421 lines
9.7 KiB
ArmAsm
421 lines
9.7 KiB
ArmAsm
/* $NetBSD: exception.S,v 1.6 2002/08/15 01:37:02 briggs Exp $ */
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/*
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* Copyright (c) 1994-1997 Mark Brinicombe.
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* Copyright (c) 1994 Brini.
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* All rights reserved.
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*
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* This code is derived from software written for Brini by Mark Brinicombe
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Brini.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* RiscBSD kernel project
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*
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* exception.S
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*
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* Low level handlers for exception vectors
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*
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* Created : 24/09/94
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*
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* Based on kate/display/abort.s
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*/
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#include "opt_ipkdb.h"
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#include <machine/asm.h>
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#include <machine/cpu.h>
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#include <machine/frame.h>
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#include "assym.h"
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.text
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.align 0
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Lastpending:
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.word _C_LABEL(astpending)
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/*
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* General exception exit handler
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*
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* It exits straight away if not returning to USR mode.
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* This loops around delivering any pending ASTs.
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* Interrupts are disabled at suitable points to avoid ASTs
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* being posted between testing and exit to user mode.
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*
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* This function uses PULLFRAMEFROMSVCANDEXIT thus should
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* only be called if the exception handler used PUSHFRAMEINSVC
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*/
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exception_exit:
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mrs r4, cpsr /* Get CPSR */
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ldr r0, [sp] /* Get the SPSR from stack */
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and r0, r0, #(PSR_MODE) /* Test for USR32 mode before the AST */
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teq r0, #(PSR_USR32_MODE)
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bne .Ldo_exit /* Not USR mode so no AST delivery */
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ldr r5, Lastpending /* Get address of astpending */
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Lexception_exit_loop:
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orr r0, r4, #(I32_bit) /* Block IRQs */
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msr cpsr_all, r0
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ldr r1, [r5] /* Do we have an AST pending */
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teq r1, #0x00000000
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bne .Ldo_ast
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PULLFRAMEFROMSVCANDEXIT /* No AST so exit */
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.Ldo_ast:
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mov r1, #0x00000000 /* Clear ast pending */
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str r1, [r5]
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msr cpsr_all, r4 /* Restore interrupts */
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mov r0, sp /* arg 0 = trap frame */
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bl _C_LABEL(ast) /* call the AST handler */
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b Lexception_exit_loop /* Try and exit again */
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.Ldo_exit:
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orr r0, r4, #(I32_bit) /* Disable interupts */
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msr cpsr_all, r0
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PULLFRAMEFROMSVCANDEXIT /* Restore the trap frame and exit */
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/*
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* reset_entry:
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*
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* Handler for Reset exception.
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*/
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ASENTRY_NP(reset_entry)
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adr r0, Lreset_panicmsg
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mov r1, lr
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bl _C_LABEL(panic)
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/* NOTREACHED */
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Lreset_panicmsg:
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.asciz "Reset vector called, LR = 0x%08x"
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.balign 4
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/*
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* swi_entry
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*
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* Handler for the Software Interrupt exception.
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*/
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ASENTRY_NP(swi_entry)
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PUSHFRAME
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mov r0, sp /* Pass the frame to any function */
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bl _C_LABEL(swi_handler) /* It's a SWI ! */
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ldr r5, Lastpending /* Get address of astpending */
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mrs r4, cpsr /* Get CPSR */
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.Lswi_exit_loop:
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orr r0, r4, #(I32_bit) /* Disable IRQs */
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msr cpsr_all, r0
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ldr r1, [r5] /* Do we have an AST pending */
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teq r1, #0x00000000
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bne .Ldo_swi_ast
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PULLFRAME
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movs pc, lr /* Exit */
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.Ldo_swi_ast:
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mov r1, #0x00000000 /* Clear ast pending */
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str r1, [r5]
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msr cpsr_all, r4 /* Restore interrupts */
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mov r0, sp /* arg 0 = trap frame */
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bl _C_LABEL(ast) /* call the AST handler */
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b .Lswi_exit_loop /* Try and exit again */
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/*
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* prefetch_abort_entry:
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*
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* Handler for the Prefetch Abort exception.
