| /* |
| * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> |
| * Copyright (C) 2007-2009 PetaLogix |
| * Copyright (C) 2006 Atmark Techno, Inc. |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/thread_info.h> |
| #include <linux/errno.h> |
| #include <asm/entry.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/registers.h> |
| #include <asm/unistd.h> |
| #include <asm/percpu.h> |
| #include <asm/signal.h> |
| |
| #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR |
| .macro disable_irq |
| msrclr r0, MSR_IE |
| .endm |
| |
| .macro enable_irq |
| msrset r0, MSR_IE |
| .endm |
| |
| .macro clear_bip |
| msrclr r0, MSR_BIP |
| .endm |
| #else |
| .macro disable_irq |
| mfs r11, rmsr |
| andi r11, r11, ~MSR_IE |
| mts rmsr, r11 |
| .endm |
| |
| .macro enable_irq |
| mfs r11, rmsr |
| ori r11, r11, MSR_IE |
| mts rmsr, r11 |
| .endm |
| |
| .macro clear_bip |
| mfs r11, rmsr |
| andi r11, r11, ~MSR_BIP |
| mts rmsr, r11 |
| .endm |
| #endif |
| |
| ENTRY(_interrupt) |
| swi r1, r0, PER_CPU(ENTRY_SP) /* save the current sp */ |
| swi r11, r0, PER_CPU(R11_SAVE) /* temporarily save r11 */ |
| lwi r11, r0, PER_CPU(KM) /* load mode indicator */ |
| beqid r11, 1f |
| nop |
| brid 2f /* jump over */ |
| addik r1, r1, (-PT_SIZE) /* room for pt_regs (delay slot) */ |
| 1: /* switch to kernel stack */ |
| lwi r1, r0, PER_CPU(CURRENT_SAVE) /* get the saved current */ |
| lwi r1, r1, TS_THREAD_INFO /* get the thread info */ |
| /* calculate kernel stack pointer */ |
| addik r1, r1, THREAD_SIZE - PT_SIZE |
| 2: |
| swi r11, r1, PT_MODE /* store the mode */ |
| lwi r11, r0, PER_CPU(R11_SAVE) /* reload r11 */ |
| swi r2, r1, PT_R2 |
| swi r3, r1, PT_R3 |
| swi r4, r1, PT_R4 |
| swi r5, r1, PT_R5 |
| swi r6, r1, PT_R6 |
| swi r7, r1, PT_R7 |
| swi r8, r1, PT_R8 |
| swi r9, r1, PT_R9 |
| swi r10, r1, PT_R10 |
| swi r11, r1, PT_R11 |
| swi r12, r1, PT_R12 |
| swi r13, r1, PT_R13 |
| swi r14, r1, PT_R14 |
| swi r14, r1, PT_PC |
| swi r15, r1, PT_R15 |
| swi r16, r1, PT_R16 |
| swi r17, r1, PT_R17 |
| swi r18, r1, PT_R18 |
| swi r19, r1, PT_R19 |
| swi r20, r1, PT_R20 |
| swi r21, r1, PT_R21 |
| swi r22, r1, PT_R22 |
| swi r23, r1, PT_R23 |
| swi r24, r1, PT_R24 |
| swi r25, r1, PT_R25 |
| swi r26, r1, PT_R26 |
| swi r27, r1, PT_R27 |
| swi r28, r1, PT_R28 |
| swi r29, r1, PT_R29 |
| swi r30, r1, PT_R30 |
| swi r31, r1, PT_R31 |
| /* special purpose registers */ |
| mfs r11, rmsr |
| swi r11, r1, PT_MSR |
| mfs r11, rear |
| swi r11, r1, PT_EAR |
| mfs r11, resr |
| swi r11, r1, PT_ESR |
| mfs r11, rfsr |
| swi r11, r1, PT_FSR |
| /* reload original stack pointer and save it */ |
| lwi r11, r0, PER_CPU(ENTRY_SP) |
| swi r11, r1, PT_R1 |
| /* update mode indicator we are in kernel mode */ |
| addik r11, r0, 1 |
| swi r11, r0, PER_CPU(KM) |
