1164 lines
32 KiB
ArmAsm
1164 lines
32 KiB
ArmAsm
/*
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* Exception handling for Microblaze
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*
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* Rewriten interrupt handling
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*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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*
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* uClinux customisation (C) 2005 John Williams
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*
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* MMU code derived from arch/ppc/kernel/head_4xx.S:
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* Copyright (C) 1995-1996 Gary Thomas <gdt@linuxppc.org>
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* Initial PowerPC version.
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* Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
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* Rewritten for PReP
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* Copyright (C) 1996 Paul Mackerras <paulus@cs.anu.edu.au>
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* Low-level exception handers, MMU support, and rewrite.
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* Copyright (C) 1997 Dan Malek <dmalek@jlc.net>
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* PowerPC 8xx modifications.
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* Copyright (C) 1998-1999 TiVo, Inc.
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* PowerPC 403GCX modifications.
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* Copyright (C) 1999 Grant Erickson <grant@lcse.umn.edu>
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* PowerPC 403GCX/405GP modifications.
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* Copyright 2000 MontaVista Software Inc.
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* PPC405 modifications
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* PowerPC 403GCX/405GP modifications.
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* Author: MontaVista Software, Inc.
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* frank_rowand@mvista.com or source@mvista.com
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* debbie_chu@mvista.com
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*
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* Original code
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* Copyright (C) 2004 Xilinx, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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/*
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* Here are the handlers which don't require enabling translation
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* and calling other kernel code thus we can keep their design very simple
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* and do all processing in real mode. All what they need is a valid current
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* (that is an issue for the CONFIG_REGISTER_TASK_PTR case)
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* This handlers use r3,r4,r5,r6 and optionally r[current] to work therefore
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* these registers are saved/restored
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* The handlers which require translation are in entry.S --KAA
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*
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* Microblaze HW Exception Handler
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* - Non self-modifying exception handler for the following exception conditions
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* - Unalignment
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* - Instruction bus error
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* - Data bus error
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* - Illegal instruction opcode
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* - Divide-by-zero
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*
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* - Privileged instruction exception (MMU)
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* - Data storage exception (MMU)
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* - Instruction storage exception (MMU)
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* - Data TLB miss exception (MMU)
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* - Instruction TLB miss exception (MMU)
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*
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* Note we disable interrupts during exception handling, otherwise we will
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* possibly get multiple re-entrancy if interrupt handles themselves cause
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* exceptions. JW
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*/
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#include <asm/exceptions.h>
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#include <asm/unistd.h>
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#include <asm/page.h>
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#include <asm/entry.h>
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#include <asm/current.h>
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#include <linux/linkage.h>
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#include <asm/mmu.h>
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#include <asm/pgtable.h>
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#include <asm/signal.h>
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#include <asm/asm-offsets.h>
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/* Helpful Macros */
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#ifndef CONFIG_MMU
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#define EX_HANDLER_STACK_SIZ (4*19)
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#endif
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#define NUM_TO_REG(num) r ## num
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#ifdef CONFIG_MMU
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#define RESTORE_STATE \
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lwi r5, r1, 0; \
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mts rmsr, r5; \
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nop; \
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lwi r3, r1, PT_R3; \
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lwi r4, r1, PT_R4; \
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lwi r5, r1, PT_R5; \
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lwi r6, r1, PT_R6; \
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lwi r11, r1, PT_R11; \
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lwi r31, r1, PT_R31; \
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lwi r1, r0, TOPHYS(r0_ram + 0);
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#endif /* CONFIG_MMU */
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#define LWREG_NOP \
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bri ex_handler_unhandled; \
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nop;
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#define SWREG_NOP \
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bri ex_handler_unhandled; \
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nop;
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/* FIXME this is weird - for noMMU kernel is not possible to use brid
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* instruction which can shorten executed time
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*/
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/* r3 is the source */
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#define R3_TO_LWREG_V(regnum) \
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swi r3, r1, 4 * regnum; \
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bri ex_handler_done;
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/* r3 is the source */
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#define R3_TO_LWREG(regnum) \
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or NUM_TO_REG (regnum), r0, r3; \
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bri ex_handler_done;
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/* r3 is the target */
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#define SWREG_TO_R3_V(regnum) \
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lwi r3, r1, 4 * regnum; \
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bri ex_sw_tail;
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/* r3 is the target */
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#define SWREG_TO_R3(regnum) \
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or r3, r0, NUM_TO_REG (regnum); \
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bri ex_sw_tail;
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#ifdef CONFIG_MMU
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#define R3_TO_LWREG_VM_V(regnum) \
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brid ex_lw_end_vm; \
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swi r3, r7, 4 * regnum;
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#define R3_TO_LWREG_VM(regnum) \
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brid ex_lw_end_vm; \
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or NUM_TO_REG (regnum), r0, r3;
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#define SWREG_TO_R3_VM_V(regnum) \
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brid ex_sw_tail_vm; \
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lwi r3, r7, 4 * regnum;
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#define SWREG_TO_R3_VM(regnum) \
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brid ex_sw_tail_vm; \
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or r3, r0, NUM_TO_REG (regnum);
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/* Shift right instruction depending on available configuration */
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#if CONFIG_XILINX_MICROBLAZE0_USE_BARREL > 0
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#define BSRLI(rD, rA, imm) \
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bsrli rD, rA, imm
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#elif CONFIG_XILINX_MICROBLAZE0_USE_DIV > 0
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#define BSRLI(rD, rA, imm) \
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ori rD, r0, (1 << imm); \
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idivu rD, rD, rA
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#else
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#define BSRLI(rD, rA, imm) BSRLI ## imm (rD, rA)
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/* Only the used shift constants defined here - add more if needed */
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#define BSRLI2(rD, rA) \
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srl rD, rA; /* << 1 */ \
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srl rD, rD; /* << 2 */
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#define BSRLI10(rD, rA) \
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srl rD, rA; /* << 1 */ \
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srl rD, rD; /* << 2 */ \
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srl rD, rD; /* << 3 */ \
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srl rD, rD; /* << 4 */ \
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srl rD, rD; /* << 5 */ \
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srl rD, rD; /* << 6 */ \
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srl rD, rD; /* << 7 */ \
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srl rD, rD; /* << 8 */ \
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srl rD, rD; /* << 9 */ \
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srl rD, rD /* << 10 */
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#define BSRLI20(rD, rA) \
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BSRLI10(rD, rA); \
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BSRLI10(rD, rD)
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#endif
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#endif /* CONFIG_MMU */
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.extern other_exception_handler /* Defined in exception.c */
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/*
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* hw_exception_handler - Handler for exceptions
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*
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* Exception handler notes:
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* - Handles all exceptions
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* - Does not handle unaligned exceptions during load into r17, r1, r0.
