root/tools/perf/arch/x86/tests/insn-x86.c

DEFINITIONS

1. get_op
2. get_branch
3. test_data_item
4. test_data_set
5. test__insn_x86

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/types.h>
   3 #include "../../../../arch/x86/include/asm/insn.h"
   4 #include <string.h>
   5 
   6 #include "debug.h"
   7 #include "tests/tests.h"
   8 #include "arch-tests.h"
   9 
  10 #include "intel-pt-decoder/intel-pt-insn-decoder.h"
  11 
  12 struct test_data {
  13         u8 data[MAX_INSN_SIZE];
  14         int expected_length;
  15         int expected_rel;
  16         const char *expected_op_str;
  17         const char *expected_branch_str;
  18         const char *asm_rep;
  19 };
  20 
  21 struct test_data test_data_32[] = {
  22 #include "insn-x86-dat-32.c"
  23         {{0x0f, 0x01, 0xee}, 3, 0, NULL, NULL, "0f 01 ee             \trdpkru"},
  24         {{0x0f, 0x01, 0xef}, 3, 0, NULL, NULL, "0f 01 ef             \twrpkru"},
  25         {{0}, 0, 0, NULL, NULL, NULL},
  26 };
  27 
  28 struct test_data test_data_64[] = {
  29 #include "insn-x86-dat-64.c"
  30         {{0x0f, 0x01, 0xee}, 3, 0, NULL, NULL, "0f 01 ee             \trdpkru"},
  31         {{0x0f, 0x01, 0xef}, 3, 0, NULL, NULL, "0f 01 ef             \twrpkru"},
  32         {{0}, 0, 0, NULL, NULL, NULL},
  33 };
  34 
  35 static int get_op(const char *op_str)
  36 {
  37         struct val_data {
  38                 const char *name;
  39                 int val;
  40         } vals[] = {
  41                 {"other",   INTEL_PT_OP_OTHER},
  42                 {"call",    INTEL_PT_OP_CALL},
  43                 {"ret",     INTEL_PT_OP_RET},
  44                 {"jcc",     INTEL_PT_OP_JCC},
  45                 {"jmp",     INTEL_PT_OP_JMP},
  46                 {"loop",    INTEL_PT_OP_LOOP},
  47                 {"iret",    INTEL_PT_OP_IRET},
  48                 {"int",     INTEL_PT_OP_INT},
  49                 {"syscall", INTEL_PT_OP_SYSCALL},
  50                 {"sysret",  INTEL_PT_OP_SYSRET},
  51                 {NULL, 0},
  52         };
  53         struct val_data *val;
  54 
  55         if (!op_str || !strlen(op_str))
  56                 return 0;
  57 
  58         for (val = vals; val->name; val++) {
  59                 if (!strcmp(val->name, op_str))
  60                         return val->val;
  61         }
  62 
  63         pr_debug("Failed to get op\n");
  64 
  65         return -1;
  66 }
  67 
  68 static int get_branch(const char *branch_str)
  69 {
  70         struct val_data {
  71                 const char *name;
  72                 int val;
  73         } vals[] = {
  74                 {"no_branch",     INTEL_PT_BR_NO_BRANCH},
  75                 {"indirect",      INTEL_PT_BR_INDIRECT},
  76                 {"conditional",   INTEL_PT_BR_CONDITIONAL},
  77                 {"unconditional", INTEL_PT_BR_UNCONDITIONAL},
  78                 {NULL, 0},
  79         };
  80         struct val_data *val;
  81 
  82         if (!branch_str || !strlen(branch_str))
  83                 return 0;
  84 
  85         for (val = vals; val->name; val++) {
  86                 if (!strcmp(val->name, branch_str))
  87                         return val->val;
  88         }
  89 
  90         pr_debug("Failed to get branch\n");
  91 
  92         return -1;
  93 }
  94 
  95 static int test_data_item(struct test_data *dat, int x86_64)
  96 {
  97         struct intel_pt_insn intel_pt_insn;
  98         struct insn insn;
  99         int op, branch;
 100 
 101         insn_init(&insn, dat->data, MAX_INSN_SIZE, x86_64);
 102         insn_get_length(&insn);
 103 
 104         if (!insn_complete(&insn)) {
 105                 pr_debug("Failed to decode: %s\n", dat->asm_rep);
 106                 return -1;
 107         }
 108 
 109         if (insn.length != dat->expected_length) {
 110                 pr_debug("Failed to decode length (%d vs expected %d): %s\n",
 111                          insn.length, dat->expected_length, dat->asm_rep);
 112                 return -1;
 113         }
 114 
 115         op = get_op(dat->expected_op_str);
 116         branch = get_branch(dat->expected_branch_str);
 117 
 118         if (intel_pt_get_insn(dat->data, MAX_INSN_SIZE, x86_64, &intel_pt_insn)) {
 119                 pr_debug("Intel PT failed to decode: %s\n", dat->asm_rep);
 120                 return -1;
 121         }
 122 
 123         if ((int)intel_pt_insn.op != op) {
 124                 pr_debug("Failed to decode 'op' value (%d vs expected %d): %s\n",
 125                          intel_pt_insn.op, op, dat->asm_rep);
 126                 return -1;
 127         }
 128 
 129         if ((int)intel_pt_insn.branch != branch) {
 130                 pr_debug("Failed to decode 'branch' value (%d vs expected %d): %s\n",
 131                          intel_pt_insn.branch, branch, dat->asm_rep);
 132                 return -1;
 133         }
 134 
 135         if (intel_pt_insn.rel != dat->expected_rel) {
 136                 pr_debug("Failed to decode 'rel' value (%#x vs expected %#x): %s\n",
 137                          intel_pt_insn.rel, dat->expected_rel, dat->asm_rep);
 138                 return -1;
 139         }
 140 
 141         pr_debug("Decoded ok: %s\n", dat->asm_rep);
 142 
 143         return 0;
 144 }
 145 
 146 static int test_data_set(struct test_data *dat_set, int x86_64)
 147 {
 148         struct test_data *dat;
 149         int ret = 0;
 150 
 151         for (dat = dat_set; dat->expected_length; dat++) {
 152                 if (test_data_item(dat, x86_64))
 153                         ret = -1;
 154         }
 155 
 156         return ret;
 157 }
 158 
 159 /**
 160  * test__insn_x86 - test x86 instruction decoder - new instructions.
 161  *
 162  * This function implements a test that decodes a selection of instructions and
 163  * checks the results.  The Intel PT function that further categorizes
 164  * instructions (i.e. intel_pt_get_insn()) is also checked.
 165  *
 166  * The instructions are originally in insn-x86-dat-src.c which has been
 167  * processed by scripts gen-insn-x86-dat.sh and gen-insn-x86-dat.awk to produce
 168  * insn-x86-dat-32.c and insn-x86-dat-64.c which are included into this program.
 169  * i.e. to add new instructions to the test, edit insn-x86-dat-src.c, run the
 170  * gen-insn-x86-dat.sh script, make perf, and then run the test.
 171  *
 172  * If the test passes %0 is returned, otherwise %-1 is returned.  Use the
 173  * verbose (-v) option to see all the instructions and whether or not they
 174  * decoded successfully.
 175  */
 176 int test__insn_x86(struct test *test __maybe_unused, int subtest __maybe_unused)
 177 {
 178         int ret = 0;
 179 
 180         if (test_data_set(test_data_32, 0))
 181                 ret = -1;
 182 
 183         if (test_data_set(test_data_64, 1))
 184                 ret = -1;
 185 
 186         return ret;
 187 }