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Implement support for the RISCV PLT ELF relocs ##bin

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This commit is contained in:
pancake 2019-10-07 14:49:10 +02:00
parent c22891c9c6
commit b6d806fff7
1 changed files with 33 additions and 1 deletions
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34
libr/bin/format/elf/elf.c
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@ -17,6 +17,7 @@
#define IFINT if (0)
#define MIPS_PLT_OFFSET 108
#define RISCV_PLT_OFFSET 40
#define ELF_PAGE_MASK 0xFFFFFFFFFFFFF000LL
#define ELF_PAGE_SIZE 12
@ -1604,6 +1605,36 @@ static ut64 get_import_addr_x86(ELFOBJ *bin, struct ht_rel_t *rel, RBinElfSectio
}
}
static ut64 get_import_addr_riscv(ELFOBJ *bin, struct ht_rel_t *rel, RBinElfSection *plt_section) {
RBinElfSection *s = get_section_by_name (bin, ".rela.plt");
if (s) {
ut8 buf[1024];
const ut8 *base;
ut64 plt_addr = s->rva + s->size;
int len = r_buf_read_at (bin->b, s->offset + s->size, buf, sizeof (buf));
if (len != sizeof (buf)) {
// oops
}
base = r_mem_mem_aligned (buf, sizeof (buf), (const ut8 *)"\x3c\x0f\x00", 3, 4);
if (base) {
plt_addr += (int)(size_t) (base - buf);
} else {
plt_addr += RISCV_PLT_OFFSET; // HARDCODED HACK
}
plt_addr += rel->k * 16;
return plt_addr;
}
if (plt_section) {
const int sizeOfProcedureLinkageTable = 32;
const int sizeOfPltEntry = 16;
return plt_section->rva + sizeOfProcedureLinkageTable + (rel->k * sizeOfPltEntry);
}
eprintf ("Unsupported relocs type %" PFMT64u " for arch %d\n",
(ut64)REL_TYPE, bin->ehdr.e_machine);
return UT64_MAX;
}
static ut64 get_import_addr_mips(ELFOBJ *bin, struct ht_rel_t *rel, RBinElfSection *plt_section) {
RBinElfSection *s = get_section_by_name (bin, ".rela.plt");
if (s) {
@ -1628,7 +1659,6 @@ static ut64 get_import_addr_mips(ELFOBJ *bin, struct ht_rel_t *rel, RBinElfSecti
const int sizeOfPltEntry = 16;
return plt_section->rva + sizeOfProcedureLinkageTable + (rel->k * sizeOfPltEntry);
}
eprintf ("Unsupported relocs type %" PFMT64u " for arch %d\n",
(ut64)REL_TYPE, bin->ehdr.e_machine);
return UT64_MAX;
@ -1666,6 +1696,8 @@ static ut64 get_import_addr(ELFOBJ *bin, int sym) {
case EM_SPARCV9:
case EM_SPARC32PLUS:
return get_import_addr_sparc (bin, rel, plt_section);
case EM_RISCV:
return get_import_addr_riscv (bin, rel, plt_section);
case EM_ARM:
case EM_AARCH64:
return get_import_addr_arm (bin, rel, plt_section);