The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/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/8.4/sys/mips/mips/stack_machdep.c 215938 2010-11-27 12:26:40Z jchandra $");
   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/param.h>
   39 #include <machine/pcb.h>
   40 #include <machine/regnum.h>
   41 
   42 static u_register_t
   43 stack_register_fetch(u_register_t sp, u_register_t stack_pos)
   44 {
   45         u_register_t * stack = 
   46             ((u_register_t *)(intptr_t)sp + (size_t)stack_pos/sizeof(u_register_t));
   47 
   48         return *stack;
   49 }
   50 
   51 static void
   52 stack_capture(struct stack *st, u_register_t pc, u_register_t sp)
   53 {
   54         u_register_t  ra = 0, i, stacksize;
   55         short ra_stack_pos = 0;
   56         InstFmt insn;
   57 
   58         stack_zero(st);
   59 
   60         for (;;) {
   61                 stacksize = 0;
   62                 if (pc <= (u_register_t)(intptr_t)btext)
   63                         break;
   64                 for (i = pc; i >= (u_register_t)(intptr_t)btext; i -= sizeof (insn)) {
   65                         bcopy((void *)(intptr_t)i, &insn, sizeof insn);
   66                         switch (insn.IType.op) {
   67                         case OP_ADDI:
   68                         case OP_ADDIU:
   69                         case OP_DADDI:
   70                         case OP_DADDIU:
   71                                 if (insn.IType.rs != SP || insn.IType.rt != SP)
   72                                         break;
   73                                 stacksize = -(short)insn.IType.imm;
   74                                 break;
   75 
   76                         case OP_SW:
   77                         case OP_SD:
   78                                 if (insn.IType.rs != SP || insn.IType.rt != RA)
   79                                         break;
   80                                 ra_stack_pos = (short)insn.IType.imm;
   81                                 break;
   82                         default:
   83                                 break;
   84                         }
   85 
   86                         if (stacksize)
   87                                 break;
   88                 }
   89 
   90                 if (stack_put(st, pc) == -1)
   91                         break;
   92 
   93                 for (i = pc; !ra; i += sizeof (insn)) {
   94                         bcopy((void *)(intptr_t)i, &insn, sizeof insn);
   95 
   96                         switch (insn.IType.op) {
   97                         case OP_SPECIAL:
   98                                 if((insn.RType.func == OP_JR))
   99                                 {
  100                                         if (ra >= (u_register_t)(intptr_t)btext)
  101                                                 break;
  102                                         if (insn.RType.rs != RA)
  103                                                 break;
  104                                         ra = stack_register_fetch(sp, 
  105                                             ra_stack_pos);
  106                                         if (!ra)
  107                                                 goto done;
  108                                         ra -= 8;
  109                                 }
  110                                 break;
  111                         default:
  112                                 break;
  113                         }
  114                         /* eret */
  115                         if (insn.word == 0x42000018)
  116                                 goto done;
  117                 }
  118 
  119                 if (pc == ra && stacksize == 0)
  120                         break;
  121 
  122                 sp += stacksize;
  123                 pc = ra;
  124                 ra = 0;
  125         }
  126 done:
  127         return;
  128 }
  129 
  130 void
  131 stack_save_td(struct stack *st, struct thread *td)
  132 {
  133         u_register_t pc, sp;
  134 
  135         if (TD_IS_SWAPPED(td))
  136                 panic("stack_save_td: swapped");
  137         if (TD_IS_RUNNING(td))
  138                 panic("stack_save_td: running");
  139 
  140         pc = td->td_pcb->pcb_regs.pc;
  141         sp = td->td_pcb->pcb_regs.sp;
  142         stack_capture(st, pc, sp);
  143 }
  144 
  145 void
  146 stack_save(struct stack *st)
  147 {
  148         u_register_t pc, sp;
  149 
  150         if (curthread == NULL)
  151                 panic("stack_save: curthread == NULL)");
  152 
  153         pc = curthread->td_pcb->pcb_regs.pc;
  154         sp = curthread->td_pcb->pcb_regs.sp;
  155         stack_capture(st, pc, sp);
  156 }

Cache object: 63888c38e581516c7fd3fa1a4601cd49


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