1 // SPDX-License-Identifier: GPL-2.0 2 #include <stdbool.h> 3 #include <stdlib.h> 4 #include <stdint.h> 5 #include <string.h> 6 #include <stdio.h> 7 #include "util/debug.h" 8 #include <dwarf-regs.h> 9 #include <subcmd/parse-options.h> 10 #include "util/perf_regs.h" 11 #include "util/parse-regs-options.h" 12 13 static void list_perf_regs(FILE *fp, uint64_t mask) 14 { 15 const char *last_name = NULL; 16 17 fprintf(fp, "available registers: "); 18 for (int reg = 0; reg < 64; reg++) { 19 const char *name; 20 21 if (((1ULL << reg) & mask) == 0) 22 continue; 23 24 name = perf_reg_name(reg, EM_HOST, EF_HOST); 25 if (name && (!last_name || strcmp(last_name, name))) 26 fprintf(fp, "%s%s", reg > 0 ? " " : "", name); 27 last_name = name; 28 } 29 fputc('\n', fp); 30 } 31 32 static uint64_t name_to_perf_reg_mask(const char *to_match, uint64_t mask) 33 { 34 uint64_t reg_mask = 0; 35 36 for (int reg = 0; reg < 64; reg++) { 37 const char *name; 38 39 if (((1ULL << reg) & mask) == 0) 40 continue; 41 42 name = perf_reg_name(reg, EM_HOST, EF_HOST); 43 if (!name) 44 continue; 45 46 if (!strcasecmp(to_match, name)) 47 reg_mask |= 1ULL << reg; 48 } 49 return reg_mask; 50 } 51 52 static int 53 __parse_regs(const struct option *opt, const char *str, int unset, bool intr) 54 { 55 uint64_t *mode = (uint64_t *)opt->value; 56 char *s, *os = NULL, *p; 57 int ret = -1; 58 uint64_t mask; 59 60 if (unset) 61 return 0; 62 63 /* 64 * cannot set it twice 65 */ 66 if (*mode) 67 return -1; 68 69 /* str may be NULL in case no arg is passed to -I */ 70 if (!str) 71 return -1; 72 73 mask = intr ? arch__intr_reg_mask() : arch__user_reg_mask(); 74 75 /* because str is read-only */ 76 s = os = strdup(str); 77 if (!s) 78 return -1; 79 80 for (;;) { 81 uint64_t reg_mask; 82 83 p = strchr(s, ','); 84 if (p) 85 *p = '\0'; 86 87 if (!strcmp(s, "?")) { 88 list_perf_regs(stderr, mask); 89 goto error; 90 } 91 92 reg_mask = name_to_perf_reg_mask(s, mask); 93 if (reg_mask == 0) { 94 ui__warning("Unknown register \"%s\", check man page or run \"perf record %s?\"\n", 95 s, intr ? "-I" : "--user-regs="); 96 goto error; 97 } 98 *mode |= reg_mask; 99 100 if (!p) 101 break; 102 103 s = p + 1; 104 } 105 ret = 0; 106 107 /* default to all possible regs */ 108 if (*mode == 0) 109 *mode = mask; 110 error: 111 free(os); 112 return ret; 113 } 114 115 int 116 parse_user_regs(const struct option *opt, const char *str, int unset) 117 { 118 return __parse_regs(opt, str, unset, false); 119 } 120 121 int 122 parse_intr_regs(const struct option *opt, const char *str, int unset) 123 { 124 return __parse_regs(opt, str, unset, true); 125 } 126