fbt_isa.c

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    1 /*
    2  * CDDL HEADER START
    3  *
    4  * The contents of this file are subject to the terms of the
    5  * Common Development and Distribution License (the "License").
    6  * You may not use this file except in compliance with the License.
    7  *
    8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
    9  * or http://www.opensolaris.org/os/licensing.
   10  * See the License for the specific language governing permissions
   11  * and limitations under the License.
   12  *
   13  * When distributing Covered Code, include this CDDL HEADER in each
   14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   15  * If applicable, add the following below this CDDL HEADER, with the
   16  * fields enclosed by brackets "[]" replaced with your own identifying
   17  * information: Portions Copyright [yyyy] [name of copyright owner]
   18  *
   19  * CDDL HEADER END
   20  *
   21  * Portions Copyright 2006-2008 John Birrell jb@freebsd.org
   22  * Portions Copyright 2013 Justin Hibbits jhibbits@freebsd.org
   23  * Portions Copyright 2013 Howard Su howardsu@freebsd.org
   24  *
   25  * $FreeBSD$
   26  *
   27  */
   28 
   29 /*
   30  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   31  * Use is subject to license terms.
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 #include <sys/param.h>
   36 
   37 #include <sys/dtrace.h>
   38 #include <machine/stack.h>
   39 #include <machine/trap.h>
   40 
   41 #include "fbt.h"
   42 
   43 #define FBT_PUSHM               0xe92d0000
   44 #define FBT_POPM                0xe8bd0000
   45 #define FBT_JUMP                0xea000000
   46 #define FBT_SUBSP               0xe24dd000
   47 
   48 #define FBT_ENTRY       "entry"
   49 #define FBT_RETURN      "return"
   50 
   51 int
   52 fbt_invop(uintptr_t addr, struct trapframe *frame, uintptr_t rval)
   53 {
   54         solaris_cpu_t *cpu = &solaris_cpu[curcpu];
   55         fbt_probe_t *fbt = fbt_probetab[FBT_ADDR2NDX(addr)];
   56         register_t fifthparam;
   57 
   58         for (; fbt != NULL; fbt = fbt->fbtp_hashnext) {
   59                 if ((uintptr_t)fbt->fbtp_patchpoint != addr)
   60                         continue;
   61 
   62                 cpu->cpu_dtrace_caller = addr;
   63 
   64                 if (fbt->fbtp_roffset == 0) {
   65                         /* Get 5th parameter from stack */
   66                         DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
   67                         fifthparam = *(register_t *)frame->tf_svc_sp;
   68                         DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | CPU_DTRACE_BADADDR);
   69 
   70                         dtrace_probe(fbt->fbtp_id, frame->tf_r0,
   71                             frame->tf_r1, frame->tf_r2,
   72                             frame->tf_r3, fifthparam);
   73                 } else {
   74                         dtrace_probe(fbt->fbtp_id, fbt->fbtp_roffset, rval,
   75                             0, 0, 0);
   76                 }
   77 
   78                 cpu->cpu_dtrace_caller = 0;
   79                 return (fbt->fbtp_rval | (fbt->fbtp_savedval << DTRACE_INVOP_SHIFT));
   80         }
   81 
   82         return (0);
   83 }
   84 
   85 void
   86 fbt_patch_tracepoint(fbt_probe_t *fbt, fbt_patchval_t val)
   87 {
   88 
   89         *fbt->fbtp_patchpoint = val;
   90         icache_sync((vm_offset_t)fbt->fbtp_patchpoint, sizeof(val));
   91 }
   92 
   93 int
   94 fbt_provide_module_function(linker_file_t lf, int symindx,
   95     linker_symval_t *symval, void *opaque)
   96 {
   97         char *modname = opaque;
   98         const char *name = symval->name;
   99         fbt_probe_t *fbt, *retfbt;
