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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | // SPDX-License-Identifier: GPL-2.0 #include <errno.h> #include <regex.h> #include <string.h> #include <linux/kernel.h> #include <linux/zalloc.h> #include "../../../util/debug.h" #include "../../../util/event.h" #include "../../../util/perf_regs.h" const struct sample_reg sample_reg_masks[] = { SMPL_REG(x0, PERF_REG_ARM64_X0), SMPL_REG(x1, PERF_REG_ARM64_X1), SMPL_REG(x2, PERF_REG_ARM64_X2), SMPL_REG(x3, PERF_REG_ARM64_X3), SMPL_REG(x4, PERF_REG_ARM64_X4), SMPL_REG(x5, PERF_REG_ARM64_X5), SMPL_REG(x6, PERF_REG_ARM64_X6), SMPL_REG(x7, PERF_REG_ARM64_X7), SMPL_REG(x8, PERF_REG_ARM64_X8), SMPL_REG(x9, PERF_REG_ARM64_X9), SMPL_REG(x10, PERF_REG_ARM64_X10), SMPL_REG(x11, PERF_REG_ARM64_X11), SMPL_REG(x12, PERF_REG_ARM64_X12), SMPL_REG(x13, PERF_REG_ARM64_X13), SMPL_REG(x14, PERF_REG_ARM64_X14), SMPL_REG(x15, PERF_REG_ARM64_X15), SMPL_REG(x16, PERF_REG_ARM64_X16), SMPL_REG(x17, PERF_REG_ARM64_X17), SMPL_REG(x18, PERF_REG_ARM64_X18), SMPL_REG(x19, PERF_REG_ARM64_X19), SMPL_REG(x20, PERF_REG_ARM64_X20), SMPL_REG(x21, PERF_REG_ARM64_X21), SMPL_REG(x22, PERF_REG_ARM64_X22), SMPL_REG(x23, PERF_REG_ARM64_X23), SMPL_REG(x24, PERF_REG_ARM64_X24), SMPL_REG(x25, PERF_REG_ARM64_X25), SMPL_REG(x26, PERF_REG_ARM64_X26), SMPL_REG(x27, PERF_REG_ARM64_X27), SMPL_REG(x28, PERF_REG_ARM64_X28), SMPL_REG(x29, PERF_REG_ARM64_X29), SMPL_REG(lr, PERF_REG_ARM64_LR), SMPL_REG(sp, PERF_REG_ARM64_SP), SMPL_REG(pc, PERF_REG_ARM64_PC), SMPL_REG_END }; /* %xNUM */ #define SDT_OP_REGEX1 "^(x[1-2]?[0-9]|3[0-1])$" /* [sp], [sp, NUM] */ #define SDT_OP_REGEX2 "^\\[sp(, )?([0-9]+)?\\]$" static regex_t sdt_op_regex1, sdt_op_regex2; static int sdt_init_op_regex(void) { static int initialized; int ret = 0; if (initialized) return 0; ret = regcomp(&sdt_op_regex1, SDT_OP_REGEX1, REG_EXTENDED); if (ret) goto error; ret = regcomp(&sdt_op_regex2, SDT_OP_REGEX2, REG_EXTENDED); if (ret) goto free_regex1; initialized = 1; return 0; free_regex1: regfree(&sdt_op_regex1); error: pr_debug4("Regex compilation error.\n"); return ret; } /* * SDT marker arguments on Arm64 uses %xREG or [sp, NUM], currently * support these two formats. */ int arch_sdt_arg_parse_op(char *old_op, char **new_op) { int ret, new_len; regmatch_t rm[5]; ret = sdt_init_op_regex(); if (ret < 0) return ret; if (!regexec(&sdt_op_regex1, old_op, 3, rm, 0)) { /* Extract xNUM */ new_len = 2; /* % NULL */ new_len += (int)(rm[1].rm_eo - rm[1].rm_so); *new_op = zalloc(new_len); if (!*new_op) return -ENOMEM; scnprintf(*new_op, new_len, "%%%.*s", (int)(rm[1].rm_eo - rm[1].rm_so), old_op + rm[1].rm_so); } else if (!regexec(&sdt_op_regex2, old_op, 5, rm, 0)) { /* [sp], [sp, NUM] or [sp,NUM] */ new_len = 7; /* + ( % s p ) NULL */ /* If the argument is [sp], need to fill offset '0' */ if (rm[2].rm_so == -1) new_len += 1; else new_len += (int)(rm[2].rm_eo - rm[2].rm_so); *new_op = zalloc(new_len); if (!*new_op) return -ENOMEM; if (rm[2].rm_so == -1) scnprintf(*new_op, new_len, "+0(%%sp)"); else scnprintf(*new_op, new_len, "+%.*s(%%sp)", (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so); } else { pr_debug4("Skipping unsupported SDT argument: %s\n", old_op); return SDT_ARG_SKIP; } return SDT_ARG_VALID; } |