/* * arch/ia64/kernel/ivt.S * * Copyright (C) 1998-2001 Hewlett-Packard Co * Stephane Eranian <eranian@hpl.hp.com> * David Mosberger <davidm@hpl.hp.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/kregs.h> #include <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> #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 #define MINSTATE_VIRT /* needed by minstate.h */ #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 both L1 and L2 have valid mappings for the faulting address. * The TLB entry for the original miss gets inserted only if * the L3 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 L1, L2, or L3 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 r22=r21,3 #ifdef CONFIG_HUGETLB_PAGE extr.u r26=r25,2,6 ;; cmp.eq p8,p0=HPAGE_SHIFT,r26 ;; (p8) dep r25=r18,r25,2,6 (p8) shr r22=r22,HPAGE_SHIFT-PAGE_SHIFT ;; #endif cmp.eq p6,p7=5,r17 // is IFA pointing into to region 5? shr.u r18=r22,PGDIR_SHIFT // get bits 33-63 of the faulting address ;; (p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place srlz.d // ensure "rsm psr.dt" has taken effect (p6) movl r19=__pa(swapper_pg_dir) // region 5 is rooted at swapper_pg_dir (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=PTA + IFA(33,42)*8 (p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=PTA + (((IFA(61,63) << 7) | IFA(33,39))*8) cmp.eq p7,p6=0,r21 // unused address bits all zeroes? shr.u r18=r22,PMD_SHIFT // shift L2 index into position ;; ld8 r17=[r17] // fetch the L1 entry (may be 0) ;; (p7) cmp.eq p6,p7=r17,r0 // was L1 entry NULL? dep r17=r18,r17,3,(PAGE_SHIFT-3) // compute address of L2 page table entry ;; (p7) ld8 r20=[r17] // fetch the L2 entry (may be 0) shr.u r19=r22,PAGE_SHIFT // shift L3 index into position ;; (p7) cmp.eq.or.andcm p6,p7=r20,r0 // was L2 entry NULL? dep r21=r19,r20,3,(PAGE_SHIFT-3) // compute address of L3 page table entry ;; (p7) ld8 r18=[r21] // read the L3 PTE mov r19=cr.isr // cr.isr bit 0 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 /* * Re-check L2 and L3 pagetable. 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. */ ld8 r25=[r21] // read L3 PTE again ld8 r26=[r17] // read L2 entry again ;; cmp.ne p6,p7=r26,r20 // did L2 entry change mov r27=PAGE_SHIFT<<2 ;; (p6) ptc.l r22,r27 // purge PTE page translation (p7) cmp.ne.or.andcm p6,p7=r25,r18 // did L3 PTE change ;; (p6) ptc.l r16,r27 // purge translation #endif mov pr=r31,-1 // restore predicate registers rfi END(vhpt_miss) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 0x0400 Entry 1 (size 64 bundles) ITLB (21) ENTRY(itlb_miss) DBG_FAULT(1) /* * The ITLB handler accesses the L3 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 L3 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 L3 PTE movl r30=1f // load nested fault continuation point ;; 1: ld8 r18=[r17] // read L3 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 ld8 r19=[r17] // read L3 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) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 0x0800 Entry 2 (size 64 bundles) DTLB (9,48) ENTRY(dtlb_miss) DBG_FAULT(2) /* * The DTLB handler accesses the L3 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 L3 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 L3 PTE movl r30=1f // load nested fault continuation point ;; 1: ld8 r18=[r17] // read L3 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 ld8 r19=[r17] // read L3 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) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 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) //----------------------------------------------------------------------------------- // 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) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 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 L3 PTE of faulting address * r29: saved b0 * r30: continuation address * r31: saved pr * * Clobbered: b0, r18, r19, r21, 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 ;; shr.u r17=r16,61 // get the region number into r17 ;; cmp.eq p6,p7=5,r17 // is faulting address in region 5? shr.u r18=r16,PGDIR_SHIFT // get bits 33-63 of faulting address ;; (p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place srlz.d (p6) movl r19=__pa(swapper_pg_dir) // region 5 is rooted at swapper_pg_dir (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=PTA + IFA(33,42)*8 (p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=PTA + (((IFA(61,63) << 7) | IFA(33,39))*8) cmp.eq p7,p6=0,r21 // unused address bits all zeroes? shr.u r18=r16,PMD_SHIFT // shift L2 index into position ;; ld8 r17=[r17] // fetch the L1 entry (may be 0) ;; (p7) cmp.eq p6,p7=r17,r0 // was L1 entry NULL? dep r17=r18,r17,3,(PAGE_SHIFT-3) // compute address of L2 page table entry ;; (p7) ld8 r17=[r17] // fetch the L2 entry (may be 0) shr.u r19=r16,PAGE_SHIFT // shift L3 index into position ;; (p7) cmp.eq.or.andcm p6,p7=r17,r0 // was L2 entry NULL? dep r17=r19,r17,3,(PAGE_SHIFT-3) // compute address of L3 page table entry (p6) br.cond.spnt page_fault mov b0=r30 br.sptk.many b0 // return to continuation point END(nested_dtlb_miss) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 0x1800 Entry 6 (size 64 bundles) Instruction Key Miss (24) ENTRY(ikey_miss) DBG_FAULT(6) FAULT(6) END(ikey_miss) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51) ENTRY(dkey_miss) DBG_FAULT(7) FAULT(7) END(dkey_miss) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 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 ;; 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(idirty_bit) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 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 ;; 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) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 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 ;; 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) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 0x2c00 Entry 11 (size 64 bundles) Break instruction (33) ENTRY(break_fault) DBG_FAULT(11) mov r16=cr.iim mov r17=__IA64_BREAK_SYSCALL mov r31=pr // prepare to save predicates ;; cmp.eq p0,p7=r16,r17 // is this a system call? (p7 <- false, if so) (p7) br.cond.spnt non_syscall SAVE_MIN // uses r31; defines r2: ssm psr.ic | PSR_DEFAULT_BITS ;; srlz.i // guarantee that interruption collection is on cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0 ;; (p15) ssm psr.i // restore psr.i adds r8=(IA64_PT_REGS_R8_OFFSET-IA64_PT_REGS_R16_OFFSET),r2 ;; stf8 [r8]=f1 // ensure pt_regs.r8 != 0 (see handle_syscall_error) adds r3=8,r2 // set up second base pointer for SAVE_REST ;; SAVE_REST br.call.sptk.many rp=demine_args // clear NaT bits in (potential) syscall args mov r3=255 adds r15=-1024,r15 // r15 contains the syscall number---subtract 1024 ;; cmp.geu p6,p7=r3,r15 // (syscall > 0 && syscall <= 1024+255) ? movl r16=sys_call_table ;; (p6) shladd r16=r15,3,r16 movl r15=ia64_ret_from_syscall (p7) adds r16=(__NR_ni_syscall-1024)*8,r16 // force __NR_ni_syscall ;; ld8 r16=[r16] // load address of syscall entry point mov rp=r15 // set the real return addr ;; mov b6=r16 // arrange things so we skip over break instruction when returning: adds r16=16,sp // get pointer to cr_ipsr adds r17=24,sp // get pointer to cr_iip add r2=TI_FLAGS+IA64_TASK_SIZE,r13 ;; ld8 r18=[r16] // fetch cr_ipsr ld4 r2=[r2] // r2 = current_thread_info()->flags ;; ld8 r19=[r17] // fetch cr_iip extr.u r20=r18,41,2 // extract ei field ;; cmp.eq p6,p7=2,r20 // isr.ei==2? adds r19=16,r19 // compute address of next bundle ;; (p6) mov r20=0 // clear ei to 0 (p7) adds r20=1,r20 // increment ei to next slot ;; (p6) st8 [r17]=r19 // store new cr.iip if cr.isr.ei wrapped around dep r18=r20,r18,41,2 // insert new ei into cr.isr tbit.z p8,p0=r2,TIF_SYSCALL_TRACE ;; st8 [r16]=r18 // store new value for cr.isr (p8) br.call.sptk.many b6=b6 // ignore this return addr br.cond.sptk ia64_trace_syscall // NOT REACHED END(break_fault) ENTRY(demine_args) alloc r2=ar.pfs,8,0,0,0 tnat.nz p8,p0=in0 tnat.nz p9,p0=in1 ;; (p8) mov in0=-1 tnat.nz p10,p0=in2 tnat.nz p11,p0=in3 (p9) mov in1=-1 tnat.nz p12,p0=in4 tnat.nz p13,p0=in5 ;; (p10) mov in2=-1 tnat.nz p14,p0=in6 tnat.nz p15,p0=in7 (p11) mov in3=-1 tnat.nz p8,p0=r15 // demining r15 is not a must, but it is safer (p12) mov in4=-1 (p13) mov in5=-1 ;; (p14) mov in6=-1 (p15) mov in7=-1 (p8) mov r15=-1 br.ret.sptk.many rp END(demine_args) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 0x3400 Entry 13 (size 64 bundles) Reserved DBG_FAULT(13) FAULT(13) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 0x3800 Entry 14 (size 64 bundles) Reserved DBG_FAULT(14) FAULT(14) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 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) 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 ;; 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) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 0x4000 Entry 16 (size 64 bundles) Reserved DBG_FAULT(16) FAULT(16) #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 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=230 // number of entries in ia32 system call table ;; 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_R8_OFFSET-(8*3)) + 16,sp ;; ld4 out5=[r14],8 // r13 == ebp ;; ld4 out3=[r14],8 // 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] tbit.z p8,p0=r2,TIF_SYSCALL_TRACE ;; mov b6=r16 movl r15=ia32_ret_from_syscall ;; 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 */ .