/***************************************************************************
 *   Copyright (C) 2011 by Broadcom Corporation                            *
 *   Evan Hunter - ehunter@broadcom.com                                    *
 *                                                                         *
 *   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.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif


#include "rtos.h"
#include "target/target.h"
#include "helper/log.h"
#include "server/gdb_server.h"


static int64_t current_threadid = -1;

static void hex_to_str( char* dst, char * hex_src );
static int str_to_hex( char* hex_dst, char* src );


/* RTOSs */
extern struct rtos_type FreeRTOS_rtos;
extern struct rtos_type ThreadX_rtos;
extern struct rtos_type eCos_rtos;

static struct rtos_type *rtos_types[] =
{
	&ThreadX_rtos,
	&FreeRTOS_rtos,
	&eCos_rtos,
	NULL
};


int rtos_create(Jim_GetOptInfo *goi, struct target * target)
{
	int x;
	char *cp;

	if (! goi->isconfigure) {
		if (goi->argc != 0) {
			if (goi->argc != 0) {
				Jim_WrongNumArgs(goi->interp,
						goi->argc, goi->argv,
						"NO PARAMS");
				return JIM_ERR;
			}

			Jim_SetResultString(goi->interp,
					target_type_name(target), -1);
		}
	}

	if (target->rtos) {
		free((void *)(target->rtos));
	}
//			e = Jim_GetOpt_String(goi, &cp, NULL);
//			target->rtos = strdup(cp);

	Jim_GetOpt_String(goi, &cp, NULL);
	/* now does target type exist */

	if ( 0 == strcmp( cp, "auto") )
	{
		// auto detection of RTOS
		target->rtos_auto_detect = true;
		x = 0;
	}
	else
	{

		for (x = 0 ; rtos_types[x] ; x++) {
			if (0 == strcmp(cp, rtos_types[x]->name)) {
				/* found */
				break;
			}
		}
		if (rtos_types[x] == NULL) {
			Jim_SetResultFormatted(goi->interp, "Unknown rtos type %s, try one of ", cp);
			for (x = 0 ; rtos_types[x] ; x++) {
				if (rtos_types[x + 1]) {
					Jim_AppendStrings(goi->interp,
									   Jim_GetResult(goi->interp),
									   rtos_types[x]->name,
									   ", ", NULL);
				} else {
					Jim_AppendStrings(goi->interp,
									   Jim_GetResult(goi->interp),
									   " or ",
									   rtos_types[x]->name,NULL);
				}
			}
			return JIM_ERR;
		}
	}
	/* Create it */
	target->rtos = calloc(1,sizeof(struct rtos));
	target->rtos->type = rtos_types[x];
	target->rtos->current_thread = 0;
	target->rtos->symbols = NULL;
	target->rtos->target = target;

	if ( 0 != strcmp( cp, "auto") )
	{
		target->rtos->type->create( target );
	}

	return JIM_OK;
}




int gdb_thread_packet(struct connection *connection, char *packet, int packet_size)
{
	struct target *target = get_target_from_connection(connection);

	if (strstr(packet, "qP"))
	{
		#define TAG_THREADID 1		/* Echo the thread identifier */
		#define TAG_EXISTS 2		/* Is this process defined enough to
						   fetch registers and its stack */
		#define TAG_DISPLAY 4		/* A short thing maybe to put on a window */
		#define TAG_THREADNAME 8	/* string, maps 1-to-1 with a thread is */
		#define TAG_MOREDISPLAY 16	/* Whatever the kernel wants to say about */

