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authorMax Filippov <jcmvbkbc@gmail.com>2017-10-31 16:17:43 -0700
committerMax Filippov <jcmvbkbc@gmail.com>2018-01-09 09:55:39 -0800
commit5a6539e627faf9251e1db78238b9f9b870610518 (patch)
treecf1d5f6c9ff660be906c294b9f44596c4b6c2320 /disas
parentc5ac936e5e8356cf6bba8e39519a273ab0fc6fed (diff)
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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>
Diffstat (limited to 'disas')
-rw-r--r--disas/Makefile.objs1
-rw-r--r--disas/xtensa.c133
2 files changed, 134 insertions, 0 deletions
diff --git a/disas/Makefile.objs b/disas/Makefile.objs
index 194648f..53556f8 100644
--- a/disas/Makefile.objs
+++ b/disas/Makefile.objs
@@ -21,6 +21,7 @@ common-obj-$(CONFIG_S390_DIS) += s390.o
common-obj-$(CONFIG_SH4_DIS) += sh4.o
common-obj-$(CONFIG_SPARC_DIS) += sparc.o
common-obj-$(CONFIG_LM32_DIS) += lm32.o
+common-obj-$(CONFIG_XTENSA_DIS) += xtensa.o
# TODO: As long as the TCG interpreter and its generated code depend
# on the QEMU target, we cannot compile the disassembler here.
diff --git a/disas/xtensa.c b/disas/xtensa.c
new file mode 100644
index 0000000..114326a
--- /dev/null
+++ b/disas/xtensa.c
@@ -0,0 +1,133 @@
+/*
+ * 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/bfd.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;
+ unsigned 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;
+ unsigned 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;
+}