/*****************************************************************************/

/*  pemagination: a (virtual) tour into portable bits and executable bytes   */

/*  Copyright (C) 2013--2020  Z. Gilboa                                      */

/*  Released under GPLv2 and GPLv3; see COPYING.PEMAGINE.                    */

/*****************************************************************************/

#include <psxtypes/psxtypes.h>

#include <pemagine/pe_consts.h>

#include <pemagine/pe_structs.h>

#include <pemagine/pemagine.h>

#include "pe_impl.h"

static int pe_enum_modules(

	pe_enum_modules_callback *	callback,

	const uintptr_t			in_order_member_offset,

	void *				context)

{

	int				ret;

	uintptr_t 			peb_tbl_addr;

	struct pe_peb_ldr_data *	peb_ldr_data;

	struct pe_ldr_tbl_entry *	ldr_tbl_entry;

	struct pe_list_entry *		plist_head;

	struct pe_list_entry * 		plist_current;

	peb_ldr_data = (struct pe_peb_ldr_data *)pe_get_peb_ldr_data_address();

	plist_head   = (struct pe_list_entry *)0;

	if ((intptr_t)peb_ldr_data == 0) {

		callback(

			0,

			PE_CALLBACK_REASON_ERROR,

			context);

		return -1;

	}

	ret = callback(

		0,

		PE_CALLBACK_REASON_INIT,

		context);

	if (ret <= 0)

		return ret;

	switch (in_order_member_offset) {

		case IN_LOAD_ORDER_MODULE_LIST_OFFSET:

			plist_head = peb_ldr_data->in_load_order_module_list.flink;

			break;

		case IN_MEMORY_ORDER_MODULE_LIST_OFFSET:

			plist_head = peb_ldr_data->in_memory_order_module_list.flink;

			break;

		case IN_INITIALIZATION_ORDER_MODULE_LIST_OFFSET:

			plist_head = peb_ldr_data->in_init_order_module_list.flink;

			break;

	}

	plist_current = plist_head;

	do {

		peb_tbl_addr	= (uintptr_t)plist_current - in_order_member_offset;

		ldr_tbl_entry	= (struct pe_ldr_tbl_entry *)peb_tbl_addr;

		ret = callback(

			ldr_tbl_entry,

			PE_CALLBACK_REASON_ITEM,

			context);

		if (ret <= 0)

			return ret;

		else

			plist_current = plist_current->flink;

	} while (plist_current != plist_head);

	ret = callback(

			ldr_tbl_entry,

			PE_CALLBACK_REASON_DONE,

			context);

	return ret;

}

int pe_enum_modules_in_load_order(pe_enum_modules_callback * fn, void * ctx)

{

	return pe_enum_modules(fn,IN_LOAD_ORDER_MODULE_LIST_OFFSET,ctx);

}

int pe_enum_modules_in_memory_order(pe_enum_modules_callback * fn, void * ctx)

{

	return pe_enum_modules(fn,IN_MEMORY_ORDER_MODULE_LIST_OFFSET,ctx);

}

int pe_enum_modules_in_init_order(pe_enum_modules_callback * fn, void * ctx)

{

	return pe_enum_modules(fn,IN_INITIALIZATION_ORDER_MODULE_LIST_OFFSET,ctx);

}