#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/fs.h>
+#include <linux/kdb.h>
#include <linux/err.h>
#include <linux/proc_fs.h>
#include <linux/sched.h> /* for cond_resched */
#include <linux/mm.h>
#include <linux/ctype.h>
+#include <linux/slab.h>
#include <asm/sections.h>
#define all_var 0
#endif
-/* These will be re-linked against their real values during the second link stage */
+/*
+ * These will be re-linked against their real values
+ * during the second link stage.
+ */
extern const unsigned long kallsyms_addresses[] __attribute__((weak));
-extern const unsigned long kallsyms_num_syms __attribute__((weak));
extern const u8 kallsyms_names[] __attribute__((weak));
+/*
+ * Tell the compiler that the count isn't in the small data section if the arch
+ * has one (eg: FRV).
+ */
+extern const unsigned long kallsyms_num_syms
+__attribute__((weak, section(".rodata")));
+
extern const u8 kallsyms_token_table[] __attribute__((weak));
extern const u16 kallsyms_token_index[] __attribute__((weak));
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)
+ if ((addr >= (unsigned long)_stext && addr <= (unsigned long)_etext) ||
+ arch_is_kernel_text(addr))
return 1;
- return in_gate_area_no_task(addr);
+ return in_gate_area_no_mm(addr);
}
static inline int is_kernel(unsigned long addr)
{
if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
return 1;
- return in_gate_area_no_task(addr);
+ return in_gate_area_no_mm(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);
+ return is_kernel_text(addr) || is_kernel_inittext(addr);
}
-/* expand a compressed symbol data into the resulting uncompressed string,
- given the offset to where the symbol is in the compressed stream */
+/*
+ * 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;
const u8 *tptr, *data;
- /* get the compressed symbol length from the first symbol byte */
+ /* Get the compressed symbol length from the first symbol byte. */
data = &kallsyms_names[off];
len = *data;
data++;
- /* update the offset to return the offset for the next symbol on
- * the compressed stream */
+ /*
+ * Update the offset to return the offset for the next symbol on
+ * the compressed stream.
+ */
off += len + 1;
- /* for every byte on the compressed symbol data, copy the table
- entry for that byte */
- while(len) {
- tptr = &kallsyms_token_table[ kallsyms_token_index[*data] ];
+ /*
+ * For every byte on the compressed symbol data, copy the table
+ * entry for that byte.
+ */
+ while (len) {
+ tptr = &kallsyms_token_table[kallsyms_token_index[*data]];
data++;
len--;
while (*tptr) {
- if(skipped_first) {
+ if (skipped_first) {
*result = *tptr;
result++;
} else
*result = '\0';
- /* return to offset to the next symbol */
+ /* Return to offset to the next symbol. */
return off;
}
-/* get symbol type information. This is encoded as a single char at the
- * begining of the symbol name */
+/*
+ * Get symbol type information. This is encoded as a single char at the
+ * beginning of the symbol name.
+ */
static char kallsyms_get_symbol_type(unsigned int off)
{
- /* get just the first code, look it up in the token table, and return the
- * first char from this token */
- return kallsyms_token_table[ kallsyms_token_index[ kallsyms_names[off+1] ] ];
+ /*
+ * Get just the first code, look it up in the token table,
+ * and return the first char from this token.
+ */
+ return kallsyms_token_table[kallsyms_token_index[kallsyms_names[off + 1]]];
}
-/* find the offset on the compressed stream given and index in the
- * kallsyms array */
+/*
+ * Find the offset on the compressed stream given and index in the
+ * kallsyms array.
+ */
static unsigned int get_symbol_offset(unsigned long pos)
{
const u8 *name;
int i;
- /* use the closest marker we have. We have markers every 256 positions,
- * so that should be close enough */
- name = &kallsyms_names[ kallsyms_markers[pos>>8] ];
+ /*
+ * Use the closest marker we have. We have markers every 256 positions,
+ * so that should be close enough.
+ */
+ name = &kallsyms_names[kallsyms_markers[pos >> 8]];
- /* sequentially scan all the symbols up to the point we're searching for.
- * Every symbol is stored in a [<len>][<len> bytes of data] format, so we
- * just need to add the len to the current pointer for every symbol we
- * wish to skip */
- for(i = 0; i < (pos&0xFF); i++)
+ /*
+ * Sequentially scan all the symbols up to the point we're searching
+ * for. Every symbol is stored in a [<len>][<len> bytes of data] format,
+ * so we just need to add the len to the current pointer for every
+ * symbol we wish to skip.
