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#include <stdio.h>
#include <elf.h>
#include "../../kexec.h"
#include "../../kexec-elf.h"
int machine_verify_elf_rel(struct mem_ehdr *ehdr)
{
if (ehdr->ei_data != ELFDATA2LSB) {
return 0;
}
if (ehdr->ei_class != ELFCLASS64) {
return 0;
}
if (ehdr->e_machine != EM_X86_64) {
return 0;
}
return 1;
}
static const char *reloc_name(unsigned long r_type)
{
static const char *r_name[] = {
"R_X86_64_NONE",
"R_X86_64_64",
"R_X86_64_PC32",
"R_X86_64_GOT32",
"R_X86_64_PLT32",
"R_X86_64_COPY",
"R_X86_64_GLOB_DAT",
"R_X86_64_JUMP_SLOT",
"R_X86_64_RELATIVE",
"R_X86_64_GOTPCREL",
"R_X86_64_32",
"R_X86_64_32S",
"R_X86_64_16",
"R_X86_64_PC16",
"R_X86_64_8",
"R_X86_64_PC8",
"R_X86_64_DTPMOD64",
"R_X86_64_DTPOFF64",
"R_X86_64_TPOFF64",
"R_X86_64_TLSGD",
"R_X86_64_TLSLD",
"R_X86_64_DTPOFF32",
"R_X86_64_GOTTPOFF",
"R_X86_64_TPOFF32",
};
static char buf[100];
const char *name;
if (r_type < (sizeof(r_name)/sizeof(r_name[0]))){
name = r_name[r_type];
}
else {
sprintf(buf, "R_X86_64_%lu", r_type);
name = buf;
}
return name;
}
void machine_apply_elf_rel(struct mem_ehdr *UNUSED(ehdr),
struct mem_sym *UNUSED(sym), unsigned long r_type, void *location,
unsigned long address, unsigned long value)
{
dbgprintf("%s\n", reloc_name(r_type));
switch(r_type) {
case R_X86_64_NONE:
break;
case R_X86_64_64:
*(uint64_t *)location = value;
break;
case R_X86_64_32:
*(uint32_t *)location = value;
if (value != *(uint32_t *)location)
goto overflow;
break;
case R_X86_64_32S:
*(uint32_t *)location = value;
if ((int64_t)value != *(int32_t *)location)
goto overflow;
break;
case R_X86_64_PC32:
case R_X86_64_PLT32:
*(uint32_t *)location = value - address;
break;
default:
die("Unhandled rela relocation: %s\n", reloc_name(r_type));
break;
}
return;
overflow:
die("overflow in relocation type %s val %lx\n",
reloc_name(r_type), value);
}
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