2007-09-28 18:29:52 +00:00
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#include <common.h>
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#include <init.h>
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#include <kallsyms.h>
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2012-10-03 14:28:36 +00:00
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#include <asm/sections.h>
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2007-09-28 18:29:52 +00:00
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/* These will be re-linked against their real values during the second link stage */
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extern const unsigned long kallsyms_addresses[] __attribute__((weak));
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extern const unsigned long kallsyms_num_syms __attribute__((weak));
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extern const u8 kallsyms_names[] __attribute__((weak));
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extern const u8 kallsyms_token_table[] __attribute__((weak));
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extern const u16 kallsyms_token_index[] __attribute__((weak));
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extern const unsigned long kallsyms_markers[] __attribute__((weak));
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2011-03-08 11:00:10 +00:00
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static inline int is_kernel_text(unsigned long addr)
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{
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if ((addr >= (unsigned long)_stext && addr <= (unsigned long)_etext))
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return 1;
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return 0;
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}
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2007-09-28 18:29:52 +00:00
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/* expand a compressed symbol data into the resulting uncompressed string,
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given the offset to where the symbol is in the compressed stream */
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static unsigned int kallsyms_expand_symbol(unsigned int off, char *result)
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{
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int len, skipped_first = 0;
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const u8 *tptr, *data;
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/* get the compressed symbol length from the first symbol byte */
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data = &kallsyms_names[off];
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len = *data;
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data++;
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/* update the offset to return the offset for the next symbol on
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* the compressed stream */
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off += len + 1;
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/* for every byte on the compressed symbol data, copy the table
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entry for that byte */
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while(len) {
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tptr = &kallsyms_token_table[ kallsyms_token_index[*data] ];
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data++;
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len--;
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while (*tptr) {
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if(skipped_first) {
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*result = *tptr;
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result++;
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} else
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skipped_first = 1;
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tptr++;
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}
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}
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*result = '\0';
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/* return to offset to the next symbol */
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return off;
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}
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2011-03-08 11:00:10 +00:00
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/*
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* Find the offset on the compressed stream given and index in the
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* kallsyms array.
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*/
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static unsigned int get_symbol_offset(unsigned long pos)
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{
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const u8 *name;
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int i;
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/*
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* Use the closest marker we have. We have markers every 256 positions,
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* so that should be close enough.
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*/
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name = &kallsyms_names[kallsyms_markers[pos >> 8]];
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/*
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* Sequentially scan all the symbols up to the point we're searching
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* for. Every symbol is stored in a [<len>][<len> bytes of data] format,
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* so we just need to add the len to the current pointer for every
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* symbol we wish to skip.
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*/
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for (i = 0; i < (pos & 0xFF); i++)
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name = name + (*name) + 1;
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return name - kallsyms_names;
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}
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2007-09-28 18:29:52 +00:00
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/* Lookup the address for this symbol. Returns 0 if not found. */
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unsigned long kallsyms_lookup_name(const char *name)
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{
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char namebuf[KSYM_NAME_LEN];
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unsigned long i;
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unsigned int off;
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for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
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off = kallsyms_expand_symbol(off, namebuf);
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if (strcmp(namebuf, name) == 0)
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return kallsyms_addresses[i];
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}
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2011-03-08 11:00:10 +00:00
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/* module kallsyms not yet supported */
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2007-09-28 18:29:52 +00:00
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return 0;
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}
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2011-03-08 11:00:10 +00:00
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static unsigned long get_symbol_pos(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset)
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{
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unsigned long symbol_start = 0, symbol_end = 0;
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unsigned long i, low, high, mid;
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/* This kernel should never had been booted. */
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BUG_ON(!kallsyms_addresses);
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/* Do a binary search on the sorted kallsyms_addresses array. */
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low = 0;
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high = kallsyms_num_syms;
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while (high - low > 1) {
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mid = low + (high - low) / 2;
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if (kallsyms_addresses[mid] <= addr)
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low = mid;
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else
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high = mid;
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}
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/*
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* Search for the first aliased symbol. Aliased
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* symbols are symbols with the same address.
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*/
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while (low && kallsyms_addresses[low-1] == kallsyms_addresses[low])
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--low;
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symbol_start = kallsyms_addresses[low];
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/* Search for next non-aliased symbol. */
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for (i = low + 1; i < kallsyms_num_syms; i++) {
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if (kallsyms_addresses[i] > symbol_start) {
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symbol_end = kallsyms_addresses[i];
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break;
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}
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}
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/* If we found no next symbol, we use the end of the section. */
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if (!symbol_end) {
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symbol_end = (unsigned long)_etext;
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}
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if (symbolsize)
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*symbolsize = symbol_end - symbol_start;
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if (offset)
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*offset = addr - symbol_start;
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return low;
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}
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/*
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* Lookup an address
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* - modname is set to NULL if it's in the kernel.
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* - We guarantee that the returned name is valid until we reschedule even if.
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* It resides in a module.
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* - We also guarantee that modname will be valid until rescheduled.
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*/
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2014-02-16 07:24:30 +00:00
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static const char *kallsyms_lookup(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset,
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char **modname, char *namebuf)
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2011-03-08 11:00:10 +00:00
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{
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namebuf[KSYM_NAME_LEN - 1] = 0;
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namebuf[0] = 0;
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if (is_kernel_text(addr)) {
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unsigned long pos;
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pos = get_symbol_pos(addr, symbolsize, offset);
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/* Grab name */
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kallsyms_expand_symbol(get_symbol_offset(pos), namebuf);
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if (modname)
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*modname = NULL;
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return namebuf;
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}
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/* moduled not yet supported in kallsyms */
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return NULL;
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}
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/* Look up a kernel symbol and return it in a text buffer. */
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int sprint_symbol(char *buffer, unsigned long address)
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{
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char *modname;
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const char *name;
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unsigned long offset, size;
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int len;
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name = kallsyms_lookup(address, &size, &offset, &modname, buffer);
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if (!name)
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return sprintf(buffer, "0x%lx", address);
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if (name != buffer)
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strcpy(buffer, name);
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len = strlen(buffer);
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buffer += len;
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if (modname)
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len += sprintf(buffer, "+%#lx/%#lx [%s]",
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offset, size, modname);
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else
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len += sprintf(buffer, "+%#lx/%#lx", offset, size);
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return len;
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}
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EXPORT_SYMBOL_GPL(sprint_symbol);
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