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 "perf_regs.h" 8 #include "../../../util/perf_regs.h" 9 #include "../../../util/debug.h" 10 #include "../../../util/event.h" 11 #include "../../../util/header.h" 12 #include "../../../perf-sys.h" 13 #include "utils_header.h" 14 15 #include <linux/kernel.h> 16 17 #define PVR_POWER9 0x004E 18 #define PVR_POWER10 0x0080 19 20 const struct sample_reg sample_reg_masks[] = { 21 SMPL_REG(r0, PERF_REG_POWERPC_R0), 22 SMPL_REG(r1, PERF_REG_POWERPC_R1), 23 SMPL_REG(r2, PERF_REG_POWERPC_R2), 24 SMPL_REG(r3, PERF_REG_POWERPC_R3), 25 SMPL_REG(r4, PERF_REG_POWERPC_R4), 26 SMPL_REG(r5, PERF_REG_POWERPC_R5), 27 SMPL_REG(r6, PERF_REG_POWERPC_R6), 28 SMPL_REG(r7, PERF_REG_POWERPC_R7), 29 SMPL_REG(r8, PERF_REG_POWERPC_R8), 30 SMPL_REG(r9, PERF_REG_POWERPC_R9), 31 SMPL_REG(r10, PERF_REG_POWERPC_R10), 32 SMPL_REG(r11, PERF_REG_POWERPC_R11), 33 SMPL_REG(r12, PERF_REG_POWERPC_R12), 34 SMPL_REG(r13, PERF_REG_POWERPC_R13), 35 SMPL_REG(r14, PERF_REG_POWERPC_R14), 36 SMPL_REG(r15, PERF_REG_POWERPC_R15), 37 SMPL_REG(r16, PERF_REG_POWERPC_R16), 38 SMPL_REG(r17, PERF_REG_POWERPC_R17), 39 SMPL_REG(r18, PERF_REG_POWERPC_R18), 40 SMPL_REG(r19, PERF_REG_POWERPC_R19), 41 SMPL_REG(r20, PERF_REG_POWERPC_R20), 42 SMPL_REG(r21, PERF_REG_POWERPC_R21), 43 SMPL_REG(r22, PERF_REG_POWERPC_R22), 44 SMPL_REG(r23, PERF_REG_POWERPC_R23), 45 SMPL_REG(r24, PERF_REG_POWERPC_R24), 46 SMPL_REG(r25, PERF_REG_POWERPC_R25), 47 SMPL_REG(r26, PERF_REG_POWERPC_R26), 48 SMPL_REG(r27, PERF_REG_POWERPC_R27), 49 SMPL_REG(r28, PERF_REG_POWERPC_R28), 50 SMPL_REG(r29, PERF_REG_POWERPC_R29), 51 SMPL_REG(r30, PERF_REG_POWERPC_R30), 52 SMPL_REG(r31, PERF_REG_POWERPC_R31), 53 SMPL_REG(nip, PERF_REG_POWERPC_NIP), 54 SMPL_REG(msr, PERF_REG_POWERPC_MSR), 55 SMPL_REG(orig_r3, PERF_REG_POWERPC_ORIG_R3), 56 SMPL_REG(ctr, PERF_REG_POWERPC_CTR), 57 SMPL_REG(link, PERF_REG_POWERPC_LINK), 58 SMPL_REG(xer, PERF_REG_POWERPC_XER), 59 SMPL_REG(ccr, PERF_REG_POWERPC_CCR), 60 SMPL_REG(softe, PERF_REG_POWERPC_SOFTE), 61 SMPL_REG(trap, PERF_REG_POWERPC_TRAP), 62 SMPL_REG(dar, PERF_REG_POWERPC_DAR), 63 SMPL_REG(dsisr, PERF_REG_POWERPC_DSISR), 64 SMPL_REG(sier, PERF_REG_POWERPC_SIER), 65 SMPL_REG(mmcra, PERF_REG_POWERPC_MMCRA), 66 SMPL_REG(mmcr0, PERF_REG_POWERPC_MMCR0), 67 SMPL_REG(mmcr1, PERF_REG_POWERPC_MMCR1), 68 SMPL_REG(mmcr2, PERF_REG_POWERPC_MMCR2), 69 SMPL_REG(mmcr3, PERF_REG_POWERPC_MMCR3), 70 SMPL_REG(sier2, PERF_REG_POWERPC_SIER2), 71 SMPL_REG(sier3, PERF_REG_POWERPC_SIER3), 72 SMPL_REG(pmc1, PERF_REG_POWERPC_PMC1), 73 SMPL_REG(pmc2, PERF_REG_POWERPC_PMC2), 74 SMPL_REG(pmc3, PERF_REG_POWERPC_PMC3), 75 SMPL_REG(pmc4, PERF_REG_POWERPC_PMC4), 76 SMPL_REG(pmc5, PERF_REG_POWERPC_PMC5), 77 SMPL_REG(pmc6, PERF_REG_POWERPC_PMC6), 78 SMPL_REG(sdar, PERF_REG_POWERPC_SDAR), 79 SMPL_REG(siar, PERF_REG_POWERPC_SIAR), 80 SMPL_REG_END 81 }; 82 83 /* REG or %rREG */ 84 #define SDT_OP_REGEX1 "^(%r)?([1-2]?[0-9]|3[0-1])$" 85 86 /* -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) */ 87 #define SDT_OP_REGEX2 "^(\\-)?([0-9]+)\\((%r)?([1-2]?[0-9]|3[0-1])\\)$" 88 89 static regex_t sdt_op_regex1, sdt_op_regex2; 90 91 static int sdt_init_op_regex(void) 92 { 93 static int initialized; 94 int ret = 0; 95 96 if (initialized) 97 return 0; 98 99 ret = regcomp(&sdt_op_regex1, SDT_OP_REGEX1, REG_EXTENDED); 100 if (ret) 101 goto error; 102 103 ret = regcomp(&sdt_op_regex2, SDT_OP_REGEX2, REG_EXTENDED); 104 if (ret) 105 goto free_regex1; 106 107 initialized = 1; 108 return 0; 109 110 free_regex1: 111 regfree(&sdt_op_regex1); 112 error: 113 pr_debug4("Regex compilation error.