The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 1 | /** |
| 2 | * @file opd_cookie.c |
| 3 | * cookie -> name cache |
| 4 | * |
| 5 | * @remark Copyright 2002, 2005 OProfile authors |
| 6 | * @remark Read the file COPYING |
| 7 | * |
| 8 | * @author John Levon |
| 9 | */ |
| 10 | |
| 11 | #include "opd_cookie.h" |
| 12 | #include "oprofiled.h" |
| 13 | #include "op_list.h" |
| 14 | #include "op_libiberty.h" |
| 15 | |
| 16 | #include <sys/syscall.h> |
| 17 | #include <unistd.h> |
| 18 | #include <limits.h> |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <errno.h> |
| 22 | |
| 23 | #ifndef __NR_lookup_dcookie |
| 24 | #if defined(__i386__) |
| 25 | #define __NR_lookup_dcookie 253 |
| 26 | #elif defined(__x86_64__) |
| 27 | #define __NR_lookup_dcookie 212 |
| 28 | #elif defined(__powerpc__) |
| 29 | #define __NR_lookup_dcookie 235 |
| 30 | #elif defined(__alpha__) |
| 31 | #define __NR_lookup_dcookie 406 |
| 32 | #elif defined(__hppa__) |
| 33 | #define __NR_lookup_dcookie 223 |
| 34 | #elif defined(__ia64__) |
| 35 | #define __NR_lookup_dcookie 1237 |
| 36 | #elif defined(__sparc__) |
| 37 | /* untested */ |
| 38 | #define __NR_lookup_dcookie 208 |
| 39 | #elif defined(__s390__) || defined (__s390x__) |
| 40 | #define __NR_lookup_dcookie 110 |
| 41 | #elif defined(__arm__) |
| 42 | #define __NR_lookup_dcookie (__NR_SYSCALL_BASE+249) |
| 43 | #elif defined(__mips__) |
| 44 | #include <sgidefs.h> |
| 45 | /* O32 */ |
| 46 | #if _MIPS_SIM == _MIPS_SIM_ABI32 |
| 47 | #define __NR_lookup_dcookie 4247 |
| 48 | /* N64 */ |
| 49 | #elif _MIPS_SIM == _MIPS_SIM_ABI64 |
| 50 | #define __NR_lookup_dcookie 5206 |
| 51 | /* N32 */ |
| 52 | #elif _MIPS_SIM == _MIPS_SIM_NABI32 |
| 53 | #define __NR_lookup_dcookie 6206 |
| 54 | #else |
| 55 | #error Unknown MIPS ABI: Dunno __NR_lookup_dcookie |
| 56 | #endif |
| 57 | #else |
| 58 | #error Please define __NR_lookup_dcookie for your architecture |
| 59 | #endif |
| 60 | #endif /* __NR_lookup_dcookie */ |
| 61 | |
| 62 | #if (defined(__powerpc__) && !defined(__powerpc64__)) || defined(__hppa__)\ |
| 63 | || (defined(__s390__) && !defined(__s390x__)) \ |
| 64 | || (defined(__mips__) && (_MIPS_SIM == _MIPS_SIM_ABI32) \ |
| 65 | && defined(__MIPSEB__)) \ |
| 66 | || (defined(__arm__) && defined(__ARM_EABI__) \ |
| 67 | && defined(__ARMEB__)) |
| 68 | static inline int lookup_dcookie(cookie_t cookie, char * buf, size_t size) |
| 69 | { |
| 70 | return syscall(__NR_lookup_dcookie, (unsigned long)(cookie >> 32), |
| 71 | (unsigned long)(cookie & 0xffffffff), buf, size); |
| 72 | } |
| 73 | #elif (defined(__mips__) && (_MIPS_SIM == _MIPS_SIM_ABI32)) \ |
| 74 | || (defined(__arm__) && defined(__ARM_EABI__)) |
| 75 | static inline int lookup_dcookie(cookie_t cookie, char * buf, size_t size) |
| 76 | { |
| 77 | return syscall(__NR_lookup_dcookie, |
| 78 | (unsigned long)(cookie & 0xffffffff), |
| 79 | (unsigned long)(cookie >> 32), buf, size); |
| 80 | } |
| 81 | #else |
| 82 | static inline int lookup_dcookie(cookie_t cookie, char * buf, size_t size) |
| 83 | { |
| 84 | return syscall(__NR_lookup_dcookie, cookie, buf, size); |
| 85 | } |
| 86 | #endif |
| 87 | |
| 88 | |
| 89 | struct cookie_entry { |
| 90 | cookie_t value; |
| 91 | char * name; |
| 92 | int ignored; |
| 93 | struct list_head list; |
| 94 | }; |
| 95 | |