			// TODO: need to scanf the mode variable (or it with the tags), and the threadid

		unsigned long mode;
		threadid_t threadid = 0;
		struct thread_detail* detail;
		sscanf(packet, "qP%8lx%16" SCNx64, &mode, &threadid);


		int found = -1;

		if ((target->rtos != NULL) && (target->rtos->thread_details
				!= NULL)) {
			int thread_num;
			for (thread_num = 0; thread_num
					< target->rtos->thread_count; thread_num++) {
				if (target->rtos->thread_details[thread_num].threadid
						== threadid) {
					if (target->rtos->thread_details[thread_num].exists) {
						found = thread_num;
					}
				}
			}
		}
		if (found == -1) {
			gdb_put_packet(connection, "E01", 3); // thread not found
			return ERROR_OK;
		}

		detail = &target->rtos->thread_details[found];

		if ( detail->display_str != NULL )
		{
			mode &= TAG_DISPLAY;
		}
		if ( detail->thread_name_str != NULL )
		{
			mode &= TAG_THREADNAME;
		}
		if ( detail->extra_info_str != NULL )
		{
			mode &= TAG_MOREDISPLAY;
		}


		mode &= TAG_THREADID | TAG_EXISTS;

		char thread_str[1000];

		sprintf(thread_str, "%08lx", mode);
		sprintf(thread_str, "%016" PRIx64, threadid);


		if (mode & TAG_THREADID) {
			sprintf(thread_str, "%08" PRIx32 "10%016" PRIx64, TAG_THREADID, threadid);
		}
		if (mode & TAG_EXISTS) {
			sprintf(thread_str, "%08" PRIx32 "08%08" PRIx32, TAG_EXISTS, (detail->exists==true)?1:0);
		}
		if (mode & TAG_DISPLAY) {
			sprintf(thread_str, "%08" PRIx32 "%02x%s", TAG_DISPLAY, (unsigned char)strlen(detail->display_str), detail->display_str );
		}
		if (mode & TAG_MOREDISPLAY) {
			sprintf(thread_str, "%08" PRIx32 "%02x%s", TAG_MOREDISPLAY, (unsigned char)strlen(detail->extra_info_str), detail->extra_info_str );
		}
		if (mode & TAG_THREADNAME) {
			sprintf(thread_str, "%08" PRIx32 "%02x%s", TAG_THREADNAME, (unsigned char)strlen(detail->thread_name_str), detail->thread_name_str );
		}

		//gdb_put_packet(connection, tmpstr, sizeof(tmpstr)-1);
		gdb_put_packet(connection, thread_str, strlen(thread_str));

		//			gdb_put_packet(connection, "", 0);
		//		gdb_put_packet(connection, "OK", 2); // all threads alive
		return ERROR_OK;
	}
	else if (strstr(packet, "qThreadExtraInfo,"))
	{
		if ((target->rtos != NULL) && (target->rtos->thread_details != NULL) && (target->rtos->thread_count != 0))
		{
			threadid_t threadid = 0;
			int found = -1;
			sscanf(packet, "qThreadExtraInfo,%" SCNx64, &threadid );

			if ((target->rtos != NULL) && (target->rtos->thread_details
					!= NULL)) {
				int thread_num;
				for (thread_num = 0; thread_num
						< target->rtos->thread_count; thread_num++) {
					if (target->rtos->thread_details[thread_num].threadid
							== threadid) {
						if (target->rtos->thread_details[thread_num].exists) {
							found = thread_num;
						}
					}
				}
			}
			if (found == -1) {
				gdb_put_packet(connection, "E01", 3); // thread not found
				return ERROR_OK;
			}

			struct thread_detail* detail = &target->rtos->thread_details[found];

			int str_size = 0;
			if ( detail->display_str != NULL )
			{
				str_size += strlen(detail->display_str);
			}
			if ( detail->thread_name_str != NULL )
			{
				str_size += strlen(detail->thread_name_str);
			}
			if ( detail->extra_info_str != NULL )
			{
				str_size += strlen(detail->extra_info_str);
			}

			char * tmp_str = (char*) malloc( str_size + 7 );
			char*  tmp_str_ptr = tmp_str;

			if ( detail->display_str != NULL )
			{
				tmp_str_ptr += sprintf( tmp_str_ptr, "%s", detail->display_str );
			}
			if ( detail->thread_name_str != NULL )
			{
				if ( tmp_str_ptr != tmp_str )
				{
					tmp_str_ptr += sprintf( tmp_str_ptr, " : " );
				}
				tmp_str_ptr += sprintf( tmp_str_ptr, "%s", detail->thread_name_str );
			}
			if ( detail->extra_info_str != NULL )
			{
				if ( tmp_str_ptr != tmp_str )
				{
					tmp_str_ptr += sprintf( tmp_str_ptr, " : " );
				}
				tmp_str_ptr += sprintf( tmp_str_ptr, " : %s", detail->extra_info_str );
			}