| /* restore r31 */ |
| lwi r31, r0, PER_CPU(CURRENT_SAVE) |
| /* prepare the link register, the argument and jump */ |
| addik r15, r0, ret_from_intr - 8 |
| addk r6, r0, r15 |
| braid do_IRQ |
| add r5, r0, r1 |
| |
| ret_from_intr: |
| lwi r11, r1, PT_MODE |
| bneid r11, no_intr_resched |
| |
| 3: |
| lwi r6, r31, TS_THREAD_INFO /* get thread info */ |
| lwi r19, r6, TI_FLAGS /* get flags in thread info */ |
| /* do an extra work if any bits are set */ |
| |
| andi r11, r19, _TIF_NEED_RESCHED |
| beqi r11, 1f |
| bralid r15, schedule |
| nop |
| bri 3b |
| 1: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME |
| beqid r11, no_intr_resched |
| addk r5, r1, r0 |
| bralid r15, do_notify_resume |
| addk r6, r0, r0 |
| bri 3b |
| |
| no_intr_resched: |
| /* Disable interrupts, we are now committed to the state restore */ |
| disable_irq |
| |
| /* save mode indicator */ |
| lwi r11, r1, PT_MODE |
| swi r11, r0, PER_CPU(KM) |
| |
| /* save r31 */ |
| swi r31, r0, PER_CPU(CURRENT_SAVE) |
| restore_context: |
| /* special purpose registers */ |
| lwi r11, r1, PT_FSR |
| mts rfsr, r11 |
| lwi r11, r1, PT_ESR |
| mts resr, r11 |
| lwi r11, r1, PT_EAR |
| mts rear, r11 |
| lwi r11, r1, PT_MSR |
| mts rmsr, r11 |
| |
| lwi r31, r1, PT_R31 |
| lwi r30, r1, PT_R30 |
| lwi r29, r1, PT_R29 |
| lwi r28, r1, PT_R28 |
| lwi r27, r1, PT_R27 |
| lwi r26, r1, PT_R26 |
| lwi r25, r1, PT_R25 |
| lwi r24, r1, PT_R24 |
| lwi r23, r1, PT_R23 |
| lwi r22, r1, PT_R22 |
| lwi r21, r1, PT_R21 |
| lwi r20, r1, PT_R20 |
| lwi r19, r1, PT_R19 |
| lwi r18, r1, PT_R18 |
| lwi r17, r1, PT_R17 |
| lwi r16, r1, PT_R16 |
| lwi r15, r1, PT_R15 |
| lwi r14, r1, PT_PC |
| lwi r13, r1, PT_R13 |
| lwi r12, r1, PT_R12 |
| lwi r11, r1, PT_R11 |
| lwi r10, r1, PT_R10 |
| lwi r9, r1, PT_R9 |
| lwi r8, r1, PT_R8 |
| lwi r7, r1, PT_R7 |
| lwi r6, r1, PT_R6 |
| lwi r5, r1, PT_R5 |
| lwi r4, r1, PT_R4 |
| lwi r3, r1, PT_R3 |
| lwi r2, r1, PT_R2 |
| lwi r1, r1, PT_R1 |
| rtid r14, 0 |
| nop |
| |
| ENTRY(_reset) |
| brai 0; |
| |
| ENTRY(_user_exception) |
| swi r1, r0, PER_CPU(ENTRY_SP) /* save the current sp */ |
| swi r11, r0, PER_CPU(R11_SAVE) /* temporarily save r11 */ |
| lwi r11, r0, PER_CPU(KM) /* load mode indicator */ |
| beqid r11, 1f /* Already in kernel mode? */ |
| nop |
| brid 2f /* jump over */ |
| addik r1, r1, (-PT_SIZE) /* Room for pt_regs (delay slot) */ |
| 1: /* Switch to kernel stack */ |
| lwi r1, r0, PER_CPU(CURRENT_SAVE) /* get the saved current */ |
| lwi r1, r1, TS_THREAD_INFO /* get the thread info */ |
| /* calculate kernel stack pointer */ |
| addik r1, r1, THREAD_SIZE - PT_SIZE |
| 2: |
| swi r11, r1, PT_MODE /* store the mode */ |
| lwi r11, r0, PER_CPU(R11_SAVE) /* reload r11 */ |
| /* save them on stack */ |
| swi r2, r1, PT_R2 |