  100         uint32_t *instr, *limit;
  101         int popm;
  102 
  103         if (fbt_excluded(name))
  104                 return (0);
  105 
  106         instr = (uint32_t *)symval->value;
  107         limit = (uint32_t *)(symval->value + symval->size);
  108 
  109         /*
  110          * va_arg functions has first instruction of
  111          * sub sp, sp, #?
  112          */
  113         if ((*instr & 0xfffff000) == FBT_SUBSP)
  114                 instr++;
  115 
  116         /*
  117          * check if insn is a pushm with LR
  118          */
  119         if ((*instr & 0xffff0000) != FBT_PUSHM ||
  120             (*instr & (1 << LR)) == 0)
  121                 return (0);
  122 
  123         fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO);
  124         fbt->fbtp_name = name;
  125         fbt->fbtp_id = dtrace_probe_create(fbt_id, modname,
  126             name, FBT_ENTRY, 2, fbt);
  127         fbt->fbtp_patchpoint = instr;
  128         fbt->fbtp_ctl = lf;
  129         fbt->fbtp_loadcnt = lf->loadcnt;
  130         fbt->fbtp_savedval = *instr;
  131         fbt->fbtp_patchval = FBT_BREAKPOINT;
  132         fbt->fbtp_rval = DTRACE_INVOP_PUSHM;
  133         fbt->fbtp_symindx = symindx;
  134 
  135         fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)];
  136         fbt_probetab[FBT_ADDR2NDX(instr)] = fbt;
  137 
  138         lf->fbt_nentries++;
  139 
  140         popm = FBT_POPM | ((*instr) & 0x3FFF) | 0x8000;
  141 
  142         retfbt = NULL;
  143 again:
  144         for (; instr < limit; instr++) {
  145                 if (*instr == popm)
  146                         break;
  147                 else if ((*instr & 0xff000000) == FBT_JUMP) {
  148                         uint32_t *target, *start;
  149                         int offset;
  150 
  151                         offset = (*instr & 0xffffff);
  152                         offset <<= 8;
  153                         offset /= 64;
  154                         target = instr + (2 + offset);
  155                         start = (uint32_t *)symval->value;
  156                         if (target >= limit || target < start)
  157                                 break;
  158                 }
  159         }
  160 
  161         if (instr >= limit)
  162                 return (0);
  163 
  164         /*
  165          * We have a winner!
  166          */
  167         fbt = malloc(sizeof (fbt_probe_t), M_FBT, M_WAITOK | M_ZERO);
  168         fbt->fbtp_name = name;
  169         if (retfbt == NULL) {
  170                 fbt->fbtp_id = dtrace_probe_create(fbt_id, modname,
  171                     name, FBT_RETURN, 2, fbt);
  172         } else {
  173                 retfbt->fbtp_probenext = fbt;
  174                 fbt->fbtp_id = retfbt->fbtp_id;
  175         }
  176         retfbt = fbt;
  177 
  178         fbt->fbtp_patchpoint = instr;
  179         fbt->fbtp_ctl = lf;
  180         fbt->fbtp_loadcnt = lf->loadcnt;
  181         fbt->fbtp_symindx = symindx;
  182         if ((*instr & 0xff000000) == FBT_JUMP)
  183                 fbt->fbtp_rval = DTRACE_INVOP_B;
  184         else
  185                 fbt->fbtp_rval = DTRACE_INVOP_POPM;
  186         fbt->fbtp_roffset = (uintptr_t)instr - (uintptr_t)symval->value;
  187         fbt->fbtp_savedval = *instr;
  188         fbt->fbtp_patchval = FBT_BREAKPOINT;
  189         fbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)];
  190         fbt_probetab[FBT_ADDR2NDX(instr)] = fbt;
  191 
  192         lf->fbt_nentries++;
  193 
  194         instr++;
  195         goto again;
  196 }

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FreeBSD/Linux Kernel Cross Reference sys/cddl/dev/fbt/arm/fbt_isa.c

FreeBSD/Linux Kernel Cross Reference
sys/cddl/dev/fbt/arm/fbt_isa.c