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| author | Alan Modra <amodra@gmail.com> | 2001-11-01 05:35:10 +0000 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2001-11-01 05:35:10 +0000 |
| commit | 86c76c7be013a7d3910c507f235afd3a2d7b9d2f (patch) | |
| tree | b897c06bb7bffc41858efc16885561d0b66e0e4f /bfd/elf64-ppc.c | |
| parent | 070b1dd3c2ef0b9eb9b6048d83b46bd81f58202b (diff) | |
| download | gdb-86c76c7be013a7d3910c507f235afd3a2d7b9d2f.zip gdb-86c76c7be013a7d3910c507f235afd3a2d7b9d2f.tar.gz gdb-86c76c7be013a7d3910c507f235afd3a2d7b9d2f.tar.bz2 | |
* elf64-ppc.c (ppc64_elf_relocate_section): Correct branch
prediction bits.
Diffstat (limited to 'bfd/elf64-ppc.c')
| -rw-r--r-- | bfd/elf64-ppc.c | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c index 59ae522..418b386 100644 --- a/bfd/elf64-ppc.c +++ b/bfd/elf64-ppc.c @@ -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; |