			char * hex_str = (char*) malloc( strlen(tmp_str)*2 +1 );
			str_to_hex( hex_str, tmp_str );

			gdb_put_packet(connection, hex_str, strlen(hex_str));
			free(hex_str);
			free(tmp_str);
			return ERROR_OK;

		}
		gdb_put_packet(connection, "", 0);
		return ERROR_OK;
	}
	else if (strstr(packet, "qSymbol"))
	{
		if ( target->rtos != NULL )
		{
			int next_symbol_num = -1;
			if (target->rtos->symbols == NULL)
			{
				target->rtos->type->get_symbol_list_to_lookup( &target->rtos->symbols );
			}
			if (0 == strcmp( "qSymbol::", packet ) )
			{
				// first query -
				next_symbol_num = 0;
			}
			else
			{
				int64_t value = 0;
				char * hex_name_str = malloc( strlen(packet));
				char * name_str;
				int symbol_num;

				char* found = strstr( packet, "qSymbol::" );
				if (0 == found )
				{
					sscanf(packet, "qSymbol:%" SCNx64 ":%s", &value, hex_name_str);
				}
				else
				{
					// No value returned by GDB - symbol was not found
					sscanf(packet, "qSymbol::%s", hex_name_str);
				}
				name_str = (char*) malloc( 1+ strlen(hex_name_str) / 2 );

				hex_to_str( name_str, hex_name_str );


				symbol_num = 0;
				while ( ( target->rtos->symbols[ symbol_num ].symbol_name != NULL ) && ( 0 != strcmp( target->rtos->symbols[ symbol_num ].symbol_name, name_str ) ) )
				{
					symbol_num++;
				}


				if ( target->rtos->symbols[ symbol_num ].symbol_name == NULL )
				{
					LOG_OUTPUT("ERROR: unknown symbol\r\n");
					gdb_put_packet(connection, "OK", 2);
					return ERROR_OK;
				}

				target->rtos->symbols[ symbol_num ].address = value;

				next_symbol_num = symbol_num+1;
				free( hex_name_str );
				free( name_str );

			}

			int symbols_done = 0;
			if ( target->rtos->symbols[ next_symbol_num ].symbol_name == NULL )
			{
				if ( ( target->rtos_auto_detect == false ) ||
					 ( 1 == target->rtos->type->detect_rtos( target ) ) )
				{
					// Found correct RTOS or not autodetecting
					if ( target->rtos_auto_detect == true )
					{
						LOG_OUTPUT( "Auto-detected RTOS: %s\r\n",target->rtos->type->name );
					}
					symbols_done = 1;
				}
				else
				{
					// Auto detecting RTOS and currently not found
					if( 1 != rtos_try_next( target ) )
					{
						// No more RTOS's to try
						symbols_done = 1;
					}
					else
					{
						next_symbol_num = 0;
						target->rtos->type->get_symbol_list_to_lookup( &target->rtos->symbols );
					}

				}
			}


			if ( symbols_done == 1 )
			{
				target->rtos_auto_detect = false;
				target->rtos->type->create( target );
				target->rtos->type->update_threads(target->rtos);
				// No more symbols needed
				gdb_put_packet(connection, "OK", 2);
				return ERROR_OK;

			}
			else
			{
				char* symname = target->rtos->symbols[ next_symbol_num ].symbol_name;
				char qsymstr[] = "qSymbol:";
				char * opstring = (char*)malloc(sizeof(qsymstr)+strlen(symname)*2+1);
				char * posptr = opstring;
				posptr += sprintf( posptr, "%s", qsymstr );
				str_to_hex( posptr, symname );
				gdb_put_packet(connection, opstring, strlen(opstring));
				free(opstring);
				return ERROR_OK;
			}

