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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 struct gen_disasm {
     32     struct gen_device_info devinfo;
     33 };
     34 
     35 static bool
     36 is_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 
     44 static int
     45 gen_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 
     71 void
     72 gen_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 
    109 struct gen_disasm *
    110 gen_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 
    125 void
    126 gen_disasm_destroy(struct gen_disasm *disasm)
    127 {
    128    free(disasm);
    129 }
    130