Revision 9ad5f3a4dfb76a98a6d063a9dd8b832e24aa413c authored by hudson@kremvax.wan on 31 January 2010, 23:19:42 UTC, committed by hudson@kremvax.wan on 31 January 2010, 23:19:42 UTC
1 parent ba2bb63
5d-hack.c
/** \file
* Code to run on the 5D once it has been relocated.
*
* This has been updated to work with the 1.1.0 firmware.
* IT DOES NOT WORK WITH 1.0.7 ANY MORE!
*/
/*
* Copyright (C) 2009 Trammell Hudson <hudson+ml@osresearch.net>
*
* 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; either version 2
* of the License, or (at your option) any later version.
*
* 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.,
* 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "dryos.h"
#include "config.h"
#include "version.h"
#include "bmp.h"
#include "menu.h"
#include "version.h"
/** These are called when new tasks are created */
void my_task_dispatch_hook( struct context ** );
void my_init_task(void);
void my_bzero( uint8_t * base, uint32_t size );
/** This just goes into the bss */
#define RELOCSIZE 0x10000
static uint8_t _reloc[ RELOCSIZE ];
#define RELOCADDR ((uintptr_t) _reloc)
/** Translate a firmware address into a relocated address */
#define INSTR( addr ) ( *(uint32_t*)( (addr) - ROMBASEADDR + RELOCADDR ) )
/** Fix a branch instruction in the relocated firmware image */
#define FIXUP_BRANCH( rom_addr, dest_addr ) \
INSTR( rom_addr ) = BL_INSTR( &INSTR( rom_addr ), (dest_addr) )
/** Specified by the linker */
extern uint32_t _bss_start[], _bss_end[];
static inline void
zero_bss( void )
{
uint32_t *bss = _bss_start;
while( bss < _bss_end )
*(bss++) = 0;
}
void
__attribute__((noreturn,noinline,naked))
copy_and_restart( void )
{
zero_bss();
// Copy the firmware to somewhere in memory
// bss ends at 0x47750, so we'll use 0x50000
const uint8_t * const firmware_start = (void*) ROMBASEADDR;
const uint32_t firmware_len = RELOCSIZE;
uint32_t * const new_image = (void*) RELOCADDR;
blob_memcpy( new_image, firmware_start, firmware_start + firmware_len );
/*
* in entry2() (0xff812a98) make this change:
*/
// Return to our code before calling cstart()
INSTR( 0xFF812AE8 ) = RET_INSTR;
/*
* in cstart() (0xff810894) make these changes:
*/
// Reserve memory after the BSS for our application
INSTR( 0xFF81093C ) = (uintptr_t) _bss_end;
// Fix the calls to bzero32() and create_init_task()
FIXUP_BRANCH( 0xFF8108A4, bzero32 );
FIXUP_BRANCH( 0xFF81092C, create_init_task );
// Set our init task to run instead of the firmware one
INSTR( 0xFF810948 ) = (uint32_t) my_init_task;
// Make sure that our self-modifying code clears the cache
clean_d_cache();
flush_caches();
// We enter after the signature, avoiding the
// relocation jump that is at the head of the data
thunk reloc_entry = (thunk)( RELOCADDR + 0xC );
reloc_entry();
/*
* We're back!
* The RAM copy of the firmware startup has:
* 1. Poked the DMA engine with what ever it does
* 2. Copied the rw_data segment to 0x1900 through 0x20740
* 3. Zeroed the BSS from 0x20740 through 0x47550
* 4. Copied the interrupt handlers to 0x0
* 5. Copied irq 4 to 0x480.
* 6. Installed the stack pointers for CPSR mode D2 and D3
* (we are still in D3, with a %sp of 0x1000)
* 7. Returned to us.
*
* Now is our chance to fix any data segment things, or
* install our own handlers.
*/
// Install our task creation hooks
task_dispatch_hook = my_task_dispatch_hook;
// This will jump into the RAM version of the firmware,
// but the last branch instruction at the end of this
// has been modified to jump into the ROM version
// instead.
void (*ram_cstart)(void) = (void*) &INSTR( cstart );
ram_cstart();
// Unreachable
while(1)
;
}
void
null_task( void )
{
DebugMsg( DM_SYS, 3, "%s created (and exiting)", __func__ );
return;
}
/**
* Called by DryOS when it is dispatching (or creating?)
