Although RISC-V Linux will enable the unaligned memory access handler by
default, that is quite expensive in general, using memcpy will be much cheaper
- just break down that into several load/store byte instructions.
ARM and MIPS has similar issue:
ARM: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51456
MIPS: https://gcc.gnu.org/legacy-ml/gcc-help/2005-07/msg00325.html
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
elf_machine_rela_relative (ElfW(Addr) l_addr, const ElfW(Rela) *reloc,
void *const reloc_addr)
{
- *(ElfW(Addr) *) reloc_addr = l_addr + reloc->r_addend;
+ /* R_RISCV_RELATIVE might located in debug info section which might not
+ aligned to XLEN bytes. Also support relocations on unaligned offsets. */
+ ElfW(Addr) value = l_addr + reloc->r_addend;
+ memcpy (reloc_addr, &value, sizeof value);
}
/* Perform a relocation described by R_INFO at the location pointed to