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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 | // SPDX-License-Identifier: GPL-2.0 #include <errno.h> #include <string.h> #include <regex.h> #include "../../perf.h" #include "../../util/util.h" #include "../../util/perf_regs.h" #include "../../util/debug.h" const struct sample_reg sample_reg_masks[] = { SMPL_REG(r0, PERF_REG_POWERPC_R0), SMPL_REG(r1, PERF_REG_POWERPC_R1), SMPL_REG(r2, PERF_REG_POWERPC_R2), SMPL_REG(r3, PERF_REG_POWERPC_R3), SMPL_REG(r4, PERF_REG_POWERPC_R4), SMPL_REG(r5, PERF_REG_POWERPC_R5), SMPL_REG(r6, PERF_REG_POWERPC_R6), SMPL_REG(r7, PERF_REG_POWERPC_R7), SMPL_REG(r8, PERF_REG_POWERPC_R8), SMPL_REG(r9, PERF_REG_POWERPC_R9), SMPL_REG(r10, PERF_REG_POWERPC_R10), SMPL_REG(r11, PERF_REG_POWERPC_R11), SMPL_REG(r12, PERF_REG_POWERPC_R12), SMPL_REG(r13, PERF_REG_POWERPC_R13), SMPL_REG(r14, PERF_REG_POWERPC_R14), SMPL_REG(r15, PERF_REG_POWERPC_R15), SMPL_REG(r16, PERF_REG_POWERPC_R16), SMPL_REG(r17, PERF_REG_POWERPC_R17), SMPL_REG(r18, PERF_REG_POWERPC_R18), SMPL_REG(r19, PERF_REG_POWERPC_R19), SMPL_REG(r20, PERF_REG_POWERPC_R20), SMPL_REG(r21, PERF_REG_POWERPC_R21), SMPL_REG(r22, PERF_REG_POWERPC_R22), SMPL_REG(r23, PERF_REG_POWERPC_R23), SMPL_REG(r24, PERF_REG_POWERPC_R24), SMPL_REG(r25, PERF_REG_POWERPC_R25), SMPL_REG(r26, PERF_REG_POWERPC_R26), SMPL_REG(r27, PERF_REG_POWERPC_R27), SMPL_REG(r28, PERF_REG_POWERPC_R28), SMPL_REG(r29, PERF_REG_POWERPC_R29), SMPL_REG(r30, PERF_REG_POWERPC_R30), SMPL_REG(r31, PERF_REG_POWERPC_R31), SMPL_REG(nip, PERF_REG_POWERPC_NIP), SMPL_REG(msr, PERF_REG_POWERPC_MSR), SMPL_REG(orig_r3, PERF_REG_POWERPC_ORIG_R3), SMPL_REG(ctr, PERF_REG_POWERPC_CTR), SMPL_REG(link, PERF_REG_POWERPC_LINK), SMPL_REG(xer, PERF_REG_POWERPC_XER), SMPL_REG(ccr, PERF_REG_POWERPC_CCR), SMPL_REG(softe, PERF_REG_POWERPC_SOFTE), SMPL_REG(trap, PERF_REG_POWERPC_TRAP), SMPL_REG(dar, PERF_REG_POWERPC_DAR), SMPL_REG(dsisr, PERF_REG_POWERPC_DSISR), SMPL_REG(sier, PERF_REG_POWERPC_SIER), SMPL_REG(mmcra, PERF_REG_POWERPC_MMCRA), SMPL_REG_END }; /* REG or %rREG */ #define SDT_OP_REGEX1 "^(%r)?([1-2]?[0-9]|3[0-1])$" /* -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) */ #define SDT_OP_REGEX2 "^(\\-)?([0-9]+)\\((%r)?([1-2]?[0-9]|3[0-1])\\)$" 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; } /* * Parse OP and convert it into uprobe format, which is, +/-NUM(%gprREG). * Possible variants of OP are: * Format Example * ------------------------- * NUM(REG) 48(18) * -NUM(REG) -48(18) * NUM(%rREG) 48(%r18) * -NUM(%rREG) -48(%r18) * REG 18 * %rREG %r18 * iNUM i0 * i-NUM i-1 * * SDT marker arguments on Powerpc uses %rREG form with -mregnames flag * and REG form with -mno-regnames. Here REG is general purpose register, * which is in 0 to 31 range. */ int arch_sdt_arg_parse_op(char *old_op, char **new_op) { int ret, new_len; regmatch_t rm[5]; char prefix; /* Constant argument. Uprobe does not support it */ if (old_op[0] == 'i') { pr_debug4("Skipping unsupported SDT argument: %s\n", old_op); return SDT_ARG_SKIP; } ret = sdt_init_op_regex(); if (ret < 0) return ret; if (!regexec(&sdt_op_regex1, old_op, 3, rm, 0)) { /* REG or %rREG --> %gprREG */ new_len = 5; /* % g p r NULL */ new_len += (int)(rm[2].rm_eo - rm[2].rm_so); *new_op = zalloc(new_len); if (!*new_op) return -ENOMEM; scnprintf(*new_op, new_len, "%%gpr%.*s", (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so); } else if (!regexec(&sdt_op_regex2, old_op, 5, rm, 0)) { /* * -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) --> * +/-NUM(%gprREG) */ prefix = (rm[1].rm_so == -1) ? '+' : '-'; new_len = 8; /* +/- ( % g p r ) NULL */ new_len += (int)(rm[2].rm_eo - rm[2].rm_so); new_len += (int)(rm[4].rm_eo - rm[4].rm_so); *new_op = zalloc(new_len); if (!*new_op) return -ENOMEM; scnprintf(*new_op, new_len, "%c%.*s(%%gpr%.*s)", prefix, (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so, (int)(rm[4].rm_eo - rm[4].rm_so), old_op + rm[4].rm_so); } else { pr_debug4("Skipping unsupported SDT argument: %s\n", old_op); return SDT_ARG_SKIP; } return SDT_ARG_VALID; } |