[src/trunk]: src/sys/arch/arm Support PMAP_FAULTINFO on arm

[skrll <skrll%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0b855800706a
branches:  trunk
changeset: 1008622:0b855800706a
user:      skrll <skrll%NetBSD.org@localhost>
date:      Sun Mar 29 09:10:26 2020 +0000

description:
Support PMAP_FAULTINFO on arm

diffstat:

 sys/arch/arm/arm32/fault.c |  31 +++++++++++++++++++++++++++++--
 sys/arch/arm/arm32/pmap.c  |  10 ++++++++--
 sys/arch/arm/include/pcb.h |   9 +++++++++
 3 files changed, 46 insertions(+), 4 deletions(-)

diffs (109 lines):

diff -r ce605eabff6b -r 0b855800706a sys/arch/arm/arm32/fault.c
--- a/sys/arch/arm/arm32/fault.c        Sun Mar 29 09:06:38 2020 +0000
+++ b/sys/arch/arm/arm32/fault.c        Sun Mar 29 09:10:26 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: fault.c,v 1.110 2020/02/24 12:38:57 rin Exp $  */
+/*     $NetBSD: fault.c,v 1.111 2020/03/29 09:10:26 skrll Exp $        */
 
 /*
  * Copyright 2003 Wasabi Systems, Inc.
@@ -81,7 +81,7 @@
 #include "opt_kgdb.h"
 
 #include <sys/types.h>
-__KERNEL_RCSID(0, "$NetBSD: fault.c,v 1.110 2020/02/24 12:38:57 rin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: fault.c,v 1.111 2020/03/29 09:10:26 skrll Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -468,6 +468,33 @@
                dab_fatal(tf, fsr, far, l, NULL);
        }
 
+#ifdef PMAP_FAULTINFO
+       struct pcb_faultinfo * const pfi = &pcb->pcb_faultinfo;
+       struct proc * const p = curproc;
+
+       if (p->p_pid == pfi->pfi_lastpid && va == pfi->pfi_faultaddr) {
+               if (++pfi->pfi_repeats > 4) {
+                       tlb_asid_t asid = tlb_get_asid();
+                       pt_entry_t *ptep = pfi->pfi_faultptep;
+
+                       printf("%s: fault #%u (%x/%s) for %#" PRIxVADDR
+                           "(%#x) at pc %#" PRIxREGISTER " curpid=%u/%u "
+                           "ptep@%p=%#" PRIxPTE ")\n", __func__,
+                           pfi->pfi_repeats, fsr & FAULT_TYPE_MASK,
+                           data_aborts[fsr & FAULT_TYPE_MASK].desc, va,
+                           far, tf->tf_pc, map->pmap->pm_pai[0].pai_asid,
+                           asid, ptep, ptep ? *ptep : 0);
+                       cpu_Debugger();
+               }
+       } else {
+               pfi->pfi_lastpid = p->p_pid;
+               pfi->pfi_faultaddr = va;
+               pfi->pfi_repeats = 0;
+               pfi->pfi_faultptep = NULL;
+               pfi->pfi_faulttype = fsr & FAULT_TYPE_MASK;
+       }
+#endif /* PMAP_FAULTINFO */
+
        onfault = pcb->pcb_onfault;
        pcb->pcb_onfault = NULL;
        error = uvm_fault(map, va, ftype);
diff -r ce605eabff6b -r 0b855800706a sys/arch/arm/arm32/pmap.c
--- a/sys/arch/arm/arm32/pmap.c Sun Mar 29 09:06:38 2020 +0000
+++ b/sys/arch/arm/arm32/pmap.c Sun Mar 29 09:10:26 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.c,v 1.400 2020/03/23 16:38:29 skrll Exp $ */
+/*     $NetBSD: pmap.c,v 1.401 2020/03/29 09:10:26 skrll Exp $ */
 
 /*
  * Copyright 2003 Wasabi Systems, Inc.
@@ -198,7 +198,7 @@
 #endif
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.400 2020/03/23 16:38:29 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.401 2020/03/29 09:10:26 skrll Exp $");
 
 #include <sys/atomic.h>
 #include <sys/param.h>
@@ -3466,6 +3466,12 @@
        UVMHIST_LOG(maphist, " (pm=%#jx, sva=%#jx, eva=%#jx)",
            (uintptr_t)pm, sva, eva, 0);
 
+#ifdef PMAP_FAULTINFO
+       curpcb->pcb_faultinfo.pfi_faultaddr = 0;
+       curpcb->pcb_faultinfo.pfi_repeats = 0;
+       curpcb->pcb_faultinfo.pfi_faultptep = NULL;
+#endif
+
        SLIST_INIT(&opv_list);
        /*
         * we lock in the pmap => pv_head direction
diff -r ce605eabff6b -r 0b855800706a sys/arch/arm/include/pcb.h
--- a/sys/arch/arm/include/pcb.h        Sun Mar 29 09:06:38 2020 +0000
+++ b/sys/arch/arm/include/pcb.h        Sun Mar 29 09:10:26 2020 +0000
@@ -41,6 +41,14 @@
 #include <arm/arm32/pte.h>
 #include <arm/reg.h>
 
+struct pcb_faultinfo {
+       void *pfi_faultptep;
+       vaddr_t pfi_faultaddr;
+       u_int pfi_repeats;
+       pid_t pfi_lastpid;
+       uint8_t pfi_faulttype;
+};
+
 #define        pcb_ksp         pcb_sp
 
 struct pcb {
@@ -68,6 +76,7 @@
        void *  pcb_onfault;                    /* On fault handler */
        struct  vfpreg pcb_vfp;                 /* VFP registers */
        struct  vfpreg pcb_kernel_vfp;          /* kernel VFP state */
+       struct  pcb_faultinfo pcb_faultinfo;
 };
 
 /*