494 lines
8.5 KiB
ArmAsm
494 lines
8.5 KiB
ArmAsm
/*
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* arch/score/kernel/entry.S
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*
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* Score Processor version.
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*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Chen Liqin <liqin.chen@sunplusct.com>
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* Lennox Wu <lennox.wu@sunplusct.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <asm/asmmacro.h>
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#include <asm/thread_info.h>
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#include <asm/unistd.h>
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/*
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* disable interrupts.
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*/
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.macro disable_irq
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mfcr r8, cr0
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srli r8, r8, 1
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slli r8, r8, 1
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mtcr r8, cr0
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nop
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nop
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nop
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nop
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nop
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.endm
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/*
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* enable interrupts.
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*/
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.macro enable_irq
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mfcr r8, cr0
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ori r8, 1
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mtcr r8, cr0
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nop
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nop
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nop
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nop
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nop
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.endm
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__INIT
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ENTRY(debug_exception_vector)
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nop!
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nop!
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nop!
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nop!
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nop!
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nop!
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nop!
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nop!
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ENTRY(general_exception_vector) # should move to addr 0x200
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j general_exception
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nop!
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nop!
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nop!
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nop!
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nop!
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nop!
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ENTRY(interrupt_exception_vector) # should move to addr 0x210
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j interrupt_exception
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nop!
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nop!
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nop!
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nop!
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nop!
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nop!
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.section ".text", "ax"
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.align 2;
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general_exception:
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mfcr r31, cr2
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nop
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la r30, exception_handlers
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andi r31, 0x1f # get ecr.exc_code
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slli r31, r31, 2
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add r30, r30, r31
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lw r30, [r30]
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br r30
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interrupt_exception:
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SAVE_ALL
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mfcr r4, cr2
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nop
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lw r16, [r28, TI_REGS]
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sw r0, [r28, TI_REGS]
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la r3, ret_from_irq
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srli r4, r4, 18 # get ecr.ip[7:2], interrupt No.
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mv r5, r0
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j do_IRQ
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ENTRY(handle_nmi) # NMI #1
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SAVE_ALL
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mv r4, r0
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la r8, nmi_exception_handler
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brl r8
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j restore_all
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ENTRY(handle_adelinsn) # AdEL-instruction #2
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SAVE_ALL
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mfcr r8, cr6
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nop
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nop
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sw r8, [r0, PT_EMA]
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mv r4, r0
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la r8, do_adelinsn
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brl r8
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mv r4, r0
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j ret_from_exception
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nop
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ENTRY(handle_ibe) # BusEL-instruction #5
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SAVE_ALL
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mv r4, r0
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la r8, do_be
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brl r8
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mv r4, r0
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j ret_from_exception
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nop
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ENTRY(handle_pel) # P-EL #6
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SAVE_ALL
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mv r4, r0
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la r8, do_pel
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brl r8
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mv r4, r0
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j ret_from_exception
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nop
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ENTRY(handle_ccu) # CCU #8
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SAVE_ALL
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mv r4, r0
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la r8, do_ccu
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brl r8
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mv r4, r0
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j ret_from_exception
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nop
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ENTRY(handle_ri) # RI #9
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SAVE_ALL
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mv r4, r0
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la r8, do_ri
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brl r8
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mv r4, r0
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j ret_from_exception
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nop
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ENTRY(handle_tr) # Trap #10
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SAVE_ALL
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mv r4, r0
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la r8, do_tr
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brl r8
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mv r4, r0
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j ret_from_exception
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nop
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ENTRY(handle_adedata) # AdES-instruction #12
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SAVE_ALL
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mfcr r8, cr6
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nop
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nop
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sw r8, [r0, PT_EMA]
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mv r4, r0
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la r8, do_adedata
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brl r8
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mv r4, r0
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j ret_from_exception
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nop
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ENTRY(handle_cee) # CeE #16
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SAVE_ALL
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mv r4, r0
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la r8, do_cee
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brl r8
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mv r4, r0
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j ret_from_exception
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nop
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ENTRY(handle_cpe) # CpE #17
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SAVE_ALL
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mv r4, r0
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la r8, do_cpe
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brl r8
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mv r4, r0
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j ret_from_exception
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nop
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ENTRY(handle_dbe) # BusEL-data #18
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SAVE_ALL
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mv r4, r0
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la r8, do_be
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brl r8
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mv r4, r0
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j ret_from_exception
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nop
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ENTRY(handle_reserved) # others
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SAVE_ALL
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mv r4, r0
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la r8, do_reserved
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brl r8
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mv r4, r0
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j ret_from_exception
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nop
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#ifndef CONFIG_PREEMPT
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#define resume_kernel restore_all
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#else
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#define __ret_from_irq ret_from_exception
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#endif
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.align 2
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#ifndef CONFIG_PREEMPT
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ENTRY(ret_from_exception)
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disable_irq # preempt stop
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nop
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j __ret_from_irq
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nop
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#endif
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ENTRY(ret_from_irq)
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sw r16, [r28, TI_REGS]
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ENTRY(__ret_from_irq)
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lw r8, [r0, PT_PSR] # returning to kernel mode?