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 0x4400 Entry 17 (size 64 bundles) Reserved DBG_FAULT(17) FAULT(17) ENTRY(non_syscall) 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) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 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 // .align 1024 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x5600 Entry 26 (size 16 bundles) Nat Consumption (11,23,37,50) ENTRY(nat_consumption) DBG_FAULT(26) FAULT(26) END(nat_consumption) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x5800 Entry 28 (size 16 bundles) Reserved DBG_FAULT(28) FAULT(28) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x5900 Entry 29 (size 16 bundles) Debug (16,28,56) ENTRY(debug_vector) DBG_FAULT(29) FAULT(29) END(debug_vector) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x5b00 Entry 31 (size 16 bundles) Unsupported Data Reference (57) DBG_FAULT(31) FAULT(31) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x5c00 Entry 32 (size 16 bundles) Floating-Point Fault (64) DBG_FAULT(32) FAULT(32) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x5d00 Entry 33 (size 16 bundles) Floating Point Trap (66) DBG_FAULT(33) FAULT(33) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x5e00 Entry 34 (size 16 bundles) Lower Privilege Tranfer Trap (66) DBG_FAULT(34) FAULT(34) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x5f00 Entry 35 (size 16 bundles) Taken Branch Trap (68) DBG_FAULT(35) FAULT(35) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6000 Entry 36 (size 16 bundles) Single Step Trap (69) DBG_FAULT(36) FAULT(36) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6100 Entry 37 (size 16 bundles) Reserved DBG_FAULT(37) FAULT(37) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6200 Entry 38 (size 16 bundles) Reserved DBG_FAULT(38) FAULT(38) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6300 Entry 39 (size 16 bundles) Reserved DBG_FAULT(39) FAULT(39) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6400 Entry 40 (size 16 bundles) Reserved DBG_FAULT(40) FAULT(40) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6500 Entry 41 (size 16 bundles) Reserved DBG_FAULT(41) FAULT(41) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6600 Entry 42 (size 16 bundles) Reserved DBG_FAULT(42) FAULT(42) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6700 Entry 43 (size 16 bundles) Reserved DBG_FAULT(43) FAULT(43) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6800 Entry 44 (size 16 bundles) Reserved DBG_FAULT(44) FAULT(44) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 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) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6c00 Entry 48 (size 16 bundles) Reserved DBG_FAULT(48) FAULT(48) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6d00 Entry 49 (size 16 bundles) Reserved DBG_FAULT(49) FAULT(49) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6e00 Entry 50 (size 16 bundles) Reserved DBG_FAULT(50) FAULT(50) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x6f00 Entry 51 (size 16 bundles) Reserved DBG_FAULT(51) FAULT(51) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7000 Entry 52 (size 16 bundles) Reserved DBG_FAULT(52) FAULT(52) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7100 Entry 53 (size 16 bundles) Reserved DBG_FAULT(53) FAULT(53) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7200 Entry 54 (size 16 bundles) Reserved DBG_FAULT(54) FAULT(54) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7300 Entry 55 (size 16 bundles) Reserved DBG_FAULT(55) FAULT(55) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7400 Entry 56 (size 16 bundles) Reserved DBG_FAULT(56) FAULT(56) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7500 Entry 57 (size 16 bundles) Reserved DBG_FAULT(57) FAULT(57) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7600 Entry 58 (size 16 bundles) Reserved DBG_FAULT(58) FAULT(58) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7700 Entry 59 (size 16 bundles) Reserved DBG_FAULT(59) FAULT(59) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7800 Entry 60 (size 16 bundles) Reserved DBG_FAULT(60) FAULT(60) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7900 Entry 61 (size 16 bundles) Reserved DBG_FAULT(61) FAULT(61) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7a00 Entry 62 (size 16 bundles) Reserved DBG_FAULT(62) FAULT(62) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7b00 Entry 63 (size 16 bundles) Reserved DBG_FAULT(63) FAULT(63) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7c00 Entry 64 (size 16 bundles) Reserved DBG_FAULT(64) FAULT(64) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7d00 Entry 65 (size 16 bundles) Reserved DBG_FAULT(65) FAULT(65) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7e00 Entry 66 (size 16 bundles) Reserved DBG_FAULT(66) FAULT(66) .align 256 ///////////////////////////////////////////////////////////////////////////////////////// // 0x7f00 Entry 67 (size 16 bundles) Reserved DBG_FAULT(67) FAULT(67)