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* - Does not handle unaligned exceptions during store from r17 (cannot be
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* done) and r1 (slows down common case)
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*
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* Relevant register structures
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*
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* EAR - |----|----|----|----|----|----|----|----|
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* - < ## 32 bit faulting address ## >
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*
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* ESR - |----|----|----|----|----| - | - |-----|-----|
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* - W S REG EXC
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*
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*
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* STACK FRAME STRUCTURE (for NO_MMU)
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* ---------------------------------
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*
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* +-------------+ + 0
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* | MSR |
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* +-------------+ + 4
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* | r1 |
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* | . |
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* | . |
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* | . |
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* | . |
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* | r18 |
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* +-------------+ + 76
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* | . |
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* | . |
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*
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* NO_MMU kernel use the same r0_ram pointed space - look to vmlinux.lds.S
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* which is used for storing register values - old style was, that value were
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* stored in stack but in case of failure you lost information about register.
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* Currently you can see register value in memory in specific place.
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* In compare to with previous solution the speed should be the same.
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*
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* MMU exception handler has different handling compare to no MMU kernel.
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* Exception handler use jump table for directing of what happen. For MMU kernel
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* is this approach better because MMU relate exception are handled by asm code
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* in this file. In compare to with MMU expect of unaligned exception
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* is everything handled by C code.
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*/
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/*
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* every of these handlers is entered having R3/4/5/6/11/current saved on stack
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* and clobbered so care should be taken to restore them if someone is going to
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* return from exception
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*/
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/* wrappers to restore state before coming to entry.S */
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#ifdef CONFIG_MMU
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.section .rodata
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.align 4
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_MB_HW_ExceptionVectorTable:
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/* 0 - Undefined */
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.long TOPHYS(ex_handler_unhandled)
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/* 1 - Unaligned data access exception */
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.long TOPHYS(handle_unaligned_ex)
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/* 2 - Illegal op-code exception */
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.long TOPHYS(full_exception_trapw)
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/* 3 - Instruction bus error exception */
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.long TOPHYS(full_exception_trapw)
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/* 4 - Data bus error exception */
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.long TOPHYS(full_exception_trapw)
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/* 5 - Divide by zero exception */
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.long TOPHYS(full_exception_trapw)
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/* 6 - Floating point unit exception */
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.long TOPHYS(full_exception_trapw)
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/* 7 - Privileged instruction exception */
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.long TOPHYS(full_exception_trapw)
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/* 8 - 15 - Undefined */
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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/* 16 - Data storage exception */
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.long TOPHYS(handle_data_storage_exception)
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/* 17 - Instruction storage exception */
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.long TOPHYS(handle_instruction_storage_exception)
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/* 18 - Data TLB miss exception */
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.long TOPHYS(handle_data_tlb_miss_exception)
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/* 19 - Instruction TLB miss exception */
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.long TOPHYS(handle_instruction_tlb_miss_exception)
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/* 20 - 31 - Undefined */
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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.long TOPHYS(ex_handler_unhandled)
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#endif
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.global _hw_exception_handler
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.section .text
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.align 4
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.ent _hw_exception_handler
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_hw_exception_handler:
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#ifndef CONFIG_MMU
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addik r1, r1, -(EX_HANDLER_STACK_SIZ); /* Create stack frame */
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#else
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swi r1, r0, TOPHYS(r0_ram + 0); /* GET_SP */
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/* Save date to kernel memory. Here is the problem
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* when you came from user space */
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ori r1, r0, TOPHYS(r0_ram + 28);
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#endif
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swi r3, r1, PT_R3
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swi r4, r1, PT_R4
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swi r5, r1, PT_R5
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swi r6, r1, PT_R6
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#ifdef CONFIG_MMU
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swi r11, r1, PT_R11
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swi r31, r1, PT_R31
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lwi r31, r0, TOPHYS(PER_CPU(CURRENT_SAVE)) /* get saved current */
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#endif
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mfs r5, rmsr;
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nop
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swi r5, r1, 0;
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mfs r4, resr
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nop
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mfs r3, rear;
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nop
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#ifndef CONFIG_MMU
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andi r5, r4, 0x1000; /* Check ESR[DS] */
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beqi r5, not_in_delay_slot; /* Branch if ESR[DS] not set */
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mfs r17, rbtr; /* ESR[DS] set - return address in BTR */
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nop
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not_in_delay_slot:
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swi r17, r1, PT_R17
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#endif
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andi r5, r4, 0x1F; /* Extract ESR[EXC] */
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#ifdef CONFIG_MMU
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/* Calculate exception vector offset = r5 << 2 */
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addk r6, r5, r5; /* << 1 */
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addk r6, r6, r6; /* << 2 */
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#ifdef DEBUG
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/* counting which exception happen */
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lwi r5, r0, 0x200 + TOPHYS(r0_ram)
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addi r5, r5, 1
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swi r5, r0, 0x200 + TOPHYS(r0_ram)
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lwi r5, r6, 0x200 + TOPHYS(r0_ram)
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addi r5, r5, 1
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swi r5, r6, 0x200 + TOPHYS(r0_ram)
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#endif
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/* end */
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/* Load the HW Exception vector */
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lwi r6, r6, TOPHYS(_MB_HW_ExceptionVectorTable)
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bra r6
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full_exception_trapw:
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RESTORE_STATE
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bri full_exception_trap
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#else
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/* Exceptions enabled here. This will allow nested exceptions */
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mfs r6, rmsr;
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nop
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swi r6, r1, 0; /* RMSR_OFFSET */
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ori r6, r6, 0x100; /* Turn ON the EE bit */
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andi r6, r6, ~2; /* Disable interrupts */
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mts rmsr, r6;
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nop
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xori r6, r5, 1; /* 00001 = Unaligned Exception */
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/* Jump to unalignment exception handler */
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beqi r6, handle_unaligned_ex;
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handle_other_ex: /* Handle Other exceptions here */
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/* Save other volatiles before we make procedure calls below */
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swi r7, r1, PT_R7
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swi r8, r1, PT_R8
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swi r9, r1, PT_R9
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swi r10, r1, PT_R10
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swi r11, r1, PT_R11
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swi r12, r1, PT_R12
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swi r14, r1, PT_R14
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swi r15, r1, PT_R15
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swi r18, r1, PT_R18
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or r5, r1, r0
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andi r6, r4, 0x1F; /* Load ESR[EC] */
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lwi r7, r0, PER_CPU(KM) /* MS: saving current kernel mode to regs */
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swi r7, r1, PT_MODE
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mfs r7, rfsr
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nop
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addk r8, r17, r0; /* Load exception address */
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bralid r15, full_exception; /* Branch to the handler */
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nop;
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mts rfsr, r0; /* Clear sticky fsr */
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nop
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/*
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* Trigger execution of the signal handler by enabling
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* interrupts and calling an invalid syscall.