| swi r3, r1, PT_R3 /* r3: _always_ in clobber list; see unistd.h */ |
| swi r4, r1, PT_R4 /* r4: _always_ in clobber list; see unistd.h */ |
| swi r5, r1, PT_R5 |
| swi r6, r1, PT_R6 |
| swi r7, r1, PT_R7 |
| swi r8, r1, PT_R8 |
| swi r9, r1, PT_R9 |
| swi r10, r1, PT_R10 |
| swi r11, r1, PT_R11 |
| /* r12: _always_ in clobber list; see unistd.h */ |
| swi r12, r1, PT_R12 |
| swi r13, r1, PT_R13 |
| /* r14: _always_ in clobber list; see unistd.h */ |
| swi r14, r1, PT_R14 |
| /* but we want to return to the next inst. */ |
| addik r14, r14, 0x4 |
| swi r14, r1, PT_PC /* increment by 4 and store in pc */ |
| swi r15, r1, PT_R15 |
| swi r16, r1, PT_R16 |
| swi r17, r1, PT_R17 |
| swi r18, r1, PT_R18 |
| swi r19, r1, PT_R19 |
| swi r20, r1, PT_R20 |
| swi r21, r1, PT_R21 |
| swi r22, r1, PT_R22 |
| swi r23, r1, PT_R23 |
| swi r24, r1, PT_R24 |
| swi r25, r1, PT_R25 |
| swi r26, r1, PT_R26 |
| swi r27, r1, PT_R27 |
| swi r28, r1, PT_R28 |
| swi r29, r1, PT_R29 |
| swi r30, r1, PT_R30 |
| swi r31, r1, PT_R31 |
| |
| disable_irq |
| nop /* make sure IE bit is in effect */ |
| clear_bip /* once IE is in effect it is safe to clear BIP */ |
| nop |
| |
| /* special purpose registers */ |
| mfs r11, rmsr |
| swi r11, r1, PT_MSR |
| mfs r11, rear |
| swi r11, r1, PT_EAR |
| mfs r11, resr |
| swi r11, r1, PT_ESR |
| mfs r11, rfsr |
| swi r11, r1, PT_FSR |
| /* reload original stack pointer and save it */ |
| lwi r11, r0, PER_CPU(ENTRY_SP) |
| swi r11, r1, PT_R1 |
| /* update mode indicator we are in kernel mode */ |
| addik r11, r0, 1 |
| swi r11, r0, PER_CPU(KM) |
| /* restore r31 */ |
| lwi r31, r0, PER_CPU(CURRENT_SAVE) |
| /* re-enable interrupts now we are in kernel mode */ |
| enable_irq |
| |
| /* See if the system call number is valid. */ |
| addi r11, r12, -__NR_syscalls |
| bgei r11, 1f /* return to user if not valid */ |
| /* Figure out which function to use for this system call. */ |
| /* Note Microblaze barrel shift is optional, so don't rely on it */ |
| add r12, r12, r12 /* convert num -> ptr */ |
| addik r30, r0, 1 /* restarts allowed */ |
| add r12, r12, r12 |
| lwi r12, r12, sys_call_table /* Get function pointer */ |
| addik r15, r0, ret_to_user-8 /* set return address */ |
| bra r12 /* Make the system call. */ |
| bri 0 /* won't reach here */ |
| 1: |
| brid ret_to_user /* jump to syscall epilogue */ |
| addi r3, r0, -ENOSYS /* set errno in delay slot */ |
| |
| /* |
| * Debug traps are like a system call, but entered via brki r14, 0x60 |
| * All we need to do is send the SIGTRAP signal to current, ptrace and |
| * do_notify_resume will handle the rest |
| */ |
| ENTRY(_debug_exception) |
| swi r1, r0, PER_CPU(ENTRY_SP) /* save the current sp */ |
| lwi r1, r0, PER_CPU(CURRENT_SAVE) /* get the saved current */ |
| lwi r1, r1, TS_THREAD_INFO /* get the thread info */ |
