1690 lines
52 KiB
ArmAsm
1690 lines
52 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* arch/ia64/kernel/ivt.S
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*
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* Copyright (C) 1998-2001, 2003, 2005 Hewlett-Packard Co
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* Stephane Eranian <eranian@hpl.hp.com>
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* David Mosberger <davidm@hpl.hp.com>
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* Copyright (C) 2000, 2002-2003 Intel Co
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* Asit Mallick <asit.k.mallick@intel.com>
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* Suresh Siddha <suresh.b.siddha@intel.com>
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* Kenneth Chen <kenneth.w.chen@intel.com>
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* Fenghua Yu <fenghua.yu@intel.com>
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*
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* 00/08/23 Asit Mallick <asit.k.mallick@intel.com> TLB handling for SMP
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* 00/12/20 David Mosberger-Tang <davidm@hpl.hp.com> DTLB/ITLB handler now uses virtual PT.
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*
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* Copyright (C) 2005 Hewlett-Packard Co
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* Dan Magenheimer <dan.magenheimer@hp.com>
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* Xen paravirtualization
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* Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
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* VA Linux Systems Japan K.K.
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* pv_ops.
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* Yaozu (Eddie) Dong <eddie.dong@intel.com>
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*/
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/*
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* This file defines the interruption vector table used by the CPU.
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* It does not include one entry per possible cause of interruption.
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*
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* The first 20 entries of the table contain 64 bundles each while the
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* remaining 48 entries contain only 16 bundles each.
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*
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* The 64 bundles are used to allow inlining the whole handler for critical
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* interruptions like TLB misses.
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*
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* For each entry, the comment is as follows:
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*
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* // 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
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* entry offset ----/ / / / /
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* entry number ---------/ / / /
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* size of the entry -------------/ / /
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* vector name -------------------------------------/ /
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* interruptions triggering this vector ----------------------/
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*
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* The table is 32KB in size and must be aligned on 32KB boundary.
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* (The CPU ignores the 15 lower bits of the address)
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*
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* Table is based upon EAS2.6 (Oct 1999)
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*/
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#include <asm/asmmacro.h>
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#include <asm/break.h>
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#include <asm/kregs.h>
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#include <asm/asm-offsets.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/ptrace.h>
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#include <asm/thread_info.h>
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#include <asm/unistd.h>
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#include <asm/errno.h>
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#include <asm/export.h>
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#if 0
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# define PSR_DEFAULT_BITS psr.ac
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#else
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# define PSR_DEFAULT_BITS 0
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#endif
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#if 0
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/*
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* This lets you track the last eight faults that occurred on the CPU. Make sure ar.k2 isn't
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* needed for something else before enabling this...
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*/
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# define DBG_FAULT(i) mov r16=ar.k2;; shl r16=r16,8;; add r16=(i),r16;;mov ar.k2=r16
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#else
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# define DBG_FAULT(i)
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#endif
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#include "minstate.h"
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#define FAULT(n) \
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mov r31=pr; \
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mov r19=n;; /* prepare to save predicates */ \
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br.sptk.many dispatch_to_fault_handler
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.section .text..ivt,"ax"
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.align 32768 // align on 32KB boundary
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.global ia64_ivt
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EXPORT_DATA_SYMBOL(ia64_ivt)
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ia64_ivt:
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/////////////////////////////////////////////////////////////////////////////////////////
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// 0x0000 Entry 0 (size 64 bundles) VHPT Translation (8,20,47)
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ENTRY(vhpt_miss)
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DBG_FAULT(0)
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/*
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* The VHPT vector is invoked when the TLB entry for the virtual page table
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* is missing. This happens only as a result of a previous
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* (the "original") TLB miss, which may either be caused by an instruction
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* fetch or a data access (or non-access).
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*
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* What we do here is normal TLB miss handing for the _original_ miss,
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* followed by inserting the TLB entry for the virtual page table page
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* that the VHPT walker was attempting to access. The latter gets
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* inserted as long as page table entry above pte level have valid
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* mappings for the faulting address. The TLB entry for the original
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* miss gets inserted only if the pte entry indicates that the page is
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* present.
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*
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* do_page_fault gets invoked in the following cases:
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* - the faulting virtual address uses unimplemented address bits
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* - the faulting virtual address has no valid page table mapping
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*/
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MOV_FROM_IFA(r16) // get address that caused the TLB miss
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#ifdef CONFIG_HUGETLB_PAGE
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movl r18=PAGE_SHIFT
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MOV_FROM_ITIR(r25)
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#endif
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;;
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RSM_PSR_DT // use physical addressing for data
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mov r31=pr // save the predicate registers
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mov r19=IA64_KR(PT_BASE) // get page table base address
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shl r21=r16,3 // shift bit 60 into sign bit
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shr.u r17=r16,61 // get the region number into r17
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;;
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shr.u r22=r21,3
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#ifdef CONFIG_HUGETLB_PAGE
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extr.u r26=r25,2,6
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;;
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cmp.ne p8,p0=r18,r26
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sub r27=r26,r18
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;;
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(p8) dep r25=r18,r25,2,6
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(p8) shr r22=r22,r27
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#endif
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;;
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cmp.eq p6,p7=5,r17 // is IFA pointing into to region 5?
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shr.u r18=r22,PGDIR_SHIFT // get bottom portion of pgd index bit
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;;
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(p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place
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srlz.d
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LOAD_PHYSICAL(p6, r19, swapper_pg_dir) // region 5 is rooted at swapper_pg_dir
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.pred.rel "mutex", p6, p7
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(p6) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
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(p7) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
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;;
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(p6) dep r17=r18,r19,3,(PAGE_SHIFT-3) // r17=pgd_offset for region 5
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(p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=pgd_offset for region[0-4]
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cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
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#if CONFIG_PGTABLE_LEVELS == 4
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shr.u r28=r22,PUD_SHIFT // shift pud index into position
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#else
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shr.u r18=r22,PMD_SHIFT // shift pmd index into position
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#endif
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;;
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ld8 r17=[r17] // get *pgd (may be 0)
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;;
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(p7) cmp.eq p6,p7=r17,r0 // was pgd_present(*pgd) == NULL?
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#if CONFIG_PGTABLE_LEVELS == 4
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dep r28=r28,r17,3,(PAGE_SHIFT-3) // r28=pud_offset(pgd,addr)
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;;
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shr.u r18=r22,PMD_SHIFT // shift pmd index into position
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(p7) ld8 r29=[r28] // get *pud (may be 0)
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;;
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(p7) cmp.eq.or.andcm p6,p7=r29,r0 // was pud_present(*pud) == NULL?
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dep r17=r18,r29,3,(PAGE_SHIFT-3) // r17=pmd_offset(pud,addr)
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#else
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dep r17=r18,r17,3,(PAGE_SHIFT-3) // r17=pmd_offset(pgd,addr)
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#endif
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;;
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(p7) ld8 r20=[r17] // get *pmd (may be 0)
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shr.u r19=r22,PAGE_SHIFT // shift pte index into position
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;;
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(p7) cmp.eq.or.andcm p6,p7=r20,r0 // was pmd_present(*pmd) == NULL?
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dep r21=r19,r20,3,(PAGE_SHIFT-3) // r21=pte_offset(pmd,addr)
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;;
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(p7) ld8 r18=[r21] // read *pte
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MOV_FROM_ISR(r19) // cr.isr bit 32 tells us if this is an insn miss
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;;
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(p7) tbit.z p6,p7=r18,_PAGE_P_BIT // page present bit cleared?
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MOV_FROM_IHA(r22) // get the VHPT address that caused the TLB miss
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;; // avoid RAW on p7
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(p7) tbit.nz.unc p10,p11=r19,32 // is it an instruction TLB miss?
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dep r23=0,r20,0,PAGE_SHIFT // clear low bits to get page address
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;;
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ITC_I_AND_D(p10, p11, r18, r24) // insert the instruction TLB entry and
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// insert the data TLB entry
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(p6) br.cond.spnt.many page_fault // handle bad address/page not present (page fault)
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MOV_TO_IFA(r22, r24)
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#ifdef CONFIG_HUGETLB_PAGE
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MOV_TO_ITIR(p8, r25, r24) // change to default page-size for VHPT
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#endif
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/*
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* Now compute and insert the TLB entry for the virtual page table. We never
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* execute in a page table page so there is no need to set the exception deferral
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* bit.
