/*
 * File      : cpu.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2010, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2010-05-17     swkyer       first version
 */
#ifndef __EXCEPTION_H__
#define __EXCEPTION_H__


/*
 * important register numbers
 */
#define REG_EPC				37
#define REG_FP				72
#define REG_SP				29

/*
 * Stack layout for the GDB exception handler
 * Derived from the stack layout described in asm-mips/stackframe.h
 *
 * The first PTRSIZE*6 bytes are argument save space for C subroutines.
 */
#define NUMREGS				90

#define GDB_FR_REG0			(PTRSIZE*6)			/* 0 */
#define GDB_FR_REG1			((GDB_FR_REG0) + LONGSIZE)	/* 1 */
#define GDB_FR_REG2			((GDB_FR_REG1) + LONGSIZE)	/* 2 */
#define GDB_FR_REG3			((GDB_FR_REG2) + LONGSIZE)	/* 3 */
#define GDB_FR_REG4			((GDB_FR_REG3) + LONGSIZE)	/* 4 */
#define GDB_FR_REG5			((GDB_FR_REG4) + LONGSIZE)	/* 5 */
#define GDB_FR_REG6			((GDB_FR_REG5) + LONGSIZE)	/* 6 */
#define GDB_FR_REG7			((GDB_FR_REG6) + LONGSIZE)	/* 7 */
#define GDB_FR_REG8			((GDB_FR_REG7) + LONGSIZE)	/* 8 */
#define GDB_FR_REG9	        ((GDB_FR_REG8) + LONGSIZE)	/* 9 */
#define GDB_FR_REG10		((GDB_FR_REG9) + LONGSIZE)	/* 10 */
#define GDB_FR_REG11		((GDB_FR_REG10) + LONGSIZE)	/* 11 */
#define GDB_FR_REG12		((GDB_FR_REG11) + LONGSIZE)	/* 12 */
#define GDB_FR_REG13		((GDB_FR_REG12) + LONGSIZE)	/* 13 */
#define GDB_FR_REG14		((GDB_FR_REG13) + LONGSIZE)	/* 14 */
#define GDB_FR_REG15		((GDB_FR_REG14) + LONGSIZE)	/* 15 */
#define GDB_FR_REG16		((GDB_FR_REG15) + LONGSIZE)	/* 16 */
#define GDB_FR_REG17		((GDB_FR_REG16) + LONGSIZE)	/* 17 */
#define GDB_FR_REG18		((GDB_FR_REG17) + LONGSIZE)	/* 18 */
#define GDB_FR_REG19		((GDB_FR_REG18) + LONGSIZE)	/* 19 */
#define GDB_FR_REG20		((GDB_FR_REG19) + LONGSIZE)	/* 20 */
#define GDB_FR_REG21		((GDB_FR_REG20) + LONGSIZE)	/* 21 */
#define GDB_FR_REG22		((GDB_FR_REG21) + LONGSIZE)	/* 22 */
#define GDB_FR_REG23		((GDB_FR_REG22) + LONGSIZE)	/* 23 */
#define GDB_FR_REG24		((GDB_FR_REG23) + LONGSIZE)	/* 24 */
#define GDB_FR_REG25		((GDB_FR_REG24) + LONGSIZE)	/* 25 */
#define GDB_FR_REG26		((GDB_FR_REG25) + LONGSIZE)	/* 26 */
#define GDB_FR_REG27		((GDB_FR_REG26) + LONGSIZE)	/* 27 */
#define GDB_FR_REG28		((GDB_FR_REG27) + LONGSIZE)	/* 28 */
#define GDB_FR_REG29		((GDB_FR_REG28) + LONGSIZE)	/* 29 */
#define GDB_FR_REG30		((GDB_FR_REG29) + LONGSIZE)	/* 30 */
#define GDB_FR_REG31		((GDB_FR_REG30) + LONGSIZE)	/* 31 */

