disas/xtensa.c

   1 /*
   2  * Copyright (c) 2017, Max Filippov, Open Source and Linux Lab.
   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 are met:
   7  *     * Redistributions of source code must retain the above copyright
   8  *       notice, this list of conditions and the following disclaimer.
   9  *     * Redistributions in binary form must reproduce the above copyright
  10  *       notice, this list of conditions and the following disclaimer in the
  11  *       documentation and/or other materials provided with the distribution.
  12  *     * Neither the name of the Open Source and Linux Lab nor the
  13  *       names of its contributors may be used to endorse or promote products
  14  *       derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "disas/dis-asm.h"
  30 #include "hw/xtensa/xtensa-isa.h"
  31
  32 int print_insn_xtensa(bfd_vma memaddr, struct disassemble_info *info)
  33 {
  34     xtensa_isa isa = info->private_data;
  35     xtensa_insnbuf insnbuf = xtensa_insnbuf_alloc(isa);
  36     xtensa_insnbuf slotbuf = xtensa_insnbuf_alloc(isa);
  37     bfd_byte *buffer = g_malloc(1);
  38     int status = info->read_memory_func(memaddr, buffer, 1, info);
  39     xtensa_format fmt;
  40     int slot, slots;
  41     unsigned len;
  42
  43     if (status) {
  44         info->memory_error_func(status, memaddr, info);
  45         len = -1;
  46         goto out;
  47     }
  48     len = xtensa_isa_length_from_chars(isa, buffer);
  49     if (len == XTENSA_UNDEFINED) {
  50         info->fprintf_func(info->stream, ".byte 0x%02x", buffer[0]);
  51         len = 1;
  52         goto out;
  53     }
  54     buffer = g_realloc(buffer, len);
  55     status = info->read_memory_func(memaddr + 1, buffer + 1, len - 1, info);
  56     if (status) {
  57         info->fprintf_func(info->stream, ".byte 0x%02x", buffer[0]);
  58         info->memory_error_func(status, memaddr + 1, info);
  59         len = 1;
  60         goto out;
  61     }
  62
  63     xtensa_insnbuf_from_chars(isa, insnbuf, buffer, len);
  64     fmt = xtensa_format_decode(isa, insnbuf);
  65     if (fmt == XTENSA_UNDEFINED) {
  66         unsigned i;
  67
  68         for (i = 0; i < len; ++i) {
  69             info->fprintf_func(info->stream, "%s 0x%02x",
  70                                i ? ", " : ".byte ", buffer[i]);
  71         }
  72         goto out;
  73     }
  74     slots = xtensa_format_num_slots(isa, fmt);
  75
  76     if (slots > 1) {
  77         info->fprintf_func(info->stream, "{ ");
  78     }
  79
  80     for (slot = 0; slot < slots; ++slot) {
  81         xtensa_opcode opc;
  82         int opnd, vopnd, opnds;
  83
  84         if (slot) {
  85             info->fprintf_func(info->stream, "; ");
  86         }
  87         xtensa_format_get_slot(isa, fmt, slot, insnbuf, slotbuf);
  88         opc = xtensa_opcode_decode(isa, fmt, slot, slotbuf);
  89         if (opc == XTENSA_UNDEFINED) {
  90             info->fprintf_func(info->stream, "???");
  91             continue;
  92         }
  93         opnds = xtensa_opcode_num_operands(isa, opc);
  94
  95         info->fprintf_func(info->stream, "%s", xtensa_opcode_name(isa, opc));
  96
  97         for (opnd = vopnd = 0; opnd < opnds; ++opnd) {
  98             if (xtensa_operand_is_visible(isa, opc, opnd)) {
  99                 uint32_t v = 0xbadc0de;
 100                 int rc;
 101
 102                 info->fprintf_func(info->stream, vopnd ? ", " : "\t");
 103                 xtensa_operand_get_field(isa, opc, opnd, fmt, slot,
 104                                          slotbuf, &v);
 105                 rc = xtensa_operand_decode(isa, opc, opnd, &v);
 106                 if (rc == XTENSA_UNDEFINED) {
 107                     info->fprintf_func(info->stream, "???");
 108                 } else if (xtensa_operand_is_register(isa, opc, opnd)) {
 109                     xtensa_regfile rf = xtensa_operand_regfile(isa, opc, opnd);
 110
 111                     info->fprintf_func(info->stream, "%s%d",
 112                                        xtensa_regfile_shortname(isa, rf), v);
 113                 } else if (xtensa_operand_is_PCrelative(isa, opc, opnd)) {
 114                     xtensa_operand_undo_reloc(isa, opc, opnd, &v, memaddr);
 115                     info->fprintf_func(info->stream, "0x%x", v);
 116                 } else {
 117                     info->fprintf_func(info->stream, "%d", v);
 118                 }
 119                 ++vopnd;
 120             }
 121         }
 122     }
 123     if (slots > 1) {
 124         info->fprintf_func(info->stream, " }");
 125     }
 126
 127 out:
 128     g_free(buffer);
 129     xtensa_insnbuf_free(isa, insnbuf);
 130     xtensa_insnbuf_free(isa, slotbuf);
 131
 132     return len;
 133 }