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*/
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adds r24=__DIRTY_BITS_NO_ED|_PAGE_PL_0|_PAGE_AR_RW,r23
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;;
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ITC_D(p7, r24, r25)
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;;
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#ifdef CONFIG_SMP
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/*
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* Tell the assemblers dependency-violation checker that the above "itc" instructions
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* cannot possibly affect the following loads:
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*/
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dv_serialize_data
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/*
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* Re-check pagetable entry. If they changed, we may have received a ptc.g
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* between reading the pagetable and the "itc". If so, flush the entry we
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* inserted and retry. At this point, we have:
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*
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* r28 = equivalent of pud_offset(pgd, ifa)
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* r17 = equivalent of pmd_offset(pud, ifa)
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* r21 = equivalent of pte_offset(pmd, ifa)
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*
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* r29 = *pud
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* r20 = *pmd
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* r18 = *pte
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*/
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ld8 r25=[r21] // read *pte again
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ld8 r26=[r17] // read *pmd again
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#if CONFIG_PGTABLE_LEVELS == 4
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ld8 r19=[r28] // read *pud again
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#endif
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cmp.ne p6,p7=r0,r0
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;;
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cmp.ne.or.andcm p6,p7=r26,r20 // did *pmd change
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#if CONFIG_PGTABLE_LEVELS == 4
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cmp.ne.or.andcm p6,p7=r19,r29 // did *pud change
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#endif
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mov r27=PAGE_SHIFT<<2
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;;
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(p6) ptc.l r22,r27 // purge PTE page translation
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(p7) cmp.ne.or.andcm p6,p7=r25,r18 // did *pte change
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;;
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(p6) ptc.l r16,r27 // purge translation
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#endif
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mov pr=r31,-1 // restore predicate registers
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RFI
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END(vhpt_miss)
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.org ia64_ivt+0x400
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/////////////////////////////////////////////////////////////////////////////////////////
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// 0x0400 Entry 1 (size 64 bundles) ITLB (21)
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ENTRY(itlb_miss)
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DBG_FAULT(1)
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/*
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* The ITLB handler accesses the PTE via the virtually mapped linear
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* page table. If a nested TLB miss occurs, we switch into physical
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* mode, walk the page table, and then re-execute the PTE read and
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* go on normally after that.
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*/
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MOV_FROM_IFA(r16) // get virtual address
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mov r29=b0 // save b0
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mov r31=pr // save predicates
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.itlb_fault:
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MOV_FROM_IHA(r17) // get virtual address of PTE
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movl r30=1f // load nested fault continuation point
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;;
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1: ld8 r18=[r17] // read *pte
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;;
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mov b0=r29
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tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
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(p6) br.cond.spnt page_fault
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;;
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ITC_I(p0, r18, r19)
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;;
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#ifdef CONFIG_SMP
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/*
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* Tell the assemblers dependency-violation checker that the above "itc" instructions
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* cannot possibly affect the following loads:
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*/
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dv_serialize_data
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ld8 r19=[r17] // read *pte again and see if same
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mov r20=PAGE_SHIFT<<2 // setup page size for purge
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;;
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cmp.ne p7,p0=r18,r19
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;;
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(p7) ptc.l r16,r20
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#endif
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mov pr=r31,-1
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RFI
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END(itlb_miss)
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.org ia64_ivt+0x0800
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/////////////////////////////////////////////////////////////////////////////////////////
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// 0x0800 Entry 2 (size 64 bundles) DTLB (9,48)
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ENTRY(dtlb_miss)
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DBG_FAULT(2)
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/*
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* The DTLB handler accesses the PTE via the virtually mapped linear
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* page table. If a nested TLB miss occurs, we switch into physical
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* mode, walk the page table, and then re-execute the PTE read and
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* go on normally after that.
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*/
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MOV_FROM_IFA(r16) // get virtual address
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mov r29=b0 // save b0
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mov r31=pr // save predicates
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dtlb_fault:
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MOV_FROM_IHA(r17) // get virtual address of PTE
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movl r30=1f // load nested fault continuation point
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;;
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1: ld8 r18=[r17] // read *pte
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;;
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mov b0=r29
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tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
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(p6) br.cond.spnt page_fault
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;;
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ITC_D(p0, r18, r19)
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;;
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#ifdef CONFIG_SMP
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/*
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* Tell the assemblers dependency-violation checker that the above "itc" instructions
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* cannot possibly affect the following loads:
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*/
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dv_serialize_data
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ld8 r19=[r17] // read *pte again and see if same
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mov r20=PAGE_SHIFT<<2 // setup page size for purge
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;;
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cmp.ne p7,p0=r18,r19
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;;
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(p7) ptc.l r16,r20
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#endif
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mov pr=r31,-1
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RFI
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END(dtlb_miss)
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.org ia64_ivt+0x0c00
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/////////////////////////////////////////////////////////////////////////////////////////
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// 0x0c00 Entry 3 (size 64 bundles) Alt ITLB (19)
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ENTRY(alt_itlb_miss)
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DBG_FAULT(3)
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MOV_FROM_IFA(r16) // get address that caused the TLB miss
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movl r17=PAGE_KERNEL
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MOV_FROM_IPSR(p0, r21)
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movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
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mov r31=pr
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;;
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#ifdef CONFIG_DISABLE_VHPT
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shr.u r22=r16,61 // get the region number into r21
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;;
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cmp.gt p8,p0=6,r22 // user mode
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;;
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THASH(p8, r17, r16, r23)
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;;
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MOV_TO_IHA(p8, r17, r23)
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(p8) mov r29=b0 // save b0
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(p8) br.cond.dptk .itlb_fault
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#endif
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extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
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and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
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shr.u r18=r16,57 // move address bit 61 to bit 4
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;;
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andcm r18=0x10,r18 // bit 4=~address-bit(61)
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cmp.ne p8,p0=r0,r23 // psr.cpl != 0?
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or r19=r17,r19 // insert PTE control bits into r19
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;;
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or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
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(p8) br.cond.spnt page_fault
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;;
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ITC_I(p0, r19, r18) // insert the TLB entry
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mov pr=r31,-1
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RFI
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END(alt_itlb_miss)
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.org ia64_ivt+0x1000
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/////////////////////////////////////////////////////////////////////////////////////////
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// 0x1000 Entry 4 (size 64 bundles) Alt DTLB (7,46)
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ENTRY(alt_dtlb_miss)
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DBG_FAULT(4)
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MOV_FROM_IFA(r16) // get address that caused the TLB miss
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movl r17=PAGE_KERNEL
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MOV_FROM_ISR(r20)
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movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
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MOV_FROM_IPSR(p0, r21)
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mov r31=pr
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mov r24=PERCPU_ADDR
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;;
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#ifdef CONFIG_DISABLE_VHPT
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shr.u r22=r16,61 // get the region number into r21
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;;
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cmp.gt p8,p0=6,r22 // access to region 0-5
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;;
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THASH(p8, r17, r16, r25)
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;;
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MOV_TO_IHA(p8, r17, r25)
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(p8) mov r29=b0 // save b0
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(p8) br.cond.dptk dtlb_fault
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#endif
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cmp.ge p10,p11=r16,r24 // access to per_cpu_data?
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tbit.z p12,p0=r16,61 // access to region 6?
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mov r25=PERCPU_PAGE_SHIFT << 2
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mov r26=PERCPU_PAGE_SIZE
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nop.m 0
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nop.b 0
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;;
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(p10) mov r19=IA64_KR(PER_CPU_DATA)
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(p11) and r19=r19,r16 // clear non-ppn fields
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extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
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and r22=IA64_ISR_CODE_MASK,r20 // get the isr.code field
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tbit.nz p6,p7=r20,IA64_ISR_SP_BIT // is speculation bit on?
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tbit.nz p9,p0=r20,IA64_ISR_NA_BIT // is non-access bit on?
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;;
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(p10) sub r19=r19,r26
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MOV_TO_ITIR(p10, r25, r24)
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cmp.ne p8,p0=r0,r23
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(p9) cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22 // check isr.code field
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(p12) dep r17=-1,r17,4,1 // set ma=UC for region 6 addr
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(p8) br.cond.spnt page_fault
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dep r21=-1,r21,IA64_PSR_ED_BIT,1
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;;
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or r19=r19,r17 // insert PTE control bits into r19
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MOV_TO_IPSR(p6, r21, r24)
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;;
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ITC_D(p7, r19, r18) // insert the TLB entry
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mov pr=r31,-1
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RFI
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END(alt_dtlb_miss)
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.org ia64_ivt+0x1400
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/////////////////////////////////////////////////////////////////////////////////////////
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// 0x1400 Entry 5 (size 64 bundles) Data nested TLB (6,45)
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ENTRY(nested_dtlb_miss)
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/*
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* In the absence of kernel bugs, we get here when the virtually mapped linear
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* page table is accessed non-speculatively (e.g., in the Dirty-bit, Instruction
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* Access-bit, or Data Access-bit faults). If the DTLB entry for the virtual page
|
|
* table is missing, a nested TLB miss fault is triggered and control is
|
|
* transferred to this point. When this happens, we lookup the pte for the
|
|
* faulting address by walking the page table in physical mode and return to the
|
|
* continuation point passed in register r30 (or call page_fault if the address is
|
|
* not mapped).
