/*
* arch/ia64/kernel/ivt.S
*
* Copyright (C) 1998-2001, 2003, 2005 Hewlett-Packard Co
* Stephane Eranian <eranian@hpl.hp.com>
* David Mosberger <davidm@hpl.hp.com>
* Copyright (C) 2000, 2002-2003 Intel Co
* Asit Mallick <asit.k.mallick@intel.com>
* Suresh Siddha <suresh.b.siddha@intel.com>
* Kenneth Chen <kenneth.w.chen@intel.com>
* Fenghua Yu <fenghua.yu@intel.com>
*
* 00/08/23 Asit Mallick <asit.k.mallick@intel.com> TLB handling for SMP
* 00/12/20 David Mosberger-Tang <davidm@hpl.hp.com> DTLB/ITLB handler now uses virtual PT.
*/
/*
* This file defines the interruption vector table used by the CPU.
* It does not include one entry per possible cause of interruption.
*
* The first 20 entries of the table contain 64 bundles each while the
* remaining 48 entries contain only 16 bundles each.
*
* The 64 bundles are used to allow inlining the whole handler for critical
* interruptions like TLB misses.
*
* For each entry, the comment is as follows:
*
* // 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
* entry offset ----/ / / / /
* entry number ---------/ / / /
* size of the entry -------------/ / /
* vector name -------------------------------------/ /
* interruptions triggering this vector ----------------------/
*
* The table is 32KB in size and must be aligned on 32KB boundary.
* (The CPU ignores the 15 lower bits of the address)
*
* Table is based upon EAS2.6 (Oct 1999)
*/
#include <linux/config.h>
#include <asm/asmmacro.h>
#include <asm/break.h>
#include <asm/ia32.h>
#include <asm/kregs.h>
#include <asm/asm-offsets.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/thread_info.h>
#include <asm/unistd.h>
#include <asm/errno.h>
#if 1
# define PSR_DEFAULT_BITS psr.ac
#else
# define PSR_DEFAULT_BITS 0
#endif
#if 0
/*
* This lets you track the last eight faults that occurred on the CPU. Make sure ar.k2 isn't
* needed for something else before enabling this...
*/
# define DBG_FAULT(i) mov r16=ar.k2;; shl r16=r16,8;; add r16=(i),r16;;mov ar.k2=r16
#else
# define DBG_FAULT(i)
#endif
#include "minstate.h"
#define FAULT(n) \
mov r31=pr; \
mov r19=n;; /* prepare to save predicates */ \
br.sptk.many dispatch_to_fault_handler
.section .text.ivt,"ax"
.align 32768 // align on 32KB boundary
.global ia64_ivt
ia64_ivt:
/////////////////////////////////////////////////////////////////////////////////////////
// 0x0000 Entry 0 (size 64 bundles) VHPT Translation (8,20,47)
ENTRY(vhpt_miss)
DBG_FAULT(0)
/*
* The VHPT vector is invoked when the TLB entry for the virtual page table
* is missing. This happens only as a result of a previous
* (the "original") TLB miss, which may either be caused by an instruction
* fetch or a data access (or non-access).
*
* What we do here is normal TLB miss handing for the _original_ miss,
* followed by inserting the TLB entry for the virtual page table page
* that the VHPT walker was attempting to access. The latter gets
* inserted as long as page table entry above pte level have valid
* mappings for the faulting address. The TLB entry for the original
* miss gets inserted only if the pte entry indicates that the page is
* present.