		}
		gdb_put_packet(connection, "OK", 2);
		return ERROR_OK;
	}
	else if (strstr(packet, "qfThreadInfo"))
	{
		int i;
		if ( ( target->rtos != NULL ) && ( target->rtos->thread_count != 0 ) )
		{

			char* out_str = (char*) malloc(17 * target->rtos->thread_count + 5);
			char* tmp_str = out_str;
			tmp_str += sprintf(tmp_str, "m");
			for (i = 0; i < target->rtos->thread_count; i++) {
				if (i != 0) {
					tmp_str += sprintf(tmp_str, ",");
				}
				tmp_str += sprintf(tmp_str, "%016" PRIx64,
						target->rtos->thread_details[i].threadid);
			}
			tmp_str[0] = 0;
			gdb_put_packet(connection, out_str, strlen(out_str));
		}
		else
		{
			gdb_put_packet(connection, "", 0);
		}

		return ERROR_OK;
	}
	else if (strstr(packet, "qsThreadInfo"))
	{
		gdb_put_packet(connection, "l", 1);
		return ERROR_OK;
	}
	else if (strstr(packet, "qAttached"))
	{
		gdb_put_packet(connection, "1", 1);
		return ERROR_OK;
	}
	else if (strstr(packet, "qOffsets"))
	{
		char offsets[] = "Text=0;Data=0;Bss=0";
		gdb_put_packet(connection, offsets, sizeof(offsets)-1);
		return ERROR_OK;
	}
	else if (strstr(packet, "qC"))
	{
		if( target->rtos!=NULL )
		{
			char buffer[15];
			int size;
			size = snprintf(buffer, 15, "QC%08X", (int)target->rtos->current_thread);
			gdb_put_packet(connection, buffer, size);
		}
		else
		{
			gdb_put_packet(connection, "QC0", 3);
		}
		return ERROR_OK;
	}
	else if ( packet[0] == 'T' ) // Is thread alive?
	{
		threadid_t threadid;
		int found = -1;
		sscanf(packet, "T%" SCNx64, &threadid);
		if ((target->rtos != NULL) && (target->rtos->thread_details
				!= NULL)) {
			int thread_num;
			for (thread_num = 0; thread_num
					< target->rtos->thread_count; thread_num++) {
				if (target->rtos->thread_details[thread_num].threadid
						== threadid) {
					if (target->rtos->thread_details[thread_num].exists) {
						found = thread_num;
					}
				}
			}
		}
		if (found != -1) {
			gdb_put_packet(connection, "OK", 2); // thread alive
		} else {
			gdb_put_packet(connection, "E01", 3); // thread not found
		}
		return ERROR_OK;
	}
	else if ( packet[0] == 'H') // Set current thread ( 'c' for step and continue, 'g' for all other operations )
	{
		if (packet[1] == 'g')
		{
			sscanf(packet, "Hg%16" SCNx64, &current_threadid);
		}
		gdb_put_packet(connection, "OK", 2);
		return ERROR_OK;
	}

	return GDB_THREAD_PACKET_NOT_CONSUMED;
}

int rtos_get_gdb_reg_list(struct connection *connection, struct reg **reg_list[], int *reg_list_size)
{
	struct target *target = get_target_from_connection(connection);

	if ( ( target->rtos != NULL ) &&
		 ( current_threadid != -1 ) &&
		 ( current_threadid != 0 ) &&
		 ( current_threadid != target->rtos->current_thread ) )
	{
		char * hex_reg_list;
		target->rtos->type->get_thread_reg_list( target->rtos, current_threadid, &hex_reg_list );

		if ( hex_reg_list != NULL )
		{
			gdb_put_packet(connection, hex_reg_list, strlen(hex_reg_list));
			free(hex_reg_list);
			return ERROR_OK;
		}
	}
	return ERROR_FAIL;
}



int rtos_generic_stack_read( struct target * target, const struct rtos_register_stacking* stacking, int64_t stack_ptr, char ** hex_reg_list )
{
	int list_size = 0;
	char * tmp_str_ptr;
	int64_t new_stack_ptr;
	int i;
	int retval;