|
|
*
|
|
* Input: r16: faulting address
|
|
* r29: saved b0
|
|
* r30: continuation address
|
|
* r31: saved pr
|
|
*
|
|
* Output: r17: physical address of PTE of faulting address
|
|
* r29: saved b0
|
|
* r30: continuation address
|
|
* r31: saved pr
|
|
*
|
|
* Clobbered: b0, r18, r19, r21, r22, psr.dt (cleared)
|
|
*/
|
|
RSM_PSR_DT // switch to using physical data addressing
|
|
mov r19=IA64_KR(PT_BASE) // get the page table base address
|
|
shl r21=r16,3 // shift bit 60 into sign bit
|
|
MOV_FROM_ITIR(r18)
|
|
;;
|
|
shr.u r17=r16,61 // get the region number into r17
|
|
extr.u r18=r18,2,6 // get the faulting page size
|
|
;;
|
|
cmp.eq p6,p7=5,r17 // is faulting address in region 5?
|
|
add r22=-PAGE_SHIFT,r18 // adjustment for hugetlb address
|
|
add r18=PGDIR_SHIFT-PAGE_SHIFT,r18
|
|
;;
|
|
shr.u r22=r16,r22
|
|
shr.u r18=r16,r18
|
|
(p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place
|
|
|
|
srlz.d
|
|
LOAD_PHYSICAL(p6, r19, swapper_pg_dir) // region 5 is rooted at swapper_pg_dir
|
|
|
|
.pred.rel "mutex", p6, p7
|
|
(p6) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
|
|
(p7) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
|
|
;;
|
|
(p6) dep r17=r18,r19,3,(PAGE_SHIFT-3) // r17=pgd_offset for region 5
|
|
(p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=pgd_offset for region[0-4]
|
|
cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
|
|
#if CONFIG_PGTABLE_LEVELS == 4
|
|
shr.u r18=r22,PUD_SHIFT // shift pud index into position
|
|
#else
|
|
shr.u r18=r22,PMD_SHIFT // shift pmd index into position
|
|
#endif
|
|
;;
|
|
ld8 r17=[r17] // get *pgd (may be 0)
|
|
;;
|
|
(p7) cmp.eq p6,p7=r17,r0 // was pgd_present(*pgd) == NULL?
|
|
dep r17=r18,r17,3,(PAGE_SHIFT-3) // r17=p[u|m]d_offset(pgd,addr)
|
|
;;
|
|
#if CONFIG_PGTABLE_LEVELS == 4
|
|
(p7) ld8 r17=[r17] // get *pud (may be 0)
|
|
shr.u r18=r22,PMD_SHIFT // shift pmd index into position
|
|
;;
|
|
(p7) cmp.eq.or.andcm p6,p7=r17,r0 // was pud_present(*pud) == NULL?
|
|
dep r17=r18,r17,3,(PAGE_SHIFT-3) // r17=pmd_offset(pud,addr)
|
|
;;
|
|
#endif
|
|
(p7) ld8 r17=[r17] // get *pmd (may be 0)
|
|
shr.u r19=r22,PAGE_SHIFT // shift pte index into position
|
|
;;
|
|
(p7) cmp.eq.or.andcm p6,p7=r17,r0 // was pmd_present(*pmd) == NULL?
|
|
dep r17=r19,r17,3,(PAGE_SHIFT-3) // r17=pte_offset(pmd,addr);
|
|
(p6) br.cond.spnt page_fault
|
|
mov b0=r30
|
|
br.sptk.many b0 // return to continuation point
|
|
END(nested_dtlb_miss)
|
|
|
|
.org ia64_ivt+0x1800
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x1800 Entry 6 (size 64 bundles) Instruction Key Miss (24)
|
|
ENTRY(ikey_miss)
|
|
DBG_FAULT(6)
|
|
FAULT(6)
|
|
END(ikey_miss)
|
|
|
|
.org ia64_ivt+0x1c00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
|
|
ENTRY(dkey_miss)
|
|
DBG_FAULT(7)
|
|
FAULT(7)
|
|
END(dkey_miss)
|
|
|
|
.org ia64_ivt+0x2000
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x2000 Entry 8 (size 64 bundles) Dirty-bit (54)
|
|
ENTRY(dirty_bit)
|
|
DBG_FAULT(8)
|
|
/*
|
|
* What we do here is to simply turn on the dirty bit in the PTE. We need to
|
|
* update both the page-table and the TLB entry. To efficiently access the PTE,
|
|
* we address it through the virtual page table. Most likely, the TLB entry for
|
|
* the relevant virtual page table page is still present in the TLB so we can
|
|
* normally do this without additional TLB misses. In case the necessary virtual
|
|
* page table TLB entry isn't present, we take a nested TLB miss hit where we look
|
|
* up the physical address of the L3 PTE and then continue at label 1 below.
|
|
*/
|
|
MOV_FROM_IFA(r16) // get the address that caused the fault
|
|
movl r30=1f // load continuation point in case of nested fault
|
|
;;
|
|
THASH(p0, r17, r16, r18) // compute virtual address of L3 PTE
|
|
mov r29=b0 // save b0 in case of nested fault
|
|
mov r31=pr // save pr
|
|
#ifdef CONFIG_SMP
|
|
mov r28=ar.ccv // save ar.ccv
|
|
;;
|
|
1: ld8 r18=[r17]
|
|
;; // avoid RAW on r18
|
|
mov ar.ccv=r18 // set compare value for cmpxchg
|
|
or r25=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
|
|
tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
|
|
;;
|
|
(p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only update if page is present
|
|
mov r24=PAGE_SHIFT<<2
|
|
;;
|
|
(p6) cmp.eq p6,p7=r26,r18 // Only compare if page is present
|
|
;;
|
|
ITC_D(p6, r25, r18) // install updated PTE
|
|
;;
|
|
/*
|
|
* Tell the assemblers dependency-violation checker that the above "itc" instructions
|
|
* cannot possibly affect the following loads:
|
|
*/
|
|
dv_serialize_data
|
|
|
|
ld8 r18=[r17] // read PTE again
|
|
;;
|
|
cmp.eq p6,p7=r18,r25 // is it same as the newly installed
|
|
;;
|
|
(p7) ptc.l r16,r24
|
|
mov b0=r29 // restore b0
|
|
mov ar.ccv=r28
|
|
#else
|
|
;;
|
|
1: ld8 r18=[r17]
|
|
;; // avoid RAW on r18
|
|
or r18=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
|
|
mov b0=r29 // restore b0
|
|
;;
|
|
st8 [r17]=r18 // store back updated PTE
|
|
ITC_D(p0, r18, r16) // install updated PTE
|
|
#endif
|
|
mov pr=r31,-1 // restore pr
|
|
RFI
|
|
END(dirty_bit)
|
|
|
|
.org ia64_ivt+0x2400
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x2400 Entry 9 (size 64 bundles) Instruction Access-bit (27)
|
|
ENTRY(iaccess_bit)
|
|
DBG_FAULT(9)
|
|
// Like Entry 8, except for instruction access
|
|
MOV_FROM_IFA(r16) // get the address that caused the fault
|
|
movl r30=1f // load continuation point in case of nested fault
|
|
mov r31=pr // save predicates
|
|
#ifdef CONFIG_ITANIUM
|
|
/*
|
|
* Erratum 10 (IFA may contain incorrect address) has "NoFix" status.
|
|
*/
|
|
MOV_FROM_IPSR(p0, r17)
|
|
;;
|
|
MOV_FROM_IIP(r18)
|
|
tbit.z p6,p0=r17,IA64_PSR_IS_BIT // IA64 instruction set?