*
* do_page_fault gets invoked in the following cases:
* - the faulting virtual address uses unimplemented address bits
* - the faulting virtual address has no valid page table mapping
*/
mov r16=cr.ifa // get address that caused the TLB miss
#ifdef CONFIG_HUGETLB_PAGE
movl r18=PAGE_SHIFT
mov r25=cr.itir
#endif
;;
rsm psr.dt // use physical addressing for data
mov r31=pr // save the predicate registers
mov r19=IA64_KR(PT_BASE) // get page table base address
shl r21=r16,3 // shift bit 60 into sign bit
shr.u r17=r16,61 // get the region number into r17
;;
shr.u r22=r21,3
#ifdef CONFIG_HUGETLB_PAGE
extr.u r26=r25,2,6
;;
cmp.ne p8,p0=r18,r26
sub r27=r26,r18
;;
(p8) dep r25=r18,r25,2,6
(p8) shr r22=r22,r27
#endif
;;
cmp.eq p6,p7=5,r17 // is IFA pointing into to region 5?
shr.u r18=r22,PGDIR_SHIFT // get bottom portion of pgd index bit
;;
(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?
#ifdef CONFIG_PGTABLE_4
shr.u r28=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?
#ifdef CONFIG_PGTABLE_4
dep r28=r28,r17,3,(PAGE_SHIFT-3) // r28=pud_offset(pgd,addr)
;;
shr.u r18=r22,PMD_SHIFT // shift pmd index into position
(p7) ld8 r29=[r28] // get *pud (may be 0)
;;
(p7) cmp.eq.or.andcm p6,p7=r29,r0 // was pud_present(*pud) == NULL?
dep r17=r18,r29,3,(PAGE_SHIFT-3) // r17=pmd_offset(pud,addr)
#else
dep r17=r18,r17,3,(PAGE_SHIFT-3) // r17=pmd_offset(pgd,addr)
#endif
;;
(p7) ld8 r20=[r17] // get *pmd (may be 0)
shr.u r19=r22,PAGE_SHIFT // shift pte index into position
;;
(p7) cmp.eq.or.andcm p6,p7=r20,r0 // was pmd_present(*pmd) == NULL?
dep r21=r19,r20,3,(PAGE_SHIFT-3) // r21=pte_offset(pmd,addr)
;;
(p7) ld8 r18=[r21] // read *pte
mov r19=cr.isr // cr.isr bit 32 tells us if this is an insn miss
;;
(p7) tbit.z p6,p7=r18,_PAGE_P_BIT // page present bit cleared?
mov r22=cr.iha // get the VHPT address that caused the TLB miss
;; // avoid RAW on p7
(p7) tbit.nz.unc p10,p11=r19,32 // is it an instruction TLB miss?
dep r23=0,r20,0,PAGE_SHIFT // clear low bits to get page address
;;
(p10) itc.i r18 // insert the instruction TLB entry
(p11) itc.d r18 // insert the data TLB entry
(p6) br.cond.spnt.many page_fault // handle bad address/page not present (page fault)
mov cr.ifa=r22
#ifdef CONFIG_HUGETLB_PAGE
(p8) mov cr.itir=r25 // change to default page-size for VHPT
#endif
/*
* Now compute and insert the TLB entry for the virtual page table. We never
* execute in a page table page so there is no need to set the exception deferral
* bit.
*/
adds r24=__DIRTY_BITS_NO_ED|_PAGE_PL_0|_PAGE_AR_RW,r23
;;
(p7) itc.d r24
;;
#ifdef CONFIG_SMP
/*
* Tell the assemblers dependency-violation checker that the above "itc" instructions
* cannot possibly affect the following loads:
*/
dv_serialize_data
/*
* Re-check pagetable entry. If they changed, we may have received a ptc.g
* between reading the pagetable and the "itc". If so, flush the entry we
* inserted and retry. At this point, we have:
*
* r28 = equivalent of pud_offset(pgd, ifa)
* r17 = equivalent of pmd_offset(pud, ifa)
* r21 = equivalent of pte_offset(pmd, ifa)
*
* r29 = *pud
* r20 = *pmd
* r18 = *pte
*/
ld8 r25=[r21] // read *pte again
ld8 r26=[r17] // read *pmd again
#ifdef CONFIG_PGTABLE_4
ld8 r19=[r28] // read *pud again
#endif
cmp.ne p6,p7=r0,r0
;;
cmp.ne.or.andcm p6,p7=r26,r20 // did *pmd change
#ifdef CONFIG_PGTABLE_4
cmp.ne.or.andcm p6,p7=r19,r29 // did *pud change
#endif
mov r27=PAGE_SHIFT<<2
;;
(p6) ptc.l r22,r27 // purge PTE page translation
(p7) cmp.ne.or.andcm p6,p7=r25,r18 // did *pte change
;;
(p6) ptc.l r16,r27 // purge translation
#endif
mov pr=r31,-1 // restore predicate registers
rfi
END(vhpt_miss)
.org ia64_ivt+0x400
/////////////////////////////////////////////////////////////////////////////////////////
// 0x0400 Entry 1 (size 64 bundles) ITLB (21)
ENTRY(itlb_miss)
DBG_FAULT(1)
/*
* The ITLB handler accesses the PTE via the virtually mapped linear
* page table. If a nested TLB miss occurs, we switch into physical
* mode, walk the page table, and then re-execute the PTE read and
* go on normally after that.
