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Diffstat (limited to 'arch/frv/kernel/entry-table.S')
| -rw-r--r-- | arch/frv/kernel/entry-table.S | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/arch/frv/kernel/entry-table.S b/arch/frv/kernel/entry-table.S new file mode 100644 index 0000000..9b9243e --- /dev/null +++ b/arch/frv/kernel/entry-table.S @@ -0,0 +1,295 @@ +/* entry-table.S: main trap vector tables and exception jump table + * + * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + */ + +#include <linux/sys.h> +#include <linux/config.h> +#include <linux/linkage.h> +#include <asm/spr-regs.h> + +############################################################################### +# +# Declare the main trap and vector tables +# +# There are six tables: +# +# (1) The trap table for debug mode +# (2) The trap table for kernel mode +# (3) The trap table for user mode +# +# The CPU jumps to an appropriate slot in the appropriate table to perform +# exception processing. We have three different tables for the three +# different CPU modes because there is no hardware differentiation between +# stack pointers for these three modes, and so we have to invent one when +# crossing mode boundaries. +# +# (4) The exception handler vector table +# +# The user and kernel trap tables use the same prologue for normal +# exception processing. The prologue then jumps to the handler in this +# table, as indexed by the exception ID from the TBR. +# +# (5) The fixup table for kernel-trap single-step +# (6) The fixup table for user-trap single-step +# +# Due to the way single-stepping works on this CPU (single-step is not +# disabled when crossing exception boundaries, only when in debug mode), +# we have to catch the single-step event in break.S and jump to the fixup +# routine pointed to by this table. +# +# The linker script places the user mode and kernel mode trap tables on to +# the same 8Kb page, so that break.S can be more efficient when performing +# single-step bypass management +# +############################################################################### + + # trap table for entry from debug mode + .section .trap.break,"ax" + .balign 256*16 + .globl __entry_breaktrap_table +__entry_breaktrap_table: + + # trap table for entry from user mode + .section .trap.user,"ax" + .balign 256*16 + .globl __entry_usertrap_table +__entry_usertrap_table: + + # trap table for entry from kernel mode + .section .trap.kernel,"ax" + .balign 256*16 + .globl __entry_kerneltrap_table +__entry_kerneltrap_table: + + # exception handler jump table + .section .trap.vector,"ax" + .balign 256*4 + .globl __entry_vector_table +__entry_vector_table: + + # trap fixup table for single-stepping in user mode + .section .trap.fixup.user,"a" + .balign 256*4 + .globl __break_usertrap_fixup_table +__break_usertrap_fixup_table: + + # trap fixup table for single-stepping in user mode + .section .trap.fixup.kernel,"a" + .balign 256*4 + .globl __break_kerneltrap_fixup_table +__break_kerneltrap_fixup_table: + + # handler declaration for a sofware or program interrupt +.macro VECTOR_SOFTPROG tbr_tt, vec + .section .trap.user + .org \tbr_tt + bra __entry_uspace_softprog_interrupt + .section .trap.fixup.user + .org \tbr_tt >> 2 + .long __break_step_uspace_softprog_interrupt + .section .trap.kernel + .org \tbr_tt + bra __entry_kernel_softprog_interrupt + .section .trap.fixup.kernel + .org \tbr_tt >> 2 + .long __break_step_kernel_softprog_interrupt + .section .trap.vector + .org \tbr_tt >> 2 + .long \vec +.endm + + # handler declaration for a maskable external interrupt +.macro VECTOR_IRQ tbr_tt, vec + .section .trap.user + .org \tbr_tt + bra __entry_uspace_external_interrupt + .section .trap.fixup.user + .org \tbr_tt >> 2 + .long __break_step_uspace_external_interrupt + .section .trap.kernel + .org \tbr_tt + bra __entry_kernel_external_interrupt + .section .trap.fixup.kernel + .org \tbr_tt >> 2 + .long __break_step_kernel_external_interrupt + .section .trap.vector + .org \tbr_tt >> 2 + .long \vec +.endm + + # handler declaration for an NMI external interrupt +.macro VECTOR_NMI tbr_tt, vec + .section .trap.user + .org \tbr_tt + break + break + break + break + .section .trap.kernel + .org \tbr_tt + break + break + break + break + .section .trap.vector + .org \tbr_tt >> 2 + .long \vec +.endm + + # handler declaration for an MMU only sofware or program interrupt +.macro VECTOR_SP_MMU tbr_tt, vec +#ifdef CONFIG_MMU + VECTOR_SOFTPROG \tbr_tt, \vec +#else + VECTOR_NMI \tbr_tt, 0 +#endif +.endm + + +############################################################################### +# +# specification of the vectors +# - note: each macro inserts code into multiple sections +# +############################################################################### + VECTOR_SP_MMU TBR_TT_INSTR_MMU_MISS, __entry_insn_mmu_miss + VECTOR_SOFTPROG TBR_TT_INSTR_ACC_ERROR, __entry_insn_access_error + VECTOR_SOFTPROG TBR_TT_INSTR_ACC_EXCEP, __entry_insn_access_exception + VECTOR_SOFTPROG TBR_TT_PRIV_INSTR, __entry_privileged_instruction + VECTOR_SOFTPROG TBR_TT_ILLEGAL_INSTR, __entry_illegal_instruction + VECTOR_SOFTPROG TBR_TT_FP_EXCEPTION, __entry_media_exception + VECTOR_SOFTPROG TBR_TT_MP_EXCEPTION, __entry_media_exception + VECTOR_SOFTPROG TBR_TT_DATA_ACC_ERROR, __entry_data_access_error + VECTOR_SP_MMU TBR_TT_DATA_MMU_MISS, __entry_data_mmu_miss + VECTOR_SOFTPROG TBR_TT_DATA_ACC_EXCEP, __entry_data_access_exception + VECTOR_SOFTPROG TBR_TT_DATA_STR_ERROR, __entry_data_store_error + VECTOR_SOFTPROG TBR_TT_DIVISION_EXCEP, __entry_division_exception + +#ifdef CONFIG_MMU + .section .trap.user + .org TBR_TT_INSTR_TLB_MISS + .globl __trap_user_insn_tlb_miss +__trap_user_insn_tlb_miss: + movsg ear0,gr28 /* faulting address */ + movsg scr0,gr31 /* get mapped PTD coverage start address */ + xor.p gr28,gr31,gr31 /* compare addresses */ + bra __entry_user_insn_tlb_miss + + .org TBR_TT_DATA_TLB_MISS + .globl __trap_user_data_tlb_miss +__trap_user_data_tlb_miss: + movsg ear0,gr28 /* faulting address */ + movsg scr1,gr31 /* get mapped PTD coverage start address */ + xor.p gr28,gr31,gr31 /* compare addresses */ + bra __entry_user_data_tlb_miss + + .section .trap.kernel + .org TBR_TT_INSTR_TLB_MISS + .globl __trap_kernel_insn_tlb_miss +__trap_kernel_insn_tlb_miss: + movsg ear0,gr29 /* faulting address */ + movsg scr0,gr31 /* get mapped PTD coverage start address */ + xor.p gr29,gr31,gr31 /* compare addresses */ + bra __entry_kernel_insn_tlb_miss + + .org TBR_TT_DATA_TLB_MISS + .globl __trap_kernel_data_tlb_miss +__trap_kernel_data_tlb_miss: + movsg ear0,gr29 /* faulting address */ + movsg scr1,gr31 /* get mapped PTD coverage start address */ + xor.p gr29,gr31,gr31 /* compare addresses */ + bra __entry_kernel_data_tlb_miss + + .section .trap.fixup.user + .org TBR_TT_INSTR_TLB_MISS >> 2 + .globl __trap_fixup_user_insn_tlb_miss +__trap_fixup_user_insn_tlb_miss: + .long __break_user_insn_tlb_miss + .org TBR_TT_DATA_TLB_MISS >> 2 + .globl __trap_fixup_user_data_tlb_miss +__trap_fixup_user_data_tlb_miss: + .long __break_user_data_tlb_miss + + .section .trap.fixup.kernel + .org TBR_TT_INSTR_TLB_MISS >> 2 + .globl __trap_fixup_kernel_insn_tlb_miss +__trap_fixup_kernel_insn_tlb_miss: + .long __break_kernel_insn_tlb_miss + .org TBR_TT_DATA_TLB_MISS >> 2 + .globl __trap_fixup_kernel_data_tlb_miss +__trap_fixup_kernel_data_tlb_miss: + .long __break_kernel_data_tlb_miss + + .section .trap.vector + .org TBR_TT_INSTR_TLB_MISS >> 2 + .long __entry_insn_mmu_fault + .org TBR_TT_DATA_TLB_MISS >> 2 + .long __entry_data_mmu_fault +#endif + + VECTOR_SP_MMU TBR_TT_DATA_DAT_EXCEP, __entry_data_dat_fault + VECTOR_NMI TBR_TT_DECREMENT_TIMER, __entry_do_NMI + VECTOR_SOFTPROG TBR_TT_COMPOUND_EXCEP, __entry_compound_exception + VECTOR_IRQ TBR_TT_INTERRUPT_1, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_2, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_3, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_4, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_5, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_6, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_7, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_8, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_9, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_10, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_11, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_12, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_13, __entry_do_IRQ + VECTOR_IRQ TBR_TT_INTERRUPT_14, __entry_do_IRQ + VECTOR_NMI TBR_TT_INTERRUPT_15, __entry_do_NMI + + # miscellaneous user mode entry points + .section .trap.user + .org TBR_TT_TRAP0 + .rept 127 + bra __entry_uspace_softprog_interrupt + bra __break_step_uspace_softprog_interrupt + .long 0,0 + .endr + .org TBR_TT_BREAK + bra __entry_break + .long 0,0,0 + + # miscellaneous kernel mode entry points + .section .trap.kernel + .org TBR_TT_TRAP0 + .rept 127 + bra __entry_kernel_softprog_interrupt + bra __break_step_kernel_softprog_interrupt + .long 0,0 + .endr + .org TBR_TT_BREAK + bra __entry_break + .long 0,0,0 + + # miscellaneous debug mode entry points + .section .trap.break + .org TBR_TT_BREAK + movsg bpcsr,gr30 + jmpl @(gr30,gr0) + + # miscellaneous vectors + .section .trap.vector + .org TBR_TT_TRAP0 >> 2 + .long system_call + .rept 126 + .long __entry_unsupported_trap + .endr + .org TBR_TT_BREAK >> 2 + .long __entry_debug_exception |