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