*/
mov r16=cr.ifa // get virtual address
mov r29=b0 // save b0
mov r31=pr // save predicates
.itlb_fault:
mov r17=cr.iha // get virtual address of PTE
movl r30=1f // load nested fault continuation point
;;
1: ld8 r18=[r17] // read *pte
;;
mov b0=r29
tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
(p6) br.cond.spnt page_fault
;;
itc.i r18
;;
#ifdef CONFIG_SMP
/*
* Tell the assemblers dependency-violation checker that the above "itc" instructions
* cannot possibly affect the following loads:
*/
dv_serialize_data
ld8 r19=[r17] // read *pte again and see if same
mov r20=PAGE_SHIFT<<2 // setup page size for purge
;;
cmp.ne p7,p0=r18,r19
;;
(p7) ptc.l r16,r20
#endif
mov pr=r31,-1
rfi
END(itlb_miss)
.org ia64_ivt+0x0800
/////////////////////////////////////////////////////////////////////////////////////////
// 0x0800 Entry 2 (size 64 bundles) DTLB (9,48)
ENTRY(dtlb_miss)
DBG_FAULT(2)
/*
* The DTLB handler accesses the PTE via the virtually mapped linear
* page table. If a nested TLB miss occurs, we switch into physical
* mode, walk the page table, and then re-execute the PTE read and
* go on normally after that.
*/
mov r16=cr.ifa // get virtual address
mov r29=b0 // save b0
mov r31=pr // save predicates
dtlb_fault:
mov r17=cr.iha // get virtual address of PTE
movl r30=1f // load nested fault continuation point
;;
1: ld8 r18=[r17] // read *pte
;;
mov b0=r29
tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
(p6) br.cond.spnt page_fault
;;
itc.d r18
;;
#ifdef CONFIG_SMP
/*
* Tell the assemblers dependency-violation checker that the above "itc" instructions
* cannot possibly affect the following loads:
*/
dv_serialize_data
ld8 r19=[r17] // read *pte again and see if same
mov r20=PAGE_SHIFT<<2 // setup page size for purge
;;
cmp.ne p7,p0=r18,r19
;;
(p7) ptc.l r16,r20
#endif
mov pr=r31,-1
rfi
END(dtlb_miss)
.org ia64_ivt+0x0c00
/////////////////////////////////////////////////////////////////////////////////////////
// 0x0c00 Entry 3 (size 64 bundles) Alt ITLB (19)
ENTRY(alt_itlb_miss)
DBG_FAULT(3)
mov r16=cr.ifa // get address that caused the TLB miss
movl r17=PAGE_KERNEL
mov r21=cr.ipsr
movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
mov r31=pr
;;
#ifdef CONFIG_DISABLE_VHPT
shr.u r22=r16,61 // get the region number into r21
;;
cmp.gt p8,p0=6,r22 // user mode
;;
(p8) thash r17=r16
;;
(p8) mov cr.iha=r17
(p8) mov r29=b0 // save b0
(p8) br.cond.dptk .itlb_fault
#endif
extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
shr.u r18=r16,57 // move address bit 61 to bit 4
;;
andcm r18=0x10,r18 // bit 4=~address-bit(61)
cmp.ne p8,p0=r0,r23 // psr.cpl != 0?
