So, my first patch for this list....please be gentle with me :). I was having to read ivt.S quite a bit and the old formatting just finally got to me; this patch rearranges comments so that everything can be seen on an 80-column display, in line with Linux coding style. No instructions have been changed. With any luck, I didn't screw up any of the white space otherwise. Signed-off-by: Al Stone <ahs3@xxxxxxxxx> diff --git a/arch/ia64/kernel/ivt.S b/arch/ia64/kernel/ivt.S index 6b7fcbd..d4ac622 100644 --- a/arch/ia64/kernel/ivt.S +++ b/arch/ia64/kernel/ivt.S @@ -11,7 +11,8 @@ * Fenghua Yu <fenghua.yu@xxxxxxxxx> * * 00/08/23 Asit Mallick <asit.k.mallick@xxxxxxxxx> TLB handling for SMP - * 00/12/20 David Mosberger-Tang <davidm@xxxxxxxxxx> DTLB/ITLB handler now uses virtual PT. + * 00/12/20 David Mosberger-Tang <davidm@xxxxxxxxxx> DTLB/ITLB handler now + * uses virtual PT. */ /* * This file defines the interruption vector table used by the CPU. @@ -60,19 +61,23 @@ #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... + * 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 +# 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 */ \ +#define FAULT(n) \ + mov r31=pr; \ + mov r19=n;; /* prepare to save predicates */ \ br.sptk.many dispatch_to_fault_handler .section .text.ivt,"ax" @@ -80,39 +85,39 @@ #define FAULT(n) \ .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). + * 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. + * 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 entries 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 + 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 + 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 @@ -125,70 +130,77 @@ (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 + 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 +(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 + 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? +(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 + shr.u r28=r22,PUD_SHIFT // shift pud index into position #else - shr.u r18=r22,PMD_SHIFT // shift pmd index into position + shr.u r18=r22,PMD_SHIFT // shift pmd index into position #endif ;; - ld8 r17=[r17] // get *pgd (may be 0) + ld8 r17=[r17] // get *pgd (may be 0) ;; -(p7) cmp.eq p6,p7=r17,r0 // was pgd_present(*pgd) == NULL? +(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) + 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) + 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) +(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) + 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) +(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 +(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. + * 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 ;; @@ -196,15 +208,15 @@ (p7) itc.d r24 ;; #ifdef CONFIG_SMP /* - * Tell the assemblers dependency-violation checker that the above "itc" instructions - * cannot possibly affect the following loads: + * 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: + * 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) @@ -238,7 +250,7 @@ #endif END(vhpt_miss) .org ia64_ivt+0x400 -///////////////////////////////////////////////////////////////////////////////////////// +////////////////////////////////////////////////////////////////////////// // 0x0400 Entry 1 (size 64 bundles) ITLB (21) ENTRY(itlb_miss) DBG_FAULT(1) @@ -253,7 +265,8 @@ ENTRY(itlb_miss) mov r31=pr // save predicates .itlb_fault: mov r17=cr.iha // get virtual address of PTE - movl r30=1f // load nested fault continuation point + movl r30=1f // load nested fault + // continuation point ;; 1: ld8 r18=[r17] // read *pte ;; @@ -265,13 +278,13 @@ (p6) br.cond.spnt page_fault ;; #ifdef CONFIG_SMP /* - * Tell the assemblers dependency-violation checker that the above "itc" instructions - * cannot possibly affect the following loads: + * 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 + 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 ;; @@ -282,7 +295,7 @@ #endif END(itlb_miss) .org ia64_ivt+0x0800 -///////////////////////////////////////////////////////////////////////////////////////// +////////////////////////////////////////////////////////////////////////// // 0x0800 Entry 2 (size 64 bundles) DTLB (9,48) ENTRY(dtlb_miss) DBG_FAULT(2) @@ -297,7 +310,8 @@ ENTRY(dtlb_miss) mov r31=pr // save predicates dtlb_fault: mov r17=cr.iha // get virtual address of PTE - movl r30=1f // load nested fault continuation point + movl r30=1f // load nested fault + // continuation point ;; 1: ld8 r18=[r17] // read *pte ;; @@ -309,13 +323,13 @@ (p6) br.cond.spnt page_fault ;; #ifdef CONFIG_SMP /* - * Tell the assemblers dependency-violation checker that the above "itc" instructions - * cannot possibly affect the following loads: + * 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 + 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 ;; @@ -326,7 +340,7 @@ #endif END(dtlb_miss) .org ia64_ivt+0x0c00 -///////////////////////////////////////////////////////////////////////////////////////// +////////////////////////////////////////////////////////////////////////// // 0x0c00 Entry 3 (size 64 bundles) Alt ITLB (19) ENTRY(alt_itlb_miss) DBG_FAULT(3) @@ -337,14 +351,14 @@ ENTRY(alt_itlb_miss) mov r31=pr ;; #ifdef CONFIG_DISABLE_VHPT - shr.u r22=r16,61 // get the region number into r21 + shr.u r22=r16,61 // get the region number into r21 ;; - cmp.gt p8,p0=6,r22 // user mode + cmp.gt p8,p0=6,r22 // user mode ;; (p8) thash r17=r16 ;; (p8) mov cr.iha=r17 -(p8) mov r29=b0 // save b0 +(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 @@ -355,7 +369,8 @@ #endif 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 + 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 @@ -364,7 +379,7 @@ (p8) br.cond.spnt page_fault 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) @@ -376,21 +391,22 @@ ENTRY(alt_dtlb_miss) mov r31=pr ;; #ifdef CONFIG_DISABLE_VHPT - shr.u r22=r16,61 // get the region number into r21 + shr.u r22=r16,61 // get the region number into r21 ;; - cmp.gt p8,p0=6,r22 // access to region 0-5 + 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) 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 + 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) @@ -401,7 +417,8 @@ (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 + 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 @@ -410,18 +427,19 @@ (p7) itc.d r19 // insert the TLB entry 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). + * 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 @@ -435,71 +453,74 @@ ENTRY(nested_dtlb_miss) * * 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 + 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 + 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 + 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 +(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 + 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? +(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 + shr.u r18=r22,PUD_SHIFT // shift pud index into position #else - shr.u r18=r22,PMD_SHIFT // shift pmd index into position + shr.u r18=r22,PMD_SHIFT // shift pmd index into position #endif ;; - ld8 r17=[r17] // get *pgd (may be 0) + 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) +(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) 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) +(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) 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); +(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 + 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) + //---------------------------------------------------------------- + // call do_page_fault (predicates are in r31, psr.dt may be off, + // r16 is faulting address) ENTRY(page_fault) ssm psr.dt ;; @@ -509,24 +530,25 @@ ENTRY(page_fault) 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 + adds r3=8,r2 // set up second base pointer ;; ssm psr.ic | PSR_DEFAULT_BITS ;; - srlz.i // guarantee that interruption collectin is on + srlz.i // guarantee that interruption + // collection is on ;; -(p15) ssm psr.i // restore psr.i +(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 + 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) @@ -534,77 +556,83 @@ ENTRY(dkey_miss) 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. + * 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 + 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 + 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 + ;; // 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 +(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 +(p6) cmp.eq p6,p7=r26,r18 // Only compare if page is present ;; -(p6) itc.d r25 // install updated PTE +(p6) itc.d r25 // install updated PTE ;; /* - * Tell the assemblers dependency-violation checker that the above "itc" instructions - * cannot possibly affect the following loads: + * 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 + ld8 r18=[r17] // read PTE again ;; - cmp.eq p6,p7=r18,r25 // is it same as the newly installed + cmp.eq p6,p7=r18,r25 // is it same as the newly installed ;; (p7) ptc.l r16,r24 - mov b0=r29 // restore b0 + 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 + ;; // 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 + st8 [r17]=r18 // store back updated PTE + itc.d r18 // install updated PTE #endif - mov pr=r31,-1 // restore pr + 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 + 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. @@ -612,245 +640,267 @@ #ifdef CONFIG_ITANIUM mov r17=cr.ipsr ;; mov r18=cr.iip - tbit.z p6,p0=r17,IA64_PSR_IS_BIT // IA64 instruction set? + 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 +(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) + 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 + 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 + 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 +(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 +(p6) cmp.eq p6,p7=r26,r18 // Only if page present ;; -(p6) itc.i r25 // install updated PTE +(p6) itc.i r25 // install updated PTE ;; /* - * Tell the assemblers dependency-violation checker that the above "itc" instructions - * cannot possibly affect the following loads: + * 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 + ld8 r18=[r17] // read PTE again ;; - cmp.eq p6,p7=r18,r25 // is it same as the newly installed + cmp.eq p6,p7=r18,r25 // is it same as the newly installed ;; (p7) ptc.l r16,r24 - mov b0=r29 // restore b0 + 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 + 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 + 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 + 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 + thash r17=r16 // compute virtual address of L3 PTE mov r31=pr - mov r29=b0 // save b0 in case of nested fault) + mov r29=b0 // save b0 in case of nested fault) #ifdef CONFIG_SMP - mov r28=ar.ccv // save ar.ccv + 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 + ;; // 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 +(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 +(p6) cmp.eq p6,p7=r26,r18 // Only if page is present ;; -(p6) itc.d r25 // install updated PTE +(p6) itc.d r25 // install updated PTE /* - * Tell the assemblers dependency-violation checker that the above "itc" instructions - * cannot possibly affect the following loads: + * 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 + ld8 r18=[r17] // read PTE again ;; - cmp.eq p6,p7=r18,r25 // is it same as the newly installed + 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 + ;; // 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 + st8 [r17]=r18 // store back updated PTE + itc.d r18 // install updated PTE #endif - mov b0=r29 // restore b0 + 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. + * 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 + * 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. + * 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.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 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 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) + 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 + invala // M0|1 + nop.m 0 // M + mov r20=r1 // A save r1 nop.m 0 - movl r30=sys_call_table // X + 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 -> + 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 + 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 + 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 + 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? + 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? + 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? + 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) 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 +(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 + 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 + 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? +(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 + 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 + 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 + 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 + 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 +(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: + // 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 + 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 + 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) @@ -877,22 +927,22 @@ ENTRY(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... + * 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 move + * 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 @@ -939,11 +989,11 @@ 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 + 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 + 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 @@ -966,8 +1016,8 @@ (p8) mov in0=-1 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 + 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 ;; @@ -980,18 +1030,20 @@ (pKStk) adds r17=PT(B0)-PT(AR_BSPSTORE), tnat.nz p11,p0=in3 ;; (p10) mov in2=-1 - tnat.nz p12,p0=in4 // [I0] + 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" + 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] + tnat.nz p13,p0=in5 // [I0] ;; - st8 [r16]=r18,PT(R12)-PT(LOADRS) // save ar.rsc value for "loadrs" + 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 ;; @@ -1006,29 +1058,31 @@ (p13) mov in5=-1 ;; mov r8=1 (p9) tnat.nz p10,p0=r15 - adds r12=-16,r1 // switch to kernel memory stack (with 16 bytes of scratch) + adds r12=-16,r1 // switch to kernel memory stack (with 16 + // bytes of scratch) - st8.spill [r17]=r15 // save r15 + 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 + mov r13=r2 // establish `current' + movl r1=__gp // establish kernel global pointer ;; - st8 [r16]=r8 // ensure pt_regs.r8 != 0 (see handle_syscall_error) + 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 + 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 + 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) @@ -1036,11 +1090,12 @@ END(ia64_syscall_setup) /* * 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. + * 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 @@ -1076,71 +1131,74 @@ (p6) br.call.dpnt.many b6=b6 // call re 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 + 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... + // 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 move + // 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 + 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 + srlz.i // guarantee that interruption collection is on ;; -(p15) ssm psr.i // restore psr.i +(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 + 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... + * 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 move + * 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!) + 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 + srlz.i // guarantee that interruption + // collection is on ;; -(p15) ssm psr.i // restore psr.i - adds r3=8,r2 // set up second base pointer +(p15) ssm psr.i // restore psr.i + adds r3=8,r2 // set up second base pointer ;; SAVE_REST movl r14=ia64_leave_kernel @@ -1150,16 +1208,16 @@ (p15) ssm psr.i // restore psr.i 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... + * 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 move + * the following code to a more suitable spot... */ ENTRY(dispatch_to_fault_handler) @@ -1179,10 +1237,12 @@ ENTRY(dispatch_to_fault_handler) ;; ssm psr.ic | PSR_DEFAULT_BITS ;; - srlz.i // guarantee that interruption collection is on + 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 +(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 @@ -1196,15 +1256,16 @@ END(dispatch_to_fault_handler) // .