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andri.c r8, r8, KU_USER
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beq resume_kernel
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resume_userspace:
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disable_irq
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lw r6, [r28, TI_FLAGS] # current->work
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li r8, _TIF_WORK_MASK
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and.c r8, r8, r6 # ignoring syscall_trace
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bne work_pending
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nop
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j restore_all
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nop
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#ifdef CONFIG_PREEMPT
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resume_kernel:
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disable_irq
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lw r8, [r28, TI_PRE_COUNT]
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cmpz.c r8
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bne restore_all
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need_resched:
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lw r8, [r28, TI_FLAGS]
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andri.c r9, r8, _TIF_NEED_RESCHED
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beq restore_all
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lw r8, [r28, PT_PSR] # Interrupts off?
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andri.c r8, r8, 1
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beq restore_all
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bl preempt_schedule_irq
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nop
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j need_resched
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nop
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#endif
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ENTRY(ret_from_kernel_thread)
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bl schedule_tail # r4=struct task_struct *prev
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nop
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mv r4, r13
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brl r12
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j syscall_exit
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ENTRY(ret_from_fork)
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bl schedule_tail # r4=struct task_struct *prev
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ENTRY(syscall_exit)
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nop
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disable_irq
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lw r6, [r28, TI_FLAGS] # current->work
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li r8, _TIF_WORK_MASK
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and.c r8, r6, r8
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bne syscall_exit_work
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ENTRY(restore_all) # restore full frame
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RESTORE_ALL_AND_RET
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work_pending:
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andri.c r8, r6, _TIF_NEED_RESCHED # r6 is preloaded with TI_FLAGS
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beq work_notifysig
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work_resched:
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bl schedule
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nop
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disable_irq
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lw r6, [r28, TI_FLAGS]
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li r8, _TIF_WORK_MASK
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and.c r8, r6, r8 # is there any work to be done
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# other than syscall tracing?
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beq restore_all
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andri.c r8, r6, _TIF_NEED_RESCHED
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bne work_resched
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work_notifysig:
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mv r4, r0
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li r5, 0
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bl do_notify_resume # r6 already loaded
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nop
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j resume_userspace
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nop
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ENTRY(syscall_exit_work)
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li r8, _TIF_SYSCALL_TRACE
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and.c r8, r8, r6 # r6 is preloaded with TI_FLAGS
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beq work_pending # trace bit set?
