70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
#include <common.h>
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#include <init.h>
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#include <kallsyms.h>
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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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/* 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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/* 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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// return module_kallsyms_lookup_name(name);
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return 0;
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}
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