+ */
+ for (i = 0; i < (pos & 0xFF); i++)
name = name + (*name) + 1;
return name - kallsyms_names;
/* Lookup the address for this symbol. Returns 0 if not found. */
unsigned long kallsyms_lookup_name(const char *name)
{
- char namebuf[KSYM_NAME_LEN+1];
+ char namebuf[KSYM_NAME_LEN];
unsigned long i;
unsigned int off;
}
return module_kallsyms_lookup_name(name);
}
+EXPORT_SYMBOL_GPL(kallsyms_lookup_name);
+
+int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
+ unsigned long),
+ void *data)
+{
+ char namebuf[KSYM_NAME_LEN];
+ unsigned long i;
+ unsigned int off;
+ int ret;
+
+ for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
+ off = kallsyms_expand_symbol(off, namebuf);
+ ret = fn(data, namebuf, NULL, kallsyms_addresses[i]);
+ if (ret != 0)
+ return ret;
+ }
+ return module_kallsyms_on_each_symbol(fn, data);
+}
+EXPORT_SYMBOL_GPL(kallsyms_on_each_symbol);
static unsigned long get_symbol_pos(unsigned long addr,
unsigned long *symbolsize,
/* This kernel should never had been booted. */
BUG_ON(!kallsyms_addresses);
- /* do a binary search on the sorted kallsyms_addresses array */
+ /* Do a binary search on the sorted kallsyms_addresses array. */
low = 0;
high = kallsyms_num_syms;
while (high - low > 1) {
- mid = (low + high) / 2;
+ mid = low + (high - low) / 2;
if (kallsyms_addresses[mid] <= addr)
low = mid;
else
}
/*
- * search for the first aliased symbol. Aliased
- * symbols are symbols with the same address
+ * Search for the first aliased symbol. Aliased
+ * symbols are symbols with the same address.
*/
while (low && kallsyms_addresses[low-1] == kallsyms_addresses[low])
--low;
symbol_start = kallsyms_addresses[low];
- /* Search for next non-aliased symbol */
+ /* 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];
}
}
- /* if we found no next symbol, we use the end of the section */
+ /* 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;
int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize,
unsigned long *offset)
{
+ char namebuf[KSYM_NAME_LEN];
if (is_ksym_addr(addr))
return !!get_symbol_pos(addr, symbolsize, offset);
- return !!module_address_lookup(addr, symbolsize, offset, NULL);
+ return !!module_address_lookup(addr, symbolsize, offset, NULL, namebuf);
}
/*
* 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
+ * - 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[KSYM_NAME_LEN - 1] = 0;
namebuf[0] = 0;
if (is_ksym_addr(addr)) {
pos = get_symbol_pos(addr, symbolsize, offset);
/* Grab name */
kallsyms_expand_symbol(get_symbol_offset(pos), namebuf);
- *modname = NULL;
+ if (modname)
+ *modname = NULL;
return namebuf;
}
- /* 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;
+ /* See if it's in a module. */
+ return module_address_lookup(addr, symbolsize, offset, modname,
+ namebuf);
}
int lookup_symbol_name(unsigned long addr, char *symname)
{
symname[0] = '\0';
- symname[KSYM_NAME_LEN] = '\0';
+ symname[KSYM_NAME_LEN - 1] = '\0';
if (is_ksym_addr(addr)) {
unsigned long pos;
kallsyms_expand_symbol(get_symbol_offset(pos), symname);
return 0;
}
- /* see if it's in a module */
+ /* See if it's in a module. */
return lookup_module_symbol_name(addr, symname);
}
+int lookup_symbol_attrs(unsigned long addr, unsigned long *size,
+ unsigned long *offset, char *modname, char *name)
+{
+ name[0] = '\0';
+ name[KSYM_NAME_LEN - 1] = '\0';
+
+ if (is_ksym_addr(addr)) {
+ unsigned long pos;
+
+ pos = get_symbol_pos(addr, size, offset);
+ /* Grab name */
+ kallsyms_expand_symbol(get_symbol_offset(pos), name);
+ modname[0] = '\0';
+ return 0;
+ }
+ /* See if it's in a module. */
+ return lookup_module_symbol_attrs(addr, size, offset, modname, name);
+}
+
/* Look up a kernel symbol and return it in a text buffer. */
-int sprint_symbol(char *buffer, unsigned long address)
+static int __sprint_symbol(char *buffer, unsigned long address,
+ int symbol_offset)
{
char *modname;
const char *name;
unsigned long offset, size;
- char namebuf[KSYM_NAME_LEN+1];
+ int len;
- name = kallsyms_lookup(address, &size, &offset, &modname, namebuf);
+ address += symbol_offset;
+ name = kallsyms_lookup(address, &size, &offset, &modname, buffer);
if (!name)
return sprintf(buffer, "0x%lx", address);
- else {
- if (modname)
- return sprintf(buffer, "%s+%#lx/%#lx [%s]", name, offset,
- size, modname);
- else
- return sprintf(buffer, "%s+%#lx/%#lx", name, offset, size);
- }
+
+ if (name != buffer)
+ strcpy(buffer, name);
+ len = strlen(buffer);
+ buffer += len;
+ offset -= symbol_offset;
+
+ if (modname)
+ len += sprintf(buffer, "+%#lx/%#lx [%s]", offset, size, modname);
+ else
+ len += sprintf(buffer, "+%#lx/%#lx", offset, size);
+
+ return len;
+}
+
+/**
+ * sprint_symbol - Look up a kernel symbol and return it in a text buffer
+ * @buffer: buffer to be stored
+ * @address: address to lookup
+ *
+ * This function looks up a kernel symbol with @address and stores its name,
+ * offset, size and module name to @buffer if possible. If no symbol was found,
+ * just saves its @address as is.