* a new task.
*/
void
my_task_dispatch_hook(
struct context ** context
)
{
if( !context )
return;
// Determine the task address
struct task * task = (struct task*)
( ((uint32_t)context) - offsetof(struct task, context) );
// Do nothing unless a new task is starting via the trampoile
if( task->context->pc != (uint32_t) task_trampoline )
return;
thunk entry = (thunk) task->entry;
// Search the task_mappings array for a matching entry point
extern struct task_mapping _task_overrides_start[];
extern struct task_mapping _task_overrides_end[];
const struct task_mapping * mapping = _task_overrides_start;
for( ; mapping < _task_overrides_end ; mapping++ )
{
thunk original_entry = mapping->orig;
if( original_entry != entry )
continue;
/* -- can't call debugmsg from this context */
#if 0
DebugMsg( DM_SYS, 3, "***** Replacing task %x with %x",
original_entry,
mapping->replacement
);
#endif
task->entry = mapping->replacement;
break;
}
}
/** First task after a fresh rebuild.
*
* Try to dump the debug log after ten seconds.
* This requires the create_task(), dmstart(), msleep() and dumpf()
* routines to have been found.
*/
void
my_dump_task( void )
{
dmstart();
msleep( 10000 );
dispcheck();
dumpf();
dmstop();
}
struct config * global_config;
static volatile int init_funcs_done;
static void
call_init_funcs( void * priv )
{
// Call all of the init functions
extern struct task_create _init_funcs_start[];
extern struct task_create _init_funcs_end[];
struct task_create * init_func = _init_funcs_start;
for( ; init_func < _init_funcs_end ; init_func++ )
{
DebugMsg( DM_MAGIC, 3,
"Calling init_func %s (%x)",
init_func->name,
(unsigned) init_func->entry
);
thunk entry = (thunk) init_func->entry;
entry();
}
init_funcs_done = 1;
}
/** Initial task setup.
*
* This is called instead of the task at 0xFF811DBC.
* It does all of the stuff to bring up the debug manager,
* the terminal drivers, stdio, stdlib and armlib.
*/
void
my_init_task(void)
{
// Call their init task
init_task();
// Overwrite the PTPCOM message
dm_names[ DM_MAGIC ] = "[MAGIC] ";
DebugMsg( DM_MAGIC, 3, "Magic Lantern %s (%s)",
build_version,
build_id
);
DebugMsg( DM_MAGIC, 3, "Built on %s by %s",
build_date,
build_user
);
dmstart();
// Re-write the version string.
// Don't use strcpy() so that this can be done
// before strcpy() or memcpy() are located.
extern char additional_version[];
additional_version[0] = '-';
additional_version[1] = 'm';
additional_version[2] = 'l';
additional_version[3] = '-';
additional_version[4] = build_version[0];
additional_version[5] = build_version[1];
additional_version[6] = build_version[2];
additional_version[7] = build_version[3];
additional_version[8] = build_version[4];
additional_version[9] = '\0';
msleep( 750 );
menu_init();
debug_init();
msleep( 500 );
// Parse our config file
const char * config_filename = "A:/magiclantern.cfg";
global_config = config_parse_file( config_filename );
bmp_printf( FONT_MED, 0, 40,
"Magic Lantern version %s (%s)\n"
"Built on %s by %s\n",
build_version,
build_id,
build_date,
build_user
);
bmp_printf( FONT_MED, 0, 400,
"Config file %s: %s",
config_filename,
global_config ? "YES" : "NO"
);
msleep( 500 );
init_funcs_done = 0;
//task_create( "init_func", 0x1f, 0x1000, call_init_funcs, 0 );
//while( !init_funcs_done )
//msleep(10);
call_init_funcs( 0 );
msleep( 1000 );
#if 1
// Create all of our auto-create tasks
extern struct task_create _tasks_start[];
extern struct task_create _tasks_end[];
struct task_create * task = _tasks_start;
for( ; task < _tasks_end ; task++ )
{
DebugMsg( DM_MAGIC, 3,
"Creating task %s(%d) pri=%02x flags=%08x",
task->name,
task->arg,
task->priority,
task->flags
);
task_create(
task->name,
task->priority,
task->flags,
task->entry,
task->arg
);
}
#endif
DebugMsg( DM_MAGIC, 3, "magic lantern init done" );
}
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