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#include <stdio.h>
#include <string.h>
#include "kexec.h"
/* Retrieve kernel symbol virtual address from /proc/kallsyms */
unsigned long long get_kernel_sym(const char *symbol)
{
const char *kallsyms = "/proc/kallsyms";
char sym[128];
char line[128];
FILE *fp;
unsigned long long vaddr;
char type;
fp = fopen(kallsyms, "r");
if (!fp) {
fprintf(stderr, "Cannot open %s\n", kallsyms);
return 0;
}
while (fgets(line, sizeof(line), fp) != NULL) {
if (sscanf(line, "%llx %c %s", &vaddr, &type, sym) != 3)
continue;
if (strcmp(sym, symbol) == 0) {
dbgprintf("kernel symbol %s vaddr = %16llx\n",
symbol, vaddr);
fclose(fp);
return vaddr;
}
}
dbgprintf("Cannot get kernel %s symbol address\n", symbol);
fclose(fp);
return 0;
}
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