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-rw-r--r--arch/mips/lib/genex.S224
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diff --git a/arch/mips/lib/genex.S b/arch/mips/lib/genex.S
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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)