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