|
|
;;
|
|
(p6) mov r16=r18 // if so, use cr.iip instead of cr.ifa
|
|
#endif /* CONFIG_ITANIUM */
|
|
;;
|
|
THASH(p0, r17, r16, r18) // compute virtual address of L3 PTE
|
|
mov r29=b0 // save b0 in case of nested fault)
|
|
#ifdef CONFIG_SMP
|
|
mov r28=ar.ccv // save ar.ccv
|
|
;;
|
|
1: ld8 r18=[r17]
|
|
;;
|
|
mov ar.ccv=r18 // set compare value for cmpxchg
|
|
or r25=_PAGE_A,r18 // set the accessed bit
|
|
tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
|
|
;;
|
|
(p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only if page present
|
|
mov r24=PAGE_SHIFT<<2
|
|
;;
|
|
(p6) cmp.eq p6,p7=r26,r18 // Only if page present
|
|
;;
|
|
ITC_I(p6, r25, r26) // install updated PTE
|
|
;;
|
|
/*
|
|
* Tell the assemblers dependency-violation checker that the above "itc" instructions
|
|
* cannot possibly affect the following loads:
|
|
*/
|
|
dv_serialize_data
|
|
|
|
ld8 r18=[r17] // read PTE again
|
|
;;
|
|
cmp.eq p6,p7=r18,r25 // is it same as the newly installed
|
|
;;
|
|
(p7) ptc.l r16,r24
|
|
mov b0=r29 // restore b0
|
|
mov ar.ccv=r28
|
|
#else /* !CONFIG_SMP */
|
|
;;
|
|
1: ld8 r18=[r17]
|
|
;;
|
|
or r18=_PAGE_A,r18 // set the accessed bit
|
|
mov b0=r29 // restore b0
|
|
;;
|
|
st8 [r17]=r18 // store back updated PTE
|
|
ITC_I(p0, r18, r16) // install updated PTE
|
|
#endif /* !CONFIG_SMP */
|
|
mov pr=r31,-1
|
|
RFI
|
|
END(iaccess_bit)
|
|
|
|
.org ia64_ivt+0x2800
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x2800 Entry 10 (size 64 bundles) Data Access-bit (15,55)
|
|
ENTRY(daccess_bit)
|
|
DBG_FAULT(10)
|
|
// Like Entry 8, except for data access
|
|
MOV_FROM_IFA(r16) // get the address that caused the fault
|
|
movl r30=1f // load continuation point in case of nested fault
|
|
;;
|
|
THASH(p0, r17, r16, r18) // compute virtual address of L3 PTE
|
|
mov r31=pr
|
|
mov r29=b0 // save b0 in case of nested fault)
|
|
#ifdef CONFIG_SMP
|
|
mov r28=ar.ccv // save ar.ccv
|
|
;;
|
|
1: ld8 r18=[r17]
|
|
;; // avoid RAW on r18
|
|
mov ar.ccv=r18 // set compare value for cmpxchg
|
|
or r25=_PAGE_A,r18 // set the dirty bit
|
|
tbit.z p7,p6 = r18,_PAGE_P_BIT // Check present bit
|
|
;;
|
|
(p6) cmpxchg8.acq r26=[r17],r25,ar.ccv // Only if page is present
|
|
mov r24=PAGE_SHIFT<<2
|
|
;;
|
|
(p6) cmp.eq p6,p7=r26,r18 // Only if page is present
|
|
;;
|
|
ITC_D(p6, r25, r26) // install updated PTE
|
|
/*
|
|
* Tell the assemblers dependency-violation checker that the above "itc" instructions
|
|
* cannot possibly affect the following loads:
|
|
*/
|
|
dv_serialize_data
|
|
;;
|
|
ld8 r18=[r17] // read PTE again
|
|
;;
|
|
cmp.eq p6,p7=r18,r25 // is it same as the newly installed
|
|
;;
|
|
(p7) ptc.l r16,r24
|
|
mov ar.ccv=r28
|
|
#else
|
|
;;
|
|
1: ld8 r18=[r17]
|
|
;; // avoid RAW on r18
|
|
or r18=_PAGE_A,r18 // set the accessed bit
|
|
;;
|
|
st8 [r17]=r18 // store back updated PTE
|
|
ITC_D(p0, r18, r16) // install updated PTE
|
|
#endif
|
|
mov b0=r29 // restore b0
|
|
mov pr=r31,-1
|
|
RFI
|
|
END(daccess_bit)
|
|
|
|
.org ia64_ivt+0x2c00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x2c00 Entry 11 (size 64 bundles) Break instruction (33)
|
|
ENTRY(break_fault)
|
|
/*
|
|
* The streamlined system call entry/exit paths only save/restore the initial part
|
|
* of pt_regs. This implies that the callers of system-calls must adhere to the
|
|
* normal procedure calling conventions.
|
|
*
|
|
* Registers to be saved & restored:
|
|
* CR registers: cr.ipsr, cr.iip, cr.ifs
|
|
* AR registers: ar.unat, ar.pfs, ar.rsc, ar.rnat, ar.bspstore, ar.fpsr
|
|
* others: pr, b0, b6, loadrs, r1, r11, r12, r13, r15
|
|
* Registers to be restored only:
|
|
* r8-r11: output value from the system call.
|
|
*
|
|
* During system call exit, scratch registers (including r15) are modified/cleared
|
|
* to prevent leaking bits from kernel to user level.
|
|
*/
|
|
DBG_FAULT(11)
|
|
mov.m r16=IA64_KR(CURRENT) // M2 r16 <- current task (12 cyc)
|
|
MOV_FROM_IPSR(p0, r29) // M2 (12 cyc)
|
|
mov r31=pr // I0 (2 cyc)
|
|
|
|
MOV_FROM_IIM(r17) // M2 (2 cyc)
|
|
mov.m r27=ar.rsc // M2 (12 cyc)
|
|
mov r18=__IA64_BREAK_SYSCALL // A
|
|
|
|
mov.m ar.rsc=0 // M2
|
|
mov.m r21=ar.fpsr // M2 (12 cyc)
|
|
mov r19=b6 // I0 (2 cyc)
|
|
;;
|
|
mov.m r23=ar.bspstore // M2 (12 cyc)
|
|
mov.m r24=ar.rnat // M2 (5 cyc)
|
|
mov.i r26=ar.pfs // I0 (2 cyc)
|
|
|
|
invala // M0|1
|
|
nop.m 0 // M
|
|
mov r20=r1 // A save r1
|
|
|
|
nop.m 0
|
|
movl r30=sys_call_table // X
|
|
|
|
MOV_FROM_IIP(r28) // M2 (2 cyc)
|
|
cmp.eq p0,p7=r18,r17 // I0 is this a system call?
|
|
(p7) br.cond.spnt non_syscall // B no ->
|
|
//
|
|
// From this point on, we are definitely on the syscall-path
|
|
// and we can use (non-banked) scratch registers.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////
|
|
mov r1=r16 // A move task-pointer to "addl"-addressable reg
|
|
mov r2=r16 // A setup r2 for ia64_syscall_setup
|
|
add r9=TI_FLAGS+IA64_TASK_SIZE,r16 // A r9 = ¤t_thread_info()->flags
|
|
|
|
adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16
|
|
adds r15=-1024,r15 // A subtract 1024 from syscall number
|
|
mov r3=NR_syscalls - 1
|
|
;;
|
|
ld1.bias r17=[r16] // M0|1 r17 = current->thread.on_ustack flag
|
|
ld4 r9=[r9] // M0|1 r9 = current_thread_info()->flags
|
|
extr.u r8=r29,41,2 // I0 extract ei field from cr.ipsr
|
|
|
|
shladd r30=r15,3,r30 // A r30 = sys_call_table + 8*(syscall-1024)
|
|
addl r22=IA64_RBS_OFFSET,r1 // A compute base of RBS
|
|
cmp.leu p6,p7=r15,r3 // A syscall number in range?
|
|
;;
|
|
|
|
lfetch.fault.excl.nt1 [r22] // M0|1 prefetch RBS
|
|
(p6) ld8 r30=[r30] // M0|1 load address of syscall entry point
|
|
tnat.nz.or p7,p0=r15 // I0 is syscall nr a NaT?
|
|
|
|
mov.m ar.bspstore=r22 // M2 switch to kernel RBS
|
|
cmp.eq p8,p9=2,r8 // A isr.ei==2?
|
|
;;
|
|
|
|
(p8) mov r8=0 // A clear ei to 0
|
|
(p7) movl r30=sys_ni_syscall // X
|
|
|
|
(p8) adds r28=16,r28 // A switch cr.iip to next bundle
|
|
(p9) adds r8=1,r8 // A increment ei to next slot
|
|
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
|
|
;;
|
|
mov b6=r30 // I0 setup syscall handler branch reg early
|
|
#else
|
|
nop.i 0
|
|
;;
|
|
#endif
|
|
|
|
mov.m r25=ar.unat // M2 (5 cyc)
|
|
dep r29=r8,r29,41,2 // I0 insert new ei into cr.ipsr
|
|
adds r15=1024,r15 // A restore original syscall number
|
|
//
|
|
// If any of the above loads miss in L1D, we'll stall here until
|
|
// the data arrives.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////
|
|
st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag
|
|
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
|
|
MOV_FROM_ITC(p0, p14, r30, r18) // M get cycle for accounting
|
|
#else
|
|
mov b6=r30 // I0 setup syscall handler branch reg early
|
|
#endif
|
|
cmp.eq pKStk,pUStk=r0,r17 // A were we on kernel stacks already?
|
|
|
|
and r9=_TIF_SYSCALL_TRACEAUDIT,r9 // A mask trace or audit
|
|
mov r18=ar.bsp // M2 (12 cyc)
|
|
(pKStk) br.cond.spnt .break_fixup // B we're already in kernel-mode -- fix up RBS
|
|
;;
|
|
.back_from_break_fixup:
|
|
(pUStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1 // A compute base of memory stack
|
|
cmp.eq p14,p0=r9,r0 // A are syscalls being traced/audited?