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*/
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mfs r5, rmsr;
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nop
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ori r5, r5, 2;
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mts rmsr, r5; /* enable interrupt */
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nop
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addi r12, r0, __NR_syscalls;
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brki r14, 0x08;
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mfs r5, rmsr; /* disable interrupt */
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nop
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andi r5, r5, ~2;
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mts rmsr, r5;
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nop
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lwi r7, r1, PT_R7
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lwi r8, r1, PT_R8
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lwi r9, r1, PT_R9
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lwi r10, r1, PT_R10
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lwi r11, r1, PT_R11
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lwi r12, r1, PT_R12
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lwi r14, r1, PT_R14
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lwi r15, r1, PT_R15
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lwi r18, r1, PT_R18
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bri ex_handler_done; /* Complete exception handling */
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#endif
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/* 0x01 - Unaligned data access exception
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* This occurs when a word access is not aligned on a word boundary,
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* or when a 16-bit access is not aligned on a 16-bit boundary.
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* This handler perform the access, and returns, except for MMU when
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* the unaligned address is last on a 4k page or the physical address is
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* not found in the page table, in which case unaligned_data_trap is called.
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*/
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handle_unaligned_ex:
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/* Working registers already saved: R3, R4, R5, R6
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* R4 = ESR
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* R3 = EAR
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*/
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#ifdef CONFIG_MMU
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andi r6, r4, 0x1000 /* Check ESR[DS] */
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beqi r6, _no_delayslot /* Branch if ESR[DS] not set */
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mfs r17, rbtr; /* ESR[DS] set - return address in BTR */
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nop
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_no_delayslot:
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/* jump to high level unaligned handler */
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RESTORE_STATE;
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bri unaligned_data_trap
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#endif
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andi r6, r4, 0x3E0; /* Mask and extract the register operand */
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srl r6, r6; /* r6 >> 5 */
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srl r6, r6;
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srl r6, r6;
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srl r6, r6;
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srl r6, r6;
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/* Store the register operand in a temporary location */
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sbi r6, r0, TOPHYS(ex_reg_op);
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andi r6, r4, 0x400; /* Extract ESR[S] */
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bnei r6, ex_sw;
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ex_lw:
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andi r6, r4, 0x800; /* Extract ESR[W] */
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beqi r6, ex_lhw;
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lbui r5, r3, 0; /* Exception address in r3 */
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/* Load a word, byte-by-byte from destination address
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and save it in tmp space */
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sbi r5, r0, TOPHYS(ex_tmp_data_loc_0);
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lbui r5, r3, 1;
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sbi r5, r0, TOPHYS(ex_tmp_data_loc_1);
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lbui r5, r3, 2;
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sbi r5, r0, TOPHYS(ex_tmp_data_loc_2);
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lbui r5, r3, 3;
|
|
sbi r5, r0, TOPHYS(ex_tmp_data_loc_3);
|
|
/* Get the destination register value into r4 */
|
|
lwi r4, r0, TOPHYS(ex_tmp_data_loc_0);
|
|
bri ex_lw_tail;
|
|
ex_lhw:
|
|
lbui r5, r3, 0; /* Exception address in r3 */
|
|
/* Load a half-word, byte-by-byte from destination
|
|
address and save it in tmp space */
|
|
sbi r5, r0, TOPHYS(ex_tmp_data_loc_0);
|
|
lbui r5, r3, 1;
|
|
sbi r5, r0, TOPHYS(ex_tmp_data_loc_1);
|
|
/* Get the destination register value into r4 */
|
|
lhui r4, r0, TOPHYS(ex_tmp_data_loc_0);
|
|
ex_lw_tail:
|
|
/* Get the destination register number into r5 */
|
|
lbui r5, r0, TOPHYS(ex_reg_op);
|
|
/* Form load_word jump table offset (lw_table + (8 * regnum)) */
|
|
la r6, r0, TOPHYS(lw_table);
|
|
addk r5, r5, r5;
|
|
addk r5, r5, r5;
|
|
addk r5, r5, r5;
|
|
addk r5, r5, r6;
|
|
bra r5;
|
|
ex_lw_end: /* Exception handling of load word, ends */
|
|
ex_sw:
|
|
/* Get the destination register number into r5 */
|
|
lbui r5, r0, TOPHYS(ex_reg_op);
|
|
/* Form store_word jump table offset (sw_table + (8 * regnum)) */
|
|
la r6, r0, TOPHYS(sw_table);
|
|
add r5, r5, r5;
|
|
add r5, r5, r5;
|
|
add r5, r5, r5;
|
|
add r5, r5, r6;
|
|
bra r5;
|
|
ex_sw_tail:
|
|
mfs r6, resr;
|
|
nop
|
|
andi r6, r6, 0x800; /* Extract ESR[W] */
|
|
beqi r6, ex_shw;
|
|
/* Get the word - delay slot */
|
|
swi r4, r0, TOPHYS(ex_tmp_data_loc_0);
|
|
/* Store the word, byte-by-byte into destination address */
|
|
lbui r4, r0, TOPHYS(ex_tmp_data_loc_0);
|
|
sbi r4, r3, 0;
|
|
lbui r4, r0, TOPHYS(ex_tmp_data_loc_1);
|
|
sbi r4, r3, 1;
|
|
lbui r4, r0, TOPHYS(ex_tmp_data_loc_2);
|
|
sbi r4, r3, 2;
|
|
lbui r4, r0, TOPHYS(ex_tmp_data_loc_3);
|
|
sbi r4, r3, 3;
|
|
bri ex_handler_done;
|
|
|
|
ex_shw:
|
|
/* Store the lower half-word, byte-by-byte into destination address */
|
|
swi r4, r0, TOPHYS(ex_tmp_data_loc_0);
|
|
lbui r4, r0, TOPHYS(ex_tmp_data_loc_2);
|
|
sbi r4, r3, 0;
|
|
lbui r4, r0, TOPHYS(ex_tmp_data_loc_3);
|
|
sbi r4, r3, 1;
|
|
ex_sw_end: /* Exception handling of store word, ends. */
|
|
|
|
ex_handler_done:
|
|
#ifndef CONFIG_MMU
|
|
lwi r5, r1, 0 /* RMSR */
|
|
mts rmsr, r5
|
|
nop
|
|
lwi r3, r1, PT_R3
|
|
lwi r4, r1, PT_R4
|
|
lwi r5, r1, PT_R5
|
|
lwi r6, r1, PT_R6
|
|
lwi r17, r1, PT_R17
|
|
|
|
rted r17, 0
|
|
addik r1, r1, (EX_HANDLER_STACK_SIZ); /* Restore stack frame */
|
|
#else
|
|
RESTORE_STATE;
|
|
rted r17, 0
|
|
nop
|
|
#endif
|
|
|
|
#ifdef CONFIG_MMU
|
|
/* Exception vector entry code. This code runs with address translation
|
|
* turned off (i.e. using physical addresses). */
|
|
|
|
/* Exception vectors. */
|
|
|
|
/* 0x10 - Data Storage Exception
|
|
* This happens for just a few reasons. U0 set (but we don't do that),
|
|
* or zone protection fault (user violation, write to protected page).
