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