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| author | Alan Modra <amodra@gmail.com> | 2014-06-03 10:55:29 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2014-06-03 10:55:29 +0930 |
| commit | 397998fc32a34d3c8993ef46da45c3957a4dd402 (patch) | |
| tree | 2dba3305c8567097b13505879d970299d2b9ad08 /bfd/elf64-ppc.c | |
| parent | 61f5c66f62502f33e1f2441a043bd29bb3ad6ea5 (diff) | |
| download | gdb-397998fc32a34d3c8993ef46da45c3957a4dd402.zip gdb-397998fc32a34d3c8993ef46da45c3957a4dd402.tar.gz gdb-397998fc32a34d3c8993ef46da45c3957a4dd402.tar.bz2 | |
Support fusion for ELFv2 stubs
Power8 fuses addis,addi and addis,ld sequences when the target of the
addis is the same as the addi/ld. Thus
addis r12,r2,xxx@ha
addi r12,r12,xxx@l / ld r12,xxx@l(r12)
is faster than
addis r11,r2,xxx@ha
addi r12,r11,xxx@l / ld r12,xxx@l(r11)
So use the form that allows fusion in plt call and branch stubs.
bfd/
* elf64-ppc.c (ADDIS_R12_R2): Define.
(build_plt_stub): Support fusion on ELFv2 stub.
(ppc_build_one_stub): Likewise for plt branch stubs.
gold/
* powerpc.cc (addis_12_2): Define.
(Stub_table::do_write): Support fusion on ELFv2 stubs.
ld/testsuite/
* ld-powerpc/elfv2exe.d: Update for changed plt call stubs.
gdb/
* ppc64-tdep.c (ppc64_standard_linkage8): New.
(ppc64_skip_trampoline_code): Recognise ELFv2 stub supporting fusion.
Diffstat (limited to 'bfd/elf64-ppc.c')
| -rw-r--r-- | bfd/elf64-ppc.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c index fdca0c6..e7e2e39 100644 --- a/bfd/elf64-ppc.c +++ b/bfd/elf64-ppc.c @@ -173,6 +173,7 @@ static bfd_vma opd_entry_value #define LD_R2_0R1 0xe8410000 /* ld %r2,0(%r1) */ +#define ADDIS_R12_R2 0x3d820000 /* addis %r12,%r2,xxx@ha */ #define ADDIS_R12_R12 0x3d8c0000 /* addis %r12,%r12,xxx@ha */ #define LD_R12_0R12 0xe98c0000 /* ld %r12,xxx@l(%r12) */ @@ -10246,8 +10247,16 @@ build_plt_stub (struct ppc_link_hash_table *htab, if (ALWAYS_EMIT_R2SAVE || stub_entry->stub_type == ppc_stub_plt_call_r2save) bfd_put_32 (obfd, STD_R2_0R1 + STK_TOC (htab), p), p += 4; - bfd_put_32 (obfd, ADDIS_R11_R2 | PPC_HA (offset), p), p += 4; - bfd_put_32 (obfd, LD_R12_0R11 | PPC_LO (offset), p), p += 4; + if (plt_load_toc) + { + bfd_put_32 (obfd, ADDIS_R11_R2 | PPC_HA (offset), p), p += 4; + bfd_put_32 (obfd, LD_R12_0R11 | PPC_LO (offset), p), p += 4; + } + else + { + bfd_put_32 (obfd, ADDIS_R12_R2 | PPC_HA (offset), p), p += 4; + bfd_put_32 (obfd, LD_R12_0R12 | PPC_LO (offset), p), p += 4; + } if (plt_load_toc && PPC_HA (offset + 8 + 8 * plt_static_chain) != PPC_HA (offset)) { @@ -10668,10 +10677,10 @@ ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) { size = 16; bfd_put_32 (htab->params->stub_bfd, - ADDIS_R11_R2 | PPC_HA (off), loc); + ADDIS_R12_R2 | PPC_HA (off), loc); loc += 4; bfd_put_32 (htab->params->stub_bfd, - LD_R12_0R11 | PPC_LO (off), loc); + LD_R12_0R12 | PPC_LO (off), loc); } else { @@ -10697,10 +10706,10 @@ ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) { size += 4; bfd_put_32 (htab->params->stub_bfd, - ADDIS_R11_R2 | PPC_HA (off), loc); + ADDIS_R12_R2 | PPC_HA (off), loc); loc += 4; bfd_put_32 (htab->params->stub_bfd, - LD_R12_0R11 | PPC_LO (off), loc); + LD_R12_0R12 | PPC_LO (off), loc); } else bfd_put_32 (htab->params->stub_bfd, LD_R12_0R2 | PPC_LO (off), loc); |