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* elf64-ppc.c (ppc64_elf_relocate_section): Correct branch

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prediction bits.
This commit is contained in:
Alan Modra 2001-11-01 05:35:10 +00:00
parent 070b1dd3c2
commit 86c76c7be0
2 changed files with 19 additions and 15 deletions
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5
bfd/ChangeLog
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@ -1,3 +1,8 @@
2001-11-01 Alan Modra <amodra@bigpond.net.au>
* elf64-ppc.c (ppc64_elf_relocate_section): Correct branch
prediction bits.
2001-10-31 Chris Demetriou <cgd@demetriou.com>
* elf32-mips.c (_bfd_mips_elf_hi16_reloc): Handle PC-relative

29
bfd/elf64-ppc.c
View file

@ -92,9 +92,6 @@ static boolean ppc64_elf_finish_dynamic_sections
PARAMS ((bfd *, struct bfd_link_info *));
/* Branch prediction bit for branch taken relocs. */
#define BRANCH_PREDICT_BIT 0x200000
/* Mask to set RA in memory instructions. */
#define RA_REGISTER_MASK 0x001f0000
@ -3161,6 +3158,7 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section,
}
/* First handle relocations that tweak non-addend part of insn. */
insn = 0;
switch (r_type)
{
default:
@ -3169,22 +3167,23 @@ ppc64_elf_relocate_section (output_bfd, info, input_bfd, input_section,
/* Branch taken prediction relocations. */
case R_PPC64_ADDR14_BRTAKEN:
case R_PPC64_REL14_BRTAKEN:
insn = bfd_get_32 (output_bfd, contents + offset);
if ((relocation - offset) & 0x8000)
insn &= ~BRANCH_PREDICT_BIT;
else
insn |= BRANCH_PREDICT_BIT;
bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
break;
insn = 0x01 << 21; /* Set 't' bit, lowest bit of BO field. */
/* Fall thru. */
/* Branch not taken predicition relocations. */
/* Branch not taken prediction relocations. */
case R_PPC64_ADDR14_BRNTAKEN:
case R_PPC64_REL14_BRNTAKEN:
insn = bfd_get_32 (output_bfd, contents + offset);
if ((relocation - offset) & 0x8000)
insn |= BRANCH_PREDICT_BIT;
insn |= bfd_get_32 (output_bfd, contents + offset) & ~(0x01 << 21);
/* Set 'a' bit. This is 0b00010 in BO field for branch on CR(BI)
insns (BO == 001at or 011at), and 0b01000 for branch on CTR
insns (BO == 1a00t or 1a01t). */
if ((insn & (0x14 << 21)) == (0x04 << 21))
insn |= 0x02 << 21;
else if ((insn & (0x14 << 21)) == (0x10 << 21))
insn |= 0x08 << 21;
else
insn &= ~BRANCH_PREDICT_BIT;
break;
bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
break;