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