or r19=r17,r19 // insert PTE control bits into r19
;;
or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
(p8) br.cond.spnt page_fault
;;
itc.i r19 // insert the TLB entry
mov pr=r31,-1
rfi
END(alt_itlb_miss)
.org ia64_ivt+0x1000
/////////////////////////////////////////////////////////////////////////////////////////
// 0x1000 Entry 4 (size 64 bundles) Alt DTLB (7,46)
ENTRY(alt_dtlb_miss)
DBG_FAULT(4)
mov r16=cr.ifa // get address that caused the TLB miss
movl r17=PAGE_KERNEL
mov r20=cr.isr
movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
mov r21=cr.ipsr
mov r31=pr
;;
#ifdef CONFIG_DISABLE_VHPT
shr.u r22=r16,61 // get the region number into r21
;;
cmp.gt p8,p0=6,r22 // access to region 0-5
;;
(p8) thash r17=r16
;;
(p8) mov cr.iha=r17
(p8) mov r29=b0 // save b0
(p8) br.cond.dptk dtlb_fault
#endif
extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
and r22=IA64_ISR_CODE_MASK,r20 // get the isr.code field
tbit.nz p6,p7=r20,IA64_ISR_SP_BIT // is speculation bit on?
shr.u r18=r16,57 // move address bit 61 to bit 4
and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
tbit.nz p9,p0=r20,IA64_ISR_NA_BIT // is non-access bit on?
;;
andcm r18=0x10,r18 // bit 4=~address-bit(61)
cmp.ne p8,p0=r0,r23
(p9) cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22 // check isr.code field
(p8) br.cond.spnt page_fault
dep r21=-1,r21,IA64_PSR_ED_BIT,1
or r19=r19,r17 // insert PTE control bits into r19
;;
or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
(p6) mov cr.ipsr=r21
;;
(p7) itc.d r19 // insert the TLB entry
mov pr=r31,-1
rfi
END(alt_dtlb_miss)
.org ia64_ivt+0x1400
/////////////////////////////////////////////////////////////////////////////////////////
// 0x1400 Entry 5 (size 64 bundles) Data nested TLB (6,45)
ENTRY(nested_dtlb_miss)
/*
* In the absence of kernel bugs, we get here when the virtually mapped linear
* page table is accessed non-speculatively (e.g., in the Dirty-bit, Instruction
* 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 r18=cr.itir
;;
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?
#ifdef CONFIG_PGTABLE_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)
;;
#ifdef CONFIG_PGTABLE_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)
//-----------------------------------------------------------------------------------
// call do_page_fault (predicates are in r31, psr.dt may be off, r16 is faulting address)
ENTRY(page_fault)
ssm psr.dt
;;
srlz.i
;;
SAVE_MIN_WITH_COVER
alloc r15=ar.pfs,0,0,3,0
mov out0=cr.ifa
mov out1=cr.isr
adds r3=8,r2 // set up second base pointer
;;
ssm psr.ic | PSR_DEFAULT_BITS
;;
srlz.i // guarantee that interruption collectin is on
;;
(p15) ssm psr.i // 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)
.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 r16=cr.ifa // get the address that caused the fault
movl r30=1f // load continuation point in case of nested fault
;;
thash r17=r16 // 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
;;
cmpxchg8.acq r26=[r17],r25,ar.ccv
mov r24=PAGE_SHIFT<<2
;;
cmp.eq p6,p7=r26,r18
;;
(p6) itc.d r25 // 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 r18 // 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 r16=cr.ifa // 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 r17=cr.ipsr
;;
mov r18=cr.iip
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 r17=r16 // 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
;;
cmpxchg8.acq r26=[r17],r25,ar.ccv
mov r24=PAGE_SHIFT<<2
;;
cmp.eq p6,p7=r26,r18
;;
