stack_machdep.c

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    1 /*-
    2  * Copyright (c) 2005 Antoine Brodin
    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 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.1/sys/mips/mips/stack_machdep.c 295881 2016-02-22 09:04:36Z skra $");
   29 
   30 #include <sys/types.h>
   31 #include <sys/systm.h>
   32 #include <sys/param.h>
   33 #include <sys/proc.h>
   34 #include <sys/stack.h>
   35 
   36 #include <machine/mips_opcode.h>
   37 
   38 #include <machine/pcb.h>
   39 #include <machine/regnum.h>
   40 
   41 static u_register_t
   42 stack_register_fetch(u_register_t sp, u_register_t stack_pos)
   43 {
   44         u_register_t * stack = 
   45             ((u_register_t *)(intptr_t)sp + (size_t)stack_pos/sizeof(u_register_t));
   46 
   47         return *stack;
   48 }
   49 
   50 static void
   51 stack_capture(struct stack *st, u_register_t pc, u_register_t sp)
   52 {
   53         u_register_t  ra = 0, i, stacksize;
   54         short ra_stack_pos = 0;
   55         InstFmt insn;
   56 
   57         stack_zero(st);
   58 
   59         for (;;) {
   60                 stacksize = 0;
   61                 if (pc <= (u_register_t)(intptr_t)btext)
   62                         break;
   63                 for (i = pc; i >= (u_register_t)(intptr_t)btext; i -= sizeof (insn)) {
   64                         bcopy((void *)(intptr_t)i, &insn, sizeof insn);
   65                         switch (insn.IType.op) {
   66                         case OP_ADDI:
   67                         case OP_ADDIU:
   68                         case OP_DADDI:
   69                         case OP_DADDIU:
   70                                 if (insn.IType.rs != SP || insn.IType.rt != SP)
   71                                         break;
   72                                 stacksize = -(short)insn.IType.imm;
   73                                 break;
   74 
   75                         case OP_SW:
   76                         case OP_SD:
   77                                 if (insn.IType.rs != SP || insn.IType.rt != RA)
   78                                         break;
   79                                 ra_stack_pos = (short)insn.IType.imm;
   80                                 break;
   81                         default:
   82                                 break;
   83                         }
   84 
   85                         if (stacksize)
   86                                 break;
   87                 }
   88 
   89                 if (stack_put(st, pc) == -1)
   90                         break;
   91 
   92                 for (i = pc; !ra; i += sizeof (insn)) {
   93                         bcopy((void *)(intptr_t)i, &insn, sizeof insn);
   94 
   95                         switch (insn.IType.op) {
   96                         case OP_SPECIAL:
   97                                 if((insn.RType.func == OP_JR))
   98                                 {
   99                                         if (ra >= (u_register_t)(intptr_t)btext)
  100                                                 break;
  101                                         if (insn.RType.rs != RA)
  102                                                 break;
  103                                         ra = stack_register_fetch(sp, 
  104                                             ra_stack_pos);
  105                                         if (!ra)
  106                                                 goto done;
  107                                         ra -= 8;
  108                                 }
  109                                 break;
  110                         default:
  111                                 break;
  112                         }
  113                         /* eret */
  114                         if (insn.word == 0x42000018)
  115                                 goto done;
  116                 }
  117 
  118                 if (pc == ra && stacksize == 0)
  119                         break;
  120 
  121                 sp += stacksize;
  122                 pc = ra;
  123                 ra = 0;
  124         }
  125 done:
  126         return;
  127 }
  128 
  129 void
  130 stack_save_td(struct stack *st, struct thread *td)
  131 {
  132         u_register_t pc, sp;
  133 
  134         if (TD_IS_SWAPPED(td))
  135                 panic("stack_save_td: swapped");
  136         if (TD_IS_RUNNING(td))
  137                 panic("stack_save_td: running");
  138 
  139         pc = td->td_pcb->pcb_regs.pc;
  140         sp = td->td_pcb->pcb_regs.sp;
  141         stack_capture(st, pc, sp);
  142 }
  143 
  144 int
  145 stack_save_td_running(struct stack *st, struct thread *td)
  146 {
  147 
  148         return (EOPNOTSUPP);
  149 }
  150 
  151 void
  152 stack_save(struct stack *st)
  153 {
  154         u_register_t pc, sp;
  155 
  156         if (curthread == NULL)
  157                 panic("stack_save: curthread == NULL");
  158 
  159         pc = curthread->td_pcb->pcb_regs.pc;
  160         sp = curthread->td_pcb->pcb_regs.sp;
  161         stack_capture(st, pc, sp);
  162 }

Cache object: 92fb83a2447c91d244c73c8df6dd5200

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FreeBSD/Linux Kernel Cross Reference sys/mips/mips/stack_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/stack_machdep.c