| addik r1, r1, THREAD_SIZE - PT_SIZE /* get the kernel stack */ |
| swi r11, r0, PER_CPU(R11_SAVE) /* temporarily save r11 */ |
| lwi r11, r0, PER_CPU(KM) /* load mode indicator */ |
| //save_context: |
| swi r11, r1, PT_MODE /* store the mode */ |
| lwi r11, r0, PER_CPU(R11_SAVE) /* reload r11 */ |
| /* save them on stack */ |
| swi r2, r1, PT_R2 |
| swi r3, r1, PT_R3 /* r3: _always_ in clobber list; see unistd.h */ |
| swi r4, r1, PT_R4 /* r4: _always_ in clobber list; see unistd.h */ |
| swi r5, r1, PT_R5 |
| swi r6, r1, PT_R6 |
| swi r7, r1, PT_R7 |
| swi r8, r1, PT_R8 |
| swi r9, r1, PT_R9 |
| swi r10, r1, PT_R10 |
| swi r11, r1, PT_R11 |
| /* r12: _always_ in clobber list; see unistd.h */ |
| swi r12, r1, PT_R12 |
| swi r13, r1, PT_R13 |
| /* r14: _always_ in clobber list; see unistd.h */ |
| swi r14, r1, PT_R14 |
| swi r14, r1, PT_PC /* Will return to interrupted instruction */ |
| swi r15, r1, PT_R15 |
| swi r16, r1, PT_R16 |
| swi r17, r1, PT_R17 |
| swi r18, r1, PT_R18 |
| swi r19, r1, PT_R19 |
| swi r20, r1, PT_R20 |
| swi r21, r1, PT_R21 |
| swi r22, r1, PT_R22 |
| swi r23, r1, PT_R23 |
| swi r24, r1, PT_R24 |
| swi r25, r1, PT_R25 |
| swi r26, r1, PT_R26 |
| swi r27, r1, PT_R27 |
| swi r28, r1, PT_R28 |
| swi r29, r1, PT_R29 |
| swi r30, r1, PT_R30 |
| swi r31, r1, PT_R31 |
| |
| disable_irq |
| nop /* make sure IE bit is in effect */ |
| clear_bip /* once IE is in effect it is safe to clear BIP */ |
| nop |
| |
| /* special purpose registers */ |
| mfs r11, rmsr |
| swi r11, r1, PT_MSR |
| mfs r11, rear |
| swi r11, r1, PT_EAR |
| mfs r11, resr |
| swi r11, r1, PT_ESR |
| mfs r11, rfsr |
| swi r11, r1, PT_FSR |
| /* reload original stack pointer and save it */ |
| lwi r11, r0, PER_CPU(ENTRY_SP) |
| swi r11, r1, PT_R1 |
| /* update mode indicator we are in kernel mode */ |
| addik r11, r0, 1 |
| swi r11, r0, PER_CPU(KM) |
| /* restore r31 */ |
| lwi r31, r0, PER_CPU(CURRENT_SAVE) |
| /* re-enable interrupts now we are in kernel mode */ |
| enable_irq |
| |
| addi r5, r0, SIGTRAP /* sending the trap signal */ |
| add r6, r0, r31 /* to current */ |
| bralid r15, send_sig |
| add r7, r0, r0 /* 3rd param zero */ |
| |
| addik r30, r0, 1 /* restarts allowed ??? */ |
| /* Restore r3/r4 to work around how ret_to_user works */ |
| lwi r3, r1, PT_R3 |
| lwi r4, r1, PT_R4 |
| bri ret_to_user |
| |
| ENTRY(_break) |
| bri 0 |
| |
| /* struct task_struct *_switch_to(struct thread_info *prev, |
| struct thread_info *next); */ |
| ENTRY(_switch_to) |
| /* prepare return value */ |
| addk r3, r0, r31 |
| |
| /* save registers in cpu_context */ |
| /* use r11 and r12, volatile registers, as temp register */ |
| addik r11, r5, TI_CPU_CONTEXT |
| swi r1, r11, CC_R1 |
| swi r2, r11, CC_R2 |
| /* skip volatile registers. |
