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riscv: Add support for HI20 PE relocations

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The PE standard allows for HI20/LOW12 relocations. Within the efi_loader
target we always know that our relocation target is 4k aligned, so we
don't need to worry about the LOW12 part.

This patch adds support for the respective relocations. With this and a
few grub patches I have cooking in parallel I'm able to run grub on RISC-V.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2018-06-05 19:20:32 +02:00
parent acaee30608
commit de452c04c3
2 changed files with 17 additions and 0 deletions
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14
lib/efi_loader/efi_image_loader.c
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@ -126,6 +126,20 @@ static efi_status_t efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel,
case IMAGE_REL_BASED_DIR64:
*x64 += (uint64_t)delta;
break;
#ifdef __riscv
case IMAGE_REL_BASED_RISCV_HI20:
*x32 = ((*x32 & 0xfffff000) + (uint32_t)delta) |
(*x32 & 0x00000fff);
break;
case IMAGE_REL_BASED_RISCV_LOW12I:
case IMAGE_REL_BASED_RISCV_LOW12S:
/* We know that we're 4k aligned */
if (delta & 0xfff) {
printf("Unsupported reloc offset\n");
return EFI_LOAD_ERROR;
}
break;
#endif
default:
printf("Unknown Relocation off %x type %x\n",
offset, type);