|
|
* If this is just an update of modified status, we do that quickly
|
|
* and exit. Otherwise, we call heavyweight functions to do the work.
|
|
*/
|
|
handle_data_storage_exception:
|
|
/* Working registers already saved: R3, R4, R5, R6
|
|
* R3 = ESR
|
|
*/
|
|
mfs r11, rpid
|
|
nop
|
|
/* If we are faulting a kernel address, we have to use the
|
|
* kernel page tables.
|
|
*/
|
|
ori r5, r0, CONFIG_KERNEL_START
|
|
cmpu r5, r3, r5
|
|
bgti r5, ex3
|
|
/* First, check if it was a zone fault (which means a user
|
|
* tried to access a kernel or read-protected page - always
|
|
* a SEGV). All other faults here must be stores, so no
|
|
* need to check ESR_S as well. */
|
|
andi r4, r4, 0x800 /* ESR_Z - zone protection */
|
|
bnei r4, ex2
|
|
|
|
ori r4, r0, swapper_pg_dir
|
|
mts rpid, r0 /* TLB will have 0 TID */
|
|
nop
|
|
bri ex4
|
|
|
|
/* Get the PGD for the current thread. */
|
|
ex3:
|
|
/* First, check if it was a zone fault (which means a user
|
|
* tried to access a kernel or read-protected page - always
|
|
* a SEGV). All other faults here must be stores, so no
|
|
* need to check ESR_S as well. */
|
|
andi r4, r4, 0x800 /* ESR_Z */
|
|
bnei r4, ex2
|
|
/* get current task address */
|
|
addi r4 ,CURRENT_TASK, TOPHYS(0);
|
|
lwi r4, r4, TASK_THREAD+PGDIR
|
|
ex4:
|
|
tophys(r4,r4)
|
|
BSRLI(r5,r3,20) /* Create L1 (pgdir/pmd) address */
|
|
andi r5, r5, 0xffc
|
|
/* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */
|
|
or r4, r4, r5
|
|
lwi r4, r4, 0 /* Get L1 entry */
|
|
andi r5, r4, 0xfffff000 /* Extract L2 (pte) base address */
|
|
beqi r5, ex2 /* Bail if no table */
|
|
|
|
tophys(r5,r5)
|
|
BSRLI(r6,r3,10) /* Compute PTE address */
|
|
andi r6, r6, 0xffc
|
|
andi r5, r5, 0xfffff003
|
|
or r5, r5, r6
|
|
lwi r4, r5, 0 /* Get Linux PTE */
|
|
|
|
andi r6, r4, _PAGE_RW /* Is it writeable? */
|
|
beqi r6, ex2 /* Bail if not */
|
|
|
|
/* Update 'changed' */
|
|
ori r4, r4, _PAGE_DIRTY|_PAGE_ACCESSED|_PAGE_HWWRITE
|
|
swi r4, r5, 0 /* Update Linux page table */
|
|
|
|
/* Most of the Linux PTE is ready to load into the TLB LO.
|
|
* We set ZSEL, where only the LS-bit determines user access.
|
|
* We set execute, because we don't have the granularity to
|
|
* properly set this at the page level (Linux problem).
|
|
* If shared is set, we cause a zero PID->TID load.
|
|
* Many of these bits are software only. Bits we don't set
|
|
* here we (properly should) assume have the appropriate value.
|
|
*/
|
|
andni r4, r4, 0x0ce2 /* Make sure 20, 21 are zero */
|
|
ori r4, r4, _PAGE_HWEXEC /* make it executable */
|
|
|
|
/* find the TLB index that caused the fault. It has to be here*/
|
|
mts rtlbsx, r3
|
|
nop
|
|
mfs r5, rtlbx /* DEBUG: TBD */
|
|
nop
|
|
mts rtlblo, r4 /* Load TLB LO */
|
|
nop
|
|
/* Will sync shadow TLBs */
|
|
|
|
/* Done...restore registers and get out of here. */
|
|
mts rpid, r11
|
|
nop
|
|
bri 4
|
|
|
|
RESTORE_STATE;
|
|
rted r17, 0
|
|
nop
|
|
ex2:
|
|
/* The bailout. Restore registers to pre-exception conditions
|
|
* and call the heavyweights to help us out. */
|
|
mts rpid, r11
|
|
nop
|
|
bri 4
|
|
RESTORE_STATE;
|
|
bri page_fault_data_trap
|
|
|
|
|
|
/* 0x11 - Instruction Storage Exception
|
|
* This is caused by a fetch from non-execute or guarded pages. */
|
|
handle_instruction_storage_exception:
|
|
/* Working registers already saved: R3, R4, R5, R6
|
|
* R3 = ESR
|
|
*/
|
|
|
|
RESTORE_STATE;
|
|
bri page_fault_instr_trap
|
|
|
|
/* 0x12 - Data TLB Miss Exception
|
|
* As the name implies, translation is not in the MMU, so search the
|
|
* page tables and fix it. The only purpose of this function is to
|
|
* load TLB entries from the page table if they exist.
