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+/* 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