|
|
br.call.sptk.many b7=ia64_syscall_setup // B
|
|
1:
|
|
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
|
|
// mov.m r30=ar.itc is called in advance, and r13 is current
|
|
add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13 // A
|
|
add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13 // A
|
|
(pKStk) br.cond.spnt .skip_accounting // B unlikely skip
|
|
;;
|
|
ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // M get last stamp
|
|
ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // M time at leave
|
|
;;
|
|
ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME // M cumulated stime
|
|
ld8 r21=[r17] // M cumulated utime
|
|
sub r22=r19,r18 // A stime before leave
|
|
;;
|
|
st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP // M update stamp
|
|
sub r18=r30,r19 // A elapsed time in user
|
|
;;
|
|
add r20=r20,r22 // A sum stime
|
|
add r21=r21,r18 // A sum utime
|
|
;;
|
|
st8 [r16]=r20 // M update stime
|
|
st8 [r17]=r21 // M update utime
|
|
;;
|
|
.skip_accounting:
|
|
#endif
|
|
mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0
|
|
nop 0
|
|
BSW_1(r2, r14) // B (6 cyc) regs are saved, switch to bank 1
|
|
;;
|
|
|
|
SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r16) // M2 now it's safe to re-enable intr.-collection
|
|
// M0 ensure interruption collection is on
|
|
movl r3=ia64_ret_from_syscall // X
|
|
;;
|
|
mov rp=r3 // I0 set the real return addr
|
|
(p10) br.cond.spnt.many ia64_ret_from_syscall // B return if bad call-frame or r15 is a NaT
|
|
|
|
SSM_PSR_I(p15, p15, r16) // M2 restore psr.i
|
|
(p14) br.call.sptk.many b6=b6 // B invoke syscall-handker (ignore return addr)
|
|
br.cond.spnt.many ia64_trace_syscall // B do syscall-tracing thingamagic
|
|
// NOT REACHED
|
|
///////////////////////////////////////////////////////////////////////
|
|
// On entry, we optimistically assumed that we're coming from user-space.
|
|
// For the rare cases where a system-call is done from within the kernel,
|
|
// we fix things up at this point:
|
|
.break_fixup:
|
|
add r1=-IA64_PT_REGS_SIZE,sp // A allocate space for pt_regs structure
|
|
mov ar.rnat=r24 // M2 restore kernel's AR.RNAT
|
|
;;
|
|
mov ar.bspstore=r23 // M2 restore kernel's AR.BSPSTORE
|
|
br.cond.sptk .back_from_break_fixup
|
|
END(break_fault)
|
|
|
|
.org ia64_ivt+0x3000
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x3000 Entry 12 (size 64 bundles) External Interrupt (4)
|
|
ENTRY(interrupt)
|
|
/* interrupt handler has become too big to fit this area. */
|
|
br.sptk.many __interrupt
|
|
END(interrupt)
|
|
|
|
.org ia64_ivt+0x3400
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x3400 Entry 13 (size 64 bundles) Reserved
|
|
DBG_FAULT(13)
|
|
FAULT(13)
|
|
|
|
.org ia64_ivt+0x3800
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x3800 Entry 14 (size 64 bundles) Reserved
|
|
DBG_FAULT(14)
|
|
FAULT(14)
|
|
|
|
/*
|
|
* There is no particular reason for this code to be here, other than that
|
|
* there happens to be space here that would go unused otherwise. If this
|
|
* fault ever gets "unreserved", simply moved the following code to a more
|
|
* suitable spot...
|
|
*
|
|
* ia64_syscall_setup() is a separate subroutine so that it can
|
|
* allocate stacked registers so it can safely demine any
|
|
* potential NaT values from the input registers.
|
|
*
|
|
* On entry:
|
|
* - executing on bank 0 or bank 1 register set (doesn't matter)
|
|
* - r1: stack pointer
|
|
* - r2: current task pointer
|
|
* - r3: preserved
|
|
* - r11: original contents (saved ar.pfs to be saved)
|
|
* - r12: original contents (sp to be saved)
|
|
* - r13: original contents (tp to be saved)
|
|
* - r15: original contents (syscall # to be saved)
|
|
* - r18: saved bsp (after switching to kernel stack)
|
|
* - r19: saved b6
|
|
* - r20: saved r1 (gp)
|
|
* - r21: saved ar.fpsr
|
|
* - r22: kernel's register backing store base (krbs_base)
|
|
* - r23: saved ar.bspstore
|
|
* - r24: saved ar.rnat
|
|
* - r25: saved ar.unat
|
|
* - r26: saved ar.pfs
|
|
* - r27: saved ar.rsc
|
|
* - r28: saved cr.iip
|
|
* - r29: saved cr.ipsr
|
|
* - r30: ar.itc for accounting (don't touch)
|
|
* - r31: saved pr
|
|
* - b0: original contents (to be saved)
|
|
* On exit:
|
|
* - p10: TRUE if syscall is invoked with more than 8 out
|
|
* registers or r15's Nat is true
|
|
* - r1: kernel's gp
|
|
* - r3: preserved (same as on entry)
|
|
* - r8: -EINVAL if p10 is true
|
|
* - r12: points to kernel stack
|
|
* - r13: points to current task
|
|
* - r14: preserved (same as on entry)
|
|
* - p13: preserved
|
|
* - p15: TRUE if interrupts need to be re-enabled
|
|
* - ar.fpsr: set to kernel settings
|
|
* - b6: preserved (same as on entry)
|
|
*/
|
|
GLOBAL_ENTRY(ia64_syscall_setup)
|
|
#if PT(B6) != 0
|
|
# error This code assumes that b6 is the first field in pt_regs.
|
|
#endif
|
|
st8 [r1]=r19 // save b6
|
|
add r16=PT(CR_IPSR),r1 // initialize first base pointer
|
|
add r17=PT(R11),r1 // initialize second base pointer
|
|
;;
|
|
alloc r19=ar.pfs,8,0,0,0 // ensure in0-in7 are writable
|
|
st8 [r16]=r29,PT(AR_PFS)-PT(CR_IPSR) // save cr.ipsr
|
|
tnat.nz p8,p0=in0
|
|
|
|
st8.spill [r17]=r11,PT(CR_IIP)-PT(R11) // save r11
|
|
tnat.nz p9,p0=in1
|
|
(pKStk) mov r18=r0 // make sure r18 isn't NaT
|
|
;;
|
|
|
|
st8 [r16]=r26,PT(CR_IFS)-PT(AR_PFS) // save ar.pfs
|
|
st8 [r17]=r28,PT(AR_UNAT)-PT(CR_IIP) // save cr.iip
|
|
mov r28=b0 // save b0 (2 cyc)
|
|
;;
|
|
|
|
st8 [r17]=r25,PT(AR_RSC)-PT(AR_UNAT) // save ar.unat
|
|
dep r19=0,r19,38,26 // clear all bits but 0..37 [I0]
|
|
(p8) mov in0=-1
|
|
;;
|
|
|
|
st8 [r16]=r19,PT(AR_RNAT)-PT(CR_IFS) // store ar.pfs.pfm in cr.ifs
|
|
extr.u r11=r19,7,7 // I0 // get sol of ar.pfs
|
|
and r8=0x7f,r19 // A // get sof of ar.pfs
|
|
|
|
st8 [r17]=r27,PT(AR_BSPSTORE)-PT(AR_RSC)// save ar.rsc
|
|
tbit.nz p15,p0=r29,IA64_PSR_I_BIT // I0
|
|
(p9) mov in1=-1
|
|
;;
|
|
|
|
(pUStk) sub r18=r18,r22 // r18=RSE.ndirty*8
|
|
tnat.nz p10,p0=in2
|
|
add r11=8,r11
|
|
;;
|
|
(pKStk) adds r16=PT(PR)-PT(AR_RNAT),r16 // skip over ar_rnat field
|
|
(pKStk) adds r17=PT(B0)-PT(AR_BSPSTORE),r17 // skip over ar_bspstore field
|
|
tnat.nz p11,p0=in3
|
|
;;
|
|
(p10) mov in2=-1
|
|
tnat.nz p12,p0=in4 // [I0]
|
|
(p11) mov in3=-1
|
|
;;
|
|
(pUStk) st8 [r16]=r24,PT(PR)-PT(AR_RNAT) // save ar.rnat
|
|
(pUStk) st8 [r17]=r23,PT(B0)-PT(AR_BSPSTORE) // save ar.bspstore
|
|
shl r18=r18,16 // compute ar.rsc to be used for "loadrs"
|
|
;;
|
|
st8 [r16]=r31,PT(LOADRS)-PT(PR) // save predicates
|
|
st8 [r17]=r28,PT(R1)-PT(B0) // save b0
|
|
tnat.nz p13,p0=in5 // [I0]
|
|
;;
|
|
st8 [r16]=r18,PT(R12)-PT(LOADRS) // save ar.rsc value for "loadrs"
|
|
st8.spill [r17]=r20,PT(R13)-PT(R1) // save original r1
|
|
(p12) mov in4=-1
|
|
;;
|
|
|
|
.mem.offset 0,0; st8.spill [r16]=r12,PT(AR_FPSR)-PT(R12) // save r12
|
|
.mem.offset 8,0; st8.spill [r17]=r13,PT(R15)-PT(R13) // save r13
|
|
(p13) mov in5=-1
|
|
;;
|
|
st8 [r16]=r21,PT(R8)-PT(AR_FPSR) // save ar.fpsr
|
|
tnat.nz p13,p0=in6
|
|
cmp.lt p10,p9=r11,r8 // frame size can't be more than local+8
|
|
;;
|
|
mov r8=1
|
|
(p9) tnat.nz p10,p0=r15
|
|
adds r12=-16,r1 // switch to kernel memory stack (with 16 bytes of scratch)
|
|
|
|
st8.spill [r17]=r15 // save r15
|
|
tnat.nz p8,p0=in7
|
|
nop.i 0
|
|
|
|
mov r13=r2 // establish `current'
|
|
movl r1=__gp // establish kernel global pointer
|
|
;;
|
|
st8 [r16]=r8 // ensure pt_regs.r8 != 0 (see handle_syscall_error)
|
|
(p13) mov in6=-1
|
|
(p8) mov in7=-1
|
|
|
|
cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0
|
|
movl r17=FPSR_DEFAULT
|
|
;;
|
|
mov.m ar.fpsr=r17 // set ar.fpsr to kernel default value
|
|
(p10) mov r8=-EINVAL
|
|
br.ret.sptk.many b7
|
|
END(ia64_syscall_setup)
|
|
|
|
.org ia64_ivt+0x3c00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x3c00 Entry 15 (size 64 bundles) Reserved
|
|
DBG_FAULT(15)
|
|
FAULT(15)
|
|
|
|
.org ia64_ivt+0x4000
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x4000 Entry 16 (size 64 bundles) Reserved
|
|
DBG_FAULT(16)
|
|
FAULT(16)
|
|
|
|
#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE)
|
|
/*
|
|
* There is no particular reason for this code to be here, other than
|
|
* that there happens to be space here that would go unused otherwise.
