src/intel/common/gen_disasm.c

   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
  31 uint64_t INTEL_DEBUG;
  32
  33 struct gen_disasm {
  34     struct gen_device_info devinfo;
  35 };
  36
  37 static bool
  38 is_send(uint32_t opcode)
  39 {
  40    return (opcode == BRW_OPCODE_SEND  ||
  41            opcode == BRW_OPCODE_SENDC ||
  42            opcode == BRW_OPCODE_SENDS ||
  43            opcode == BRW_OPCODE_SENDSC );
  44 }
  45
  46 static int
  47 gen_disasm_find_end(struct gen_disasm *disasm,
  48                     const void *assembly, int start)
  49 {
  50    struct gen_device_info *devinfo = &disasm->devinfo;
  51    int offset = start;
  52
  53    /* This loop exits when send-with-EOT or when opcode is 0 */
  54    while (true) {
  55       const brw_inst *insn = assembly + offset;
  56
  57       if (brw_inst_cmpt_control(devinfo, insn)) {
  58          offset += 8;
  59       } else {
  60          offset += 16;
  61       }
  62
  63       /* Simplistic, but efficient way to terminate disasm */
  64       uint32_t opcode = brw_inst_opcode(devinfo, insn);
  65       if (opcode == 0 || (is_send(opcode) && brw_inst_eot(devinfo, insn))) {
  66          break;
  67       }
  68    }
  69
  70    return offset;
  71 }
  72
  73 void
  74 gen_disasm_disassemble(struct gen_disasm *disasm, const void *assembly,
  75                        int start, FILE *out)
  76 {
  77    struct gen_device_info *devinfo = &disasm->devinfo;
  78    int end = gen_disasm_find_end(disasm, assembly, start);
  79
  80    /* Make a dummy disasm structure that brw_validate_instructions
  81     * can work from.
  82     */
  83    struct disasm_info *disasm_info = disasm_initialize(devinfo, NULL);
  84    disasm_new_inst_group(disasm_info, start);
  85    disasm_new_inst_group(disasm_info, end);
  86
  87    brw_validate_instructions(devinfo, assembly, start, end, disasm_info);
  88
  89    foreach_list_typed(struct inst_group, group, link,
  90                       &disasm_info->group_list) {
  91       struct exec_node *next_node = exec_node_get_next(&group->link);
  92       if (exec_node_is_tail_sentinel(next_node))
  93          break;
  94
  95       struct inst_group *next =
  96          exec_node_data(struct inst_group, next_node, link);
  97
  98       int start_offset = group->offset;
  99       int end_offset = next->offset;
 100
 101       brw_disassemble(devinfo, assembly, start_offset, end_offset, out);
 102
 103       if (group->error) {
 104          fputs(group->error, out);
 105       }
 106    }
 107
 108    ralloc_free(disasm_info);
 109 }
 110
 111 struct gen_disasm *
 112 gen_disasm_create(const struct gen_device_info *devinfo)
 113 {
 114    struct gen_disasm *gd;
 115
 116    gd = malloc(sizeof *gd);
 117    if (gd == NULL)
 118       return NULL;
 119
 120    gd->devinfo = *devinfo;
 121
 122    brw_init_compaction_tables(&gd->devinfo);
 123
 124    return gd;
 125 }
 126
 127 void
 128 gen_disasm_destroy(struct gen_disasm *disasm)
 129 {
 130    free(disasm);
 131 }