|
|
*/
|
|
handle_data_tlb_miss_exception:
|
|
/* Working registers already saved: R3, R4, R5, R6
|
|
* R3 = EAR, R4 = ESR
|
|
*/
|
|
mfs r11, rpid
|
|
nop
|
|
|
|
/* If we are faulting a kernel address, we have to use the
|
|
* kernel page tables. */
|
|
ori r6, r0, CONFIG_KERNEL_START
|
|
cmpu r4, r3, r6
|
|
bgti r4, ex5
|
|
ori r4, r0, swapper_pg_dir
|
|
mts rpid, r0 /* TLB will have 0 TID */
|
|
nop
|
|
bri ex6
|
|
|
|
/* Get the PGD for the current thread. */
|
|
ex5:
|
|
/* get current task address */
|
|
addi r4 ,CURRENT_TASK, TOPHYS(0);
|
|
lwi r4, r4, TASK_THREAD+PGDIR
|
|
ex6:
|
|
tophys(r4,r4)
|
|
BSRLI(r5,r3,20) /* Create L1 (pgdir/pmd) address */
|
|
andi r5, r5, 0xffc
|
|
/* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */
|
|
or r4, r4, r5
|
|
lwi r4, r4, 0 /* Get L1 entry */
|
|
andi r5, r4, 0xfffff000 /* Extract L2 (pte) base address */
|
|
beqi r5, ex7 /* Bail if no table */
|
|
|
|
tophys(r5,r5)
|
|
BSRLI(r6,r3,10) /* Compute PTE address */
|
|
andi r6, r6, 0xffc
|
|
andi r5, r5, 0xfffff003
|
|
or r5, r5, r6
|
|
lwi r4, r5, 0 /* Get Linux PTE */
|
|
|
|
andi r6, r4, _PAGE_PRESENT
|
|
beqi r6, ex7
|
|
|
|
ori r4, r4, _PAGE_ACCESSED
|
|
swi r4, r5, 0
|
|
|
|
/* Most of the Linux PTE is ready to load into the TLB LO.
|
|
* We set ZSEL, where only the LS-bit determines user access.
|
|
* We set execute, because we don't have the granularity to
|
|
* properly set this at the page level (Linux problem).
|
|
* If shared is set, we cause a zero PID->TID load.
|
|
* Many of these bits are software only. Bits we don't set
|
|
* here we (properly should) assume have the appropriate value.
|
|
*/
|
|
brid finish_tlb_load
|
|
andni r4, r4, 0x0ce2 /* Make sure 20, 21 are zero */
|
|
ex7:
|
|
/* The bailout. Restore registers to pre-exception conditions
|
|
* and call the heavyweights to help us out.
|
|
*/
|
|
mts rpid, r11
|
|
nop
|
|
bri 4
|
|
RESTORE_STATE;
|
|
bri page_fault_data_trap
|
|
|
|
/* 0x13 - Instruction TLB Miss Exception
|
|
* Nearly the same as above, except we get our information from
|
|
* different registers and bailout to a different point.
|
|
*/
|
|
handle_instruction_tlb_miss_exception:
|
|
/* Working registers already saved: R3, R4, R5, R6
|
|
* R3 = ESR
|
|
*/
|
|
mfs r11, rpid
|
|
nop
|
|
|
|
/* If we are faulting a kernel address, we have to use the
|
|
* kernel page tables.
|
|
*/
|
|
ori r4, r0, CONFIG_KERNEL_START
|
|
cmpu r4, r3, r4
|
|
bgti r4, ex8
|
|
ori r4, r0, swapper_pg_dir
|
|
mts rpid, r0 /* TLB will have 0 TID */
|
|
nop
|
|
bri ex9
|
|
|
|
/* Get the PGD for the current thread. */
|
|
ex8:
|
|
/* get current task address */
|
|
addi r4 ,CURRENT_TASK, TOPHYS(0);
|
|
lwi r4, r4, TASK_THREAD+PGDIR
|
|
ex9:
|
|
tophys(r4,r4)
|
|
BSRLI(r5,r3,20) /* Create L1 (pgdir/pmd) address */
|
|
andi r5, r5, 0xffc
|
|
/* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */
|
|
or r4, r4, r5
|
|
lwi r4, r4, 0 /* Get L1 entry */
|
|
andi r5, r4, 0xfffff000 /* Extract L2 (pte) base address */
|
|
beqi r5, ex10 /* Bail if no table */
|
|
|
|
tophys(r5,r5)
|
|
BSRLI(r6,r3,10) /* Compute PTE address */
|
|
andi r6, r6, 0xffc
|
|
andi r5, r5, 0xfffff003
|
|
or r5, r5, r6
|
|
lwi r4, r5, 0 /* Get Linux PTE */
|
|
|
|
andi r6, r4, _PAGE_PRESENT
|
|
beqi r6, ex10
|
|
|
|
ori r4, r4, _PAGE_ACCESSED
|
|
swi r4, r5, 0
|
|
|
|
/* Most of the Linux PTE is ready to load into the TLB LO.
|
|
* We set ZSEL, where only the LS-bit determines user access.
|
|
* We set execute, because we don't have the granularity to
|
|
* properly set this at the page level (Linux problem).
|
|
* If shared is set, we cause a zero PID->TID load.
|
|
* Many of these bits are software only. Bits we don't set
|
|
* here we (properly should) assume have the appropriate value.
|
|
*/
|
|
brid finish_tlb_load
|
|
andni r4, r4, 0x0ce2 /* Make sure 20, 21 are zero */
|
|
ex10:
|
|
/* The bailout. Restore registers to pre-exception conditions
|
|
* and call the heavyweights to help us out.
|
|
*/
|
|
mts rpid, r11
|
|
nop
|
|
bri 4
|
|
RESTORE_STATE;
|
|
bri page_fault_instr_trap
|
|
|
|
/* Both the instruction and data TLB miss get to this point to load the TLB.