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. + * 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 ;; @@ -1216,7 +1277,7 @@ ENTRY(page_not_present) 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) @@ -1229,7 +1290,7 @@ ENTRY(key_permission) END(key_permission) .org ia64_ivt+0x5200 -///////////////////////////////////////////////////////////////////////////////////////// +////////////////////////////////////////////////////////////////////////// // 0x5200 Entry 22 (size 16 bundles) Instruction Access Rights (26) ENTRY(iaccess_rights) DBG_FAULT(22) @@ -1242,7 +1303,7 @@ ENTRY(iaccess_rights) END(iaccess_rights) .org ia64_ivt+0x5300 -///////////////////////////////////////////////////////////////////////////////////////// +////////////////////////////////////////////////////////////////////////// // 0x5300 Entry 23 (size 16 bundles) Data Access Rights (14,53) ENTRY(daccess_rights) DBG_FAULT(23) @@ -1255,7 +1316,7 @@ ENTRY(daccess_rights) 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) @@ -1270,7 +1331,7 @@ (p6) br.sptk.many dispatch_illegal_op_fa END(general_exception) .org ia64_ivt+0x5500 -///////////////////////////////////////////////////////////////////////////////////////// +////////////////////////////////////////////////////////////////////////// // 0x5500 Entry 25 (size 16 bundles) Disabled FP-Register (35) ENTRY(disabled_fp_reg) DBG_FAULT(25) @@ -1283,7 +1344,7 @@ ENTRY(disabled_fp_reg) 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) @@ -1297,7 +1358,8 @@ ENTRY(nat_consumption) ;; 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) +(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 @@ -1310,17 +1372,18 @@ (p6) br.cond.spnt 1f // branch if (cr.i 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. + * 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) */ @@ -1347,13 +1410,13 @@ ENTRY(speculation_vector) 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) @@ -1361,7 +1424,7 @@ ENTRY(debug_vector) END(debug_vector) .org ia64_ivt+0x5a00 -///////////////////////////////////////////////////////////////////////////////////////// +////////////////////////////////////////////////////////////////////////// // 0x5a00 Entry 30 (size 16 bundles) Unaligned Reference (57) ENTRY(unaligned_access) DBG_FAULT(30) @@ -1371,7 +1434,7 @@ ENTRY(unaligned_access) END(unaligned_access) .org ia64_ivt+0x5b00 -///////////////////////////////////////////////////////////////////////////////////////// +////////////////////////////////////////////////////////////////////////// // 0x5b00 Entry 31 (size 16 bundles) Unsupported Data Reference (57) ENTRY(unsupported_data_reference) DBG_FAULT(31) @@ -1379,7 +1442,7 @@ ENTRY(unsupported_data_reference) 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) @@ -1387,7 +1450,7 @@ ENTRY(floating_point_fault) 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) @@ -1395,7 +1458,7 @@ ENTRY(floating_point_trap) 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) @@ -1403,7 +1466,7 @@ ENTRY(lower_privilege_trap) 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) @@ -1411,7 +1474,7 @@ ENTRY(taken_branch_trap) 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) @@ -1419,63 +1482,65 @@ ENTRY(single_step_trap) 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) +////////////////////////////////////////////////////////////////////////// +// 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) @@ -1505,7 +1570,7 @@ #endif // CONFIG_IA32_SUPPORT END(ia32_intercept) .org ia64_ivt+0x6b00 -///////////////////////////////////////////////////////////////////////////////////////// +////////////////////////////////////////////////////////////////////////// // 0x6b00 Entry 47 (size 16 bundles) IA-32 Interrupt (74) ENTRY(ia32_interrupt) DBG_FAULT(47) @@ -1518,121 +1583,121 @@ #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) @@ -1640,10 +1705,10 @@ END(ia32_interrupt) #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... + * 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 move + * the following code to a more suitable spot... */ // IA32 interrupt entry point @@ -1654,7 +1719,7 @@ ENTRY(dispatch_to_ia32_handler) mov r14=cr.isr ssm psr.ic | PSR_DEFAULT_BITS ;; - srlz.i // guarantee that interruption collection is on + srlz.i // guarantee that interruption collection is on ;; (p15) ssm psr.i adds r3=8,r2 // Base pointer for SAVE_REST @@ -1667,13 +1732,15 @@ (p15) ssm psr.i 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 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) + 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 ;; @@ -1714,7 +1781,7 @@ 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 + ;; // avoid WAW on CFM br.call.sptk.many rp=ia32_bad_interrupt .ret1: movl r15=ia64_leave_kernel ;; -- Ciao, al ---------------------------------------------------------------------- Al Stone Alter Ego: Open Source and Linux R&D Debian Developer Hewlett-Packard Company http://www.debian.org E-mail: ahs3@xxxxxxxxx ahs3@xxxxxxxxxx ---------------------------------------------------------------------- - : send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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