\n"); 114 return ret; 115 } 116 117 /* 118 * Parse OP and convert it into uprobe format, which is, +/-NUM(%gprREG). 119 * Possible variants of OP are: 120 * Format Example 121 * ------------------------- 122 * NUM(REG) 48(18) 123 * -NUM(REG) -48(18) 124 * NUM(%rREG) 48(%r18) 125 * -NUM(%rREG) -48(%r18) 126 * REG 18 127 * %rREG %r18 128 * iNUM i0 129 * i-NUM i-1 130 * 131 * SDT marker arguments on Powerpc uses %rREG form with -mregnames flag 132 * and REG form with -mno-regnames. Here REG is general purpose register, 133 * which is in 0 to 31 range. 134 */ 135 int arch_sdt_arg_parse_op(char *old_op, char **new_op) 136 { 137 int ret, new_len; 138 regmatch_t rm[5]; 139 char prefix; 140 141 /* Constant argument. Uprobe does not support it */ 142 if (old_op[0] == 'i') { 143 pr_debug4("Skipping unsupported SDT argument: %s\n", old_op); 144 return SDT_ARG_SKIP; 145 } 146 147 ret = sdt_init_op_regex(); 148 if (ret < 0) 149 return ret; 150 151 if (!regexec(&sdt_op_regex1, old_op, 3, rm, 0)) { 152 /* REG or %rREG --> %gprREG */ 153 154 new_len = 5; /* % g p r NULL */ 155 new_len += (int)(rm[2].rm_eo - rm[2].rm_so); 156 157 *new_op = zalloc(new_len); 158 if (!*new_op) 159 return -ENOMEM; 160 161 scnprintf(*new_op, new_len, "%%gpr%.*s", 162 (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so); 163 } else if (!regexec(&sdt_op_regex2, old_op, 5, rm, 0)) { 164 /* 165 * -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) --> 166 * +/-NUM(%gprREG) 167 */ 168 prefix = (rm[1].rm_so == -1) ? '+' : '-'; 169 170 new_len = 8; /* +/- ( % g p r ) NULL */ 171 new_len += (int)(rm[2].rm_eo - rm[2].rm_so); 172 new_len += (int)(rm[4].rm_eo - rm[4].rm_so); 173 174 *new_op = zalloc(new_len); 175 if (!*new_op) 176 return -ENOMEM; 177 178 scnprintf(*new_op, new_len, "%c%.*s(%%gpr%.*s)", prefix, 179 (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so, 180 (int)(rm[4].rm_eo - rm[4].rm_so), old_op + rm[4].rm_so); 181 } else { 182 pr_debug4("Skipping unsupported SDT argument: %s\n", old_op); 183 return SDT_ARG_SKIP; 184 } 185 186 return SDT_ARG_VALID; 187 } 188 189 uint64_t arch__intr_reg_mask(void) 190 { 191 struct perf_event_attr attr = { 192 .type = PERF_TYPE_HARDWARE, 193 .config = PERF_COUNT_HW_CPU_CYCLES, 194 .sample_type = PERF_SAMPLE_REGS_INTR, 195 .precise_ip = 1, 196 .disabled = 1, 197 .exclude_kernel = 1, 198 }; 199 int fd; 200 u32 version; 201 u64 extended_mask = 0, mask = PERF_REGS_MASK; 202 203 /* 204 * Get the PVR value to set the extended 205 * mask specific to platform. 206 */ 207 version = (((mfspr(SPRN_PVR)) >> 16) & 0xFFFF); 208 if (version == PVR_POWER9) 209 extended_mask = PERF_REG_PMU_MASK_300; 210 else if (version == PVR_POWER10) 211 extended_mask = PERF_REG_PMU_MASK_31; 212 else 213 return mask; 214 215 attr.sample_regs_intr = extended_mask; 216 attr.sample_period = 1; 217 event_attr_init(&attr); 218 219 /* 220 * check if the pmu supports perf extended regs, before 221 * returning the register mask to sample. 222 */ 223 fd = sys_perf_event_open(&attr, 0, -1, -1, 0); 224 if (fd != -1) { 225 close(fd); 226 mask |= extended_mask; 227 } 228 return mask; 229 } 230 231 uint64_t arch__user_reg_mask(void) 232 { 233 return PERF_REGS_MASK; 234 } 235