X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=kernel%2Fkallsyms.c;h=6f294ff4f9eec46f448dd9eb30fcb0b2ed47e6dc;hb=refs%2Fheads%2Fvserver;hp=bd765adaacd6420e090a12d4ef3c83a2ebf5ea36;hpb=6a77f38946aaee1cd85eeec6cf4229b204c15071;p=linux-2.6.git diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c index bd765adaa..6f294ff4f 100644 --- a/kernel/kallsyms.c +++ b/kernel/kallsyms.c @@ -18,7 +18,9 @@ #include #include #include +#include /* for cond_resched */ #include +#include #include @@ -29,14 +31,14 @@ #endif /* These will be re-linked against their real values during the second link stage */ -extern unsigned long kallsyms_addresses[] __attribute__((weak)); -extern unsigned long kallsyms_num_syms __attribute__((weak,section("data"))); -extern u8 kallsyms_names[] __attribute__((weak)); +extern const unsigned long kallsyms_addresses[] __attribute__((weak)); +extern const unsigned long kallsyms_num_syms __attribute__((weak)); +extern const u8 kallsyms_names[] __attribute__((weak)); -extern u8 kallsyms_token_table[] __attribute__((weak)); -extern u16 kallsyms_token_index[] __attribute__((weak)); +extern const u8 kallsyms_token_table[] __attribute__((weak)); +extern const u16 kallsyms_token_index[] __attribute__((weak)); -extern unsigned long kallsyms_markers[] __attribute__((weak)); +extern const unsigned long kallsyms_markers[] __attribute__((weak)); static inline int is_kernel_inittext(unsigned long addr) { @@ -46,6 +48,14 @@ static inline int is_kernel_inittext(unsigned long addr) return 0; } +static inline int is_kernel_extratext(unsigned long addr) +{ + if (addr >= (unsigned long)_sextratext + && addr <= (unsigned long)_eextratext) + return 1; + return 0; +} + static inline int is_kernel_text(unsigned long addr) { if (addr >= (unsigned long)_stext && addr <= (unsigned long)_etext) @@ -60,12 +70,21 @@ static inline int is_kernel(unsigned long addr) return in_gate_area_no_task(addr); } +static int is_ksym_addr(unsigned long addr) +{ + if (all_var) + return is_kernel(addr); + + return is_kernel_text(addr) || is_kernel_inittext(addr) || + is_kernel_extratext(addr); +} + /* expand a compressed symbol data into the resulting uncompressed string, given the offset to where the symbol is in the compressed stream */ static unsigned int kallsyms_expand_symbol(unsigned int off, char *result) { int len, skipped_first = 0; - u8 *tptr, *data; + const u8 *tptr, *data; /* get the compressed symbol length from the first symbol byte */ data = &kallsyms_names[off]; @@ -113,7 +132,7 @@ static char kallsyms_get_symbol_type(unsigned int off) * kallsyms array */ static unsigned int get_symbol_offset(unsigned long pos) { - u8 *name; + const u8 *name; int i; /* use the closest marker we have. We have markers every 256 positions, @@ -146,65 +165,106 @@ unsigned long kallsyms_lookup_name(const char *name) return module_kallsyms_lookup_name(name); } -/* Lookup an address. modname is set to NULL if it's in the kernel. */ -const char *kallsyms_lookup(unsigned long addr, - unsigned long *symbolsize, - unsigned long *offset, - char **modname, char *namebuf) +static unsigned long get_symbol_pos(unsigned long addr, + unsigned long *symbolsize, + unsigned long *offset) { + unsigned long symbol_start = 0, symbol_end = 0; unsigned long i, low, high, mid; /* This kernel should never had been booted. */ BUG_ON(!kallsyms_addresses); - namebuf[KSYM_NAME_LEN] = 0; - namebuf[0] = 0; + /* do a binary search on the sorted kallsyms_addresses array */ + low = 0; + high = kallsyms_num_syms; + + while (high - low > 1) { + mid = (low + high) / 2; + if (kallsyms_addresses[mid] <= addr) + low = mid; + else + high = mid; + } - if ((all_var && is_kernel(addr)) || - (!all_var && (is_kernel_text(addr) || is_kernel_inittext(addr)))) { - unsigned long symbol_end=0; + /* + * search for the first aliased symbol. Aliased + * symbols are symbols with the same address + */ + while (low && kallsyms_addresses[low-1] == kallsyms_addresses[low]) + --low; - /* do a binary search on the sorted kallsyms_addresses array */ - low = 0; - high = kallsyms_num_syms; + symbol_start = kallsyms_addresses[low]; - while (high-low > 