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
  40 #include <vm/vm.h>
  41 #include <vm/vm_param.h>
  42 #include <vm/pmap.h>
  43
  44 struct pmc_mdep *
  45 pmc_md_initialize()
  46 {
  47 #ifdef CPU_XSCALE_IXP425
  48         if (cpu_class == CPU_CLASS_XSCALE)
  49                 return pmc_xscale_initialize();
  50         else
  51 #endif
  52                 return NULL;
  53 }
  54
  55 void
  56 pmc_md_finalize(struct pmc_mdep *md)
  57 {
  58 #ifdef CPU_XSCALE_IXP425
  59         if (cpu_class == CPU_CLASS_XSCALE)
  60                 pmc_xscale_finalize(md);
  61         else
  62                 KASSERT(0, ("[arm,%d] Unknown CPU Class 0x%x", __LINE__,
  63                     cpu_class));
  64 #endif
  65 }
  66
  67 int
  68 pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
  69     struct trapframe *tf)
  70 {
  71         uintptr_t pc, r, stackstart, stackend, fp;
  72         struct thread *td;
  73         int count;
  74
  75         KASSERT(TRAPF_USERMODE(tf) == 0,("[arm,%d] not a kernel backtrace",
  76             __LINE__));
  77
  78         pc = PMC_TRAPFRAME_TO_PC(tf);
  79         *cc++ = pc;
  80
  81         if ((td = curthread) == NULL)
  82                 return (1);
  83
  84         if (maxsamples <= 1)
  85                 return (1);
  86
  87         stackstart = (uintptr_t) td->td_kstack;
  88         stackend = (uintptr_t) td->td_kstack + td->td_kstack_pages * PAGE_SIZE;
  89         fp = PMC_TRAPFRAME_TO_FP(tf);
  90
  91         if (!PMC_IN_KERNEL(pc) ||
  92             !PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
  93                 return (1);
  94
  95         for (count = 1; count < maxsamples; count++) {
  96                 /* Use saved lr as pc. */
  97                 r = fp - sizeof(uintptr_t);
  98                 if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
  99                         break;
 100                 pc = *(uintptr_t *)r;
 101                 if (!PMC_IN_KERNEL(pc))
 102                         break;
 103
 104                 *cc++ = pc;
 105
 106                 /* Switch to next frame up */
 107                 r = fp - 3 * sizeof(uintptr_t);
 108                 if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
 109                         break;
 110                 fp = *(uintptr_t *)r;
 111                 if (!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
 112                         break;
 113         }
 114
 115         return (count);
 116 }
 117
 118 int
 119 pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
 120     struct trapframe *tf)
 121 {
 122         uintptr_t pc, r, oldfp, fp;
 123         struct thread *td;
 124         int count;
 125
 126         KASSERT(TRAPF_USERMODE(tf), ("[x86,%d] Not a user trap frame tf=%p",
 127             __LINE__, (void *) tf));
 128
 129         pc = PMC_TRAPFRAME_TO_PC(tf);
 130         *cc++ = pc;
 131
 132         if ((td = curthread) == NULL)
 133                 return (1);
 134
 135         if (maxsamples <= 1)
 136                 return (1);
 137
 138         oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);
 139
 140         if (!PMC_IN_USERSPACE(pc) ||
 141             !PMC_IN_USERSPACE(fp))
 142                 return (1);
 143
 144         for (count = 1; count < maxsamples; count++) {
 145                 /* Use saved lr as pc. */
 146                 r = fp - sizeof(uintptr_t);
 147                 if (copyin((void *)r, &pc, sizeof(pc)) != 0)
 148                         break;
 149                 if (!PMC_IN_USERSPACE(pc))
 150                         break;
 151
 152                 *cc++ = pc;
 153
 154                 /* Switch to next frame up */
 155                 oldfp = fp;
 156                 r = fp - 3 * sizeof(uintptr_t);
 157                 if (copyin((void *)r, &fp, sizeof(fp)) != 0)
 158                         break;
 159                 if (fp < oldfp || !PMC_IN_USERSPACE(fp))
 160                         break;
 161         }
 162
 163         return (count);
 164 }