mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 16:41:58 +00:00
e31c243f98
Use traps 120-126 to emulate atomic cmpxchg32, xchg32, and XOR-, OR-, AND-, SUB- and ADD-to-memory operations for userspace. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
330 lines
9.8 KiB
ArmAsm
330 lines
9.8 KiB
ArmAsm
/* 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/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
|
|
# deal with virtual interrupt disablement
|
|
beq icc2,#0,__entry_kernel_external_interrupt_virtually_disabled
|
|
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
|
|
.long 0,0,0
|
|
.endr
|
|
.org TBR_TT_BREAK
|
|
bra __entry_break
|
|
.long 0,0,0
|
|
|
|
.section .trap.fixup.user
|
|
.org TBR_TT_TRAP0 >> 2
|
|
.rept 127
|
|
.long __break_step_uspace_softprog_interrupt
|
|
.endr
|
|
.org TBR_TT_BREAK >> 2
|
|
.long 0
|
|
|
|
# miscellaneous kernel mode entry points
|
|
.section .trap.kernel
|
|
.org TBR_TT_TRAP0
|
|
bra __entry_kernel_softprog_interrupt
|
|
.org TBR_TT_TRAP1
|
|
bra __entry_kernel_softprog_interrupt
|
|
|
|
# trap #2 in kernel - reenable interrupts
|
|
.org TBR_TT_TRAP2
|
|
bra __entry_kernel_external_interrupt_virtual_reenable
|
|
|
|
# miscellaneous kernel traps
|
|
.org TBR_TT_TRAP3
|
|
.rept 124
|
|
bra __entry_kernel_softprog_interrupt
|
|
.long 0,0,0
|
|
.endr
|
|
.org TBR_TT_BREAK
|
|
bra __entry_break
|
|
.long 0,0,0
|
|
|
|
.section .trap.fixup.kernel
|
|
.org TBR_TT_TRAP0 >> 2
|
|
.long __break_step_kernel_softprog_interrupt
|
|
.long __break_step_kernel_softprog_interrupt
|
|
.long __break_step_kernel_external_interrupt_virtual_reenable
|
|
.rept 124
|
|
.long __break_step_kernel_softprog_interrupt
|
|
.endr
|
|
.org TBR_TT_BREAK >> 2
|
|
.long 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 119
|
|
.long __entry_unsupported_trap
|
|
.endr
|
|
|
|
# userspace atomic op emulation, traps 120-126
|
|
.rept 7
|
|
.long __entry_atomic_op
|
|
.endr
|
|
|
|
.org TBR_TT_BREAK >> 2
|
|
.long __entry_debug_exception
|