release/src-rt-6.x.4708/cfe/cfe/arch/arm/common/src/disasm.c

   1 /*  *********************************************************************
   2     *  Broadcom Common Firmware Environment (CFE)
   3     *
   4     *  MIPS disassembler                        File: disasm.c
   5     *
   6     *  ARM disassembler (used by ui_examcmds.c)
   7     *
   8     *  Author:
   9     *
  10     *********************************************************************
  11     *
  12     *  Copyright 2000,2001,2002,2003
  13     *  Broadcom Corporation. All rights reserved.
  14     *
  15     *  This software is furnished under license and may be used and
  16     *  copied only in accordance with the following terms and
  17     *  conditions.  Subject to these conditions, you may download,
  18     *  copy, install, use, modify and distribute modified or unmodified
  19     *  copies of this software in source and/or binary form.  No title
  20     *  or ownership is transferred hereby.
  21     *
  22     *  1) Any source code used, modified or distributed must reproduce
  23     *     and retain this copyright notice and list of conditions
  24     *     as they appear in the source file.
  25     *
  26     *  2) No right is granted to use any trade name, trademark, or
  27     *     logo of Broadcom Corporation.  The "Broadcom Corporation"
  28     *     name may not be used to endorse or promote products derived
  29     *     from this software without the prior written permission of
  30     *     Broadcom Corporation.
  31     *
  32     *  3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR
  33     *     IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED
  34     *     WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  35     *     PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT
  36     *     SHALL BROADCOM BE LIABLE FOR ANY DAMAGES WHATSOEVER, AND IN
  37     *     PARTICULAR, BROADCOM SHALL NOT BE LIABLE FOR DIRECT, INDIRECT,
  38     *     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  39     *     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  40     *     GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  41     *     BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  42     *     OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  43     *     TORT (INCLUDING NEGLIGENCE OR OTHERWISE), EVEN IF ADVISED OF
  44     *     THE POSSIBILITY OF SUCH DAMAGE.
  45     ********************************************************************* */
  46
  47
  48 #include "lib_types.h"
  49 #include "lib_string.h"
  50 #include "disasm.h"
  51 #include "lib_printf.h"
  52
  53
  54
  55
  56 /* We're pulling some trickery here.  Most of the time, this structure operates
  57    exactly as one would expect.  The special case, when type == DC_DREF,
  58    means name points to a byte that is an index into a dereferencing array.  */
  59
  60 /*
  61  * To make matters worse, the whole module has been coded to reduce the
  62  * number of relocations present, so we don't actually store pointers
  63  * in the dereferencing array.  Instead, we store fixed-width strings
  64  * and use digits to represent indicies into the deref array.
  65  *
  66  * This is all to make more things fit in the relocatable version,
  67  * since every initialized pointer goes into our small data segment.
  68  */
  69
  70 typedef struct {
  71     char name[15];
  72     char type;
  73 } disasm_t;
  74
  75 typedef struct {
  76         const disasm_t *ptr;
  77         int shift;
  78         uint32_t mask;
  79 } disasm_deref_t;
  80
  81 /* Forward declaration of deref array, we need this for the disasm_t definitions */
  82
  83
  84
  85 static const disasm_t *get_disasm_field(uint32_t inst)
  86 {
  87         return NULL;
  88 }
  89
  90 char *disasm_inst_name(uint32_t inst)
  91 {
  92         return (char *)(get_disasm_field(inst)->name);
  93 }
  94
  95 void disasm_inst(char *buf, int buf_size, uint32_t inst, uint64_t pc)
  96 {
  97         buf[buf_size-1] = 0;
  98
  99 }