| * they are saved on stack when we jumped to _switch_to() */ |
| /* dedicated registers */ |
| swi r13, r11, CC_R13 |
| swi r14, r11, CC_R14 |
| swi r15, r11, CC_R15 |
| swi r16, r11, CC_R16 |
| swi r17, r11, CC_R17 |
| swi r18, r11, CC_R18 |
| /* save non-volatile registers */ |
| swi r19, r11, CC_R19 |
| swi r20, r11, CC_R20 |
| swi r21, r11, CC_R21 |
| swi r22, r11, CC_R22 |
| swi r23, r11, CC_R23 |
| swi r24, r11, CC_R24 |
| swi r25, r11, CC_R25 |
| swi r26, r11, CC_R26 |
| swi r27, r11, CC_R27 |
| swi r28, r11, CC_R28 |
| swi r29, r11, CC_R29 |
| swi r30, r11, CC_R30 |
| /* special purpose registers */ |
| mfs r12, rmsr |
| swi r12, r11, CC_MSR |
| mfs r12, rear |
| swi r12, r11, CC_EAR |
| mfs r12, resr |
| swi r12, r11, CC_ESR |
| mfs r12, rfsr |
| swi r12, r11, CC_FSR |
| |
| /* update r31, the current */ |
| lwi r31, r6, TI_TASK |
| swi r31, r0, PER_CPU(CURRENT_SAVE) |
| |
| /* get new process' cpu context and restore */ |
| addik r11, r6, TI_CPU_CONTEXT |
| |
| /* special purpose registers */ |
| lwi r12, r11, CC_FSR |
| mts rfsr, r12 |
| lwi r12, r11, CC_ESR |
| mts resr, r12 |
| lwi r12, r11, CC_EAR |
| mts rear, r12 |
| lwi r12, r11, CC_MSR |
| mts rmsr, r12 |
| /* non-volatile registers */ |
| lwi r30, r11, CC_R30 |
| lwi r29, r11, CC_R29 |
| lwi r28, r11, CC_R28 |
| lwi r27, r11, CC_R27 |
| lwi r26, r11, CC_R26 |
| lwi r25, r11, CC_R25 |
| lwi r24, r11, CC_R24 |
| lwi r23, r11, CC_R23 |
| lwi r22, r11, CC_R22 |
| lwi r21, r11, CC_R21 |
| lwi r20, r11, CC_R20 |
| lwi r19, r11, CC_R19 |
| /* dedicated registers */ |
| lwi r18, r11, CC_R18 |
| lwi r17, r11, CC_R17 |
| lwi r16, r11, CC_R16 |
| lwi r15, r11, CC_R15 |
| lwi r14, r11, CC_R14 |
| lwi r13, r11, CC_R13 |
| /* skip volatile registers */ |
| lwi r2, r11, CC_R2 |
| lwi r1, r11, CC_R1 |
| |
| rtsd r15, 8 |
| nop |
| |
| ENTRY(ret_from_fork) |
| addk r5, r0, r3 |
| brlid r15, schedule_tail |
| nop |
| swi r31, r1, PT_R31 /* save r31 in user context. */ |
| /* will soon be restored to r31 in ret_to_user */ |
| addk r3, r0, r0 |
| brid ret_to_user |
| nop |
| |
| ENTRY(ret_from_kernel_thread) |
| brlid r15, schedule_tail |
| addk r5, r0, r3 |
| brald r15, r20 |
| addk r5, r0, r19 |
| brid ret_to_user |
| addk r3, r0, r0 |
| |
| work_pending: |
| lwi r11, r1, PT_MODE |
| bneid r11, 2f |
| 3: |
| enable_irq |
| andi r11, r19, _TIF_NEED_RESCHED |
| beqi r11, 1f |
| bralid r15, schedule |
| nop |
| bri 4f |
| 1: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME |
| beqi r11, no_work_pending |
| addk r5, r30, r0 |
| bralid r15, do_notify_resume |
| addik r6, r0, 1 |
| addk r30, r0, r0 /* no restarts from now on */ |
| 4: |
| disable_irq |
| lwi r6, r31, TS_THREAD_INFO /* get thread info */ |
| lwi r19, r6, TI_FLAGS /* get flags in thread info */ |
| bri 3b |
| |
| ENTRY(ret_to_user) |
| disable_irq |
| |