|
|
* If this fault ever gets "unreserved", simply moved the following
|
|
* code to a more suitable spot...
|
|
*
|
|
* account_sys_enter is called from SAVE_MIN* macros if accounting is
|
|
* enabled and if the macro is entered from user mode.
|
|
*/
|
|
GLOBAL_ENTRY(account_sys_enter)
|
|
// mov.m r20=ar.itc is called in advance, and r13 is current
|
|
add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13
|
|
add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13
|
|
;;
|
|
ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // time at last check in kernel
|
|
ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // time at left from kernel
|
|
;;
|
|
ld8 r23=[r16],TI_AC_STAMP-TI_AC_STIME // cumulated stime
|
|
ld8 r21=[r17] // cumulated utime
|
|
sub r22=r19,r18 // stime before leave kernel
|
|
;;
|
|
st8 [r16]=r20,TI_AC_STIME-TI_AC_STAMP // update stamp
|
|
sub r18=r20,r19 // elapsed time in user mode
|
|
;;
|
|
add r23=r23,r22 // sum stime
|
|
add r21=r21,r18 // sum utime
|
|
;;
|
|
st8 [r16]=r23 // update stime
|
|
st8 [r17]=r21 // update utime
|
|
;;
|
|
br.ret.sptk.many rp
|
|
END(account_sys_enter)
|
|
#endif
|
|
|
|
.org ia64_ivt+0x4400
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x4400 Entry 17 (size 64 bundles) Reserved
|
|
DBG_FAULT(17)
|
|
FAULT(17)
|
|
|
|
.org ia64_ivt+0x4800
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x4800 Entry 18 (size 64 bundles) Reserved
|
|
DBG_FAULT(18)
|
|
FAULT(18)
|
|
|
|
.org ia64_ivt+0x4c00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x4c00 Entry 19 (size 64 bundles) Reserved
|
|
DBG_FAULT(19)
|
|
FAULT(19)
|
|
|
|
//
|
|
// --- End of long entries, Beginning of short entries
|
|
//
|
|
|
|
.org ia64_ivt+0x5000
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5000 Entry 20 (size 16 bundles) Page Not Present (10,22,49)
|
|
ENTRY(page_not_present)
|
|
DBG_FAULT(20)
|
|
MOV_FROM_IFA(r16)
|
|
RSM_PSR_DT
|
|
/*
|
|
* The Linux page fault handler doesn't expect non-present pages to be in
|
|
* the TLB. Flush the existing entry now, so we meet that expectation.
|
|
*/
|
|
mov r17=PAGE_SHIFT<<2
|
|
;;
|
|
ptc.l r16,r17
|
|
;;
|
|
mov r31=pr
|
|
srlz.d
|
|
br.sptk.many page_fault
|
|
END(page_not_present)
|
|
|
|
.org ia64_ivt+0x5100
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5100 Entry 21 (size 16 bundles) Key Permission (13,25,52)
|
|
ENTRY(key_permission)
|
|
DBG_FAULT(21)
|
|
MOV_FROM_IFA(r16)
|
|
RSM_PSR_DT
|
|
mov r31=pr
|
|
;;
|
|
srlz.d
|
|
br.sptk.many page_fault
|
|
END(key_permission)
|
|
|
|
.org ia64_ivt+0x5200
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5200 Entry 22 (size 16 bundles) Instruction Access Rights (26)
|
|
ENTRY(iaccess_rights)
|
|
DBG_FAULT(22)
|
|
MOV_FROM_IFA(r16)
|
|
RSM_PSR_DT
|
|
mov r31=pr
|
|
;;
|
|
srlz.d
|
|
br.sptk.many page_fault
|
|
END(iaccess_rights)
|
|
|
|
.org ia64_ivt+0x5300
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5300 Entry 23 (size 16 bundles) Data Access Rights (14,53)
|
|
ENTRY(daccess_rights)
|
|
DBG_FAULT(23)
|
|
MOV_FROM_IFA(r16)
|
|
RSM_PSR_DT
|
|
mov r31=pr
|
|
;;
|
|
srlz.d
|
|
br.sptk.many page_fault
|
|
END(daccess_rights)
|
|
|
|
.org ia64_ivt+0x5400
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5400 Entry 24 (size 16 bundles) General Exception (5,32,34,36,38,39)
|
|
ENTRY(general_exception)
|
|
DBG_FAULT(24)
|
|
MOV_FROM_ISR(r16)
|
|
mov r31=pr
|
|
;;
|
|
cmp4.eq p6,p0=0,r16
|
|
(p6) br.sptk.many dispatch_illegal_op_fault
|
|
;;
|
|
mov r19=24 // fault number
|
|
br.sptk.many dispatch_to_fault_handler
|
|
END(general_exception)
|
|
|
|
.org ia64_ivt+0x5500
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5500 Entry 25 (size 16 bundles) Disabled FP-Register (35)
|
|
ENTRY(disabled_fp_reg)
|
|
DBG_FAULT(25)
|
|
rsm psr.dfh // ensure we can access fph
|
|
;;
|
|
srlz.d
|
|
mov r31=pr
|
|
mov r19=25
|
|
br.sptk.many dispatch_to_fault_handler
|
|
END(disabled_fp_reg)
|
|
|
|
.org ia64_ivt+0x5600
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5600 Entry 26 (size 16 bundles) Nat Consumption (11,23,37,50)
|
|
ENTRY(nat_consumption)
|
|
DBG_FAULT(26)
|
|
|
|
MOV_FROM_IPSR(p0, r16)
|
|
MOV_FROM_ISR(r17)
|
|
mov r31=pr // save PR
|
|
;;
|
|
and r18=0xf,r17 // r18 = cr.ipsr.code{3:0}
|
|
tbit.z p6,p0=r17,IA64_ISR_NA_BIT
|
|
;;
|
|
cmp.ne.or p6,p0=IA64_ISR_CODE_LFETCH,r18
|
|
dep r16=-1,r16,IA64_PSR_ED_BIT,1
|
|
(p6) br.cond.spnt 1f // branch if (cr.ispr.na == 0 || cr.ipsr.code{3:0} != LFETCH)
|
|
;;
|
|
MOV_TO_IPSR(p0, r16, r18)
|
|
mov pr=r31,-1
|
|
;;
|
|
RFI
|
|
|
|
1: mov pr=r31,-1
|
|
;;
|
|
FAULT(26)
|
|
END(nat_consumption)
|
|
|
|
.org ia64_ivt+0x5700
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5700 Entry 27 (size 16 bundles) Speculation (40)
|
|
ENTRY(speculation_vector)
|
|
DBG_FAULT(27)
|
|
/*
|
|
* A [f]chk.[as] instruction needs to take the branch to the recovery code but
|
|
* this part of the architecture is not implemented in hardware on some CPUs, such
|
|
* as Itanium. Thus, in general we need to emulate the behavior. IIM contains
|
|
* the relative target (not yet sign extended). So after sign extending it we
|
|
* simply add it to IIP. We also need to reset the EI field of the IPSR to zero,
|
|
* i.e., the slot to restart into.
