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Aligned vs. unaligned ppc32 relocs
- From: Alan Modra <amodra at gmail dot com>
- To: binutils at sourceware dot org
- Date: Fri, 16 Aug 2019 13:39:22 +0930
- Subject: Aligned vs. unaligned ppc32 relocs
Given R_PPC_ADDR32 or R_PPC_UADDR32 relocs, this patch generates
R_PPC_ADDR32 or R_PPC_UADDR32 dynamic relocs from either type
depending on whether r_offset is 4-byte aligned, and similarly for
R_PPC_ADDR16/R_PPC_UADDR16.
* elf32-ppc.c (ppc_elf_relocate_section): Optimize unaligned relocs.
diff --git a/bfd/elf32-ppc.c b/bfd/elf32-ppc.c
index e683590f41..78d39efe48 100644
--- a/bfd/elf32-ppc.c
+++ b/bfd/elf32-ppc.c
@@ -8157,6 +8157,14 @@ ppc_elf_relocate_section (bfd *output_bfd,
outrel.r_offset += (input_section->output_section->vma
+ input_section->output_offset);
+ /* Optimize unaligned reloc use. */
+ if ((r_type == R_PPC_ADDR32 && (outrel.r_offset & 3) != 0)
+ || (r_type == R_PPC_UADDR32 && (outrel.r_offset & 3) == 0))
+ r_type ^= R_PPC_ADDR32 ^ R_PPC_UADDR32;
+ if ((r_type == R_PPC_ADDR16 && (outrel.r_offset & 1) != 0)
+ || (r_type == R_PPC_UADDR16 && (outrel.r_offset & 1) == 0))
+ r_type ^= R_PPC_ADDR16 ^ R_PPC_UADDR16;
+
if (skip)
memset (&outrel, 0, sizeof outrel);
else if (!SYMBOL_REFERENCES_LOCAL (info, h))
--
Alan Modra
Australia Development Lab, IBM