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nop
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enable_irq
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mv r4, r0
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li r5, 1
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bl do_syscall_trace
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nop
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b resume_userspace
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nop
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.macro save_context reg
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sw r12, [\reg, THREAD_REG12];
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sw r13, [\reg, THREAD_REG13];
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sw r14, [\reg, THREAD_REG14];
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sw r15, [\reg, THREAD_REG15];
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sw r16, [\reg, THREAD_REG16];
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sw r17, [\reg, THREAD_REG17];
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sw r18, [\reg, THREAD_REG18];
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sw r19, [\reg, THREAD_REG19];
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sw r20, [\reg, THREAD_REG20];
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sw r21, [\reg, THREAD_REG21];
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sw r29, [\reg, THREAD_REG29];
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sw r2, [\reg, THREAD_REG2];
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sw r0, [\reg, THREAD_REG0]
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.endm
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.macro restore_context reg
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lw r12, [\reg, THREAD_REG12];
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lw r13, [\reg, THREAD_REG13];
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lw r14, [\reg, THREAD_REG14];
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lw r15, [\reg, THREAD_REG15];
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lw r16, [\reg, THREAD_REG16];
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lw r17, [\reg, THREAD_REG17];
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lw r18, [\reg, THREAD_REG18];
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lw r19, [\reg, THREAD_REG19];
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lw r20, [\reg, THREAD_REG20];
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lw r21, [\reg, THREAD_REG21];
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lw r29, [\reg, THREAD_REG29];
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lw r0, [\reg, THREAD_REG0];
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lw r2, [\reg, THREAD_REG2];
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lw r3, [\reg, THREAD_REG3]
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.endm
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/*
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* task_struct *resume(task_struct *prev, task_struct *next,
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* struct thread_info *next_ti)
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*/
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ENTRY(resume)
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mfcr r9, cr0
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nop
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nop
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sw r9, [r4, THREAD_PSR]
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save_context r4
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sw r3, [r4, THREAD_REG3]
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mv r28, r6
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restore_context r5
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mv r8, r6
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addi r8, KERNEL_STACK_SIZE
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subi r8, 32
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la r9, kernelsp;
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sw r8, [r9];
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mfcr r9, cr0
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ldis r7, 0x00ff
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nop
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and r9, r9, r7
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lw r6, [r5, THREAD_PSR]
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not r7, r7
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and r6, r6, r7
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or r6, r6, r9
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mtcr r6, cr0
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nop; nop; nop; nop; nop
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br r3
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ENTRY(handle_sys)
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SAVE_ALL
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sw r8, [r0, 16] # argument 5 from user r8
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sw r9, [r0, 20] # argument 6 from user r9
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enable_irq
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sw r4, [r0, PT_ORIG_R4] #for restart syscall
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sw r7, [r0, PT_ORIG_R7] #for restart syscall
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sw r27, [r0, PT_IS_SYSCALL] # it from syscall
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lw r9, [r0, PT_EPC] # skip syscall on return
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addi r9, 4
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sw r9, [r0, PT_EPC]
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cmpi.c r27, __NR_syscalls # check syscall number
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bcs illegal_syscall
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slli r8, r27, 2 # get syscall routine
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la r11, sys_call_table
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add r11, r11, r8
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lw r10, [r11] # get syscall entry
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cmpz.c r10
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beq illegal_syscall
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lw r8, [r28, TI_FLAGS]
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li r9, _TIF_SYSCALL_TRACE
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and.c r8, r8, r9
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bne syscall_trace_entry
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brl r10 # Do The Real system call
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cmpi.c r4, 0
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blt 1f
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ldi r8, 0
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sw r8, [r0, PT_R7]
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b 2f
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1:
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cmpi.c r4, -MAX_ERRNO - 1
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ble 2f
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ldi r8, 0x1;
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sw r8, [r0, PT_R7]
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neg r4, r4
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2:
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sw r4, [r0, PT_R4] # save result
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syscall_return:
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disable_irq
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lw r6, [r28, TI_FLAGS] # current->work
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li r8, _TIF_WORK_MASK
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and.c r8, r6, r8
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bne syscall_return_work
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j restore_all
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syscall_return_work:
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j syscall_exit_work
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syscall_trace_entry:
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mv r16, r10
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mv r4, r0
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li r5, 0
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bl do_syscall_trace
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mv r8, r16
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lw r4, [r0, PT_R4] # Restore argument registers
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lw r5, [r0, PT_R5]
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lw r6, [r0, PT_R6]
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lw r7, [r0, PT_R7]
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brl r8
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li r8, -MAX_ERRNO - 1
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sw r8, [r0, PT_R7] # set error flag
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neg r4, r4 # error
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sw r4, [r0, PT_R0] # set flag for syscall
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# restarting
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1: sw r4, [r0, PT_R2] # result
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j syscall_exit
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illegal_syscall:
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ldi r4, -ENOSYS # error
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sw r4, [r0, PT_ORIG_R4]
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sw r4, [r0, PT_R4]
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ldi r9, 1 # set error flag
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sw r9, [r0, PT_R7]
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j syscall_return
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ENTRY(sys_rt_sigreturn)
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mv r4, r0
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la r8, score_rt_sigreturn
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br r8
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