1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/types.h> 3 #include <string.h> 4 5 #include "debug.h" 6 #include "tests/tests.h" 7 #include "arch-tests.h" 8 #include "../../../../arch/x86/include/asm/insn.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 {"vmentry", INTEL_PT_OP_VMENTRY}, 52 {NULL, 0}, 53 }; 54 struct val_data *val; 55 56 if (!op_str || !strlen(op_str)) 57 return 0; 58 59 for (val = vals; val->name; val++) { 60 if (!strcmp(val->name, op_str)) 61 return val->val; 62 } 63 64 pr_debug("Failed to get op\n"); 65 66 return -1; 67 } 68 69 static int get_branch(const char *branch_str) 70 { 71 struct val_data { 72 const char *name; 73 int val; 74 } vals[] = { 75 {"no_branch", INTEL_PT_BR_NO_BRANCH}, 76 {"indirect", INTEL_PT_BR_INDIRECT}, 77 {"conditional", INTEL_PT_BR_CONDITIONAL}, 78 {"unconditional", INTEL_PT_BR_UNCONDITIONAL}, 79 {NULL, 0}, 80 }; 81 struct val_data *val; 82 83 if (!branch_str || !strlen(branch_str)) 84 return 0; 85 86 for (val = vals; val->name; val++) { 87 if (!strcmp(val->name, branch_str)) 88 return val->val; 89 } 90 91 pr_debug("Failed to get branch\n"); 92 93 return -1; 94 } 95 96 static int test_data_item(struct test_data *dat, int x86_64) 97 { 98 struct intel_pt_insn intel_pt_insn; 99 int op, branch, ret; 100 struct insn insn; 101 102 ret = insn_decode(&insn, dat->data, MAX_INSN_SIZE, 103 x86_64 ? INSN_MODE_64 : INSN_MODE_32); 104 if (ret < 0) { 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_suite *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 } 188