|
|
* r3 - EA of fault
|
|
* r4 - TLB LO (info from Linux PTE)
|
|
* r5, r6 - available to use
|
|
* PID - loaded with proper value when we get here
|
|
* Upon exit, we reload everything and RFI.
|
|
* A common place to load the TLB.
|
|
*/
|
|
tlb_index:
|
|
.long 1 /* MS: storing last used tlb index */
|
|
finish_tlb_load:
|
|
/* MS: load the last used TLB index. */
|
|
lwi r5, r0, TOPHYS(tlb_index)
|
|
addik r5, r5, 1 /* MS: inc tlb_index -> use next one */
|
|
|
|
/* MS: FIXME this is potential fault, because this is mask not count */
|
|
andi r5, r5, (MICROBLAZE_TLB_SIZE-1)
|
|
ori r6, r0, 1
|
|
cmp r31, r5, r6
|
|
blti r31, ex12
|
|
addik r5, r6, 1
|
|
ex12:
|
|
/* MS: save back current TLB index */
|
|
swi r5, r0, TOPHYS(tlb_index)
|
|
|
|
ori r4, r4, _PAGE_HWEXEC /* make it executable */
|
|
mts rtlbx, r5 /* MS: save current TLB */
|
|
nop
|
|
mts rtlblo, r4 /* MS: save to TLB LO */
|
|
nop
|
|
|
|
/* Create EPN. This is the faulting address plus a static
|
|
* set of bits. These are size, valid, E, U0, and ensure
|
|
* bits 20 and 21 are zero.
|
|
*/
|
|
andi r3, r3, 0xfffff000
|
|
ori r3, r3, 0x0c0
|
|
mts rtlbhi, r3 /* Load TLB HI */
|
|
nop
|
|
|
|
/* Done...restore registers and get out of here. */
|
|
mts rpid, r11
|
|
nop
|
|
bri 4
|
|
RESTORE_STATE;
|
|
rted r17, 0
|
|
nop
|
|
|
|
/* extern void giveup_fpu(struct task_struct *prev)
|
|
*
|
|
* The MicroBlaze processor may have an FPU, so this should not just
|
|
* return: TBD.
|
|
*/
|
|
.globl giveup_fpu;
|
|
.align 4;
|
|
giveup_fpu:
|
|
bralid r15,0 /* TBD */
|
|
nop
|
|
|
|
/* At present, this routine just hangs. - extern void abort(void) */
|
|
.globl abort;
|
|
.align 4;
|
|
abort:
|
|
br r0
|
|
|
|
.globl set_context;
|
|
.align 4;
|
|
set_context:
|
|
mts rpid, r5 /* Shadow TLBs are automatically */
|
|
nop
|
|
bri 4 /* flushed by changing PID */
|
|
rtsd r15,8
|
|
nop
|
|
|
|
#endif
|
|
.end _hw_exception_handler
|
|
|
|
#ifdef CONFIG_MMU
|
|
/* Unaligned data access exception last on a 4k page for MMU.
|
|
* When this is called, we are in virtual mode with exceptions enabled
|
|
* and registers 1-13,15,17,18 saved.
|
|
*
|
|
* R3 = ESR
|
|
* R4 = EAR
|
|
* R7 = pointer to saved registers (struct pt_regs *regs)
|
|
*
|
|
* This handler perform the access, and returns via ret_from_exc.
|
|
*/
|
|
.global _unaligned_data_exception
|
|
.ent _unaligned_data_exception
|
|
_unaligned_data_exception:
|
|
andi r8, r3, 0x3E0; /* Mask and extract the register operand */
|
|
BSRLI(r8,r8,2); /* r8 >> 2 = register operand * 8 */
|
|
andi r6, r3, 0x400; /* Extract ESR[S] */
|
|
bneid r6, ex_sw_vm;
|
|
andi r6, r3, 0x800; /* Extract ESR[W] - delay slot */
|
|
ex_lw_vm:
|
|
beqid r6, ex_lhw_vm;
|
|
load1: lbui r5, r4, 0; /* Exception address in r4 - delay slot */
|
|
/* Load a word, byte-by-byte from destination address and save it in tmp space*/
|
|
la r6, r0, ex_tmp_data_loc_0;
|
|
sbi r5, r6, 0;
|
|
load2: lbui r5, r4, 1;
|
|
sbi r5, r6, 1;
|
|
load3: lbui r5, r4, 2;
|
|
sbi r5, r6, 2;
|
|
load4: lbui r5, r4, 3;
|
|
sbi r5, r6, 3;
|
|
brid ex_lw_tail_vm;
|
|
/* Get the destination register value into r3 - delay slot */
|
|
lwi r3, r6, 0;
|
|
ex_lhw_vm:
|
|
/* Load a half-word, byte-by-byte from destination address and
|
|
* save it in tmp space */
|
|
la r6, r0, ex_tmp_data_loc_0;
|
|
sbi r5, r6, 0;
|
|
load5: lbui r5, r4, 1;
|
|
sbi r5, r6, 1;
|
|
lhui r3, r6, 0; /* Get the destination register value into r3 */
|
|
ex_lw_tail_vm:
|
|
/* Form load_word jump table offset (lw_table_vm + (8 * regnum)) */
|
|
addik r5, r8, lw_table_vm;
|
|
bra r5;
|
|
ex_lw_end_vm: /* Exception handling of load word, ends */
|
|
brai ret_from_exc;
|
|
ex_sw_vm:
|
|
