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#include "kvm/symbol.h"
#include "kvm/kvm.h"
#include <linux/err.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <bfd.h>
static bfd *abfd;
int symbol_init(struct kvm *kvm)
{
int ret = 0;
if (!kvm->vmlinux)
return 0;
bfd_init();
abfd = bfd_openr(kvm->vmlinux, NULL);
if (abfd == NULL) {
bfd_error_type err = bfd_get_error();
switch (err) {
case bfd_error_no_memory:
ret = -ENOMEM;
break;
case bfd_error_invalid_target:
ret = -EINVAL;
break;
default:
ret = -EFAULT;
break;
}
}
return ret;
}
late_init(symbol_init);
static asymbol *lookup(asymbol **symbols, int nr_symbols, const char *symbol_name)
{
int i, ret;
ret = -ENOENT;
for (i = 0; i < nr_symbols; i++) {
asymbol *symbol = symbols[i];
if (!strcmp(bfd_asymbol_name(symbol), symbol_name))
return symbol;
}
return ERR_PTR(ret);
}
char *symbol_lookup(struct kvm *kvm, unsigned long addr, char *sym, size_t size)
{
const char *filename;
bfd_vma sym_offset;
bfd_vma sym_start;
asection *section;
unsigned int line;
const char *func;
long symtab_size;
asymbol *symbol;
asymbol **syms;
int nr_syms, ret;
ret = -ENOENT;
if (!abfd)
goto not_found;
if (!bfd_check_format(abfd, bfd_object))
goto not_found;
symtab_size = bfd_get_symtab_upper_bound(abfd);
if (!symtab_size)
goto not_found;
ret = -ENOMEM;
syms = malloc(symtab_size);
if (!syms)
goto not_found;
nr_syms = bfd_canonicalize_symtab(abfd, syms);
ret = -ENOENT;
section = bfd_get_section_by_name(abfd, ".debug_aranges");
if (!section)
goto not_found;
if (!bfd_find_nearest_line(abfd, section, NULL, addr, &filename, &func, &line))
goto not_found;
if (!func)
goto not_found;
symbol = lookup(syms, nr_syms, func);
if (IS_ERR(symbol))
goto not_found;
sym_start = bfd_asymbol_value(symbol);
sym_offset = addr - sym_start;
snprintf(sym, size, "%s+%llx (%s:%i)", func, (long long) sym_offset, filename, line);
sym[size - 1] = '\0';
free(syms);
return sym;
not_found:
return ERR_PTR(ret);
}
int symbol_exit(struct kvm *kvm)
{
bfd_boolean ret = TRUE;
if (abfd)
ret = bfd_close(abfd);
if (ret == TRUE)
return 0;
return -EFAULT;
}
late_exit(symbol_exit);
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