| 96 | |
| 97 | #define HASH_SIZE 512 |
| 98 | #define HASH_BITS (HASH_SIZE - 1) |
| 99 | |
| 100 | static struct list_head hashes[HASH_SIZE]; |
| 101 | |
| 102 | static struct cookie_entry * create_cookie(cookie_t cookie) |
| 103 | { |
| 104 | int err; |
| 105 | struct cookie_entry * entry = xmalloc(sizeof(struct cookie_entry)); |
| 106 | |
| 107 | entry->value = cookie; |
| 108 | entry->name = xmalloc(PATH_MAX + 1); |
| 109 | |
| 110 | err = lookup_dcookie(cookie, entry->name, PATH_MAX); |
| 111 | |
| 112 | if (err < 0) { |
| 113 | fprintf(stderr, "Lookup of cookie %llx failed, errno=%d\n", |
| 114 | cookie, errno); |
| 115 | free(entry->name); |
| 116 | entry->name = NULL; |
| 117 | entry->ignored = 0; |
| 118 | } else { |
| 119 | entry->ignored = is_image_ignored(entry->name); |
| 120 | } |
| 121 | |
| 122 | return entry; |
| 123 | } |
| 124 | |
| 125 | |
| 126 | /* Cookie monster want cookie! */ |
| 127 | static unsigned long hash_cookie(cookie_t cookie) |
| 128 | { |
| 129 | return (cookie >> DCOOKIE_SHIFT) & (HASH_SIZE - 1); |
| 130 | } |
| 131 | |
| 132 | |
| 133 | char const * find_cookie(cookie_t cookie) |
| 134 | { |
| 135 | unsigned long hash = hash_cookie(cookie); |
| 136 | struct list_head * pos; |
| 137 | struct cookie_entry * entry; |
| 138 | |
| 139 | if (cookie == INVALID_COOKIE || cookie == NO_COOKIE) |
| 140 | return NULL; |
| 141 | |
| 142 | list_for_each(pos, &hashes[hash]) { |
| 143 | entry = list_entry(pos, struct cookie_entry, list); |
| 144 | if (entry->value == cookie) |
| 145 | goto out; |
| 146 | } |
| 147 | |
| 148 | /* not sure this can ever happen due to is_cookie_ignored */ |
| 149 | entry = create_cookie(cookie); |
| 150 | list_add(&entry->list, &hashes[hash]); |
| 151 | out: |
| 152 | return entry->name; |
| 153 | } |
| 154 | |
| 155 | |
| 156 | int is_cookie_ignored(cookie_t cookie) |
| 157 | { |
| 158 | unsigned long hash = hash_cookie(cookie); |
| 159 | struct list_head * pos; |
| 160 | struct cookie_entry * entry; |
| 161 | |
| 162 | if (cookie == INVALID_COOKIE || cookie == NO_COOKIE) |
| 163 | return 1; |
| 164 | |
| 165 | list_for_each(pos, &hashes[hash]) { |
| 166 | entry = list_entry(pos, struct cookie_entry, list); |
| 167 | if (entry->value == cookie) |
| 168 | goto out; |
| 169 | } |
| 170 | |
| 171 | entry = create_cookie(cookie); |
| 172 | list_add(&entry->list, &hashes[hash]); |
| 173 | out: |
| 174 | return entry->ignored; |
| 175 | } |
| 176 | |
| 177 | |
| 178 | char const * verbose_cookie(cookie_t cookie) |
| 179 | { |
| 180 | unsigned long hash = hash_cookie(cookie); |
| 181 | struct list_head * pos; |
| 182 | struct cookie_entry * entry; |
| 183 | |
| 184 | if (cookie == INVALID_COOKIE) |
| 185 | return "invalid"; |
| 186 | |
| 187 | if (cookie == NO_COOKIE) |
| 188 | return "anonymous"; |
| 189 | |
| 190 | list_for_each(pos, &hashes[hash]) { |
| 191 | entry = list_entry(pos, struct cookie_entry, list); |
| 192 | if (entry->value == cookie) { |
| 193 | if (!entry->name) |
| 194 | return "failed lookup"; |
| 195 | return entry->name; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | return "not hashed"; |
| 200 | } |
| 201 | |
| 202 | |
| 203 | void cookie_init(void) |
| 204 | { |
| 205 | size_t i; |
| 206 | |
| 207 | for (i = 0; i < HASH_SIZE; ++i) |
| 208 | list_init(&hashes[i]); |
| 209 | } |