1) { - mid = (low + high) / 2; - if (kallsyms_addresses[mid] <= addr) low = mid; - else high = mid; + /* Search for next non-aliased symbol */ + for (i = low + 1; i < kallsyms_num_syms; i++) { + if (kallsyms_addresses[i] > symbol_start) { + symbol_end = kallsyms_addresses[i]; + break; } + } - /* search for the first aliased symbol. Aliased symbols are - symbols with the same address */ - while (low && kallsyms_addresses[low - 1] == kallsyms_addresses[low]) - --low; + /* if we found no next symbol, we use the end of the section */ + if (!symbol_end) { + if (is_kernel_inittext(addr)) + symbol_end = (unsigned long)_einittext; + else if (all_var) + symbol_end = (unsigned long)_end; + else + symbol_end = (unsigned long)_etext; + } - /* Grab name */ - kallsyms_expand_symbol(get_symbol_offset(low), namebuf); - - /* Search for next non-aliased symbol */ - for (i = low + 1; i < kallsyms_num_syms; i++) { - if (kallsyms_addresses[i] > kallsyms_addresses[low]) { - symbol_end = kallsyms_addresses[i]; - break; - } - } + *symbolsize = symbol_end - symbol_start; + *offset = addr - symbol_start; - /* if we found no next symbol, we use the end of the section */ - if (!symbol_end) { - if (is_kernel_inittext(addr)) - symbol_end = (unsigned long)_einittext; - else - symbol_end = all_var ? (unsigned long)_end : (unsigned long)_etext; - } + return low; +} - *symbolsize = symbol_end - kallsyms_addresses[low]; +/* + * Lookup an address but don't bother to find any names. + */ +int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize, + unsigned long *offset) +{ + if (is_ksym_addr(addr)) + return !!get_symbol_pos(addr, symbolsize, offset); + + return !!module_address_lookup(addr, symbolsize, offset, NULL); +} + +/* + * Lookup an address + * - modname is set to NULL if it's in the kernel + * - we guarantee that the returned name is valid until we reschedule even if + * it resides in a module + * - we also guarantee that modname will be valid until rescheduled + */ +const char *kallsyms_lookup(unsigned long addr, + unsigned long *symbolsize, + unsigned long *offset, + char **modname, char *namebuf) +{ + const char *msym; + + namebuf[KSYM_NAME_LEN] = 0; + namebuf[0] = 0; + + if (is_ksym_addr(addr)) { + unsigned long pos; + + pos = get_symbol_pos(addr, symbolsize, offset); + /* Grab name */ + kallsyms_expand_symbol(get_symbol_offset(pos), namebuf); *modname = NULL; - *offset = addr - kallsyms_addresses[low]; return namebuf; } - return module_address_lookup(addr, symbolsize, offset, modname); + /* see if it's in a module */ + msym = module_address_lookup(addr, symbolsize, offset, modname); + if (msym) + return strncpy(namebuf, msym, KSYM_NAME_LEN); + + return NULL; } /* Replace "%s" in format with address, or returns -errno. */ @@ -242,22 +302,18 @@ struct kallsym_iter char name[KSYM_NAME_LEN+1]; }; -/* Only label it "global" if it is exported. */ -static void upcase_if_global(struct kallsym_iter *iter) -{ - if (is_exported(iter->name, iter->owner)) - iter->type += 'A' - 'a'; -} - static int get_ksymbol_mod(struct kallsym_iter *iter) { iter->owner = module_get_kallsym(iter->pos - kallsyms_num_syms, - &iter->value, - &iter->type, iter->name); + &iter->value, &iter->type, + iter->name, sizeof(iter->name)); if (iter->owner == NULL) return 0; - upcase_if_global(iter); + /* Label it "global" if it is exported, "local" if not exported. */ + iter->type = is_exported(iter->name, iter->owner) + ? toupper(iter->type) : tolower(iter->type); + return 1; } @@ -342,7 +398,7 @@ static int s_show(struct seq_file *m, void *p) return 0; } -struct seq_operations kallsyms_op = { +static const struct seq_operations kallsyms_op = { .start = s_start, .next = s_next, .stop = s_stop, @@ -377,14 +433,14 @@ static int kallsyms_release(struct inode *inode, struct file *file) return seq_release(inode, file); } -static struct file_operations kallsyms_operations = { +static const struct file_operations kallsyms_operations = { .open = kallsyms_open, .read = seq_read, .llseek = seq_lseek, .release = kallsyms_release, }; -int __init kallsyms_init(void) +static int __init kallsyms_init(void) { struct proc_dir_entry *entry;