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

/*  ntapi: Native API core library                      */

/*  Copyright (C) 2013--2016  Z. Gilboa                 */

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

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

#include <psxtypes/psxtypes.h>

#include <pemagine/pemagine.h>

#include <ntapi/nt_status.h>

#include <ntapi/nt_object.h>

#include <ntapi/nt_memory.h>

#include <ntapi/nt_thread.h>

#include <ntapi/nt_process.h>

#include <ntapi/nt_string.h>

#include <ntapi/ntapi.h>

#include "ntapi_impl.h"

/* (no planned support of alpha processors, use constant values) */

#define __PAGE_SIZE 		0x001000

#define __GRANULARITY		0x010000

#define __RESERVE_ROUND_UP	0x100000

static int32_t __stdcall __create_thread_fail(

	void *	hprocess,

	void *	stack_bottom,

	size_t	stack_size,

	int32_t status)

{

	__ntapi->zw_free_virtual_memory(

		hprocess,

		&stack_bottom,

		&stack_size,

		NT_MEM_RELEASE);

	return status;

}

int32_t __stdcall __ntapi_tt_create_thread(

	__in_out	nt_thread_params *	params)

{

	int32_t				status;

	ntapi_internals *		__internals;

	nt_client_id			cid;

	nt_port_message_csrss_process	csrss_msg;

	nt_port_message_csrss_process *	csrss_msg_1st;

	nt_port_message_csrss_thread *	csrss_msg_any;

	void *			stack_system_limit;

	uint32_t		protect_type_old;

	nt_user_stack		stack;

	nt_thread_context 	context;

	uintptr_t		fsuspended;

	uintptr_t *		parg;

	if (!(params->stack_size_commit))

		return NT_STATUS_INVALID_PARAMETER;

	else if (!(params->stack_size_reserve))

		return NT_STATUS_INVALID_PARAMETER;

	else if (params->ext_ctx_size > __NT_INTERNAL_PAGE_SIZE)

		return NT_STATUS_INVALID_PARAMETER;

	else if (params->ext_ctx_size % sizeof(intptr_t))

		return NT_STATUS_INVALID_PARAMETER;

	else if (params->arg && params->ext_ctx)

		return NT_STATUS_INVALID_PARAMETER_MIX;

	else if (params->ext_ctx && !params->ext_ctx_size)

		return NT_STATUS_INVALID_PARAMETER_MIX;

	/* init */

	__internals  = __ntapi_internals();

	params->stack_size_commit  = __NT_ROUND_UP_TO_POWER_OF_2(params->stack_size_commit+params->ext_ctx_size, __PAGE_SIZE);

	params->stack_size_reserve = __NT_ROUND_UP_TO_POWER_OF_2(params->stack_size_reserve,__GRANULARITY);

	/* compare, round-up as needed */

	if (params->stack_size_commit >= params->stack_size_reserve)

		params->stack_size_reserve = __NT_ROUND_UP_TO_POWER_OF_2(params->stack_size_commit,__RESERVE_ROUND_UP);

	/**

	  *

	  *  --------- BASE ----------

	  *

	  *  ---- (COMMITED AREA) ----

	  *

	  *  --------- LIMIT ---------

	  *

	  *  ------ GUARD PAGE -------

	  *

	  *  ------ ACTUAL LIMIT -----

	  *

	  *  ---- (RESERVED AREA) ----

	  *

	  *  -------- BOTTOM ---------

	  *

	**/

	/* stack structure: unused fields */

	stack.fixed_stack_base  = (void *)0;

	stack.fixed_stack_limit = (void *)0;

	/* first we reserve */

	stack.expandable_stack_bottom = (void *)0;

	status = __ntapi->zw_allocate_virtual_memory(

		params->hprocess,

		&stack.expandable_stack_bottom,

		params->stack_zero_bits,

		&params->stack_size_reserve,

		NT_MEM_RESERVE,

		NT_PAGE_READWRITE);

	if (status) return status;

	/* calculate base and limit */

	stack.expandable_stack_base =

		(void *)((intptr_t)stack.expandable_stack_bottom

			+ params->stack_size_reserve);

	stack.expandable_stack_limit =

		(void *)((intptr_t)stack.expandable_stack_base

			- params->stack_size_commit);

	/* guard page */

	params->stack_size_commit += __PAGE_SIZE;

	stack_system_limit =

		(void *)((intptr_t)stack.expandable_stack_base

			- params->stack_size_commit);

	/* then we commit */

	status = __ntapi->zw_allocate_virtual_memory(

		params->hprocess,

		&stack_system_limit,

		0,

		&params->stack_size_commit,

		NT_MEM_COMMIT,

		NT_PAGE_READWRITE);

	if (status) return __create_thread_fail(

		params->hprocess,

		stack.expandable_stack_bottom,

		params->stack_size_reserve,

		status);