/* Form store_word jump table offset (sw_table_vm + (8 * regnum)) */
|
|
addik r5, r8, sw_table_vm;
|
|
bra r5;
|
|
ex_sw_tail_vm:
|
|
la r5, r0, ex_tmp_data_loc_0;
|
|
beqid r6, ex_shw_vm;
|
|
swi r3, r5, 0; /* Get the word - delay slot */
|
|
/* Store the word, byte-by-byte into destination address */
|
|
lbui r3, r5, 0;
|
|
store1: sbi r3, r4, 0;
|
|
lbui r3, r5, 1;
|
|
store2: sbi r3, r4, 1;
|
|
lbui r3, r5, 2;
|
|
store3: sbi r3, r4, 2;
|
|
lbui r3, r5, 3;
|
|
brid ret_from_exc;
|
|
store4: sbi r3, r4, 3; /* Delay slot */
|
|
ex_shw_vm:
|
|
/* Store the lower half-word, byte-by-byte into destination address */
|
|
lbui r3, r5, 2;
|
|
store5: sbi r3, r4, 0;
|
|
lbui r3, r5, 3;
|
|
brid ret_from_exc;
|
|
store6: sbi r3, r4, 1; /* Delay slot */
|
|
ex_sw_end_vm: /* Exception handling of store word, ends. */
|
|
|
|
/* We have to prevent cases that get/put_user macros get unaligned pointer
|
|
* to bad page area. We have to find out which origin instruction caused it
|
|
* and called fixup for that origin instruction not instruction in unaligned
|
|
* handler */
|
|
ex_unaligned_fixup:
|
|
ori r5, r7, 0 /* setup pointer to pt_regs */
|
|
lwi r6, r7, PT_PC; /* faulting address is one instruction above */
|
|
addik r6, r6, -4 /* for finding proper fixup */
|
|
swi r6, r7, PT_PC; /* a save back it to PT_PC */
|
|
addik r7, r0, SIGSEGV
|
|
/* call bad_page_fault for finding aligned fixup, fixup address is saved
|
|
* in PT_PC which is used as return address from exception */
|
|
la r15, r0, ret_from_exc-8 /* setup return address */
|
|
brid bad_page_fault
|
|
nop
|
|
|
|
/* We prevent all load/store because it could failed any attempt to access */
|
|
.section __ex_table,"a";
|
|
.word load1,ex_unaligned_fixup;
|
|
.word load2,ex_unaligned_fixup;
|
|
.word load3,ex_unaligned_fixup;
|
|
.word load4,ex_unaligned_fixup;
|
|
.word load5,ex_unaligned_fixup;
|
|
.word store1,ex_unaligned_fixup;
|
|
.word store2,ex_unaligned_fixup;
|
|
.word store3,ex_unaligned_fixup;
|
|
.word store4,ex_unaligned_fixup;
|
|
.word store5,ex_unaligned_fixup;
|
|
.word store6,ex_unaligned_fixup;
|
|
.previous;
|
|
.end _unaligned_data_exception
|
|
#endif /* CONFIG_MMU */
|
|
|
|
ex_handler_unhandled:
|
|
/* FIXME add handle function for unhandled exception - dump register */
|
|
bri 0
|
|
|
|
/*
|
|
* hw_exception_handler Jump Table
|
|
* - Contains code snippets for each register that caused the unalign exception
|
|
* - Hence exception handler is NOT self-modifying
|
|
* - Separate table for load exceptions and store exceptions.
|
|
* - Each table is of size: (8 * 32) = 256 bytes
|
|
*/
|
|
|
|
.section .text
|
|
.align 4
|
|
lw_table:
|
|
lw_r0: R3_TO_LWREG (0);
|
|
lw_r1: LWREG_NOP;
|
|
lw_r2: R3_TO_LWREG (2);
|
|
lw_r3: R3_TO_LWREG_V (3);
|
|
lw_r4: R3_TO_LWREG_V (4);
|
|
lw_r5: R3_TO_LWREG_V (5);
|
|
lw_r6: R3_TO_LWREG_V (6);
|
|
lw_r7: R3_TO_LWREG (7);
|
|
lw_r8: R3_TO_LWREG (8);
|
|
lw_r9: R3_TO_LWREG (9);
|
|
lw_r10: R3_TO_LWREG (10);
|
|
lw_r11: R3_TO_LWREG (11);
|
|
lw_r12: R3_TO_LWREG (12);
|
|
lw_r13: R3_TO_LWREG (13);
|
|
lw_r14: R3_TO_LWREG (14);
|
|
lw_r15: R3_TO_LWREG (15);
|
|
lw_r16: R3_TO_LWREG (16);
|
|
lw_r17: LWREG_NOP;
|
|
lw_r18: R3_TO_LWREG (18);
|
|
lw_r19: R3_TO_LWREG (19);
|
|
lw_r20: R3_TO_LWREG (20);
|
|
lw_r21: R3_TO_LWREG (21);
|
|
lw_r22: R3_TO_LWREG (22);
|
|
lw_r23: R3_TO_LWREG (23);
|
|
lw_r24: R3_TO_LWREG (24);
|
|
lw_r25: R3_TO_LWREG (25);
|
|
lw_r26: R3_TO_LWREG (26);
|
|
lw_r27: R3_TO_LWREG (27);
|
|
lw_r28: R3_TO_LWREG (28);
|
|
lw_r29: R3_TO_LWREG (29);
|
|
lw_r30: R3_TO_LWREG (30);
|
|
#ifdef CONFIG_MMU
|
|
lw_r31: R3_TO_LWREG_V (31);
|
|
#else
|
|
lw_r31: R3_TO_LWREG (31);
|
|
#endif
|
|
|
|
sw_table:
|
|
