summaryrefslogtreecommitdiff
path: root/disas/xtensa.c
blob: d7dda8c2d6a61333eed4b6a4e20fc2098f60225f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
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/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;
}