	/* finally we protect the guard page */

	params->stack_size_commit = __PAGE_SIZE;

	status = __ntapi->zw_protect_virtual_memory(

		params->hprocess,

		&stack_system_limit,

		&params->stack_size_commit,

		NT_PAGE_READWRITE | NT_MEM_PAGE_GUARD,

		&protect_type_old);

	if (status) return __create_thread_fail(

		params->hprocess,

		stack.expandable_stack_bottom,

		params->stack_size_reserve,

		status);

	/* context */

	if (!params->reg_context) {

		params->reg_context = &context;

		__ntapi->tt_aligned_block_memset(&context,0,sizeof(nt_thread_context));

		__INIT_CONTEXT(context);

		context.INSTRUCTION_POINTER_REGISTER = (uintptr_t)params->start;

		context.STACK_POINTER_REGISTER = (uintptr_t)(stack.expandable_stack_base)

						- sizeof(intptr_t);

	}

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

/*-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-*/

/*                                                                           */

/*                                                                           */

/*      INNOVATION IN THE FIELD OF MULTI-THREADED COMPUTER PROGRAMMING       */

/*                                                                           */

/*      A "RAPUNZEL" TOP-OF-STACK, VARIABLE-SIZE ENTRY-ROUTINE CONTEXT       */

/*                                                                           */

/*                   COPYRIGHT (C) 2013,2014,2015 ZVI GILBOA                 */

/*                                                                           */

/*                                                                           */

/*                                                                           */

/*      Laß mir dein Haar herunter.«                                         */

/**/	if (params->ext_ctx) {                                             /**/

/**/		context.STACK_POINTER_REGISTER -= params->ext_ctx_size;    /**/

/**/		params->arg = (void *)context.STACK_POINTER_REGISTER;      /**/

/**/                                                                       /**/

/**/		if (params->creation_flags & NT_CREATE_LOCAL_THREAD)       /**/

/**/			__ntapi->tt_aligned_block_memcpy(                  /**/

/**/				(uintptr_t *)params->arg,                  /**/

/**/				(uintptr_t *)params->ext_ctx,              /**/

/**/				params->ext_ctx_size);                     /**/

/**/		else {                                                     /**/

/**/			status = __ntapi->zw_write_virtual_memory(         /**/

/**/				params->hprocess,                          /**/

/**/				params->arg,                               /**/

/**/				(char *)params->ext_ctx,                   /**/

/**/				params->ext_ctx_size,                      /**/

/**/				0);                                        /**/

/**/                                                                       /**/

/**/			if (status) return __create_thread_fail(           /**/

/**/				params->hprocess,                          /**/

/**/				stack.expandable_stack_bottom,             /**/

/**/				params->stack_size_reserve,                /**/

/**/				status);                                   /**/

/**/		}                                                          /**/

/**/	}                                                                  /**/

/**/                                                                       /**/

/**/                                                                       /**/

/**/                                                                       /**/

/*      entry-routine argument address and stack pointer adjustment          */

/**/	if (sizeof(intptr_t) == 4) {                                       /**/

/**/		context.STACK_POINTER_REGISTER -= sizeof(intptr_t);        /**/

/**/		parg  = (uintptr_t *)context.STACK_POINTER_REGISTER;       /**/

/**/	} else                                                             /**/

/**/		parg  = &context.FAST_CALL_ARG0;                           /**/

/**/                                                                       /**/

/**/                                                                       /**/

/*      write entry-routine argument                                         */

/**/	if ((sizeof(size_t) == 8)                                          /**/

/**/			|| (params->creation_flags&NT_CREATE_LOCAL_THREAD))/**/

/**/		*parg = (uintptr_t)params->arg;                            /**/

/**/	else {                                                             /**/

/**/		status = __ntapi->zw_write_virtual_memory(                 /**/

/**/			params->hprocess,                                  /**/

/**/			parg,                                              /**/

/**/			(char *)&params->arg,                              /**/

/**/			sizeof(uintptr_t),                                 /**/

/**/			0);                                                /**/

/**/                                                                       /**/

/**/		if (status) return __create_thread_fail(                   /**/

/**/			params->hprocess,                                  /**/

/**/			stack.expandable_stack_bottom,                     /**/

/**/			params->stack_size_reserve,                        /**/

/**/			status);                                           /**/

/**/	}                                                                  /**/

/**/                                                                       /**/

/**/                                                                       /**/

/*-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-*/

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

	/* create thread */

	if ((!__ntapi->zw_create_user_process) | (params->creation_flags & NT_CREATE_SUSPENDED))

		fsuspended = 1;

	else

		fsuspended = 0;

	status = __ntapi->zw_create_thread(

		&params->hthread,

		NT_THREAD_ALL_ACCESS,

		params->obj_attr,

		params->hprocess,

		&cid,

		params->reg_context,

		&stack,

		fsuspended);

	if (status) return __create_thread_fail(

		params->hprocess,

		stack.expandable_stack_bottom,

		params->stack_size_reserve,

		status);

