| // SPDX-License-Identifier: GPL-2.0 |
| // Copyright (C) 2005-2017 Andes Technology Corporation |
| |
| #include <linux/linkage.h> |
| #include <asm/memory.h> |
| #include <asm/nds32.h> |
| #include <asm/errno.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/page.h> |
| |
| #ifdef CONFIG_HWZOL |
| .macro push_zol |
| mfusr $r14, $LB |
| mfusr $r15, $LE |
| mfusr $r16, $LC |
| .endm |
| #endif |
| |
| .macro save_user_regs |
| |
| smw.adm $sp, [$sp], $sp, #0x1 |
| /* move $SP to the bottom of pt_regs */ |
| addi $sp, $sp, -OSP_OFFSET |
| |
| /* push $r0 ~ $r25 */ |
| smw.bim $r0, [$sp], $r25 |
| /* push $fp, $gp, $lp */ |
| smw.bim $sp, [$sp], $sp, #0xe |
| |
| mfsr $r12, $SP_USR |
| mfsr $r13, $IPC |
| #ifdef CONFIG_HWZOL |
| push_zol |
| #endif |
| movi $r17, -1 |
| move $r18, $r0 |
| mfsr $r19, $PSW |
| mfsr $r20, $IPSW |
| mfsr $r21, $P_IPSW |
| mfsr $r22, $P_IPC |
| mfsr $r23, $P_P0 |
| mfsr $r24, $P_P1 |
| smw.bim $r12, [$sp], $r24, #0 |
| addi $sp, $sp, -FUCOP_CTL_OFFSET |
| |
| /* Initialize kernel space $fp */ |
| andi $p0, $r20, #PSW_mskPOM |
| movi $p1, #0x0 |
| cmovz $fp, $p1, $p0 |
| |
| andi $r16, $r19, #PSW_mskINTL |
| slti $r17, $r16, #4 |
| bnez $r17, 1f |
| addi $r17, $r19, #-2 |
| mtsr $r17, $PSW |
| isb |
| 1: |
| /* If it was superuser mode, we don't need to update $r25 */ |
| bnez $p0, 2f |
| la $p0, __entry_task |
| lw $r25, [$p0] |
| 2: |
| .endm |
| |
| .text |
| |
| /* |
| * Exception Vector |
| */ |
| exception_handlers: |
| .long unhandled_exceptions !Reset/NMI |
| .long unhandled_exceptions !TLB fill |
| .long do_page_fault !PTE not present |
| .long do_dispatch_tlb_misc !TLB misc |
| .long unhandled_exceptions !TLB VLPT |
| .long unhandled_exceptions !Machine Error |
| .long do_debug_trap !Debug related |
| .long do_dispatch_general !General exception |
| .long eh_syscall !Syscall |
| .long asm_do_IRQ !IRQ |
| |
| common_exception_handler: |
| save_user_regs |
| mfsr $p0, $ITYPE |
| andi $p0, $p0, #ITYPE_mskVECTOR |
| srli $p0, $p0, #ITYPE_offVECTOR |
| andi $p1, $p0, #NDS32_VECTOR_mskNONEXCEPTION |
| bnez $p1, 1f |
| sethi $lp, hi20(ret_from_exception) |
| ori $lp, $lp, lo12(ret_from_exception) |
| sethi $p1, hi20(exception_handlers) |
| ori $p1, $p1, lo12(exception_handlers) |
| lw $p1, [$p1+$p0<<2] |
| move $r0, $p0 |
| mfsr $r1, $EVA |
| mfsr $r2, $ITYPE |
| move $r3, $sp |
| mfsr $r4, $OIPC |
| /* enable gie if it is enabled in IPSW. */ |
| mfsr $r21, $PSW |
| andi $r20, $r20, #PSW_mskGIE /* r20 is $IPSW*/ |
| or $r21, $r21, $r20 |
| mtsr $r21, $PSW |
| dsb |
| jr $p1 |
| |
| /* syscall */ |
| 1: |
| addi $p1, $p0, #-NDS32_VECTOR_offEXCEPTION |
| bnez $p1, 2f |
| sethi $lp, hi20(ret_from_exception) |
| ori $lp, $lp, lo12(ret_from_exception) |
| sethi $p1, hi20(exception_handlers) |
| ori $p1, $p1, lo12(exception_handlers) |
| lwi $p1, [$p1+#NDS32_VECTOR_offEXCEPTION<<2] |
| jr $p1 |
| |
| /* interrupt */ |
| 2: |
| #ifdef CONFIG_TRACE_IRQFLAGS |
| jal trace_hardirqs_off |
| #endif |
| move $r0, $sp |
| sethi $lp, hi20(ret_from_intr) |
| ori $lp, $lp, lo12(ret_from_intr) |
| sethi $p0, hi20(exception_handlers) |
| ori $p0, $p0, lo12(exception_handlers) |
| lwi $p0, [$p0+#NDS32_VECTOR_offINTERRUPT<<2] |
| jr $p0 |
| |
| .macro EXCEPTION_VECTOR_DEBUG |
| .align 4 |
| mfsr $p0, $EDM_CTL |
| andi $p0, $p0, EDM_CTL_mskV3_EDM_MODE |
| tnez $p0, SWID_RAISE_INTERRUPT_LEVEL |
| .endm |
| |
| .macro EXCEPTION_VECTOR |
| .align 4 |
| sethi $p0, hi20(common_exception_handler) |
| ori $p0, $p0, lo12(common_exception_handler) |
| jral.ton $p0, $p0 |
| .endm |
| |
| .section ".text.init", #alloc, #execinstr |
| .global exception_vector |
| exception_vector: |
| .rept 6 |
| EXCEPTION_VECTOR |
| .endr |
| EXCEPTION_VECTOR_DEBUG |
| .rept 121 |
| EXCEPTION_VECTOR |
| .endr |
| .align 4 |
| .global exception_vector_end |
| exception_vector_end: |
