// Link module to CHDK core code.
// Functions and variables to link to are mapped via the symbol_hash_table array.
// The link information in the module comprises 'import_count' int values (4 bytes each)
// grouped into blocks. Each block is defined as:
// - function / variable symbol hash
// - N x int values, each value specifies the offset in the module to link
// The value of N is stored in the top 8 bits of the first value in list.
// Each location to link is assumed to be a pointer (4 bytes) into the CHDK core memory.
// To update each link location add the initial value stored to the link address found in the symbol table.
static int module_do_imports(flat_hdr* flat, void* relocbuf, uint32_t import_count)
{
int i;
unsigned char* buf = (unsigned char*)flat; // base address of module in memory
uint32_t* rbuf = (uint32_t*)relocbuf; // link array
for (i=0; i < import_count;)
{
// Find CHDK address of symbol via hash value, if not found return error
int importaddress = (int)module_find_symbol_address(rbuf[i++]);
if (importaddress == 0) return 0;
// Get number of locations in module to link
int cnt = rbuf[i] >> 24;
for (; cnt>0; cnt--)
{
// Get offset into module (exclude count value)
uint32_t offs = rbuf[i++] & 0x00FFFFFF;
// Add initial value at location to symbol address
*(uint32_t*)(buf+offs) += importaddress;
}
}
return 1;
}
//---------------------------------------------------------
// PURPOSE: Bind module symbols with chdk.
// Required function
// PARAMETERS: pointer to chdk list of export
// RETURN VALUE: 1 error, 0 ok
//---------------------------------------------------------
int _module_loader( unsigned int* chdk_export_list )
{
if ( chdk_export_list[0] != EXPORTLIST_MAGIC_NUMBER )
return 1;
// If "gui_menu_run_fltmodule" is 0, then menu system is changed
if ( module_find_symbol_address(MODULESYM_GUI_MENU_RUN_FLTMODULE) == 0)
return 1;
if ( !API_VERSION_MATCH_REQUIREMENT( gui_version.menu_api, 1, 0 ) )
return 1;
return 0;
}
static int module_do_imports( struct flat_hdr* flat, void* relocbuf, uint32_t import_count )
{
int i;
unsigned char* buf = (unsigned char*)flat;
uint32_t* rbuf = (uint32_t*)relocbuf;
for ( i=0; i < import_count; )
{
const void* importaddress = module_find_symbol_address(rbuf[i++]);
if (importaddress == 0) return 0;
int cnt = rbuf[i] >> 24;
for (; cnt>0; cnt--)
{
uint32_t offs = rbuf[i++] & 0x00FFFFFF;
uint32_t* ptr = (uint32_t*)( buf + offs );
*ptr += (int)importaddress;
}
}
return 1;
}