|
|
*
|
|
* cr.imm contains zero_ext(imm21)
|
|
*/
|
|
MOV_FROM_IIM(r18)
|
|
;;
|
|
MOV_FROM_IIP(r17)
|
|
shl r18=r18,43 // put sign bit in position (43=64-21)
|
|
;;
|
|
|
|
MOV_FROM_IPSR(p0, r16)
|
|
shr r18=r18,39 // sign extend (39=43-4)
|
|
;;
|
|
|
|
add r17=r17,r18 // now add the offset
|
|
;;
|
|
MOV_TO_IIP(r17, r19)
|
|
dep r16=0,r16,41,2 // clear EI
|
|
;;
|
|
|
|
MOV_TO_IPSR(p0, r16, r19)
|
|
;;
|
|
|
|
RFI
|
|
END(speculation_vector)
|
|
|
|
.org ia64_ivt+0x5800
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5800 Entry 28 (size 16 bundles) Reserved
|
|
DBG_FAULT(28)
|
|
FAULT(28)
|
|
|
|
.org ia64_ivt+0x5900
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5900 Entry 29 (size 16 bundles) Debug (16,28,56)
|
|
ENTRY(debug_vector)
|
|
DBG_FAULT(29)
|
|
FAULT(29)
|
|
END(debug_vector)
|
|
|
|
.org ia64_ivt+0x5a00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5a00 Entry 30 (size 16 bundles) Unaligned Reference (57)
|
|
ENTRY(unaligned_access)
|
|
DBG_FAULT(30)
|
|
mov r31=pr // prepare to save predicates
|
|
;;
|
|
br.sptk.many dispatch_unaligned_handler
|
|
END(unaligned_access)
|
|
|
|
.org ia64_ivt+0x5b00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5b00 Entry 31 (size 16 bundles) Unsupported Data Reference (57)
|
|
ENTRY(unsupported_data_reference)
|
|
DBG_FAULT(31)
|
|
FAULT(31)
|
|
END(unsupported_data_reference)
|
|
|
|
.org ia64_ivt+0x5c00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5c00 Entry 32 (size 16 bundles) Floating-Point Fault (64)
|
|
ENTRY(floating_point_fault)
|
|
DBG_FAULT(32)
|
|
FAULT(32)
|
|
END(floating_point_fault)
|
|
|
|
.org ia64_ivt+0x5d00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5d00 Entry 33 (size 16 bundles) Floating Point Trap (66)
|
|
ENTRY(floating_point_trap)
|
|
DBG_FAULT(33)
|
|
FAULT(33)
|
|
END(floating_point_trap)
|
|
|
|
.org ia64_ivt+0x5e00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5e00 Entry 34 (size 16 bundles) Lower Privilege Transfer Trap (66)
|
|
ENTRY(lower_privilege_trap)
|
|
DBG_FAULT(34)
|
|
FAULT(34)
|
|
END(lower_privilege_trap)
|
|
|
|
.org ia64_ivt+0x5f00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x5f00 Entry 35 (size 16 bundles) Taken Branch Trap (68)
|
|
ENTRY(taken_branch_trap)
|
|
DBG_FAULT(35)
|
|
FAULT(35)
|
|
END(taken_branch_trap)
|
|
|
|
.org ia64_ivt+0x6000
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6000 Entry 36 (size 16 bundles) Single Step Trap (69)
|
|
ENTRY(single_step_trap)
|
|
DBG_FAULT(36)
|
|
FAULT(36)
|
|
END(single_step_trap)
|
|
|
|
.org ia64_ivt+0x6100
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6100 Entry 37 (size 16 bundles) Reserved
|
|
DBG_FAULT(37)
|
|
FAULT(37)
|
|
|
|
.org ia64_ivt+0x6200
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6200 Entry 38 (size 16 bundles) Reserved
|
|
DBG_FAULT(38)
|
|
FAULT(38)
|
|
|
|
.org ia64_ivt+0x6300
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6300 Entry 39 (size 16 bundles) Reserved
|
|
DBG_FAULT(39)
|
|
FAULT(39)
|
|
|
|
.org ia64_ivt+0x6400
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6400 Entry 40 (size 16 bundles) Reserved
|
|
DBG_FAULT(40)
|
|
FAULT(40)
|
|
|
|
.org ia64_ivt+0x6500
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6500 Entry 41 (size 16 bundles) Reserved
|
|
DBG_FAULT(41)
|
|
FAULT(41)
|
|
|
|
.org ia64_ivt+0x6600
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6600 Entry 42 (size 16 bundles) Reserved
|
|
DBG_FAULT(42)
|
|
FAULT(42)
|
|
|
|
.org ia64_ivt+0x6700
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6700 Entry 43 (size 16 bundles) Reserved
|
|
DBG_FAULT(43)
|
|
FAULT(43)
|
|
|
|
.org ia64_ivt+0x6800
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6800 Entry 44 (size 16 bundles) Reserved
|
|
DBG_FAULT(44)
|
|
FAULT(44)
|
|
|
|
.org ia64_ivt+0x6900
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6900 Entry 45 (size 16 bundles) IA-32 Exeception (17,18,29,41,42,43,44,58,60,61,62,72,73,75,76,77)
|
|
ENTRY(ia32_exception)
|
|
DBG_FAULT(45)
|
|
FAULT(45)
|
|
END(ia32_exception)
|
|
|
|
.org ia64_ivt+0x6a00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6a00 Entry 46 (size 16 bundles) IA-32 Intercept (30,31,59,70,71)
|
|
ENTRY(ia32_intercept)
|
|
DBG_FAULT(46)
|
|
FAULT(46)
|
|
END(ia32_intercept)
|
|
|
|
.org ia64_ivt+0x6b00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6b00 Entry 47 (size 16 bundles) IA-32 Interrupt (74)
|
|
ENTRY(ia32_interrupt)
|
|
DBG_FAULT(47)
|
|
FAULT(47)
|
|
END(ia32_interrupt)
|
|
|
|
.org ia64_ivt+0x6c00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6c00 Entry 48 (size 16 bundles) Reserved
|
|
DBG_FAULT(48)
|
|
FAULT(48)
|
|
|
|
.org ia64_ivt+0x6d00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6d00 Entry 49 (size 16 bundles) Reserved
|
|
DBG_FAULT(49)
|
|
FAULT(49)
|
|
|
|
.org ia64_ivt+0x6e00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6e00 Entry 50 (size 16 bundles) Reserved
|
|
DBG_FAULT(50)
|
|
FAULT(50)
|
|
|
|
.org ia64_ivt+0x6f00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x6f00 Entry 51 (size 16 bundles) Reserved
|
|
DBG_FAULT(51)
|
|
FAULT(51)
|
|
|
|
.org ia64_ivt+0x7000
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7000 Entry 52 (size 16 bundles) Reserved
|
|
DBG_FAULT(52)
|
|
FAULT(52)
|
|
|
|
.org ia64_ivt+0x7100
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7100 Entry 53 (size 16 bundles) Reserved
|
|
DBG_FAULT(53)
|
|
FAULT(53)
|
|
|
|
.org ia64_ivt+0x7200
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7200 Entry 54 (size 16 bundles) Reserved
|
|
DBG_FAULT(54)
|
|
FAULT(54)
|
|
|
|
.org ia64_ivt+0x7300
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7300 Entry 55 (size 16 bundles) Reserved
|
|
DBG_FAULT(55)
|
|
FAULT(55)
|
|
|
|
.org ia64_ivt+0x7400
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7400 Entry 56 (size 16 bundles) Reserved
|
|
DBG_FAULT(56)
|
|
FAULT(56)
|
|
|
|
.org ia64_ivt+0x7500
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7500 Entry 57 (size 16 bundles) Reserved
|
|
DBG_FAULT(57)
|
|
FAULT(57)
|
|
|
|
.org ia64_ivt+0x7600
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7600 Entry 58 (size 16 bundles) Reserved
|
|
DBG_FAULT(58)
|
|
FAULT(58)
|
|
|
|
.org ia64_ivt+0x7700
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7700 Entry 59 (size 16 bundles) Reserved
|
|
DBG_FAULT(59)
|
|
FAULT(59)
|
|
|
|
.org ia64_ivt+0x7800
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7800 Entry 60 (size 16 bundles) Reserved
|
|
DBG_FAULT(60)
|
|
FAULT(60)
|
|
|
|
.org ia64_ivt+0x7900