(p6) itc.i r25 // 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 r18 // 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 r16=cr.ifa // get the address that caused the fault
movl r30=1f // load continuation point in case of nested fault
;;
thash r17=r16 // 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
;;
cmpxchg8.acq r26=[r17],r25,ar.ccv
mov r24=PAGE_SHIFT<<2
;;
cmp.eq p6,p7=r26,r18
;;
(p6) itc.d r25 // 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 r18 // 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 r29=cr.ipsr // M2 (12 cyc)
mov r31=pr // I0 (2 cyc)
mov r17=cr.iim // 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 r28=cr.iip // 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
nop.i 0
;;
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
mov b6=r30 // I0 setup syscall handler branch reg early
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:
mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0
nop 0
bsw.1 // B (6 cyc) regs are saved, switch to bank 1
;;
ssm psr.ic | PSR_DEFAULT_BITS // M2 now it's safe to re-enable intr.-collection
movl r3=ia64_ret_from_syscall // X
;;
srlz.i // M0 ensure interruption collection is on
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
(p15) ssm psr.i // 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)
DBG_FAULT(12)
mov r31=pr // prepare to save predicates
;;
SAVE_MIN_WITH_COVER // uses r31; defines r2 and r3
ssm psr.ic | PSR_DEFAULT_BITS
;;
adds r3=8,r2 // set up second base pointer for SAVE_REST
srlz.i // ensure everybody knows psr.ic is back on
;;
SAVE_REST
;;
alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group
mov out0=cr.ivr // 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)
.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
* - 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)
/*
* 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 | PSR_DEFAULT_BITS
;;
srlz.i // guarantee that interruption collection is on
;;
(p15) ssm psr.i // 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)
.org ia64_ivt+0x4000
/////////////////////////////////////////////////////////////////////////////////////////
// 0x4000 Entry 16 (size 64 bundles) Reserved
DBG_FAULT(16)
FAULT(16)
.org ia64_ivt+0x4400
/////////////////////////////////////////////////////////////////////////////////////////
// 0x4400 Entry 17 (size 64 bundles) Reserved
DBG_FAULT(17)
FAULT(17)
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 out0=cr.iim
add out1=16,sp
adds r3=8,r2 // set up second base pointer for SAVE_REST
ssm psr.ic | PSR_DEFAULT_BITS
;;
srlz.i // guarantee that interruption collection is on
;;
(p15) ssm psr.i // 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)
.org ia64_ivt+0x4800
/////////////////////////////////////////////////////////////////////////////////////////
// 0x4800 Entry 18 (size 64 bundles) Reserved
DBG_FAULT(18)
FAULT(18)
/*
* 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 out0=cr.ifa
adds out1=16,sp
ssm psr.ic | PSR_DEFAULT_BITS
;;
srlz.i // guarantee that interruption collection is on
;;
(p15) ssm psr.i // 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)
.org ia64_ivt+0x4c00
/////////////////////////////////////////////////////////////////////////////////////////
// 0x4c00 Entry 19 (size 64 bundles) Reserved
DBG_FAULT(19)
FAULT(19)
/*
* 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 out0=r15
mov out1=cr.isr
mov out2=cr.ifa
mov out3=cr.iim
mov out4=cr.itir
;;
ssm psr.ic | PSR_DEFAULT_BITS
;;
srlz.i // guarantee that interruption collection is on
;;
