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/*
* Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
* Copyright (C) 2002, 2007 Maciej W. Rozycki
* Copyright (C) 2001, 2012 MIPS Technologies, Inc. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm/asm.h>
#include <asm/regdef.h>
#include <asm/mipsregs.h>
#include <asm/asm-offsets.h>
#define STATMASK 0x1f
.set noreorder
/*
* Macros copied and adapted from Linux MIPS
*/
.macro SAVE_AT
.set push
.set noat
LONG_S $1, PT_R1(sp)
.set pop
.endm
.macro SAVE_TEMP
#if __mips_isa_rev < 6
mfhi v1
#endif
#ifdef CONFIG_32BIT
LONG_S $8, PT_R8(sp)
LONG_S $9, PT_R9(sp)
#endif
LONG_S $10, PT_R10(sp)
LONG_S $11, PT_R11(sp)
LONG_S $12, PT_R12(sp)
#if __mips_isa_rev < 6
LONG_S v1, PT_HI(sp)
mflo v1
#endif
LONG_S $13, PT_R13(sp)
LONG_S $14, PT_R14(sp)
LONG_S $15, PT_R15(sp)
LONG_S $24, PT_R24(sp)
#if __mips_isa_rev < 6
LONG_S v1, PT_LO(sp)
#endif
.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 SAVE_SOME
.set push
.set noat
PTR_SUBU k1, sp, PT_SIZE
LONG_S sp, PT_R29(k1)
move sp, k1
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)
#ifdef CONFIG_64BIT
LONG_S $8, PT_R8(sp)
LONG_S $9, PT_R9(sp)
#endif
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 RESTORE_AT
.set push
.set noat
LONG_L $1, PT_R1(sp)
.set pop
.endm
.macro RESTORE_TEMP
#if __mips_isa_rev < 6
LONG_L $24, PT_LO(sp)
mtlo $24
LONG_L $24, PT_HI(sp)
mthi $24
#endif
#ifdef CONFIG_32BIT
LONG_L $8, PT_R8(sp)
LONG_L $9, PT_R9(sp)
#endif
LONG_L $10, PT_R10(sp)
LONG_L $11, PT_R11(sp)
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
mfc0 a0, CP0_STATUS
ori a0, STATMASK
xori a0, STATMASK
mtc0 a0, CP0_STATUS
li v1, ST0_CU1 | ST0_FR | ST0_IM
and a0, v1
LONG_L v0, PT_STATUS(sp)
nor v1, $0, v1
and v0, v1
or v0, a0
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)
#ifdef CONFIG_64BIT
LONG_L $8, PT_R8(sp)
LONG_L $9, PT_R9(sp)
#endif
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
LONG_L sp, PT_R29(sp)
.endm
NESTED(except_vec3_generic, 0, sp)
PTR_LA k1, handle_reserved
jr k1
nop
END(except_vec3_generic)
NESTED(except_vec_ejtag_debug, 0, sp)
PTR_LA k1, handle_ejtag_debug
jr k1
nop
END(except_vec_ejtag_debug)
NESTED(handle_reserved, PT_SIZE, sp)
SAVE_SOME
SAVE_AT
SAVE_TEMP
SAVE_STATIC
PTR_LA t9, do_reserved
jr t9
move a0, sp
END(handle_reserved)
NESTED(handle_ejtag_debug, PT_SIZE, sp)
.set push
.set noat
MTC0 k1, CP0_DESAVE
/* Check for SDBBP */
MFC0 k1, CP0_DEBUG
sll k1, k1, 30
bgez k1, ejtag_return
nop
SAVE_SOME
SAVE_AT
SAVE_TEMP
SAVE_STATIC
PTR_LA t9, do_ejtag_debug
jalr t9
move a0, sp
RESTORE_TEMP
RESTORE_STATIC
RESTORE_AT
RESTORE_SOME
RESTORE_SP
ejtag_return:
MFC0 k1, CP0_DESAVE
deret
.set pop
END(handle_ejtag_debug)
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