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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994, 95, 96, 99, 2001 Ralf Baechle
* Copyright (C) 1994, 1995, 1996 Paul M. Antoine.
* Copyright (C) 1999 Silicon Graphics, Inc.
* Copyright (C) 2007 Maciej W. Rozycki
*/
#ifndef __STACKFRAME_H__
#define __STACKFRAME_H__
#include "asm.h"
#include "mipsregs.h"
/*
* Stack layout for the INT 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 PT_R0 (PTRSIZE*6) /* 0 */
#define PT_R0 (0) /* 0 */
#define PT_R1 ((PT_R0) + LONGSIZE) /* 1 */
#define PT_R2 ((PT_R1) + LONGSIZE) /* 2 */
#define PT_R3 ((PT_R2) + LONGSIZE) /* 3 */
#define PT_R4 ((PT_R3) + LONGSIZE) /* 4 */
#define PT_R5 ((PT_R4) + LONGSIZE) /* 5 */
#define PT_R6 ((PT_R5) + LONGSIZE) /* 6 */
#define PT_R7 ((PT_R6) + LONGSIZE) /* 7 */
#define PT_R8 ((PT_R7) + LONGSIZE) /* 8 */
#define PT_R9 ((PT_R8) + LONGSIZE) /* 9 */
#define PT_R10 ((PT_R9) + LONGSIZE) /* 10 */
#define PT_R11 ((PT_R10) + LONGSIZE) /* 11 */
#define PT_R12 ((PT_R11) + LONGSIZE) /* 12 */
#define PT_R13 ((PT_R12) + LONGSIZE) /* 13 */
#define PT_R14 ((PT_R13) + LONGSIZE) /* 14 */
#define PT_R15 ((PT_R14) + LONGSIZE) /* 15 */
#define PT_R16 ((PT_R15) + LONGSIZE) /* 16 */
#define PT_R17 ((PT_R16) + LONGSIZE) /* 17 */
#define PT_R18 ((PT_R17) + LONGSIZE) /* 18 */
#define PT_R19 ((PT_R18) + LONGSIZE) /* 19 */
#define PT_R20 ((PT_R19) + LONGSIZE) /* 20 */
#define PT_R21 ((PT_R20) + LONGSIZE) /* 21 */
#define PT_R22 ((PT_R21) + LONGSIZE) /* 22 */
#define PT_R23 ((PT_R22) + LONGSIZE) /* 23 */
#define PT_R24 ((PT_R23) + LONGSIZE) /* 24 */
#define PT_R25 ((PT_R24) + LONGSIZE) /* 25 */
#define PT_R26 ((PT_R25) + LONGSIZE) /* 26 */
#define PT_R27 ((PT_R26) + LONGSIZE) /* 27 */
#define PT_R28 ((PT_R27) + LONGSIZE) /* 28 */
#define PT_R29 ((PT_R28) + LONGSIZE) /* 29 */
#define PT_R30 ((PT_R29) + LONGSIZE) /* 30 */
#define PT_R31 ((PT_R30) + LONGSIZE) /* 31 */
/*
* Saved special registers
*/
#define PT_STATUS ((PT_R31) + LONGSIZE) /* 32 */
#define PT_HI ((PT_STATUS) + LONGSIZE) /* 33 */
#define PT_LO ((PT_HI) + LONGSIZE) /* 34 */
#define PT_BADVADDR ((PT_LO) + LONGSIZE) /* 35 */
#define PT_CAUSE ((PT_BADVADDR) + LONGSIZE) /* 36 */
#define PT_EPC ((PT_CAUSE) + LONGSIZE) /* 37 */
#define PT_SIZE ((((PT_EPC) + LONGSIZE) + (PTRSIZE-1)) & ~(PTRSIZE-1))
.macro SAVE_AT
.set push
.set noat
LONG_S $1, PT_R1(sp)
.set pop
.endm
.macro SAVE_TEMP
mfhi v1
LONG_S $8, PT_R8(sp)
