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

/*  ntapi: Native API core library                      */

/*  Copyright (C) 2013--2021  SysDeer Technologies, LLC */

/*  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/nt_atomic.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 __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;

}

static int32_t __tt_create_thread_stack(

	nt_thread_params *	params,

	nt_user_stack *		stack)

{

	int32_t		status;

	uint32_t	protect_type_old;

	void *		stack_system_limit;

	char *		base;

	size_t		size;

	size_t		commit;

	/* caller-provided stack? */

	if (params->stack_info && params->stack_info->expandable_stack_base) {

		stack->fixed_stack_base        = params->stack_info->fixed_stack_base;

		stack->fixed_stack_limit       = params->stack_info->fixed_stack_limit;

		stack->expandable_stack_base   = params->stack_info->expandable_stack_base;

		stack->expandable_stack_limit  = params->stack_info->expandable_stack_limit;

		stack->expandable_stack_bottom = params->stack_info->expandable_stack_bottom;

		return NT_STATUS_SUCCESS;

	}

	/* init */

	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  = 0;

	stack->fixed_stack_limit = 0;

	/* first we reserve */

	stack->expandable_stack_bottom = 0;

	if ((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)))

		return status;

	/* calculate base and limit */

	base  = stack->expandable_stack_bottom;

	base += params->stack_size_reserve;

	stack->expandable_stack_base   = base;

	stack->expandable_stack_limit  = base - params->stack_size_commit;

	/* guard page */

	commit             = params->stack_size_commit + __PAGE_SIZE;

	stack_system_limit = base - commit;

	/* then we commit */

	if ((status = __ntapi->zw_allocate_virtual_memory(

			params->hprocess,

			&stack_system_limit,

			0,&commit,

			NT_MEM_COMMIT,

			NT_PAGE_READWRITE)))

		return __create_thread_fail(

			params->hprocess,

			stack->expandable_stack_bottom,

			params->stack_size_reserve,

			status);

	/* finally we protect the guard page */

	size = __PAGE_SIZE;

	if ((status = __ntapi->zw_protect_virtual_memory(

			params->hprocess,

			&stack_system_limit,

			&size,

			NT_PAGE_READWRITE | NT_MEM_PAGE_GUARD,

			&protect_type_old)))

		return __create_thread_fail(

			params->hprocess,

			stack->expandable_stack_bottom,

			params->stack_size_reserve,

			status);

	/* all done */

	if (params->stack_info) {

		params->stack_info->fixed_stack_base        = stack->fixed_stack_base;

		params->stack_info->fixed_stack_limit       = stack->fixed_stack_limit;

		params->stack_info->expandable_stack_base   = stack->expandable_stack_base;

		params->stack_info->expandable_stack_limit  = stack->expandable_stack_limit;

		params->stack_info->expandable_stack_bottom = stack->expandable_stack_bottom;

		return NT_STATUS_SUCCESS;

	}

	return NT_STATUS_SUCCESS;

}

int32_t __stdcall __ntapi_tt_create_thread(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;

	nt_thread_context 	__attr_aligned__(0x40) context;

	nt_user_stack		__attr_aligned__(0x10) stack;

	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();

	/* stack */

	if ((status = __tt_create_thread_stack(params,&stack)))

		return status;

	/* context */

	if (params->reg_context) {

		__ntapi->tt_aligned_block_memcpy(

			(uintptr_t *)&context,

			(uintptr_t *)params->reg_context,

			sizeof(context));

	} else {

		__ntapi->tt_aligned_block_memset(

			&context,0,sizeof(context));

		__INIT_CONTEXT(context);

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

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

	}

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

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

/*                                                                           */

/*                                                                           */

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

/*                                                                           */

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

/*                                                                           */

/*                   COPYRIGHT (C) 2013--2021 SysDeer Technologies, LLC      */

/*                                                                           */

/*                                                                           */

/*                                                                           */

/*      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);                     /**/

/**/                                                                       /**/

/**/			__ntapi->tt_aligned_block_memlock(                 /**/

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

/**/				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(intptr_t) == 8) {                                       /**/

/**/		at_store(                                                  /**/

/**/			(intptr_t *)parg,                                  /**/

/**/			(intptr_t)params->arg);                            /**/

/**/                                                                       /**/

/**/	} else if (params->creation_flags & NT_CREATE_LOCAL_THREAD) {      /**/

/**/		at_store(                                                  /**/

/**/			(intptr_t *)parg,                                  /**/

/**/			(intptr_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 */

	fsuspended = (params->creation_flags & NT_CREATE_SUSPENDED)

		? 1 : __ntapi->zw_create_user_process

			? 0 : 1;

	if ((status = __ntapi->zw_create_thread(

			&params->hthread,

			NT_THREAD_ALL_ACCESS,

			params->obj_attr,

			params->hprocess,

			&cid,&context,&stack,

			fsuspended)))

		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->cid.process_id = cid.process_id;

	params->cid.thread_id  = cid.thread_id;

	return NT_STATUS_SUCCESS;

}

int32_t __stdcall __ntapi_tt_create_local_thread(nt_thread_params * params)

{

	nt_status			status;

	void *				image_base;

	struct pe_stack_heap_info	stack_heap_info;

	/* flags */

	params->creation_flags |= NT_CREATE_LOCAL_THREAD;

	/* hprocess */

	if (!params->hprocess)

		params->hprocess = __ntapi_internals()->hprocess;

	/* stack defaults */

	if (params->stack_info)

		(void)0;

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

		(void)0;

	else {

		/* image_base*/

		if (!(image_base = pe_get_first_module_handle()))

			return NT_STATUS_INVALID_IMPORT_OF_NON_DLL;

		if ((status = pe_get_image_stack_heap_info(

				image_base,

				&stack_heap_info)))

			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;

	}

	return __ntapi_tt_create_thread(params);

}

int32_t __stdcall __ntapi_tt_create_remote_thread(nt_thread_params * params)

{

	return __ntapi_tt_create_thread(params);

}

void * __cdecl __ntapi_csr_port_handle(nt_status * pstatus)

{

	nt_status		status;

	ntapi_internals *	__internals;

	pstatus     = pstatus ? pstatus : &status;

	__internals = __ntapi_internals();

	if (__internals->csr_port_handle_addr) {

		*pstatus = NT_STATUS_SUCCESS;

		return *__internals->csr_port_handle_addr;

	} else {

		*pstatus = NT_STATUS_UNSUCCESSFUL;

		return 0;

	}

}