	if ( stack_ptr == 0)
	{
		LOG_OUTPUT("Error: null stack pointer in thread\r\n");
		return -5;
	}
	// Read the stack
	uint8_t * stack_data = (uint8_t*) malloc( stacking->stack_registers_size );
	uint32_t address = stack_ptr;

	if ( stacking->stack_growth_direction == 1 )
	{
		address -=  stacking->stack_registers_size;
	}
	retval = target_read_buffer( target, address, stacking->stack_registers_size, stack_data);
	if ( retval != ERROR_OK )
	{
		LOG_OUTPUT("Error reading stack frame from FreeRTOS thread\r\n");
		return retval;
	}
/*
	LOG_OUTPUT("Stack Data :");
	for(i = 0; i < stacking->stack_registers_size; i++ )
	{
		LOG_OUTPUT("%02X",stack_data[i]);
	}
	LOG_OUTPUT("\r\n");
*/
	for( i = 0; i < stacking->num_output_registers; i++ )
	{
		list_size += stacking->register_offsets[i].width_bits/8;
	}
	*hex_reg_list = (char*)malloc( list_size*2 +1 );
	tmp_str_ptr = *hex_reg_list;
	new_stack_ptr = stack_ptr - stacking->stack_growth_direction * stacking->stack_registers_size;
	for( i = 0; i < stacking->num_output_registers; i++ )
	{
		int j;
		for ( j = 0; j < stacking->register_offsets[i].width_bits/8; j++ )
		{
			if ( stacking->register_offsets[i].offset == -1 )
			{
				tmp_str_ptr += sprintf( tmp_str_ptr, "%02x", 0 );
			}
			else if ( stacking->register_offsets[i].offset == -2 )
			{
				tmp_str_ptr += sprintf( tmp_str_ptr, "%02x", ((uint8_t*)&new_stack_ptr)[j] );
			}
			else
			{
				tmp_str_ptr += sprintf( tmp_str_ptr,"%02x", stack_data[ stacking->register_offsets[i].offset + j ] );
			}
		}
	}
//	LOG_OUTPUT("Output register string: %s\r\n", *hex_reg_list);
	return ERROR_OK;
}

int rtos_try_next( struct target * target )
{
	int x;

	if ( target->rtos == NULL )
	{
		return -1;
	}

	for (x = 0 ; rtos_types[x] ; x++) {
		if (target->rtos->type == rtos_types[x] ) {
			/* found */
			if ( rtos_types[x+1] != NULL )
			{
				target->rtos->type = rtos_types[x+1];
				if ( target->rtos->symbols != NULL )
				{
					free( target->rtos->symbols );
				}
				return 1;
			}
			else
			{
				// No more rtos types
				return 0;
			}

		}
	}
	return 0;

}

static void hex_to_str( char* dst, char * hex_src )
{
	int src_pos = 0;
	int dst_pos = 0;

	while ( hex_src[src_pos] != '\x00' )
	{
		char hex_char = hex_src[src_pos];
		char hex_digit_val = (hex_char>='a')?hex_char-'a'+10:(hex_char>='A')?hex_char-'A'+10:hex_char-'0';
		if ( 0 == (src_pos & 0x01) )
		{
			dst[dst_pos] = hex_digit_val;
			dst[dst_pos+1] = 0;
		}
		else
		{
			((unsigned char*)dst)[dst_pos] <<= 4;
			((unsigned char*)dst)[dst_pos] += hex_digit_val;
			dst_pos++;
		}
		src_pos++;
	}

}

static int str_to_hex( char* hex_dst, char* src )
{
	char * posptr = hex_dst;
	unsigned i;
	for( i = 0; i < strlen(src); i++)
	{
		posptr += sprintf( posptr, "%02x", (unsigned char)src[i] );
	}
	return (posptr-hex_dst);
}


int rtos_update_threads( struct target* target )
{
	if ((target->rtos != NULL) && (target->rtos->type != NULL))
	{
		target->rtos->type->update_threads(target->rtos);
	}
	return ERROR_OK;
}