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Aligned vs. unaligned ppc32 relocs

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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.
This commit is contained in:
Alan Modra
2019-08-14 16:31:05 +09:30
parent d8f9e51c36
commit 63f6e94fb3
2 changed files with 12 additions and 0 deletions
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4
bfd/ChangeLog
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@ -1,3 +1,7 @@
2019-08-16 Alan Modra <amodra@gmail.com>
* elf32-ppc.c (ppc_elf_relocate_section): Optimize unaligned relocs.
2019-08-15 Jim Wilson <jimw@sifive.com> 2019-08-15 Jim Wilson <jimw@sifive.com>
* elfnn-riscv.c (perform_relocation) <R_RISCV_RVC_LUI>: If * elfnn-riscv.c (perform_relocation) <R_RISCV_RVC_LUI>: If

8
bfd/elf32-ppc.c
View File

@ -8157,6 +8157,14 @@ ppc_elf_relocate_section (bfd *output_bfd,
outrel.r_offset += (input_section->output_section->vma outrel.r_offset += (input_section->output_section->vma
+ input_section->output_offset); + 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) if (skip)
memset (&outrel, 0, sizeof outrel); memset (&outrel, 0, sizeof outrel);
else if (!SYMBOL_REFERENCES_LOCAL (info, h)) else if (!SYMBOL_REFERENCES_LOCAL (info, h))