sys/dev/hwpmc/hwpmc_arm.c

   1 /*-
   2  * Copyright (c) 2005, Joseph Koshy
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/param.h>
  32 #include <sys/pmc.h>
  33 #include <sys/proc.h>
  34 #include <sys/systm.h>
  35
  36 #include <machine/cpu.h>
  37 #include <machine/md_var.h>
  38 #include <machine/pmc_mdep.h>
  39 #include <machine/stack.h>
  40
  41 #include <vm/vm.h>
  42 #include <vm/vm_param.h>
  43 #include <vm/pmap.h>
  44
  45 struct pmc_mdep *
  46 pmc_md_initialize()
  47 {
  48 #ifdef CPU_XSCALE_IXP425
  49         if (cpu_class == CPU_CLASS_XSCALE)
  50                 return pmc_xscale_initialize();
  51 #endif
  52 #ifdef CPU_CORTEXA
  53         if (cpu_class == CPU_CLASS_CORTEXA)
  54                 return pmc_armv7_initialize();
  55 #endif
  56         return NULL;
  57 }
  58
  59 void
  60 pmc_md_finalize(struct pmc_mdep *md)
  61 {
  62 #ifdef CPU_XSCALE_IXP425
  63         if (cpu_class == CPU_CLASS_XSCALE)
  64                 pmc_xscale_finalize(md);
  65         else
  66                 KASSERT(0, ("[arm,%d] Unknown CPU Class 0x%x", __LINE__,
  67                     cpu_class));
  68 #endif
  69 #ifdef CPU_CORTEXA
  70         if (cpu_class == CPU_CLASS_CORTEXA)
  71                 pmc_armv7_finalize(md);
  72 #endif
  73 }
  74
  75 int
  76 pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
  77     struct trapframe *tf)
  78 {
  79         uintptr_t pc, r, stackstart, stackend, fp;
  80         struct thread *td;
  81         int count;
  82
  83         KASSERT(TRAPF_USERMODE(tf) == 0,("[arm,%d] not a kernel backtrace",
  84             __LINE__));
  85
  86         td = curthread;
  87         pc = PMC_TRAPFRAME_TO_PC(tf);
  88         *cc++ = pc;
  89
  90         if (maxsamples <= 1)
  91                 return (1);
  92
  93         stackstart = (uintptr_t) td->td_kstack;
  94         stackend = (uintptr_t) td->td_kstack + td->td_kstack_pages * PAGE_SIZE;
  95         fp = PMC_TRAPFRAME_TO_FP(tf);
  96
  97         if (!PMC_IN_KERNEL(pc) ||
  98             !PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
  99                 return (1);
 100
 101         for (count = 1; count < maxsamples; count++) {
 102                 /* Use saved lr as pc. */
 103                 r = fp - sizeof(uintptr_t);
 104                 if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
 105                         break;
 106                 pc = *(uintptr_t *)r;
 107                 if (!PMC_IN_KERNEL(pc))
 108                         break;
 109
 110                 *cc++ = pc;
 111
 112                 /* Switch to next frame up */
 113                 r = fp - 3 * sizeof(uintptr_t);
 114                 if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
 115                         break;
 116                 fp = *(uintptr_t *)r;
 117                 if (!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
 118                         break;
 119         }
 120
 121         return (count);
 122 }
 123
 124 int
 125 pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
 126     struct trapframe *tf)
 127 {
 128         uintptr_t pc, r, oldfp, fp;
 129         struct thread *td;
 130         int count;
 131
 132         KASSERT(TRAPF_USERMODE(tf), ("[x86,%d] Not a user trap frame tf=%p",
 133             __LINE__, (void *) tf));
 134
 135         td = curthread;
 136         pc = PMC_TRAPFRAME_TO_PC(tf);
 137         *cc++ = pc;
 138
 139         if (maxsamples <= 1)
 140                 return (1);
 141
 142         oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);
 143
 144         if (!PMC_IN_USERSPACE(pc) ||
 145             !PMC_IN_USERSPACE(fp))
 146                 return (1);
 147
 148         for (count = 1; count < maxsamples; count++) {
 149                 /* Use saved lr as pc. */
 150                 r = fp - sizeof(uintptr_t);
 151                 if (copyin((void *)r, &pc, sizeof(pc)) != 0)
 152                         break;
 153                 if (!PMC_IN_USERSPACE(pc))
 154                         break;
 155
 156                 *cc++ = pc;
 157
 158                 /* Switch to next frame up */
 159                 oldfp = fp;
 160                 r = fp - 3 * sizeof(uintptr_t);
 161                 if (copyin((void *)r, &fp, sizeof(fp)) != 0)
 162                         break;
 163                 if (fp < oldfp || !PMC_IN_USERSPACE(fp))
 164                         break;
 165         }
 166
 167         return (count);
 168 }