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7900 Entry 61 (size 16 bundles) Reserved
|
|
DBG_FAULT(61)
|
|
FAULT(61)
|
|
|
|
.org ia64_ivt+0x7a00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7a00 Entry 62 (size 16 bundles) Reserved
|
|
DBG_FAULT(62)
|
|
FAULT(62)
|
|
|
|
.org ia64_ivt+0x7b00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7b00 Entry 63 (size 16 bundles) Reserved
|
|
DBG_FAULT(63)
|
|
FAULT(63)
|
|
|
|
.org ia64_ivt+0x7c00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7c00 Entry 64 (size 16 bundles) Reserved
|
|
DBG_FAULT(64)
|
|
FAULT(64)
|
|
|
|
.org ia64_ivt+0x7d00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7d00 Entry 65 (size 16 bundles) Reserved
|
|
DBG_FAULT(65)
|
|
FAULT(65)
|
|
|
|
.org ia64_ivt+0x7e00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7e00 Entry 66 (size 16 bundles) Reserved
|
|
DBG_FAULT(66)
|
|
FAULT(66)
|
|
|
|
.org ia64_ivt+0x7f00
|
|
/////////////////////////////////////////////////////////////////////////////////////////
|
|
// 0x7f00 Entry 67 (size 16 bundles) Reserved
|
|
DBG_FAULT(67)
|
|
FAULT(67)
|
|
|
|
//-----------------------------------------------------------------------------------
|
|
// call do_page_fault (predicates are in r31, psr.dt may be off, r16 is faulting address)
|
|
ENTRY(page_fault)
|
|
SSM_PSR_DT_AND_SRLZ_I
|
|
;;
|
|
SAVE_MIN_WITH_COVER
|
|
alloc r15=ar.pfs,0,0,3,0
|
|
MOV_FROM_IFA(out0)
|
|
MOV_FROM_ISR(out1)
|
|
SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r14, r3)
|
|
adds r3=8,r2 // set up second base pointer
|
|
SSM_PSR_I(p15, p15, r14) // restore psr.i
|
|
movl r14=ia64_leave_kernel
|
|
;;
|
|
SAVE_REST
|
|
mov rp=r14
|
|
;;
|
|
adds out2=16,r12 // out2 = pointer to pt_regs
|
|
br.call.sptk.many b6=ia64_do_page_fault // ignore return address
|
|
END(page_fault)
|
|
|
|
ENTRY(non_syscall)
|
|
mov ar.rsc=r27 // restore ar.rsc before SAVE_MIN_WITH_COVER
|
|
;;
|
|
SAVE_MIN_WITH_COVER
|
|
|
|
// There is no particular reason for this code to be here, other than that
|
|
// there happens to be space here that would go unused otherwise. If this
|
|
// fault ever gets "unreserved", simply moved the following code to a more
|
|
// suitable spot...
|
|
|
|
alloc r14=ar.pfs,0,0,2,0
|
|
MOV_FROM_IIM(out0)
|
|
add out1=16,sp
|
|
adds r3=8,r2 // set up second base pointer for SAVE_REST
|
|
|
|
SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r15, r24)
|
|
// guarantee that interruption collection is on
|
|
SSM_PSR_I(p15, p15, r15) // restore psr.i
|
|
movl r15=ia64_leave_kernel
|
|
;;
|
|
SAVE_REST
|
|
mov rp=r15
|
|
;;
|
|
br.call.sptk.many b6=ia64_bad_break // avoid WAW on CFM and ignore return addr
|
|
END(non_syscall)
|
|
|
|
ENTRY(__interrupt)
|
|
DBG_FAULT(12)
|
|
mov r31=pr // prepare to save predicates
|
|
;;
|
|
SAVE_MIN_WITH_COVER // uses r31; defines r2 and r3
|
|
SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r14)
|
|
// ensure everybody knows psr.ic is back on
|
|
adds r3=8,r2 // set up second base pointer for SAVE_REST
|
|
;;
|
|
SAVE_REST
|
|
;;
|
|
MCA_RECOVER_RANGE(interrupt)
|
|
alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group
|
|
MOV_FROM_IVR(out0, r8) // pass cr.ivr as first arg
|
|
add out1=16,sp // pass pointer to pt_regs as second arg
|
|
;;
|
|
srlz.d // make sure we see the effect of cr.ivr
|
|
movl r14=ia64_leave_kernel
|
|
;;
|
|
mov rp=r14
|
|
br.call.sptk.many b6=ia64_handle_irq
|
|
END(__interrupt)
|
|
|
|
/*
|
|
* There is no particular reason for this code to be here, other than that
|
|
* there happens to be space here that would go unused otherwise. If this
|
|
* fault ever gets "unreserved", simply moved the following code to a more
|
|
* suitable spot...
|
|
*/
|
|
|
|
ENTRY(dispatch_unaligned_handler)
|
|
SAVE_MIN_WITH_COVER
|
|
;;
|
|
alloc r14=ar.pfs,0,0,2,0 // now it's safe (must be first in insn group!)
|
|
MOV_FROM_IFA(out0)
|
|
adds out1=16,sp
|
|
|
|
SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r24)
|
|
// guarantee that interruption collection is on
|
|
SSM_PSR_I(p15, p15, r3) // restore psr.i
|
|
adds r3=8,r2 // set up second base pointer
|
|
;;
|
|
SAVE_REST
|
|
movl r14=ia64_leave_kernel
|
|
;;
|
|
mov rp=r14
|
|
br.sptk.many ia64_prepare_handle_unaligned
|
|
END(dispatch_unaligned_handler)
|
|
|
|
/*
|
|
* There is no particular reason for this code to be here, other than that
|
|
* there happens to be space here that would go unused otherwise. If this
|
|
* fault ever gets "unreserved", simply moved the following code to a more
|
|
* suitable spot...
|
|
*/
|
|
|
|
ENTRY(dispatch_to_fault_handler)
|
|
/*
|
|
* Input:
|
|
* psr.ic: off
|
|
* r19: fault vector number (e.g., 24 for General Exception)
|
|
* r31: contains saved predicates (pr)
|
|
*/
|
|
SAVE_MIN_WITH_COVER_R19
|
|
alloc r14=ar.pfs,0,0,5,0
|
|
MOV_FROM_ISR(out1)
|
|
MOV_FROM_IFA(out2)
|
|
MOV_FROM_IIM(out3)
|
|
MOV_FROM_ITIR(out4)
|
|
;;
|
|
SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, out0)
|
|
// guarantee that interruption collection is on
|
|
mov out0=r15
|
|
;;
|
|
SSM_PSR_I(p15, p15, r3) // restore psr.i
|
|
adds r3=8,r2 // set up second base pointer for SAVE_REST
|
|
;;
|
|
SAVE_REST
|
|
movl r14=ia64_leave_kernel
|
|
;;
|
|
mov rp=r14
|
|
br.call.sptk.many b6=ia64_fault
|
|
END(dispatch_to_fault_handler)
|
|
|
|
/*
|
|
* Squatting in this space ...
|
|
*
|
|
* This special case dispatcher for illegal operation faults allows preserved
|
|
* registers to be modified through a callback function (asm only) that is handed
|
|
* back from the fault handler in r8. Up to three arguments can be passed to the
|
|
* callback function by returning an aggregate with the callback as its first
|
|
* element, followed by the arguments.
|
|
*/
|
|
ENTRY(dispatch_illegal_op_fault)
|
|
.prologue
|
|
.body
|
|
SAVE_MIN_WITH_COVER
|
|
SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r24)
|
|
// guarantee that interruption collection is on
|
|
;;
|
|
SSM_PSR_I(p15, p15, r3) // restore psr.i
|
|
adds r3=8,r2 // set up second base pointer for SAVE_REST
|
|
;;
|
|
alloc r14=ar.pfs,0,0,1,0 // must be first in insn group
|
|
mov out0=ar.ec
|
|
;;
|
|
SAVE_REST
|
|
PT_REGS_UNWIND_INFO(0)
|
|
;;
|
|
br.call.sptk.many rp=ia64_illegal_op_fault
|
|
.ret0: ;;
|
|
alloc r14=ar.pfs,0,0,3,0 // must be first in insn group
|
|
mov out0=r9
|
|
mov out1=r10
|
|
mov out2=r11
|
|
movl r15=ia64_leave_kernel
|
|
;;
|
|
mov rp=r15
|
|
mov b6=r8
|
|
;;
|
|
cmp.ne p6,p0=0,r8
|
|
(p6) br.call.dpnt.many b6=b6 // call returns to ia64_leave_kernel
|
|
br.sptk.many ia64_leave_kernel
|
|
END(dispatch_illegal_op_fault)
|