qemu

xtensa.c (5162B)

---

 /*
  * Copyright (c) 2017, Max Filippov, Open Source and Linux Lab.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *     * Redistributions of source code must retain the above copyright
  *       notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above copyright
  *       notice, this list of conditions and the following disclaimer in the
  *       documentation and/or other materials provided with the distribution.
  *     * Neither the name of the Open Source and Linux Lab nor the
  *       names of its contributors may be used to endorse or promote products
  *       derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "qemu/osdep.h"
 #include "disas/dis-asm.h"
 #include "hw/xtensa/xtensa-isa.h"
 
 int print_insn_xtensa(bfd_vma memaddr, struct disassemble_info *info)
 {
     xtensa_isa isa = info->private_data;
     xtensa_insnbuf insnbuf = xtensa_insnbuf_alloc(isa);
     xtensa_insnbuf slotbuf = xtensa_insnbuf_alloc(isa);
     bfd_byte *buffer = g_malloc(1);
     int status = info->read_memory_func(memaddr, buffer, 1, info);
     xtensa_format fmt;
     int slot, slots;
     unsigned len;
 
     if (status) {
         info->memory_error_func(status, memaddr, info);
         len = -1;
         goto out;
     }
     len = xtensa_isa_length_from_chars(isa, buffer);
     if (len == XTENSA_UNDEFINED) {
         info->fprintf_func(info->stream, ".byte 0x%02x", buffer[0]);
         len = 1;
         goto out;
     }
     buffer = g_realloc(buffer, len);
     status = info->read_memory_func(memaddr + 1, buffer + 1, len - 1, info);
     if (status) {
         info->fprintf_func(info->stream, ".byte 0x%02x", buffer[0]);
         info->memory_error_func(status, memaddr + 1, info);
         len = 1;
         goto out;
     }
 
     xtensa_insnbuf_from_chars(isa, insnbuf, buffer, len);
     fmt = xtensa_format_decode(isa, insnbuf);
     if (fmt == XTENSA_UNDEFINED) {
         unsigned i;
 
         for (i = 0; i < len; ++i) {
             info->fprintf_func(info->stream, "%s 0x%02x",
                                i ? ", " : ".byte ", buffer[i]);
         }
         goto out;
     }
     slots = xtensa_format_num_slots(isa, fmt);
 
     if (slots > 1) {
         info->fprintf_func(info->stream, "{ ");
     }
 
     for (slot = 0; slot < slots; ++slot) {
         xtensa_opcode opc;
         int opnd, vopnd, opnds;
 
         if (slot) {
             info->fprintf_func(info->stream, "; ");
         }
         xtensa_format_get_slot(isa, fmt, slot, insnbuf, slotbuf);
         opc = xtensa_opcode_decode(isa, fmt, slot, slotbuf);
         if (opc == XTENSA_UNDEFINED) {
             info->fprintf_func(info->stream, "???");
             continue;
         }
         opnds = xtensa_opcode_num_operands(isa, opc);
 
         info->fprintf_func(info->stream, "%s", xtensa_opcode_name(isa, opc));
 
         for (opnd = vopnd = 0; opnd < opnds; ++opnd) {
             if (xtensa_operand_is_visible(isa, opc, opnd)) {
                 uint32_t v = 0xbadc0de;
                 int rc;
 
                 info->fprintf_func(info->stream, vopnd ? ", " : "\t");
                 xtensa_operand_get_field(isa, opc, opnd, fmt, slot,
                                          slotbuf, &v);
                 rc = xtensa_operand_decode(isa, opc, opnd, &v);
                 if (rc == XTENSA_UNDEFINED) {
                     info->fprintf_func(info->stream, "???");
                 } else if (xtensa_operand_is_register(isa, opc, opnd)) {
                     xtensa_regfile rf = xtensa_operand_regfile(isa, opc, opnd);
 
                     info->fprintf_func(info->stream, "%s%d",
                                        xtensa_regfile_shortname(isa, rf), v);
                 } else if (xtensa_operand_is_PCrelative(isa, opc, opnd)) {
                     xtensa_operand_undo_reloc(isa, opc, opnd, &v, memaddr);
                     info->fprintf_func(info->stream, "0x%x", v);
                 } else {
                     info->fprintf_func(info->stream, "%d", v);
                 }
                 ++vopnd;
             }
         }
     }
     if (slots > 1) {
         info->fprintf_func(info->stream, " }");
     }
 
 out:
     g_free(buffer);
     xtensa_insnbuf_free(isa, insnbuf);
     xtensa_insnbuf_free(isa, slotbuf);
 
     return len;
 }