(p15) ssm psr.i // 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)
//
// --- 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 r16=cr.ifa
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 r16=cr.ifa
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 r16=cr.ifa
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 r16=cr.ifa
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 r16=cr.isr
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 r16=cr.ipsr
mov r17=cr.isr
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 cr.ipsr=r16 // set cr.ipsr.na
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 r18=cr.iim
;;
mov r17=cr.iip
shl r18=r18,43 // put sign bit in position (43=64-21)
;;
mov r16=cr.ipsr
shr r18=r18,39 // sign extend (39=43-4)
;;
add r17=r17,r18 // now add the offset
;;
mov cr.iip=r17
dep r16=0,r16,41,2 // clear EI
;;
mov cr.ipsr=r16
;;
rfi // and go back
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 r16=cr.ipsr
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)
#ifdef CONFIG_IA32_SUPPORT
mov r31=pr
mov r16=cr.isr
;;
extr.u r17=r16,16,8 // get ISR.code
mov r18=ar.eflag
mov r19=cr.iim // old eflag value
;;
cmp.ne p6,p0=2,r17
(p6) br.cond.spnt 1f // not a system flag fault
xor r16=r18,r19
;;
extr.u r17=r16,18,1 // get the eflags.ac bit
;;
cmp.eq p6,p0=0,r17
(p6) br.cond.spnt 1f // eflags.ac bit didn't change
;;
mov pr=r31,-1 // restore predicate registers
rfi
1:
#endif // CONFIG_IA32_SUPPORT
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)
#ifdef CONFIG_IA32_SUPPORT
mov r31=pr
br.sptk.many dispatch_to_ia32_handler
#else
FAULT(47)
#endif
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)
#ifdef CONFIG_IA32_SUPPORT
/*
* 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...
*/
// IA32 interrupt entry point
ENTRY(dispatch_to_ia32_handler)
SAVE_MIN
;;
mov r14=cr.isr
ssm psr.ic | PSR_DEFAULT_BITS
;;
srlz.i // guarantee that interruption collection is on
;;
(p15) ssm psr.i
adds r3=8,r2 // Base pointer for SAVE_REST
;;
SAVE_REST
;;
mov r15=0x80
shr r14=r14,16 // Get interrupt number
;;
cmp.ne p6,p0=r14,r15
(p6) br.call.dpnt.many b6=non_ia32_syscall
adds r14=IA64_PT_REGS_R8_OFFSET + 16,sp // 16 byte hole per SW conventions
adds r15=IA64_PT_REGS_R1_OFFSET + 16,sp
;;
cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0
ld8 r8=[r14] // get r8
;;
st8 [r15]=r8 // save original EAX in r1 (IA32 procs don't use the GP)
;;
alloc r15=ar.pfs,0,0,6,0 // must first in an insn group
;;
ld4 r8=[r14],8 // r8 == eax (syscall number)
mov r15=IA32_NR_syscalls
;;
cmp.ltu.unc p6,p7=r8,r15
ld4 out1=[r14],8 // r9 == ecx
;;
ld4 out2=[r14],8 // r10 == edx
;;
ld4 out0=[r14] // r11 == ebx
adds r14=(IA64_PT_REGS_R13_OFFSET) + 16,sp
;;
ld4 out5=[r14],PT(R14)-PT(R13) // r13 == ebp
;;
ld4 out3=[r14],PT(R15)-PT(R14) // r14 == esi
adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
;;
ld4 out4=[r14] // r15 == edi
movl r16=ia32_syscall_table
;;
(p6) shladd r16=r8,3,r16 // force ni_syscall if not valid syscall number
ld4 r2=[r2] // r2 = current_thread_info()->flags
;;
ld8 r16=[r16]
and r2=_TIF_SYSCALL_TRACEAUDIT,r2 // mask trace or audit
;;
mov b6=r16
movl r15=ia32_ret_from_syscall
cmp.eq p8,p0=r2,r0
;;
mov rp=r15
(p8) br.call.sptk.many b6=b6
br.cond.sptk ia32_trace_syscall
non_ia32_syscall:
alloc r15=ar.pfs,0,0,2,0
mov out0=r14 // interrupt #
add out1=16,sp // pointer to pt_regs
;; // avoid WAW on CFM
br.call.sptk.many rp=ia32_bad_interrupt
.ret1: movl r15=ia64_leave_kernel
;;
mov rp=r15
br.ret.sptk.many rp
END(dispatch_to_ia32_handler)
#endif /* CONFIG_IA32_SUPPORT */