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*/
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ASENTRY_NP(prefetch_abort_entry)
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sub lr, lr, #0x00000004 /* Adjust the lr */
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PUSHFRAMEINSVC
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mov r0, sp /* pass the stack pointer as r0 */
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add lr, pc, #exception_exit - . - 8
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ldr r1, Lprefetch_abort_handler_address
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ldr pc, [r1]
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Lprefetch_abort_handler_address:
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.word _C_LABEL(prefetch_abort_handler_address)
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.data
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.global _C_LABEL(prefetch_abort_handler_address)
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_C_LABEL(prefetch_abort_handler_address):
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.word abortprefetch
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.text
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abortprefetch:
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add r0, pc, #abortprefetchmsg - . - 8
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b _C_LABEL(panic)
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abortprefetchmsg:
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.asciz "abortprefetch"
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.align 0
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/*
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* data_abort_entry:
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*
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* Handler for the Data Abort exception.
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*/
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ASENTRY_NP(data_abort_entry)
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sub lr, lr, #0x00000008 /* Adjust the lr */
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PUSHFRAMEINSVC /* Push trap frame and switch */
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/* to SVC32 mode */
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mov r0, sp /* pass the stack pointer as r0 */
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add lr, pc, #exception_exit - . - 8
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ldr r1, Ldata_abort_handler_address
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ldr pc, [r1]
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Ldata_abort_handler_address:
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.word _C_LABEL(data_abort_handler_address)
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.data
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.global _C_LABEL(data_abort_handler_address)
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_C_LABEL(data_abort_handler_address):
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.word abortdata
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.text
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abortdata:
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add r0, pc, #abortdatamsg - . - 8
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b _C_LABEL(panic)
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abortdatamsg:
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.asciz "abortdata"
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.align 0
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/*
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* address_exception_entry:
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*
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* Handler for the Address Exception exception.
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*
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* NOTE: This exception isn't really used on arm32. We
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* print a warning message to the console and then treat
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* it like a Data Abort.
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*/
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ASENTRY_NP(address_exception_entry)
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mrs r1, cpsr_all
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mrs r2, spsr_all
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mov r3, lr
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adr r0, Laddress_exception_msg
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bl _C_LABEL(printf) /* XXX CLOBBERS LR!! */
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b data_abort_entry
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Laddress_exception_msg:
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.asciz "Address Exception CPSR=0x%08x SPSR=0x%08x LR=0x%08x\n"
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.balign 4
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/*
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* undefined_entry:
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*
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* Handler for the Undefined Instruction exception.
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*
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* We indirect the undefined vector via the handler address
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* in the data area. Entry to the undefined handler must
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* look like direct entry from the vector.
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*/
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ASENTRY_NP(undefined_entry)
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#ifdef IPKDB
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/*
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* IPKDB must be hooked in at the earliest possible entry point.
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*
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*/
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/*
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* Make room for all registers saving real r0-r7 and r15.
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* The remaining registers are updated later.
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*/
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stmfd sp!, {r0,r1} /* psr & spsr */
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stmfd sp!, {lr} /* pc */
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stmfd sp!, {r0-r14} /* r0-r7, r8-r14 */
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/*
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* Get previous psr.
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*/
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mrs r7, cpsr_all
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mrs r0, spsr_all
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str r0, [sp, #(16*4)]
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/*
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* Test for user mode.
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*/
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tst r0, #0xf
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bne .Lprenotuser_push
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add r1, sp, #(8*4)
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stmia r1,{r8-r14}^ /* store user mode r8-r14*/
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b .Lgoipkdb
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/*
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* Switch to previous mode to get r8-r13.