/*
 * Saved special registers
 */
#define GDB_FR_STATUS		((GDB_FR_REG31) + LONGSIZE)	/* 32 */
#define GDB_FR_LO			((GDB_FR_STATUS) + LONGSIZE)	/* 33 */
#define GDB_FR_HI			((GDB_FR_LO) + LONGSIZE)	/* 34 */
#define GDB_FR_BADVADDR		((GDB_FR_HI) + LONGSIZE)	/* 35 */
#define GDB_FR_CAUSE		((GDB_FR_BADVADDR) + LONGSIZE)	/* 36 */
#define GDB_FR_EPC			((GDB_FR_CAUSE) + LONGSIZE)	/* 37 */

///*
// * Saved floating point registers
// */
//#define GDB_FR_FPR0		((GDB_FR_EPC) + LONGSIZE)	/* 38 */
//#define GDB_FR_FPR1		((GDB_FR_FPR0) + LONGSIZE)	/* 39 */
//#define GDB_FR_FPR2		((GDB_FR_FPR1) + LONGSIZE)	/* 40 */
//#define GDB_FR_FPR3		((GDB_FR_FPR2) + LONGSIZE)	/* 41 */
//#define GDB_FR_FPR4		((GDB_FR_FPR3) + LONGSIZE)	/* 42 */
//#define GDB_FR_FPR5		((GDB_FR_FPR4) + LONGSIZE)	/* 43 */
//#define GDB_FR_FPR6		((GDB_FR_FPR5) + LONGSIZE)	/* 44 */
//#define GDB_FR_FPR7		((GDB_FR_FPR6) + LONGSIZE)	/* 45 */
//#define GDB_FR_FPR8		((GDB_FR_FPR7) + LONGSIZE)	/* 46 */
//#define GDB_FR_FPR9		((GDB_FR_FPR8) + LONGSIZE)	/* 47 */
//#define GDB_FR_FPR10		((GDB_FR_FPR9) + LONGSIZE)	/* 48 */
//#define GDB_FR_FPR11		((GDB_FR_FPR10) + LONGSIZE)	/* 49 */
//#define GDB_FR_FPR12		((GDB_FR_FPR11) + LONGSIZE)	/* 50 */
//#define GDB_FR_FPR13		((GDB_FR_FPR12) + LONGSIZE)	/* 51 */
//#define GDB_FR_FPR14		((GDB_FR_FPR13) + LONGSIZE)	/* 52 */
//#define GDB_FR_FPR15		((GDB_FR_FPR14) + LONGSIZE)	/* 53 */
//#define GDB_FR_FPR16		((GDB_FR_FPR15) + LONGSIZE)	/* 54 */
//#define GDB_FR_FPR17		((GDB_FR_FPR16) + LONGSIZE)	/* 55 */
//#define GDB_FR_FPR18		((GDB_FR_FPR17) + LONGSIZE)	/* 56 */
//#define GDB_FR_FPR19		((GDB_FR_FPR18) + LONGSIZE)	/* 57 */
//#define GDB_FR_FPR20		((GDB_FR_FPR19) + LONGSIZE)	/* 58 */
//#define GDB_FR_FPR21		((GDB_FR_FPR20) + LONGSIZE)	/* 59 */
//#define GDB_FR_FPR22		((GDB_FR_FPR21) + LONGSIZE)	/* 60 */
//#define GDB_FR_FPR23		((GDB_FR_FPR22) + LONGSIZE)	/* 61 */
//#define GDB_FR_FPR24		((GDB_FR_FPR23) + LONGSIZE)	/* 62 */
//#define GDB_FR_FPR25		((GDB_FR_FPR24) + LONGSIZE)	/* 63 */
//#define GDB_FR_FPR26		((GDB_FR_FPR25) + LONGSIZE)	/* 64 */
//#define GDB_FR_FPR27		((GDB_FR_FPR26) + LONGSIZE)	/* 65 */
//#define GDB_FR_FPR28		((GDB_FR_FPR27) + LONGSIZE)	/* 66 */
//#define GDB_FR_FPR29		((GDB_FR_FPR28) + LONGSIZE)	/* 67 */
//#define GDB_FR_FPR30		((GDB_FR_FPR29) + LONGSIZE)	/* 68 */
//#define GDB_FR_FPR31		((GDB_FR_FPR30) + LONGSIZE)	/* 69 */
//
//#define GDB_FR_FSR		((GDB_FR_FPR31) + LONGSIZE)	/* 70 */
//#define GDB_FR_FIR		((GDB_FR_FSR) + LONGSIZE)	/* 71 */
//#define GDB_FR_FRP		((GDB_FR_FIR) + LONGSIZE)	/* 72 */
//
//#define GDB_FR_DUMMY		((GDB_FR_FRP) + LONGSIZE)	/* 73, unused ??? */
//
///*
// * Again, CP0 registers
// */
//#define GDB_FR_CP0_INDEX	((GDB_FR_DUMMY) + LONGSIZE)	/* 74 */
#define GDB_FR_FRP			((GDB_FR_EPC) + LONGSIZE)	/* 72 */
#define GDB_FR_CP0_INDEX	((GDB_FR_FRP) + LONGSIZE)	/* 74 */

