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authorAlexander Graf <agraf@suse.de>2018-06-05 19:20:32 +0200
committerAlexander Graf <agraf@suse.de>2018-06-14 10:52:14 +0200
commitde452c04c391948dbff68029e900fbb10dd5efb2 (patch)
tree9806d73ef898c5ad05b372ecc6fb6efe67b4a5f2
parentacaee30608ce203289a180d664b7f0abb2e64ee7 (diff)
riscv: Add support for HI20 PE relocations
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>
-rw-r--r--include/pe.h3
-rw-r--r--lib/efi_loader/efi_image_loader.c14
2 files changed, 17 insertions, 0 deletions
diff --git a/include/pe.h b/include/pe.h
index d73eb142cb..36e1908b7e 100644
--- a/include/pe.h
+++ b/include/pe.h
@@ -201,10 +201,13 @@ typedef struct _IMAGE_RELOCATION
#define IMAGE_REL_BASED_MIPS_JMPADDR 5
#define IMAGE_REL_BASED_ARM_MOV32A 5 /* yes, 5 too */
#define IMAGE_REL_BASED_ARM_MOV32 5 /* yes, 5 too */
+#define IMAGE_REL_BASED_RISCV_HI20 5 /* yes, 5 too */
#define IMAGE_REL_BASED_SECTION 6
#define IMAGE_REL_BASED_REL 7
#define IMAGE_REL_BASED_ARM_MOV32T 7 /* yes, 7 too */
#define IMAGE_REL_BASED_THUMB_MOV32 7 /* yes, 7 too */
+#define IMAGE_REL_BASED_RISCV_LOW12I 7 /* yes, 7 too */
+#define IMAGE_REL_BASED_RISCV_LOW12S 8
#define IMAGE_REL_BASED_MIPS_JMPADDR16 9
#define IMAGE_REL_BASED_IA64_IMM64 9 /* yes, 9 too */
#define IMAGE_REL_BASED_DIR64 10
diff --git a/lib/efi_loader/efi_image_loader.c b/lib/efi_loader/efi_image_loader.c
index 3cffe9ef46..ecdb77e5b6 100644
--- a/lib/efi_loader/efi_image_loader.c
+++ b/lib/efi_loader/efi_image_loader.c
@@ -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);