LONG_S $9, PT_R9(sp)
LONG_S v1, PT_HI(sp)
mflo v1
LONG_S $10, PT_R10(sp)
LONG_S $11, PT_R11(sp)
LONG_S v1, PT_LO(sp)
LONG_S $12, PT_R12(sp)
LONG_S $13, PT_R13(sp)
LONG_S $14, PT_R14(sp)
LONG_S $15, PT_R15(sp)
LONG_S $24, PT_R24(sp)
.endm
.macro SAVE_STATIC
LONG_S $16, PT_R16(sp)
LONG_S $17, PT_R17(sp)
LONG_S $18, PT_R18(sp)
LONG_S $19, PT_R19(sp)
LONG_S $20, PT_R20(sp)
LONG_S $21, PT_R21(sp)
LONG_S $22, PT_R22(sp)
LONG_S $23, PT_R23(sp)
LONG_S $30, PT_R30(sp)
.endm
.macro get_saved_sp
nop
.endm
.macro SAVE_SOME
.set push
.set noat
.set reorder
move k1, sp
8: move k0, sp
PTR_SUBU sp, k1, PT_SIZE
LONG_S k0, PT_R29(sp)
LONG_S $3, PT_R3(sp)
LONG_S $0, PT_R0(sp)
mfc0 v1, CP0_STATUS
LONG_S $2, PT_R2(sp)
LONG_S v1, PT_STATUS(sp)
LONG_S $4, PT_R4(sp)
mfc0 v1, CP0_CAUSE
LONG_S $5, PT_R5(sp)
LONG_S v1, PT_CAUSE(sp)
LONG_S $6, PT_R6(sp)
MFC0 v1, CP0_EPC
LONG_S $7, PT_R7(sp)
LONG_S v1, PT_EPC(sp)
LONG_S $25, PT_R25(sp)
LONG_S $28, PT_R28(sp)
LONG_S $31, PT_R31(sp)
.set pop
.endm
.macro SAVE_ALL
SAVE_SOME
SAVE_AT
SAVE_TEMP
SAVE_STATIC
.endm
.macro RESTORE_AT
.set push
.set noat
LONG_L $1, PT_R1(sp)
.set pop
.endm
.macro RESTORE_TEMP
LONG_L $24, PT_LO(sp)
LONG_L $8, PT_R8(sp)
LONG_L $9, PT_R9(sp)
mtlo $24
LONG_L $24, PT_HI(sp)
LONG_L $10, PT_R10(sp)
LONG_L $11, PT_R11(sp)
mthi $24
LONG_L $12, PT_R12(sp)
LONG_L $13, PT_R13(sp)
LONG_L $14, PT_R14(sp)
LONG_L $15, PT_R15(sp)
LONG_L $24, PT_R24(sp)
.endm
.macro RESTORE_STATIC
LONG_L $16, PT_R16(sp)
LONG_L $17, PT_R17(sp)
LONG_L $18, PT_R18(sp)
LONG_L $19, PT_R19(sp)
LONG_L $20, PT_R20(sp)
LONG_L $21, PT_R21(sp)
LONG_L $22, PT_R22(sp)
LONG_L $23, PT_R23(sp)
LONG_L $30, PT_R30(sp)
.endm
.macro RESTORE_SOME
.set push
.set reorder
.set noat
LONG_L v0, PT_STATUS(sp)
mtc0 v0, CP0_STATUS
LONG_L v1, PT_EPC(sp)
MTC0 v1, CP0_EPC
LONG_L $31, PT_R31(sp)
LONG_L $28, PT_R28(sp)
LONG_L $25, PT_R25(sp)
LONG_L $7, PT_R7(sp)
LONG_L $6, PT_R6(sp)
LONG_L $5, PT_R5(sp)
LONG_L $4, PT_R4(sp)
LONG_L $3, PT_R3(sp)
LONG_L $2, PT_R2(sp)
.set pop
.endm
.macro RESTORE_SP_AND_RET
LONG_L sp, PT_R29(sp)
.set mips3
eret
.set mips0
.endm
.macro RESTORE_SP
LONG_L sp, PT_R29(sp)
.endm
.macro RESTORE_ALL
RESTORE_TEMP
RESTORE_STATIC
RESTORE_AT
RESTORE_SOME
RESTORE_SP
.endm
.macro RESTORE_ALL_AND_RET
RESTORE_TEMP
RESTORE_STATIC
RESTORE_AT
RESTORE_SOME
RESTORE_SP_AND_RET
.endm
#endif /* end of __STACKFRAME_H__ */
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