1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <string.h> 4 #include <regex.h> 5 #include <linux/zalloc.h> 6 7 #include "../../util/perf_regs.h" 8 #include "../../util/debug.h" 9 10 #include <linux/kernel.h> 11 12 const struct sample_reg sample_reg_masks[] = { 13 SMPL_REG(r0, PERF_REG_POWERPC_R0), 14 SMPL_REG(r1, PERF_REG_POWERPC_R1), 15 SMPL_REG(r2, PERF_REG_POWERPC_R2), 16 SMPL_REG(r3, PERF_REG_POWERPC_R3), 17 SMPL_REG(r4, PERF_REG_POWERPC_R4), 18 SMPL_REG(r5, PERF_REG_POWERPC_R5), 19 SMPL_REG(r6, PERF_REG_POWERPC_R6), 20 SMPL_REG(r7, PERF_REG_POWERPC_R7), 21 SMPL_REG(r8, PERF_REG_POWERPC_R8), 22 SMPL_REG(r9, PERF_REG_POWERPC_R9), 23 SMPL_REG(r10, PERF_REG_POWERPC_R10), 24 SMPL_REG(r11, PERF_REG_POWERPC_R11), 25 SMPL_REG(r12, PERF_REG_POWERPC_R12), 26 SMPL_REG(r13, PERF_REG_POWERPC_R13), 27 SMPL_REG(r14, PERF_REG_POWERPC_R14), 28 SMPL_REG(r15, PERF_REG_POWERPC_R15), 29 SMPL_REG(r16, PERF_REG_POWERPC_R16), 30 SMPL_REG(r17, PERF_REG_POWERPC_R17), 31 SMPL_REG(r18, PERF_REG_POWERPC_R18), 32 SMPL_REG(r19, PERF_REG_POWERPC_R19), 33 SMPL_REG(r20, PERF_REG_POWERPC_R20), 34 SMPL_REG(r21, PERF_REG_POWERPC_R21), 35 SMPL_REG(r22, PERF_REG_POWERPC_R22), 36 SMPL_REG(r23, PERF_REG_POWERPC_R23), 37 SMPL_REG(r24, PERF_REG_POWERPC_R24), 38 SMPL_REG(r25, PERF_REG_POWERPC_R25), 39 SMPL_REG(r26, PERF_REG_POWERPC_R26), 40 SMPL_REG(r27, PERF_REG_POWERPC_R27), 41 SMPL_REG(r28, PERF_REG_POWERPC_R28), 42 SMPL_REG(r29, PERF_REG_POWERPC_R29), 43 SMPL_REG(r30, PERF_REG_POWERPC_R30), 44 SMPL_REG(r31, PERF_REG_POWERPC_R31), 45 SMPL_REG(nip, PERF_REG_POWERPC_NIP), 46 SMPL_REG(msr, PERF_REG_POWERPC_MSR), 47 SMPL_REG(orig_r3, PERF_REG_POWERPC_ORIG_R3), 48 SMPL_REG(ctr, PERF_REG_POWERPC_CTR), 49 SMPL_REG(link, PERF_REG_POWERPC_LINK), 50 SMPL_REG(xer, PERF_REG_POWERPC_XER), 51 SMPL_REG(ccr, PERF_REG_POWERPC_CCR), 52 SMPL_REG(softe, PERF_REG_POWERPC_SOFTE), 53 SMPL_REG(trap, PERF_REG_POWERPC_TRAP), 54 SMPL_REG(dar, PERF_REG_POWERPC_DAR), 55 SMPL_REG(dsisr, PERF_REG_POWERPC_DSISR), 56 SMPL_REG(sier, PERF_REG_POWERPC_SIER), 57 SMPL_REG(mmcra, PERF_REG_POWERPC_MMCRA), 58 SMPL_REG_END 59 }; 60 61 /* REG or %rREG */ 62 #define SDT_OP_REGEX1 "^(%r)?([1-2]?[0-9]|3[0-1])$" 63 64 /* -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) */ 65 #define SDT_OP_REGEX2 "^(\\-)?([0-9]+)\\((%r)?([1-2]?[0-9]|3[0-1])\\)$" 66 67 static regex_t sdt_op_regex1, sdt_op_regex2; 68 69 static int sdt_init_op_regex(void) 70 { 71 static int initialized; 72 int ret = 0; 73 74 if (initialized) 75 return 0; 76 77 ret = regcomp(&sdt_op_regex1, SDT_OP_REGEX1, REG_EXTENDED); 78 if (ret) 79 goto error; 80 81 ret = regcomp(&sdt_op_regex2, SDT_OP_REGEX2, REG_EXTENDED); 82 if (ret) 83 goto free_regex1; 84 85 initialized = 1; 86 return 0; 87 88 free_regex1: 89 regfree(&sdt_op_regex1); 90 error: 91 pr_debug4("Regex compilation error.\n"); 92 return ret; 93 } 94 95 /* 96 * Parse OP and convert it into uprobe format, which is, +/-NUM(%gprREG). 97 * Possible variants of OP are: 98 * Format Example 99 * ------------------------- 100 * NUM(REG) 48(18) 101 * -NUM(REG) -48(18) 102 * NUM(%rREG) 48(%r18) 103 * -NUM(%rREG) -48(%r18) 104 * REG 18 105 * %rREG %r18 106 * iNUM i0 107 * i-NUM i-1 108 * 109 * SDT marker arguments on Powerpc uses %rREG form with -mregnames flag 110 * and REG form with -mno-regnames. Here REG is general purpose register, 111 * which is in 0 to 31 range. 112 */ 113 int arch_sdt_arg_parse_op(char *old_op, char **new_op) 114 { 115 int ret, new_len; 116 regmatch_t rm[5]; 117 char prefix; 118 119 /* Constant argument. Uprobe does not support it */ 120 if (old_op[0] == 'i') { 121 pr_debug4("Skipping unsupported SDT argument: %s\n", old_op); 122 return SDT_ARG_SKIP; 123 } 124 125 ret = sdt_init_op_regex(); 126 if (ret < 0) 127 return ret; 128 129 if (!regexec(&sdt_op_regex1, old_op, 3, rm, 0)) { 130 /* REG or %rREG --> %gprREG */ 131 132 new_len = 5; /* % g p r NULL */ 133 new_len += (int)(rm[2].rm_eo - rm[2].rm_so); 134 135 *new_op = zalloc(new_len); 136 if (!*new_op) 137 return -ENOMEM; 138 139 scnprintf(*new_op, new_len, "%%gpr%.*s", 140 (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so); 141 } else if (!regexec(&sdt_op_regex2, old_op, 5, rm, 0)) { 142 /* 143 * -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) --> 144 * +/-NUM(%gprREG) 145 */ 146 prefix = (rm[1].rm_so == -1) ? '+' : '-'; 147 148 new_len = 8; /* +/- ( % g p r ) NULL */ 149 new_len += (int)(rm[2].rm_eo - rm[2].rm_so); 150 new_len += (int)(rm[4].rm_eo - rm[4].rm_so); 151 152 *new_op = zalloc(new_len); 153 if (!*new_op) 154 return -ENOMEM; 155 156 scnprintf(*new_op, new_len, "%c%.*s(%%gpr%.*s)", prefix, 157 (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so, 158 (int)(rm[4].rm_eo - rm[4].rm_so), old_op + rm[4].rm_so); 159 } else { 160 pr_debug4("Skipping unsupported SDT argument: %s\n", old_op); 161 return SDT_ARG_SKIP; 162 } 163 164 return SDT_ARG_VALID; 165 } 166