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*/
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.Lprenotuser_push:
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orr r0, r0, #(I32_bit) /* disable interrupts */
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msr cpsr_all, r0
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mov r1, r8
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mov r2, r9
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mov r3, r10
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mov r4, r11
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mov r5, r12
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mov r6, r13
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msr cpsr_all, r7 /* back to undefined mode */
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add r8, sp, #(8*4)
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stmia r8, {r1-r6} /* r8-r13 */
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/*
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* Now back to previous mode to get r14 and spsr.
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*/
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msr cpsr_all, r0
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mov r1, r14
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mrs r2, spsr
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msr cpsr_all, r7 /* back to undefined mode */
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str r1, [sp, #(14*4)] /* r14 */
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str r2, [sp, #(17*4)] /* spsr */
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/*
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* Now to IPKDB.
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*/
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.Lgoipkdb:
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mov r0, sp
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bl _C_LABEL(ipkdb_trap_glue)
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ldr r1, .Lipkdb_trap_return
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str r0,[r1]
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/*
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* Have to load all registers from the stack.
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*
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* Start with spsr and pc.
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*/
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ldr r0, [sp, #(16*4)] /* spsr */
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ldr r1, [sp, #(15*4)] /* r15 */
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msr spsr_all, r0
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mov r14, r1
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/*
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* Test for user mode.
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*/
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tst r0, #0xf
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bne .Lprenotuser_pull
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add r1, sp, #(8*4)
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ldmia r1, {r8-r14}^ /* load user mode r8-r14 */
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b .Lpull_r0r7
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.Lprenotuser_pull:
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/*
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* Now previous mode spsr and r14.
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*/
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ldr r1, [sp, #(17*4)] /* spsr */
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ldr r2, [sp, #(14*4)] /* r14 */
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orr r0, r0, #(I32_bit)
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msr cpsr_all, r0 /* switch to previous mode */
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msr spsr_all, r1
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mov r14, r2
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msr cpsr_all, r7 /* back to undefined mode */
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/*
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* Now r8-r13.
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*/
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add r8, sp, #(8*4)
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ldmia r8, {r1-r6} /* r8-r13 */
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msr cpsr_all, r0
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mov r8, r1
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mov r9, r2
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mov r10, r3
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mov r11, r4
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mov r12, r5
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mov r13, r6
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msr cpsr_all, r7
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.Lpull_r0r7:
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/*
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* Now the rest of the registers.
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*/
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ldr r1,Lipkdb_trap_return
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ldr r0,[r1]
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tst r0,r0
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ldmfd sp!, {r0-r7} /* r0-r7 */
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add sp, sp, #(10*4) /* adjust sp */
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/*
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* Did IPKDB handle it?
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*/
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movnes pc, lr /* return */
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#endif
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stmfd sp!, {r0, r1}
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ldr r0, Lundefined_handler_indirection
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ldr r1, [sp], #0x0004
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str r1, [r0, #0x0000]
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ldr r1, [sp], #0x0004
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str r1, [r0, #0x0004]
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ldmia r0, {r0, r1, pc}
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#ifdef IPKDB
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Lipkdb_trap_return:
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.word Lipkdb_trap_return_data
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#endif
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Lundefined_handler_indirection:
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.word Lundefined_handler_indirection_data
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/*
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* assembly bounce code for calling the kernel
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* undefined instruction handler. This uses
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* a standard trap frame and is called in SVC mode.
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*/
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ENTRY_NP(undefinedinstruction_bounce)
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PUSHFRAMEINSVC
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mov r0, sp
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bl _C_LABEL(undefinedinstruction)
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b exception_exit
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.data
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.align 0
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#ifdef IPKDB
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Lipkdb_trap_return_data:
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.word 0
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#endif
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/*
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* Indirection data
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* 2 words use for preserving r0 and r1
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* 3rd word contains the undefined handler address.
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*/
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Lundefined_handler_indirection_data:
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.word 0
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.word 0
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.global _C_LABEL(undefined_handler_address)
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_C_LABEL(undefined_handler_address):
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.word _C_LABEL(undefinedinstruction_bounce)
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