	/* for os versions prior to hasta la */

	if (!__ntapi->zw_create_user_process) {

		__ntapi->tt_aligned_block_memset(&csrss_msg,0,sizeof(csrss_msg));

		if (params->creation_flags & NT_CREATE_FIRST_THREAD_OF_PROCESS) {

			/* nt_port_message_csrss_process is the larger structure */

			csrss_msg_1st = &csrss_msg;

			csrss_msg_1st->header.data_size		= sizeof(nt_port_message_csrss_process) - sizeof(nt_port_message);

			csrss_msg_1st->header.msg_size		= sizeof(nt_port_message_csrss_process);

			csrss_msg_1st->opcode			= 0x10000;

			csrss_msg_1st->hprocess			= params->hprocess;

			csrss_msg_1st->hthread			= params->hthread;

			csrss_msg_1st->unique_process_id	= cid.process_id;

			csrss_msg_1st->unique_thread_id		= cid.thread_id;

		} else {

			/* nt_port_message_csrss_thread is the smaller structure */

			csrss_msg_any = (nt_port_message_csrss_thread *)&csrss_msg;

			csrss_msg_any->header.data_size		= sizeof(nt_port_message_csrss_thread) - sizeof(nt_port_message);

			csrss_msg_any->header.msg_size		= sizeof(nt_port_message_csrss_thread);

			csrss_msg_any->opcode			= 0x10001;

			csrss_msg_any->hthread			= params->hthread;

			csrss_msg_any->unique_process_id	= cid.process_id;

			csrss_msg_any->unique_thread_id		= cid.thread_id;

		}

		/* send csrss a new-thread notification */

		if (__internals->csr_port_handle_addr) {

			status = __ntapi->zw_request_wait_reply_port(

				*__internals->csr_port_handle_addr,

				&csrss_msg,&csrss_msg);

		}

		/* output csrss_status to caller */

		params->csrss_status = status

			? status

			: csrss_msg.status;

	}

	/* resume thread, close handle as needed */

	if (fsuspended && !(params->creation_flags & NT_CREATE_SUSPENDED))

		status = __ntapi->zw_resume_thread(params->hthread,0);

	if (params->creation_flags & NT_CLOSE_THREAD_HANDLE)

		__ntapi->zw_close(params->hthread);

	/* and finally */

	params->thread_id = (uint32_t)cid.thread_id;

	return NT_STATUS_SUCCESS;

}

int32_t __stdcall __ntapi_tt_create_local_thread(

	__in_out	nt_thread_params *	params)

{

	void *				image_base;

	struct pe_stack_heap_info	stack_heap_info;

	nt_client_id			cid;

	nt_object_attributes		oa;

	nt_status			status;

        /* oa init */

	oa.len		= sizeof(oa);

	oa.root_dir	= (void *)0;

	oa.obj_name	= (nt_unicode_string *)0;

	oa.obj_attr	= 0;

	oa.sec_desc	= (nt_sd *)0;

	oa.sec_qos	= (nt_sqos *)0;

        /* init cid */

        cid.process_id = pe_get_current_process_id();

        cid.thread_id  = pe_get_current_thread_id();

	/* obtain a handle to our own process */

	/* TODO: use cached handle, no close  */

	status = __ntapi->zw_open_process(

		&params->hprocess,

		NT_PROCESS_ALL_ACCESS,

		&oa,

		&cid;;

	if (status) return status;

	/* retrieve the stack defaults as needed */

	if (!(params->stack_size_commit && params->stack_size_reserve) && !(params->stack_info)) {

		/* image_base*/

		image_base = pe_get_first_module_handle();

		if (!(intptr_t)image_base)

			return NT_STATUS_INVALID_IMPORT_OF_NON_DLL;

		status = pe_get_image_stack_heap_info(

			image_base,

			&stack_heap_info);

		if (status)

			return NT_STATUS_INVALID_IMAGE_FORMAT;

		/* stack_size_commit */

		if (!params->stack_size_commit)

			params->stack_size_commit = stack_heap_info.size_of_stack_commit;

		/* stack_size_reserve */

		if (!params->stack_size_reserve)

			params->stack_size_reserve = stack_heap_info.size_of_stack_reserve;

		if (!(params->stack_size_commit && params->stack_size_reserve))

			return NT_STATUS_INVALID_IMAGE_FORMAT;

	}

	params->creation_flags |= NT_CREATE_LOCAL_THREAD;

	status =  __ntapi_tt_create_thread(params);

	/* TODO: use cached handle, no close  */

	__ntapi->zw_close(params->hprocess);

	return status;

}

int32_t __stdcall __ntapi_tt_create_remote_thread(

	__in_out	nt_thread_params *	params)

{

	return __ntapi_tt_create_thread(params);

}

void * __cdecl __ntapi_csr_port_handle(nt_status * pstatus)

{

	ntapi_internals * __internals;

	__internals = __ntapi_internals();

	if (__internals->csr_port_handle_addr) {

		if (pstatus)

			*pstatus = NT_STATUS_SUCCESS;

		return *__internals->csr_port_handle_addr;

	} else {

		if (pstatus)

			*pstatus = NT_STATUS_UNSUCCESSFUL;

		return (void *)0;

	}

}