/*
 * File      : arm_entry_gcc.S
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Development Team
 *
 *  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.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2014-11-07     weety    first version
 */

#include <rtconfig.h>

#include "armv6.h"

//#define DEBUG

.macro	PRINT, str
#ifdef DEBUG
	stmfd	sp!, {r0-r3, ip, lr}
	add	r0, pc, #4
	bl	rt_kprintf
	b	1f
	.asciz  "UNDEF: \str\n"
	.balign 4
1:	ldmfd	sp!, {r0-r3, ip, lr}
#endif
	.endm

.macro  PRINT1, str, arg
#ifdef DEBUG
	stmfd	sp!, {r0-r3, ip, lr}
	mov	r1, \arg
	add	r0, pc, #4
	bl	rt_kprintf
	b	1f
	.asciz  "UNDEF: \str\n"
	.balign 4
1:	ldmfd	sp!, {r0-r3, ip, lr}
#endif
	.endm

.macro  PRINT3, str, arg1, arg2, arg3
#ifdef DEBUG
	stmfd	sp!, {r0-r3, ip, lr}
	mov	r3, \arg3
	mov	r2, \arg2
	mov	r1, \arg1
	add	r0, pc, #4
	bl	rt_kprintf
	b	1f
	.asciz  "UNDEF: \str\n"
	.balign 4
1:	ldmfd	sp!, {r0-r3, ip, lr}
#endif
	.endm

.macro	get_current_thread, rd
	ldr	\rd, .current_thread
	ldr	\rd, [\rd]
	.endm

.current_thread:
	.word	rt_current_thread

#ifdef RT_USING_NEON
	.align	6

/* is the neon instuction on arm mode? */
.neon_opcode:
	.word	0xfe000000			@ mask
	.word	0xf2000000			@ opcode

	.word	0xff100000			@ mask
	.word	0xf4000000			@ opcode

	.word	0x00000000			@ end mask
	.word	0x00000000			@ end opcode
#endif

/* undefined instruction exception processing */
.globl undef_entry
undef_entry:
	PRINT1 "r0=0x%08x", r0
	PRINT1 "r2=0x%08x", r2
	PRINT1 "r9=0x%08x", r9
	PRINT1 "sp=0x%08x", sp

#ifdef RT_USING_NEON
	ldr	r6, .neon_opcode
__check_neon_instruction:
	ldr	r7, [r6], #4		@ load mask value
	cmp	r7, #0				@ end mask?
	beq	__check_vfp_instruction
	and	r8, r0, r7
	ldr	r7, [r6], #4		@ load opcode value
	cmp	r8, r7				@ is NEON instruction?
	bne	__check_neon_instruction
	b	vfp_entry
__check_vfp_instruction:
#endif
	tst	r0, #0x08000000			@ only CDP/CPRT/LDC/STC instruction has bit 27
	tstne	r0, #0x04000000		@ bit 26 set on both ARM and Thumb-2 instruction
	moveq	pc, lr				@ no vfp coprocessor instruction, return
	get_current_thread r10
	and	r8, r0, #0x00000f00		@ get coprocessor number
	PRINT1 "CP=0x%08x", r8
	add	pc, pc, r8, lsr #6
	nop
	mov pc,	lr				@ CP0
	mov pc,	lr				@ CP1
	mov pc,	lr				@ CP2
	mov pc,	lr				@ CP3
	mov pc,	lr				@ CP4
	mov pc,	lr				@ CP5
	mov pc,	lr				@ CP6
	mov pc,	lr				@ CP7
	mov pc,	lr				@ CP8
	mov pc,	lr				@ CP9
	mov pc,	lr				@ CP10 VFP
	mov pc,	lr				@ CP11 VFP
	mov pc,	lr				@ CP12
	mov pc,	lr				@ CP13
	mov pc,	lr				@ CP14 DEBUG
	mov pc,	lr				@ CP15 SYS CONTROL