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/8.1/sys/mips/mips/stack_machdep.c 178172 2008-04-13 07:27:37Z imp $");
   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 *)sp + 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)btext)
   63                         break;
   64                 for (i = pc; i >= (u_register_t)btext; i -= sizeof (insn)) {
   65                         bcopy((void *)i, &insn, sizeof insn);
   66                         switch (insn.IType.op) {
   67                         case OP_ADDI:
   68                         case OP_ADDIU:
   69                                 if (insn.IType.rs != SP || insn.IType.rt != SP)
   70                                         break;
   71                                 stacksize = -(short)insn.IType.imm;
   72                                 break;
   73 
   74                         case OP_SW:
   75                                 if (insn.IType.rs != SP || insn.IType.rt != RA)
   76                                         break;
   77                                 ra_stack_pos = (short)insn.IType.imm;
   78                                 break;
   79                         default:
   80                                 break;
   81                         }
   82 
   83                         if (stacksize)
   84                                 break;
   85                 }
   86 
   87                 if (stack_put(st, pc) == -1)
   88                         break;
   89 
   90                 for (i = pc; !ra; i += sizeof (insn)) {
   91                         bcopy((void *)i, &insn, sizeof insn);
   92 
   93                         switch (insn.IType.op) {
   94                         case OP_SPECIAL:
   95                                 if((insn.RType.func == OP_JR))
   96                                 {
   97                                         if (ra >= (u_register_t)btext)
   98                                                 break;
   99                                         if (insn.RType.rs != RA)
  100                                                 break;
  101                                         ra = stack_register_fetch(sp, 
  102                                             ra_stack_pos);
  103                                         if (!ra)
  104                                                 goto done;
  105                                         ra -= 8;
  106                                 }
  107                                 break;
  108                         default:
  109                                 break;
  110                         }
  111                         /* eret */
  112                         if (insn.word == 0x42000018)
  113                                 goto done;
  114                 }
  115 
  116                 if (pc == ra && stacksize == 0)
  117                         break;
  118 
  119                 sp += stacksize;
  120                 pc = ra;
  121                 ra = 0;
  122         }
  123 done:
  124         return;
  125 }
  126 
  127 void
  128 stack_save_td(struct stack *st, struct thread *td)
  129 {
  130         u_register_t pc, sp;
  131 
  132         if (TD_IS_SWAPPED(td))
  133                 panic("stack_save_td: swapped");
  134         if (TD_IS_RUNNING(td))
  135                 panic("stack_save_td: running");
  136 
  137         pc = td->td_pcb->pcb_regs.pc;
  138         sp = td->td_pcb->pcb_regs.sp;
  139         stack_capture(st, pc, sp);
  140 }
  141 
  142 void
  143 stack_save(struct stack *st)
  144 {
  145         u_register_t pc, sp;
  146 
  147         if (curthread == NULL)
  148                 panic("stack_save: curthread == NULL)");
  149 
  150         pc = curthread->td_pcb->pcb_regs.pc;
  151         sp = curthread->td_pcb->pcb_regs.sp;
  152         stack_capture(st, pc, sp);
  153 }

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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