; /* Unknown type */
}
val = (c == 'd') ? (u32)(long)va_arg(arp, int) :
(u32)va_arg(arp, unsigned int);
/* Put numeral string */
if (c == 'd') {
if (val & 0x80000000) {
val = 0 - val;
f |= 4;
}
}
// if ((maxlen - pos) <= sizeof(s)) continue;
i = sizeof(s) - 1; s[i] = 0;
do {
// c = (u8)(val % r + '0');
c = (u8)((val & 15) + '0');
if (c > '9') c += 7;
s[--i] = c;
// val /= r;
val >>= 4;
} while (i && val);
if (i && (f & 4)) s[--i] = '-';
w = sizeof(s) - 1 - w;
while (i && i > w) s[--i] = (f & 1) ? '0' : ' ';
for (; s[i] ; i++) {
gecko_putc(s[i]);
pos++;
}
}
va_end(arp);
// gecko_puts(output);
return pos;
}
int puts(const char *s) {
gecko_puts(s);
return 0;
}

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#ifndef __UTILS_H__
#define __UTILS_H__
static inline u32 read32(u32 addr)
{
u32 data;
__asm__ volatile ("ldr\t%0, %1" : "=l" (data) : "m"(*(u32 *)addr));
return data;
}
static inline void write32(u32 addr, u32 data)
{
__asm__ volatile ("str\t%1, %0" : "=m"(*(u32 *)addr) : "l"(data));
}
static inline u32 set32(u32 addr, u32 set)
{
u32 data;
__asm__ volatile (
"ldr\t%0, [%1]\n"
"\torr\t%0, %2\n"
"\tstr\t%0, [%1]"
: "=&r" (data)
: "r" (addr), "r" (set)
);
return data;
}
static inline u32 clear32(u32 addr, u32 clear)
{
u32 data;
__asm__ volatile (
"ldr\t%0, [%1]\n"
"\tbic\t%0, %2\n"
"\tstr\t%0, [%1]"
: "=&r" (data)
: "r" (addr), "r" (clear)
);
return data;
}
static inline u32 mask32(u32 addr, u32 clear, u32 set)
{
u32 data;
__asm__ volatile (
"ldr\t%0, [%1]\n"
"\tbic\t%0, %3\n"
"\torr\t%0, %2\n"
"\tstr\t%0, [%1]"
: "=&r" (data)
: "r" (addr), "r" (set), "r" (clear)
);
return data;
}
static inline u16 read16(u32 addr)
{
u32 data;
__asm__ volatile ("ldrh\t%0, [%1]" : "=l" (data) : "l" (addr));
return data;
}
static inline void write16(u32 addr, u16 data)
{
__asm__ volatile ("strh\t%0, [%1]" : : "l" (data), "l" (addr));
}
void panic(u8 v);
size_t strlen(const char *);
void *memset(void *, int, size_t);
//void *memcpy(void *, const void *, size_t);
void *memcpyr(void *, const void *, size_t);
int memcmp(const void *, const void *, size_t);
s32 printf (const char* format, ...);
int puts(const char *);
#endif

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@ I believe Sven wrote these? Thanks sven :)
.ARM
.text
swi_vector:
stmfa sp!, {r0-r4, lr}
@ check SWI number
@ should work for ARM and THUMB (yay bigendian):
@
@ ARM:
@ OOnnnnNN BBBBBBBB
@ |--| ^--LR
@ ^--halfword retreived, mask last 8 bits to get number
@ THUMB:
@ xxxx OONN BBBB CCCC
@ |--| ^--LR
@ ^--halfword retreived, mask last 8 bits to get number
ldrh r3, [lr, #-2]
and r3, r3, #0xFF
cmp r3, #0xAB
bne return
@ check operation number (4=debug print)
cmp r0, #4
bne return
@ gpio port
ldr r3, =0x0d806814
loop:
ldrb r2, [r1]
bl send
add r1, #1
cmp r2, #0x00
bne loop
@ optional code to insert linefeed at the end of each print, some IOS modules seem to need this
@ to get sane output
@ mov r2, #0xa
@ bl send
return:
ldmfa sp!, {r0-r4, lr}
movs pc, lr
@ send a string over USBGecko
send:
mov r0, #0xd0
str r0, [r3, #0x00]
mov r0, #0xB0000000
orr r0, r0, r2, LSL #20
str r0, [r3, #0x10]
mov r0, #0x19
str r0, [r3, #0x0c]
sendloop:
ldr r0, [r3, #0x0c]
tst r0, #1
bne sendloop
ldr r0, [r3, #0x10]
tst r0, #0x04000000
mov r0, #0
str r0, [r3, #0x00]
beq send
mov pc, lr
.POOL