+ *
+ * This function returns the number of bytes stored in @buffer.
+ */
+int sprint_symbol(char *buffer, unsigned long address)
+{
+ return __sprint_symbol(buffer, address, 0);
+}
+
+EXPORT_SYMBOL_GPL(sprint_symbol);
+
+/**
+ * sprint_backtrace - Look up a backtrace symbol and return it in a text buffer
+ * @buffer: buffer to be stored
+ * @address: address to lookup
+ *
+ * This function is for stack backtrace and does the same thing as
+ * sprint_symbol() but with modified/decreased @address. If there is a
+ * tail-call to the function marked "noreturn", gcc optimized out code after
+ * the call so that the stack-saved return address could point outside of the
+ * caller. This function ensures that kallsyms will find the original caller
+ * by decreasing @address.
+ *
+ * This function returns the number of bytes stored in @buffer.
+ */
+int sprint_backtrace(char *buffer, unsigned long address)
+{
+ return __sprint_symbol(buffer, address, -1);
}
/* Look up a kernel symbol and print it to the kernel messages. */
printk(fmt, buffer);
}
+EXPORT_SYMBOL(__print_symbol);
/* To avoid using get_symbol_offset for every symbol, we carry prefix along. */
-struct kallsym_iter
-{
+struct kallsym_iter {
loff_t pos;
unsigned long value;
- unsigned int nameoff; /* If iterating in core kernel symbols */
+ unsigned int nameoff; /* If iterating in core kernel symbols. */
char type;
- char name[KSYM_NAME_LEN+1];
- char module_name[MODULE_NAME_LEN + 1];
+ char name[KSYM_NAME_LEN];
+ char module_name[MODULE_NAME_LEN];
int exported;
};
iter->pos = pos;
return get_ksymbol_mod(iter);
}
-
+
/* If we're not on the desired position, reset to new position. */
if (pos != iter->pos)
reset_iter(iter, pos);
{
struct kallsym_iter *iter = m->private;
- /* Some debugging symbols have no name. Ignore them. */
+ /* Some debugging symbols have no name. Ignore them. */
if (!iter->name[0])
return 0;
if (iter->module_name[0]) {
char type;
- /* Label it "global" if it is exported,
- * "local" if not exported. */
+ /*
+ * Label it "global" if it is exported,
+ * "local" if not exported.
+ */
type = iter->exported ? toupper(iter->type) :
tolower(iter->type);
- seq_printf(m, "%0*lx %c %s\t[%s]\n",
- (int)(2*sizeof(void*)),
- iter->value, type, iter->name, iter->module_name);
+ seq_printf(m, "%pK %c %s\t[%s]\n", (void *)iter->value,
+ type, iter->name, iter->module_name);
} else
- seq_printf(m, "%0*lx %c %s\n",
- (int)(2*sizeof(void*)),
- iter->value, iter->type, iter->name);
+ seq_printf(m, "%pK %c %s\n", (void *)iter->value,
+ iter->type, iter->name);
return 0;
}
static int kallsyms_open(struct inode *inode, struct file *file)
{
- /* We keep iterator in m->private, since normal case is to
+ /*
+ * We keep iterator in m->private, since normal case is to
* s_start from where we left off, so we avoid doing
- * using get_symbol_offset for every symbol */
+ * using get_symbol_offset for every symbol.
+ */
struct kallsym_iter *iter;
int ret;
return ret;
}
-static int kallsyms_release(struct inode *inode, struct file *file)
+#ifdef CONFIG_KGDB_KDB
+const char *kdb_walk_kallsyms(loff_t *pos)
{
- struct seq_file *m = (struct seq_file *)file->private_data;
- kfree(m->private);
- return seq_release(inode, file);
+ static struct kallsym_iter kdb_walk_kallsyms_iter;
+ if (*pos == 0) {
+ memset(&kdb_walk_kallsyms_iter, 0,
+ sizeof(kdb_walk_kallsyms_iter));
+ reset_iter(&kdb_walk_kallsyms_iter, 0);
+ }
+ while (1) {
+ if (!update_iter(&kdb_walk_kallsyms_iter, *pos))
+ return NULL;
+ ++*pos;
+ /* Some debugging symbols have no name. Ignore them. */
+ if (kdb_walk_kallsyms_iter.name[0])
+ return kdb_walk_kallsyms_iter.name;
+ }
}
+#endif /* CONFIG_KGDB_KDB */
static const struct file_operations kallsyms_operations = {
.open = kallsyms_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = kallsyms_release,
+ .release = seq_release_private,
};
static int __init kallsyms_init(void)
{
- struct proc_dir_entry *entry;
-
- entry = create_proc_entry("kallsyms", 0444, NULL);
- if (entry)
- entry->proc_fops = &kallsyms_operations;
+ proc_create("kallsyms", 0444, NULL, &kallsyms_operations);
return 0;
}
-__initcall(kallsyms_init);
-
-EXPORT_SYMBOL(__print_symbol);
-EXPORT_SYMBOL_GPL(sprint_symbol);
+device_initcall(kallsyms_init);
Code Review / linux-2.6.git / blobdiff