LXR qemu/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
  32int 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
 127out:
 128    g_free(buffer);
 129    xtensa_insnbuf_free(isa, insnbuf);
 130    xtensa_insnbuf_free(isa, slotbuf);
 131
 132    return len;
 133}
 134