1/*
2 * Copyright © 2014 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24#include <stdlib.h>
25
26#include "compiler/brw_inst.h"
27#include "compiler/brw_eu.h"
28
29#include "gen_disasm.h"
30
31struct gen_disasm {
32    struct gen_device_info devinfo;
33};
34
35static bool
36is_send(uint32_t opcode)
37{
38   return (opcode == BRW_OPCODE_SEND  ||
39           opcode == BRW_OPCODE_SENDC ||
40           opcode == BRW_OPCODE_SENDS ||
41           opcode == BRW_OPCODE_SENDSC );
42}
43
44static int
45gen_disasm_find_end(struct gen_disasm *disasm,
46                    const void *assembly, int start)
47{
48   struct gen_device_info *devinfo = &disasm->devinfo;
49   int offset = start;
50
51   /* This loop exits when send-with-EOT or when opcode is 0 */
52   while (true) {
53      const brw_inst *insn = assembly + offset;
54
55      if (brw_inst_cmpt_control(devinfo, insn)) {
56         offset += 8;
57      } else {
58         offset += 16;
59      }
60
61      /* Simplistic, but efficient way to terminate disasm */
62      uint32_t opcode = brw_inst_opcode(devinfo, insn);
63      if (opcode == 0 || (is_send(opcode) && brw_inst_eot(devinfo, insn))) {
64         break;
65      }
66   }
67
68   return offset;
69}
70
71void
72gen_disasm_disassemble(struct gen_disasm *disasm, const void *assembly,
73                       int start, FILE *out)
74{
75   struct gen_device_info *devinfo = &disasm->devinfo;
76   int end = gen_disasm_find_end(disasm, assembly, start);
77
78   /* Make a dummy disasm structure that brw_validate_instructions
79    * can work from.
80    */
81   struct disasm_info *disasm_info = disasm_initialize(devinfo, NULL);
82   disasm_new_inst_group(disasm_info, start);
83   disasm_new_inst_group(disasm_info, end);
84
85   brw_validate_instructions(devinfo, assembly, start, end, disasm_info);
86
87   foreach_list_typed(struct inst_group, group, link,
88                      &disasm_info->group_list) {
89      struct exec_node *next_node = exec_node_get_next(&group->link);
90      if (exec_node_is_tail_sentinel(next_node))
91         break;
92
93      struct inst_group *next =
94         exec_node_data(struct inst_group, next_node, link);
95
96      int start_offset = group->offset;
97      int end_offset = next->offset;
98
99      brw_disassemble(devinfo, assembly, start_offset, end_offset, out);
100
101      if (group->error) {
102         fputs(group->error, out);
103      }
104   }
105
106   ralloc_free(disasm_info);
107}
108
109struct gen_disasm *
110gen_disasm_create(const struct gen_device_info *devinfo)
111{
112   struct gen_disasm *gd;
113
114   gd = malloc(sizeof *gd);
115   if (gd == NULL)
116      return NULL;
117
118   gd->devinfo = *devinfo;
119
120   brw_init_compaction_tables(&gd->devinfo);
121
122   return gd;
123}
124
125void
126gen_disasm_destroy(struct gen_disasm *disasm)
127{
128   free(disasm);
129}
130