sw_r0: SWREG_TO_R3 (0);
|
|
sw_r1: SWREG_NOP;
|
|
sw_r2: SWREG_TO_R3 (2);
|
|
sw_r3: SWREG_TO_R3_V (3);
|
|
sw_r4: SWREG_TO_R3_V (4);
|
|
sw_r5: SWREG_TO_R3_V (5);
|
|
sw_r6: SWREG_TO_R3_V (6);
|
|
sw_r7: SWREG_TO_R3 (7);
|
|
sw_r8: SWREG_TO_R3 (8);
|
|
sw_r9: SWREG_TO_R3 (9);
|
|
sw_r10: SWREG_TO_R3 (10);
|
|
sw_r11: SWREG_TO_R3 (11);
|
|
sw_r12: SWREG_TO_R3 (12);
|
|
sw_r13: SWREG_TO_R3 (13);
|
|
sw_r14: SWREG_TO_R3 (14);
|
|
sw_r15: SWREG_TO_R3 (15);
|
|
sw_r16: SWREG_TO_R3 (16);
|
|
sw_r17: SWREG_NOP;
|
|
sw_r18: SWREG_TO_R3 (18);
|
|
sw_r19: SWREG_TO_R3 (19);
|
|
sw_r20: SWREG_TO_R3 (20);
|
|
sw_r21: SWREG_TO_R3 (21);
|
|
sw_r22: SWREG_TO_R3 (22);
|
|
sw_r23: SWREG_TO_R3 (23);
|
|
sw_r24: SWREG_TO_R3 (24);
|
|
sw_r25: SWREG_TO_R3 (25);
|
|
sw_r26: SWREG_TO_R3 (26);
|
|
sw_r27: SWREG_TO_R3 (27);
|
|
sw_r28: SWREG_TO_R3 (28);
|
|
sw_r29: SWREG_TO_R3 (29);
|
|
sw_r30: SWREG_TO_R3 (30);
|
|
#ifdef CONFIG_MMU
|
|
sw_r31: SWREG_TO_R3_V (31);
|
|
#else
|
|
sw_r31: SWREG_TO_R3 (31);
|
|
#endif
|
|
|
|
#ifdef CONFIG_MMU
|
|
lw_table_vm:
|
|
lw_r0_vm: R3_TO_LWREG_VM (0);
|
|
lw_r1_vm: R3_TO_LWREG_VM_V (1);
|
|
lw_r2_vm: R3_TO_LWREG_VM_V (2);
|
|
lw_r3_vm: R3_TO_LWREG_VM_V (3);
|
|
lw_r4_vm: R3_TO_LWREG_VM_V (4);
|
|
lw_r5_vm: R3_TO_LWREG_VM_V (5);
|
|
lw_r6_vm: R3_TO_LWREG_VM_V (6);
|
|
lw_r7_vm: R3_TO_LWREG_VM_V (7);
|
|
lw_r8_vm: R3_TO_LWREG_VM_V (8);
|
|
lw_r9_vm: R3_TO_LWREG_VM_V (9);
|
|
lw_r10_vm: R3_TO_LWREG_VM_V (10);
|
|
lw_r11_vm: R3_TO_LWREG_VM_V (11);
|
|
lw_r12_vm: R3_TO_LWREG_VM_V (12);
|
|
lw_r13_vm: R3_TO_LWREG_VM_V (13);
|
|
lw_r14_vm: R3_TO_LWREG_VM (14);
|
|
lw_r15_vm: R3_TO_LWREG_VM_V (15);
|
|
lw_r16_vm: R3_TO_LWREG_VM (16);
|
|
lw_r17_vm: R3_TO_LWREG_VM_V (17);
|
|
lw_r18_vm: R3_TO_LWREG_VM_V (18);
|
|
lw_r19_vm: R3_TO_LWREG_VM (19);
|
|
lw_r20_vm: R3_TO_LWREG_VM (20);
|
|
lw_r21_vm: R3_TO_LWREG_VM (21);
|
|
lw_r22_vm: R3_TO_LWREG_VM (22);
|
|
lw_r23_vm: R3_TO_LWREG_VM (23);
|
|
lw_r24_vm: R3_TO_LWREG_VM (24);
|
|
lw_r25_vm: R3_TO_LWREG_VM (25);
|
|
lw_r26_vm: R3_TO_LWREG_VM (26);
|
|
lw_r27_vm: R3_TO_LWREG_VM (27);
|
|
lw_r28_vm: R3_TO_LWREG_VM (28);
|
|
lw_r29_vm: R3_TO_LWREG_VM (29);
|
|
lw_r30_vm: R3_TO_LWREG_VM (30);
|
|
lw_r31_vm: R3_TO_LWREG_VM_V (31);
|
|
|
|
sw_table_vm:
|
|
sw_r0_vm: SWREG_TO_R3_VM (0);
|
|
sw_r1_vm: SWREG_TO_R3_VM_V (1);
|
|
sw_r2_vm: SWREG_TO_R3_VM_V (2);
|
|
sw_r3_vm: SWREG_TO_R3_VM_V (3);
|
|
sw_r4_vm: SWREG_TO_R3_VM_V (4);
|
|
sw_r5_vm: SWREG_TO_R3_VM_V (5);
|
|
sw_r6_vm: SWREG_TO_R3_VM_V (6);
|
|
sw_r7_vm: SWREG_TO_R3_VM_V (7);
|
|
sw_r8_vm: SWREG_TO_R3_VM_V (8);
|
|
sw_r9_vm: SWREG_TO_R3_VM_V (9);
|
|
sw_r10_vm: SWREG_TO_R3_VM_V (10);
|
|
sw_r11_vm: SWREG_TO_R3_VM_V (11);
|
|
sw_r12_vm: SWREG_TO_R3_VM_V (12);
|
|
sw_r13_vm: SWREG_TO_R3_VM_V (13);
|
|
sw_r14_vm: SWREG_TO_R3_VM (14);
|
|
sw_r15_vm: SWREG_TO_R3_VM_V (15);
|
|
sw_r16_vm: SWREG_TO_R3_VM (16);
|
|
sw_r17_vm: SWREG_TO_R3_VM_V (17);
|
|
sw_r18_vm: SWREG_TO_R3_VM_V (18);
|
|
sw_r19_vm: SWREG_TO_R3_VM (19);
|
|
sw_r20_vm: SWREG_TO_R3_VM (20);
|
|
sw_r21_vm: SWREG_TO_R3_VM (21);
|
|
sw_r22_vm: SWREG_TO_R3_VM (22);
|
|
sw_r23_vm: SWREG_TO_R3_VM (23);
|
|
sw_r24_vm: SWREG_TO_R3_VM (24);
|
|
sw_r25_vm: SWREG_TO_R3_VM (25);
|
|
sw_r26_vm: SWREG_TO_R3_VM (26);
|
|
sw_r27_vm: SWREG_TO_R3_VM (27);
|
|
sw_r28_vm: SWREG_TO_R3_VM (28);
|
|
sw_r29_vm: SWREG_TO_R3_VM (29);
|
|
sw_r30_vm: SWREG_TO_R3_VM (30);
|
|
sw_r31_vm: SWREG_TO_R3_VM_V (31);
|
|
#endif /* CONFIG_MMU */
|
|
|
|
/* Temporary data structures used in the handler */
|
|
.section .data
|
|
.align 4
|
|
ex_tmp_data_loc_0:
|
|
.byte 0
|
|
ex_tmp_data_loc_1:
|
|
.byte 0
|
|
ex_tmp_data_loc_2:
|
|
.byte 0
|
|
ex_tmp_data_loc_3:
|
|
.byte 0
|
|
ex_reg_op:
|
|
.byte 0
|