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