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target/xtensa: implement disassembler
Add disas/xtensa.c and use libisa for instruction decoding/opcode name lookup. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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/* | ||
* 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. | ||
*/ | ||
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#include "qemu/osdep.h" | ||
#include "disas/bfd.h" | ||
#include "hw/xtensa/xtensa-isa.h" | ||
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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; | ||
unsigned slot, slots; | ||
unsigned len; | ||
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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; | ||
} | ||
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xtensa_insnbuf_from_chars(isa, insnbuf, buffer, len); | ||
fmt = xtensa_format_decode(isa, insnbuf); | ||
if (fmt == XTENSA_UNDEFINED) { | ||
unsigned i; | ||
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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); | ||
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if (slots > 1) { | ||
info->fprintf_func(info->stream, "{ "); | ||
} | ||
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for (slot = 0; slot < slots; ++slot) { | ||
xtensa_opcode opc; | ||
unsigned opnd, vopnd, opnds; | ||
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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); | ||
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info->fprintf_func(info->stream, "%s", xtensa_opcode_name(isa, opc)); | ||
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for (opnd = vopnd = 0; opnd < opnds; ++opnd) { | ||
if (xtensa_operand_is_visible(isa, opc, opnd)) { | ||
uint32_t v = 0xbadc0de; | ||
int rc; | ||
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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); | ||
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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, " }"); | ||
} | ||
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out: | ||
g_free(buffer); | ||
xtensa_insnbuf_free(isa, insnbuf); | ||
xtensa_insnbuf_free(isa, slotbuf); | ||
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return len; | ||
} |
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