db_hwwatch.c

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    1 /*-
    2  * Copyright (c) 2001 Jake Burkholder.
    3  * All rights reserved.
    4  * Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/6.0/sys/sparc64/sparc64/db_hwwatch.c 119291 2003-08-22 07:39:05Z imp $
   28  */
   29 
   30 #include <sys/param.h>
   31 
   32 #include <vm/vm.h>
   33 
   34 #include <machine/asi.h>
   35 #include <machine/cpufunc.h>
   36 #include <machine/lsu.h>
   37 #include <machine/watch.h>
   38 
   39 #include <ddb/ddb.h>
   40 #include <ddb/db_access.h>
   41 #include <ddb/db_sym.h>
   42 #include <ddb/db_variables.h>
   43 #include <ddb/db_watch.h>
   44 
   45 int  db_md_set_watchpoint(db_expr_t addr, db_expr_t size);
   46 int  db_md_clr_watchpoint(db_expr_t addr, db_expr_t size);
   47 void db_md_list_watchpoints(void);
   48 
   49 static void db_watch_print(vm_offset_t wp, int bm);
   50 
   51 int
   52 watch_phys_set_mask(vm_paddr_t pa, u_long mask)
   53 {
   54         u_long lsucr;
   55 
   56         stxa_sync(AA_DMMU_PWPR, ASI_DMMU, pa & (((2UL << 38) - 1) << 3));
   57         lsucr = ldxa(0, ASI_LSU_CTL_REG);
   58         lsucr = ((lsucr | LSU_PW) & ~LSU_PM_MASK) |
   59             (mask << LSU_PM_SHIFT);
   60         stxa_sync(0, ASI_LSU_CTL_REG, lsucr);
   61         return (0);
   62 }
   63 
   64 int
   65 watch_phys_set(vm_paddr_t pa, int sz)
   66 {
   67         u_long off;
   68 
   69         off = (u_long)pa & 7;
   70         /* Test for misaligned watch points. */
   71         if (off + sz > 8)
   72                 return (-1);
   73         return (watch_phys_set_mask(pa, ((1 << sz) - 1) << off));
   74 }
   75 
   76 vm_paddr_t
   77 watch_phys_get(int *bm)
   78 {
   79         vm_paddr_t pa;
   80         u_long lsucr;
   81         
   82         if (!watch_phys_active())
   83                 return (0);
   84 
   85         pa = ldxa(AA_DMMU_PWPR, ASI_DMMU);
   86         lsucr = ldxa(0, ASI_LSU_CTL_REG);
   87         *bm = (lsucr & LSU_PM_MASK) >> LSU_PM_SHIFT;
   88         
   89         return (pa);
   90 }
   91 
   92 void
   93 watch_phys_clear()
   94 {
   95         stxa_sync(0, ASI_LSU_CTL_REG,
   96             ldxa(0, ASI_LSU_CTL_REG) & ~LSU_PW);
   97 }
   98 
   99 int
  100 watch_phys_active()
  101 {
  102 
  103         return (ldxa(0, ASI_LSU_CTL_REG) & LSU_PW);
  104 }
  105 
  106 int
  107 watch_virt_set_mask(vm_offset_t va, u_long mask)
  108 {
  109         u_long lsucr;
  110 
  111         stxa_sync(AA_DMMU_VWPR, ASI_DMMU, va & (((2UL << 41) - 1) << 3));
  112         lsucr = ldxa(0, ASI_LSU_CTL_REG);
  113         lsucr = ((lsucr | LSU_VW) & ~LSU_VM_MASK) |
  114             (mask << LSU_VM_SHIFT);
  115         stxa_sync(0, ASI_LSU_CTL_REG, lsucr);
  116         return (0);
  117 }
  118 
  119 int
  120 watch_virt_set(vm_offset_t va, int sz)
  121 {
  122         u_long off;
  123 
  124         off = (u_long)va & 7;
  125         /* Test for misaligned watch points. */
  126         if (off + sz > 8)
  127                 return (-1);
  128         return (watch_virt_set_mask(va, ((1 << sz) - 1) << off));
  129 }
  130 
  131 vm_offset_t
  132 watch_virt_get(int *bm)
  133 {
  134         u_long va;
  135         u_long lsucr;
  136         
  137         if (!watch_virt_active())
  138                 return (0);
  139 
  140         va = ldxa(AA_DMMU_VWPR, ASI_DMMU);
  141         lsucr = ldxa(0, ASI_LSU_CTL_REG);
  142         *bm = (lsucr & LSU_VM_MASK) >> LSU_VM_SHIFT;
  143         
  144         return ((vm_offset_t)va);
  145 }
  146 
  147 void
  148 watch_virt_clear()
  149 {
  150         stxa_sync(0, ASI_LSU_CTL_REG,
  151             ldxa(0, ASI_LSU_CTL_REG) & ~LSU_VW);
  152 }
  153 
  154 int
  155 watch_virt_active()
  156 {
  157 
  158         return (ldxa(0, ASI_LSU_CTL_REG) & LSU_VW);
  159 }
  160 
  161 int
  162 db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
  163 {
  164         int dummy;
  165 
  166         if (watch_virt_active()) {
  167                 db_printf("Overwriting previously active watch point at "
  168                     "0x%lx\n", watch_virt_get(&dummy));
  169         }
  170         return (watch_virt_set(addr, size));
  171 }
  172 
  173 int
  174 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
  175 {
  176 
  177         watch_virt_clear();
  178         return (0);
  179 }
  180 
  181 void
  182 db_watch_print(vm_offset_t wp, int bm)
  183 {
  184         int i;
  185 
  186         db_printf("\tat 0x%lx, active bytes: ", (u_long)wp);
  187         for (i = 0; i < 8; i++) {
  188                 if ((bm & (1 << i)) != 0)
  189                         db_printf("%d ", i);
  190         }
  191         if (bm == 0)
  192                 db_printf("none");
  193         db_printf("\n");
  194 }
  195 
  196 void
  197 db_md_list_watchpoints(void)
  198 {
  199         vm_offset_t va;
  200         vm_paddr_t pa;
  201         int bm;
  202 
  203         db_printf("Physical address watchpoint:\n");
  204         if (watch_phys_active()) {
  205                 pa = watch_phys_get(&bm);
  206                 db_watch_print(pa, bm);
  207         } else
  208                 db_printf("\tnot active.\n");
  209         db_printf("Virtual address watchpoint:\n");
  210         if (watch_virt_active()) {
  211                 va = watch_virt_get(&bm);
  212                 db_watch_print(va, bm);
  213         } else
  214                 db_printf("\tnot active.\n");
  215 }

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FreeBSD/Linux Kernel Cross Reference sys/sparc64/sparc64/db_hwwatch.c

FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/db_hwwatch.c