| swi r4, r1, PT_R4 /* return val */ |
| swi r3, r1, PT_R3 /* return val */ |
| |
| lwi r6, r31, TS_THREAD_INFO /* get thread info */ |
| lwi r19, r6, TI_FLAGS /* get flags in thread info */ |
| bnei r19, work_pending /* do an extra work if any bits are set */ |
| no_work_pending: |
| disable_irq |
| |
| 2: |
| /* save r31 */ |
| swi r31, r0, PER_CPU(CURRENT_SAVE) |
| /* save mode indicator */ |
| lwi r18, r1, PT_MODE |
| swi r18, r0, PER_CPU(KM) |
| //restore_context: |
| /* special purpose registers */ |
| lwi r18, r1, PT_FSR |
| mts rfsr, r18 |
| lwi r18, r1, PT_ESR |
| mts resr, r18 |
| lwi r18, r1, PT_EAR |
| mts rear, r18 |
| lwi r18, r1, PT_MSR |
| mts rmsr, r18 |
| |
| lwi r31, r1, PT_R31 |
| lwi r30, r1, PT_R30 |
| lwi r29, r1, PT_R29 |
| lwi r28, r1, PT_R28 |
| lwi r27, r1, PT_R27 |
| lwi r26, r1, PT_R26 |
| lwi r25, r1, PT_R25 |
| lwi r24, r1, PT_R24 |
| lwi r23, r1, PT_R23 |
| lwi r22, r1, PT_R22 |
| lwi r21, r1, PT_R21 |
| lwi r20, r1, PT_R20 |
| lwi r19, r1, PT_R19 |
| lwi r18, r1, PT_R18 |
| lwi r17, r1, PT_R17 |
| lwi r16, r1, PT_R16 |
| lwi r15, r1, PT_R15 |
| lwi r14, r1, PT_PC |
| lwi r13, r1, PT_R13 |
| lwi r12, r1, PT_R12 |
| lwi r11, r1, PT_R11 |
| lwi r10, r1, PT_R10 |
| lwi r9, r1, PT_R9 |
| lwi r8, r1, PT_R8 |
| lwi r7, r1, PT_R7 |
| lwi r6, r1, PT_R6 |
| lwi r5, r1, PT_R5 |
| lwi r4, r1, PT_R4 /* return val */ |
| lwi r3, r1, PT_R3 /* return val */ |
| lwi r2, r1, PT_R2 |
| lwi r1, r1, PT_R1 |
| |
| rtid r14, 0 |
| nop |
| |
| sys_rt_sigreturn_wrapper: |
| addk r30, r0, r0 /* no restarts for this one */ |
| brid sys_rt_sigreturn |
| addk r5, r1, r0 |
| |
| /* Interrupt vector table */ |
| .section .init.ivt, "ax" |
| .org 0x0 |
| brai _reset |
| brai _user_exception |
| brai _interrupt |
| brai _break |
| brai _hw_exception_handler |
| .org 0x60 |
| brai _debug_exception |
| |
| .section .rodata,"a" |
| #include "syscall_table.S" |
| |
| syscall_table_size=(.-sys_call_table) |
| |
| type_SYSCALL: |
| .ascii "SYSCALL\0" |
| type_IRQ: |
| .ascii "IRQ\0" |
| type_IRQ_PREEMPT: |
| .ascii "IRQ (PREEMPTED)\0" |
| type_SYSCALL_PREEMPT: |
| .ascii " SYSCALL (PREEMPTED)\0" |
| |
| /* |
| * Trap decoding for stack unwinder |
| * Tuples are (start addr, end addr, string) |
| * If return address lies on [start addr, end addr], |
| * unwinder displays 'string' |
| */ |
| |
| .align 4 |
| .global microblaze_trap_handlers |
| microblaze_trap_handlers: |
| /* Exact matches come first */ |
| .word ret_to_user ; .word ret_to_user ; .word type_SYSCALL |
| .word ret_from_intr; .word ret_from_intr ; .word type_IRQ |
| /* Fuzzy matches go here */ |
| .word ret_from_intr; .word no_intr_resched; .word type_IRQ_PREEMPT |
| .word work_pending ; .word no_work_pending; .word type_SYSCALL_PREEMPT |
| /* End of table */ |
| .word 0 ; .word 0 ; .word 0 |
