| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * 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. |
| */ |
| |
| #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) |