#define GDB_FR_CP0_RANDOM	((GDB_FR_CP0_INDEX) + LONGSIZE)	/* 75 */
#define GDB_FR_CP0_ENTRYLO0	((GDB_FR_CP0_RANDOM) + LONGSIZE)/* 76 */
#define GDB_FR_CP0_ENTRYLO1	((GDB_FR_CP0_ENTRYLO0) + LONGSIZE)/* 77 */
#define GDB_FR_CP0_CONTEXT	((GDB_FR_CP0_ENTRYLO1) + LONGSIZE)/* 78 */
#define GDB_FR_CP0_PAGEMASK	((GDB_FR_CP0_CONTEXT) + LONGSIZE)/* 79 */
#define GDB_FR_CP0_WIRED	((GDB_FR_CP0_PAGEMASK) + LONGSIZE)/* 80 */
#define GDB_FR_CP0_REG7		((GDB_FR_CP0_WIRED) + LONGSIZE)	/* 81 */
#define GDB_FR_CP0_REG8		((GDB_FR_CP0_REG7) + LONGSIZE)	/* 82 */
#define GDB_FR_CP0_REG9		((GDB_FR_CP0_REG8) + LONGSIZE)	/* 83 */
#define GDB_FR_CP0_ENTRYHI	((GDB_FR_CP0_REG9) + LONGSIZE)	/* 84 */
#define GDB_FR_CP0_REG11	((GDB_FR_CP0_ENTRYHI) + LONGSIZE)/* 85 */
#define GDB_FR_CP0_REG12	((GDB_FR_CP0_REG11) + LONGSIZE)	/* 86 */
#define GDB_FR_CP0_REG13	((GDB_FR_CP0_REG12) + LONGSIZE)	/* 87 */
#define GDB_FR_CP0_REG14	((GDB_FR_CP0_REG13) + LONGSIZE)	/* 88 */
#define GDB_FR_CP0_PRID		((GDB_FR_CP0_REG14) + LONGSIZE)	/* 89 */

#define GDB_FR_SIZE			((((GDB_FR_CP0_PRID) + LONGSIZE) + (PTRSIZE-1)) & ~(PTRSIZE-1))

/*
 * This is the same as above, but for the high-level
 * part of the INT stub.
 */
typedef struct pt_regs_s
{
	/* Saved main processor registers. */
	rt_base_t regs[32];
	/* Saved special registers. */
	rt_base_t cp0_status;
	rt_base_t hi;
	rt_base_t lo;
	rt_base_t cp0_badvaddr;
	rt_base_t cp0_cause;
	rt_base_t cp0_epc;
} pt_regs_t;

typedef void (* exception_func_t)(pt_regs_t *regs);

extern exception_func_t sys_exception_handlers[];
exception_func_t rt_set_except_vector(int n, exception_func_t func);
void install_default_execpt_handle(void);

#endif /* end of __EXCEPTION_H__ */